Title:
LAMINATED CORE AND METHOD FOR MANUFACTURING LAMINATED CORE
Document Type and Number:
WIPO Patent Application WO/2024/053732
Kind Code:
A1
Abstract:
A laminated core 10 is formed by alternately laminating electromagnetic steel sheets 1 and adhesive insulating films 2. After completion of reaction of the adhesive insulating films 2, the tensile adhesive strength in a laminating direction D of the laminated core 10 is 20 MPa or higher when measured under a condition at 25°C. A method for manufacturing the laminated core 10 comprises: a punching step for punching electromagnetic steel sheets coated with the adhesive insulating films 2 and forming the electromagnetic steel sheets 1; a storage step for laminating and storing the electromagnetic steel sheets 1 in a mold after the punching step; a low-pressure adhesion step for heating the electromagnetic steel sheets 1 in the mold at a surface temperature of 60-200°C, applying pressure on the electromagnetic steel sheets at 3.0 MPa or lower, and bonding the adjacent electromagnetic steel sheets 1 to each other, to thereby form the laminated core 10; and a taking-out step for taking out the laminated core 10 from the mold after the low-pressure adhesion step.
Inventors:
ARAMAKI TAKASHI (JP)
Application Number:
PCT/JP2023/032859
Publication Date:
March 14, 2024
Filing Date:
September 08, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
H01F3/02; H01F27/245; H01F41/02; H02K15/02
Domestic Patent References:
| WO2021256533A1 | 2021-12-23 | |||
| WO2016017132A1 | 2016-02-04 |
Foreign References:
| JP2022513168A | 2022-02-07 | |||
| JP2017216873A | 2017-12-07 | |||
| JP2020113647A | 2020-07-27 | |||
| JP2002260910A | 2002-09-13 | |||
| JP2022018470A | 2022-01-27 | |||
| JP2014096429A | 2014-05-22 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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