Improved Model - Free Sliding Mode Control Of PMSM Based On Finite-Time Generalized Proportional Integral Observer

Aiming at the problems of poor control performance and poor anti-interference performance of PMSM control system due to external load disturbance, model and parameter uncertainty, a composite control method of PMSM based on improved model-free sliding mode control is proposed. Firstly, the ultra-local model of PMSM system without considering motor parameters is established. Then, a model-free single-loop sliding mode speed controller is designed according to the ultra-local model of the system. Furthermore, for the total disturbance of the system, a finite-time generalized proportional integral observer (FT-GPIO) is established, which can estimate the total disturbance of the system more accurately and stably, and perform feedforward compensation to update the control information in real time. Finally, compared with the traditional control method, the simulation results show that the proposed control method has good dynamic performance, anti-interference ability and steady-state control accuracy.