New Sliding-Mode Observer for Induction Machine in Electric Propulsion Applications.

The performance and efficiency of an induction motor drive system can be enhanced by online estimation of the critical parameters, such as the rotor time constant and stator resistance. A novel sliding mode observer with parameter identification is proposed in this paper to compensate the parameter variation effects. The (SMC) technique finds its stronger justification in the utilization of a robust nonlinear control law to model uncertainties. The used control algorithm is a sliding mode associated with a particular function "sat" to limit chattering effects that presents a serious problem in applications to variable structure systems such as electric propulsion. The observer is simple and robust, and suitable for online implementation for EV application. Simulation tests under load disturbances and parameter uncertainties are provided to evaluate the consistency and performance of the proposed control technique. [ABSTRACT FROM AUTHOR]