Study on robustness-tracking control for linear servo system

A robustness-tracking control scheme based on combining H/sub /spl infin// robust and sliding mode control for a permanent-magnet linear motor is presented in this paper. The control scheme solves the conflict between tracking and robustness of the linear servo motor. The sliding mode tracking controller is designed to ensure the system have fast tracking characteristic to the command. While the H/sub /spl infin// robustness controller can suppress the disturbances within the close loop greatly, and can effectively minimize the chattering of sliding mode control which could influence the steady state performance of the system. The simulation results show that this control scheme not only can enhance the track-command-ability and the robustness of the linear servo system, but also has strong robustness to parameter variations and resistance disturbances.