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Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM

Author

Listed:
  • Chaelim Jeong

    (Department of Industrial Engineering, University of Padova, 35131 Padova, Italy)

  • Dongho Lee

    (Sungshin Precision Global (SPG) Co., Ltd., Incheon 21633, Korea)

  • Jin Hur

    (Department of Electrical Engineering, Incheon National University, Incheon 22012, Korea)

Abstract

This paper presents a mitigation method of slot harmonic cogging torque considering unevenly magnetized magnets in a permanent magnet synchronous motor. In previous studies, it has been confirmed that non-uniformly magnetized permanent magnets cause an unexpected increase of cogging torque because of additional slot harmonic components. However, these studies did not offer a countermeasure against it. First, in this study, the relationship between the residual magnetic flux density of the permanent magnet and the cogging torque is derived from the basic form of the Maxwell stress tensor equation. Second, the principle of the slot harmonic cogging torque generation is explained qualitatively, and the mitigation method of the slot harmonic component is proposed. Finally, the proposed method is verified with the finite element analysis and experimental results.

Suggested Citation

  • Chaelim Jeong & Dongho Lee & Jin Hur, 2019. "Mitigation Method of Slot Harmonic Cogging Torque Considering Unevenly Magnetized Permanent Magnets in PMSM," Energies, MDPI, vol. 12(20), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:20:p:3887-:d:276431
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    References listed on IDEAS

    as
    1. Jung-Woo Kwon & Jin-hee Lee & Wenliang Zhao & Byung-Il Kwon, 2018. "Flux-Switching Permanent Magnet Machine with Phase-Group Concentrated-Coil Windings and Cogging Torque Reduction Technique," Energies, MDPI, vol. 11(10), pages 1-11, October.
    2. Pierpaolo Dini & Sergio Saponara, 2019. "Cogging Torque Reduction in Brushless Motors by a Nonlinear Control Technique," Energies, MDPI, vol. 12(11), pages 1-20, June.
    3. Myeong-Hwan Hwang & Hae-Sol Lee & Hyun-Rok Cha, 2018. "Analysis of Torque Ripple and Cogging Torque Reduction in Electric Vehicle Traction Platform Applying Rotor Notched Design," Energies, MDPI, vol. 11(11), pages 1-14, November.
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