Application of Linear Active Disturbance Rejection Controller for Sensorless Control of Internal Permanent-Magnet Synchronous Motor

In this paper, a linear active disturbance rejection controller is applied for sensorless control of internal permanent-magnet synchronous motors. A hybrid position estimation strategy combining the high-frequency (HF) current injection for low-speed region with the electromotive force (EMF) estimation for high-speed region is presented. In contrast to conventional hybrid methods, the two schemes were integrated into the same control structure, and the position observer is embedded into the current controller. The high performance of position estimation was achieved using line extended state observers (ESOs). Compared with conventional sliding-model observer, the phase delay and speed chattering was obviously reduced. The robustness of the hybrid sensorless control system was well performed in the full-speed range. Experimental results were presented to verify the application of proposed method.