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This paper investigates the low-harmonic operation characteristics of a dual three-phase permanent magnet synchronous motor (DTP-PMSM) under open-phase fault conditions in a shaftless propulsion system. First, a six-dimensional mathematical model is established to derive the magnetomotive force (MMF) reconstruction equations under fault conditions. Then, a fault-tolerant control strategy based on constant total MMF is proposed, where an optimal current fault-tolerant control method is adopted to reconstruct the circular rotating MMF after an open-phase fault. Finally, a quasi-proportional resonant (QPR) controller is employed to achieve dual suppression of current harmonics and torque ripple during fault-tolerant operation. Experimental results demonstrate that under the proposed control strategy, the system maintains 57.7% of its load capacity with a total current harmonic distortion (THD) of 2.47% and a torque ripple of 8.24% during open-phase fault conditions.

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Low-Harmonic Fault-Tolerant Control Strategy for Dual Three-Phase Permanent Magnet Synchronous Machines

  • 会议论文

  • 发表日期：

    2026年

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  • Hanning Qian,
  • Zhaolong Sun,
  • Fengrui Cui,
  • Renjun Dian,
  • Junhe Zhang

摘要

This paper investigates the low-harmonic operation characteristics of a dual three-phase permanent magnet synchronous motor (DTP-PMSM) under open-phase fault conditions in a shaftless propulsion system. First, a six-dimensional mathematical model is established to derive the magnetomotive force (MMF) reconstruction equations under fault conditions. Then, a fault-tolerant control strategy based on constant total MMF is proposed, where an optimal current fault-tolerant control method is adopted to reconstruct the circular rotating MMF after an open-phase fault. Finally, a quasi-proportional resonant (QPR) controller is employed to achieve dual suppression of current harmonics and torque ripple during fault-tolerant operation. Experimental results demonstrate that under the proposed control strategy, the system maintains 57.7% of its load capacity with a total current harmonic distortion (THD) of 2.47% and a torque ripple of 8.24% during open-phase fault conditions.