Switched Reluctance Motor

Switched Reluctance Motor (SRM) Solutions for Industrial OEMs & Distributors

We manufacture heavy-duty switched reluctance motors (SRMs) designed for industrial equipment OEMs, machine builders, and global wholesale distributors. Engineered with a pure laminated electrical steel rotor without permanent magnets, rotor windings, or brushes, our SRMs provide high reliability under extreme thermal, centrifugal, and continuous duty stresses.

Unlike induction motors and permanent-magnet motors, an SRM produces torque by sequentially energizing stator phases and attracting the salient rotor poles toward the position of minimum magnetic reluctance. The rotor contains laminated electrical steel without permanent magnets, rotor windings, slip rings, or brushes. This simple rotating structure reduces the number of components exposed to centrifugal and thermal stress and makes SRMs particularly suitable for demanding speed and duty-cycle requirements.

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Technical Specifications

Parameter	Specification
Power Range	0.5 kW–250 kW; custom power ratings available upon request
Rated Voltage	220 V AC / 380 V AC / 400 V AC / 460 V AC; custom DC bus voltage available
Operating Speed	300–12,000 RPM; high-speed options up to 15,000 RPM
Continuous Torque	Up to 1,500 Nm
Overload Capability	150%–200% peak torque for up to 60 seconds*
Duty Cycle	S1 (Continuous Duty) / S3 (Intermittent Duty)
Insulation Class	Class F (155°C) / Class H (180°C)
Protection Rating	IP55 / IP65 / IP67
Cooling Options	IC411 (Self-Ventilated) / IC416 (Forced Cooling) / Liquid-Cooled
Feedback Systems	Incremental Encoder / Resolver / Sensorless Position Estimation
Compliance & Certification	CE / RoHS / ISO 9001 Quality Management System

Key Advantages

Eliminates Rare-Earth & Thermal Demagnetization Risks

Our SRM rotor contains no rare-earth permanent magnets (such as NdFeB), rotor copper windings, or conductive aluminum bars.
Supply Chain Security: Completely removes reliance on volatile rare-earth raw material prices.
High-Temperature Stability: Eliminates permanent magnet demagnetization failures in elevated ambient or continuous peak-load operating conditions.
Minimal Rotor Heat: Heat losses are concentrated almost entirely in the stator, making thermal management simpler and extending bearing lifespan.

High Starting Torque with Low Inrush Current

By energizing stator phases sequentially based on rotor position, the SRM delivers high starting torque without the severe current spikes typical of direct-on-line induction motors.
Starting Torque: Up to 200% of rated torque.
Frequent Start/Stop Duty: Ideal for dynamic acceleration, reversing, and rapid duty cycles without electrical rotor overheating.

High-Speed Structural Integrity

Without rotating copper coils, slip rings, or fragile surface magnets, the simple laminated iron rotor offers extreme mechanical robustness.
High Centrifugal Load Resistance: Suitable for direct-drive high-speed pumps and compressors.
Reduced Wear Points: Eliminates brush maintenance, rotor bar cracking, and winding insulation degradation on the rotating assembly.

Integrated Motor & Controller Matching

To prevent procurement mismatches where a motor is selected solely by power rating while failing under dynamic controller conditions, we provide pre-matched drive packages and control tuning:

DC Bus Voltage Optimization: Matches converter switching capability with speed demands.

Current Profile & Angle Tuning: Custom turn-on and turn-off firing angles to maximize energy efficiency.

Sensor Configuration: Tailored encoder or sensorless control strategy depending on vibration levels.

Industrial Communication Interfaces: Modbus-RTU, CANopen, PROFIBUS, or EtherCAT support.

Advanced Torque Ripple & Acoustic Noise Control

Torque ripple and acoustic vibration are recognized characteristics of the doubly salient SRM structure. Rather than ignoring these engineering challenges, our design and manufacturing process actively mitigates them at both structural and control levels:

Stator & Rotor Pole Geometry

Optimized lamination profiles and air-gap uniformity to smooth inductance transitions.

Structural Rigidity

Reinforced housing stiffness and precision G2.5 dynamic balancing to minimize mechanical resonance.

Algorithm Tuning

Phase current profiling and overlap timing strategies tailored to reduce force harmonics during phase commutation.

