Research on Speed Observer of PMSM Servo System
The incremental optical encoder is widely used in PMSM servo system for speed detection. However, this method is detected the average speed, which will cause delay time, and make the speed control system unstable at low speed range. A speed observer was designed in this paper, which is combining state observer and Kalman filter to estimate instantaneous speed. Simulation results show that this method can improve the speed detection accuracy of the PMSM servo system.
R. N. Huang et al., "Research on Speed Observer of PMSM Servo System", Advanced Materials Research, Vols. 317-319, pp. 1223-1227, 2011