EP0765591B1 - Device for inductive cross-field heating of flat metallic goods - Google Patents
Device for inductive cross-field heating of flat metallic goods Download PDFInfo
- Publication number
- EP0765591B1 EP0765591B1 EP95921684A EP95921684A EP0765591B1 EP 0765591 B1 EP0765591 B1 EP 0765591B1 EP 95921684 A EP95921684 A EP 95921684A EP 95921684 A EP95921684 A EP 95921684A EP 0765591 B1 EP0765591 B1 EP 0765591B1
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- European Patent Office
- Prior art keywords
- lead
- inductors
- conductor
- inductor
- goods
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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
- H05B6/362—Coil arrangements with flat coil conductors
Definitions
- the invention relates to a device for inductive cross-field heating of flat metallic goods, e.g. of tapes and plates, with at least one pair of inductors, one Forms an intermediate space for the passage of the good and its Inductors each have an iron core in the direction of transport running, each receiving a conductor Has grooves, the grooves and conductors of the inductors of a pair of inductors each mirror the same.
- DE-OS 39 28 629 is a device for inductive Heating flat metallic goods known to involve several switchable conductor loops are provided, each with two ladder parts, the right one Conductor part just as far from the right edge of the inductor is like the left part of the ladder 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 crop width will. All conductor loops are switched on effective at the same time, there is no clocking.
- WO 93/11650 describes a device for inductive Heating with two conductor systems per inductor is known. This creates a conductor system across the width of the metallic goods are considered to be roughly sinusoidal Course of the induced current density, the period of Width of the goods corresponds. To achieve the desired Course and thus to reach the associated pole width is a number of adjacent conductors of this conductor system flowed through in the same direction. The width of the Pole is determined by the desired match of period length and width of the goods determined by the latter. This first conductor system thus generates one approximately sinusoidal course of the temperature in the to be heated Good.
- the second conductor system now also produces across the width of the material to be heated has a sinusoidal course of the induced Current density, but about ⁇ / 4 compared to the first Ladder system offset so that through this second ladder system precisely the places of the metallic goods most warmed that were previously minimally warmed by the first conductor system.
- the two conductor systems are consecutive switchable. Working with just one ladder system would do so result in a very different temperature distribution and cannot be accepted.
- the disadvantage of this arrangement is that the Inductor predetermined sinusoidal distribution of the induced Current density only to a certain width of the to be heated metallic good. Furthermore, with this device complex measures to avoid edge overheating in the metallic goods are operated.
- the solution achieved this task in that the conductor of an inductor each form two switchable conductor systems, each Conductor system in the direction of transport has, whose averaging lines are symmetrical to a parallel to Transport direction extending, inductor-centered axis arranged are that the individual poles formed by the conductor systems are formed by a maximum of two conductors and that between neighboring poles each formed by the one conductor system a pole formed by the other conductor system is arranged.
- the poles can Be narrow, so that the temperature distribution across the width of the metallic good considered a fairly high uniformity.
- the the second conductor system with its poles is now between the Tru of the first conductor system and produced with a time delay a maximum density of the induced just at the points Eddy currents at which the first conductor system has a minimal Density generated. This results in a smoothing of the temperature profile.
- the two ladder systems are timed switched one after the other because at the same time it is loaded with electricity due to the then short distances between two neighboring ones, through which electricity flows simultaneously Conductors would reduce the efficiency of the inductor. The Switching the two conductor systems in series thus brings about almost without loss in the efficiency of the inductor the density of the inductor lines.
- the required Symmetry refers to a non-straight line Course of the ladder on averaging lines of the ladder sections, seen in the direction of transport from one to the the other end of the inductor.
- both edges of the metallic good can match these edges, e.g. to avoid edge overheating, equally be influenced.
- both conductor systems are switchable, especially the conductor system, which acts on these marginal areas on average with a lower power.
- the device according to the invention can also be designed that the individual poles formed by the one conductor system each of two conductors and that of the other conductor system Poles formed are each formed by a conductor.
- the device according to the invention can be designed in this way be that the grooves and conductors of the inductors are straight, zigzag or wavy.
- the device according to the invention can be designed in this way be that the cores of inductors in the direction of transport Core sections are divided.
- the device according to the invention can also do so be trained that the inductors and the material to be heated can be aligned relative to one another in the inductor center.
- the metallic material can always be used as an inductor be aligned so that the conductor systems are symmetrical to the center of the metallic good. This is a requirement for the even heat treatment of both edges of the metallic Good.
- the device can be operated so that the two Conductor systems connected in succession to the same power source will.
- the device can also be operated so that the two conductor systems to the respective power source can be connected.
- the device can be operated so that the two conductor systems at intervals to the respective power source can be connected.
- Fig. 1 is an inductor 1 and dashed that to be heated Well 2.3 shown in two different widths.
