Fast Nonsingular Terminal Sliding-Mode with Disturbance Observer Control of PMSM Drive System

Abstract

Traditional PI control of permanent magnet synchronous motor (PMSM) system cannot solve the contradiction between fastness and stability, and have poor anti-disturbance ability. In order to solve these problems, a fast nonsingular terminal sliding-mode (FNTSM) surface function is proposed based on the traditional nonsingular terminal sliding-mode (NTSM) control, and theoretical analysis proves that the FNTSM surface function has faster dynamic response and more finite time convergence. In addition, in order to deal with the inherent chattering phenomenon caused by the high sliding-mode switching gain, a FNTSM control with disturbance observer is designed. Through comparative experiment results with traditional PI control, it is proved that the FNTSM with disturbance observer method designed in the article improves the dynamic quality of the system and has better disturbance ability.