{"id":7563,"date":"2026-10-21T11:32:37","date_gmt":"2026-10-21T11:32:37","guid":{"rendered":"https:\/\/impedyme.com\/?p=7563"},"modified":"2026-10-21T11:32:42","modified_gmt":"2026-10-21T11:32:42","slug":"synchronous-reluctance-motor","status":"publish","type":"post","link":"https:\/\/impedyme.com\/de\/resource-center\/synchronous-reluctance-motor\/","title":{"rendered":"Synchron-Reluktanzmotor (SynRM)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"7563\" class=\"elementor elementor-7563\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c61506b e-con-full elementor-hidden-desktop e-flex e-con e-parent\" data-id=\"c61506b\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-479e12a elementor-widget elementor-widget-image\" data-id=\"479e12a\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div 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knowledge<\/span><span class=\"category-item\" data-cat=\"22\">Grid<\/span><span class=\"category-item\" data-cat=\"21\">Motor<\/span><span class=\"category-item\" data-cat=\"13\">Product knowledge<\/span><span class=\"category-item\" data-cat=\"38\">Webinars<\/span><\/div><ul class=\"post-list\" data-cat=\"12\"><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/synchronous-reluctance-motor\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Synchronous Reluctance Motor (SynRM)\">Synchronous Reluctance Motor (SynRM)<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a 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alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Solid State Transformer\">Solid State Transformer<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/dc-motor-controller\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"DC Motor Controller\">DC Motor Controller<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/half-wave-rectifier\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Half Wave Rectifier\">Half Wave Rectifier<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/full-bridge-rectifier\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Full Bridge Rectifier\">Full Bridge Rectifier<\/span> \n                            <\/a> \n                          <\/li><li> \n               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Drive<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/pure-sine-wave-inverter-test\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Pure Sine Wave Inverter Test\">Pure Sine Wave Inverter Test<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/solar-inverter-test\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Solar Inverter Test\">Solar Inverter Test<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/inverter-test\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Inverter Test\">Inverter Test<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/traction-inverter-test\/\"> \n                                <span class=\"post-icon\"> \n                              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\n                                <span class=\"post-title\" title=\"Electric Aircraft HIL Testing\">Electric Aircraft HIL Testing<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/hil-testing-bms\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"HIL Testing of BMS\">HIL Testing of BMS<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/hil-testing-ev-powertrain\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Hardware in the Loop Testing for EV Powertrain\">Hardware in the Loop Testing for EV Powertrain<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/hil-testing-microgrid-renewable\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Hardware in the Loop Testing for Microgrids and Renewable Energy Systems\">Hardware in the Loop Testing for Microgrids and Re&#8230;<\/span> \n   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src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Battery Cell Testing: Standards, and Modern Test Systems\">Battery Cell Testing: Standards, and Modern Test S&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/hvdc-power-grid\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"HVDC Power Grid: How High-Voltage Direct Current Transmission\">HVDC Power Grid: How High-Voltage Direct Current T&#8230;<\/span> \n                            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src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Battery Management System Testing: Ensuring Safe, Reliable Batteries\">Battery Management System Testing: Ensuring Safe, &#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/data-center-power-stability\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"AI Data Center Power Stability: Power Capacitor Shelves, PCS Module Design\">AI Data Center Power Stability: Power Capacitor Sh&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/dc-fast-charger-for-ev\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"DC Fast Charger for EV Battery\">DC Fast Charger for EV Battery<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/powershelf-testing-data-center\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Data Center Powershelf Testing with Grid Emulator and DC Load\u200b\">Data Center Powershelf Testing with Grid Emulator &#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/derisking-hyperscale-data-center-interconnection\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"De-Risking Hyperscale Data Center Interconnections Through Simulation-First Grid Stability Planning\">De-Risking Hyperscale Data Center Interconnections&#8230;<\/span> \n                            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src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Stabilizing Renewable Power Systems and Enhancing Power Grid Stability with Grid Forming Inverters\">Stabilizing Renewable Power Systems and Enhancing &#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/webinars\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Webinars\">Webinars<\/span> \n                            <\/a> \n                          <\/li><li> \n                    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Power Hardware in the Loop (PHIL) Simulation\">Purpose and Role of Power Hardware in the Loop (PH&#8230;<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/optimizing-grid-connected-converters-for-stability\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Optimizing Grid-Connected Converters for Stability\">Optimizing Grid-Connected Converters for Stability<\/span> \n                            <\/a> \n                          <\/li><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/unlocking-insights-into-power-system-stability\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Unlocking Insights into Power System Stability\">Unlocking Insights into Power System Stability<\/span> \n                            <\/a> \n                          <\/li><\/ul><ul class=\"post-list\" data-cat=\"38\"><li> \n                            <a href=\"https:\/\/impedyme.com\/de\/resource-center\/webinars\/\"> \n                                <span class=\"post-icon\"> \n                                    <img decoding=\"async\" src=\"https:\/\/cdn-icons-png.flaticon.com\/512\/887\/887997.png\" alt=\"Impedyme Document\"> \n                                <\/span> \n                                <span class=\"post-title\" title=\"Webinars\">Webinars<\/span> \n                            <\/a> \n                          <\/li><\/ul><\/div><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4d92924 e-con-full e-flex e-con e-child\" data-id=\"4d92924\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1793840 elementor-hidden-tablet elementor-hidden-mobile elementor-widget elementor-widget-image\" data-id=\"1793840\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"464\" src=\"https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/Synchronous-Reluctance-Motor-header-1024x464.webp\" class=\"attachment-large size-large wp-image-7567\" alt=\"Synchronous Reluctance Motor header\" srcset=\"https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/Synchronous-Reluctance-Motor-header-1024x464.webp 1024w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/Synchronous-Reluctance-Motor-header-300x136.webp 300w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/Synchronous-Reluctance-Motor-header-768x348.webp 768w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/Synchronous-Reluctance-Motor-header-1536x696.webp 1536w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/Synchronous-Reluctance-Motor-header-18x8.webp 18w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/Synchronous-Reluctance-Motor-header-150x68.webp 150w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/Synchronous-Reluctance-Motor-header-480x217.webp 480w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/Synchronous-Reluctance-Motor-header.webp 2020w\" sizes=\"(max-width:767px) 480px, (max-width:1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a5674d elementor-widget elementor-widget-heading\" data-id=\"7a5674d\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">Synchronous Reluctance Motor (SynRM)<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2b8ca7b elementor-widget elementor-widget-text-editor\" data-id=\"2b8ca7b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p style=\"text-align: center;\">[custom_toc]<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d7905b2 elementor-widget elementor-widget-text-editor\" data-id=\"d7905b2\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p dir=\"ltr\"><strong>Synchronous reluctance motor (SynRM)<\/strong> is a three-phase AC machine that produces torque purely from the magnetic anisotropy of a steel rotor. It has no magnets, no cage and no rotor winding, and it turns at exactly the speed of the rotating stator field. Because the rotor carries no current, the <strong>synchronous reluctance machine<\/strong> eliminates the rotor copper loss that dominates induction-motor inefficiency. That is why the <strong>sync reluctance motor<\/strong> has become the standard magnet-free path to IE4 and IE5 efficiency in variable-speed drives, and why PM-assisted <strong>SynRM<\/strong> variants now appear in traction and compact drives. The trade-offs are just as specific: lower power factor, strongly nonlinear magnetics, no direct-on-line starting and heavy dependence on accurate rotor-angle information. This guide explains <strong>synchronous reluctance<\/strong> technology from first principles to bench validation. It covers how the <strong>AC reluctance motor<\/strong> produces reluctance torque, rotor design, control with and without sensors, and comparison with induction, PM and switched reluctance machines. It also covers how drive teams test synchronous reluctance drives, including the <a href=\"https:\/\/impedyme.com\/motor-emulator\/\">motor emulator<\/a> route.