EP0765591A1 - Process and device for inductive cross-field heating of flat metallic goods - Google Patents

Process and device for inductive cross-field heating of flat metallic goods

Info

Publication number
EP0765591A1
EP0765591A1 EP95921684A EP95921684A EP0765591A1 EP 0765591 A1 EP0765591 A1 EP 0765591A1 EP 95921684 A EP95921684 A EP 95921684A EP 95921684 A EP95921684 A EP 95921684A EP 0765591 A1 EP0765591 A1 EP 0765591A1
Authority
EP
European Patent Office
Prior art keywords
conductor
inductors
inductor
systems
goods
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
EP95921684A
Other languages
German (de)
French (fr)
Other versions
EP0765591B1 (en
Inventor
Dieter Schluckebier
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.)
Otto Junker GmbH
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Otto Junker GmbH
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Filing date
Publication date
Application filed by Otto Junker GmbH filed Critical Otto Junker GmbH
Publication of EP0765591A1 publication Critical patent/EP0765591A1/en
Application granted granted Critical
Publication of EP0765591B1 publication Critical patent/EP0765591B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B6/36—Coil arrangements
    • H05B6/362—Coil arrangements with flat coil conductors

Definitions

  • the invention relates to a device for inductive cross-field heating of flat metallic material, e.g. of strips and plates, with at least one pair of inductors, which forms an intermediate space for the material to pass through, and the inductors of which each have an iron core which has grooves which run in the transport direction and each have a current conductor, the grooves and conductors of the inductors of an inductor pair in each case
  • the mirror image is the same and a method for using the device.
  • a device for inductive heating with two conductor systems per inductor is known from PCT / GB 92/02212.
  • one conductor system across the width of the metallic material produces an approximately sinusoidal course of the induced current density, the period corresponding to the width of the material.
  • a number of adjacent conductors of this conductor system have the current flowing through them in the same direction.
  • the width of the Pole is determined by the desired correspondence of period length and width of the good by the latter. This first conductor system thus produces an approximately sinusoidal profile of the temperature in the material to be heated.
  • the second conductor system now also produces a sinusoidal course of the induced current density across the width of the material to be heated, albeit albeit offset by about ⁇ / 4 compared to the first conductor system, so that precisely the points of the metallic material are heated most strongly by this second conductor system that were previously minimally warmed by the first conductor system.
  • the two conductor systems can be switched sequentially. Working alone in a conductor system would result in a very different temperature distribution and could not be accepted.
  • this object is achieved in that the conductors of an inductor each have two switchable conductor systems, each conductor system having conductor sections running in the transport direction, the averaging lines of which are symmetrical to one
  • the inductor-centered axis running parallel to the direction of transport is arranged so that the individual poles of the conductor systems can have a maximum of two lines. t ⁇ rn are formed and that one pole of the other conductor system is arranged between the poles of the one conductor system.
  • the device is operated in such a way that the two conductor systems are clocked and connected to one another with a time delay.
  • the poles can be made narrow, so that the temperature distribution across the width of the metallic material is already very uniform.
  • the poles of the second conductor system now lie between the poles of the first conductor system and, with a time delay, produce a maximum density of the induced eddy currents precisely at those points where the first conductor system generated a minimum density. This leads to a smoothing of the temperature.
  • the two conductor systems are switched one after the other in time, since if current were applied simultaneously, the efficiency of the inductor would be reduced due to the then short distances between two adjacent conductors through which current flows.
  • the sequential connection of the two conductor systems thus causes the density of the inductor lines to be doubled with virtually no loss in the efficiency of the inductor.
  • the inductor is constructed essentially symmetrically with respect to an inductor-centered axis pointing in the transport direction, the conditions at the edges of the goods to be heated can be kept the same on both sides even with varying widths of the goods to be heated. If the conductors are not rectilinear, the required symmetry relates to averaging straight lines of the conductor sections which, viewed in the transport direction, run from one end of the inductor to the other.
  • the device according to the invention can also be designed such that the individual poles of one conductor system are each formed by two conductors and the poles of the other conductor system are each formed by one conductor.
  • the device according to the invention can be designed such that the grooves and conductors of the inductors run in a straight line, in a zigzag or in a wave shape.
  • the device according to the invention can be designed such that the cores of inductors are divided into core sections in the transport direction.
  • the device according to the invention can also be designed such that the inductors and the material to be heated can be aligned relative to one another in the inductor center.
  • the method according to the invention can also be carried out in such a way that the two conductor systems are connected in succession to the same power source.
  • the method according to the invention can also be carried out in such a way that the two conductor systems are successively connected to separate current sources.
  • the method according to the invention can also be carried out in such a way that the two conductor systems are connected to the respective current source over unequal periods of time.
  • the method according to the invention can be carried out in such a way that the two conductor systems are connected to the respective current source at intervals.
  • I ⁇ shows 1: a schematic representation of the top view of an inductor according to the invention, both conductor systems each having one conductor per pole, and
  • an inductor 1 and the material 2, 3 to be heated are shown in broken lines in two different widths.
  • the inductor 1 has a core which is divided into four core sections 4, 5, 6, 7. These core sections 4, 5, 6, 7 have grooves 8 which are inclined in alternating alignment with the direction of transport of the metallic goods 2, 3 indicated by the arrow. In the embodiment, they are zigzag. Conductors 9, 10 of the inductor 1 are arranged in these grooves 8 and consequently likewise run in a zigzag shape.
  • the conductor 9 has its own power connections 11, 12 and conductor 10 also has its own power connections 13, 14, so that two mutually independent conductor systems are formed.
  • the second line system with the conductor 10 is therefore used, the conductor sections of which, as can be seen in FIG. 1 by way of example on the conductor sections 17, 18, run between the poles of the other conductor 9. Due to this geometrical arrangement of the conductors 9, 10, the maximum heating of the metallic material 2, 3 by the one conductor 9 occurs precisely in the areas of the metallic material 2, 3 in which the other conductor 10 has generated a temperature minimum.
  • the two conductor systems with their conductors 9, 10 can be switched separately from one another, they can each be supplied with different powers on average over time. This can e.g. happen by the fact that the duration of the
  • Such an averaging line 19 is shown in FIG. 1 for the conductor section 20 of the conductor 9.
  • This symmetry requirement which relates not only to the edge region of the inductor 1, is particularly advantageous if the inductor 1, as shown in FIG. 1, is used to heat metallic material 2, 3 of different widths.
  • FIG. 2 shows an inductor 21, the core of which, as in the previously described inductor 1, is divided into four sections 22, 23, 24, 25, and in which also grooves 26 are inclined to the direction of transport indicated by the arrow warming good 27 run.
  • a conductor system, that of the conductor 29 has two conductor sections per pole, ie two directly adjacent conductor sections, the current direction of which is identical.
  • the poles of the conductor 28, which consist of a single conductor section, run between the poles of this conductor 29.

