Study On Control System Of Permanent Magnetic Synchronous Motor Based On H_∞ Control Theory

Permanent magnetic synchronous motor (PMSM) with its outstanding performance has been developed quickly and used widely in every field of industry. And rare earth which consist the permanent magnet is so rich in our country, so it is very important for us to research on the control strategy of PMSM.First of all, mathematical model of PMSM is presented after studying physical equations and equivalent circuits. And under the circumstance of MATLAB/Simulink, control system block of PMSM has been established. In order to prevent disturbance which caused by parametric uncertainties and load torque disturbance, this paper applied H_∞control theory to design of the controller of PMSM ,and designed an H_∞mixed sensitivity controller based on rotor field oriented vector control and H_∞state feedback controller based on feedback linearization. To the first strategy, this paper converted the control problem of Permanent Magnet Synchronous Motor to H_∞mixed sensitivity problem ,then through choosing suitable weighting functions to design H_∞controller. The simulation results show that the robust stability, tracking ability and the disturbance rejection performance of the PMSM control system with the robust controller are better than that of the system with PID controller. The second strategy use feedback linearization method to linearize the model of PMSM,then we applied H_∞robust Control strategy to the linearized model to design H_∞state feedback controller.the simulation results show that the strategy is efficient and effective...