Abstract

All types of electrical machines can be modeled by an equivalent two phase machine. For example a balanced three phase induction motor can be modeled as an equivalent two phase induction motor (The dq Model). In the same way an unbalanced induction motor can be modeled as an unbalanced two phase induction motor. This paper shows this concept by modeling a faulty induction motor with one of its three feeding phases, open. Moreover the paper shows that the speed control of this faulty motor can be performed by a few modifications in the conventional vector control. This new vector control is suitable for unbalanced induction motors such as the single phase induction motor with unequal main and auxiliary windings. Computer simulation shows the good performance of the proposed method.

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