Industrial electric heating furnaces – Induction furnace device – Coreless
Patent
1995-06-07
1997-09-23
Hoang, Tu B.
Industrial electric heating furnaces
Induction furnace device
Coreless
373154, H05B 622
Patent
active
056712456
ABSTRACT:
A magnetic yoke for an induction crucible furnace includes a bar-shaped core stack for conducting magnetic flux generated by a furnace coil of the furnace. The core stack is formed of a multiplicity of individual, mutually electrically insulated single laminations with edges. The core stack has a first principal surface facing the furnace coil and three second principal surfaces not facing the furnace coil. The first principal surface has a shape being subdivided three-fold, defining a central region of the core stack to be positioned very near the furnace coil and two lateral regions of the core stack adjacent the central region, and defining a distance between the edges of the single laminations of the core stack and the furnace coil being increased towards the edge in the two lateral regions of the core stack, forming acute-angled, lamination-free sectors parallel to the furnace axis in two peripheral regions of the magnetic yoke being directed towards the furnace coil. An insulating body is formed of an electrically insulating and vibration-damping material. A carrier body has a U-shaped or C-shaped cross section and lateral walls at which the insulating body is mounted. The carrier body encloses the second three principal surfaces. The insulating body extends surface-wide from one to another of the lateral walls of the carrier body. Both the lateral walls of the carrier body and the core stack press the magnetic yoke surface-wide through the insulating body against the furnace coil.
REFERENCES:
patent: 5247539 (1993-09-01), Gillhaus
patent: 5430758 (1995-07-01), Gillhaus
Aundrup Christoph
Mertens Manfred
Nacke Bernard
ABB Patent GmbH
Greenberg Laurence A.
Hoang Tu B.
Lerner Herbert L.
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