EP0070232B1 - Procédé et dispositif de chauffage homogène par induction électromagnétique à flux transversal de produits plats, conducteurs et amagnétiques - Google Patents

Procédé et dispositif de chauffage homogène par induction électromagnétique à flux transversal de produits plats, conducteurs et amagnétiques Download PDF

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Publication number
EP0070232B1
EP0070232B1 EP82401267A EP82401267A EP0070232B1 EP 0070232 B1 EP0070232 B1 EP 0070232B1 EP 82401267 A EP82401267 A EP 82401267A EP 82401267 A EP82401267 A EP 82401267A EP 0070232 B1 EP0070232 B1 EP 0070232B1
Authority
EP
European Patent Office
Prior art keywords
product
current
loops
heated
poles
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.)
Expired
Application number
EP82401267A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0070232A1 (fr
Inventor
Roger Travers
Jean-Paul Camus
Jean-Claude Bronner
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
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 Alstom SA filed Critical Alstom SA
Publication of EP0070232A1 publication Critical patent/EP0070232A1/fr
Application granted granted Critical
Publication of EP0070232B1 publication Critical patent/EP0070232B1/fr
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
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like
    • 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
    • H05B2213/00—Aspects relating both to resistive heating and to induction heating, covered by H05B3/00 and H05B6/00
    • H05B2213/03—Heating plates made out of a matrix of heating elements that can define heating areas adapted to cookware randomly placed on the heating plate

