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<p>When a permanent magnet synchronous motor (PMSM) operates at high speed with a low carrier frequency ratio (CFR), current coupling and control delay can severely compromise control stability and dynamic response, potentially leading to system instability under extreme conditions. To address these challenges, this paper first investigates the current coupling mechanism considering the impact of control delay, unveiling the deeper mathematical structure and dynamic characteristics of the control system. A precise discrete domain high-speed motor model is reconstructed, and by introducing internal model control (IMC) theory, a system impedance gain modulation loop is designed. A digital current controller with enhanced decoupling capability has been developed, which extends the operational speed range of high-speed motors and improves control response under low CFR conditions. Finally, based on a high-speed prototype, dynamic speed variation experiments across a wide speed range of 0–60,000 r/min are conducted, validating the feasibility and superiority of the proposed approach.</p>

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Research on robust digital decoupling control for high-speed permanent magnet synchronous motors under low carrier frequency ratio conditions

  • 期刊论文

  • 发表日期：

    2026年1月13日

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  • Weimin Li,
  • Qixing Gao,
  • Yilong Hu,
  • Jiaming Ye,
  • Jiafan Shen

摘要

When a permanent magnet synchronous motor (PMSM) operates at high speed with a low carrier frequency ratio (CFR), current coupling and control delay can severely compromise control stability and dynamic response, potentially leading to system instability under extreme conditions. To address these challenges, this paper first investigates the current coupling mechanism considering the impact of control delay, unveiling the deeper mathematical structure and dynamic characteristics of the control system. A precise discrete domain high-speed motor model is reconstructed, and by introducing internal model control (IMC) theory, a system impedance gain modulation loop is designed. A digital current controller with enhanced decoupling capability has been developed, which extends the operational speed range of high-speed motors and improves control response under low CFR conditions. Finally, based on a high-speed prototype, dynamic speed variation experiments across a wide speed range of 0–60,000 r/min are conducted, validating the feasibility and superiority of the proposed approach.