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This paper proposes a calculation method for iron loss resistance that is suitable for modeling permanent magnet synchronous motors. The proposed method is based on the linear feature between semi-input power and square of speed electromotive force. The iron loss resistance is calculated from the slope of this linear function in the offline manner. The advantage of the proposed method is that the iron loss resistance can be calculated directly without any measurements related to mechanical loss. The proposed method can be executed at any load conditions. The validity of the proposed method is experimentally confirmed by the comparison between the actual torque and the calculated torque containing the iron loss resistance.

A Novel Calculation Method for Iron Loss Resistance Suitable in Modeling Permanent Magnet Synchronous Motors