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Performance Evaluation of Induction Motors Under Optimal-Energy Control

This paper presents experimental results of a nonlinear torqueux optimal control for induction motor drives. This controller, minimizes the stored magnetic energy and the coil losses, while satisfying torque tracking control objectives [2]. The optimal control calculates and imposes time-varying (torque-reference depending) rotor ux norms. The controller is a cascadebased scheme with tree main loops: an inner high-gain current control loop that permits reduce the motor model into the reduced-order current-fed induction motor model; a middle loop for torque and ux tracking and an external loop for speed traking control; this control law guarantees the exponential stability of the closed loop system. Practical issues concerning timevarying rotor norm ux operation, stator current control and discrete-time implementation are presented. A comparative study in eÆciency and tracking performances is given between the proposed optimal control (time-varying rotor norm ux) and the classical Field-Oriented Control that operates with constant rotor ux norm.