EP0090676A1 - Verfahren und Vorrichtung zum Regeln der mittleren induzierten Heizleistung in einem flachen leitenden Erzeugnis welches elektromagnetisch ohne Kontakt an Stelle gehalten wird - Google Patents

Verfahren und Vorrichtung zum Regeln der mittleren induzierten Heizleistung in einem flachen leitenden Erzeugnis welches elektromagnetisch ohne Kontakt an Stelle gehalten wird Download PDF

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Publication number
EP0090676A1
EP0090676A1 EP83400258A EP83400258A EP0090676A1 EP 0090676 A1 EP0090676 A1 EP 0090676A1 EP 83400258 A EP83400258 A EP 83400258A EP 83400258 A EP83400258 A EP 83400258A EP 0090676 A1 EP0090676 A1 EP 0090676A1
Authority
EP
European Patent Office
Prior art keywords
poles
product
induced
inductors
power
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83400258A
Other languages
English (en)
French (fr)
Other versions
EP0090676B1 (de
Inventor
Jean-Paul Camus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alstom SA
Original Assignee
Compagnie Electro Mecanique SA
Alstom SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Compagnie Electro Mecanique SA, Alstom SA filed Critical Compagnie Electro Mecanique SA
Publication of EP0090676A1 publication Critical patent/EP0090676A1/de
Application granted granted Critical
Publication of EP0090676B1 publication Critical patent/EP0090676B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/10—Induction heating apparatus, other than furnaces, for specific applications
    • H05B6/101—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces
    • H05B6/103—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor
    • H05B6/104—Induction heating apparatus, other than furnaces, for specific applications for local heating of metal pieces multiple metal pieces successively being moved close to the inductor metal pieces being elongated like wires or bands
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power

Definitions

  • the present invention relates to a method and to devices for implementing this method allowing the adjustment of the average heating power induced by an electromagnetic field in a flat conductive product when stopped or running, maintained without contact, by the electromagnetic forces also induced by this field, in particular in levitation or guidance, in an electromagnetic induction heating installation comprising a pair of substantially identical inductors whose poles face each other in pairs on either side of the product.
  • the object of the invention is to regulate in the widest possible range the heating power induced in a flat conductive product maintained without contact, by the correspondingly induced electromagnetic forces, in particular in levitation or guidance, by ensuring the product a substantially constant position. and using simple and economical equipment.
  • the method according to the invention consists, for adjusting the heating power induced by an electromagnetic field in a flat conductive product maintained without contact by the electromagnetic forces correlatively induced by this field, in an electromagnetic induction heating installation comprising a pair of substantially identical inductors, arranged on either side of the product, the poles of one of the inductors of the pair facing the poles of the other inductor, to operate a series of reversals of the instantaneous polarity of the poles of the one of the inductors with respect to the instantaneous polarity of the corresponding poles of the other inductor, the ratio of the durations during which the polarities are on the one hand opposite and on the other hand identical determining the average value of the induced heating power, the position of the product remaining almost unchanged.
  • the Applicant has discovered the following new result, namely that the electromagnetic forces exerted on the product and which maintain it without contact remain substantially the same as the instantaneous polarities of the poles two to two facing. face of the inductors are all identical or all opposite, all other things remaining equal, so that during an inversion of the relative polarity of the poles of one of the inductors with respect to the polarity of the corresponding poles of the other inductor , the position of the product remains almost unchanged.
  • the invention applies in particular to heating installations in levitation or, for example, heating with guidance for which it is necessary to maintain restoring forces, of substantially constant intensity, towards an equilibrium position.
  • the instantaneous polarity inversions of the poles of one of the inductors with respect to the instantaneous polarity of the corresponding poles of the other inductor are carried out by the polarity reverser which operates for example an inversion of the connection of one of the inductors to the alternative current or voltage source (the voltage / current ratio is different depending on whether the polarities are identical or opposite).
  • a device comprises, in one form, this embodiment, m generating this duty cycle, the frequency of which is a function of the desired adjustment precision, this in order to allow rigorously following an imposed temperature curve as a function of time.
  • the polarity reverser is of the static type, consisting of two rectifier bridges in anti-parallel mounting.
  • the adjustment device further comprises interposed between the adjustment system (C) and the inverter (A), a duty cycle generator (B) whose frequency is a function of the desired adjustment precision.
  • This arrangement makes it possible, in particular, to rigorously follow an imposed temperature curve as a function of time.
  • the polarity reverser (A) consists of two rectifier bridges in anti-parallel mounting, but this choice is in no way limiting.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
EP83400258A 1982-03-12 1983-02-07 Verfahren und Vorrichtung zum Regeln der mittleren induzierten Heizleistung in einem flachen leitenden Erzeugnis welches elektromagnetisch ohne Kontakt an Stelle gehalten wird Expired EP0090676B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8204181A FR2523395A1 (fr) 1982-03-12 1982-03-12 Procede et dispositif de reglage de la puissance moyenne de chauffage induite dans un produit plat conducteur maintenu electromagnetiquement en position sans contact
FR8204181 1982-03-12

Publications (2)

