Research on High Precision PMSM Servo System Based on Improved Active Disturbance Rejection Controller

Abstract

The servo system of the electromagnetic rail gun is a permanent magnet synchronous motor (PMSM) servo system, which is critical to the electromagnetic rail gun's firing rate, firing accuracy, and stability. Whereas, the classical PID controller cannot provide the high precision control of the electromagnetic rail gun, when it is fired with strong impact disturbance and large changes of nonlinear disturbance. Consequently, this paper examines the control strategy for the electromagnetic rail gun servo system, and develops an improved active disturbance rejection controller (ADRC), which based on the super-twisting sliding mode (STSMC) algorithm. The ADRC can suppress the system disturbance by estimating the “total disturbance”, and the STSMC algorithm can ameliorate the jitter phenomenon of the ordinary sliding mode algorithm. Accordingly, this paper incorporates the STSMC algorithm into ADRC to further enhance the anti-disturbance performance and dynamic characteristics of the PMSM servo system. The simulation results demonstrate that the improved ADRC has apparent superiority compared with the traditional PID controller. And it can successfully enhance the dynamic performance and anti-disturbance performance of the PMSM servo system.