Abstract
AbstractTransposition of stator bar is an important technique to reduce the circulating current loss in stator bar. The 3-D numerical calculation method is widely used in the generator design. However, the mesh of the stator transposition bar model is difficult to realize, especially in the case of short transposition pitch. The computable model of the actual transposition structure of stator bar for circulating current loss calculation is beneficial to the winding design. In this study, we present the 3-D multi-segment modelling method for stator transposition bar. In this method, the global model of slot model with stator bar is divided into multiple segment models, the segment strands are coupled by coupling circuit. The less than 360° stator transposition bar in large hydro-generator is taken as example, the circulating current loss is calculated. The calculation accuracy is verified by experiments. Finally, by comparing with the leakage magnetic flux distributions obtained by the proposed multi-segment method and the traditional 2.5-D multi-slice method, the results are discussed.KeywordsCirculating current loss3-D modeling methodNumerical calculationStator transposition barLarge hydro-generators
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