Abstract
This paper presents a method for determining the rotor temperature of an electric motor by observing the dq-axis flux linkage. A reference dq-axis flux linkage is obtained at a defined rotor temperature. The difference between calculated and reference flux in the d-axis is supposed to be caused by temperature, therefore the temperature can be back-calculated according to the permanent magnet temperature characteristic. The proposed method was confirmed to be correct and effective by the test results.
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