Abstract

PCT No. PCT/DE95/00757 Sec. 371 Date Feb. 13, 1997 Sec. 102(e) Date Feb. 13, 1997 PCT Filed Jun. 13, 1995 PCT Pub. No. WO95/35013 PCT Pub. Date Dec. 21, 1995A device for inductive cross-field heating of flat metallic goods has at least one pair of inductors having each one iron core provided with a groove for receiving a lead that extends in the transport direction. The grooves and leads of both inductors of a pair of inductors are mirror symmetrical and the leads of each inductor form two independently switchable lead systems. Each lead system has sections that extend substantially in the transport direction of the metallic goods and whose center lines extend symmetrically to a central axis of the inductor parallel to the transport direction. The individual poles of the lead systems consist of maximum two leads. Each pole of a lead system is arranged between the poles of the other lead system. A uniform temperature distribution in the goods to be heated is achieved by synchronizing the offsetting in time the moments when both lead systems are switched. The substantially symmetrical design of the inductor causes similar conditions to prevail at both edges of the goods even when the goods have various widths. By reducing the power applied by the lead system, which acts essentially on both edges of the metallic goods, the edges may thus be prevented from overheating.

Description

VORRICHTUNG UND VERFAHREN ZUR INDUKTIVEN QUERFELDERWÄRMUNG VON FLACHEM METALLISCHEM GUT DEVICE AND METHOD FOR INDUCTING CROSS-FIELD HEATING OF FLAT METALLIC GOODS
Beschreibungdescription
Die Erfindung betrifft eine Vorrichtung zur induktiven Querfelderwärmung von flachem metallischem Gut, z.B. von Bändern und Platten, mit mindestens einem Induktorpaar, das einen Zwischenraum zum Hindurchtreten des Gutes bildet und dessen Induktoren jeweils einen Eisenkern haben, der in Transportrichtung verlaufende, jeweils einen Stromleiter aufnehmende Nuten hat, wobei die Nuten und Leiter der In- duktoren eines Induktorpaares jeweils spiegelbildlich gleich verlaufen und ein Verfahren zur Anwendung der Vor¬ richtung.The invention relates to a device for inductive cross-field heating of flat metallic material, e.g. of strips and plates, with at least one pair of inductors, which forms an intermediate space for the material to pass through, and the inductors of which each have an iron core which has grooves which run in the transport direction and each have a current conductor, the grooves and conductors of the inductors of an inductor pair in each case The mirror image is the same and a method for using the device.
Aus der DE-OS 39 28 629 ist eine Vorrichtung zum induktiven Erwärmen von flachem metallischem Gut bekannt, bei der meh¬ rere für sich schaltbare Leiterschleifen vorgesehen sind, die jeweils zwei Leiterteile haben, wobei jeweils der rechte Leitertei I ebenso weit vom rechten Rand des Induk¬ tors entfernt ist wie der linke Leiterteil vom linken Rand des Induktors. Durch Zu- oder Abschalten dieser Leiter¬ schleifen kann die wirksame Breite des Induktors der Gut¬ breite angepaßt werden. Al le eingeschalteten Leiterschlei¬ fen sind gleichzeitig wirksam, ein Takten liegt nicht vor.From DE-OS 39 28 629 a device for inductive heating of flat metallic material is known, in which several switchable conductor loops are provided, each having two conductor parts, the right conductor part I being just as far from the right edge of the Like the left conductor part, the inductor is removed from the left edge of the inductor. By switching these conductor loops on or off, the effective width of the inductor can be adapted to the material width. All of the conductor loops that are switched on are effective at the same time, there is no clocking.
Aus der PCT/GB 92/02212 ist eine Vorrichtung zur induktiven Erwärmung mit zwei Leitersystemen pro Induktor bekannt. Hierbei erzeugt das eine Leitersystem über die Breite des metallischen Gutes betrachtet einen in etwa sinusförmigen Verlauf der induzierten Stromdichte, wobei die Periode der Breite des Gutes entspricht. Zur Erzielung des gewünschten Verlaufs und damit zur Erreichung der zugehörigen Polbreite ist eine Anzahl von benachbarten Leitern dieses Leitersy¬ stems gleichsinnig vom Strom durchflössen. Die Breite der Pole wird durch die gewünschte Übereinstimmung von Peri¬ odenlänge und Breite des Gutes durch letztere bestimmt ist. Dieses erste Leitersystem erzeugt somit einen in etwa si- , nusförmigen Verlauf der Temperatur im zu erwärmenden Gut. Das zweite Leitersystem erzeugt nun ebenfalls über die Breite des zu erwärmenden Gutes einen sinusförmigen Verlauf der induzierten Stromdichte, al lerdings etwa um π/4 gegen¬ über dem ersten Leitersystem versetzt, so daß durch dieses zweite Leitersystem gerade die Stellen des metallischen Gutes am stärksten erwärmt werden, die zuvor vom ersten Leitersystem minimal erwärmt wurden. Die beiden Leitersy¬ steme sind dazu zeitlich nacheinander schaltbar. Das Arbei¬ ten al lein eines Leitersystem würde dabei eine stark unter¬ schiedliche Temperaturverteilung zur Folge haben und nicht akzeptiert werden können.A device for inductive heating with two conductor systems per inductor is known from PCT / GB 92/02212. When viewed here, one conductor system across the width of the metallic material produces an approximately sinusoidal course of the induced current density, the period corresponding to the width of the material. In order to achieve the desired course and thus to achieve the associated pole width, a number of adjacent conductors of this conductor system have the current flowing through them in the same direction. The width of the Pole is determined by the desired correspondence of period length and width of the good by the latter. This first conductor system thus produces an approximately sinusoidal profile of the temperature in the material to be heated. The second conductor system now also produces a sinusoidal course of the induced current density across the width of the material to be heated, albeit albeit offset by about π / 4 compared to the first conductor system, so that precisely the points of the metallic material are heated most strongly by this second conductor system that were previously minimally warmed by the first conductor system. For this purpose, the two conductor systems can be switched sequentially. Working alone in a conductor system would result in a very different temperature distribution and could not be accepted.
