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<p>This paper gives an overview of some important issues that have to be addressed in permanent magnet synchronous motor (PMSM) speed control using sliding mode control (SMC): chattering, convergence speed, and singularity issues. Terminal SMC (TSMC) suffers from chattering and slow convergence, where control precision can be seriously affected in the case of sudden changes in the load. Therefore, to overcome such limitations, here a novel SMC featuring a new reaching law for chattering elimination and faster convergence is designed. A newly designed sliding surface further speeds up the convergence of state variables to the sliding surface while reducing singularity problems commonly found in conventional SMCs. Besides, a sliding mode observer (SMO) is proposed to estimate the load torque precisely, which is fed back to the SMC to enhance robustness against abrupt load fluctuations. Experimental tests validate the effectiveness and robustness of the proposed control method showing a high improvement in performances in a wide range of load conditions.</p>

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A finite-time speed control method for permanent magnet synchronous motor drives based on sliding mode control and estimation theory

  • 期刊论文

  • 发表日期：

    2025年2月23日

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  • Kangmin Shao

摘要

This paper gives an overview of some important issues that have to be addressed in permanent magnet synchronous motor (PMSM) speed control using sliding mode control (SMC): chattering, convergence speed, and singularity issues. Terminal SMC (TSMC) suffers from chattering and slow convergence, where control precision can be seriously affected in the case of sudden changes in the load. Therefore, to overcome such limitations, here a novel SMC featuring a new reaching law for chattering elimination and faster convergence is designed. A newly designed sliding surface further speeds up the convergence of state variables to the sliding surface while reducing singularity problems commonly found in conventional SMCs. Besides, a sliding mode observer (SMO) is proposed to estimate the load torque precisely, which is fed back to the SMC to enhance robustness against abrupt load fluctuations. Experimental tests validate the effectiveness and robustness of the proposed control method showing a high improvement in performances in a wide range of load conditions.