<\/p><h2 dir=\"ltr\">What is a synchronous reluctance motor?<\/h2><p dir=\"ltr\">A <strong>synchronous reluctance motor<\/strong> is a rotating-field synchronous machine whose rotor has high magnetic permeance along one axis and low permeance along the perpendicular axis, so the rotor develops torque by aligning its \u201ceasy\u201d axis with the stator field.<\/p><p dir=\"ltr\"><strong>Anatomy:<\/strong><\/p><ul dir=\"ltr\"><li><strong>Stator:<\/strong> a conventional three-phase, distributed, sinusoidally wound stator\u2014essentially an induction-motor stator.<\/li><li><strong>Rotor:<\/strong> thin electrical-steel laminations with punched air slots called <strong>flux barriers<\/strong>. Steel channels between barriers carry flux easily along the <strong>d-axis<\/strong>; barriers obstruct flux along the <strong>q-axis<\/strong>. Thin <strong>ribs<\/strong> at the periphery and radial <strong>posts<\/strong> hold the lamination together.<\/li><li><strong>Absent:<\/strong> rotor winding, squirrel cage, permanent magnets, brushes.<\/li><\/ul><p dir=\"ltr\">Because the rotor turns at synchronous speed there is <strong>zero slip<\/strong>, so there is no fundamental rotor current and virtually no rotor copper loss; only small harmonic iron loss remains.<\/p><p dir=\"ltr\"><strong>Naming:<\/strong> <em>SynRM<\/em>, <em>SynRel<\/em>, <em>sync reluctance motor<\/em>, <em>synchronous reluctance machine<\/em>, <em>reluctance synchronous machine<\/em> and <em>AC reluctance motor<\/em> describe the same machine. Switched and variable reluctance machines are <strong>relatives, not the same thing<\/strong>\u2014they use concentrated coils, pulsed unipolar currents and doubly salient rotors.<\/p><p dir=\"ltr\"><strong>Typical commercial envelope:<\/strong> industrial low-voltage SynRMs span roughly 0.75 kW to a few hundred kW (smaller series of about 0.75\u201355 kW in IEC frames 80\u2013225, larger series toward about 315 kW), mostly 4-pole at 1,500 rpm rated speed, with maximum speeds of about 3,600\u20134,500 rpm and high-speed versions to about 8,000 rpm, in 380\u2013690 V classes.<\/p><h2><span style=\"color: #000000;\">How does a synchronous reluctance motor work?<\/span><\/h2><p dir=\"ltr\">In a <strong>synchronous reluctance machine<\/strong>, the inverter-fed stator winding creates a magnetic field that rotates at a speed set by frequency and pole count. Flux prefers the low-reluctance path through iron. Because the rotor is anisotropic, any misalignment between its easy axis and the field distorts the field and stores extra energy, so the rotor is pulled toward the position of minimum reluctance. That pull is reluctance torque, the only torque-producing mechanism in a pure <strong>sync reluctance motor<\/strong>.<\/p><p><span style=\"font-weight: 400;\">Picture a <\/span><b>bar of anisotropic steel in a rotating field<\/b><span style=\"font-weight: 400;\">: it twists to line up its long axis with the field and follows at the same speed. Hold it back with a load and it lags by a <\/span><b>load angle<\/b><span style=\"font-weight: 400;\">; the lag produces useful torque, up to a maximum.<\/span><\/p><p><span style=\"font-weight: 400;\">Three consequences:<\/span><\/p><ol><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Speed is fixed by frequency and pole count alone.<\/b><span style=\"font-weight: 400;\"> A 4-pole SynRM at 50 Hz turns at 1,500 rpm at any load\u2014no slip, no droop.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Torque is commanded through the current vector<\/b><span style=\"font-weight: 400;\">\u2014its amplitude and its angle relative to the rotor d-axis. The controller chooses the combination that minimizes current, loss or voltage.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>No load means no lag and no torque.<\/b><span style=\"font-weight: 400;\"> As load rises, the load angle grows until <\/span><b>pull-out torque<\/b><span style=\"font-weight: 400;\">. Beyond it the machine does not slip gradually like an induction motor\u2014it <\/span><b>loses synchronism<\/b><span style=\"font-weight: 400;\">, torque collapses and the drive trips. Overload capability is a hard limit.<\/span><\/li><\/ol><h3><span style=\"color: #000000;\">Saliency ratio: what the d-axis and q-axis inductances really tell you<\/span><\/h3><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>d-axis inductance (Ld):<\/b><span style=\"font-weight: 400;\"> seen by current driving flux along the easy path through the steel channels\u2014high.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>q-axis inductance (Lq):<\/b><span style=\"font-weight: 400;\"> seen by current driving flux across the barriers\u2014low.<\/span><\/li><\/ul><p dir=\"ltr\">The <strong>difference<\/strong> between Ld and Lq sets torque per ampere. The ratio between them, called the saliency ratio, largely sets the power factor, torque density and constant-power speed range an <strong>AC reluctance motor<\/strong> can achieve. Staton, Miller and Wood (IEE Proceedings, 1993) described it as \u201cby far the most important parameter\u201d for power factor, torque per ampere and constant-power speed range.<\/p><p>\n<table id=\"tablepress-194\" class=\"tablepress tablepress-id-194\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Rotor type<\/th><th class=\"column-2\">Typical saliency ratio<\/th><th class=\"column-3\">Power factor (magnet-free)<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Simple salient-pole<\/td><td class=\"column-2\">about 3, rarely above 3.8<\/td><td class=\"column-3\">roughly 0.5\u20130.6<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">2-barrier industrial TLA<\/td><td class=\"column-2\">roughly 4\u20136<\/td><td class=\"column-3\">roughly 0.6\u20130.7<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Multi-barrier (3\u20135) industrial TLA<\/td><td class=\"column-2\">roughly 6\u20139<\/td><td class=\"column-3\">roughly 0.7\u20130.8<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Axially laminated \/ traction and research<\/td><td class=\"column-2\">roughly 6\u201320 (unsaturated)<\/td><td class=\"column-3\">up to about 0.8\u20130.85<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-194 from cache --><\/p><p>bands combine published ranges with typical industrial values. A recent peer-reviewed design study notes that power factor above 0.8 requires saliency above about 9, explaining why magnet-free industrial machines sit between 0.6 and 0.8.<\/p><p><b>Saliency is not a constant.<\/b><span style=\"font-weight: 400;\"> d-axis iron saturates as current rises, so Ld collapses\u2014often by half or more between light load and overload\u2014while Lq, dominated by air barriers and saturated ribs, changes much less.Saliency and power factor therefore fall with load. <\/span><b>Cross-saturation<\/b><span style=\"font-weight: 400;\"> couples the axes: q-axis current changes d-axis flux and vice versa, so the optimal current angle <\/span><b>moves with load<\/b><span style=\"font-weight: 400;\">, and fixed-inductance controllers command the wrong angle at high torque.<\/span><\/p><p><b>How Ld and Lq are measured on hardware:<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Standstill AC or step-voltage tests<\/b><span style=\"font-weight: 400;\"> along each axis, integrating voltage minus resistive drop\u2014quick, but little cross-saturation information.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Locked-rotor flux mapping<\/b><span style=\"font-weight: 400;\"> over a grid of d\/q currents, giving full self- and cross-saturation maps.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Loaded flux-linkage identification<\/b><span style=\"font-weight: 400;\"> with a speed-controlled load machine, computing flux from steady-state voltages at speed.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Standstill self-commissioning without rotor locking<\/b><span style=\"font-weight: 400;\">, published by Hinkkanen, Pellegrino, Bojoi and co-authors (IEEE Transactions on Industry Applications), the basis of modern drive self-commissioning.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Present the result as a measured family of flux-linkage curves (Figure 4), not a single inductance value.<\/span><\/p><h3><span style=\"color: #000000;\">Why a synchronous reluctance motor cannot start direct-on-line<\/span><\/h3><p dir=\"ltr\">A pure SynRM has no cage, so it gets no induction torque, and no magnets. On a fixed 50\/60 Hz supply, the field sweeps past far faster than the rotor can accelerate. The alignment torque reverses every slip cycle and averages out to zero, so the rotor vibrates and hums instead of turning. This is the defining starting limitation of every <strong>synchronous reluctance machine<\/strong> without a cage.<\/p><p><span style=\"font-weight: 400;\">The requirement is a <\/span><b><a href=\"https:\/\/impedyme.com\/variable-frequency-drive-testing\/\">VFD<\/a> with current-vector control and a known rotor position<\/b><span style=\"font-weight: 400;\">, so the field starts at zero frequency and stays locked to the rotor.The historical exception is the <\/span><b>line-start SynRM<\/b><span style=\"font-weight: 400;\"> with a partial cage; it is rare because the cage costs saliency and efficiency and synchronizes reliably only with modest inertia.<\/span><\/p><p><b>Commissioning consequence:<\/b><span style=\"font-weight: 400;\"> initial rotor-position identification is mandatory before the first torque command. A pure sync reluctance motor has\u00a0 180-electrical-degree ambiguity is harmless, but an error approaching 90 electrical degrees puts current on the wrong axis, producing a <\/span><b>reversed start, a stalled start or a violent jerk<\/b><span style=\"font-weight: 400;\">.