Der Nachtei I dieser Anordnung besteht darin, daß die durch den Induktor vorgegebene sinusförmige Verteilung der indu¬ zierten Stromdichte nur zu einer bestimmten Breite des zu erwärmenden metallischen Gutes paßt. Desweiteren müssen bei dieser Vorrichtung aufwendige Maßnahmen zur Vermeidung ei¬ ner Randüberhitzung im metallischen Gut betrieben werden.The disadvantage of this arrangement is that the sinusoidal distribution of the induced current density given by the inductor only fits to a certain width of the metallic material to be heated. Furthermore, with this device, complex measures have to be taken to avoid overheating in the metallic material.
Es ist nun Aufgabe der vorliegenden Erfindung, eine Vor- richtung der eingangs erwähnten Art und ein Verfahren zum Betreiben dieser Vorrichtung anzugeben, womit im zu erwär¬ menden metallischen Gut ein möglichst gleichmäßiger Tempe¬ raturverlauf erreicht und eine Randüberhitzung vermieden wird.It is an object of the present invention to provide a device of the type mentioned at the outset and a method for operating this device, by means of which the temperature profile in the metallic material to be heated is as uniform as possible and overheating is avoided.
Bei einer Vorrichtung der eingangs erwähnten Art wird die Lösung dieser Aufgabe dadurch erreicht, daß die Leiter ei¬ nes Induktors jewei Is zwei für sich schaltbare Leitersy¬ steme bi Iden, wobei jedes Leitersystem in Transportrichtung verlaufende Leiterabschnitte besitzt, deren Mittelungsgera¬ den symmetrisch zu einer parallel zur Transportrichtung verlaufenden, induktormittigen Achse angeordnet sind, daß die einzelnen Pole der Leitersysteme maximal von zwei Lei- tβrn gebildet sind und daß zwischen den Polen des einen Leitersystems jeweils ein Pol des anderen Leitersystem an¬ geordnet ist.In a device of the type mentioned at the outset, this object is achieved in that the conductors of an inductor each have two switchable conductor systems, each conductor system having conductor sections running in the transport direction, the averaging lines of which are symmetrical to one The inductor-centered axis running parallel to the direction of transport is arranged so that the individual poles of the conductor systems can have a maximum of two lines. tβrn are formed and that one pole of the other conductor system is arranged between the poles of the one conductor system.
Erfindungsgemäß wird mit dieser Vorrichtung so verfahren, daß die beiden Leitersystem getaktet und zeitversetzt zu¬ einander geschaltet werden.According to the invention, the device is operated in such a way that the two conductor systems are clocked and connected to one another with a time delay.
Da maximal zwei Leiter einen Pol bilden, können die Pole schmal gestaltet werden, so daß schon dadurch die Tempera¬ turverteilung über die Breite des metallischen Gutes be¬ trachtet eine recht hohe Gleichmäßigkeit aufweist. Das zweite Leitersystem liegt mit seinen Polen nun zwischen den Polen des ersten Leitersystems und erzeugt zeitversetzt ge- rade an den Stellen eine maximale Dichte der induzierten Wirbelströme, an denen das erste Leitersystem eine minimale Dichte erzeugte. Somit kommt es zu einer Glättung des Tem- peraturverlau es. Die beiden Leitersysteme werden zeitlich nacheinander geschaltet, da bei gleichzeitiger Beaufschla- gung mit Strom aufgrund der dann geringen Abstände zwischen zwei benachbarten, gleichzeitig von Strom durchflossenen Leitern der Wirkungsgrad des Induktors verringert würde. Das Nacheinanderschalten der beiden Leitersysteme bewirkt also quasi ohne Verlust im Wirkungsgrad des Induktors eine Verdoppelung der Dichte der Induktor leitungen.Since a maximum of two conductors form a pole, the poles can be made narrow, so that the temperature distribution across the width of the metallic material is already very uniform. The poles of the second conductor system now lie between the poles of the first conductor system and, with a time delay, produce a maximum density of the induced eddy currents precisely at those points where the first conductor system generated a minimum density. This leads to a smoothing of the temperature. The two conductor systems are switched one after the other in time, since if current were applied simultaneously, the efficiency of the inductor would be reduced due to the then short distances between two adjacent conductors through which current flows. The sequential connection of the two conductor systems thus causes the density of the inductor lines to be doubled with virtually no loss in the efficiency of the inductor.
Da der Induktor zu einer in Transportrichtung weisenden in- duktormittigen Achse im wesentlichen symmetrisch aufgebaut ist, können auch bei variierenden Breiten des zu erwärmen- den Gutes die Bedingungen an den Rändern des zu erwärmenden Gutes auf beiden Seiten gleich gehalten werden. Die gefor¬ derte Symmetrie bezieht sich bei einem nicht geradlinigen Verlauf der Leiter auf Mittelungsgeraden der Leiterab¬ schnitte, die in Transportrichtung gesehen von einem zum anderen Ende des Induktors verlaufen.Since the inductor is constructed essentially symmetrically with respect to an inductor-centered axis pointing in the transport direction, the conditions at the edges of the goods to be heated can be kept the same on both sides even with varying widths of the goods to be heated. If the conductors are not rectilinear, the required symmetry relates to averaging straight lines of the conductor sections which, viewed in the transport direction, run from one end of the inductor to the other.
