Torque ripple analysis and suppression method of novel asymmetric interleaved magnetic pole permanent magnet synchronous motor
Geng Kai
Hu Wenjing
Liu Lin
Wu Jinke
Han Yutong
Hua Sizhan
Wang Wei
Abstract：Objectives Aiming at the problems of large air gap flux density waveform distortion and high torque ripple of traditional symmetrical magnetic pole permanent magnet synchronous motor(PMSM),a novel rotor of asymmetric interleaved magnetic pole PMSM was proposed.Methods The equivalent magnetic circuit model of the motor considering non-uniform air gap and leakage flux was established.Combined with the winding function theory,the analytical expressions of air gap flux density and torque ripple coefficient were derived.The influence law of rotor magnetic pole parameters on the amplitude of flux density harmon-ics and suppressing torque ripple was analyzed.By using the finite element method,the air gap flux den-sity amplitude,cogging torque and output torque of the motor were taken as the optimization objectives.The structural parameters of the rotor eccentricity,magnetic pole deflection angle and moving distance were optimized.The optimal matching parameters was obtained.The prototype was experimentally verified,and the electromagnetic characteristics and output performance before and after optimization were com-pared.Results The results showed that when the rotor eccentricity was 10.5 mm,the deflection angle of the rotor magnetic pole was 4.5 °,and the moving distance was 0.1 mm,the air gap flux density waveform dis-tortion rate was reduced by 53.3%.The cogging torque and torque ripple were reduced by 24.4%and 56.3%,respectively.The average output torque was increased by 1.6%.The relative error between the ex-perimental value and the simulation value of the cogging torque and the output torque of the prototype were 6.06%and 2.30%respectively.The difference between the results was small,which verified the effective-ness of the finite element analysis method.Conclusions the new structure and magnetic pole parameter opti-mization method proposed in this paper could effectively reduce the harmonic content of the air gap mag-netic density.The torque ripple was suppressed and the motor operation performance was improved.A theo-retical reference for the analysis and optimization of PMSM torque ripple was provided.
Keywords：permanent magnet synchronous motorinterleaved magnetic polemagnetic pole deflection and movementnon-uniform air gaptorque ripple
Publication Date：2026-02-28
Online Publishing Date：2025-12-15(First online date of this platform, not the publication date of the document)
Pages：11( 143-152,169 )