WOUND CORE AND METHOD FOR MANUFACTURING SAME - NIPPON STEEL & SUMITOMO METAL CORP

Title:

WOUND CORE AND METHOD FOR MANUFACTURING SAME

Document Type and Number:

WIPO Patent Application WO/2018/131613

Kind Code:

A1

Abstract:

This wound core is configured by stacking a plurality of bending-processed bodies upon each other in a sheet thickness direction thereof, the bending-processed bodies being formed from a directional magnetic steel sheet having phosphorus-containing coating formed on a surface thereof. The bending-processed bodies are formed in a rectangular shape, each having four planar portions and four corner portions adjacent to the planar portions. The corner portions include a flexed area in which, as viewed laterally, a sum of bending angles is substantially 90°. As viewed laterally, the number of deformation twins present in the flexed area is not more than five per mm of a length of a central line in the sheet thickness direction in the flexed area. The amount of phosphorus eluted from the corner portions when boiled in water for 30 minutes is not more than 6.0 mg per m2 of a surface area of the corner portions.

Inventors:

MIZUMURA TAKAHITO (JP)
MIZOKAMI MASATO (JP)
YABUMOTO MASAO (JP)
UEMURA TOSHIHIKO (JP)
MINEMATSU EISUKE (JP)
TAKAHASHI FUMIAKI (JP)

Application Number:

PCT/JP2018/000364

Publication Date:

July 19, 2018

Filing Date:

January 10, 2018

Export Citation:

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Assignee:

NIPPON STEEL & SUMITOMO METAL CORP (JP)

International Classes:

H01F1/147; H01F27/25; H01F41/02

Domestic Patent References:

WO2013058239A1

2013-04-25

Foreign References:

JP2011243792A	2011-12-01
JPS62270723A	1987-11-25
JP2012161114A	2012-08-23
JP2009052060A	2009-03-12
JPH1032132A	1998-02-03
JP2017001829A	2017-01-05

Other References: