Sensorless decoupling control of induction motors for high dynamic performance

In this paper, we attempt to control induction motors with a sensorless control scheme as well as high dynamic performance by means of decoupling of motor speed and rotor flux. Thus, the rotor flux is firstly estimated with the improved rotor flux observer and the feedback linearization theory is used to decouple the rotor speed and flux amplitude. Then, the speed of the induction motor is estimated by a speed observer. The induction motor with the proposed controller possesses the input-output dynamic characteristics of a linear system such that the rotor speed (or motor torque) and the rotor flux are decoupled in the high or low speed range. Some simulation and experimental results are presented to demonstrate the practical significance of our results