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<p>This paper proposes a simplified dual torque control scheme based on instantaneous reactive power theory for induction motor (IM) drive systems, to improve transient and steady-state performances. Replacing the inner-loop current control of field-oriented control (FOC) with direct electromagnetic/reactive torque control, the scheme overcomes the current loop bandwidth limitation and accelerates dynamic response of FOC. It suppresses cross-time-scale coupling-induced torque ripples via fast/slow variable layered control, where the speed and flux linkage are slow variables and the normalized electromagnetic and reactive torque are fast variables, and enhances decoupling performance. A novel feedback gain matrix is integrated to solve full-order observer low-speed instability. Experimental results confirm that the proposed scheme outperforms FOC in dynamic, steady-state, and decoupling performances, ensures stable low-speed IM operation, and verifies sensorless speed control feasibility.</p>

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Dual-torque control for sensorless induction motor drives

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Jianfei Dou,
  • Pingping Gong,
  • Yiwen He,
  • Chengming Feng

摘要

This paper proposes a simplified dual torque control scheme based on instantaneous reactive power theory for induction motor (IM) drive systems, to improve transient and steady-state performances. Replacing the inner-loop current control of field-oriented control (FOC) with direct electromagnetic/reactive torque control, the scheme overcomes the current loop bandwidth limitation and accelerates dynamic response of FOC. It suppresses cross-time-scale coupling-induced torque ripples via fast/slow variable layered control, where the speed and flux linkage are slow variables and the normalized electromagnetic and reactive torque are fast variables, and enhances decoupling performance. A novel feedback gain matrix is integrated to solve full-order observer low-speed instability. Experimental results confirm that the proposed scheme outperforms FOC in dynamic, steady-state, and decoupling performances, ensures stable low-speed IM operation, and verifies sensorless speed control feasibility.