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<p>In recent years, flux-switching machines (FSMs) have received extensive attention due to their high-power density and high efficiency. To further enhance machine performance and reduce the total harmonic distortion (THD) of the back electromotive force (back-EMF), a novel U-type outer rotor flux switching permanent magnet machine (OR-FSPMM) is proposed. The proposed configuration employs auxiliary permanent magnets (APMs) interspersed between I-type PMs, with each conventional PM isolated by an air gap to enhance flux concentration effect while minimizing leakage. Key parameters are determined through comprehensive sensitivity analysis and optimized using a multi-objective genetic algorithm (MOGA) in combination with response surface methodology (RSM) and single-parameter scanning. Consequently, a novel U-type OR-FSPMM model is built. In comparison to the conventional OR-FSPMM, the proposed design exhibits significant improvements, including enhanced air gap flux density amplitude, a remarkable reduction in cogging torque by 46.87%, and a notable reduction in back-EMF THD by 35.78%.</p>

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Analysis and Optimization of a Novel U-Type Outer‑Rotor Flux‑Switching PM Machine

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Longxiang Han,
  • Libing Jing

摘要

In recent years, flux-switching machines (FSMs) have received extensive attention due to their high-power density and high efficiency. To further enhance machine performance and reduce the total harmonic distortion (THD) of the back electromotive force (back-EMF), a novel U-type outer rotor flux switching permanent magnet machine (OR-FSPMM) is proposed. The proposed configuration employs auxiliary permanent magnets (APMs) interspersed between I-type PMs, with each conventional PM isolated by an air gap to enhance flux concentration effect while minimizing leakage. Key parameters are determined through comprehensive sensitivity analysis and optimized using a multi-objective genetic algorithm (MOGA) in combination with response surface methodology (RSM) and single-parameter scanning. Consequently, a novel U-type OR-FSPMM model is built. In comparison to the conventional OR-FSPMM, the proposed design exhibits significant improvements, including enhanced air gap flux density amplitude, a remarkable reduction in cogging torque by 46.87%, and a notable reduction in back-EMF THD by 35.78%.