Shielding method and shielding apparatus
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United States of America Patent
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May 27, 2008
Grant Date -
Apr 28, 2005
app pub date -
Oct 21, 2004
filing date -
Oct 23, 2003
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A canceling exciting coil is supported by a coil supporting member of electrically insulating material fitted to an arch core. A canceling current Ic of opposite phase to a main current I flowing in the magnetic field generation circuit of the exciting coil by means of an exciting circuit is made to flow in a canceling magnetic field generation circuit provided with a canceling exciting coil, and generates canceling flux Mc. The idle component of the AC voltage generated in the canceling exciting coil is minimized by changing the number of turns n, coil inner area, and winding distribution of the canceling exciting coil, and adjusting canceling current Ic.
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