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Research on a new type of less-rare earth and non-uniform air gap permanent magnet drive motor for electric vehicles

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DOI: 10.23977/jeis.2022.070202 | Downloads: 18 | Views: 750


Jinling Ren 1, Xiaobin Wang 1, Qinglu Zhang 1, Wenxin Wang 1, Xin Lin 1, Jipeng Du 1, Dapai Shi 2


1 Department of Automotive Engineering, Shandong Vocational College of Science and Technology, Weifang, China
2 Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle, Hubei University of Arts and Science, Xiangyang 435003, China

Corresponding Author

Jinling Ren


In view of the problem that the permanent magnet synchronous motor (PMSM) consumes a large amount of rare earth, which leads to the shortage of rare earth resources, a new type of fraction groove winding and non-uniform air gap permanent magnet synchronous motor is developed. Through the design and calculation of the motor structural parameters, the fractional groove winding stator structure is developed with low harmonic content and less stator vortex loss, to optimize the stator structure. In order to study the influence of the uneven air gap on the output characteristics of the motor, the non-uniform air gap motor model is established, and the eccentric degree of the non-uniform air gap is measured by setting the rotor eccentric distance. The results show that the new design less rare earth permanent magnet motor has less rare earth, and compared with the non-uniform air gap model, the torque of the designed motor groove decreases from 1.12 N•m to 0.6N•m. and the noise reduction effect is obvious. The above simulation results verify the correctness of the designed new motor by analyzing the magnetic force line and magnetic flux density of the permanent magnet synchronous motor.


Permanent magnet drive motor, Non-uniform air gap, Rare earth, Finite element simulation, Electric vehicles


Jinling Ren, Xiaobin Wang, Qinglu Zhang, Wenxin Wang, Xin Lin, Jipeng Du, Dapai Shi, Research on a new type of less-rare earth and non-uniform air gap permanent magnet drive motor for electric vehicles. Journal of Electronics and Information Science (2022) Vol. 7: 8-16. DOI:


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