High-performance robust speed-flux tracking controller for induction motor

A new design strategy is proposed for the development of full-order indirect field-oriented induction motor controller. The proposed output feedback controller permits to achieve global exponential asymptotic speed and flux tracking in presence of unknown load torque. In addition, it ensures asymptotic decoupling of the speed and flux subsystems, asymptotic linearization of the speed subsystem and improved robustness with respect to rotor resistance variation, providing improved energy efficiency. The limited implementation complexity, joined to a simple procedure for performance specification and controller parameters' tuning, makes the proposed controller suitable for industrial application. Simulation results are presented, confirming excellent tracking quality and robustness. The proposed non-linear controller and the adopted design procedure are suitable for both further theoretical development (robust and adaptive control) and industrial applications where high dynamic performance is required. Copyright (C) 2000 John Wiley & Sons, Ltd.