The influence of cutting edge deformations on magnetic performance degradation of electrical steel

Even though it has been widely known the cutting process of the electrical steel brings deterioration effects on magnetic properties, it is still unclear how to evaluate the quality of the cutting process effectively. This research investigates the performance degradation of the punching process based on a newly developed instrument. Three needle probes are arranged in a special way to pick up the flux around the area of the cutting edge and the flux of the unaffected center area, respectively. The amount of performance degradation can be evaluated by comparing the edge and the center flux values. 50CS1300 samples with different punching clearances were produces and measurement results were obtained. The power conversion loss imposed by the punching process were evaluated in terms of several measured parameters, including magnetic flux density, iron loss, and copper loss.