Cold crucible induction furnace with eddy current damping

Details Cold crucible induction furnace with eddy current damping Cold crucible induction furnace with eddy current damping

2007-01-17

2010-12-07

Van, Quang T (Department: 3742)

Industrial electric heating furnaces

Induction furnace device

Power supply system

C373S138000

Reexamination Certificate

active

07848383

ABSTRACT:
Apparatus and method are provided for damping the induced fluid flow, particularly in the region of the base plate, in an electrically conductive material that is heated and melted in a cold crucible induction furnace. Damping is accomplished by establishing a dc magnetic field such that flow of the electrically conductive liquid metal in that dc magnetic field would induce eddy currents in the liquid metal which would generate forces that tend to oppose the flow. The dc magnetic field may be established by dc current flow in the ac induction coil that induces current in the material, dc current flow in a separate dc coil, or coils, constructed to prevent excessive induced losses, by discrete magnets, or a combination of any of the three prior methods.

REFERENCES:
patent: 3478156 (1969-11-01), Segsworth
patent: 3544691 (1970-12-01), Adamec
patent: 5109389 (1992-04-01), Stenzel
patent: 5901169 (1999-05-01), Kobayashi
patent: 6304590 (2001-10-01), Roberts
patent: 2004/0136762 (2004-07-01), Okayasu et al.

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