§§ aufgrund der Symmetrie die Verhältnisse an beiden Rän¬ dern des metallischen Gutes übereinstimmen, kann auf diese Ränder, z.B. zur Vermeidung von Randüberhitzungen, glei¬ chermaßen eingewirkt werden. Z.B. kann, da beide Leitersy¬ steme für sich schaltbar sind, speziell das Leitersystem, das gerade auf diese Randbereiche einwirkt im zeitlichen Mittel mit einer geringeren Leistung beaufschlagt werden.§§ Due to the symmetry, the conditions on both edges of the metallic good match, this can Edges, for example to avoid edge overheating, are equally acted on. For example, since both conductor systems can be switched on their own, the conductor system, which acts on these edge areas in particular, can be acted upon with a lower power on average over time.
Die erfindungsgemäße Vorrichtung kann auch so ausgebildet sein, daß die einzelnen Pole des einen Leitersystems je- wei Is von zwei Leitern und die Pole des anderen Leitersy- stems jeweils von einem Leiter gebildet sind.The device according to the invention can also be designed such that the individual poles of one conductor system are each formed by two conductors and the poles of the other conductor system are each formed by one conductor.
Hierdurch wird aufgrund der erhöhten Polbreite der Wir¬ kungsgrad des einen Leitersystems erhöht.As a result, the efficiency of one conductor system is increased due to the increased pole width.
Desweiteren kann die erfindungsgemäße Vorrichtung so ausge¬ bildet sein, daß die Nuten und Leiter der Induktoren gerad¬ linig, Zickzack- oder wellenförmig verlaufen.Furthermore, the device according to the invention can be designed such that the grooves and conductors of the inductors run in a straight line, in a zigzag or in a wave shape.
Weiterhin kann die erfindungsgemäße Vorrichtung so ausge- staltet sein, daß die Kerne von Induktoren in Transpor¬ trichtung in Kernabschnitte unterteilt sind.Furthermore, the device according to the invention can be designed such that the cores of inductors are divided into core sections in the transport direction.
Hierdurch erleichtert sich die Herstellung ausgedehnter In¬ duktoren besonders dann, wenn einzelne Induktorabschnitte einen zueinander unterschiedlichen Aufbau, z.B. im Verlauf der Nuten haben.This facilitates the manufacture of extensive inductors, particularly when individual inductor sections have a different structure, e.g. in the course of the grooves.
Schließlich kann die erfindungsgemäße Vorrichtung auch so ausgebi ldet sein, daß die Induktoren und das zu erwärmende Gut induktormittig relativ zueinander ausrichtbar sind.Finally, the device according to the invention can also be designed such that the inductors and the material to be heated can be aligned relative to one another in the inductor center.
Bei einer solchen Ausrichtung kann von einem Temperaturpro¬ fil des zu erwärmenden Gutes ausgegangen werden und an bei¬ den Rändern dieses Gutes eine gleiche Temperaturverteilung eingestellt werden. Hierdurch kann das metallische Gut stets so zum Induktor ausgerichtet werden, daß die Leiter¬ systeme symmetrisch zur Mitte des metallischen Gutes ver¬ laufen. Dies ist eine Voraussetzung für die gleichmäßige - 5 - Wärmebehandlung beider Ränder des metallischen Gutes.With such an alignment, a temperature profile of the material to be heated can be assumed and the same temperature distribution can be set at both edges of this material. As a result, the metallic good can always be aligned with the inductor in such a way that the conductor systems run symmetrically to the center of the metallic good. This is a requirement for even - 5 - Heat treatment of both edges of the metallic material.
Das erfindungsgemäße Verfahren kann auch so ausgeführt wer¬ den, daß die beiden Leitersysteme nacheinander an die selbe Stromquelle angeschlossen werden.The method according to the invention can also be carried out in such a way that the two conductor systems are connected in succession to the same power source.
Das erfindungsgemäße Verfahren kann aber auch so ausgeführt werden, daß die beiden Leitersysteme nacheinander an sepa¬ rate Stromquellen angeschlossen werden.However, the method according to the invention can also be carried out in such a way that the two conductor systems are successively connected to separate current sources.
Hierdurch ist es möglich, die verschiedenen Leitersysteme mit unterschiedlichen Frequenzen zu beaufschlagen. Somit könnte also zur Vermeidung von Randüberhitzungen dem Lei¬ tersystem, das stärker auf die Ränder des metallischen Gutes wirkt, bei veränderter Frequenz eine geringere Lei¬ stung zugeführt werden.This makes it possible to apply different frequencies to the different conductor systems. Thus, in order to avoid edge overheating, a lower power could be supplied to the conductor system, which acts more strongly on the edges of the metallic material, at a changed frequency.
Das erfindungsgemäße Verfahren kann weiterhin auch so aus¬ geführt werden, daß die beiden Leitersysteme über ungleiche Zeitdauern an die jeweilige Stromquelle angeschlossen wer¬ den.The method according to the invention can also be carried out in such a way that the two conductor systems are connected to the respective current source over unequal periods of time.
Hierdurch kann auch bei identischen Frequenzen im zeitli¬ chen Mittel gesehen den unterschiedlichen Leitersystemen eine unterschiedliche Leistung zugeführt werden. Dazu muß das Leitersystem mit geringerem Leistungsbedarf für kürzere Zei dauern an die Stromquel le angeschlossen werden als das andere Leitersystem.As a result, a different power can be supplied to the different conductor systems, even when the frequencies are identical on average over time. To do this, the conductor system with lower power requirements for shorter periods of time must be connected to the power source than the other conductor system.
