Abstract
The prediction of core losses in a rotating electrical machine generally requires a numerical approach (finite element or integral method). However, the magnetic characteristics obtained through a standard Epstein facility and inserted in the numerical models predict losses which are quite different from those obtained experimentally. This difference can be partly explained by the presence of plastic strain close to the cutting edge of manufactured motor sheets. In the present paper, numerical functions are first established to predict the change in the magnetisation and loss curves with respect to the plastic strain level. Second, a microhardness test is used to measure the local plastic strain directly on the manufactured sheet. Finally, relations are obtained between the main magnetic properties and the position on the sheet: the resulting magnetic property profiles allow the numerical approach to be improved.
MST/2039
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