Research and design of the compound control system of an AC servo system

A novel compound control scheme for AC servo system with PD and sliding mode variable structure control is presented, which integrates advantages of sliding mode variable structure control and traditional PID control. It makes that AC servo system has excellent robust of variable structure control. Mathematical model of AC servo system is deducted, regulator of three closed loop is designed. The simulation and comparison show that regulator can improve the dynamic and static performance and the robustness.