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c2119e elementor-widget elementor-widget-image\" data-id=\"2c2119e\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/synchronous-reluctance-machine-1024x576.webp\" class=\"attachment-large size-large wp-image-7573\" alt=\"synchronous reluctance machine\" srcset=\"https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/synchronous-reluctance-machine-1024x576.webp 1024w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/synchronous-reluctance-machine-300x169.webp 300w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/synchronous-reluctance-machine-768x432.webp 768w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/synchronous-reluctance-machine-1536x864.webp 1536w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/synchronous-reluctance-machine-2048x1152.webp 2048w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/synchronous-reluctance-machine-18x10.webp 18w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/synchronous-reluctance-machine-133x75.webp 133w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/synchronous-reluctance-machine-480x270.webp 480w\" sizes=\"(max-width:767px) 480px, (max-width:1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-34f39ee elementor-widget elementor-widget-text-editor\" data-id=\"34f39ee\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2 dir=\"ltr\">Types of synchronous reluctance motors<\/h2><p dir=\"ltr\">Every <strong>synchronous reluctance machine<\/strong> can be classified along four independent axes:<\/p><ul dir=\"ltr\"><li><strong>By rotor excitation:<\/strong> pure magnet-free SynRM; PM-assisted SynRM (ferrite or small rare-earth magnets in the barriers); line-start SynRM (partial cage).<\/li><li><strong>By rotor construction:<\/strong> simple salient-pole; axially laminated anisotropic (ALA); transversally laminated anisotropic (TLA) multi-barrier\u2014the industrial standard (see construction).<\/li><li><strong>By winding and excitation:<\/strong> distributed sinusoidal synchronous machine (SynRM) versus concentrated-coil switched\/variable reluctance machine.<\/li><li><strong>By pole count and application:<\/strong> industrial IE4\/IE5 (usually 4-pole); high-speed compressor (often 2-pole, mechanically limited); traction (4\u20138 poles, usually PM-assisted); servo (low inertia, ripple-limited).<\/li><\/ul><p dir=\"ltr\">Hysteresis motors and <a href=\"https:\/\/impedyme.com\/resource-center\/stepper-motor\/\">stepper motor<\/a> or variable-reluctance motors also fall under the broad \u201creluctance motor\u201d label, but neither is a SynRM. If you searched for an <strong>AC reluctance motor<\/strong> that runs continuously from a sinusoidal three-phase supply, the synchronous reluctance types above are the ones you want.<\/p><p dir=\"ltr\">\n<table id=\"tablepress-195\" class=\"tablepress tablepress-id-195\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Type<\/th><th class=\"column-2\">Construction &amp; performance<\/th><th class=\"column-3\">Pros, cons &amp; best use<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Pure SynRM<\/td><td class=\"column-2\">TLA rotor with no magnets; inverter start only; power factor ~0.6\u20130.8<\/td><td class=\"column-3\">Pros: cheap, efficient, cool-running and magnet-free rotor. Cons: low power factor and torque ripple. Choose when: variable-speed pumps, fans and compressors need IE4\/IE5 without magnets.<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">PM-assisted SynRM<\/td><td class=\"column-2\">TLA rotor with ferrite or small NdFeB magnets; inverter start only; power factor ~0.8\u20130.9<\/td><td class=\"column-3\">Pros: higher torque density, better power factor, easier field weakening. Cons: back-EMF, demagnetization risk and higher cost. Choose when: you need traction, high-speed or compact drives.<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Line-start SynRM<\/td><td class=\"column-2\">TLA rotor with cage bars; starts direct-on-line; power factor ~0.75\u20130.82<\/td><td class=\"column-3\">Pros: needs no inverter, and IE4 is possible. Cons: pull-in is limited by load inertia. Choose when: you have fixed-speed, low-inertia loads without a drive.<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Axially laminated<\/td><td class=\"column-2\">Bent sheets in an axial stack; inverter start only; highest power factor of any magnet-free design<\/td><td class=\"column-3\">Pros: highest saliency. Cons: costly and weak at high speed. Choose when: you need research or specialist low-speed machines.<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Salient-pole<\/td><td class=\"column-2\">Rotor with cut-out poles; starts from an inverter or a cage; power factor ~0.5\u20130.6<\/td><td class=\"column-3\">Pros: very simple. Cons: low saliency and high ripple. Choose when: the machine is for teaching only.<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Switched reluctance (related machine)<\/td><td class=\"column-2\">Doubly salient rotor; needs a special converter; power factor not applicable<\/td><td class=\"column-3\">Pros: very robust. Cons: high torque ripple and noise. Choose when: you need harsh, high-temperature or high-speed drives.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-195 from cache --><\/p><h3><span style=\"color: #000000;\">PM-assisted synchronous reluctance motors (PMa-SynRM)<\/span><\/h3><p dir=\"ltr\">A PMa-SynRM places magnets in the rotor\u2019s flux barriers, magnetized to oppose q-axis flux. These are usually low-cost ferrite, sometimes small amounts of rare-earth material. The magnets cancel flux that would otherwise leak along the hard axis and through the ribs. This raises effective saliency and adds modest magnet torque to the reluctance torque the <strong>synchronous reluctance machine<\/strong> already produces.<\/p><p><b>What it buys:<\/b><span style=\"font-weight: 400;\"> higher torque density; power factor typically lifted into the <\/span><b>0.8\u20130.9 band<\/b><span style=\"font-weight: 400;\"> (a 2023 <\/span><i><span style=\"font-weight: 400;\">Applied Sciences<\/span><\/i><span style=\"font-weight: 400;\"> comparison from Xi\u2019an University of Science and Technology reported 0.8 for an optimized ferrite-assisted SynRM versus 0.97 for an interior-PM motor; another ferrite-assisted design moved a magnet-free baseline from 0.48 to 0.915) ; and a wider constant-power speed range with easier field weakening.<\/span><\/p><p><b>What it costs:<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Back-EMF at speed<\/b><span style=\"font-weight: 400;\">, even with the inverter off.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Demagnetization risk:<\/b><span style=\"font-weight: 400;\"> ferrite coercivity <\/span><i><span style=\"font-weight: 400;\">falls<\/span><\/i><span style=\"font-weight: 400;\"> at low temperature, so the worst case is a cold start with heavy flux-weakening or overload current; traction designs check ferrite at \u221240 \u00b0C.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Cogging and torque ripple<\/b><span style=\"font-weight: 400;\"> (one published ferrite-assisted design reports 11.4%).<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>More complex control:<\/b><span style=\"font-weight: 400;\"> polarity detection, temperature-dependent magnet flux, magnet-temperature-dependent MTPA tables.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>New safety handling:<\/b><span style=\"font-weight: 400;\"> after an inverter fault at speed, back-EMF can exceed the DC-link and drive <\/span><b>uncontrolled generator mode<\/b><span style=\"font-weight: 400;\"> through the diodes, requiring an <\/span><b>active short-circuit<\/b><span style=\"font-weight: 400;\"> strategy.<\/span><\/li><\/ul><p><b>Where magnet-free still wins:<\/b><span style=\"font-weight: 400;\"> a pure <strong>sync reluctance motor<\/strong> offers the lowest cost, full recyclability, no supply-chain exposure, no demagnetization mode and an intrinsically safe coast-down.<\/span><\/p><h3><span style=\"color: #000000;\">Line-start synchronous reluctance motors<\/span><\/h3><p><span style=\"font-weight: 400;\">A line-start SynRM combines a starting cage (aluminium cast into some barriers or the periphery) with a flux-barrier rotor.It accelerates asynchronously, then reluctance torque pulls it into synchronism, after which the cage carries almost no current.<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Pro:<\/b><span style=\"font-weight: 400;\"> grid-direct simplicity, no inverter; IE4 is achievable\u2014a 5.5 kW prototype reported in <\/span><i><span style=\"font-weight: 400;\">Machines<\/span><\/i><span style=\"font-weight: 400;\"> (2025, \u201cSystematic Optimization Study of Line-Start Synchronous Reluctance Motor Rotor for IE4 Efficiency\u201d) measured 92.2% at 1,200 rpm versus 90.7% at 1,175 rpm for the reference IE3 induction motor.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Con:<\/b><span style=\"font-weight: 400;\"> the cage lowers saliency (<a href=\"https:\/\/impedyme.com\/resource-center\/hil-test-pfc-converter\/\">power factor<\/a> around 0.75\u20130.82), adds start losses and inrush, and <\/span><b>pull-in is limited by load torque and inertia<\/b><span style=\"font-weight: 400;\">; every design has a \u201ccritical inertia\u201d beyond which it cannot synchronize.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">It persists in simple constant-speed, low-inertia applications and legacy retrofits.Once an inverter is present, the cage is pure penalty, so inverter-fed magnet-free designs have largely displaced it.<\/span><\/p><h2>Construction of a synchronous reluctance motor: stator, rotor and flux barriers<\/h2><p><span style=\"font-weight: 400;\">The SynRM stator is a conventional distributed three-phase winding, so existing stator tooling, insulation systems, impregnation and rewind practices apply; many manufacturers share stator stacks with induction series. <\/span><b>Essentially all synchronous reluctance machine distinctiveness lives in the rotor lamination.<\/b><\/p><p><span style=\"font-weight: 400;\">Design levers: <\/span><b>barrier count and shape<\/b><span style=\"font-weight: 400;\"> (circular, segmented, \u201cfluid\u201d); <\/span><b>rib and post widths<\/b><span style=\"font-weight: 400;\"> (thin to saturate and limit q-axis leakage, thick enough for centrifugal stress); <\/span><b>air-gap length<\/b><span style=\"font-weight: 400;\">; <\/span><b>pole count<\/b><span style=\"font-weight: 400;\"> (4 industrial, 2 very high speed, 6\u20138 traction); <\/span><b>skew<\/b><span style=\"font-weight: 400;\"> (often one slot pitch or stepped); and <\/span><b>mechanical integrity at speed<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p dir=\"ltr\">The magnet-free rotor runs markedly cooler than a cage rotor. Du, Zhang, Li and Hu\u2019s same-volume comparison in <em>Applied Sciences<\/em> (2023) found the SynRM rotor core \u201cabout 40 \u00b0C lower than that of the IM,\u201d and its stator core about 10 \u00b0C cooler. At equal winding temperature, Boglietti, Cavagnino, Pastorelli and Vagati at Politecnico di Torino (IEEE IAS 2005) measured 10% to 25% more torque from a SynRM than from the corresponding induction motor. A 2.2\/4 kW comparison by the same group found about 10\u201315%. The flux barriers also remove rotor mass, so a <strong>sync reluctance motor<\/strong> has lower inertia, which helps dynamic loads accelerate. A cooler rotor also extends bearing grease life and reduces insulation stress.