Sensorless control of IM based on full-order Luenberger observer

Accurate knowledge of most parameters is important for prices modelling and corrects operation of a number of induction motor control schemes. Stable and accurate operation of control scheme requires an appropriate on-line identification algorithm for the rotor resistance and considering of core loss. In this paper, we propose a full-order flux observer with adaptive speed loop, while core loss and rotor resistance are estimated. In order to derive the adaptation laws, a Lyapunov function is introduced. Theoretical analysis and simulation results show that estimated rotor and core loss resistances converge to actual values. Furthermore, flux and rotor speed are estimated and controlled successfully.