Design and Simulation of a Discrete Time Variable Structure Controller for a Brushless DC Motor Drive

In this paper the design of a discrete time variable structure controller(VSC) for a brushless DC motor drive (BLDCM) position servo system is introduced.Simulation results show that the VSC has perfect control performance and is insensitive to the parameter varation of controlled object and outside disturbance,and that the system state will change according to predetermined path,so the servo system has snch advantages as high stability,high accuracy?robustness and fast response.