EP0462011A1 - Induktionsheizspule - Google Patents

Induktionsheizspule Download PDF

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Publication number
EP0462011A1
EP0462011A1 EP91401572A EP91401572A EP0462011A1 EP 0462011 A1 EP0462011 A1 EP 0462011A1 EP 91401572 A EP91401572 A EP 91401572A EP 91401572 A EP91401572 A EP 91401572A EP 0462011 A1 EP0462011 A1 EP 0462011A1
Authority
EP
European Patent Office
Prior art keywords
conductor
tube
strands
coil
transposition
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
EP91401572A
Other languages
English (en)
French (fr)
Other versions
EP0462011B1 (de
Inventor
Jean Hellegouarc'h
Gérard Prost
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.)
Rotelec SA
Original Assignee
Rotelec SA
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Filing date
Publication date
Application filed by Rotelec SA filed Critical Rotelec SA
Publication of EP0462011A1 publication Critical patent/EP0462011A1/de
Application granted granted Critical
Publication of EP0462011B1 publication Critical patent/EP0462011B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H05B6/36—Coil arrangements
    • H05B6/42—Cooling of coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F2038/003—High frequency transformer for microwave oven

Definitions

  • the present invention relates generally to electromagnetic induction heating. It applies in particular, although not exclusively, to the heating of the edges of flat metallurgical products having to undergo hot deformation. Such products are in particular steel products which must be heated or reheated before being flattened and / or expanded by passing between the rollers of a rolling mill.
  • the presence of the capacitive assembly allows the coil to run through a current of much greater intensity than that of the current supplied by the electric generator. The latter then supplies only active power actually consumed by the device, "reactive power", for example 10 times greater, being supplied by the capacitive assembly.
  • the product to be heated often runs at high speed and may have irregularities which make it necessary to plan a long passage interval.
  • the temperature of this product is often such that a thermally insulating layer must be provided on either side of this passage interval to protect the coil and the adjoining electrotechnical structure.
  • the air gap of the magnetic circuit must be large, which results in the presence of a large magnetic flux in the region of the coil. This leakage flow is partially useless for heating the product to be heated, but it induces currents in the conductors of the coil and therefore significant parasitic heating affecting these conductors.
  • Patent document US-A-4 176 237 further describes an induction furnace for liquid metal.
  • This oven is provided with an inductive heating coil comprising conductors connected in parallel between two electrical terminals of this coil, each said conductor comprising a cooling tube, the transport of current in this conductor being distributed between strands applied in thermal contact. against the walls of this tube, the length of this conductor comprising zones of strong deformation in which it undergoes particularly intense deformations carrying out transpositions of conductors and strands to limit the formation of stray current loops.
  • the present invention aims in particular to allow a simple manufacturing of a heating coil which is compact and which limits the energy losses of an induction heating device.
  • the transport of current in each conductor of the coil is distributed between strands which remain applied in thermal contact against a cooling tube of this conductor even in transposition or twisting zones where this conductor has undergone particularly intense deformations , this conductor having at least a twist of a half-turn between the electrical terminals of the coil.
  • FIG. 1 represents a view of a device for heating strands including two coils according to the present invention.
  • Figure 2 shows an electrical diagram of this device.
  • FIG. 3 represents an overall view in elevation of a coil of FIG. 1.
  • FIG. 4 represents a bottom view of the coil of FIG. 3.
  • FIG. 5 represents a partially cut away perspective view of a lower part of this same coil.
  • FIG. 6 represents a developed view of a bar of this same coil in this same lower part.
  • Figure 7 shows a cross-sectional view of a conductor of this bar.
  • a strand heating device is used in a steel installation upstream of a rolling mill.
  • a flat product consisting of a thick steel sheet 1 circulates on transport rollers 2 in a direction perpendicular to the plane of the sheet and represented by the end of an arrow V.
  • This magnetic circuit is articulated around an axis 9 to allow, using a device 10, to temporarily increase the opening of the air gap 3 when the sheet 1 has a protruding defect which could come into contact with and damage one end of the magnetic circuit.
  • the coils 7 and 8 are connected in series with each other and in parallel with a capacitive assembly 11 between the terminals of a generator 12.
  • the latter supplies an alternating voltage at a working frequency of 250 Hz.
  • the resonant circuit formed by the coils 7 and 8 and the capacitive assembly 11 is tuned to this frequency.
