This paper proposes a closed-form 3D analytical model developed for the estimation of eddy current losses in an interior permanent magnet synchronous machine. Two different types of commonly employed interior permanent magnet machines are considered for the loss analysis. The results of the analytical model are compared with the results from 3D finite element analysis. The proposed model can be directly used to evaluate the eddy current magnet losses for various magnet segmentations in the axial and tangential directions. The influence of air-gap length, PWM carrier frequency, reaction field of induced eddy current and non-linearity of iron on the eddy current magnet losses have been studied in detail and the results are presented. The results from analytical and 3D finiteelement analyses were found to be in good concurrence with a maximum difference of 5.9 %.
In this paper a closed-form 2D analytical model developed for the estimation of eddy current loss in interior permanent magnet machines is presented. To check the generality of the developed model, two different types of commonly employed interior permanent magnet machines are considered. 2D finite-element analysis was used to benchmark the results from the analytical model. The proposed model can be directly used to evaluate the eddy current magnet loss for magnet segmentation in the circumferential direction. The influence of air-gap length, frequency of carrier harmonic, reaction field and non-linearity of iron due to saturation on the magnet loss have been studied in detail and the results are presented. The effect of axial segmentation has been considered by incorporating an end-effect factor in the analytical model. The results from analytical and 2D finite-element analyses are found to be in concurrence.Index Terms--permanent magnets, eddy current loss, magnet segmentation, analytical model, finite element method, interior permanent magnet synchronous motor
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