As a basic theoretical research for the ultra efficiency motor design, in this paper, the influence of wye and delta connection on induction motor losses is focused on. The Multi-slice field-circuit coupled time-stepping finite element method (T-S FEM), taking slot opening and skew effect into account, is used to predict the losses with wye and delta connection under different load conditions respectively. It is shown that the copper loss is higher when delta connection is adopted and the iron losses of wye connection may be more than that of the delta connection.
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