Process and means to control the average heating power induced i

Details Process and means to control the average heating power induced i Process and means to control the average heating power induced i

1983-02-08

1985-07-23

Envall, Jr., Roy N.

Electric heating

Metal heating

Of cylinders

219 1041, 219 1061R, 219 1077, H05B 500, H05B 600

Patent

active

045310378

ABSTRACT:
A method and system for controlling the heating of a product in an electromagnetic induction heating installation having a pair of essentially identical inductors placed on either side of the product with the poles of one of the inductors of the pair facing the poles of the other inductor. The average heating power electromagnetically induced in a moving or stationary, flat, conducting product positioned without contact by electromagnetic forces correlatively induced by the electromagnetic heating field is controlled by effecting a sequence of inversions of the instantaneous polarity of the poles of one of the inductors with respect to the instantaneous polarity of the corresponding poles of the other inductor. The ratio of the durations during which the polarities are on the one hand opposite and on the other identical determines the average value desired of the heating power induced, and the position of the product remaining practically unchanged by said inversions. The average heating power induced may be controlled by the inversions to effect a reduction of the heating power at the end of heating to thereby effect a reduction of dynamic temperature deviations due to the non-uniform distribution of the densities of the current induced.

REFERENCES:
patent: 3041434 (1962-06-01), Alf
patent: 4122321 (1978-10-01), Cachat
patent: 4296298 (1981-10-01), MacMaster et al.
patent: 4321444 (1982-03-01), Davies

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