Improvement of magnetic properties in thinner HI-B with domain-refinement

The domain-refinement technique which was developed to decrease anomalous eddy-current loss showed remarkable effect. The LASER-scribing method enabled the development of industrial products. Moreover, when this domain-refinement was applied to thinner gaged core material, the effect appeared in a marked degree. In this paper, the improvement of magnetic Properties of 0.23mm thick domain-refined core material is emphasized, because it has been used widely. It was clarifyed that the effect of domain-refinement depended on the thickness of core materials and the induction at 1000A/m strongly. The core losses, 0.80W/kg at 1.7T, 50Hz and 0.59W/kg at 1.5T, 50Hz were successfully obtained for an industrial product, 0.23mm HI-B. When the LASER-scribing was applied to very high permeability HI-B, the hysteresis loss was little changed, but the eddy-current loss decreased sharply. Further, by the numerical analysis with actually measured data, the Building Factor was also improved by the patterns of the LASER-scribing.