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Title:
INDUCTION FURNACE WITH IMPROVED EFFICIENCY COIL SYSTEM
Document Type and Number:
WIPO Patent Application WO2002054831
Kind Code:
A3
Abstract:
An induction furnace system has an active induction coil surrounding a crucible. A passive induction coil also surrounds the crucible. The passive induction coil is connected in parallel with a capacitor to form an L-C tank circuit. A source of ac current is provided to the active induction coil to produce a magnetic field that inductively heats and melts an electrically conductive material in the crucible. The magnetic field also magnetically couples with the passive induction coil to induce a current in the passive induction coil. This induced current generates a magnetic field that inductively heats and melts the material. The resistance of the L-C tank circuit is reflected back into the circuit of the active induction coil to improve the overall efficiency of the induction furnace system. The crucible may be open-ended to allow the passage of the electrically conductive material through the crucible during the heating process.

Inventors:
FISHMAN OLEG S
NADOT VLADIMIR V
PEYSAKHOVICH VITALY A
MORTIMER JOHN H
Application Number:
PCT/US2002/000236
Publication Date:
October 03, 2002
Filing Date:
January 07, 2002
Export Citation:
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Assignee:
INDUCTOTHERM CORP (US)
International Classes:
F27B14/06; F27B14/14; F27D11/06; F27D99/00; H05B6/24; (IPC1-7): H05B6/06
Foreign References:
US4633481A1986-12-30
US2570311A1951-10-09
US2090692A1937-08-24
US3331909A1967-07-18
US5490869A1996-02-13
US4037044A1977-07-19
US5940427A1999-08-17
Other References:
See also references of EP 1350415A4
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