  • each tube T has a external surface of which at least part constitutes a thermal contact surface 28 extending over the length of this tube. It consists of a material having sufficient electrical resistivity, taking into account its transverse dimensions, to limit the currents induced in this material at the working frequency.
  • a plurality of the current transport strands B1 ... B12 extend over the length of the tube T. They are made of an electrically conductive material having an electrical resistivity lower than that of the material of this tube. Each of them has transverse dimensions smaller than those of this tube and chosen, taking into account this lower resistivity, so as to limit the currents induced in this strand at the working frequency. In addition, it rotates at least half a turn around this tube between the two electrical terminals so as to transpose the strands within the conductor.
  • Each of the strands such as B1 has a substantially flattened rectangular section and has two main faces 44, 46 which extend along a width of this strand which is parallel to the width of the tube T.
  • This strand also has two lateral faces 48, 50 which extend along a thickness of this strand which is parallel to the thickness of this tube and which is smaller than the width of this strand.
  • Some only of the strands constitute two so-called first layers of strands B1 to B3 and B7 to B9 which are applied respectively to the two main faces 28, 36 of the tube T.
  • Others of these strands constitute two second layers of strands B4 to B6 and B10 to B12 superimposed on these first two layers so as to make an indirect thermal contact between these two main faces of the tube and these two second layers through these first two layers, respectively.
  • Each of these first and second layers has the same number of strands between two and five inclusive. This number is preferably equal to three, in accordance with Figures 3 to 6.
  • Each group of conductors constitutes a bar 52 in which several conductors C1 to C5 succeed one another in an axial direction parallel to said coil axis A.
  • the coil 7 extends along said axial direction between two circular end zones each surrounding the coil axis A.
  • One of these zones comprises said electrical terminals 25, 26 and constitutes a high zone ZA.
  • the other constitutes a low zone ZB.
  • Two directions of movement are possible in said axial direction: a descending direction going from this high zone towards this low zone and a rising direction opposite to this descending direction.
  • the bar 52 starts from a first electrical terminal 20 by rotating in a direct direction 54 around the coil axis A and going down. It thus forms an external winding 56 having a first diameter.
  • a first conductor C1 is placed in this winding at the bottom of this bar.
  • a second conductor C2 is placed above this first conductor, and so on until a last conductor C5 placed at the top of this bar above a penultimate conductor C4.
  • This bar rotates and descends within this winding until the first conductor C1 reaches said lower zone ZB of the coil.
  • This first conductor then has a transposition deformation which is carried out in the transposition zone ZT1 of this conductor and which causes it to join an internal winding 58 formed by the same bar 52.
  • This winding has a second diameter smaller than said first diameter and the bar 52 rises within it while rotating around the coil axis A in said direct direction.
  • the second conductor C2 situated in the external winding reaches in turn the lower zone of the coil. It then has the same transposition deformation in a ZT2 transposition zone which is specific to it and which is angularly offset in said direct direction from the transposition zone of the first conductor. This deformation causes this second conductor to join the internal winding 58 while passing below the first conductor C1, and so on until the last conductor C5 reaches the low zone ZB of the coil.
  • This last conductor then has the same transposition deformation in a transposition zone ZT5 offset angularly in the same direction from a transposition zone ZT4 of the penultimate conductor C4. This transposition deformation causes the C5 conductor to join the internal winding while passing below this penultimate conductor.
  • first conductor C1 is placed in the internal winding 58 at the top of the bar 52, the second conductor C2 below this first conductor and so on until the last conductor C5 which is placed at the bottom of this closed off. The latter turns and rises within this winding up to the second electrical terminal 22 in the upper zone ZA of the coil.
  • the number of conductors of a bar is five and the thicknesses of the tube and of the strands of each of these conductors are oriented in the axial direction.
  • the twist zones ZV1 to ZV5 are placed next to the transposition zones ZT1 to ZT5 so as to form regular angular successions around the axis A.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
  • Resistance Heating (AREA)
  • Heat Treatment Of Articles (AREA)
  • Windings For Motors And Generators (AREA)
  • Magnetic Treatment Devices (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
EP91401572A 1990-06-15 1991-06-13 Induktionsheizspule Expired - Lifetime EP0462011B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9007507A FR2663490B1 (fr) 1990-06-15 1990-06-15 Bobine de chauffage inductif.
FR9007507 1990-06-15

