To address the issues of buffeting and slow response in the sliding mode control system of surface mounted permanent magnet synchronous motors,a control strategy combining a novel sliding mode controller with an improved sliding mode observer was proposed.A new approach law was introduced,utilizing the tanh function as the switching function to ensure smoother transitions.Fur-thermore,the incorporation of a terminal attractor was aimed at enhancing system convergence speed and improving control quality.An improved sliding mode observer was designed to replace the symbol function with a continuous function,compensating for observation errors,reducing buffeting effects,and enhancing observation accuracy.A simulation model of a double closed-loop speed control sys-tem based on the new sliding mode controller and improved sliding mode observer was established,and comparative simulation experi-ments were conducted with a proportional-integral control system and a sliding mode control system based on an exponential reaching law.The simulation results indicate that the proposed control strategy effectively reduces buffeting effects,improves system conver-gence,and enhances the ability to track desired signals.
permanent magnet synchronous motorsliding-mode controlsliding mode observernew approach lawcompound control
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