H - Electricity – 05 – B
Patent
H - Electricity
05
B
309/99
H05B 6/00 (2006.01)
Patent
CA 1147381
ABSTRACT The heating element consists of a substrate of core of a non- magnetic material having high thermal and electrical conductivity, clad with a surface layer of a ferromagnetic material of relatively low electrical con- ductivity. When the heating element is energized by a source of high frequency alternating current, the skin effect initially confines current flow principally to the surface layer of ferromagnetic material. As temperature rises into the region of the Curie temperature of the ferromagnetic material, however, the decline in magnetic permeability of the ferromagnetic material causes a sig- nificant lessening of the skin effect, permitting migration of current into the high conductivity non-magnetic core, thereby simultaneously enlarging the cross-sectional area of the current flow path and expanding it into the highly conductive material; the resistance of the heating element becomes less due to both causes. By selecting the proper frequency for energization, by regulating the source to produce constant current, and by selecting dimensions and material parameters for the heating element, temperature regulation in a narrow range around the Curie temperature of the ferromagnetic material can be produced, de- spite considerable fluctuations in thermal load.
373106
Carter Philip S.
Krumme John F.
Iris Associates
Smart & Biggar
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