Low core loss grain-oriented electrical steel sheet and method for producing the same
US8016951B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2006 |
| Grant date | Sep 13, 2011 |
| Priority date | — |
| Expiry date | Nov 22, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/14775
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An object of the present invention is to provide a grain-oriented electrical steel sheet with low core loss and low magnetostriction and a method for producing the same. The grain-oriented electrical steel sheet is excellent in reduced core loss and magnetostriction while under a high flux density of 1.9 T, comprises a refined magnetic domain comprising a laser irradiated portion which has melted and resolidified to form a solidified layer, wherein the thickness of the solidified layer is 4 μm or less. The grain-oriented electrical steel sheet may further comprise a laser irradiated portion where a surface roughness Rz is small and a cross section viewed from a transverse direction has a concave portion having a width of 200 μm or less and a depth of 10 μm or less for further improvement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.