Alternating current electrically resistive heating element havin

Details Alternating current electrically resistive heating element havin Alternating current electrically resistive heating element havin

1979-08-31

1981-03-17

Mayewsky, Volodymyr Y.

Electric heating

Metal heating

Of cylinders

13 26, 13 25, 219 1079, 219229, 219553, 336 73, H05B 500

Patent

active

042569451

ABSTRACT:
The 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; 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, despite considerable fluctuations in thermal load.

REFERENCES:
patent: 1975436 (1934-10-01), Sorrel et al.
patent: 2181274 (1939-11-01), Jackson et al.
patent: 2513778 (1950-07-01), Bailey
patent: 3218384 (1965-11-01), Shaw
patent: 3660585 (1972-05-01), Waldron
patent: 3975819 (1976-08-01), Ando
patent: 4017344 (1977-04-01), Lorber et al.
patent: 4079192 (1978-03-01), Josse

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