Electromagnetic method and apparatus for positioning objects...

Details Electromagnetic method and apparatus for positioning objects... Electromagnetic method and apparatus for positioning objects...

G - Physics

21

C

342/12, 359/27,

G21C 19/20 (2006.01) G21C 3/334 (2006.01) G21C 19/10 (2006.01)

Patent

CA 1227292

- 18 - ABSTRACT OF THE DISCLOSURE A method and apparatus for repositioning garter springs around the pressure tubes of Candu-type nuclear reactors. A primary coil having a high permeability core is inserted into the pressure tube. The coil is energized by an alternating current of a frequency and amplitude sufficient to produce a primary alternating electromagnetic field that penetrates the wall and induces an eddy current in the garter spring. A secondary alternating electromagnetic field is also produced and is reactive with the primary field to produce a traveling electromagnetic field of sufficient intensity and of such direction that the resultant of the electromagnetic forces acting on the garter spring causes the spring to move along the tube.

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