- the inductor 1 has a core that is divided into four core sections 4,5,6,7 is divided. These have core sections 4,5,6,7 Grooves 8, which are in alternating alignment to that by the Arrow indicated transport direction of the metallic goods 2.3 are inclined. In the embodiment, they run zigzag. In these grooves 8 are conductors 9, 10 of the inductor 1 arranged, which is consequently also zigzag run.
- the conductor 9 has its own power connections 11, 12 and conductor 10 also has its own power connections 13, 14, so that two of them independent ladder systems are formed.
- the second line system with the conductor 10 used its conductor sections, as an example in Fig. 1 can be seen on the conductor sections 17, 18, between the poles of the other conductor 9 run.
- the conductors 9.10 occurs the maximum heating of the metallic good 2,3 through a conductor 9 straight in the areas of the metallic goods 2,3, in which the other conductor 10 has generated a minimum temperature.
- the two conductor systems with their conductors 9, 10 are separated are switchable from each other, they can be timed Means different services are supplied. This can e.g. happen by the fact that the duration of the Current applied to one conductor system compared to the of the other conductor system is shortened. It is also possible to connect the conductor systems to two different ones, not here shown inverters to connect and with different Frequencies to feed.
- Fig. 2 shows an inductor 21 whose core as in the previously described Inductor 1 divided into four sections 22,23,24,25 is, and in which also grooves 26 inclined to the indicated by the arrow transport direction of the to be heated Good 27 run.
Abstract
Description
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 Induktoren eines Induktorpaares jeweils spiegelbildlich gleich verlaufen.The invention relates to a device for inductive cross-field heating of flat metallic goods, e.g. of tapes and plates, with at least one pair of inductors, one Forms an intermediate space for the passage of the good and its Inductors each have an iron core in the direction of transport running, each receiving a conductor Has grooves, the grooves and conductors of the inductors of a pair of inductors each mirror the same.
Aus der DE-OS 39 28 629 ist eine Vorrichtung zum induktiven Erwärmen von flachem metallischem Gut bekannt, bei der mehrere für sich schaltbare Leiterschleifen vorgesehen sind, die jeweils zwei Leiterteile haben, wobei jeweils der rechte Leiterteil ebenso weit vom rechten Rand des Induktors entfernt ist wie der linke Leiterteil vom linken Rand des Induktors. Durch Zu- oder Abschalten dieser Leiterschleifen kann die wirksame Breite des Induktors der Gutbreite angepaßt werden. Alle eingeschalteten Leiterschleifen sind gleichzeitig wirksam, ein Takten liegt nicht vor.DE-OS 39 28 629 is a device for inductive Heating flat metallic goods known to involve several switchable conductor loops are provided, each with two ladder parts, the right one Conductor part just as far from the right edge of the inductor is like the left part of the ladder 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 crop width will. All conductor loops are switched on effective at the same time, there is no clocking.
Aus der WO 93/11650 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 Leitersystems gleichsinnig vom Strom durchflossen. Die Breite der Pole wird durch die gewünschte Übereinstimmung von Periodenlänge und Breite des Gutes durch letztere bestimmt. Dieses erste Leitersystem erzeugt somit einen in etwa sinusförmigen 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, allerdings etwa um π/4 gegenüber 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 Leitersysteme sind dazu zeitlich nacheinander schaltbar. Das Arbeiten allein eines Leitersystems würde dabei eine stark unterschiedliche Temperaturverteilung zur Folge haben und nicht akzeptiert werden können.WO 93/11650 describes a device for inductive Heating with two conductor systems per inductor is known. This creates a conductor system across the width of the metallic goods are considered to be roughly sinusoidal Course of the induced current density, the period of Width of the goods corresponds. To achieve the desired Course and thus to reach the associated pole width is a number of adjacent conductors of this conductor system flowed through in the same direction. The width of the Pole is determined by the desired match of period length and width of the goods determined by the latter. This first conductor system thus generates one approximately sinusoidal course of the temperature in the to be heated Good. The second conductor system now also produces across the width of the material to be heated has a sinusoidal course of the induced Current density, but about π / 4 compared to the first Ladder system offset so that through this second ladder system precisely the places of the metallic goods most warmed that were previously minimally warmed by the first conductor system. For this purpose, the two conductor systems are consecutive switchable. Working with just one ladder system would do so result in a very different temperature distribution and cannot be accepted.
Der Nachteil dieser Anordnung besteht darin, daß die durch den Induktor vorgegebene sinusförmige Verteilung der induzierten Stromdichte nur zu einer bestimmten Breite des zu erwärmenden metallischen Gutes paßt. Desweiteren müssen bei dieser Vorrichtung aufwendige Maßnahmen zur Vermeidung einer Randüberhitzung im metallischen Gut betrieben werden.The disadvantage of this arrangement is that the Inductor predetermined sinusoidal distribution of the induced Current density only to a certain width of the to be heated metallic good. Furthermore, with this device complex measures to avoid edge overheating in the metallic goods are operated.
