Induction heating apparatus

Details Induction heating apparatus Induction heating apparatus

1987-05-21

1988-10-18

Leung, Philip H.

Electric heating

Metal heating

Of cylinders

219 1071, 219 1079, 219 1043, H05B 640

Patent

active

047789719

ABSTRACT:
An induction heating apparatus for utilizing electromagnetic induction to heat a workpiece. The apparatus includes a pair of heating coil units disposed in spaced-parallel relation to permit transportion of the workpiece between the heating coil units. Each of the heating coil units includes a main heating coil and an auxiliary heating coil disposed at a position adjacent to the main heating coil. The main heating coil has a plurality of spaced-parallel transverse conductors connected in series and produces magnetic field crossing the workpiece, causing heating when supplied with a high- or intermediate-frequency alternating current. The auxiliary heating coil includes a pair of series connected longitudinal conductors placed at positions facing to the workpiece at a small distance inside from the respective opposite side edges of the workpiece. The auxiliary heating coil is supplied with a high- or intermediate-frequency alternating current to heat the workpiece in a manner to compensate the temperature ununiformity provided by the main heating coil so as to provide good temperature uniformity over the full width of the workpiece.

REFERENCES:
patent: 3562470 (1971-02-01), Bobart et al.
patent: 3699302 (1972-10-01), Griffith
patent: 3840138 (1974-10-01), Mohr
patent: 4054770 (1977-10-01), Jackson et al.
patent: 4315124 (1982-02-01), Granstrom et al.

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