<\/p><h3><span style=\"color: #000000;\">Rotor geometries compared: salient-pole, axially laminated and transversally laminated<\/span><\/h3><p><b>Simple salient-pole rotors<\/b><span style=\"font-weight: 400;\"> remove iron between poles. They are cheap but have low saliency (rarely above about 3.8) and high ripple\u2014mostly historical or for teaching.<\/span><\/p><p><b>Axially laminated anisotropic (ALA) rotors<\/b><span style=\"font-weight: 400;\">, introduced by Cruickshank, Menzies and Anderson (Proceedings of the IEE, 1966), stack bent U\/V steel sheets with insulating spacers. They achieve the <\/span><b>highest saliency<\/b><span style=\"font-weight: 400;\"> (unsaturated 6\u201320) and <\/span><b>lowest harmonic content<\/b><span style=\"font-weight: 400;\">, but are costly, awkward to manufacture, suffer eddy losses from slot harmonics, and are <\/span><b>weak at high peripheral speed<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><b>Transversally laminated anisotropic (TLA) rotors<\/b><span style=\"font-weight: 400;\"> use punched multi-barrier laminations stacked like an induction rotor. Saliency is somewhat lower than ALA, but they are <\/span><b>made on standard stamping lines<\/b><span style=\"font-weight: 400;\">, skewable and mechanically integral\u2014the <\/span><b>industrial standard<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><b>Barrier counts and ripple:<\/b><span style=\"font-weight: 400;\"> industrial TLA rotors use <\/span><b>2\u20135 barriers per pole<\/b><span style=\"font-weight: 400;\">. Ripple falls with <\/span><b>rotor skew<\/b><span style=\"font-weight: 400;\"> (often one stator slot pitch, or stepped) and <\/span><b>barrier-end shaping<\/b><span style=\"font-weight: 400;\">\u2014choosing or making asymmetric the barrier-end positions so slot harmonics cancel. Published asymmetric-end optimizations reach mid-teens percent ripple unskewed; with skew, single digits are achievable.<\/span><\/p><p><b>Speed limit:<\/b><span style=\"font-weight: 400;\"> at high speed flux guides hang off thin ribs and posts, and stress concentrates at rib corners.<\/span><\/p><p><b>Rule of thumb:<\/b><span style=\"font-weight: 400;\"> high volume, up to a few hundred kW, standard speeds \u2192 TLA with 3\u20134 barriers per pole; very high speed \u2192 TLA with fewer, wider posts, 2-pole, or dual-phase\/sleeved rotors; low volume, maximum saliency, modest speed \u2192 ALA; teaching \u2192 salient-pole.<\/span><\/p><h3 dir=\"ltr\"><span style=\"color: #000000;\">Flux barriers, ribs and saturation in a synchronous reluctance machine: the real design trade-off<\/span><\/h3><p dir=\"ltr\">More and wider barriers raise saliency and torque. The catch is that the thin ribs and posts holding the rotor together also carry flux. They saturate and leak q-axis flux, which caps the gain. Thicker ribs are mechanically safer but magnetically worse, so every <strong>AC reluctance motor<\/strong> rotor is a compromise between the two.<\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Barrier angle and end position:<\/b><span style=\"font-weight: 400;\"> choosing where barriers meet the air gap relative to slot pitch\u2014following design rules developed by Vagati and colleagues\u2014lets slot harmonics cancel, tuning ripple in the lamination rather than in software.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Air gap:<\/b><span style=\"font-weight: 400;\"> small gaps raise Ld (torque, power factor) but increase slot harmonics, iron loss and eccentricity sensitivity.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Steel grade:<\/b><span style=\"font-weight: 400;\"> thin, high-grade non-oriented steel cuts iron loss and gives a sharp saturation knee that keeps ribs saturated at low flux.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Dual-phase or locally heat-treated laminations:<\/b><span style=\"font-weight: 400;\"> ribs and posts are made <\/span><b>non-magnetic<\/b><span style=\"font-weight: 400;\"> (e.g., by nitriding) while flux guides stay magnetic, keeping mechanical continuity without a magnetic bridge.The cost is lower saturation flux density\u2014published dual-phase work reports about <\/span><b>1.5 T<\/b><span style=\"font-weight: 400;\">, versus roughly <\/span><b>1.9\u20132.0 T<\/b><span style=\"font-weight: 400;\"> for conventional non-oriented silicon steel. In a US Department of Energy non-rare-earth traction program, a dual-phase SynRM reached specific power comparable to dysprosium-free rare-earth designs. Non-magnetic titanium radial ribs are another published route.<\/span><\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6cba593 elementor-widget elementor-widget-image\" data-id=\"6cba593\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/sync-reluctance-motor-1024x576.png\" class=\"attachment-large size-large wp-image-7571\" alt=\"sync reluctance motor\" srcset=\"https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/sync-reluctance-motor-1024x576.png 1024w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/sync-reluctance-motor-300x169.png 300w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/sync-reluctance-motor-768x432.png 768w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/sync-reluctance-motor-1536x864.png 1536w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/sync-reluctance-motor-2048x1152.png 2048w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/sync-reluctance-motor-18x10.png 18w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/sync-reluctance-motor-133x75.png 133w, https:\/\/impedyme.com\/wp-content\/uploads\/2026\/10\/sync-reluctance-motor-480x270.png 480w\" sizes=\"(max-width:767px) 480px, (max-width:1024px) 100vw, 1024px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a097398 elementor-widget elementor-widget-text-editor\" data-id=\"a097398\" data-element_type=\"widget\" id=\"faraday-law\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><span style=\"color: #000000;\">Synchronous reluctance motor vs induction, PM synchronous and switched reluctance\u00a0<\/span><\/h2><p>\n<table id=\"tablepress-196\" class=\"tablepress tablepress-id-196\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Attribute<\/th><th class=\"column-2\">SynRM<\/th><th class=\"column-3\">Induction \/ PM synchronous \/ Switched reluctance<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Rotor<\/td><td class=\"column-2\">Steel with flux barriers<\/td><td class=\"column-3\">IM: steel with cage \u00b7 PMSM: steel with magnets \u00b7 SRM: doubly salient steel<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Magnets<\/td><td class=\"column-2\">None (PM-assisted: ferrite or small NdFeB)<\/td><td class=\"column-3\">IM: none \u00b7 PMSM: yes, usually NdFeB \u00b7 SRM: none<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Rotor losses<\/td><td class=\"column-2\">Very low<\/td><td class=\"column-3\">IM: high (slip-driven rotor copper loss) \u00b7 PMSM: low \u00b7 SRM: moderate<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Speed<\/td><td class=\"column-2\">Synchronous<\/td><td class=\"column-3\">IM: 1\u20135% slip \u00b7 PMSM: synchronous \u00b7 SRM: synchronous with switching<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Efficiency class<\/td><td class=\"column-2\">IE4\u2013IE5 with inverter<\/td><td class=\"column-3\">IM: IE2\u2013IE4 \u00b7 PMSM: IE4\u2013IE5+ \u00b7 SRM: ~IE3\u2013IE4<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Power factor<\/td><td class=\"column-2\">~0.6\u20130.8 (PM-assisted 0.8\u20130.9)<\/td><td class=\"column-3\">IM: ~0.8\u20130.88 \u00b7 PMSM: ~0.9\u20130.97 \u00b7 SRM: n\/a (pulsed)<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">Torque density<\/td><td class=\"column-2\">Moderate (\u2265 induction)<\/td><td class=\"column-3\">IM: moderate \u00b7 PMSM: highest \u00b7 SRM: moderate-high<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">Torque ripple \/ noise<\/td><td class=\"column-2\">Moderate \/ low-moderate<\/td><td class=\"column-3\">IM: low \/ low \u00b7 PMSM: low-moderate \/ low \u00b7 SRM: high \/ high<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">Direct-on-line start<\/td><td class=\"column-2\">No (line-start variant only)<\/td><td class=\"column-3\">IM: yes \u00b7 PMSM: no (line-start variant only) \u00b7 SRM: no<\/td>\n<\/tr>\n<tr class=\"row-11\">\n\t<td class=\"column-1\">Converter<\/td><td class=\"column-2\">Standard 3-phase VSI<\/td><td class=\"column-3\">IM: VSI or grid \u00b7 PMSM: standard VSI \u00b7 SRM: asymmetric half-bridge<\/td>\n<\/tr>\n<tr class=\"row-12\">\n\t<td class=\"column-1\">Back-EMF when coasting<\/td><td class=\"column-2\">None<\/td><td class=\"column-3\">IM: decays quickly \u00b7 PMSM: yes (a fault-case risk) \u00b7 SRM: none<\/td>\n<\/tr>\n<tr class=\"row-13\">\n\t<td class=\"column-1\">Control complexity<\/td><td class=\"column-2\">High (saturation)<\/td><td class=\"column-3\">IM: moderate \u00b7 PMSM: moderate-high \u00b7 SRM: high<\/td>\n<\/tr>\n<tr class=\"row-14\">\n\t<td class=\"column-1\">Rotor temperature<\/td><td class=\"column-2\">Lowest<\/td><td class=\"column-3\">IM: highest \u00b7 PMSM: low, but magnets are temperature-sensitive \u00b7 SRM: moderate<\/td>\n<\/tr>\n<tr class=\"row-15\">\n\t<td class=\"column-1\">Raw-material risk<\/td><td class=\"column-2\">Lowest<\/td><td class=\"column-3\">IM: low \u00b7 PMSM: rare-earth exposure \u00b7 SRM: lowest<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-196 from cache --><\/p><p><b>Interpretation.<\/b><span style=\"font-weight: 400;\"> The SynRM beats the induction motor on efficiency\u2014no rotor current, cooler rotor, no slip; Lappeenranta University of Technology researchers measured a rated-point advantage of over 2 percentage points, larger at low speed and high load. It loses on power factor and therefore inverter current rating. It approaches PMSM efficiency, especially at part load where PM machines carry magnet-driven iron loss regardless of torque, but it needs more current for the same torque and has no magnet torque at low current. It is quieter and smoother than a switched reluctance machine, at the price of a sinusoidal three-phase inverter rather than a unipolar converter.\u00a0<\/span><\/p><p><b>Comparing motors alone misleads\u2014compare motor plus inverter plus cable.<\/b><span style=\"font-weight: 400;\"> Lower power factor means more kVA for the same kW.<\/span><\/p><p><b>Worked example (arithmetic only).<\/b><span style=\"font-weight: 400;\"> A 75 kW pump at 400 V, motor efficiency 95%, needs about 78.9 kW electrical input.<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">At PF 0.85 (typical induction): 78.9 \u00f7 0.85 \u2248 92.9 kVA, about 134 A.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">At PF 0.70 (typical magnet-free SynRM): 78.9 \u00f7 0.70 \u2248 112.8 kVA, about 163 A.