A new robust algorithm to improve the dynamic performance on the position control of magnet synchronous motor drive

Abstract

This paper puts forward a novel position controller based on active-disturbance rejection controller (ADRC) theory to ensure high dynamic performance of magnet synchronous motor (PMSM) servo system. By using the extended state observer (ESO), the position controller can accurately estimate the derivative signals and precise decoupling of PMSM is achieved. In addition, the proposed strategy realizes the disturbance compensation without accurate knowledge of PMSM parameters. By means of the tracking differentiator (TD) and nonlinear state error feedback control law (NLSEF), the PMSM servo system realizes nonlinear control, that is, if the error is smaller, then the gain is bigger, or vice versa. The simulation results show that the proposed controller ensures good robustness and adaptability under modeling uncertainty and external disturbance. It is concluded that the proposed topology produces better dynamic performance, such as small overshoot and fast transient time, than the conventional proportional/integral/derivative (PID) controller in its overall operating conditions.