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Improving Efficiency of a Pole-Changing Vernier Machine Considering Residual Magnetic Flux Density

Author

Listed:
  • Sung-Hyun Lee

    (Department of Electrical and Electronic Engineering, Hanyang University, Ansan 15588, Republic of Korea)

  • Jung-Woo Kwon

    (Department of Electrical and Electronic Engineering, Hanyang University, Ansan 15588, Republic of Korea)

  • Byung-Il Kwon

    (Department of Electrical and Electronic Engineering, Hanyang University, Ansan 15588, Republic of Korea)

Abstract

This paper presents the efficiency improvement of a pole-changing vernier machine (PCVM) by considering the residual magnetic flux density ( B r ) of low coercivity force (LCF) permanent magnets (PMs). The PCVM operates in two modes: vernier machine (VM) mode and permanent magnet synchronous machine (PMSM) mode, achieved through pole-changing. Pole-changing involves reversing the magnetic flux direction of LCF PM to alter the number of rotor pole pairs. By changing the number of rotor pole pairs, the PCVM operates as a VM mode at low speeds, providing high torque, and as a PMSM mode at high speeds, offering high efficiency. To achieve this, a combination of high coercivity force (HCF) PM and LCF PM is utilized in a single structure. The magnetic flux direction in the LCF PM is determined by B r , and the highest efficiency is achieved when B r reaches its maximum value | B r m |. This paper focuses on improving efficiency by obtaining B r m in VM mode and − B r m in PMSM mode through the design process. Additionally, finite element analysis (FEA) is employed to compare the performance of the improved model, which considers B r , with that of the conventional model, designed without considering B r . The improved model achieves higher B r values in each mode compared to the conventional model, resulting in increased torque density. Consequently, this leads to improved efficiency.

Suggested Citation

  • Sung-Hyun Lee & Jung-Woo Kwon & Byung-Il Kwon, 2023. "Improving Efficiency of a Pole-Changing Vernier Machine Considering Residual Magnetic Flux Density," Energies, MDPI, vol. 16(18), pages 1-12, September.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:18:p:6707-:d:1243294
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    References listed on IDEAS

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    1. Xin Ba & Zhenjie Gong & Youguang Guo & Chengning Zhang & Jianguo Zhu, 2022. "Development of Equivalent Circuit Models of Permanent Magnet Synchronous Motors Considering Core Loss," Energies, MDPI, vol. 15(6), pages 1-18, March.
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