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Prediction of eddy current losses of surface mounted permanent magnet servo motor

Eddy current losses are generated in a magnetic material when it is excited by an AC magnetic field. These losses increase the temperature of the magnets, which causes demagnetization, then deterioration of these magnets. This paper deals with calculation of eddy current losses of a servo motor with permanent magnets. Eddy current losses are calculated using two methods for both two and three dimensional models of the PM servo motor. These losses have been calculated according to the permanent magnets properties and to the magnetic flux density distribution in the air gap between the stator and the rotor of the analyzed servo motor. Finally, a comparison of the different results is performed.