Electric heating – Metal heating – Of cylinders
Patent
1978-03-28
1980-06-17
Reynolds, B. A.
Electric heating
Metal heating
Of cylinders
219 1061R, H05B 508
Patent
active
042085608
ABSTRACT:
An inductively heated godet is mounted on a supporting frame which carries a rotatable drive shaft. A stationary primary winding is mounted about a magnetic core carried by a body which is fastened to the frame. A rotatable hollow shell which concentrically surrounds the primary winding is removably secured to the rotatable drive shaft.
The magnetic core and rotatable hollow shell have in their longitudinal section essentially opposing L-shaped profiles with the flank portions thereof being concentric to the godet turning axis and the foot portion of each L-shaped profile extending substantially radially with respect to the godet turning axis toward the opposing flank portion of the other L-shaped profile such that the flank and foot portions of the shell and magnetic core form radially spaced annular gaps therebetween which are concentric to the godet turning axis. In addition, the axially directed gaps necessarily formed between the magnetic core and rotatable hollow shell are relatively large with respect to the annular gaps so that magnetic flux created by the primary winding will flow almost entirely over the smaller annular gaps. In one embodiment, the foot portion of the L-shaped profile of the shell has a recess formed therein which may be filled with an electrically conductive material which helps direct the magnetic flux and increase the heating effect in that zone of the shell. In another embodiment, the primary winding is formed of multiple electrically interconnected partial coils which are slidable on to the magnetic core.
REFERENCES:
patent: 2882378 (1959-04-01), Ticeherst
patent: 3363079 (1968-01-01), Schroyer
patent: 3412228 (1968-11-01), Miyagi
patent: 3487187 (1969-12-01), Martens et al.
patent: 3701873 (1972-10-01), Bauer et al.
patent: 3772492 (1973-11-01), Brogden et al.
patent: 3790736 (1974-02-01), Matsumura et al.
Honigmann Gunter
Martens Gerhard
Schewe Lothar
Turk Herbert
Barmag Barmer Maschinenfabrik AG
Leung Philip H.
Reynolds B. A.
Shurtleff John H.
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