(19)
(11) EP 0 487 832 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.06.1992 Bulletin 1992/25

(43) Date of publication A2:
03.06.1992 Bulletin 1992/23

(21) Application number: 91113800.6

(22) Date of filing: 16.08.1991
(51) International Patent Classification (IPC)5H05B 6/06, H05B 6/02
(84) Designated Contracting States:
AT DE FR GB IT SE

(30) Priority: 30.11.1990 JP 337069/90

(71) Applicant: SUMITOMO HEAVY INDUSTRIES, LTD
Tokyo 100 (JP)

(72) Inventors:
  • Inokuma, Masatomi
    Niihama-shi, Ehime (JP)
  • Oku, Isamu
    Niihama-shi, Ehime (JP)
  • Yoshimura, Nobuyuki
    Niihama-shi, Ehime (JP)

(74) Representative: VOSSIUS & PARTNER 
Postfach 86 07 67
81634 München
81634 München (DE)


(56) References cited: : 
   
       


    (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.







    Search report