A sliding mode flux observer for predictive torque controlled induction motor drive

Abstract

Predictive torque control for induction motor is a control strategy uses the model of the motor drive and an appropriate cost function to directly control torque and flux. This strategy is easy to implement but depends upon parameters of motor drive. This paper presents the design and analysis of a sliding mode flux observer to improve the parameter robustness. The observer estimates the stationary reference frame flux of the induction motor by using sliding mode terms based on the current mismatches and flux mismatches. The novelty is the method use the current mismatches to estimate the flux mismatches in the situation when the real fluxes is not available. Simulations presented in this paper prove the sliding mode observer improve the parameter robustness of predictive torque controlled induction motor drive.