Torque Ripple Suppress Method of Double-layer Interior Permanent Magnet Synchronous Machines for Electric Vehicle

doi:10.3969/j.issn.1000-1093.2021.10.021

Abstract

Abstract: There is still a mount of torque ripples after conventional rotor step-skewing. For this problem, a method to suppress torque ripple based on torque waveform symmetry optimization and double-segment rotor step-skewing is proposed. A magnetic circuit analytical model is established to analyze the torque harmonics of a double-layer interior permanent magnet motor systematically. The main characteristic order of torque harmonics causing the torque ripple is revealed. The accuracy of the analytical model is verified by magnetic finite element analysis. The rotor magnetic pole is optimized by the analytical model to suppress the specific subharmonic of torque and improve the symmetry of torque waveform in the condition of keeping the electromagnetic performance of motor unchanged. The double-segment rotor step-skewing is used to further weaken the torque harmonics which cause torque ripple. The simulated results show that the proposed method is used to reduce the torque ripple of benchmark motor effectively compared with the conventional rotor step-skewing.

Key words: permanentmagnetsynchronousmachine, double-layerinterior, torqueripplesuppress, airgapfluxdensity

CLC Number:

TM351

SUN Chengxu, LI Qi, FAN Tao, WEN Xuhui, LI Ye, WANG Yanyan, TAN Ping. Torque Ripple Suppress Method of Double-layer Interior Permanent Magnet Synchronous Machines for Electric Vehicle[J]. Acta Armamentarii, 2021, 42(10): 2251-2259.

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