The authors present a method of improving the characteristics of flux-observer-based field-oriented induction motor drives by considering core losses. Two kinds of adaptive flux observers of induction motors have been proposed. One adaptive scheme identifies stator and rotor resistances which vary with the motor temperature. The other one identifies the motor speed for eliminating rotational transducers. These adaptive flux observers were derived from an induction motor model which neglects core losses. In the present work, the influence of the core losses on the adaptive flux observers and field-oriented induction motor drives is investigated, and a compensation method is proposed. In order to compensate for this influence, a novel flux observer taking the core loss into account approximately is proposed. The validity of the proposed method has been verified by simulation.
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