Study of suppression of vibration and noise of PMSM for electric vehicles

Abstract

Zeroth-order spatial electromagnetic force wave has been regarded as one of the main sources for electromagnetic vibration and noise of integer slot multipole permanent magnet synchronous machine (PMSM) used in electric vehicles. In this study, the 48-slot-8-pole built-in permanent magnet synchronous motor for a vehicle was taken as an example. The main sources and characteristic parameters (frequency and amplitude) of the zeroth-order force wave of the integer slot multipole PMSM were presented. Based on this, a method of stator and rotor structure optimisation was proposed to effectively reduce magnitudes of vibration and noise for the machine by increasing the natural frequency and reducing the harmonic content and amplitude of electromagnetic force waves. The comparison of the noise reduced machine with the initial design was experimentally validated.