Definitions

  • the present invention relates to a method and a device for homogeneously heating, by transverse electromagnetic flux, thin non-magnetic conductive products of variable dimensions.
  • Document US-A-4 122 321 discloses a device for heating flat products using elongated magnetic poles.
  • the products to be heated being thick and long sheets, it is difficult or even impossible to ensure uniformity of heating with this device, especially along the edges of the product and when the dimensions of the product change.
  • Document FR-A-2 334 755 also discloses a method of heating a strip of infinite length during its running. The installation allowing the implementation of this process uses a linear motor.
  • the main object of the invention is to homogeneously heat a flat product when stopped, having two finite dimensions whatever these dimensions, for example in the context of a range of sheet metal manufacturing.
  • the process according to the invention consists in the generation, in the product, of currents (m) closing inside the meshes, the dimensions and the shapes of these current meshes resulting from spatial variations of the alternating magnetic field at which the product is subjected, the intensities of the currents in each mesh being such that the average value of the power density dissipated in each mesh is the same throughout the product.
  • the borders are, in general, not compatible with a given spatial distribution of the magnetic field, the dimensions of the treated products being variable or the expansion due to heating causing a significant variation of the latter.
  • the elementary meshes generated are not always those which exist in the case of an infinite product.
  • the average power density dissipated in one of these border meshes is different from that which would be dissipated for an infinite product. Certain meshes close to the border meshes can be disturbed.
  • a mesh of local border heterogeneity constituted by one or more juxtaposed elementary meshes is defined.
  • the dissipated power is adjusted by adjusting the intensity of the current loops (b) facing this mesh of local heterogeneity then defined.
  • each mesh of local heterogeneity of heating is identified with an elementary mesh.
  • Inductor current loops not facing the product are turned off.
  • the heating device consists of two identical horizontal inductors (A1 and A2) facing each other, arranged on either side of the product (F) to be heated (FIG. 1).
  • Each of the inductors is made up of identical square conductive windings (1), regularly arranged in an identical polar pitch in two orthogonal directions. In each of these directions, at each instant, the current loops (b) thus formed constitute a succession of alternating North and South magnetic poles ( Figures 2 and 3).
  • the magnetic fluxes are closed, allowing the effectiveness of the device to be reinforced, is ensured by a magnetic circuit (2), possibly ment in puff pastry. This closure can be carried out in one or both of the directions mentioned above, as the case may be. Closure in one - direction allows a simpler adjustment of the variation of the field profile in the orthogonal direction, the interactions between poles of two lines parallel to the direction of closure being weaker (figure 4).
  • the size of the pole is determined as a function of the maximum power density of the heating to be obtained, of the thermal conductivity of the product and of the maximum admissible temperature difference in the product during heating.
  • the temperature differences in the product can however be reduced, at the end of heating, by a reduction in the power density to which they are, at first order, proportional.
  • the variation in the magnetic field described above also achieves stable maintenance of the product between the inductors.
  • the position of the product relative to the inductors is known, for example from its entry position and from the movements made.
  • a computer From the position of the product (B figure 5), in particular that of its border compared to the poles of the inductor, and the characteristics of the product (F), a computer (E) elaborates the values of the intensities having to travel poles to obtain homogeneous heating. These intensities are substantially equal over most of the product; they are only different for the poles close to the product border. In the case of products much longer than wide, the production can be simplified by adjusting the intensities only by rows of poles parallel to the large width, the relative variations in intensity concerning only two or three rows on each side of the product. .
  • a device (G) regulates, from a source (S) whose frequency can be variable, the intensities in each pole or group of poles.
  • the desired rise in temperature can be obtained from a temperature setpoint (C) and a temperature measurement (D) of the product which is compared and which constitutes an input to the computer (E).
  • a function generator works out the average temperature function of the product with respect to time, the computer (E) then compares this temperature setpoint (C) to the calculated temperature, by integrating the heating already carried out to deliver the intensity setpoints allowing to respect the desired function.
  • a complement consists in comparing the calculated temperature to a real temperature measurement of the product and therefore to carry out a control, therefore to avoid slow drifts, or to carry out a self-adaptation of the mathematical model employed by the calculator.
  • the processed products are rectangular.
  • the length and width of the product are inputs to the main computer.
  • the main axis of the product being parallel to the heating device, the knowledge of the position of one of the points of the product, for example the center, relative to the heating device makes it possible to completely determine the position of the product (in particularly that of its borders) with respect to the inductor.
  • the product on arrival, the product is arranged symmetrically with respect to two known perpendicular axes.
  • the product is displaced by successively extinguishing rows of adjacent poles, therefore step by step, by a distance equal to one pole step.
  • a counter is incremented at each extinction and therefore gives the position of the center at all times.
  • the rise in temperature of the product is, for example, known by integration as a function of time, of the density power quotient (determined by the computer) mass heat at the considered temperature. It can be checked by measuring the temperature of the product using a claw thermometer.
  • a computer From the position of the product (B figure 5), in particular that of its border compared to the poles of the inductor, and the characteristics of the product (F), a computer (E) elaborates the values of the intensities having to travel poles to get. homogeneity of heating. These intensities are substantially equal over most of the product; they are only different for the poles close to the product border. In the case of products much longer than wide, the production can be simplified by adjusting the intensities only by rows of poles parallel to the large width, the relative variations in intensity concerning only two or three rows on each side of the product. .
  • a device (G) regulates, from a source (S) whose frequency can be variable, the intensities in each pole or group of poles.
  • the desired rise in temperature can be obtained from a temperature setpoint (C) and a temperature measurement (D) of the product which is compared and which constitutes an input to the computer (E).
  • a function generator works out the average temperature function of the product with respect to time, the computer (E) then compares this temperature setpoint (C) to the calculated temperature, by integrating the heating already carried out to deliver the setpoints intensity to meet the desired function.
  • a complement consists in comparing the calculated temperature to a real temperature measurement of the product and therefore to carry out a control, therefore to avoid slow drifts, or to carry out a self-adaptation of the mathematical model employed by the calculator.
  • the processed products are rectangular.
  • the length and width of the product are inputs to the main computer.
  • the main axis of the product being parallel to the heating device, the knowledge of the position of one of the points of the product, for example the center, relative to the heating device makes it possible to completely determine the position of the product (in particularly that of its borders) with respect to the inductor.
  • the product on arrival, the product is arranged symmetrically with respect to two known perpendicular axes.
  • the product is displaced by successively extinguishing rows of adjacent poles, therefore step by step, by a distance equal to one pole step.
  • a counter is incremented at each extinction and therefore gives the position of the center at all times.
  • the rise in temperature of the product is, for example, known by integration as a function of time, of the density power quotient (determined by the computer) mass heat at the considered temperature. It can be checked by measuring the temperature of the product using a claw thermometer.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
EP82401267A 1981-07-10 1982-07-06 Procédé et dispositif de chauffage homogène par induction électromagnétique à flux transversal de produits plats, conducteurs et amagnétiques Expired EP0070232B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8113689A FR2509562A1 (fr) 1981-07-10 1981-07-10 Procede et dispositif de chauffage homogene par induction electromagnetique a flux transversal de produits plats, conducteurs et amagnetiques
FR8113689 1981-07-10