Publication Number Publication Date
EP0090676A1 true EP0090676A1 (de) 1983-10-05
EP0090676B1 EP0090676B1 (de) 1987-04-22

Family

ID=9271917

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400258A Expired EP0090676B1 (de) 1982-03-12 1983-02-07 Verfahren und Vorrichtung zum Regeln der mittleren induzierten Heizleistung in einem flachen leitenden Erzeugnis welches elektromagnetisch ohne Kontakt an Stelle gehalten wird

Country Status (5)

Country Link
US (1) US4531037A (de)
EP (1) EP0090676B1 (de)
JP (1) JPS58169789A (de)
DE (1) DE3371157D1 (de)
FR (1) FR2523395A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5483042A (en) * 1990-06-04 1996-01-09 Nordson Corporation Magnetic separator
US5529703A (en) * 1990-06-04 1996-06-25 Nordson Corporation Induction dryer and magnetic separator
US5847370A (en) * 1990-06-04 1998-12-08 Nordson Corporation Can coating and curing system having focused induction heater using thin lamination cores
ZA9210102B (en) * 1992-02-10 1993-08-24 Heron Tech Inc Induction dryer and magnetic separator
WO1993023970A1 (en) * 1992-05-08 1993-11-25 Heron Technologies, Inc. Induction dryer and magnetic separator
JPH08222619A (ja) * 1995-02-14 1996-08-30 Toshiba Corp 半導体製造装置
CA2789978C (en) 2010-02-19 2015-11-24 Nippon Steel Corporation Transverse flux induction heating device

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE903847C (de) * 1943-01-12 1954-02-11 Deutsche Edelstahlwerke Ag Vorrichtung zum einseitigen elektro-induktiven Erhitzen von Werkstuecken
FR1501271A (fr) * 1965-11-15 1967-11-10 Westinghouse Electric Corp Appareil de traitement thermique
FR1576364A (de) * 1967-12-12 1969-08-01
DE2609978A1 (de) * 1975-03-10 1976-09-30 Electricity Council Verfahren und einrichtung zur erwaermung eines bandfoermigen oder laenglichen werkstuecks
GB1453489A (en) * 1974-03-07 1976-10-20 Electricity Council Processing of billets slabs strips and other metal workpieces
FR2334755A1 (fr) * 1975-12-12 1977-07-08 Sundwiger Eisen Maschinen Procede et installation pour le chauffage de bandes metalliques, notamment de bandes metalliques non ferreuses
DE2622825A1 (de) * 1976-05-21 1977-12-01 Siemens Ag Schaltungsanordnung zur regelung der heizleistung einer kontinuierlich arbeitenden erwaermungsanlage
US4122321A (en) * 1977-02-16 1978-10-24 Park-Ohio Industries, Inc. Induction heating furnace

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL243545A (de) * 1958-09-19 1900-01-01
FR1389902A (fr) * 1964-03-27 1965-02-19 Procédé et dispositif pour le transport de feuillards, profilés, tubes et produits analogues en une matière conduisant le courant électrique, de préférence à travers un four de passage
US4321444A (en) * 1975-03-04 1982-03-23 Davies Evan J Induction heating apparatus
US4296298A (en) * 1978-06-12 1981-10-20 Raytheon Company Dielectric cooking apparatus
FR2521797B1 (fr) * 1982-02-18 1985-12-06 Cem Comp Electro Mec Procede et dispositifs pour minimiser la puissance induite dans un produit plat conducteur maintenu electromagnetiquement sans contact

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE903847C (de) * 1943-01-12 1954-02-11 Deutsche Edelstahlwerke Ag Vorrichtung zum einseitigen elektro-induktiven Erhitzen von Werkstuecken
FR1501271A (fr) * 1965-11-15 1967-11-10 Westinghouse Electric Corp Appareil de traitement thermique
FR1576364A (de) * 1967-12-12 1969-08-01
GB1453489A (en) * 1974-03-07 1976-10-20 Electricity Council Processing of billets slabs strips and other metal workpieces
DE2609978A1 (de) * 1975-03-10 1976-09-30 Electricity Council Verfahren und einrichtung zur erwaermung eines bandfoermigen oder laenglichen werkstuecks
FR2334755A1 (fr) * 1975-12-12 1977-07-08 Sundwiger Eisen Maschinen Procede et installation pour le chauffage de bandes metalliques, notamment de bandes metalliques non ferreuses
DE2622825A1 (de) * 1976-05-21 1977-12-01 Siemens Ag Schaltungsanordnung zur regelung der heizleistung einer kontinuierlich arbeitenden erwaermungsanlage
US4122321A (en) * 1977-02-16 1978-10-24 Park-Ohio Industries, Inc. Induction heating furnace

Also Published As

Publication number Publication date
US4531037A (en) 1985-07-23
EP0090676B1 (de) 1987-04-22
DE3371157D1 (en) 1987-05-27
FR2523395B1 (de) 1984-06-01
FR2523395A1 (fr) 1983-09-16
JPH0221116B2 (de) 1990-05-11
JPS58169789A (ja) 1983-10-06

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