Apaptative high gain observer based a sensorless output feedback controller for IMs with time-varying load torque and rotor resistance

This work highlights the link between the accurate knowledge of some critical parameters, such as rotor resistance and load torque, and its important role in correct speed sensorless induction motor control. Indeed, the main characteristics of the output feedback predictive controller lie in the fact that their design is made by exploiting on-line the model at each sampling instant. In the spirit to achieve high performance control, the incorporation of an observer is proposed for recovering online all machine variables (the internal states and time varying parameters). Simulation results for IMs are addressed to show the effectiveness of the control design method.