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Sliding Mode-H_∞ Robustness Tracking Control for Permanent Magnet Linear Synchronous Motors

Tian Yanfeng Guo Qingding(Shenyang University of Technology Shenyang 110023 China)  
A robustness-tracking control scheme based on combining H∞ robust control and sliding mode control for permanent-magnet linear synchronous motor(PMLSM) is presented in this paper to solve the conflict between tracking and robustness of the linear servo system. The sliding mode tracking controller is designed to ensure that the system has fast tracking characteristic. While the H∞ robustness controller can suppress the disturbances within the close loop(including the load and the end effect force of linear motor etc.) greatly, and can effectively minimize the chattering of sliding mode control which could influence the steady state performance of the system. Some simulation results show that this control scheme not only can enhance the track-command-ability, but also has strong robustness to parameter variations and resistance disturbances.
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