In this paper, we describe the construction of an equivalent circuit that considers harmonics and stray load loss in induction motors. First, harmonic losses in the motors are investigated by electromagnetic field analysis. Using the obtained results, several equivalent circuits that consider harmonics and stray load loss are proposed and the circuit parameters are determined. Next, the best circuit is determined from the viewpoint of practical use. Finally, the motor characteristics calculated by using the proposed circuit are compared with those of experiments. It is concluded that the accuracy of the proposed equivalent circuit is considerably higher than that of the conventional circuit, particularly at high rotational speeds.
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