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| Core Loss Compensation of Sensorless Direct-Field Oriented Induction Motor Drives Based on Adaptive Full-Order Observer |
Ahmed G. Mahmoud A. Aziz, Yehia Sayed Mohammed, Hamdi Ali, Ahmed A. Zaki Diab
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Abstract:
Induction motor (IM) drives, specifically the three-phase IMs, are a nonlinear system that is difficult to explain theoretically due to their sudden changes in speed or load conditions. Thus, advanced controllers are required to boost the IM performance. In many IM applications, vector-control is the most widely used technique owing to its high rendering for controlling IMs. However, there are some issues with this technique when applied in IM drives. This paper introduces a sensorless direct field-oriented control (DFOC) IM drive via adaptive full-order observer (AFOO) taking core-loss in to account. The AFOO is designed to simultaneous estimate of stator and rotor resistance, and rotor speed. Given that there is a noticeable influence of IM core-loss on the sensorless system of IM drives, an approach has been proposed that compensates for the effect of these losses in such a way that it does not affect the estimation of both rotor velocity and motor parameter. Via MATLAB?(r)? and Simulink(r) from Math Works(r) ?(2018a, Natick, MA, 01760-2098 USA) simulation results, the proposed sensorless system can operate at low-speed. Furthermore, a comparison among the conventional FOO (without core-loss compensation) and the suggested one (with core-loss compensation) has been carried out.
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