Research on H infinity Robust Tracking Controller for Permanent Magnet Synchronous Motor Servo System

For the high precision permanent magnet synchronous motor (PMSM) servo system, on the basis of analysis of the servo system performance, an H_∞ robust control strategy is proposed. H_∞ robust controller used as a feedback controller to compensate for the current-loop. The current-loop can be compensated timely when the external disturbances such as end-effect and load disturbances of PMSM mutating, so the system´s strong robustness is ensured. The simulation results show that the H_∞ robust control strategy implements perfect tracking and has strong robustness.