Electromagnetic apparatus for positioning objects located behind a conductive wall
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United States of America Patent
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Mar 20, 1990
Issued Date -
N/A
app pub date -
Jul 26, 1988
filing date -
Jul 23, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 travelling 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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