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Uplift: about 20 kVA and 29 A\u2014roughly <\/span><b>21% more inverter current<\/b><span style=\"font-weight: 400;\"> for the same shaft power, often one inverter frame size up unless PM assistance or drive headroom is used.<\/span><\/li><\/ul><h3><span style=\"color: #000000;\">How is a synchronous reluctance motor different from a switched reluctance motor?<\/span><\/h3><p>\n<table id=\"tablepress-197\" class=\"tablepress tablepress-id-197\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Point<\/th><th class=\"column-2\">Synchronous reluctance<\/th><th class=\"column-3\">Switched reluctance<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Winding<\/td><td class=\"column-2\">Distributed, sinusoidal three-phase<\/td><td class=\"column-3\">Concentrated coils on salient poles<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Field<\/td><td class=\"column-2\">Smooth rotating field, sinusoidal currents<\/td><td class=\"column-3\">Pulsed unipolar phase excitation<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Converter<\/td><td class=\"column-2\">Standard three-phase VSI<\/td><td class=\"column-3\">Asymmetric half-bridge per phase<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Motion<\/td><td class=\"column-2\">Continuous synchronous rotation<\/td><td class=\"column-3\">Stepped pole-to-pole commutation<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Ripple and noise<\/td><td class=\"column-2\">Moderate; skew and barrier design<\/td><td class=\"column-3\">High; dominant drawback<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Genuine uses<\/td><td class=\"column-2\">IE4\/IE5 pumps, fans, compressors; PM-assisted traction<\/td><td class=\"column-3\">Harsh, high-temperature or high-speed robust drives<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-197 from cache --><\/p><p><span style=\"font-weight: 400;\">Variable reluctance and stepping motors belong to the switched family, stepping pole to pole for positioning rather than continuous power.<\/span><\/p><h2><span style=\"color: #000000;\">Advantages and limitations of synchronous reluctance motors<\/span><\/h2><p dir=\"ltr\">A <strong>synchronous reluctance motor<\/strong> trades a magnet-free, low-loss rotor for a more demanding drive. Each point below carries an engineering consequence.<\/p><p><b>Advantages<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>No magnets:<\/b><span style=\"font-weight: 400;\"> lower cost, recyclability, no rare-earth exposure, no demagnetization.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>No cage losses:<\/b><span style=\"font-weight: 400;\"> rotor tens of kelvin cooler (about 40 \u00b0C in Du et al.\u2019s 2023 <\/span><i><span style=\"font-weight: 400;\">Applied Sciences<\/span><\/i><span style=\"font-weight: 400;\"> same-volume comparison) , extending bearing and insulation life or allowing higher rating per frame.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>IE4\/IE5 efficiency<\/b><span style=\"font-weight: 400;\"> in standard IEC frames, often frame-compatible for retrofit.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Strong part-load efficiency:<\/b><span style=\"font-weight: 400;\"> a 2019 <\/span><i><span style=\"font-weight: 400;\">Energies<\/span><\/i><span style=\"font-weight: 400;\"> study from Istanbul Technical University measured a 2.2 kW SynRM at 85% at 25% load versus 72.7% for the induction reference (88.9% versus 86.3% at full load).<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Low inertia<\/b><span style=\"font-weight: 400;\"> for faster acceleration.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Good short-term overload<\/b><span style=\"font-weight: 400;\">, with torque per ampere independent of rotor temperature.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Simple, robust rotor.<\/b><\/li><li><strong>No back-EMF<\/strong> when de-energized: a coasting <strong>sync reluctance motor<\/strong> cannot drive fault current or energize its terminals.<\/li><\/ul><p><b>Limitations<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Power factor 0.6\u20130.8<\/b><span style=\"font-weight: 400;\"> (magnet-free <strong>synchronous reluctance machine<\/strong> ), raising inverter kVA and cable current.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Higher ripple than a PMSM<\/b><span style=\"font-weight: 400;\">, requiring skew, barrier tuning or harmonic injection.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Nonlinear saturation and cross-coupling<\/b><span style=\"font-weight: 400;\"> that break constant-parameter control.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>No direct-on-line start.<\/b><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Constrained constant-power range<\/b><span style=\"font-weight: 400;\"> without PM assistance.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Thin-rib mechanical limits<\/b><span style=\"font-weight: 400;\"> at high speed.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Sensitivity to rotor-position accuracy.<\/b><\/li><\/ul><p><b>Choose a SynRM when:<\/b><span style=\"font-weight: 400;\"> the load is variable-speed with many part-load hours; IE4\/IE5 is required without magnets; rotor temperature or bearing life drives reliability; an inverter is already present; safe coast-down matters.<\/span><\/p><p><b>Avoid it (or go PM-assisted) when:<\/b><span style=\"font-weight: 400;\"> the inverter cannot be upsized; constant-power range above roughly 3:1 is required; extreme torque density or very low ripple is required; high-inertia direct-on-line starting is needed; peripheral speed would force ribs too thick for useful saliency.<\/span><\/p><h2><span style=\"color: #000000;\">How are synchronous reluctance motors controlled?<\/span><\/h2><p dir=\"ltr\">Because a <strong>synchronous reluctance<\/strong> rotor has no magnet flux and strongly nonlinear magnetics, almost all of its performance is set by the control strategy.<\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Field-oriented current-vector control:<\/b><span style=\"font-weight: 400;\"> phase currents are transformed into the rotor frame using the rotor angle, and fast loops regulate d- and q-axis current; torque is set by current magnitude and angle.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Maximum torque per ampere (MTPA):<\/b><span style=\"font-weight: 400;\"> each torque has one current angle needing the least current. In a linear machine it would sit near 45 electrical degrees; in a real SynRM, saturation and cross-saturation push it <\/span><b>upward with load<\/b><span style=\"font-weight: 400;\">, often beyond 55\u201360 degrees at overload.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Look-up-table\/flux-map control:<\/b><span style=\"font-weight: 400;\"> drives store d- and q-axis flux linkage as functions of both currents, from FEA or bench data, and pre-compute MTPA, voltage-limit and torque tables\u2014the key step from textbook to production drive.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>MTPV and field weakening:<\/b><span style=\"font-weight: 400;\"> above base speed the controller moves along the voltage limit, reducing d-axis flux, and at top speed follows\u00a0<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>maximum torque per volt<\/b><span style=\"font-weight: 400;\">. A pure SynRM has little flux to trade, so its constant-power range is narrower than a PM machine\u2019s.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Direct torque control \/ direct flux vector control:<\/b><span style=\"font-weight: 400;\"> regulates stator flux and torque directly; less dependent on inductance values but still needs saturation-aware flux estimation.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Loss-minimizing and maximum-power-factor operation:<\/b><span style=\"font-weight: 400;\"> at light load, reducing flux cuts iron loss; maximum-power-factor operation minimizes inverter kVA. Published work shows maximum-efficiency trajectories retain much of the saliency-limited power factor.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Torque-ripple mitigation:<\/b><span style=\"font-weight: 400;\"> first in the lamination (barrier ends, skew), then by <\/span><b>current harmonic injection<\/b><span style=\"font-weight: 400;\"> cancelling dominant harmonics (typically 6th and 12th orders plus slot orders).<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Rotor-angle accuracy:<\/b><span style=\"font-weight: 400;\"> In an <strong>AC reluctance motor<\/strong>, an angle error misplaces the whole current vector. A 2025 sensitivity study in <\/span><i><span style=\"font-weight: 400;\">Mathematics<\/span><\/i><span style=\"font-weight: 400;\"> found that staying within about <\/span><b>\u00b13 electrical degrees<\/b><span style=\"font-weight: 400;\"> of the MTPA trajectory limits torque or loss penalty to about 1%, with saturation narrowing the allowable band by up to 25%; the penalty grows rapidly beyond, on the order of several percent at 10 electrical degrees.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Current-loop bandwidth and switching frequency:<\/b><span style=\"font-weight: 400;\"> low Lq means fast q-axis current and larger switching ripple. Industrial drives switch at about 4\u201316 kHz with current-loop bandwidth roughly a tenth of the sampling rate; gains should be scheduled because incremental inductance may halve between light load and overload .<\/span><\/li><\/ul><p><b>Commissioning sequence:<\/b><\/p><ol><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Parameter identification: stator resistance, inverter dead-time\/voltage-error compensation.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Initial angle detection before any torque command.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Flux-map calibration: standstill self-commissioning or loaded mapping.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">MTPA table validation against a <a href=\"https:\/\/impedyme.com\/dynamometer-testbench\">torque transducer<\/a> at several loads.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Speed-loop tuning with actual load inertia.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Field-weakening and current-limit checks at maximum speed and minimum DC-link voltage.<\/span><\/li><\/ol><h3><span style=\"color: #000000;\">Sensorless control and low-speed position estimation<\/span><\/h3><p dir=\"ltr\">The inherent saliency of a <strong>synchronous reluctance machine<\/strong> gives a strong position signature: the inductance seen by the inverter varies with rotor angle, even at standstill.