Publications (2)

Publication Number Publication Date
EP0462011A1 true EP0462011A1 (de) 1991-12-18
EP0462011B1 EP0462011B1 (de) 1994-09-14

Family

ID=9397668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91401572A Expired - Lifetime EP0462011B1 (de) 1990-06-15 1991-06-13 Induktionsheizspule

Country Status (12)

Country Link
US (1) US5208433A (de)
EP (1) EP0462011B1 (de)
JP (1) JP2934313B2 (de)
KR (1) KR100222214B1 (de)
AT (1) ATE111672T1 (de)
AU (1) AU638147B2 (de)
CA (1) CA2044656C (de)
DE (1) DE69103969T2 (de)
ES (1) ES2060323T3 (de)
FR (1) FR2663490B1 (de)
WO (1) WO1991020168A1 (de)
ZA (1) ZA914570B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2693072A1 (fr) * 1992-06-24 1993-12-31 Celes Perfectionnements apportés aux bobines de système de chauffage par induction.
US10845438B2 (en) 2018-02-12 2020-11-24 Commissariat à l'énergie atomique et aux énergies alternatives Vector magnetometer with elliptical polarisation

Families Citing this family (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5239916A (en) * 1993-02-26 1993-08-31 Lungchiang Hu Watercool electromagnetic induction heating wok
CA2265297C (en) 1998-03-31 2002-10-29 Illinois Tool Works Inc. Method and apparatus for welding
US6229126B1 (en) 1998-05-05 2001-05-08 Illinois Tool Works Inc. Induction heating system with a flexible coil
WO2004016048A1 (en) * 2002-08-09 2004-02-19 Hak-Min Kim Electronic induction heater
KR100468410B1 (ko) * 2002-08-09 2005-01-29 김학민 전자유도 가열장치
EP1742511A4 (de) * 2004-04-23 2009-02-25 Japan Science & Tech Agency Spuleneinrichtung und magnetfeldgenerator
US10040143B2 (en) 2012-12-12 2018-08-07 Illinois Tool Works Inc. Dabbing pulsed welding system and method
US10906114B2 (en) 2012-12-21 2021-02-02 Illinois Tool Works Inc. System for arc welding with enhanced metal deposition
US9950383B2 (en) 2013-02-05 2018-04-24 Illinois Tool Works Inc. Welding wire preheating system and method
US10835983B2 (en) 2013-03-14 2020-11-17 Illinois Tool Works Inc. Electrode negative pulse welding system and method
US11045891B2 (en) 2013-06-13 2021-06-29 Illinois Tool Works Inc. Systems and methods for anomalous cathode event control
US10828728B2 (en) 2013-09-26 2020-11-10 Illinois Tool Works Inc. Hotwire deposition material processing system and method
US11154946B2 (en) 2014-06-30 2021-10-26 Illinois Tool Works Inc. Systems and methods for the control of welding parameters
US11198189B2 (en) 2014-09-17 2021-12-14 Illinois Tool Works Inc. Electrode negative pulse welding system and method
US11478870B2 (en) 2014-11-26 2022-10-25 Illinois Tool Works Inc. Dabbing pulsed welding system and method
US10189106B2 (en) 2014-12-11 2019-01-29 Illinois Tool Works Inc. Reduced energy welding system and method
US11370050B2 (en) 2015-03-31 2022-06-28 Illinois Tool Works Inc. Controlled short circuit welding system and method
US11285559B2 (en) 2015-11-30 2022-03-29 Illinois Tool Works Inc. Welding system and method for shielded welding wires
US10610946B2 (en) 2015-12-07 2020-04-07 Illinois Tool Works, Inc. Systems and methods for automated root pass welding
