Analytical method for determining the damaged area width in magnetic materials due to punching process

The authors deal with the problem of estimating the zone width of damaged magnetic materials, which is the result of industrial processes adopted for the lamination sheet production. The authors propose two approaches: the former uses the 3D FEM model, while the latter proposes an analytical formula. Both approaches use the results of measurements performed on toroidal samples. The final result of the study is the comparison between the width of the damaged zone computed with the two proposed approaches and the comparison between the calculated and measured power losses.