Industrial electric heating furnaces – Induction furnace device – Coreless
Patent
1993-03-30
1995-07-04
Reynolds, Bruce A.
Industrial electric heating furnaces
Induction furnace device
Coreless
373152, 373154, H05B 622
Patent
active
054307589
ABSTRACT:
An induction crucible furnace has a furnace axis and a furnace coil generating magnetic flux. A magnetic yoke for the furnace includes a barlike lamination packet for guiding the magnetic flux. The lamination packet has a middle region and two lateral regions being adjacent the middle region and having borders facing away from the middle region. The lamination packet has a number of individual single laminations having edges and being electrically insulated from one another. The lamination packet has a main surface facing the furnace coil with a shape being sectioned into three parts for positioning the middle region relatively close to the furnace coil and defining a distance between the edges of the individual laminations and the furnace coil being increased in the two lateral regions toward the borders. Two peripheral regions face toward the furnace coil and have acute-angled, lamination-free sectors being parallel to the furnace axis.
REFERENCES:
patent: 1827274 (1931-10-01), Willcox
patent: 3704336 (1972-11-01), Synnestuedt
patent: 5247539 (1993-09-01), Gillhaus
"Mittelfreqenz-Induktions-Tiefenanlagen Typ ITMK", D ME/D 1182 89 D, pp. 1-8.
"Mittelfrequenz-Induktions-Tiefegelofenanlage", ABB, P. 1-8.
ABB Patent GmbH
Greenburg Laurence A.
Hoang Tu
Lerner Herbert L.
Reynolds Bruce A.
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