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<p>This study focuses on direct-drive applications that require low speed and high torque. A dual-stator permanent-magnet/reluctance synchronous machine is established, consisting of an interior reluctance rotor and an outer Halbach permanent-magnet rotor. Then finite-element analysis (FEA) with a unified mesh and time step is used to evaluate torque characteristics, followed by comparative analysis of three ripple-mitigation strategies: fundamental-component phase alignment, axial slot-skew averaging, and phase-coordinated selective sequence injection (PC-SSI). The results indicate that Halbach magnetization enhances the fundamental component of the outer air-gap flux density while suppressing inner-side leakage flux, thereby increasing the electromagnetic torque by approximately 14.6% compared with the radial-magnet arrangement under the same current excitation. Under identical finite-element computation settings, the proposed PC-SSI reduces the peak-to-peak torque from 118.32&#xa0;N·m to 35.18&#xa0;N·m and decreases the torque ripple from 22.94% to 6.89%, without introducing any new pronounced high-order harmonic components. Consequently, a significant suppression of torque ripple is achieved while maintaining a high torque retention ratio.</p>

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Torque Ripple Mitigation of a Dual-Stator Permanent-Magnet Reluctance Motor Based on Halbach Arrays and Phase-Coordinated Selective Sequence Injection

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • Xiaoguang Kong,
  • Xiaonan Dong,
  • Chong Li

摘要

This study focuses on direct-drive applications that require low speed and high torque. A dual-stator permanent-magnet/reluctance synchronous machine is established, consisting of an interior reluctance rotor and an outer Halbach permanent-magnet rotor. Then finite-element analysis (FEA) with a unified mesh and time step is used to evaluate torque characteristics, followed by comparative analysis of three ripple-mitigation strategies: fundamental-component phase alignment, axial slot-skew averaging, and phase-coordinated selective sequence injection (PC-SSI). The results indicate that Halbach magnetization enhances the fundamental component of the outer air-gap flux density while suppressing inner-side leakage flux, thereby increasing the electromagnetic torque by approximately 14.6% compared with the radial-magnet arrangement under the same current excitation. Under identical finite-element computation settings, the proposed PC-SSI reduces the peak-to-peak torque from 118.32 N·m to 35.18 N·m and decreases the torque ripple from 22.94% to 6.89%, without introducing any new pronounced high-order harmonic components. Consequently, a significant suppression of torque ripple is achieved while maintaining a high torque retention ratio.