Publications (2)

Publication Number Publication Date
EP0070232A1 EP0070232A1 (fr) 1983-01-19
EP0070232B1 true EP0070232B1 (fr) 1986-09-10

Family

ID=9260458

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401267A Expired EP0070232B1 (fr) 1981-07-10 1982-07-06 Procédé et dispositif de chauffage homogène par induction électromagnétique à flux transversal de produits plats, conducteurs et amagnétiques

Country Status (5)

Country Link
US (1) US4484048A (enrdf_load_stackoverflow)
EP (1) EP0070232B1 (enrdf_load_stackoverflow)
JP (1) JPS5851493A (enrdf_load_stackoverflow)
DE (1) DE3273178D1 (enrdf_load_stackoverflow)
FR (1) FR2509562A1 (enrdf_load_stackoverflow)

Families Citing this family (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2122058B (en) * 1982-05-28 1985-10-23 Glaverbel Method and apparatus for bonding glazing panels
FR2558941B1 (fr) * 1984-01-26 1986-05-02 Cem Comp Electro Mec Dispositif de chauffage de produits plats au defile par induction electromagnetique
FR2573947B1 (fr) * 1984-11-29 1987-01-02 Cem Comp Electro Mec Dispositif de chauffage de produits plats au defile par induction electromagnetique selon un maillage carre
JPS62150371A (ja) * 1985-12-25 1987-07-04 Alps Electric Co Ltd 熱圧力定着装置
JPH07101633B2 (ja) * 1987-09-28 1995-11-01 株式会社明電舎 平板の誘導加熱装置
FR2660743B1 (fr) * 1990-04-04 1995-08-04 Sundgau Sarl Atel Const Elect Procede et dispositif pour chauffer des pieces metalliques dans un four a induction.
GB2262420B (en) * 1991-12-03 1995-02-08 Electricity Ass Tech Induction heating apparatus
US5308946A (en) * 1992-02-06 1994-05-03 Mohr Glenn R Induction heating apparatus and method for heating metal strips and slabs
FR2693071B1 (fr) * 1992-06-24 2000-03-31 Celes Dispositif de chauffage inductif homogene de produits plats metalliques au defile.
DE19943976A1 (de) 1999-09-14 2001-03-15 Emitec Emissionstechnologie Verfahren und Vorrichtung zur stirnseitigen fügetechnischen Verbindung einer Trägermatrix eines Wabenkörpers
FR2808163B1 (fr) * 2000-04-19 2002-11-08 Celes Dispositif de chauffage par induction a flux transverse a circuit magnetique de largeur variable
US6570141B2 (en) * 2001-03-26 2003-05-27 Nicholas V. Ross Transverse flux induction heating of conductive strip
EP1496129A4 (en) * 2002-04-08 2006-02-22 Jfe Steel Corp THERMAL PROCESSING DEVICE AND METHOD, SUPPORT FOR RECORDING THERMAL PROCESSING PROGRAM, AND STEEL PRODUCT
US7857919B2 (en) * 2003-06-16 2010-12-28 Jfe Steel Corporation Process for producing steel product and production facility therefor
CN100351402C (zh) * 2003-08-05 2007-11-28 杰富意钢铁株式会社 钢材的制造方法及其制造设备
ES2272879T5 (es) † 2003-12-08 2011-03-18 Whirlpool Corporation Un dispositivo para determinar la posición de utensilios de cocina sobre una placa de cocina.
JP2007077424A (ja) * 2005-09-12 2007-03-29 Ntn Corp 高周波焼戻方法、高周波焼戻設備および高周波焼戻製品
US10231289B2 (en) * 2013-11-07 2019-03-12 Illinois Tool Works Inc. Large scale metal forming
CN103996481A (zh) * 2014-05-22 2014-08-20 西北工业大学 一种大面积均匀竖直可变耦合运动磁场的生成方法
EP4243571A3 (en) * 2016-03-30 2023-11-15 Nippon Steel Corporation Induction heating device and induction heating method
CN109219985B (zh) * 2016-04-18 2021-12-03 阿尔卑斯南部欧洲有限责任公司 感应加热器和分配器
US10942257B2 (en) 2016-12-31 2021-03-09 Innovusion Ireland Limited 2D scanning high precision LiDAR using combination of rotating concave mirror and beam steering devices
US11493601B2 (en) 2017-12-22 2022-11-08 Innovusion, Inc. High density LIDAR scanning
CN119247372A (zh) 2018-06-15 2025-01-03 图达通智能美国有限公司 用于聚焦感兴趣的范围的lidar系统和方法
US10939600B2 (en) 2018-11-28 2021-03-02 International Business Machines Corporation Flux residue detection

