Grain oriented electrical steel sheet
US9799432B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2011 |
| Grant date | Oct 24, 2017 |
| Priority date | — |
| Expiry date | Aug 1, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A grain oriented electrical steel sheet has a magnetic domain structure modified by strain introduction without a trace of treatment, in which noise generated when the grain oriented electrical steel sheet is used laminated on an iron core of a transformer is effectively reduced by: setting a magnetic flux density B8 to 1.92 T or higher; then setting a ratio of average magnetic domain width of treated surface after strain-introducing treatment Wa to average magnetic domain width before strain-introducing treatment W0 as Wa/W0<0.4; and setting a ratio of Wa to average magnetic domain width of untreated surface Wb as Wa/Wb>0.7; and further setting a ratio of average width of magnetic domain discontinuous portion Wd in the untreated surface to average width of magnetic domain discontinuous portion in treated surface resulting from strain-introducing treatment Wc as Wd/Wc>0.8; and setting Wc<0.35 mm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.