Study of Electromagnetic Vibration Suppression for Permanent Magnet Synchronous Motors

Abstract

The vibration of permanent magnet synchronous motors (PMSM) can be divided into three frequency bands, mechanical vibration at low frequency, mid-frequency electromagnetic vibration caused by electromagnetic force at even multiples of electrical frequency, and high-frequency vibration near the switching frequency. This paper studies the influence of different rotor structures on the torque ripple and electromagnetic vibration of the PMSM. Taking a PMSM with 9 slots and 6 poles (9s6p) as example, simulation results show that its electromagnetic vibration is mainly caused by the electromagnetic force with the 3rd spatial order and the 2nd time order. The vibration can be reduced, without compromising the torque, by optimizing the motor geometric parameters. Finally, vibration test of the PMSM is carried out, and the experiment results verify the simulation.