Cascade sliding mode control of a field oriented induction machine drive

This study deals with the application of sliding mode control theory to ind uction machine fed by a PWM voltage source inverter in which the system ope rates in the field oriented control. Thus, after determining the decoupled model of the machine, a set of simple surfaces have been applied to a casca de structure and the associated control laws have been synthesized. Further more, in order to reduce chattering phenomenon, smooth control functions wi th appropriate threshold have been chosen. Simulation study is conducted to show the effectiveness of the proposed method and then validated by an exp erimental prototype.