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Mag Spring® permanent magnet rotors are high-precision components designed for PMSM, servo, and high-speed electric motors. Each permanent magnet rotor is built with neodymium or rare-earth magnets, precisely machined cores, and dynamically balanced shafts to ensure smooth operation and maximum efficiency. Available in IPM (interior) and SPM (surface-mounted) structures, our rotors deliver exceptional torque density, energy savings, and long service life. Ideal for EV motors, industrial automation systems, compressors, and wind turbines, Mag Spring® provides complete custom permanent magnet rotor solutions with optional high-temperature testing reports (up to 250°C).
Our permanent magnet rotors are widely applied in:
Electric vehicle motors (EV & HEV traction drives)
Servo and CNC spindle motors
Industrial automation drives
Compressors and pumps
Robotics and automation systems
Wind turbine generators
High-speed permanent magnet alternators
Permanent magnet rotors (PM rotors) are the heart of high-performance electric motors. Mag Spring® designs and manufactures high precision permanent magnet motor rotors for various motor types, including PMSM (Permanent Magnet Synchronous Motors), servo motors, EV traction motors, and wind turbine generators.
Our permanent magnet rotors combine advanced magnetic design, precision machining, and dynamic balancing to deliver superior torque density, energy efficiency, and long service life. Whether you need interior permanent magnet (IPM) or surface-mounted permanent magnet (SPM) rotor structures, Mag Spring® provides fully customized solutions to match your design requirements.
Mag Spring® permanent magnet rotors are manufactured using high-grade rare earth materials such as neodymium (NdFeB) magnets or samarium cobalt (SmCo), depending on your temperature and performance requirements.
Each rotor undergoes a complete process of magnetizing, dynamic balancing, and precision assembly to ensure reliable performance even under high-speed and high-load conditions.
High magnetic energy and torque density
Excellent balance for smooth high-speed rotation
Low eddy current loss and minimal vibration
Custom IPM and SPM rotor designs
Tight machining tolerance
ISO 9001 & CE certified production
SPM rotors have magnets mounted directly on the rotor surface, ideal for high-efficiency and cost-effective motor designs.
They are widely used in servo motors, compressors, and industrial drives.
Advantages include simpler construction and excellent speed control characteristics.
IPM rotors embed magnets inside the rotor core for better mechanical stability and higher torque density.
Commonly used in EV traction motors, spindle motors, and PMSM applications requiring field-weakening capability.
For spindle motors and turbo compressors, our high-speed permanent magnet rotors are designed with optimized lamination cores and special magnet retention sleeves made from carbon fiber or titanium alloy.
Each rotor is dynamically balanced to ensure stable rotation up to 40,000 rpm.
| Component | Description |
|---|---|
| Magnet Type | Neodymium (NdFeB), Samarium Cobalt (SmCo), Ferrite |
| Core Material | Silicon steel lamination or soft magnetic composite (SMC) |
| Shaft Material | Stainless steel / Alloy steel |
| Coating Options | Nickel, Epoxy, Zinc, or Customized |
| Operating Temperature | Up to 260°C (with high-temperature NdFeB) or 300°C with smco magnets |
| Balancing Standard | ISO 1940 G2.5 or G1 grade |
Our engineering team supports custom rotor design based on your magnetic circuit simulation, rotor inertia, and torque-speed requirements.
Magnet Preparation: Magnet block cutting, grading, and orientation control.
Rotor Core Machining: CNC precision turning and balancing of lamination stacks.
Assembly & Gluing: Magnet insertion with high-temperature-resistant adhesives.
Dynamic Balancing: Each permanent magnet rotor is dynamically balanced using advanced equipment.
Magnetizing: Rotor magnetization according to required polarity patterns.
Testing & Quality Control: Runout, vibration, and magnetic flux density checks.
All production follows strict ISO9001 quality management and traceability system from raw material to final inspection.
Permanent magnet rotors are widely used in modern high-efficiency electric drive systems, where compact design, energy efficiency, and torque density are crucial.
Thanks to their superior magnetic performance and precision balancing, Mag Spring® permanent magnet rotors provide reliable motion solutions across multiple industries.
Our high-speed permanent magnet rotors are commonly applied in electric vehicle traction motors.
Their interior permanent magnet (IPM) design allows for strong field-weakening capability, ensuring higher efficiency and greater power density at high speed.
Applications include EV drive motors, hybrid traction motors, and onboard generators.
In automation and servo applications, smooth operation and positioning accuracy are key.
Surface-mounted permanent magnet rotors (SPM rotors) provide stable torque output and low vibration, making them ideal for servo motors, CNC machines, robotics, and precision drive systems.
For spindle motors, compressors, and turbo blowers, Mag Spring® offers high-speed permanent magnet rotors designed with carbon-fiber or titanium sleeves for safety and mechanical integrity at speeds up to 40,000 rpm.
These rotors feature optimized lamination cores and dynamic balancing to minimize vibration.
In renewable energy systems, our rare earth permanent magnet rotors are used in wind turbine generators and permanent magnet alternators.
They provide stable magnetic flux, corrosion resistance, and long operational life even in harsh outdoor environments.
Permanent magnet motor rotors help improve the energy efficiency of air compressors, vacuum pumps, chillers, and HVAC fans, supporting energy-saving goals while maintaining high torque at low speed.
Mag Spring® also supplies custom permanent magnet rotors for specialized applications, including medical equipment, aerospace systems, marine drives, and research-grade test motors.
We work closely with OEM engineers to deliver optimized rotor solutions tailored to unique torque-speed and environmental conditions.
Over 20 years of experience in magnetic material and rotor manufacturing
Full in-house machining, magnetizing, and balancing capability
Customized rotor design for different voltage, torque, and RPM requirements
Quick sample development and short lead time
Global supply to Europe, America, and Asia-Pacific markets
Optional magnetic testing reports and high-temperature performance certification (≤300°C) available upon request
Each rotor is packaged with anti-corrosion coating and shock-proof material to ensure safe global transport.
Custom export wooden crates are available for bulk shipment.
Lead Time: 5–6 weeks for bulk orders.
Shipping Options: Air, Sea, or Express (DHL/FedEx).
Q1: What is the difference between an IPM and SPM rotor?
A: IPM (Interior Permanent Magnet) rotors have magnets embedded inside the core, offering higher torque density and mechanical strength. SPM (Surface Mounted Permanent Magnet) rotors mount magnets on the surface, making them simpler and ideal for precision control applications.
Q2: What magnets do you use for permanent magnet rotors?
A: We use high-performance neodymium (NdFeB) magnets for most rotors, and SmCo magnets for high-temperature applications above 250°C.
Q3: Can you provide dynamic balancing reports?
A: Yes. Every rotor is tested according to ISO 1940 standards, and dynamic balancing reports are available upon request.
Q4: What is the maximum operating speed of your permanent magnet rotors?
A: Standard rotors can reach 20,000 rpm, and high-speed custom designs can exceed 40,000 rpm depending on structure and magnet retention design.
Q5: Do you offer OEM and custom design services?
A: Absolutely. We can design and produce custom permanent magnet rotors based on your motor drawings, shaft specifications, or performance data.