Citations (1)

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Publication number Priority date Publication date Assignee Title
US4054770A (en) * 1975-03-10 1977-10-18 The Electricity Council Induction heating of strip and other elongate metal workpieces

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CA909873A (en) * 1972-09-12 V. Sorokin Viktor Method of and device for induction heating of flat bodies
DE903977C (de) * 1940-01-21 1954-02-11 Siemens Ag Wirbelstromheizeinrichtung
DE921401C (de) * 1941-08-23 1954-12-20 Siemens Ag Induktionseinrichtung zum Gluehen und Haerten von Panzerplatten
US2448009A (en) * 1944-02-05 1948-08-31 Westinghouse Electric Corp Inductive heating of longitudinally moving metal strip
US2556223A (en) * 1947-05-28 1951-06-12 Westinghouse Electric Corp Induction heating of flat metal by transverse flux
FR1202900A (fr) * 1957-03-05 1960-01-14 Penn Induction Corp Procédé et appareil pour le chauffage par induction de bandes de tôle
US2902572A (en) * 1957-03-05 1959-09-01 Penn Induction Company Induction heating of metal strip
NL243545A (enrdf_load_stackoverflow) * 1958-09-19 1900-01-01
CH416879A (de) * 1963-04-01 1966-07-15 Baermann Max Ofen zur Erwärmung von metallischen Teilen
US3444346A (en) * 1966-12-19 1969-05-13 Texas Instruments Inc Inductive heating of strip material
US3781506A (en) * 1972-07-28 1973-12-25 Gen Electric Non-contacting temperature measurement of inductively heated utensil and other objects
US4321444A (en) * 1975-03-04 1982-03-23 Davies Evan J Induction heating apparatus
DE2556057C2 (de) * 1975-12-12 1982-04-01 Sundwiger Eisenhütte Maschinenfabrik Grah & Co, 5870 Hemer Verfahren und Vorrichtung zum Erwärmen von Metallbändern, insbesondere Nichteisen-Metallbändern
JPS5316939A (en) * 1976-07-30 1978-02-16 Nippon Steel Corp Inducton heating method
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

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US4054770A (en) * 1975-03-10 1977-10-18 The Electricity Council Induction heating of strip and other elongate metal workpieces

Also Published As

Publication number Publication date
FR2509562A1 (fr) 1983-01-14
EP0070232A1 (fr) 1983-01-19
DE3273178D1 (en) 1986-10-16
US4484048A (en) 1984-11-20
FR2509562B1 (enrdf_load_stackoverflow) 1984-06-29
JPS5851493A (ja) 1983-03-26
JPS6256632B2 (enrdf_load_stackoverflow) 1987-11-26

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