A Six-Phase Permanent Magnet Synchronous Motor Cogging Torque Weakening Method Based on Multi-parameter Composite Optimization

Abstract

In order to reduce the cogging torque of a six-phase permanent magnet synchronous motor, this paper proposes a multi-parameter composite optimization method to reduce cogging torque by using a 10-pole 12-slot six-phase permanent magnet synchronous motor as the research object. By analyzing the mechanism of cogging torque generation, the finite element models of polar arc coefficients and eccentric magnetic poles are parametrically analyzed separately to study their effects on cogging torque. The response surface method is used to solve for the combination of pole arc coefficient and eccentric chipping pole to find the optimal pole arc coefficient and the appropriate eccentric distance. The corresponding finite element models are established based on the parameters before and after optimization, and the performance parameters such as cogging torque, no-load back EMF, air gap flux density, and output torque are compared. The results show that the method reduces the cogging torque by 99.7%, which has a significant optimization effect and verifies the effectiveness and feasibility of the method.