Induction furnace with improved efficiency coil system

Details Induction furnace with improved efficiency coil system Induction furnace with improved efficiency coil system

H - Electricity

05

B

H05B 6/06 (2006.01) H05B 6/24 (2006.01)

Patent

CA 2424051

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.

L'invention concerne un système de four à induction doté d'une bobine d'induction active entourant un creuset. Une bobine d'induction passive entoure également ledit creuset, cette bobine étant montée en parallèle avec un condensateur afin de former un circuit de réservoir L-C. Une source de courant C.A. est fournie de façon à activer la bobine d'induction active, et produire un champ magnétique qui chauffe et fait fondre par induction un matériau électroconducteur dans le creuset. Ledit champ magnétique est magnétiquement couplé avec la bobine d'induction passive afin d'induire un courant dans ladite bobine. Le courant induit génère un champ magnétique qui chauffe et fait fondre le matériau par induction. La résistance du circuit de réservoir L-C est renvoyée dans le circuit de la bobine d'induction active afin d'améliorer l'efficacité globale du système de four à induction. Le creuset peut être ouvert à une extrémité afin que le matériau électroconducteur traverse ledit creuset pendant le processus de chauffage.

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