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Reduction of Unipolar Leakage Flux and Torque Ripple in Consequent-pole PM vernier machine

CES Transactions on Electrical machines and Systems 2023年第1期7卷 35-44页

作者： Liang Xu Yang Li Wenxiang Zhao Guohai Liu the School of Electrical and Information Engineering Jiangsu UniversityZhenjiang212013China the Jiangsu Key Laboratory of Drive and Intelligent Control for Electric Vehicle and the National Center for International Research on Structural Health Management of Critical ComponentsJiangsu UniversityZhenjiang212013China IEEE

This paper proposes a new consequent-pole permanent magnet vernier machine(CPMVM),which can be regarded as a combination of two conventional CPMVM with opposite polarities.Based on the simplified axial magnetic circuit model,it is verified that the proposed CPMVM can reduce the unipolar leakage flux.In order to reduce the torque ripple of machine and improve the output torque of machine,the flux barrier is placed on the rotor of the proposed machine.Then,the parameters of the proposed CPMVM are optimized and determined.Moreover,the electromagnetic performance,including no-load air-gap flux density,average torque and torque ripple,flux linkage,back-electromotive force,cogging torque,average torque,torque ripple,power factor and loss,is compared with conventional surface-mounted permanent magnet vernier machine(SPMVM)and CPMVM.Finally,it is demonstrated that proposed CPMVM with flux barrier can effectively reduce the unipolar leakage flux and greatly reduce the torque ripple of machine.Also,compared with the SPMVM,the proposed CPMVM with flux barrier saves more than 45%of the permanent magnet material without reducing output torque.

关键词： Consequent-pole permanent magnet vernier machine Unipolar leakage flux Torque ripple Flux barrier Output torque

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magnets Shifting Design of Dual PM Excited vernier machine for High-torque Application

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Chinese Journal of Electrical Engineering 2022年第3期8卷 90-101页

作者： Feilong Yan Jinghua Ji Zhijian Ling Yuhua Sun Wenxiang Zhao School of Electrical and Information Engineering Jiangsu UniversityZhenjiang 212013China

In this study,a novel dual permanent magnet excited vernier machine(DPMEVM)with magnets shifting in stator is proposed.Compared with the conventional permanent magnet synchronous machine(PMSM),the DPMEVM based on the bidirectional field modulation effect can operate in a wider torque range.However,the torque ripple of a conventional DPMEVM is high because of the superposition of the torque generated by the stator-side and rotor-side PMs.Consequently,a novel DPMEVM with magnets shifting is proposed to further reduce the torque ripple.First,the topologies and working principles of the baseline machine and proposed machines are introduced.Second,the torque-contribution harmonics are analyzed and calculated using the Maxwell tensor method.The calculation results reveal that the DPMEVM,benefiting from multiple working harmonics,can offer an enhanced torque capability compared to the PMSM.In addition,the torque ripple characteristics of the proposed machines are analyzed.It is verified that the torque ripple can be significantly reduced through magnets shifting.Third,the performances of the baseline machine and proposed machines are analyzed and compared in terms of flux density,open-circuit back-EMF,and torque characteristics.In addition,the proposed principle can be extended to machines with the same unit motor.Finally,a 120s-110p prototype machine is manufactured for validation.

关键词： permanent magnet vernier machine bidirectional field modulation effect magnets shifting multiple working harmonics torque

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