Study on Robust Optimization Method for Cogging Torque Reduction Accounting for Manufacturing Errors of the Motor

Tomoya Uchimura
Electromechanical Systems Department, Advanced Technology R&D Center, Mitsubishi Electric Corporation


Cogging torque reduction is essential for the improvement of positioning accuracy and the reduction of noise and vibration in permanent magnet servo motors for industrial and automotive use.
Careful design of the geometry of permanent magnets and stator cores can reduce cogging torque reasonably, however, various manufacturing errors can increase the cogging torque and cause a problem in servo drives.
In this study, several types of manufacturing error in motor geometry were examined to reduce cogging torque to an acceptable level using design method that combining JMAG and the optimization software modeFRONTIER.

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