Electromagnetic apparatus having adjusting effective core gap
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United States of America Patent
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Jul 22, 2003
Grant Date -
Apr 17, 2003
app pub date -
Oct 12, 2001
filing date -
Oct 12, 2001
priority date (Note) -
Expired
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Abstract
An electromagnetic apparatus having an adjusting effective core gap includes: (a) an electrical winding; and (b) a ferrous core situated proximal with the electrical winding. The core has a first terminus and a second terminus arranged in spaced relation to establish a gap distance between the termini in a region in substantial register with the termini. The winding and the core cooperate to establish an inductance related with an electrical current applied to the winding. At least one terminus of the termini has a configuration responsive to varying the current by effecting selective local saturation of successive portions of the at least one terminus for successive values of the current. The selective local saturation establishes successive new effective gap distances. Each respective new effective gap distance is appropriate for establishing a successive new optimum inductance for the current value then extant.
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