<\/p><p><b>Implementation:<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Medium\/high speed:<\/b><span style=\"font-weight: 400;\"> back-EMF or flux observers (including \u201cactive flux\u201d methods).<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Low speed\/standstill:<\/b> <b>high-frequency or pulse injection<\/b><span style=\"font-weight: 400;\">, tracking angle from the current response to a small test voltage.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Polarity and initial angle:<\/b><span style=\"font-weight: 400;\"> irrelevant ambiguity for pure SynRM; PMa-SynRM polarity must be resolved, typically by a saturation test.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Blended hand-over:<\/b><span style=\"font-weight: 400;\"> estimates are weighted across a speed band for smooth transition.<\/span><\/li><\/ul><p><b>Pitfalls:<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Cross-saturation biases the estimated angle<\/b><span style=\"font-weight: 400;\"> under load; Guglielmi, Pastorelli and Vagati showed injection estimates converge to a load-dependent wrong angle unless compensated with flux maps.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Saturation shrinks the saliency<\/b><span style=\"font-weight: 400;\"> injection relies on; at heavy overload the signal can weaken or vanish.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Audible injection noise<\/b><span style=\"font-weight: 400;\">, reduced by random or variable-angle injection and higher injection frequency.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Estimate loss under fast torque transients or near zero current.<\/b><\/li><\/ul><p><b>Encoder or resolver remains mandatory<\/b><span style=\"font-weight: 400;\"> for lifting and hoisting (full torque at zero speed), precise positioning, high-dynamic traction, and functional-safety functions relying on verified speed or position.<\/span><\/p><h2><span style=\"color: #000000;\">Efficiency classes, standards and energy savings (IE4 and IE5)<\/span><\/h2><p dir=\"ltr\">The <strong>synchronous reluctance motor<\/strong> is the common magnet-free route to IE4 and IE5. It removes the rotor loss that limits induction motors without the cost and supply exposure of magnets.<\/p><p><b>Standards:<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>IEC 60034-30-1:<\/b><span style=\"font-weight: 400;\"> IE classes for line-operated motors; the 2025 edition adds IE5 limits.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>IEC TS 60034-30-2:<\/b><span style=\"font-weight: 400;\"> IE classes for variable-speed motors not designed for direct-on-line operation, including SynRMs; its limits account for added harmonic losses on converter supply (15% more losses up to 90 kW, 25% above).<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>IEC 60034-2-1 \/ IEC 60034-2-3:<\/b><span style=\"font-weight: 400;\"> loss determination for line-operated and converter-fed machines.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>IEC 61800-9-2:<\/b><span style=\"font-weight: 400;\"> efficiency classes for the power drive system (IES0\u2013IES2) and converter, with standardized part-load points.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Regulation (EU) 2019\/1781<\/b><span style=\"font-weight: 400;\"> requires losses at specified load points in the EU.<\/span><\/li><\/ul><p><b>Rate the package, not the motor.<\/b><span style=\"font-weight: 400;\"> A sync reluctance motor cannot run without its inverter, so efficiency is meaningful only as a <\/span><b>power drive system<\/b><span style=\"font-weight: 400;\"> figure or a motor figure on a defined converter supply. Every quoted efficiency must state <\/span><b>test method<\/b><span style=\"font-weight: 400;\">, <\/span><b>supply<\/b><span style=\"font-weight: 400;\"> (switching frequency) and <\/span><b>whether inverter losses are included<\/b><span style=\"font-weight: 400;\">. The converter may also show slightly higher loss driving a SynRM because of the higher current.<\/span><\/p><p><b>Realistic savings:<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Full load:<\/b><span style=\"font-weight: 400;\"> about <\/span><b>1\u20133 percentage points<\/b><span style=\"font-weight: 400;\"> over an equivalent IE3 induction motor on inverter supply.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Part load:<\/b><span style=\"font-weight: 400;\"> the gap widens; published pump-system studies report SynRM configurations outperforming induction by <\/span><b>up to 7 percentage points at low loads<\/b><span style=\"font-weight: 400;\">, and a chiller-system study reported 2.53\u20134.63% energy savings across load profiles.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Payback:<\/b><span style=\"font-weight: 400;\"> 2 points on a 75 kW pump running 6,000 h\/year saves about 75 \u00d7 0.02 \u00d7 6,000 \u2248 9,000 kWh\/year\u2014often enough to recover an IE5 SynRM premium over IE3 within one to three years. More part-load hours mean faster payback.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Caveat:<\/b><span style=\"font-weight: 400;\"> hydraulic and aerodynamic losses dominate system efficiency, so a several-point motor gain may become about one point at system level, as published pump case studies show. Model the whole system.<\/span><\/li><\/ul><h2><span style=\"color: #000000;\">Applications of synchronous reluctance motors across industries<\/span><\/h2><p dir=\"ltr\">Each entry gives the reason a <strong>synchronous reluctance machine<\/strong> fits, the variant used, the main caveat and the test it implies.<\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Pumps, fans, compressors and HVAC:<\/b><span style=\"font-weight: 400;\"> part-load duty and continuous running suit pure 4-pole IE4\/IE5 SynRMs, often retrofitted into existing frames; caveat\u2014inverter sizing for power factor. <\/span><i><span style=\"font-weight: 400;\">Test:<\/span><\/i><span style=\"font-weight: 400;\"> part-load efficiency at IEC 61800-9-2 points and long-duration thermal behaviour.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Water and wastewater:<\/b><span style=\"font-weight: 400;\"> 24\/7 variable-flow duty where energy dominates life-cycle cost; cool rotor helps bearings; usually sensorless. Caveat\u2014long cables amplify kVA and reflected-wave effects. <\/span><i><span style=\"font-weight: 400;\">Test:<\/span><\/i><span style=\"font-weight: 400;\"> sensorless start under head and restart after power loss.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b><a href=\"https:\/\/impedyme.com\/electromobility\">Automotive traction and e-axles<\/a>:<\/b><span style=\"font-weight: 400;\"> usually PM-assisted for magnet-cost and thermal reasons; a DOE program targeting 55 kW peak and 30 kW continuous over 2,800\u201314,000 rpm found conventional SynRMs lagged in power density and constant-power range. <\/span><i><span style=\"font-weight: 400;\">Test:<\/span><\/i><span style=\"font-weight: 400;\"> drive-cycle efficiency maps, deep field weakening, active short-circuit and uncontrolled generation.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Commercial and off-highway vehicles:<\/b><span style=\"font-weight: 400;\"> robust high torque at moderate speed; pure or PM-assisted with encoders; severe overload and thermal cycling. <\/span><i><span style=\"font-weight: 400;\">Test:<\/span><\/i><span style=\"font-weight: 400;\"> repeated overload cycles and pull-out margin at minimum DC-link voltage.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Aerospace and more-<a href=\"https:\/\/impedyme.com\/electric-aircraft-systems\/\">electric aircraft<\/a> (fuel pumps, ECS fans, actuation):<\/b><span style=\"font-weight: 400;\"> no magnet back-EMF in winding faults and high rotor-temperature tolerance; a 2025 NASA study quantified SynRM versus PM drivetrain trade-offs for electric aircraft, and SynRMs have been patented for flap actuation at about 5 kW and below. Caveat\u2014power-to-weight penalty. <\/span><i><span style=\"font-weight: 400;\">Test:<\/span><\/i><span style=\"font-weight: 400;\"> fault-tolerant operation, phase loss, high-ambient endurance.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Machine-tool spindles:<\/b><span style=\"font-weight: 400;\"> cool rotor limits thermal growth; low inertia; high-speed TLA with reinforced ribs. <\/span><i><span style=\"font-weight: 400;\">Test:<\/span><\/i><span style=\"font-weight: 400;\"> overspeed proof and field-weakening behaviour.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Robotics and servo axes:<\/b><span style=\"font-weight: 400;\"> low inertia and overload, but torque ripple is the limiter. <\/span><i><span style=\"font-weight: 400;\">Test:<\/span><\/i><span style=\"font-weight: 400;\"> low-speed smoothness and encoder-based accuracy.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b><a href=\"https:\/\/impedyme.com\/wind-energy-conversion-system\/\">Renewables<\/a> and generator mode:<\/b><span style=\"font-weight: 400;\"> robust magnet-free generators and regenerative braking; pure SynRM generators need inverter-supplied magnetization, so PM assistance is common. <\/span><i><span style=\"font-weight: 400;\">Test:<\/span><\/i><span style=\"font-weight: 400;\"> four-quadrant operation and DC-link behaviour in regeneration.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Refrigeration compressors:<\/b><span style=\"font-weight: 400;\"> hermetic variable-speed duty, often ferrite-assisted. <\/span><i><span style=\"font-weight: 400;\">Test:<\/span><\/i><span style=\"font-weight: 400;\"> loaded sensorless starts against pressure and low-temperature demagnetization.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Teaching and research benches:<\/b><span style=\"font-weight: 400;\"> clean demonstration of reluctance torque, saturation and sensorless control; constant-inductance textbook models mislead. <\/span><i><span style=\"font-weight: 400;\">Test:<\/span><\/i><span style=\"font-weight: 400;\"> flux-map identification and controller comparison on a common platform.<\/span><\/li><\/ul><h2><span style=\"color: #000000;\">Designing and simulating a SynRM: the FEA workflow<\/span><\/h2><p dir=\"ltr\">Designing a <strong>synchronous reluctance<\/strong> rotor is an iterative loop:<\/p><ol><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Specification:<\/b><span style=\"font-weight: 400;\"> rated\/peak torque, base and maximum speed, DC-link range, thermal class, efficiency, power factor and NVH targets.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Pole and slot selection<\/b><span style=\"font-weight: 400;\">, so barrier ends interact favourably with slot pitch.