Abstract
In this study, we evaluate the losses of a 1-MW-class induction motor at the inverter feeding. We propose a loss calculation method using the resistivity of the bars based on an expression of the motor characteristic and measured results. Then, we separate the losses into no-load iron loss, stray load loss, and time-harmonic loss by the inverter feeding. The results show that the measured and corresponding calculated losses agree well. Then, it is clarified that the secondary harmonic loss is especially large. In addition, we reveal that the time-harmonic losses are caused by the magnetic flux of the carrier harmonics, which passes through the surfaces of the secondary bars by a calculation considering the carrier-harmonic currents.
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