Epstein frame measurement based determination of original non-degraded and fully degraded magnetic characteristics of material submitted to laser cutting

The degrading effect of laser cutting on steel sheet material, and thus on the material's magnetic characteristics, is much less understood than that of mechanical cutting. Furthermore, the estimated degrading influence on magnetic properties is still difficult to determine and not sufficiently known. In this paper, the magnetic characteristics of the degraded and non-degraded zones are computed from data obtained by two Epstein frame measurements using sample strips of different widths. Subsequently, these new characteristics are inserted into a finite-element model, which accounts for arbitrary geometries. The simulation results for the influence of laser cutting on the magnetic characteristics of the stator lamination stacks are verified by measurements.