Generating electromagnetic fields in a self regulating temperatu

Details Generating electromagnetic fields in a self regulating temperatu Generating electromagnetic fields in a self regulating temperatu

1988-11-29

1991-02-05

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 851, 219209, 219542, H05B 600

Patent

active

049907360

ABSTRACT:
A self-redulanting 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 surfaces 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.

REFERENCES:
patent: 4256945 (1981-03-01), Carter
patent: 4623401 (1986-11-01), Derbyshire
patent: 4626767 (1986-12-01), Clappier
patent: 4659912 (1987-04-01), Derbyshire
patent: 4695712 (1987-09-01), Busch
patent: 4695713 (1987-09-01), Krumme
patent: 4701587 (1987-10-01), Carter
patent: 4717814 (1988-01-01), Krumme
patent: 4745264 (1988-05-01), Carter
patent: 4788404 (1988-11-01), Kent
patent: 4814587 (1989-03-01), Carter
patent: 4849611 (1989-07-01), Whitney et al.

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