Design of H∞ feedback controller and IP-position controller of PMSM servo system

Using H_∞ control theory to design feedback controller can enhance the anti-disturbance capability and servo precision of AC permanent magnetic servo motor. Consequently, the system robustness can be ensured even with the existence of model perturbations and external disturbance. H_∞ feedback controller design using robust control theory can be a guarantee of system robustness when the control object is subject to model perturbations and external disturbances. Compared with traditional PI-controller, IP-controller can increase response speed and meet the desired position of the system more accurately. Both the H_∞ feedback controller design to elevate the operation precision and the design approach for IP-controller is discussed in this paper.