Equivalent Resistance Model of the Permanent-Magnet Motor for Predicting Electromagnetic Losses

This paper proposes an equivalent resistance model of the permanent-magnet (PM) motor which is useful for predicting the losses. The PM loss and iron loss are replaced by the eddy-current loss and hysteresis loss in the equivalent resistance model, where the characteristics of these losses are extracted from the analytical model. The harmonic current and the current control angle are investigated in the paper to guarantee the accuracy of the loss prediction. The parameters in the equivalent resistance model can be easily obtained from the finite-element model and experiment. The proposed model demonstrates significant potential to improve motor efficiency.