Effects of punch process on the magnetic and energetic properties of soft magnetic material

The paper presents a method to determine the effects due to the punching process on soft magnetic materials used in the electrical machines. The proposed methodology, is based on a full experimental approach. Four wound cores, having the same geometrical dimensions, have been assembled as the overlap of a different number of rings. The rings have been obtained by means of a punching process and in this way the four wound cores present an evident difference in terms of punched edge length. The comparison between the magnetic and energetic properties on the four cores has put in evidence in a qualitative and quantitative way, the punching process effects.