An improved siding mode controller in PMSM control system for smoother speed response and stronger robustness

The PI controller in the Permanent Magnet Synchronous Motor (PMSM) control system has the disadvantages of weak robustness and poor anti-interference ability, therefore the Sliding Mode Control (SMC) is proposed to improve the control effect and enhance the robustness of the system. However, the switching control part in the design of the traditional sliding mode controller is usually switched by the sign function, which can make the chattering phenomenon arise in the system. In order to reduce the chattering and further improve the control performance of the PMSM, a saturation function was proposed in this paper to replace the sign function to reduce the chattering phenomenon on the sliding surface. The simulation results obtained in the Matlab/Simulink show that the improved sliding mode controller can improve both the dynamic performance and anti-interference ability of the PMSM control system.