US12194579B2 (en) 2015-12-10 2025-01-14 Illinois Tool Works Inc. Systems, methods, and apparatus to preheat welding wire
US10675699B2 (en) 2015-12-10 2020-06-09 Illinois Tool Works Inc. Systems, methods, and apparatus to preheat welding wire
US10766092B2 (en) 2017-04-18 2020-09-08 Illinois Tool Works Inc. Systems, methods, and apparatus to provide preheat voltage feedback loss protection
US10870164B2 (en) 2017-05-16 2020-12-22 Illinois Tool Works Inc. Systems, methods, and apparatus to preheat welding wire
CA3066619C (en) 2017-06-09 2022-07-19 Illinois Tool Works Inc. Welding torch with a first contact tip to preheat welding wire and a second contact tip
WO2018227196A1 (en) 2017-06-09 2018-12-13 Illinois Tool Works Inc. Welding torch, with two contact tips and a plurality of liquid cooling assemblies for conducting currents to the contact tips
US11524354B2 (en) 2017-06-09 2022-12-13 Illinois Tool Works Inc. Systems, methods, and apparatus to control weld current in a preheating system
CA3066677C (en) 2017-06-09 2023-04-04 Illinois Tool Works Inc. Welding assembly for a welding torch, with two contact tips and a cooling body to cool and conduct current
EP3634682B1 (de) 2017-06-09 2023-08-23 Illinois Tool Works, Inc. Kontaktspitze mit schraubgewinden mit längsschlitzen für gasfluss, und einem kopf zur ermöglichung des lösens ; schweissbrenner mit einer solchen kontaktspitze
US11020813B2 (en) 2017-09-13 2021-06-01 Illinois Tool Works Inc. Systems, methods, and apparatus to reduce cast in a welding wire
EP3843933B1 (de) 2018-08-31 2026-01-14 Illinois Tool Works, Inc. Unterpulver-lichtbogenschweisssystem und unterpulver-lichtbogenschweissbrenner zur resistiven vorwärmung eines elektrodendrahtes
US11014185B2 (en) 2018-09-27 2021-05-25 Illinois Tool Works Inc. Systems, methods, and apparatus for control of wire preheating in welding-type systems
US11897062B2 (en) 2018-12-19 2024-02-13 Illinois Tool Works Inc. Systems, methods, and apparatus to preheat welding wire
US12583048B2 (en) 2019-03-29 2026-03-24 Illinois Tool Works Inc. Methods and apparatus to convert welding-type power to welding-type power and resistive preheating power
US12103121B2 (en) 2019-04-30 2024-10-01 Illinois Tool Works Inc. Methods and apparatus to control welding power and preheating power
US11772182B2 (en) 2019-12-20 2023-10-03 Illinois Tool Works Inc. Systems and methods for gas control during welding wire pretreatments
CN116741506A (zh) * 2022-03-01 2023-09-12 台达电子工业股份有限公司 压合线和磁性装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1150187A (fr) * 1955-05-18 1958-01-08 Asea Ab Dispositif pour le refroidissement d'enroulements électriques
FR1371223A (fr) * 1963-05-21 1964-09-04 Westinghouse Electric Corp Enroulements pour appareil électrique à induction
DE2347592A1 (de) * 1972-10-05 1974-04-18 Asea Ab Fluessigkeitsgekuehlte transformatorwicklung
US4176237A (en) * 1977-02-01 1979-11-27 Ateliers De Constructions Electriques De Charleroi (Acec) Four a induction
FR2555353A1 (fr) * 1983-11-21 1985-05-24 Cem Comp Electro Mec Electro-aimant a courant variable, notamment pour chauffage inductif

