Speed sensorless field-orientation control of the induction machine

Abstract

We propose a speed estimation method for an induction machine and its application to the flux observer-based field-orientation (FOFO) control system, which we proposed previously. The motor speed is estimated based on the difference between two flux estimators. We analyze its convergence performance and propose the novel pole assignment method. Next, we apply this speed estimator to the FOFO controller. We implement the system centered about the DSP, and through some laboratory experiments, we will show that the speed sensorless FOFO operates with enough stability and has a strong robustness to rotor resistance variation. © 1993 IEEE