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<p>This paper presents a hybrid dual permanent magnet (HDPM) machine that combines stator-mounted NdFeB magnets with rotor-embedded ferrites in a consequent-pole configuration, enhancing permanent magnet utilization while reducing rare-earth material consumption. The proposed design leverages a bidirectional modulation effect and an asymmetric stator-pole (ASP) topology to generate high-torque working harmonics. Four HDPM variants with Halbach-array ferrite rotors and distinct ASP structures are optimized using a multi-objective non-dominated sorting genetic algorithm II (NSGA-II), and their electromagnetic performance is comparatively analyzed. The results reveal superior torque density and efficiency in the proposed machine. Additionally, a 3D finite element analysis investigates the torque-enhancement mechanism of the rotor-ferrite overhang structure. Finally, experimental validation via a fabricated split stator-pole HDPM-ASP prototype confirms the machine’s effectiveness.</p>

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Comparative Analysis of Hybrid Dual Permanent Magnet Machines with Different Asymmetric Stator-Pole Topologies

  • 期刊论文

  • 发表日期：

    2025年6月5日

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  • Guangyao Jiang,
  • Huawei Zhou,
  • Chen Ye,
  • Guang-Jin Li,
  • Yu Zeng

摘要

This paper presents a hybrid dual permanent magnet (HDPM) machine that combines stator-mounted NdFeB magnets with rotor-embedded ferrites in a consequent-pole configuration, enhancing permanent magnet utilization while reducing rare-earth material consumption. The proposed design leverages a bidirectional modulation effect and an asymmetric stator-pole (ASP) topology to generate high-torque working harmonics. Four HDPM variants with Halbach-array ferrite rotors and distinct ASP structures are optimized using a multi-objective non-dominated sorting genetic algorithm II (NSGA-II), and their electromagnetic performance is comparatively analyzed. The results reveal superior torque density and efficiency in the proposed machine. Additionally, a 3D finite element analysis investigates the torque-enhancement mechanism of the rotor-ferrite overhang structure. Finally, experimental validation via a fabricated split stator-pole HDPM-ASP prototype confirms the machine’s effectiveness.