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Methods for Reducing Cogging Force in Permanent Magnet Machines: A Review

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  • Wenjuan Hao

    (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
    College of Jincheng, Nanjing University of Aeronautics and Astronautics, Nanjing 211156, China)

  • Gong Zhang

    (College of Electronic and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China)

  • Wenbo Liu

    (Department of Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China)

  • Hui Liu

    (College of Jincheng, Nanjing University of Aeronautics and Astronautics, Nanjing 211156, China)

  • Yu Wang

    (Department of Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China)

Abstract

Permanent magnet (PM) machines inevitably suffer from cogging force, which does not contribute to the average output torque (force) but contributes as a type of torque (force) ripple. This paper provides an overview of the cogging force reduction methods for different types of PM machines. First, a systematic and comprehensive categorization of different kinds of cogging force reduction methods is given according to the reduction principle. Then, the cogging force reduction methods for different types of PM machines are analyzed and discussed based on the categorization. Finally, according to the versatility and feasibility of the cogging force reduction methods, practical methods are recommended for different types of PM machines. The categorization, analyses, and recommendations presented in the paper are useful for the design of different types of PM machines with the requirement of cogging force reduction or output torque (force) ripple suppression.

Suggested Citation

  • Wenjuan Hao & Gong Zhang & Wenbo Liu & Hui Liu & Yu Wang, 2022. "Methods for Reducing Cogging Force in Permanent Magnet Machines: A Review," Energies, MDPI, vol. 16(1), pages 1-27, December.
    • Handle: RePEc:gam:jeners:v:16:y:2022:i:1:p:422-:d:1019619
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    References listed on IDEAS

    as
    1. Wenjuan Hao & Yu Wang, 2018. "Comparison of the Stator Step Skewed Structures for Cogging Force Reduction of Linear Flux Switching Permanent Magnet Machines," Energies, MDPI, vol. 11(8), pages 1-14, August.
    2. Yu Wang & Wenjuan Hao, 2018. "A Torque Impulse Balance Control for Multi-Tooth Fault Tolerant Switched-Flux Machines under Open-Circuit Fault," Energies, MDPI, vol. 11(7), pages 1-21, July.
    3. Wenjuan Hao & Yu Wang, 2017. "Thrust Force Ripple Reduction of Two C-Core Linear Flux-Switching Permanent Magnet Machines of High Thrust Force Capability," Energies, MDPI, vol. 10(10), pages 1-13, October.
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