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Non-Fragile H_∞ Speed Servo Control Based on Delta Operator for Permanent Magnet Linear Synchronous Motors

Lin Ruiquan Yang Fuwen (Fuzhou University Fuzhou 350002 China)  
Focused on the parameters excursions of controller, a control strategy of non-fragile H_∞ control based on Delta operator theory for PMLSM is illustrated in this paper.Then the characteristics of the designed controller is compared with that of the controllers which are designed with Z transform method and continous model. Through the analysis of closed-loop pole, the results show that the Delta operator control system is stable and of the expected H_∞ performance,it also can implement exactly tracking and reject the interference effectively in the case of fast sampling even if the parameters of the controlled object are of variations, while the Z transformation control system will be unstable. The results also show that when the sampling time is reduced to zero, the trend of the parameters of the designed controller based on Delta operator theory towards that based on continous model.
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