Generating electromagnetic fields in a self regulating temperature heater by positioning of a current return bus
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United States of America Patent
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-
Nov 19, 1991
Issued Date -
N/A
app pub date -
Oct 31, 1990
filing date -
Nov 29, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A self-regulating heater includes an electrically-conductive substrate (11), having a magnetic surface layer (13) of one skin depth, folded 180 degrees to define two heater sections joined by a fold section. The magnetic material has a considerably higher resistance than the substrate material. The surface of the two sections clad with the surface layer are in closely spaced parallel relation and connected in series by the fold section (23) such that a constant amplitude alternating energizing current flows in opposite directions through the two sections at any instant of time to thereby establish an electric field between the two heaters. The field concentrates current flow at the two facing surfaces. Depth of the current is determined by the skin effect phenomenon and increases significantly at temperatures above the Curie temperature of the magnetic material.
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