Title:
METHOD FOR MANUFACTURING LAMINATED IRON CORE AND LAMINATED IRON CORE
Document Type and Number:
WIPO Patent Application WO/2024/004437
Kind Code:
A1
Abstract:
This method for manufacturing a laminated iron core comprises: a punching step for punching a steel sheet so as to form a back-yoke-forming portion that extends in one direction, and a plurality of teeth that extend from the back-yoke-forming portion in a direction that intersects the one direction as seen in the thickness direction of the steel sheet; and a bending step for bending the back-yoke-forming portion that was formed in the punching step in an arc as seen in the thickness direction, so as to form a back yoke portion. In the punching step, a pair of protrusions are formed at tip portions of the plurality of teeth, said pair of protrusions respectively protruding toward one side and the other side in the width direction of the teeth, and, as seen in the thickness direction of the steel sheet, and a recess is formed in a portion of the plurality of teeth, in which portion the size of a gap between teeth that are positioned adjacent to each other is smaller than the size of the pair of protrusions in the width direction, said recess having a depressed region that is recessed in the width direction and is bigger than said protrusions.
Inventors:
NAGANO YOSHITO (JP)
KUMAGAI SHUNSUKE (JP)
KUMAGAI SHUNSUKE (JP)
Application Number:
PCT/JP2023/018988
Publication Date:
January 04, 2024
Filing Date:
May 22, 2023
Export Citation:
Assignee:
NIDEC CORP (JP)
International Classes:
H02K15/02
Foreign References:
| JP2001359246A | 2001-12-26 | |||
| JP2017175715A | 2017-09-28 | |||
| US20060091758A1 | 2006-05-04 | |||
| JP2010063240A | 2010-03-18 |
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