volume | PIER Journals

Abstract

To enhance the speed control performance of permanent magnet synchronous motor (PMSM) drive systems, a novel sliding mode control (SMC) strategy based on a new fuzzy exponential reaching law (NFERL) is proposed. The law enhances the traditional exponential reaching law by introducing a system-state-dependent power term and a fuzzy term that adapts the reaching speed based on the sliding mode function. A hyperbolic tangent function replaces the high-frequency switching term to suppress chattering. This control strategy helps reduce current ripples and torque pulsations, and improves the stability and response speed of system operation. Additionally, to address the issue that the system is susceptible to unknown disturbances, a sliding mode disturbance observer (SMDO) is designed to estimate the total disturbance of the system, and the estimated disturbance is fed forward into the composite speed controller. Finally, the introduced control strategy is validated using MATLAB/Simulink simulations and a motor experimental platform. Both simulated and experimental results demonstrate that the new reaching law effectively reduces the startup speed overshoot of the PMSM compared to the traditional law, while also achieving faster convergence, reduced chattering, and superior anti-disturbance performance.

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Professor Zhonggen Wang

Dr. Jinpeng Ma

Professor Wenyan Nie