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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Mei Kang & Liang Xu & Jinghua Ji & Xuhui Zhu, 2022. "Design and Analysis of a High Torque Density Hybrid Permanent Magnet Excited Vernier Machine," Energies, MDPI, vol. 15(5), pages 1-16, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1723-:d:758343
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    References listed on IDEAS

    as
    1. Yujun Shi & Linni Jian, 2018. "A Novel Dual-Permanent-Magnet-Excited Machine with Flux Strengthening Effect for Low-Speed Large-Torque Applications," Energies, MDPI, vol. 11(1), pages 1-17, January.
    2. Jang-Hyun Park & Grace Firsta Lukman & Do-Hyun Kang & Jin-Woo Ahn, 2021. "Performance Characteristics of a Dual-Stator, Spoke-Type Permanent Magnet Vernier Machine with Support Bar," Energies, MDPI, vol. 14(4), pages 1-9, February.
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