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Initial barrier layout:<\/b><span style=\"font-weight: 400;\"> count, shape family, barrier-to-iron insulation ratio.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Parametric\/optimization sweep<\/b><span style=\"font-weight: 400;\"> of barrier widths, angles, ribs and air gap, trading torque, ripple and power factor.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>2D magnetostatic FEA<\/b><span style=\"font-weight: 400;\"> for flux maps over the d\/q current plane, saliency and MTPA locus.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Transient FEA<\/b><span style=\"font-weight: 400;\"> for ripple, harmonic iron loss and current harmonics with realistic inverter waveforms.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Iron-loss and demagnetization checks<\/b><span style=\"font-weight: 400;\"> for PM-assisted variants, including cold worst cases.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Mechanical stress check<\/b><span style=\"font-weight: 400;\"> of ribs and posts at maximum and overspeed.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Thermal and NVH checks<\/b><span style=\"font-weight: 400;\">, including radial force harmonics.<\/span><\/li><\/ol><p><b>What matters downstream:<\/b><span style=\"font-weight: 400;\"> the saturation and cross-saturation flux maps. The same data feeds the controller\u2019s MTPA and field-weakening tables, sensorless compensation, and the real-time model on the test bench. Treat the flux map as a versioned, validated deliverable shared by the design, controls and validation teams on every <strong>AC reluctance motor<\/strong> project.<\/span><\/p><h2><span style=\"color: #000000;\">Testing and validating a synchronous reluctance motor and its drive<\/span><\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-83952d7 elementor-widget elementor-widget-text-editor\" data-id=\"83952d7\" data-element_type=\"widget\" id=\"rotating-magnetic-field\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>\n<table id=\"tablepress-198\" class=\"tablepress tablepress-id-198\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Test<\/th><th class=\"column-2\">What it proves<\/th><th class=\"column-3\">Instrumentation demands<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Standstill identification and flux mapping<\/td><td class=\"column-2\">Magnetic model<\/td><td class=\"column-3\">Phase-aligned V\/I measurement; inverter voltage-error compensation; locked\/free rotor fixture<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">No-load and loaded efficiency mapping<\/td><td class=\"column-2\">IE class, part load<\/td><td class=\"column-3\">Power analyzer with low-PF accuracy and PWM bandwidth; torque transducer class ~0.05\u20130.1% FS; speed encoder<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Pull-out and overload<\/td><td class=\"column-2\">Hard torque limit<\/td><td class=\"column-3\">Torque transducer headroom; fast current capture<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Ripple and NVH<\/td><td class=\"column-2\">Ripple, vibration, noise<\/td><td class=\"column-3\">High-bandwidth torque sensing, accelerometers, microphones; stiff coupling<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Thermal endurance<\/td><td class=\"column-2\">Winding and rotor temperature<\/td><td class=\"column-3\">RTDs\/thermocouples; rotor telemetry or infrared<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Sensorless at zero\/low speed<\/td><td class=\"column-2\">Loaded start, angle accuracy<\/td><td class=\"column-3\">Encoder or resolver as reference<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">Field weakening and voltage limit<\/td><td class=\"column-2\">Constant-power range, MTPV<\/td><td class=\"column-3\">DC-link control; high-speed dynamometer<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">Fault cases<\/td><td class=\"column-2\">Trip, phase loss, overspeed; PMa uncontrolled generation<\/td><td class=\"column-3\">DC-link overvoltage capture; protection timing<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-198 from cache --><\/p><p><b>Why low power factor makes SynRM efficiency easy to get wrong.<\/b><span style=\"font-weight: 400;\"> Active power depends on the cosine of the voltage-current phase angle; when that angle is large, a small phase or timing error changes measured power far more than at unity power factor. The European EMPIR MICEV metrology project (Metrology for Inductive Charging of Electric Vehicles) showed that a 2-degree phase error at 100 kHz, with a 45-degree phase shift between voltage and current, already gives a <\/span><b>3.5% active-power error<\/b><span style=\"font-weight: 400;\">\u2014a wireless-charging measurement rather than a motor test, but the same trigonometry applies to motor benches. At light-load power factor near 0.2, even 0.1 degree produces close to 1% input-power error\u2014enough to move a motor across an IE class boundary. Rules: use an analyzer specified for <\/span><b>low-power-factor accuracy<\/b><span style=\"font-weight: 400;\"> and PWM bandwidth; use current sensors with known phase response and apply <\/span><b>phase\/deskew correction<\/b><span style=\"font-weight: 400;\">; keep probes phase-aligned to a small fraction of a degree; measure input and output on one synchronized instrument.\u00a0<\/span><\/p><p><b>Two bench options:<\/b><span style=\"font-weight: 400;\"> a <\/span><b>dynamometer<\/b><span style=\"font-weight: 400;\"> couples the real motor to a load machine; a <\/span><b>real-time motor emulator<\/b><span style=\"font-weight: 400;\">, implemented by <\/span><b><a href=\"https:\/\/impedyme.com\/powerhardware-in-the-loop\/\">power hardware in the loop<\/a> (PHIL) motor emulator equipment<\/b><span style=\"font-weight: 400;\">, replaces the motor with a controlled converter that behaves like the machine at the <a href=\"https:\/\/impedyme.com\/resource-center\/inverter-test\/\">inverter test<\/a> terminals.<\/span><\/p><h3><span style=\"color: #000000;\">Motor emulator vs dynamometer for SynRM drive testing<\/span><\/h3><p><b>Dynamometer:<\/b><span style=\"font-weight: 400;\"> needs the physical machine, coupling, load machine and test cell; measures <\/span><b>real<\/b><span style=\"font-weight: 400;\"> losses, torque and thermal behaviour; <\/span><b>does not exist before the prototype<\/b><span style=\"font-weight: 400;\">; slow to reconfigure; mechanically bandwidth-limited; <\/span><b>risky for fault and overspeed work<\/b><span style=\"font-weight: 400;\">.<\/span><\/p><p><b>Power-HIL motor emulator:<\/b><span style=\"font-weight: 400;\"> a controlled converter drives the device-under-test inverter\u2019s terminals according to a <\/span><b>real-time synchronous reluctance model<\/b><span style=\"font-weight: 400;\">, so inverter hardware and firmware are exercised <\/span><b>before any rotor is cut<\/b><span style=\"font-weight: 400;\">, <\/span><b>many motor variants are tested in a day<\/b><span style=\"font-weight: 400;\"> by swapping flux maps, <\/span><b>destructive fault and overspeed cases<\/b><span style=\"font-weight: 400;\"> run safely and repeatably, and <\/span><b>every internal state<\/b><span style=\"font-weight: 400;\">\u2014flux, torque, rotor angle, estimator error\u2014is observable.<\/span><\/p><p><b>What the emulator route demands:<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Model fidelity<\/b><span style=\"font-weight: 400;\"> with saturation and cross-coupling (flux-map based), ideally with spatial harmonics.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Accurate position and flux feedback timing<\/b><span style=\"font-weight: 400;\">, with emulated encoder\/resolver signals consistent with the model angle.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Converter bandwidth and dv\/dt capability<\/b><span style=\"font-weight: 400;\"> at the emulated terminals. Published research emulators show the scale: a Karlsruhe Institute of Technology multilevel PHIL converter reached PWM frequencies up to 120 kHz at more than 100 kW, and a 17-level hybrid-converter bench reported an effective 1 MHz switching frequency.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Low model-loop latency:<\/b><span style=\"font-weight: 400;\"> published <a href=\"https:\/\/impedyme.com\/fpga-scope\/\">FPGA<\/a> machine models use 667 ns time steps (1.5 MHz) or faster, industrial emulators update models at up to 3.125 MHz, and FEA-based signal-level HIL reports about 1.3 \u00b5s total latency.Impedyme CHP Series figures for emulator bandwidth, dv\/dt and latency:<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Use the emulator to de-risk firmware,\u00a0 <a href=\"https:\/\/impedyme.com\/hil-protection\/\">HIL protection<\/a> and sensorless algorithms early and to cover fault cases safely; use the dynamometer to certify efficiency, thermal performance and NVH on the final machine.<\/span><\/p><h3><span style=\"color: #000000;\">Modeling saliency, saturation and cross-coupling in real time<\/span><\/h3><p><b>Why constant-inductance models mislead for an AC reluctance motor :<\/b><span style=\"font-weight: 400;\"> saliency <\/span><b>collapses with saturation<\/b><span style=\"font-weight: 400;\">, overstating torque per ampere at high load; <\/span><b>cross-saturation shifts the torque angle<\/b><span style=\"font-weight: 400;\">, so MTPA tables and estimators tuned on such models fail on hardware; and <\/span><b>slot and barrier harmonics<\/b><span style=\"font-weight: 400;\"> create ripple and current distortion that a sinusoidal model hides.<\/span><\/p><p><b>Modeling choices:<\/b><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Flux-map look-up tables<\/b><span style=\"font-weight: 400;\"> from FEA or measurement\u2014published KIT work stored measured flux linkages and differential inductances on a 2 A grid with 16-bit precision, solving the model on an FPGA every 667 ns.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Spatial harmonics<\/b><span style=\"font-weight: 400;\"> via rotor-angle-dependent (current-current-angle) tables.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Iron-loss representation<\/b><span style=\"font-weight: 400;\"> through loss elements or maps, so emulated efficiency and current phase are realistic.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Time step and latency<\/b><span style=\"font-weight: 400;\"> fast enough that the emulated machine looks correctly <\/span><b>inductive<\/b><span style=\"font-weight: 400;\"> between PWM edges\u2014sub-microsecond steps for current loops in the tens of kHz.