H - Electricity – 05 – B
Patent
H - Electricity
05
B
309/96
H05B 1/02 (2006.01) G05D 23/19 (2006.01) G05D 23/26 (2006.01) H05B 3/00 (2006.01) H05B 6/06 (2006.01)
Patent
CA 1251254
FERROMAGNETIC ELEMENT WITH TEMPERATURE REGULATION ABSTRACT OF THE DISCLOSURE: A ferromagnetic element has current passed through it either by direct electrical connections or by induction. The current through the ferromagnetic element may be far greater than is necessary to heat the element above its effective Curie temperature. As the element is heated and is passing through its effective Curie transition (that is its temperature is rising from below its effective Curie temperature to, or above, its effective Curie temperature) the change in permeability of the element is sensed and the current through the element is cut off. The element then cools. When the temperature falls below the effective Curie temperature, the full current is restored. The heating and cooling process repeats itself indefinitely. The result is that the element is maintained at its effective Curie by a pulsating current fed to the element. The Curie transition may be sensed by directly sensing changes in permeability as by an auto-transformer winding, on the element; or by sensing changes in the power to the element by reason of the change in resistance of the element as it passes through the effective Curie temperature. PAT6376
512138
Marks & Clerk
Metcal Inc.
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