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Design of High-Speed Permanent Magnet Motor Considering Rotor Radial Force and Motor Losses

Author

Listed:
  • Nai-Wen Liu

    (Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan)

  • Kuo-Yuan Hung

    (Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan)

  • Shih-Chin Yang

    (Department of Mechanical Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan)

  • Feng-Chi Lee

    (Department of Mechatronics Control, Industrial Technology Research Institute, 195, Sec. 4, Chung Hsing Road, Hsinchu 31057, Taiwan)

  • Chia-Jung Liu

    (Department of Mechatronics Control, Industrial Technology Research Institute, 195, Sec. 4, Chung Hsing Road, Hsinchu 31057, Taiwan)

Abstract

Different from the design of conventional permanent magnet (PM) motors, high-speed motors are primarily limited by rotor unbalanced radial forces, rotor power losses, and rotor mechanical strength. This paper aimed to propose a suitable PM motor with consideration of these design issues. First, the rotor radial force is minimized based on the selection of stator tooth numbers and windings. By designing a stator with even slots, the rotor radial force can be canceled, leading to better rotor strength at high speed. Second, rotor power losses proportional to rotor frequency are increased as motor speed increases. A two-dimensional sensitivity analysis is used to improve these losses. In addition, the rotor sleeve loss can be minimized to less than 8.3% of the total losses using slotless windings. Third, the trapezoidal drive can cause more than a 33% magnet loss due to additional armature flux harmonics. This drive reflected loss is also mitigated with slotless windings. In this paper, six PM motors with different tooth numbers, stator cores, and winding layouts are compared. All the design methods are verified based on nonlinear finite element analysis (FEA).

Suggested Citation

  • Nai-Wen Liu & Kuo-Yuan Hung & Shih-Chin Yang & Feng-Chi Lee & Chia-Jung Liu, 2020. "Design of High-Speed Permanent Magnet Motor Considering Rotor Radial Force and Motor Losses," Energies, MDPI, vol. 13(22), pages 1-16, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:22:p:5872-:d:442883
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    Citations

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    Cited by:

    1. Mitsuhide Sato & Keigo Takazawa & Manabu Horiuchi & Ryoken Masuda & Ryo Yoshida & Masami Nirei & Yinggang Bu & Tsutomu Mizuno, 2020. "Reducing Rotor Temperature Rise in Concentrated Winding Motor by Using Magnetic Powder Mixed Resin Ring," Energies, MDPI, vol. 13(24), pages 1-15, December.
    2. Wuqiang Wang & Yong Li & Dajun Huan & Xiaodong Chen & Hongquan Liu & Yanrui Li & Lisha Li, 2022. "Research on Stress Design and Manufacture of the Fiber-Reinforced Composite Sleeve for the Rotor of High-Speed Permanent Magnet Motor," Energies, MDPI, vol. 15(7), pages 1-22, March.
    3. Tian-Hua Liu, 2021. "Design and Control of Electrical Motor Drives," Energies, MDPI, vol. 14(22), pages 1-3, November.

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