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US1986353A (en) * 1931-09-21 1935-01-01 Ajax Electrothermic Corp Induction furnace method and apparatus
US2249909A (en) * 1939-05-10 1941-07-22 Pisarev David End heating device
US4072873A (en) * 1975-07-09 1978-02-07 Westinghouse Electric Corp. Biaxial compression phase lead connector
US4277768A (en) * 1978-11-24 1981-07-07 General Dynamics Corporation Superconducting magnetic coil
FR2566986B1 (fr) * 1984-06-28 1986-09-19 Electricite De France Dispositif a induction electromagnetique pour le chauffage d'elements metalliques
SE460942B (sv) * 1985-08-22 1989-12-04 Tetra Pak Ab Uppvaermningsanordning foer foerpackningsbehaallare innehaallande vaetskeformigt fyllgods
CA1266094A (en) * 1986-01-17 1990-02-20 Patrick Earl Burke Induction heating and melting systems having improved induction coils
FR2630612B1 (fr) * 1988-04-26 1996-05-24 Siderurgie Fse Inst Rech Dispositif de protection des poles d'inducteurs et inducteur pourvu de ce dispositif
US4864266A (en) * 1988-04-29 1989-09-05 Electric Power Research Institute, Inc. High-voltage winding for core-form power transformers
US4859823A (en) * 1988-09-16 1989-08-22 Ajax Magnethermic Corporation Electric induction heater

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1150187A (fr) * 1955-05-18 1958-01-08 Asea Ab Dispositif pour le refroidissement d'enroulements électriques
FR1371223A (fr) * 1963-05-21 1964-09-04 Westinghouse Electric Corp Enroulements pour appareil électrique à induction
DE2347592A1 (de) * 1972-10-05 1974-04-18 Asea Ab Fluessigkeitsgekuehlte transformatorwicklung
US4176237A (en) * 1977-02-01 1979-11-27 Ateliers De Constructions Electriques De Charleroi (Acec) Four a induction
FR2555353A1 (fr) * 1983-11-21 1985-05-24 Cem Comp Electro Mec Electro-aimant a courant variable, notamment pour chauffage inductif

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2693072A1 (fr) * 1992-06-24 1993-12-31 Celes Perfectionnements apportés aux bobines de système de chauffage par induction.
EP0577468A1 (de) * 1992-06-24 1994-01-05 Société CELES Verbesserungen bei Spulen für Induktionsheizsysteme
US5430274A (en) * 1992-06-24 1995-07-04 Celes Improvements made to the cooling of coils of an induction heating system
US10845438B2 (en) 2018-02-12 2020-11-24 Commissariat à l'énergie atomique et aux énergies alternatives Vector magnetometer with elliptical polarisation

Also Published As

Publication number Publication date
ZA914570B (en) 1992-03-25
US5208433A (en) 1993-05-04
AU8083191A (en) 1992-01-07
FR2663490A1 (fr) 1991-12-20
JPH05500729A (ja) 1993-02-12
KR927002594A (ko) 1992-09-04
EP0462011B1 (de) 1994-09-14
FR2663490B1 (fr) 1992-09-11
ES2060323T3 (es) 1994-11-16
KR100222214B1 (ko) 1999-10-01
JP2934313B2 (ja) 1999-08-16
WO1991020168A1 (fr) 1991-12-26
CA2044656C (fr) 2001-08-21
DE69103969T2 (de) 1995-01-19
CA2044656A1 (fr) 1991-12-16
AU638147B2 (en) 1993-06-17
ATE111672T1 (de) 1994-09-15
DE69103969D1 (de) 1994-10-20

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