High Precision Robust Controller Design for PMSM Servo System with Multi-operating-points

In this paper we propose a high precision robust controller design method for surface mounted PMSM servo system. Feedback linearization method is first applied to transfer the motor plant into a linearized model with an equivalent disturbance. Then a robust controller is designed to compensate the equivalent disturbance. Although some parameters of the control system may deviate seriously from the nominal value when the environment changes, they have relativity. We set up multi-operating-point model to reduce the conservation. Robust properties of the closed-loop system are proven and simulation results are shown.