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The authors present a method for estimating simultaneously the motor speed and the rotor resistance of an induction motor by superimposing AC components on the field current command. In addition, a rotor resistance adaptive scheme is proposed in order to decouple the rotor resistance adaptation with the motor speed variation. The validity of the proposed method has been verified by simulation.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Kubota et al. (2002) studied this question.