Sampled-data based output tracking H ∞ control for PMSM servo system

In this paper, a sampled-data based output tracking H ∞ controller is designed for the permanent magnet synchronous motor (PMSM) servo system. Firstly, the stator voltage is used as the control input of the PMSM servo system, and the motor speed is used as the output of this servo system. The mathematical model of PMSM servo system is established. Then, a sampled-data state feedback controller is designed such that the motor speed can track a given reference signal. In order to solve this problem, the sampled-data H ∞ performance index of output tracking is defined. The problem of output tracking is transformed into the problem of sampled-data based H ∞ control problem. Finally, simulation results show the feasibility and effectiveness of this controller design method.