A sensorless IM adaptive feedback linearization control with core loss and rotor resistances estimation

In this paper, a sensorless induction motor drive based on the adaptive feedback linearization control is presented, while core loss and rotor resistances are estimated. A nonlinear observer is developed to estimate the dq fluxes and rotor speed, in addition to rotor and core loss resistances. Adaptive feedback linearization control is used to track the reference speed. In order to derive the adaptation laws, a Lyapunov function is introduced. Theoretical analysis and simulation results show that estimated rotor and coreloss resistances converge to actual values, if persistent excitation condition is satisfied. Furthermore, flux, electromagnetic torque, and rotor speed are estimated and controlled successfully.