Shielded heating element having intrinsic temperature control

Details Shielded heating element having intrinsic temperature control Shielded heating element having intrinsic temperature control

H - Electricity

05

B

309/105, 327/85

H05B 3/10 (2006.01) B23K 3/047 (2006.01)

Patent

CA 1219644

SHIELDED HEATING ELEMENT HAVING INTRINSIC TEMPERATURE CONTROL ABSTRACT A heating element consists of a substrate or 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 conductivity. 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 significant 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; whereby the resistence of the heating material becomes less, due to both effects. However, the structure is shielded by the provision of an outer layer, the thickness of which will depend on the frequency to be employed, whereby electromagnetic radiation from the structure is substantially precluded. Preferably, the thickness of the outer layer is at least three (3) skin depths, and usually five to 10 skin depths.

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