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<p>This paper presents a comparative electromagnetic investigation of four flux-reversal machine (FRM) topologies, including the conventional FRM (CPFRM), dual-PM FRM (DPFRM), full-Halbach FRM (FHFRM), and half-Halbach FRM (HHFRM). By introducing dual-PM excitation and different Halbach arrays schemes, the influence of PM distribution on air-gap field modulation, torque characteristics, loss components, and thermal behavior is analyzed. The air-gap flux density and harmonic characteristics under no-load conditions are investigated to clarify the field modulation mechanism. Back-EMF, cogging torque, and load torque performances are evaluated through finite element analysis, and the effects of PM configuration on PM eddy current loss and core loss are discussed. In addition, the influence of rotor chamfering on electromagnetic torque is examined as a supplementary design consideration. The results show that dual-PM excitation significantly enhances torque capability, while Halbach arrays effectively reduces flux leakage and PM eddy current loss.</p>

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Electromagnetic Performance Comparison of Flux-Reversal Machines with Different PM Configurations

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • YeMing Zhu,
  • MingJi Yin,
  • YuHui Huang,
  • LongXiang Han,
  • LiBing Jing

摘要

This paper presents a comparative electromagnetic investigation of four flux-reversal machine (FRM) topologies, including the conventional FRM (CPFRM), dual-PM FRM (DPFRM), full-Halbach FRM (FHFRM), and half-Halbach FRM (HHFRM). By introducing dual-PM excitation and different Halbach arrays schemes, the influence of PM distribution on air-gap field modulation, torque characteristics, loss components, and thermal behavior is analyzed. The air-gap flux density and harmonic characteristics under no-load conditions are investigated to clarify the field modulation mechanism. Back-EMF, cogging torque, and load torque performances are evaluated through finite element analysis, and the effects of PM configuration on PM eddy current loss and core loss are discussed. In addition, the influence of rotor chamfering on electromagnetic torque is examined as a supplementary design consideration. The results show that dual-PM excitation significantly enhances torque capability, while Halbach arrays effectively reduces flux leakage and PM eddy current loss.