H - Electricity – 05 – B
Patent
H - Electricity
05
B
327/21
H05B 6/14 (2006.01) D21F 5/02 (2006.01) D21F 7/06 (2006.01) D21G 1/02 (2006.01) H05B 6/06 (2006.01)
Patent
CA 1226041
ABSTRACT OF THE DISCLOSURE A method is disclosed for heating a roll by electro- magnetic induction, in particular a calender roll, used in the manufacture of paper or of some other web-formed product. In the method, a variable magnetic flux is applied to the mantle by a magnetic shoe device through air gaps. The magnetic flux in- duces eddy currents in the mantle, which generate heat owing to the resistance of the roll mantle. The magnetic flux is applied to the roll mantle by means of a magnetic shoe device comprising several component cores side by side. The magnitude of the air gap between the component cores and the face of the roll mantle and/or the magnetizing currents is adjusted so as to control the distribution of the heating effect in the axial direction of the roll. As the frequency (f) of the magnetizing current of the component cores is selected at such a high frequency that a suf- ficiently low depth of penetration of the heating effect is ob- tained. The component cores of the magnetizing device are each separately arranged so that their positions in the radial plane can be adjusted for the purpose of completely or partially controlling of the heating effect in the axial direction. The device comprises power supply means for supplying the coils with alternating current of an appropriate constant or variable fre- quency (f).
464676
Marks & Clerk
Valmet Oy
LandOfFree
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