Title:
METHOD FOR MANUFACTURING MOTOR CORE
Document Type and Number:
WIPO Patent Application WO/2020/241315
Kind Code:
A1
Abstract:
The method for manufacturing a motor core according to the present invention includes a step of manufacturing a motor core by processing an electromagnetic steel sheet, in which an average thermal conductivity from the surface to a position at a depth of 1/3 of the sheet thickness from the surface is 30% or more lower than the thermal conductivity at the center position in the plate thickness direction, by fusing by heat input from the surface. The thickness of the electromagnetic steel sheet is desirably 0.20 mm or less. It is also desirable that the concentrations of Si, Al, and Mn from the surface of the electromagnetic steel sheet to the position at a depth of 1/3 of the sheet thickness satisfy predetermined conditions. Further, it is desirable that the component concentration over the entire thickness of the electromagnetic steel sheet be, in % by mass, C: 0.01% or less, Si: 7% or less, Al: 4% or less, Mn: 5% or less.
Inventors:
YOSHIZAKI SOUICHIRO (JP)
SENDA KUNIHIRO (JP)
ZAIZEN YOSHIAKI (JP)
MIYAMOTO YUKINO (JP)
SENDA KUNIHIRO (JP)
ZAIZEN YOSHIAKI (JP)
MIYAMOTO YUKINO (JP)
Application Number:
PCT/JP2020/019494
Publication Date:
December 03, 2020
Filing Date:
May 15, 2020
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D8/12; C22C38/00; C22C38/06; H01F1/147; H01F41/02; H02K1/02; H02K15/02
Foreign References:
| JP2009263782A | 2009-11-12 | |||
| JP2010063252A | 2010-03-18 | |||
| JPS5570492A | 1980-05-27 | |||
| JP2000197318A | 2000-07-14 | |||
| JPS63303693A | 1988-12-12 |
Other References:
"Effect of laser cutting on microstructure and on magnetic properties of grain non-oriented electrical steels", JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, vol. 256, 2003, pages 20 - 31
See also references of EP 3978636A4
See also references of EP 3978636A4
Attorney, Agent or Firm:
SAKAI INTERNATIONAL PATENT OFFICE (JP)
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