EP 0100441 A1 19840215 - Device for inductively heating a workpiece by multiple inductors.
Title (en)
Device for inductively heating a workpiece by multiple inductors.
Title (de)
Einrichtung zur induktiven Erwärmung eines Werkstückes mittels mehrerer Induktoren.
Title (fr)
Dispositif pour le chauffage à induction d'une pièce usinée au moyen d'inducteurs multiples.
Publication
Application
Priority
DE 3224738 A 19820702
Abstract (en)
1. Apparatus for inductivity heating of a work-piece comprising - a number n of parallel-resonant circuits each consisting of a condenser (C1 , C2 ) and an inductor (L1 , L2 ), with n>1, - a corresponding number of inverted converters (W1 , W2 ) correlated to each of the parallel-resonant circuits for separately feeding the individual parallel-resonant circuits with alternating current, - a controlled rotary current rectifier arrangement (D) for feeding said inverted converters with direct current, - a throttle device (L) located between the rotary current rectifier arrangement and said inverted converters, - a clearing condition regulator (CR) for charging the inverted converter valve elements with equal frequency igniting pulses determining the clearing time or clearing angle of said elements, characterized in that - said rotary current rectifier arrangement consists of a single fully controlled bridge circuit common to all of said inverted converters (W1 , W2 ) - all of said inverted converters (W1 , W2 ) parallely connected to said bridge circuit are connected by means of a throttle device comprising a smoothing reactor (D) to said bridge circuit, - and that the clearing condition regulator (CR) comprises means for causing a phase displacement between the igniting pulses for the various inverted converters causing a size pi/n phase displacement between the alternating currents passing said inductors.
Abstract (de)
Die Erfindung bezieht sich auf eine Einrichtung zur induktiven Erwärmung eines Werkstückes mittels mehrerer Induktoren. Um die von den Wechselrichtern (W1, W2) ausgehende Rückwirkung auf das Netz bei niedrigen Frequenzen, insbesondere unter 0,15 kHz zu vermindern, werden die verschiedenen Wechselrichterstromquellen mit umπ/n phasenversetzten Zündimpulsen derselben Frequenz bei n-Wechselrichterstromquellen betrieben.
IPC 1-7
IPC 8 full level
H05B 6/02 (2006.01); H05B 6/06 (2006.01); H05B 6/10 (2006.01)
CPC (source: EP)
H05B 6/06 (2013.01)
Citation (search report)
- DE 3040820 A1 19820513 - AEG ELOTHERM GMBH [DE]
- DE 2521941 A1 19751120 - MATSUSHITA ELECTRIC IND CO LTD
- DE 2937941 A1 19800327 - MATSUSHITA ELECTRIC IND CO LTD
- DE 2559519 A1 19770310 - MATSUSHITA ELECTRIC IND CO LTD
Designated contracting state (EPC)
AT BE FR GB IT LU NL SE
DOCDB simple family (publication)
EP 0100441 A1 19840215; EP 0100441 B1 19860917; AT E22382 T1 19861015; DE 3224738 C1 19840209; JP S5968193 A 19840418
DOCDB simple family (application)
EP 83106406 A 19830701; AT 83106406 T 19830701; DE 3224738 A 19820702; JP 11839183 A 19830701