PMSM Speed Regulation System using Non-Linear Control Theory

This paper investigates the speed regulation problem of permanent magnet synchronous motor servo system based on terminal sliding mode control method. By giving a non-singular terminal sliding mode manifold, a novel terminal sliding mode controller is designed for the speed loop. The controller can make the states not only reach the manifold in finite time, but also merge to the equilibrium point in finite time. so, the controller would make the motor speed reach the reference value, obtaining a faster convergence and a better tracking precision. In the same way, considering the large chattering phenomenon caused by high switching gains, composite terminal sliding mode control method based on disturbance observer is proposed inorder to minimize chattering. Through disturbance estimation for feed-forward compensation, the terminal sliding mode controller may take a smaller value for the switching gain without sacrificing disturbance rejection performance.