Nonlinear sliding-mode control for permanent magnet synchronous machine

This paper will compare properties of Sliding Mode Controllers and classical Proportional Integral controller for permanent magnet synchronous machines. PI controller is simple but sensitive to parameter variations and external disturbance. Due to this reasons, Sliding Mode Control technique is proposed in this paper. This control technique works against parameters variations and external disturbances, and also its ability in controlling linear and nonlinear systems. The reaching law of Sliding Mode Control increases the reaching speed when the state is far away from the switching manifold, but reduces the rate when the state is near the manifold. The control scheme is validated through a set of simulations on a Matlab/Simulink package. The simulation results show that the Fast Terminal Sliding Mode Controller realized a good dynamic behavior of the motor with a rapid rise time and settling time, and had better performance than the simple Sliding Mode Controller and PI controller.