Motor Rotor
电机转子
The permanent-magnet motor rotor is the core component that converts electrical energy into mechanical energy. Magnet material, magnetisation pattern, magnetic-circuit structure, and manufacturing precision together determine output torque, speed stability, efficiency, and reliability — rotor design is central to motor performance.
AIC Engineering designs and manufactures rare-earth PM rotors including multi-pole rings, radial-pole rings, and Halbach-array rotors for BLDC, servo, and traction motors. Magnet grade (NdFeB / SmCo), pole count, and skew angle are tuned to the target back-EMF waveform, cogging torque, and operating speed.
Manufacturing controls magnet-to-rotor bonding, skew assembly, and post-assembly magnetisation — followed by dynamic balance and field-distribution verification. The result is a rotor sub-assembly ready for stator pairing, from instrument-grade servo rotors to traction-motor rotors for electric vehicles.
Key Features
Multi-Pole & Radial Rings
Multi-pole magnetised rings and radial-pole rings for high pole counts and sinusoidal back-EMF.
Halbach Rotor Option
Halbach-array rotors concentrate flux on the air-gap side, raising torque density and efficiency.
Low Cogging Design
Skew angle and pole/slot pairing optimised to minimise cogging torque and audible noise.
Dynamic Balanced
Post-assembly magnetisation, dynamic balance, and field-distribution verification before delivery.
Rotor Types
Built to order — send torque, speed, pole count, and stack length. Representative rotor types below.
| Rotor Type | Description | Typical Use |
|---|---|---|
| Surface PM Rotor | Magnet segments bonded to rotor surface; sleeve or banding retention. | Servo motors, high-speed BLDC. |
| Interior PM (IPM) Rotor | Magnets embedded in rotor laminations; reluctance + magnet torque. | Traction motors, EV drive, high-efficiency motors. |
| Multi-Pole Ring Rotor | Single bonded or sintered ring, multi-pole magnetised. | Small BLDC, fans, drones, compact actuators. |
| Radial-Pole Ring Rotor | Radially magnetised ring for sinusoidal field distribution. | Smooth-rotation servo, low-cogging applications. |
| Halbach Rotor | Halbach-oriented segments; air-gap-side field enhancement. | High torque density, lightweight motors. |
| Custom Rotor | Customer-defined pole count, skew, and stack — built to print. | OEM motor integration, proprietary designs. |
Configurable Parameters
No fixed catalogue grades — each rotor is designed to your motor specification. Typical ranges below.
| Parameter | Typical Range | Notes |
|---|---|---|
| Magnet Material | NdFeB (N42–N52) / SmCo | SmCo for high-temperature service. |
| Pole Count | 2 – 24 poles | Selected with slot count for cogging target. |
| Magnetisation | Radial / parallel / Halbach | Radial for sinusoidal back-EMF. |
| Skew Angle | 0 – 30° | Step or continuous skew to reduce cogging. |
| Rotor OD | 10 – 300 mm | Per motor envelope; custom on request. |
| Operating Temp. | −40 to 180 °C | Grade and coating dependent. |
| Balance | G2.5 / G6.3 | Per ISO 1940; verified after magnetisation. |
Values are typical design ranges — confirmed torque, dimensions, and pole pattern are provided per quotation after magnetic-circuit review.
Design & Manufacturing
Magnetic-circuit design first, then lamination and magnet sourcing, rotor assembly, magnetisation, and balance verification.
- Torque, speed & back-EMF specification
- Pole / slot count and skew optimisation
- Magnet grade & magnetisation pattern
- FEA field and cogging-torque simulation
- Rotor lamination stack preparation
- Magnet bonding / insertion to rotor
- Sleeve or banding retention (surface PM)
- Skew assembly where specified
- Post-assembly pulse magnetisation
- Field-distribution measurement
- Dynamic balance to G2.5 / G6.3
- Dimension & protective packaging
Typical Applications
Need a Custom PM Motor Rotor?
Send your torque, speed, pole count, and stack length — our engineers will design the magnetic circuit, select magnet grade and magnetisation, and propose a ready-to-pair rotor.
Discuss Custom RequirementsFrequently Asked Questions
Answers to common questions about our magnets, customisation, ordering and shipping.
- What types of PM motor rotors do you manufacture? +
- AIC manufactures surface PM, interior PM (IPM), multi-pole ring, radial-pole ring, and Halbach rotors for BLDC, servo, and EV traction motors — built to your pole count, skew, and stack length.
- How do you reduce cogging torque? +
- Cogging torque is minimised by optimising pole/slot count, skew angle (step or continuous skew), and magnetisation pattern, verified by FEA and post-assembly field-distribution measurement.
- Are rotors dynamically balanced? +
- Yes. Rotors are pulse-magnetised post-assembly, field-distribution verified, and dynamically balanced to ISO 1940 G2.5 / G6.3 before delivery.