A first approach for the iron losses building factor determination

In the paper a possibility to determine the iron losses building factor is proposed. The used methodology, which has to be intended as a first approach to the problem, is based on a full experimental approach. Four wound cores, having the same geometrical dimensions, have been assembled as the addition of different number of rings of the same magnetic material. The rings have been obtained by means of a punching process and as a consequence, the four wound cores present a well evident difference in terms of punched edges perimeters. The comparison between the specific losses [W/kg] has been used to obtain the iron loss increase due to the punching process. A building factor defined as the iron loss increase for punched edges length and for sheet can be obtained. The obtained building factor has been used to predict the iron losses in the stator core of an induction motor realized with the same magnetic material used for the wound cores. The comparison between the measured and the predicted results is quite good and it can be considered an interesting starting point for future research.