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This study presents a method to observe the rotor flux of a current-controlled induction motor. To ensure maximum robustness, a feedback loop is used to eliminate the error between actual system and model outputs. A reduced-order observation model is used to decrease the computation time. Various perturbation tests, particularly for large parameters variations, have been carried out by simulation, yielding an excellent state observer performance. Some experimental results allow a check on the state observation model.
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Roboam et al. (1992) studied this question.
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