Title:
ORIENTED ELECTROMAGNETIC STEEL SHEET FOR LOW-NOISE TRANSFORMER, AND METHOD FOR MANUFACTURING SAID SHEET
Document Type and Number:
WIPO Patent Application WO/2015/129253
Kind Code:
A1
Abstract:
An oriented electromagnetic steel sheet processed using magnetic domain segmentation by the steel sheet surface being irradiated with an electron beam in a linear area having a direction intersecting with the rolling direction, wherein: the irradiation line area is made into repeating units made up of two types of areas comprising a retention area and a travel area; modulated-irradiation line areas are obtained by connecting the repeating units in the line-area direction; the period of the repeating units in the modulated-irradiation line area is 0.20-1.0 mm; the repeating interval of the modulated-irradiation line area in the rolling direction is 4.0-12.5 mm; and the intensity of the electron beam is brought to a level equal to or greater than that at which split magnetic domains are formed extending in the direction of the modulated-irradiation line area at least on the irradiation-surface side, and up to a level at which the coating is not damaged and no plastic strain areas are formed on the irradiation-surface side. It is thereby possible to carry out a hitherto challenging magnetic-domain segmentation process in a transformer in which iron loss and noise are both low, and obtain an oriented electromagnetic steel sheet that has unprecedentedly low iron loss and magnetic distortion.
Inventors:
TODA HIROAKI (JP)
TAKAJO SHIGEHIRO (JP)
SUEHIRO RYUICHI (JP)
KOMATSUBARA MICHIRO (JP)
TAKAJO SHIGEHIRO (JP)
SUEHIRO RYUICHI (JP)
KOMATSUBARA MICHIRO (JP)
Application Number:
PCT/JP2015/000931
Publication Date:
September 03, 2015
Filing Date:
February 24, 2015
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; B23K15/00; H01F1/16; H01F41/02
Domestic Patent References:
| WO2013100200A1 | 2013-07-04 | |||
| WO2013046716A1 | 2013-04-04 |
Foreign References:
| JP2013072116A | 2013-04-22 | |||
| JP2012036445A | 2012-02-23 | |||
| JP2012036450A | 2012-02-23 | |||
| JP2012172191A | 2012-09-10 |
Attorney, Agent or Firm:
SUGIMURA, KENJI (JP)
Kenji Sugimura (JP)
Kenji Sugimura (JP)
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