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Optimization Design of Unequal Amplitude Modulated Poles for the Bearingless PMSM

Author

Listed:
  • Huimin Wang

    (School of Electrical Engineering, Tiangong University, Tianjin 300387, China)

  • Yuting Lu

    (School of Electrical Engineering, Tiangong University, Tianjin 300387, China)

  • Shuang Wu

    (School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China)

  • Liyan Guo

    (School of Electrical Engineering, Tiangong University, Tianjin 300387, China)

Abstract

The structural parameters of an equal amplitude modulated magnetic pole is limited by the length of the air-gap. When the modulation ratio or carrier ratio is small, the spacing of permanent magnets is too large, which will lead to a worse cogging effect, and then the torque optimization effect is not satisfying. In order to improve the operation stability of a bearingless permanent magnet synchronous motor (bearingless PMSM), an unequal amplitude modulated magnetic pole structure is proposed according to the principle of magnetic pole modulation. The Taguchi method is used to optimize the structural parameters of the unequal amplitude modulated magnetic pole with the goal of reducing the torque and suspension force fluctuation. Three kinds of magnetic pole structures, named the whole magnetic pole, the equal amplitude modulated magnetic pole and the unequal amplitude modulated magnetic pole are compared and verified. The results show that the proposed structure of the unequal amplitude modulated magnetic pole can effectively further decrease the torque and suspension force fluctuations under the premise of the output capacity of the motor being unchanged, which improves the performance of the bearingless PMSM.

Suggested Citation

  • Huimin Wang & Yuting Lu & Shuang Wu & Liyan Guo, 2022. "Optimization Design of Unequal Amplitude Modulated Poles for the Bearingless PMSM," Energies, MDPI, vol. 15(9), pages 1-13, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:9:p:3097-:d:800823
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    References listed on IDEAS

    as
    1. Daekyu Jang & Junghwan Chang, 2017. "A Novel Design Method for the Geometric Shapes of Flux Modulation Poles in the Surface-Mounted Permanent Magnet Vernier Machines," Energies, MDPI, vol. 10(10), pages 1-16, October.
    2. Daekyu Jang & Junghwan Chang, 2019. "Design and Analysis of Surface-Mounted PM Vernier Machines Considering Harmonic Characteristics of Winding MMF," Energies, MDPI, vol. 12(5), pages 1-10, March.
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