METHOD FOR MANUFACTURING LAMINATED IRON CORE

WIPO Patent Application WO/2023/112420

A1

Provided is a method for manufacturing a laminated iron core by which an excellent iron loss characteristic can be obtained.　The method for manufacturing a laminated iron core according to the present invention is characterized in that an electromagnetic steel plate having an insulation coating on the surface and having a roughness coefficient of the insulation coating surface of 2.0 or higher is machined to a prescribed shape using a pulsed laser having a beam diameter of 200 µm or less and a pulse width of a nanosecond level or greater, or a continuous laser having a beam diameter of 200 µm or less, and the machined electromagnetic steel plate is laminated. The method for manufacturing a laminated iron core according to the present invention is also characterized in that an electromagnetic steel plate having an insulation coating on the surface is machined to a prescribed shape using a picosecond pulsed laser or a femtosecond pulsed laser, or is machined to a prescribed shape in water or in a state of having a water film on the surface, using a pulsed laser having a pulse width of a nanosecond level or greater, or a continuous laser, and the machined electromagnetic steel plate is laminated.

JP4099204	Magnet manufacturing method
JPS6421904	CASE FOR BAKING FERRITE
JPH10270223	R-FE-C RARE-EARTH MAGNET, R-FE-C RARE-EARTH BOND MAGNET, AND MANUFACTURE THEREFOR

OMURA TAKESHI (JP)
ICHIHARA YOSHIHISA (JP)
YOSHIZAKI SOUICHIRO (JP)

PCT/JP2022/035417

June 22, 2023

September 22, 2022

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JFE STEEL CORP (JP)

H01F41/02; C21D8/12; C22C38/00; C22C38/60

WO2019156220A1

2019-08-15

JP2018090871A	2018-06-14
JP2012052229A	2012-03-15
JP2016048991A	2016-04-07
JPH11786A	1999-01-06

KUMASAKA Akira et al. (JP)

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