The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2024
Filed:
Mar. 29, 2019
Applicant:
Jfe Steel Corporation, Tokyo, JP;
Inventors:
Assignee:
JFE STEEL CORPORATION, Chiyoda-ku, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01F 1/16 (2006.01); C21D 6/00 (2006.01); C21D 8/12 (2006.01); H01F 27/245 (2006.01);
U.S. Cl.
CPC ...
H01F 1/16 (2013.01); C21D 6/008 (2013.01); C21D 8/12 (2013.01); H01F 27/245 (2013.01); C21D 2201/05 (2013.01); Y10T 428/32 (2015.01);
Abstract
Vibration of an iron core is reduced to reduce transformer noise. An iron core for a transformer comprises a plurality of grain-oriented electrical steel sheets stacked together, wherein at least one of the plurality of grain-oriented electrical steel sheets: (1) has a region in which closure domains are formed in a direction crossing a rolling direction and a region in which no closure domains are formed; (2) has an area ratio Rof 0.10% to 3.0%, the area ratio Rbeing defined as a ratio of Sto S; and (3) has an area ratio Rof 50% or more, the area ratio Rbeing defined as a ratio of Sto S.