Sensorless Decoupling Control of Induction Motors Based on Feedback Linearization

A new sensorless decoupling control technique is proposed to control the induction motor via feedback linearization theory in this paper. The induction motor with our 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. Thus, the rotor flux responses are not affected by abrupt changes in the rotor speed and vice versa. In order to obtain good dynamic performance of the sensorless control scheme at low speed range, the improved rotor flux estimator in this paper can be compensated from the effects of offset errors on integral. Furthermore, the suggested control strategy and estimation method have been validated by simulation study and experimental results