Variable Structure Control of A Maglev System Based on Linear Quadratic Regulator

Based on the fact that the magnetic levitation system is nonlinear and sensitive, a robust control strategy which is composed of the optimal linear quadratic regulator (LQR) and the sliding mode control is presented. The LQR design makes sure the system performance index is satisfied, while the sliding mode control restrains the disturbance exterior, as well as makes sure fast dynamical response. The strategy solves the conflict between system dynamical performance, robustness and static performance. The controller is easy to design and realize. Simulation and experiment results demonstrate the system has fast dynamical response and is insensitive to disturbance out of the system.