Design and Analysis of a High Torque Density Hybrid Permanent Magnet Excited Vernier Machine

Mei Kang, Liang Xu, Jinghua Ji and Xuhui Zhu
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Mei Kang: School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
Liang Xu: School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
Jinghua Ji: School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China
Xuhui Zhu: School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China

Energies, 2022, vol. 15, issue 5, 1-16

Abstract: Permanent magnet (PM) excited vernier machines capable of high torque density have good potential for electric vehicles while requiring high rare earth PM consumption. To achieve a high torque density at a reasonable material cost, hybrid PM excited vernier machines incorporating both expensive rare earth and low-cost ferrite magnets are investigated in this paper. Various combinations of PM arrangements for the hybrid permanent magnet excited vernier machine are investigated to acquire low cost and superior torque density. The best solution obtained is that the PM on the stator adopts rare earth material while the rotor uses ferrite. Furthermore, the PMs on the stator are arranged in an iron-cored Halbach array, which can reduce leakage flux and enhance flux density effectively and the ferrite PMs are used in the rotor, therefore, high-temperature demagnetization is avoided. Then, the reluctance torque and the cogging torque can offset each other effectively, which is beneficial to reducing the torque ripple and smoothing the electromagnetic torque. Finally, a prototype is manufactured and tested to verify the correctness of the theoretical analysis.

Keywords: vernier machine; hybrid permanent magnet excited; cogging torque; torque ripple (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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