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.
HOSOI HIROAKI
KANEHASHI HIDEKATSU
IMAMURA YOSHIHAYA
JP2009101389A | 2009-05-14 | |||
JP2004351457A | 2004-12-16 | |||
JPS4614514B1 | ||||
JP2011031290A | 2011-02-17 | |||
JP2011121083A | 2011-06-23 | |||
JP2009054808A | 2009-03-12 | |||
JPS5837051B2 | 1983-08-13 | |||
JPS5548916A | 1980-04-08 | |||
JPS58151004A | 1983-09-08 | |||
JP2009101389A | 2009-05-14 | |||
JP2004351457A | 2004-12-16 | |||
JPS4614514B1 | ||||
JP2011031290A | 2011-02-17 | |||
JP2011121083A | 2011-06-23 |