Optional Test Data Provided Upon Request

Dynamic Torque Ripple Analysis
Vibration Velocity Testing (ISO 10816 compliant)
Sound Pressure Level dB(A) Curve across operating speed range

Target Industrial Applications

Industrial Pumps

Variable-speed fluid transfer and direct-drive centrifugal pumps operating up to 6,300 RPM.

Compressors & Blowers

Continuous duty screw compressors and industrial air blowers requiring wide speed regulation.

Conveyors & Feeders

Bulk material handling systems demanding high breakaway torque under full load.

Extruders & Mixers

Rubber and plastic extrusion equipment requiring continuous low-speed high-torque operation.

Harsh-Environment OEM Equipment

Machinery exposed to high ambient temperatures, dust, or severe shock loads.

OEM Customization & Quality Control

Customizable Parameters

Frame size (Standard IEC foot/flange or custom dimensions)
Shaft geometry (Keyed, splined, smooth, or dual-extension)
Winding turns and wire gauge for target voltage/speed matching
Integrated mechanical brakes, thermistors (PT100/PTC), and specialized connectors
Custom nameplates, private label branding, and export packaging

Quality Assurance & Factory Testing

Every production batch undergoes strict quality control prior to shipment:

Stator Winding & Insulation Testing: Hi-Pot insulation test, phase resistance, and surge testing.
Rotor Mechanical Inspection: Concentricity runout check and G2.5 dynamic balancing.
System Performance Testing: No-load test, full-load torque-speed verification, efficiency mapping, and temperature rise inspection.

Procurement & Commercial Terms

Sample Delivery	15 to 25 business days for customized engineering samples.
Mass Production Lead Time	30 to 40 days based on batch volume.
Minimum Order Quantity (MOQ)	Flexible MOQ for standard frame sizes; custom OEM projects evaluated per design.
Quality Warranty	18 months standard factory warranty on motor and drive system.
Export Documentation	Commercial Invoice, Packing List, Certificate of Analysis/Inspection, CE Certificate, and CO/Form E.

FAQ

Q: How does an SRM perform in high-ambient-temperature environments compared to permanent-magnet (PMSM) motors?

A: SRMs perform exceptionally well in high-temperature conditions. Because the rotor contains no permanent magnets (such as NdFeB), there is zero risk of thermal demagnetization failure. Furthermore, heat losses occur almost entirely within the stator, making heat dissipation significantly easier and protecting the rotor assembly from dynamic thermal stress.

Q: What is the typical acoustic noise and torque ripple level, and how is it controlled?

A: Torque ripple and acoustic vibration are inherent characteristics of doubly salient motor structures. However, we minimize these effects through optimized pole geometry, reinforced housing rigidity, and fine-tuning the controller’s phase-commutation angles. For noise-sensitive machinery, we provide low-noise controller algorithms and dynamic balancing up to G2.5 precision.

Q: Do you offer custom shaft dimensions, mounting flanges, and custom winding configurations?

A: Yes. As an OEM manufacturer, we can customize shaft geometry (keyed, splined, smooth, extended), IEC/NEMA flange mountings, winding specs for specific DC bus voltages, IP ratings (up to IP67), thermistors (PT100/PTC), and terminal box orientations according to your machinery drawings.

Q: What technical documentation is provided with wholesale and OEM orders?

A: Every OEM batch is supplied with complete technical documentation, including 2D dimensional drawings, 3D CAD models (STEP format), torque-speed performance curves, system connection diagrams, factory test reports (Hi-Pot, dynamic balance, efficiency mapping), and CE/RoHS compliance certificates.

Q: What is your typical sample delivery time and mass production lead time?

A: Standard customized samples take approximately 15 to 25 business days for design verification and factory testing. Mass production batch orders typically require 30 to 40 days, depending on order volume and custom housing requirements.

Q: What warranty terms and aftermarket support do you offer for overseas buyers?

A: We provide an 18-month standard factory warranty covering manufacturing defects on both the motor and matched controller. Our engineering team also provides remote technical support for controller parameter tuning, site commissioning troubleshooting, and system integration.

As one of the leading switched reluctance motor manufacturers and suppliers in China, we warmly welcome you to buy advanced switched reluctance motor for sale here from our factory. All customized motors are with high quality and competitive price.

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