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(11) | EP 0 487 832 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Electromagnetic induction heater capable of realizing a wide variety of heating rates |
(57) In an electromagnetic induction heater for use in heating, by electromagnetic induction,
a strip which is transported in a predetermined direction, a plurality of coil elements
(15a,b) are selectively supplied from a power source (20) or sources with currents
under control of a power controller (22). The power controller (22) has a plurality
of relays (R1,R2,R3) which are selectively operable under control of a relay control
circuit (2) and which have contacts (R1a...R3b) connected to the coil elements (15a,b).
With this structure, the coil elements (15a,b) are selectively energized to locally
generate magnetic fields, which serves to realize a wide variety of heating rates. |