A new stator resistance tuning method for stator-flux-orientedvector-controlled induction motor drive
Mitronikas, E.D.; Safacas, A.N.; Tatakis, E.C.
Industrial Electronics, IEEE Transactions on
Volume 48, Issue 6, Dec 2001 Page(s):1148 - 1157
Digital Object Identifier 10.1109/41.969393
Summary: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
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