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A new stator resistance tuning method for stator-flux-oriented vector-controlled induction motor drive

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3 Author(s)
Mitronikas, E.D. ; Dept. of Electr. & Comput. Eng., Patras Univ., Greece ; Safacas, A.N. ; Tatakis, E.C.

Field-oriented-controlled induction motor drives have been widely used over the last several years. Conventional direct stator-flux-oriented control schemes have the disadvantage of poor performance in the low-speed operating area when the stator flux is calculated using the voltage model, due to the stator resistance uncertainties and variations. In this paper, a new closed-loop stator-flux estimation method for a stator-flux-oriented vector-controlled induction motor drive is presented in which the stator resistance value is updated during operation. This method is based on a simple algorithm capable of running in a low-cost microcontroller, which is derived from the dynamic model of the induction machine. The effects of stator resistance detuning, especially in the low-speed operating region, are investigated and simulation results are shown. The motor drive system as well as the control logic and the resistance estimator are simulated and characteristic simulation results are derived. In addition, the proposed control scheme is experimentally implemented and some characteristic experimental results are shown. The simulation as well as the experimental results reveal that the proposed method is able to obtain precise flux and torque control, even for very low operating frequencies

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:48 ,  Issue: 6 )

Date of Publication:

Dec 2001

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