渦電流ダンピングを用いるコールドクルーシブル誘導加熱炉

Japanese Patent JP5128134

B2

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. The dc magnetic field may also be established by dc current flow in one or more dc coils disposed around a magnetic pole piece located below the base of the furnace. One end of the magnetic pole piece is located adjacent to the bottom of the crucible base, so that the pole piece concentrates the dc field into the lower portion of the molten electrically conductive material.

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Raymond Jay Roberts
Graham A. Kio

JP2006549697A

January 23, 2013

January 14, 2005

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CONSARC CORPORATION

F27B14/14; F27D3/00; F27D11/06; H05B6/04; H05B6/06; H05B6/24; H05B6/44

JP2287091A
JP8136162A
JP2004147964A

Motohiro Kurauchi
Endo Azusa
Takumi Yoshida
Taku Nakajima

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