Author(s): Priti P. Bhatkar, Alka Thakur
The paper proposes the stator resistance and machine speed estimation strategy based on rotor flux based MRAS in a systematic manner. This paper presents online method of estimating the stator resist ance of an induction motor inconjuction with the motor rotor speed to improve the performance of rotor field oriented control technique. Since stator resistance varies with temperature operating conditions, stable operation in low speed requires an appropriate on-line observer for the stator resistance. It enables the correct speed estimation and stable drive operation at low speed. The proposed parallel speed with stator resistance estimator is verified by MATLAB/SIMULINK simulation software. A simulation result shows the effectiveness, robustness and accuracy of the proposed method. Keywords: Induction motor, model reference adaptive control, stator resistance estimator, sensorless vector controls.