Title:
MAGNETIC CORE UNIT AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2019/065249
Kind Code:
A1
Abstract:
[Problem] To provide a magnetic core unit in which a coil is directly wound around a magnetic core comprising a nanocrystal alloy ribbon, in which magnetic core unit an increase in core loss is suppressed, and a method for manufacturing the same.
[Solution] A method for manufacturing a magnetic core unit in which a magnetic core comprising a nanocrystal alloy ribbon is used comprises: a heating process step of heating a magnetic core material comprising an amorphous alloy ribbon that can be nano-crystallized to a temperature higher than or equal to a crystallization start temperature ; and a coil step of disposing a coil on a magnetic core comprising a nanocrystal alloy ribbon obtained after the heating process. The magnetic core unit manufacturing method is characterized in that the coil step includes winding the coil directly on the magnetic core material, and that in the heating process step, in a diagram showing the time (minutes) of the heating process on the horizontal axis and the temperature (°C) of the magnetic core material on the vertical axis, the area (temperature-time integral value σ) of a region surrounded by a line parallel with the horizontal axis at the crystallization start temperature and a temperature of the magnetic core material is set to be in a range of not less than 14000 and not more than 30000.
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Inventors:
NAKADA TSUGITOMO (JP)
Application Number:
PCT/JP2018/033848
Publication Date:
April 04, 2019
Filing Date:
September 12, 2018
Export Citation:
Assignee:
HITACHI METALS LTD (JP)
International Classes:
H01F41/02; C21D6/00; C22C45/02; H01F1/153; H01F27/25; H01F41/04
Foreign References:
| JP2016197720A | 2016-11-24 |
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