Laminated core and method of producing laminated core
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 1, 2011
Grant Date -
Mar 25, 2004
app pub date -
May 23, 2002
filing date -
May 25, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Thin sheets of magnetic material are subjected to a pressing process to stamp many sheets of core pieces, and caulking projections defined in the core pieces are caused to go into connecting through holes defined in the core pieces for connecting and laminating to produce a laminated core. In lower layer of the core pieces having the caulking projections arranged in different positions seeing in plan, at least two sheets of core pieces and other core pieces having the connecting through holes are provided. The caulking projections defined in the core pieces have projecting length of at least twice of thickness of the core pieces, and are fitted in the connecting through holes, so that upper and lower laminated core pieces are unified.
First Claim
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International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- H01F Class
- 8.17 % this patent is cited more than
- 14 Age
