Rotor resistance estimation for current-fed induction motors
Abstract
In this paper a new algorithm for estimating the rotor resistance of current-fed induction motors is presented. The proposed method does not require persistent excitation and achieves asymptotic convergence even in the case of zero rotor speed and/or low torque. However, it does require measurement of the rotor speed and flux. To make the scheme practically feasible, a method for estimating the rotor flux is devised. The proposed estimator is combined with an indirect field-oriented control law to achieve torque/speed regulation in the absence of rotor resistance and load torque information. The efficacy of the resulting adaptive output feedback control scheme is tested via simulations.
