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Title:
INDUCTOR FOR ELECTROMAGNETIC PIPE EXPANDING, AND METHOD OF MANUFACTURING THE SAME
Document Type and Number:
Japanese Patent JP2011187504
Kind Code:
A
Abstract:

To provide an inductor for electromagnetic pipe for prolonging the service life prolonged by improving the durability by means of reduction in the electromagnetic reaction force acting on a coil conductor and reduction of shear stress acting on an interface between the conductor covered with a resin impregnated fiber layer and a shaft, and a method of manufacturing the inductor.

The inductor 1 for electromagnetic pipe expanding is positioned so that coils are located apart, respectively in first and second sections 11 and 12 at both ends in a longitudinal direction of a bobbin 2, so that the coils are in contact in a third section. The distance between the centers of conductors d+d2 in the third section is a square ratio of (d+d2)2/(d+d1)2 for the distance between centers of conductors d+d1 in the first and second sections and ranges from 0.30 to 0.82.


Inventors:
MORI MITSUTOSHI
HOSOI HIROAKI
KANEHASHI HIDEKATSU
IMAMURA YOSHIHAYA
Application Number:
JP2010048301A
Publication Date:
September 22, 2011
Filing Date:
March 04, 2010
Export Citation:
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Assignee:
KOBE STEEL LTD
International Classes:
H01F5/00; B21D26/14; B21D39/08; H01F5/06; H01F41/04
Domestic Patent References:
JP2009101389A2009-05-14
JP2004351457A2004-12-16
JPS4614514B1
JP2011031290A2011-02-17
JP2011121083A2011-06-23
JP2009054808A2009-03-12
JPS5837051B21983-08-13
JPS5548916A1980-04-08
JPS58151004A1983-09-08
JP2009101389A2009-05-14
JP2004351457A2004-12-16
JPS4614514B1
JP2011031290A2011-02-17
JP2011121083A2011-06-23
Attorney, Agent or Firm:
Masanori Fujimaki