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An Online Simplified Rotor Resistance Estimator for Induction Motors

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5 Author(s)
Kenne, G. ; Dept. de Genie Electr., Univ. de Dschang, Bandjoun, France ; Simo, R.S. ; Lamnabhi-Lagarrigue, F. ; ArzandeĢ, A.
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This brief presents an adaptive variable structure identifier that provides finite time convergent estimate of the induction motor rotor resistance under feasible persistent of excitation condition. The proposed rotor resistance scheme is based on the standard dynamic model of induction motor expressed in a fixed reference frame attached to the stator. The available variables are the rotor speed, the stator currents and voltages. Experiments show that the proposed method achieved very good estimation of the rotor resistance which is subjected to online large variation during operation of the induction motor. Also, the proposed online simplified rotor resistance estimator is robust with respect to the variation of the stator resistance, measurement noise, modeling errors, discretization effects and parameter uncertainties. Important advantages of the proposed algorithm include that it is an online method (the value of Rr can be continuously updated) and it is very simple to implement in real-time (this feature distinguishes the proposed identifier from the known ones).

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Control Systems Technology, IEEE Transactions on  (Volume:18 ,  Issue: 5 )