Electric heating – Heating devices – With heating unit structure
Patent
1983-10-19
1987-09-22
Albritton, C. L.
Electric heating
Heating devices
With heating unit structure
219 1079, 219233, H05B 310
Patent
active
046957138
ABSTRACT:
An autoregulating, electrically shielded heater employs a laminated structure having two magnetic alloy permeable materials of widely differing Curie point temperatures and preferably of differing resistivities. A constant current supply is connected across the laminate such that current flows in the laminae along parallel paths. Due to skin effect, the current is confined to a thin region of a first lamina which is located between the other lamina and the electrical return path. This first lamina has the lower Curie temperature and preferably the higher resistivity of the two laminae to produce heating proportional to I.sup.2 R.sub.1. When the Curie temperature of the first lamina is approached, the current spreads into the other lamina which may have a lower resistivity and higher Curie temperature and heating is obtained by I.sup.2 R.sub.2 where I.sup.2 is a constant due to the constant current source and preferably R.sub.2 <R.sub.1. Thus, power is reduced and temperature is maintained at or about the Curie temperature of the first layer. The high permeability of the second lamina prohibits the current from penetrating deeply into the second laminae whereby a low frequency power supply may be used without radiation of the electro-magnetic field.
REFERENCES:
patent: 1975436 (1934-10-01), Sorrel et al.
patent: 2181274 (1939-11-01), Jackson et al.
patent: 3218384 (1965-11-01), Shaw
patent: 3296364 (1967-01-01), Mason
patent: 3515837 (1970-06-01), Ando
patent: 3584190 (1971-06-01), Marcoux
patent: 4079192 (1978-03-01), Josse
patent: 4091813 (1978-05-01), Shaw et al.
patent: 4110599 (1978-08-01), Offermann
patent: 4185632 (1980-01-01), Shaw
patent: 4207896 (1980-06-01), Shaw
patent: 4256945 (1981-03-01), Carter et al.
patent: 4364390 (1982-12-01), Shaw
patent: 4366356 (1982-12-01), Ando
Albritton C. L.
Metcal Inc.
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