Abstract
This paper presents a H/sub /spl infin// speed controller based on internal model theory. The output point mixed sensitivity method is adopted to restrain the disturbance of servo system and guarantee the robust stability. A proximate internal model is introduced into disturbance path when solving the standard H/sub /spl infin// control problem. It can simplify the design and satisfy the requirement of servo performance. A H/sub /spl infin// load disturbance observer is designed which achieves the disturbance cancellation and guarantees robust stability. Simulation results show that the system has improved performance by the methods proposed in this paper.
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