EVALUATION OF INTRALAMINAR LOSSES IN MAGNETIC CORES

Laminations of electrical machines are coated to be insulated from eac h other. However, defects can appear in the insulating layer and losse s produced by eddy currents flowing from one sheet to another have to be evaluated. Measurements performed with a standard Franklin device s how that the surface insulation resistance of the sheets have a wide r ange of values. In this paper two models of intralaminar losses calcul ation are presented but they do not take this scattering into account. The model that we develop is more appropriate to the stochastic aspec t of the measurements.