Time-varying sliding mode control of permanent magnet synchronous motor based on improved integral sliding mode
In order to improve the control performance of permanent magnet synchronous motor and im-prove the control method of the motor,the integrated sliding mode control of permanent magnet synchro-nous motor was studied. Firstly,the problem that the integrated sliding mode control is easy to produce speed overshoot after encountering unknown interference during operation was proposed. Then,the over-shoot caused by integral accumulation during operation was eliminated by defining the initial integral val-ue of self-regulation,the problem speed overshoot was improved. Secondly,in order to improve the con-vergence of sliding mode control in the global stage of the whole stage of the motor operating,a time-var-ying sliding mode control based on predictive control that optimized online was proposed. The optimal slid-ing mode surface at the current moment was selected through predictive control variables,so that the state variables can converge to the sliding mode surface faster,further reduce the speed error,and improve the control accuracy and control speed of the system. Finally,an extended state observer was built to observe the unknown interference of the system,compensate the controller,and improve the robustness of the whole control system. The effectiveness of the proposed method was verified by simulation and experiment.
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