Abstract
The complexity of winding distribution of doubly salient electro-magnetic machine (DSEM) results in its uneven temperature distribution, and its temperature rise characteristics under different working conditions need to be further studied. Different from the thermal analysis method of uniformly distributed electrical machine, this article proposes a time-saving thermal analysis method for the new topology of DSEM. In view of the sensitive change of DSEM excitation loss with temperature, the magnetic-thermal bidirectional coupling method is adopted. Considering the temperature difference between excitation and armature coils, a detailed thermal model is established for the armature-excitation slot. The number of bidirectional coupling iterations of finite-element method is reduced by steady-state temperature prediction. Then the temperature distribution of DSEM is analyzed in detail, and the variation of the temperature distribution under different operating conditions is studied. The temperature rise characteristics of a three-phase 12/8-pole prototype are tested to verify the correctness of the proposed method. The research results can provide reference for the temperature evaluation of DSEM and its electromagnetic and cooling design.
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