<\/span><\/li><\/ul><p><b>Validation:<\/b><span style=\"font-weight: 400;\"> compare emulated and measured <\/span><b>phase currents<\/b><span style=\"font-weight: 400;\">, <\/span><b>torque estimate<\/b><span style=\"font-weight: 400;\"> and <\/span><b>MTPA locus<\/b><span style=\"font-weight: 400;\"> at identical speed, DC-link voltage and current command. Published emulator work reports fixed-point versus floating-point model differences below 0.01% and describes current steps and ripple as \u201cprecisely reproduced\u201d against a real machine, but rarely quotes numeric emulated-versus-measured error. Impedyme\u2019s achieved model-versus-measurement agreement for SynRM:\u00a0<\/span><\/p><h2><span style=\"color: #000000;\">Common problems with synchronous reluctance motors and how to fix them<\/span><\/h2><p><span style=\"font-weight: 400;\">Most field problems with a <strong>synchronous reluctance motor<\/strong> trace back to three roots:\u00a0 wrong or missing rotor-angle information, a magnetic model that ignores saturation, and an inverter sized as if the motor had an induction motor\u2019s power factor.<\/span><\/p><p>\n<table id=\"tablepress-199\" class=\"tablepress tablepress-id-199\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">Symptom<\/th><th class=\"column-2\">Likely cause<\/th><th class=\"column-3\">Fix<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Vibration, no rotation at start<\/td><td class=\"column-2\">Missing initial position estimate; direct-on-line attempt<\/td><td class=\"column-3\">Enable initial-angle detection; use drive SynRM mode; never connect a pure SynRM to the grid<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Loss of synchronism under shock load<\/td><td class=\"column-2\">Pull-out exceeded; low current limit; wrong MTPA table<\/td><td class=\"column-3\">Verify overload margin; raise limit within rating; re-identify flux maps<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Lower torque than expected<\/td><td class=\"column-2\">Angle offset; saturation unmodeled; inverter current limit from low PF<\/td><td class=\"column-3\">Calibrate encoder offset; use flux-map control; check kVA sizing<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Audible whine<\/td><td class=\"column-2\">Injection sensorless; low switching frequency<\/td><td class=\"column-3\">Higher or random injection; raise switching frequency; earlier observer hand-over<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Ripple and resonance<\/td><td class=\"column-2\">Barrier\/slot harmonics; no skew<\/td><td class=\"column-3\">Harmonic current injection; skewed rotor; check coupling resonance<\/td>\n<\/tr>\n<tr class=\"row-7\">\n\t<td class=\"column-1\">Hot stator, cool rotor<\/td><td class=\"column-2\">Higher stator current for same torque<\/td><td class=\"column-3\">Confirm MTPA; consider PM assistance or larger frame; improve cooling<\/td>\n<\/tr>\n<tr class=\"row-8\">\n\t<td class=\"column-1\">Overcurrent entering field weakening<\/td><td class=\"column-2\">Wrong voltage-limit model; regulator saturation<\/td><td class=\"column-3\">Flux-map field-weakening tables; voltage margin; anti-windup<\/td>\n<\/tr>\n<tr class=\"row-9\">\n\t<td class=\"column-1\">(PMa) Torque loss after cold operation<\/td><td class=\"column-2\">Ferrite demagnetization at low temperature<\/td><td class=\"column-3\">Limit demagnetizing current when cold; recheck magnet operating point<\/td>\n<\/tr>\n<tr class=\"row-10\">\n\t<td class=\"column-1\">(PMa) DC-link overvoltage after trip at speed<\/td><td class=\"column-2\">Uncontrolled generation through diodes<\/td><td class=\"column-3\">Active short-circuit; size DC-link\/braking for worst-case back-EMF<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-199 from cache --><\/p><h2><span style=\"color: #000000;\">conclusion<\/span><\/h2><div><div role=\"feed\" aria-label=\"Chat messages\" aria-describedby=\"_r_ce_\"><div tabindex=\"0\" role=\"article\" aria-setsize=\"8\" aria-posinset=\"8\" aria-label=\"Message 8 of 8\"><div><div tabindex=\"-1\" role=\"none\"><div><div><div><div tabindex=\"-1\" role=\"region\" aria-label=\"Artifact panel: Synchronous Reluctance Motor (SynRM): How It Works, Types, Control and Testing\"><div><div><div><div><div><div><p dir=\"ltr\">The <strong>synchronous reluctance motor<\/strong> delivers what induction motors cannot\u2014near-zero rotor loss, a cool rotor and IE4\/IE5 efficiency\u2014without the magnets, cost and supply-chain exposure of PM machines, but it hands the complexity to the drive. Whether you call it a <strong>SynRM<\/strong>, a <strong>sync reluctance motor<\/strong>, a synchronous reluctance machine or an AC reluctance motor, its performance depends on saturation-aware flux maps, accurate rotor-angle information, inverter sizing that respects power factor and a phase-accurate efficiency bench. The fastest way to get those right is to validate inverter, firmware and sensorless algorithms against a high-fidelity <strong>synchronous reluctance<\/strong> model before the first rotor is cut, then confirm on a dynamometer. Impedyme\u2019s FPGA-based real-time motor emulation and power <a href=\"https:\/\/impedyme.com\/hardware-in-the-loop\/\">hardware in the loop<\/a> platforms\u2014the <a href=\"https:\/\/impedyme.com\/chp-series\/\">CHP Series<\/a> hardware with <a href=\"https:\/\/impedyme.com\/electric-motor-simulation-software\/\">MotorSim Studio<\/a> and <a href=\"https:\/\/impedyme.com\/powerhil-studio\/\">PowerHIL Studio<\/a>\u2014let motor-drive, EV and validation teams run flux-map-based SynRM and PM-assisted SynRM models at the inverter terminals, reproduce fault and overspeed cases safely, and compare emulated and measured behaviour point by point, so synchronous reluctance drives reach the test cell already proven.<\/p><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-56fd72f elementor-widget elementor-widget-text-editor\" data-id=\"56fd72f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h3><span style=\"font-weight: 400;\">Frequently Asked Questions\u00a0<\/span><\/h3><p><b>Does a synchronous reluctance motor have magnets?<\/b><\/p><p><span style=\"font-weight: 400;\">\u00a0No\u2014a pure synchronous reluctance motor has no magnets, no cage and no rotor winding; torque comes only from the steel rotor\u2019s saliency. Only the PM-assisted variant adds ferrite or small rare-earth magnets in the flux barriers, typically lifting power factor from the 0.6\u20130.7 band toward 0.8 or higher.<\/span><\/p><p><b>Can a SynRM run without a VFD?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Not in its pure form. With no cage there is no starting torque, so a SynRM connected directly to a 50 or 60 Hz supply vibrates instead of accelerating. It needs an inverter with current-vector control and a known rotor angle; only line-start variants with a partial cage can start direct-on-line, and only with low-inertia loads.<\/span><\/p><p><b>Is a synchronous reluctance motor more efficient than an induction motor?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Usually yes, because its rotor carries no current and has almost no rotor copper loss. Published comparisons show around 2 percentage points at rated load and much more at part load\u2014a 2019 <\/span><i><span style=\"font-weight: 400;\">Energies<\/span><\/i><span style=\"font-weight: 400;\"> study measured 85% versus 72.7% at 25% load for 2.2 kW motors. Always compare motor-plus-drive figures under the same test method.<\/span><\/p><p><b>What power factor does a SynRM have?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">A magnet-free SynRM typically runs at a power factor of about 0.6 to 0.8, set mainly by its saliency ratio; published design work indicates saliency above roughly 9 is needed to exceed 0.8. PM-assisted designs reach about 0.8\u20130.9, cutting the inverter current rating needed for the same shaft power.<\/span><\/p><p><b>Is a synchronous reluctance motor suitable for electric vehicles?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Yes, but usually in PM-assisted form. Pure SynRMs struggle with power density and constant-power range: against a traction target of 55 kW peak and 30 kW continuous over 2,800\u201314,000 rpm, conventional magnet-free designs lagged rare-earth machines. Ferrite assistance, dual-phase steel or stronger rotor structures close much of that gap.<\/span><\/p><p><b>How is a SynRM controlled without a position sensor?<\/b><span style=\"font-weight: 400;\">\u00a0<\/span><\/p><p><span style=\"font-weight: 400;\">Sensorless SynRM drives blend high-frequency injection, which tracks rotor saliency at standstill and low speed, with flux or back-EMF observers at higher speed. Cross-saturation must be compensated using flux maps because it biases the angle under load; holding error within about \u00b13 electrical degrees keeps the MTPA penalty near 1%.<\/span><\/p><p><b>How is a synchronous reluctance motor tested?<\/b><span style=\"font-weight: 400;\"> Testing runs from standstill flux-map identification through efficiency mapping, pull-out, ripple, thermal and fault tests. Low power factor magnifies phase errors\u2014EMPIR MICEV metrology showed a 2\u00b0 error at a 45\u00b0 phase angle causes about 3.5% power error\u2014so instruments must be phase-aligned. A power-HIL motor emulator validates the inverter before any rotor exists.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1cbeb78 elementor-align-center elementor-widget__width-inherit elementor-widget elementor-widget-button\" data-id=\"1cbeb78\" data-element_type=\"widget\" data-rp-stop=\"true\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/impedyme.com\/contact\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Request a Demo<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-57472ea e-con-full e-flex e-con e-child\" data-id=\"57472ea\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-885d9ad elementor-widget elementor-widget-text-editor\" data-id=\"885d9ad\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<!-- ============================================================\n     RELATED PRODUCTS \u2014 sticky sidebar (follows scroll, then stops\n     at the \"Request a Demo\" button). 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pr\u00fcft.<\/p>","protected":false},"author":8,"featured_media":7565,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[12,21],"tags":[],"class_list":["post-7563","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application-knowledge","category-motor"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.7 (Yoast SEO v28.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Synchronous Reluctance Motor (SynRM): How It Works &amp; Testing<\/title>\n<meta name=\"description\" content=\"Synchronous reluctance machine guide: how the SynRM works, vs induction and PM motors, sensorless control, IE4\/IE5 standards and how 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