Schließlich kann das erfindungsgemäße Verfahren so ausge¬ führt sein, daß die beiden Leitersysteme mit zeitlichem Ab¬ stand an die jeweilige Stromquel le angeschlossen werden.Finally, the method according to the invention can be carried out in such a way that the two conductor systems are connected to the respective current source at intervals.
Im folgenden werden Ausführungsformen der erfindungsgemäßen Vorrichtung anhand von Figuren erläutert.Embodiments of the device according to the invention are explained below with reference to figures.
I§ zeigt Fig. 1: in schematischer Darstellung die Aufsicht auf einen erfindungsgemäßen Induktor, wobei beide Leitersysteme jeweils einen Leiter pro Pol auf¬ weisen, undI§ shows 1: a schematic representation of the top view of an inductor according to the invention, both conductor systems each having one conductor per pole, and
Fig. 2: eine Darstellung gemäß Fig. 1, wobei ein Leitersystem zwei Leiter pro Pol und das andere Leitersystem einen Leiter pro Pol aufweist.2: a representation according to FIG. 1, wherein one conductor system has two conductors per pole and the other conductor system has one conductor per pole.
In Fig. 1 ist ein Induktor 1 und gestrichelt das zu erwär¬ mende Gut 2,3 in zwei verschiedenen Breiten dargestellt. Der Induktor 1 hat einen Kern, der in vier Kernabschnitte 4,5,6,7 aufgeteilt ist. Diese Kernabschnitte 4,5,6,7 haben Nuten 8, die in abwechselnder Ausrichtung zu der durch den Pfeil angedeuteten Transportrichtung des metallischen Gutes 2,3 geneigt sind. In der Ausführungsform verlaufen sie zickzackförmig. In diesen Nuten 8 sind Leiter 9,10 des In¬ duktors 1 angeordnet, die folglich ebenfalls zickzackförmig verlaufen.In FIG. 1, an inductor 1 and the material 2, 3 to be heated are shown in broken lines in two different widths. The inductor 1 has a core which is divided into four core sections 4, 5, 6, 7. These core sections 4, 5, 6, 7 have grooves 8 which are inclined in alternating alignment with the direction of transport of the metallic goods 2, 3 indicated by the arrow. In the embodiment, they are zigzag. Conductors 9, 10 of the inductor 1 are arranged in these grooves 8 and consequently likewise run in a zigzag shape.
Der Leiter 9 hat eigene Stromanschlüsse 11,12 und Leiter 10 hat ebenso eigene Stromanschlüsse 13,14, so daß zwei von¬ einander unabhängige Leitersysteme gebildet werden.The conductor 9 has its own power connections 11, 12 and conductor 10 also has its own power connections 13, 14, so that two mutually independent conductor systems are formed.
Betrachtet man zwei von einem zum anderen Ende des Induk¬ tors 1 verlaufende, benachbarte Leiterabschni te eines Lei¬ tersystemes, z.B. die Leiterabschnitte 15,16 des Leiters 9, so sind diese durch entgegengesetzte Stromrichtungen ge¬ kennzeichnet. Somit bildet jeder der Leiterabschnitte eines Leitersystems einen Pol des Induktors 1.If one considers two adjacent conductor sections of a conductor system, which run from one end to the other of the inductor 1, e.g. the conductor sections 15, 16 of the conductor 9 are identified by opposite current directions. Each of the conductor sections of a conductor system thus forms a pole of the inductor 1.
Benutzt man zur Erwärmung des metallischen Gutes 2,3 nur eines der Leitersysteme, z.B. das des Leiters 9, so ergäbe sich schon aufgrund der schmalen Pole und auch aufgrund der Zickzackführung des Leiters 9 eine recht gleichmäßige Er¬ wärmung des metallischen Gutes 2,3. Da aber das die Wirbel¬ ströme induzierende Magnetfeld zwischen den Polen maximal ist, ergibt sich auch an diesen Stellen eine maximale Er- wärmung des metal ischen Gutes 2,3, so daß über die Breite des metallischen Gutes 2,3 gesehen ein leicht periodischer Temperaturverlauf entsteht.If only one of the conductor systems, for example that of the conductor 9, is used to heat the metallic material 2, 3, the metallic material 2, 3 would be heated quite uniformly due to the narrow poles and also because of the zigzag guidance of the conductor 9. However, since the magnetic field between the poles inducing the eddy currents is at a maximum, there is also a maximum Heating of the metallic goods 2,3, so that a slightly periodic temperature profile occurs across the width of the metallic goods 2,3.
Zur weiteren Verbesserung dieses Temperaturverlaufes wird daher das zweite Leitungssystem mit dem Leiter 10 einge¬ setzt, dessen Leiterabschnitte, wie in Fig. 1 beispielhaft an den Leiterabschnitten 17,18 zu sehen, zwischen den Polen des anderen Leiters 9 verlaufen. Durch diese geometrische Anordnung der Leiter 9,10 tritt die maximale Erwärmung des metallischen Gutes 2,3 durch den einen Leiter 9 gerade in den Bereichen des metall schen Gutes 2,3 auf, in denen der andere Leiter 10 ein Temperaturminimum erzeugt hat.To further improve this temperature profile, the second line system with the conductor 10 is therefore used, the conductor sections of which, as can be seen in FIG. 1 by way of example on the conductor sections 17, 18, run between the poles of the other conductor 9. Due to this geometrical arrangement of the conductors 9, 10, the maximum heating of the metallic material 2, 3 by the one conductor 9 occurs precisely in the areas of the metallic material 2, 3 in which the other conductor 10 has generated a temperature minimum.
Damit die beiden Leitersysteme sich nicht gegenseitig in ihren Wirkungen negativ beeinflussen, werden sie taktweise in zeitlicher Aufeinanderfolge an ihre jeweilige, hier nicht dargestellte Stromquelle angeschlossen. Durch diese Maßnahme wird die Polbreite des Induktors 1 quasi halbiert, ohne daß dadurch der Wirkungsgrad erniedrigt würde.So that the two conductor systems do not negatively influence each other in their effects, they are connected in cycles to their respective current sources, not shown here, in chronological succession. As a result of this measure, the pole width of the inductor 1 is quasi halved without the efficiency being reduced thereby.
