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<p>In response to the growing demands for power density, fault tolerance, and operational stability of motor drive systems in industrial manufacturing, aerospace, and other high-end fields, traditional three-phase permanent magnet synchronous motor (PMSM) drive systems face inherent limitations: constrained DC bus voltage, high cost of fault-tolerant structures, and the large volume/complexity of twelve-switch inverters due to excessive switching devices. To address these issues, this study proposes a drive scheme combining a nine-switch converter (NSC) and a dual three-phase PMSM (DTP-PMSM). The research focuses on system control, modulation strategies, and harmonic suppression, with feasibility verified experimentally. First, the mathematical models of DTP-PMSM and NSC were established based on the harmonic subspace of vector space decomposition (VSD), clarifying the influence mechanism of stator current components on electromagnetic torque and its ripple. Second, to tackle the complex switching constraints of NSC, an equivalent model was constructed based on virtual legs, and an innovative space vector pulse width modulation (SVPWM) strategy adapted to DTP-PMSM was proposed. By optimizing voltage vector selection through sector classification, the computational complexity was significantly reduced. Third, the generation mechanisms of spatial and temporal harmonics in the system were analyzed, and a multi-proportional integral resonant (PIR) controller was designed to suppress 6th, 12th harmonics, and their specific harmonic bands, overcoming the weak harmonic suppression capability of traditional PI controllers. Finally, an experimental platform was built to conduct dynamic response and harmonic suppression tests. Results indicate that: (1) Compared with the traditional twelve-switch inverter, the NSC reduces switching devices by 25% (from 12 to 9) while retaining the independent control capability of dual three-phase windings; (2) at a speed of 300 rpm, the multi-PIR controller achieves a suppression rate of over 60% for 5th, 7th, 11th, and 13th harmonic currents, and the total harmonic distortion (THD) of stator current decreases from 28.7% (PI control) to 11.2%; (3) the system response time is less than 0.8 s during sudden changes in speed or torque. This scheme improves power density while ensuring the stability and efficiency of DTP-PMSM operation, providing a novel technical pathway for high-performance motor drive systems in demanding scenarios.</p>

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Research on control scheme of dual three-phase permanent magnet synchronous motor driven by nine-switch converter

  • 期刊论文

  • 发表日期：

    2026年3月17日

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  • Siyu Huang,
  • Pan Wang,
  • Changbin Guo,
  • Bingle Liu,
  • Jie Gan,
  • Hu Xu

摘要

In response to the growing demands for power density, fault tolerance, and operational stability of motor drive systems in industrial manufacturing, aerospace, and other high-end fields, traditional three-phase permanent magnet synchronous motor (PMSM) drive systems face inherent limitations: constrained DC bus voltage, high cost of fault-tolerant structures, and the large volume/complexity of twelve-switch inverters due to excessive switching devices. To address these issues, this study proposes a drive scheme combining a nine-switch converter (NSC) and a dual three-phase PMSM (DTP-PMSM). The research focuses on system control, modulation strategies, and harmonic suppression, with feasibility verified experimentally. First, the mathematical models of DTP-PMSM and NSC were established based on the harmonic subspace of vector space decomposition (VSD), clarifying the influence mechanism of stator current components on electromagnetic torque and its ripple. Second, to tackle the complex switching constraints of NSC, an equivalent model was constructed based on virtual legs, and an innovative space vector pulse width modulation (SVPWM) strategy adapted to DTP-PMSM was proposed. By optimizing voltage vector selection through sector classification, the computational complexity was significantly reduced. Third, the generation mechanisms of spatial and temporal harmonics in the system were analyzed, and a multi-proportional integral resonant (PIR) controller was designed to suppress 6th, 12th harmonics, and their specific harmonic bands, overcoming the weak harmonic suppression capability of traditional PI controllers. Finally, an experimental platform was built to conduct dynamic response and harmonic suppression tests. Results indicate that: (1) Compared with the traditional twelve-switch inverter, the NSC reduces switching devices by 25% (from 12 to 9) while retaining the independent control capability of dual three-phase windings; (2) at a speed of 300 rpm, the multi-PIR controller achieves a suppression rate of over 60% for 5th, 7th, 11th, and 13th harmonic currents, and the total harmonic distortion (THD) of stator current decreases from 28.7% (PI control) to 11.2%; (3) the system response time is less than 0.8 s during sudden changes in speed or torque. This scheme improves power density while ensuring the stability and efficiency of DTP-PMSM operation, providing a novel technical pathway for high-performance motor drive systems in demanding scenarios.