Simulation Analysis and Optimization of Electromagnetic Vibration and Noise of Permanent Magnet Motor

As the precision requirements of the machining industry continue to advance, the performance criteria for spindle motors are becoming increasingly stringent. Noise and vibration play a critical role in motor performance and must, therefore, be effectively reduced.

The present study thus employs ANSYS simulations to examine the electromagnetic vibration and noise characteristics of a permanent magnet motor (PMM) with a rated power of 21 kW. The simulations are performed at both the rated speed of 6000 rpm and the maximum speed of 24,000 rpm. Based on the simulation results, the structure of the PMM is optimized in such a way as to reduce the vibration and noise of the motor. The optimization process considers three different structural arc modification strategies: (1) arc trimming of the rotor structure, (2) arc trimming of the stator structure, and (3) arc trimming of both the rotor and the stator structures.

The optimal performance improvement is obtained using the rotor/stator arc trimming strategy with a rotor arc trimming angle of 8° and a stator shoe offset of 32 mm.