Da die beiden Leitersysteme mit ihren Leitern 9,10 getrennt voneinander schaltbar sind, können ihnen jeweils im zeitli¬ chen Mittel unterschiedliche Leistungen zugeführt werden. Dies kann z.B. dadurch geschehen, daß die Zeitdauer derSince the two conductor systems with their conductors 9, 10 can be switched separately from one another, they can each be supplied with different powers on average over time. This can e.g. happen by the fact that the duration of the
Strombeaufsc lagung des einen Leitersystems gegenüber der des anderen Leitersystems verkürzt wird. Es ist aber auch möglich, die Leitersysteme an zwei verschiedene, hier nicht dargestellte Umrichter anzuschließen und mit unter- schied!ichen Frequenzen zu speisen.Current supply of one conductor system is shortened compared to that of the other conductor system. However, it is also possible to connect the conductor systems to two different inverters (not shown here) and to feed them at different frequencies.
Die Beaufschlagung der verschiedenen Leitersysteme mit im zeitlichen Mittel unterschiedlichen Leistungen kann insbe¬ sondere zur Vermeidung von Randüberhitzungen am metalli- sehen Gut 2,3 nützlich sein. Wegen der räumlichen Begren-The application of different powers to the various conductor systems on average over time can be useful in particular to avoid edge overheating on the metallic material 2, 3. Because of the spatial limitations
2Uλ| d§§ metallischen Gutes 2,3 kommt es an seinem Rand zu erhöhten Wirbelstromdichten, wodurch hier eine Temperatur¬ überhöhung entstehen kann. Somit ist es sinnvoll, das Lei- tersystem, das hauptsächlich auf den Rand des metallischen Gutes 2,3 wirkt, mit einer im zeitlichen Mittel geringeren Leistung zu beaufschlagen. Hierfür ist es wichtig, daß ein bestimmtes Leitersystem, z.B. das des Leiters 9, an dem einen Rand des metallischen Gutes 2,3 auf die gleiche Weise einwirkt wie an dem gegenüberliegenden Rand, d.h. daß die Anordnung der Induktorleiter 9,10 im wesentlichen symme¬ trisch zur Mittelachse des metallischen Gutes 2,3 ist. Bei nicht geradlinigem Verlauf der Leiter 9,10 gilt diese Sym- metrieanforderung für die Mittelungsgeraden der vom einen bis zum anderen Ende des Induktors verlaufenden Leiterab¬ schnitte. Eine solche Mittelungsgerade 19 ist in Fig. 1 für den Leiterabschnitt 20 des Leiters 9 dargestellt. Diese Symmetrieanforderung, die sich nicht nur auf die Randberei- ehe des Induktors 1 bezieht, ist besonders vorteilhaft, wenn der Induktor 1, wie in Fig. 1 dargestellt, zur Erwär¬ mung von metallischem Gut 2,3 unterschiedlicher Breite dient.2Uλ | d§§ metallic goods 2, 3, eddy current densities occur at its edge, which can result in an increase in temperature. So it makes sense to tersystem, which mainly acts on the edge of the metallic goods 2,3, to be acted upon with a lower average power. For this it is important that a certain conductor system, for example that of the conductor 9, acts on one edge of the metallic material 2, 3 in the same way as on the opposite edge, ie that the arrangement of the inductor conductors 9, 10 is essentially symmetrical tric to the central axis of the metallic good 2.3. If the conductors 9, 10 are not rectilinear, this symmetry requirement applies to the averaging straight lines of the conductor sections running from one end to the other end of the inductor. Such an averaging line 19 is shown in FIG. 1 for the conductor section 20 of the conductor 9. This symmetry requirement, which relates not only to the edge region of the inductor 1, is particularly advantageous if the inductor 1, as shown in FIG. 1, is used to heat metallic material 2, 3 of different widths.
Fig. 2 zeigt einen Induktor 21 dessen Kern wie im zuvor be¬ schriebenen Induktor 1 in vier Abschnitte 22,23,24,25 auf¬ geteilt ist, und in denen ebenfalls Nuten 26 geneigt zu der durch den Pfeil angedeuteten Transportrichtung des zu er¬ wärmenden Gutes 27 verlaufen. Auch hier existieren zwei voneinander unabhängige Leitersysteme mit den Leitern 28,29. Im Unterschied zum zuvor beschriebenen Induktor 1 hat hier aber ein Leitersystem, das des Leiters 29, zwei Leiterabschnitte pro Pol, d.h. zwei direkt benachbarte Lei¬ terabschnitte, deren Stromrichtung identisch ist. Zwischen den Polen dieses Leiters 29 verlaufen die aus einem einzi¬ gen Leiterabschnitt bestehenden Pole des Leiters 28. Bezugszeichenliste2 shows an inductor 21, the core of which, as in the previously described inductor 1, is divided into four sections 22, 23, 24, 25, and in which also grooves 26 are inclined to the direction of transport indicated by the arrow warming good 27 run. Here, too, there are two independent conductor systems with the conductors 28, 29. In contrast to the previously described inductor 1, however, a conductor system, that of the conductor 29, has two conductor sections per pole, ie two directly adjacent conductor sections, the current direction of which is identical. The poles of the conductor 28, which consist of a single conductor section, run between the poles of this conductor 29. Reference list
I . Induktor 2. zu erwärmendes GutI. Inductor 2. Good to be heated
3. zu erwärmendes Gut3. Good to be heated
4. Kernabschnitt4th core section
5. Kernabschnitt5th core section
6. Kernabschnitt 7. Kernabschnitt6th core section 7th core section
8. Nut8. Groove
9. Leiter9. Head
10. Leiter10. Head
II. Stromanschluß 12. StromanschlußII. Power connection 12. Power connection
13. Stromanschluß13. Power connection
14. Stromanschluß14. Power connection
15. Leiterabschnitt15th ladder section
16. Leiterabschnitt 17. Leiterabschnitt16th ladder section 17th ladder section
18. Leiterabschnitt18th ladder section
19. Mittelungsgerade19. Averaging line
20. Leiterabschnitt20th ladder section
21. Induktor 22. Kernabschnitt21. Inductor 22. Core section
23. Kernabschnitt23rd core section
24. Kernabschnitt24th core section
25. Kernabschnitt25th core section
26. Nut 27. zu erwärmendes Gut26. Groove 27. Good to be heated
28. Leiter28th leader
29. Leiter 29. Head

