Composite electromagnetic coil

Details Composite electromagnetic coil Composite electromagnetic coil

1975-01-31

1976-11-16

Kozma, Thomas J.

Inductor devices

Coils with temperature compensating means

335299, 336180, 336222, 338 9, H01F 1516

Patent

active

039926907

ABSTRACT:
This electromagnetic coil is composed of concentric multi-turn windings in magnetic aiding relationship, one winding being formed of copper wire and the other of wire made of copper contaminated with a minor percentage of a metal having a different coefficient of resistance than copper. The wires of both windings having a positive temperature coefficient of resistance, one being less than the other so that the power demands of the coil at low temperatures will be reduced with a minimum loss in hot ampere turns. The wire of copper contaminated with the other metal is of a smaller gage size and the thickness of the winding of such wire bears a predetermined ratio to the total of both windings whereby they will have substantially equal heat densities.

REFERENCES:
patent: 1972319 (1934-09-01), Rypinski
patent: 2082121 (1937-06-01), Rypinski
patent: 3378763 (1968-04-01), Hastings
patent: R10944 (1888-07-01), Weston

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