SKF
Rotor Positioning Bearings
Rotor positioning bearings are precision-engineered bearings with integral magnetic encoder rings that provide angular position feedback for the rotor in electric motors — primarily in e-bike drives, servo motors, and small traction applications. Unlike fully integrated sensor units, these bearings provide the encoded ring while the external sensor is mounted separately. SKF supplies these bearings with multipole encoder rings bonded to the inner or outer ring, compatible with common industrial and automotive sensor systems. The bearings themselves are of SKF Explorer quality, ensuring high load capacity and long life. They serve a crucial role in compact, high-efficiency motor applications where external space for traditional encoders is unavailable, simplifying motor design while maintaining precise commutation control.
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Trusted by Industry Leaders
Precise Magnetic Encoding
High pole count rings for precise angular feedback.
Standard Bearing Envelope
Drop-in replacement for non-encoded bearings.
Explorer Quality Bearings
Superior life and noise performance.
Wide Compatibility
Works with Hall effect and magneto-resistive sensors.
Cost-Effective Sensing
Encoder ring adds minimal cost to the bearing.
Compact Motor Architecture
Removes need for external encoder disks and shields.
Applications in E-Bike Motors and Light Electric Vehicles
Mid-drive motors for e-bikes require accurate rotor position to optimize pedal assist. SKF rotor positioning bearings integrate the encoder plane within the bearing, reducing drive system width and weight. The robust seal protects the encoder from chain debris and water.
Pairing with External Sensors: Integration Considerations
The air gap between the encoder ring and the sensor must be maintained within tolerance. SKF provides dimensional data for the ring’s position and recommended sensor specifications to ensure accurate pickup and avoid cross-talk.