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:
Oct. 24, 2017
Filed:
Aug. 04, 2011
Hiroi Yamaguchi, Tokyo, JP;
Seiji Okabe, Tokyo, JP;
Takeshi Omura, Tokyo, JP;
Tadashi Nakanishi, Tokyo, JP;
Hiroi Yamaguchi, Tokyo, JP;
Seiji Okabe, Tokyo, JP;
Takeshi Omura, Tokyo, JP;
Tadashi Nakanishi, Tokyo, JP;
JFE Steel Corporation, , JP;
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 Bto 1.92 T or higher; then setting a ratio of average magnetic domain width of treated surface after strain-introducing treatment Wto average magnetic domain width before strain-introducing treatment Was W/W<0.4; and setting a ratio of Wto average magnetic domain width of untreated surface Was W/W>0.7; and further setting a ratio of average width of magnetic domain discontinuous portion Win the untreated surface to average width of magnetic domain discontinuous portion in treated surface resulting from strain-introducing treatment Was W/W>0.8; and setting W<0.35 mm.