Sensorless control of synchronous reluctance drive based on extended back electromotive force model

This paper presents an overview and systematic analysis of various design methods for obtaining the observer corrective action gains for stable and precise estimation of synchronous reluctance motor speed. The structure of the reduced order observer consider stator current and extended back electromotive force vectors as observer state variables in stationary reference frame and utilize robust correction mechanism for speed estimation of synchronous reluctance motor. The effect of change in machine inductances on observer estimation accuracy is also discussed. Evaluation is given through simulation results of considered synchronous reluctance motor drive.