ABSTRACT
The rotor resistance of induction motors is used to calculate the slip frequency, and this slip is used to calculate the angle between the stator and the rotor. This angle is the most important parameter in the vector control schemes. Thus, the change in temperature and saturation levels cause the variation of the rotor resistance value and hence the deterioration of the whole torque control characteristic. This research presents a simulation of induction motor behavior facing a sudden rotor resistance variation at very low speed basing on sliding mode perturbation rejection controllers, the rotor flux and speed are observed by an extended Kalman filter. Simulation results show that the proposed control provide good performance dynamic characteristics for a large scale rotor resistance variation. All simulations have been realized in MATLAB/Simulink.
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