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Title:
IRON CORE FOR TRANSFORMER
Document Type and Number:
WIPO Patent Application WO/2019/189859
Kind Code:
A1
Abstract:
The present invention reduces vibration of an iron core and ameliorates the noise of a transformer. An iron core for a transformer, said iron core having a plurality of oriented electromagnetic steel sheets laminated therein, wherein in at least one of the oriented electromagnetic steel sheets, (1) the oriented electromagnetic steel sheet has a region in which a closure domain is formed in a direction intersecting a rolling direction, and a region in which a closure domain is not formed, and when S is the area of the oriented electromagnetic steel sheet, S1 is the area of the region in which a closure domain is formed, S0 is the area of the region in which a closure domain is not formed, and S1a is the area of a region that is within the region in which a closure domain is formed and experiences, when excited in the rolling direction at a maximum magnetic flux density of 1.7T and a frequency of 50Hz, at least 2×10-7 more elongation at a maximum displacement point than the elongation of the region in which the closure domain is not formed, (2) the area ratio R0, which is defined as the ratio of S0 to S, is 0.10-3.0%, and (3) the area ratio R1a, which is defined as the ratio of S1a to S1, is 50% or more.

Inventors:
OMURA Takeshi (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
INOUE Hirotaka (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
OKABE Seiji (JFE STEEL CORPORATION 2-3, Uchisaiwai-cho 2-chome, Chiyoda-k, Tokyo 11, 〒1000011, JP)
Application Number:
JP2019/014274
Publication Date:
October 03, 2019
Filing Date:
March 29, 2019
Export Citation:
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Assignee:
JFE STEEL CORPORATION (2-3 Uchisaiwai-cho 2-chome, Chiyoda-ku Tokyo, 11, 〒1000011, JP)
International Classes:
H01F27/245; H01F1/16; C21D8/12; H01F41/02
Domestic Patent References:
WO2012164702A12012-12-06
Attorney, Agent or Firm:
SUGIMURA Kenji (36F Kasumigaseki Common Gate West, 3-2-1 Kasumigaseki, Chiyoda-k, Tokyo 13, 〒1000013, JP)
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