Application of Variable Structure Control in Suspension System

According to the magnetic suspension character of the rotor in the new type of gyro, the control mathematic model for the gyro´s rotor magnetic suspension system is founded. The system is characterized by its instability ´ nonlinearity. In this paper, a variable structure controller is designed. Based on the general variable structure controller theory, the design of switch function using the method of self-adapting configuring pole and the design of variable structure controller using trending law are discussed. At the same time, the switch surface of variable structure controller is designed by the method of self-adoptive configuring pole, so the performance quality of sliding mode is ensured. Accordingly, the variable structure controller, self-adaptive control and fuzzy control are organic combined. The simulating results show that the controller is characterized by fast dynamic respond, strong robust, according to the application in the rotor magnetic suspension system. The result show that the controller can guarantee every state parameter in the rotor magnetic suspension system to trend the designed value.