Claims

Ansprüche Expectations
1. Vorrichtung zur induktiven Querfelderwärmung von flachem metallischem Gut (2,3,27), z.B. von Bändern und1.Device for inductive cross-field heating of flat metallic material (2,3,27), e.g. of tapes and
Platten, mit mindestens einem Induktorpaar, das einen Zwi¬ schenraum zum Hindurchtreten des Gutes bildet und dessen Induktoren (1) jeweils einen Eisenkern haben, der in Trans¬ portrichtung verlaufende, jeweils einen Stromleiter (9,10,28,29) aufnehmende Nuten (8,26) hat, wobei die Nuten (8,26) und Leiter (9,10,28,29) der Induktoren (1) eines Induktorpaares jeweils spiegelbildlich gleich verlaufen, dadurch gekennzeichnet, daß die Leiter (9,10,28,29) eines Induktors (1) jeweils zwei für sich schaltbare Leitersy- steme bilden, wobei jedes Leitersystem in Transportrichtung verlaufende Leiterabschnitte (15-18,20) besitzt, deren Mit¬ telungsgeraden (19) symmetrisch zu einer parallel zur Transportrichtung verlaufenden, induktormittigen Achse an¬ geordnet sind, daß die einzelnen Pole der Leitersysteme ma- ximal von zwei Leitern (9,10,28,29) gebildet sind und daß zwischen den Polen des einen Leitersystems jeweils ein Pol des anderen Leitersystem angeordnet ist.Plates with at least one pair of inductors, which forms an intermediate space for the material to pass through and whose inductors (1) each have an iron core, the grooves running in the transport direction and each receiving an electrical conductor (9, 10, 28, 29) ( 8.26), the grooves (8.26) and conductors (9, 10, 28, 29) of the inductors (1) of a pair of inductors each having the same mirror image, characterized in that the conductors (9, 10, 28, 29) of an inductor (1) each form two switchable conductor systems, each conductor system having conductor sections (15-18, 20) running in the transport direction, the middle straight lines (19) of which are symmetrical to an inductor-centered axis running parallel to the transport direction are arranged that the individual poles of the conductor systems are formed by a maximum of two conductors (9, 10, 28, 29) and that one pole of the other conductor system is arranged between the poles of one conductor system.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeich- net, daß die einzelnen Pole des einen Leitersystems jeweils von zwei Leitern (29) und die Pole des anderen Leitersy¬ stems jeweils von einem Leiter (28) gebildet sind.2. Device according to claim 1, characterized in that the individual poles of the one conductor system are each formed by two conductors (29) and the poles of the other conductor system are each formed by one conductor (28).
'3. Vorrichtung nach Anspruch 1 oder 2, dadurch ge- kennzeichnet, daß die Nuten (8,26) und Leiter (9,10,28,29) der Induktoren (1) geradlinig, Zickzack- oder wellenförmig verlaufen. '3. Apparatus according to claim 1 or 2, characterized denotes Ge, that the grooves (8,26) and conductor (9,10,28,29) of the inductors (1) a straight line extending zigzag or wavy.
4. Vorrichtung nach einem der vorhergehenden Ansprü- ehe, dadurch gekennzeichnet, daß die Kerne von Induktoren in Transportrichtung in Kernabschnitte (4-7,22-25) unter¬ teilt sind. 4. Device according to one of the preceding claims, characterized in that the cores of inductors are divided into core sections (4-7, 22-25) in the transport direction.
5. Vorrichtung nach einem der vorhergehenden Ansprü¬ che, dadurch gekennzeichnet, daß die Induktoren (1) und das zu erwärmende Gut (2,3,27) induktormittig relativ zueinan¬ der ausrichtbar sind.5. Device according to one of the preceding claims, characterized in that the inductors (1) and the material to be heated (2, 3, 27) can be aligned relative to one another in the inductor center.
6. Verfahren zur Anwendung der Vorrichtung nach ei¬ nem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß die beiden Leitersysteme getaktet und zeitversetzt zu¬ einander geschaltet werden.6. The method for using the device according to one of the preceding claims, characterized in that the two conductor systems are clocked and shifted in time with each other.
