Levitation heating using single variable frequency power supply

Details Levitation heating using single variable frequency power supply Levitation heating using single variable frequency power supply

1985-08-01

1986-03-25

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 75, 219 1067, 219 1075, 219 1077, 219 1079, H05B 632

Patent

active

045785520

ABSTRACT:
A levitation heating system uses only a single power supply for both levitation and heating, but permits the frequency of the power supply to be changed to control heating effects independently of levitation forces. The levitation force is kept constant by changing the apparent impedance of the induction and levitation coil as the frequency is changed, thereby providing a constant applied current to the coil over a range of applied frequencies. Feedback is employed to assure constant current in the coil.

REFERENCES:
patent: 1642198 (1927-09-01), Gerth et al.
patent: 2664496 (1953-12-01), Brace
patent: 2686864 (1954-08-01), Wroughton et al.
patent: 2957064 (1960-10-01), Comenetz
patent: 3354285 (1967-11-01), Rexer

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