Simulation of Sliding Mode Control for PMSM on Account of Variable Exponential Approach Law

Aiming at such control requirements of the permanent magnet synchronous motor (PMSM) as smooth accurate speed regulation and anti-interference in integrated injection molding machine, a SMC method on account of variable exponential approach law is put forward in this paper. It is applied to the speed loop of the PMSM servo system. Firstly, the sliding mode speed controller on account of variable exponential approach law is design. Then, the sliding mode speed controller of PMSM servo system is implemented. Finally, the simulation is performed by MATLAB. The simulation results prove that the method is more effective and suppresses the chattering of sliding mode control, improving the dynamic quality and robustness of the PMSM servo system.