Optimization and analysis of asymmetrical hybrid permanent magnetmotor for electric vehicle

Abstract

Aiming at the problems of large amount of rare earth materials and too high cogging torque of traditional rare earth permanent magnet motor,an asymmetrical hybrid magnetic pole permanent magnet motor structure was proposed.The equivalent magnetic circuit model was established,parametric modeling was carried out for the motor,and ferrite width and other motor parameters were selected for sensitivity analysis.According to sensitivity results,the hybrid algorithm combining the BBD algorithm and the MOGA- Ⅱ method and the CCD multi-objective algorithm were used for optimization,so as to determine the optimal size parameters of the motor,and analyze and compare the electromagnetic performance of the asymmetric hybrid permanent magnet motor and the traditonal V-type motor.The results show that compared with the traditional V-type motor,the torque ripple and cogging torque of the asymmetrical hybrid permanent magnet motor are reduced by 14% and 71%,respectively,and the amount of Ndfeb material used is reduced by 14.3%.The proposed new type of asymmetric hybrid permanent magnet motor for electric vehicles effectively solves the problems such as large amount of rare earth materials and too high cogging torque,which provides a certain theoretical reference for automobile permanent magnet motor.

Keywords

• electrical machinery; permanent magnet motor; cogging torque; hybrid magnetic pole; asymmetric