Speed and efficiency control of induction motors via asymptotic decoupling

An attempt is made to control induction motors with high power efficiency as well as high dynamic performance by utilizing recently developed nonlinear feedback control techniques. The controller consists of three subcontrollers: a saturation current controller, a decoupling controller, and a well-known flux simulator. The decoupling controller decouples rotor speed (or motor torque) and rotor flux linearly. The controller does not need the transformation between a d-q synchronously rotating frame and an x-y stator-fixed frame. It is computationally quite simple and does not depend on the rotor resistance, which varies widely with the machine temperature. Performance analysis and simulation results are presented