7. Verfahren nach Anspruch 6, dadurch gekennzeich¬ net, daß die beiden Leitersysteme nacheinander an die selbe Stromquelle angeschlossen werden.7. The method according to claim 6, characterized gekennzeich¬ net that the two conductor systems are successively connected to the same power source.
8. Verfahren nach Anspruch 6, dadurch gekennzeich¬ net, daß die beiden Leitersysteme nacheinander an separate Stromquellen angeschlossen werden.8. The method according to claim 6, characterized gekennzeich¬ net that the two conductor systems are successively connected to separate power sources.
9. Verfahren nach einem der Ansprüche 6-8, dadurch gekennzeichnet, daß die beiden Leitersysteme über ungleiche9. The method according to any one of claims 6-8, characterized in that the two conductor systems over unequal
Zeitdauern an die jeweilige Stromquelle angeschlossen wer¬ den.Time periods are connected to the respective power source.
10. Verfahren nach einem der Ansprüche 6-9, dadurch gekennzeichnet, daß die beiden Leitersysteme mit zeitlichem10. The method according to any one of claims 6-9, characterized in that the two conductor systems with temporal
Abstand an die jeweil ge Stromquelle angeschlossen werden. Distance to the respective ge power source.
EP95921684A 1994-06-15 1995-06-13 Device for inductive cross-field heating of flat metallic goods Expired - Lifetime EP0765591B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4420553 1994-06-15
DE4420553 1994-06-15
PCT/DE1995/000757 WO1995035013A1 (en) 1994-06-15 1995-06-13 Process and device for inductive cross-field heating of flat metallic goods

Publications (2)

Publication Number Publication Date
EP0765591A1 true EP0765591A1 (en) 1997-04-02
EP0765591B1 EP0765591B1 (en) 1998-11-25

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EP (1) EP0765591B1 (en)
AT (1) ATE173875T1 (en)
DE (1) DE59504341D1 (en)
WO (1) WO1995035013A1 (en)

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Publication number Priority date Publication date Assignee Title
FR2808163B1 (en) * 2000-04-19 2002-11-08 Celes TRANSVERSE FLOW INDUCTION HEATING DEVICE WITH MAGNETIC CIRCUIT OF VARIABLE WIDTH
FR2890824B1 (en) * 2005-09-15 2007-11-23 Commissariat Energie Atomique MELTING FURNACE WITH INDUCING DEVICE WITH A SINGLE SPIRE COMPRISING A PLURALITY OF CONDUCTORS
EP2045340A1 (en) * 2007-09-25 2009-04-08 ArcelorMittal France Comb-shaped laminated cylinder head for an inducer with a magnetic field passing through it for reheating strips of metal
DE102009026236A1 (en) * 2009-07-23 2011-04-07 Atn Automatisierungstechnik Niemeier Gmbh Method for integrally joining joining partners
JP6201777B2 (en) * 2013-06-27 2017-09-27 トヨタ車体株式会社 Induction heating dryer
EP2838123B1 (en) * 2013-08-14 2016-03-16 Komax Holding AG Welding device for connecting solar cells

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GB712066A (en) * 1951-02-03 1954-07-14 Asea Ab High-frequency electromagnetic induction means for heating metallic strips
DE1158194B (en) * 1962-06-22 1963-11-28 Zd Y Elektrotepelnych Zarizeni Inductor arrangement for inductive heating of continuous metal strips
US4122321A (en) * 1977-02-16 1978-10-24 Park-Ohio Industries, Inc. Induction heating furnace
GB8505811D0 (en) * 1985-03-06 1985-04-11 Bekaert Sa Nv Induction heating
DE3928629A1 (en) * 1989-08-30 1991-03-14 Junker Gmbh O DEVICE FOR INDUCTIVE HEATING OF FLAT METAL GOODS
GB2262420B (en) * 1991-12-03 1995-02-08 Electricity Ass Tech Induction heating apparatus
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Title
See references of WO9535013A1 *

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Publication number Publication date
EP0765591B1 (en) 1998-11-25
ATE173875T1 (en) 1998-12-15
WO1995035013A1 (en) 1995-12-21
US5818013A (en) 1998-10-06
DE59504341D1 (en) 1999-01-07

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