Es ist nun Aufgabe der vorliegenden Erfindung, eine Vorrichtung der eingangs erwähnten Art anzugeben, womit im zu erwärmenden metallischen Gut ein möglichst gleichmäßiger Temperaturverlauf erreicht und eine Randüberhitzung vermieden wird.It is an object of the present invention to provide a device of the type mentioned at the beginning, with which to be heated metallic material, a temperature profile that is as uniform as possible reached and edge overheating is avoided.
Bei einer Vorrichtung der eingangs erwähnten Art wird die Lösung dieser Aufgabe dadurch erreicht, daß die Leiter eines Induktors jeweils zwei für sich schaltbare Leitersysteme bilden, wobei jedes Leitersystem in Transportrichtung verlaufende Leiterabschnitte besitzt, deren Mittelungsgeraden symmetrisch zu einer parallel zur Transportrichtung verlaufenden, induktormittigen Achse angeordnet sind, daß die einzelnen, von den Leitersystemen gebildeten Pole maximal von zwei Leitern gebildet sind und daß zwischen benachbarten, von dem einen Leitersystem gebildeten Polen jeweils ein von dem anderen Leitersystem gebildeter Pol angeordnet ist. In a device of the type mentioned in the introduction, the solution achieved this task in that the conductor of an inductor each form two switchable conductor systems, each Conductor system in the direction of transport has, whose averaging lines are symmetrical to a parallel to Transport direction extending, inductor-centered axis arranged are that the individual poles formed by the conductor systems are formed by a maximum of two conductors and that between neighboring poles each formed by the one conductor system a pole formed by the other conductor system is arranged.
Da maximal zwei Leiter einen Pol bilden, können die Pole schmal gestalten werden, so daß schon dadurch die Temperaturverteilung über die Breite des metallischen Gutes betrachtet eine recht hohe Gleichmäßigkeit aufweist. Das zweite Leitersystem liegt mit seinen Polen nun zwischen den Polen des ersten Leitersystems und erzeugt zeitversetzt gerade 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 Temperaturverlaufes. Die beiden Leitersysteme werden zeitlich nacheinander geschaltet, da bei gleichzeitiger Beaufschlagung 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 Induktorleitungen.Since a maximum of two conductors form a pole, the poles can Be narrow, so that the temperature distribution across the width of the metallic good considered a fairly high uniformity. The the second conductor system with its poles is now between the Poland of the first conductor system and produced with a time delay a maximum density of the induced just at the points Eddy currents at which the first conductor system has a minimal Density generated. This results in a smoothing of the temperature profile. The two ladder systems are timed switched one after the other because at the same time it is loaded with electricity due to the then short distances between two neighboring ones, through which electricity flows simultaneously Conductors would reduce the efficiency of the inductor. The Switching the two conductor systems in series thus brings about almost without loss in the efficiency of the inductor the density of the inductor lines.
Da der Induktor zu einer in Transportrichtung weisenden induktormittigen Achse im wesentlichen symmetrisch aufgebaut ist, können auch bei variierenden Breiten des zu erwärmenden Gutes die Bedingungen an den Rändern des zu erwärmenden Gutes auf beiden Seiten gleich gehalten werden. Die geforderte Symmetrie bezieht sich bei einem nicht geradlinigen Verlauf der Leiter auf Mittelungsgeraden der Leiterabschnitte, die in Transportrichtung gesehen von einem zum anderen Ende des Induktors verlaufen.Since the inductor is pointing towards the transport direction the axis of the inductor is essentially symmetrical can, even with varying widths of the to be heated Good the conditions on the edges of the to be heated Good things are kept the same on both sides. The required Symmetry refers to a non-straight line Course of the ladder on averaging lines of the ladder sections, seen in the direction of transport from one to the the other end of the inductor.
Da aufgrund der Symmetrie die Verhältnisse an beiden Rändern des metallischen Gutes übereinstimmen, kann auf diese Ränder, z.B. zur Vermeidung von Randüberhitzungen, gleichermaßen eingewirkt werden. Z.B. kann, da beide Leitersysteme für sich schaltbar sind, speziell das Leitersystem, das gerade auf diese Randbereiche einwirkt, im zeitlichen Mittel mit einer geringeren Leistung beaufschlagt werden. Because of the symmetry, the conditions on both edges of the metallic good can match these edges, e.g. to avoid edge overheating, equally be influenced. E.g. can, since both conductor systems are switchable, especially the conductor system, which acts on these marginal areas on average with a lower power.
Die erfindungsgemäße Vorrichtung kann auch so ausgebildet sein, daß die einzelnen von dem einen Leitersystem gebildeten Pole jeweils von zwei Leitern und die von dem anderen Leitersystem gebildeten Pole jeweils von einem Leiter gebildet sind.The device according to the invention can also be designed that the individual poles formed by the one conductor system each of two conductors and that of the other conductor system Poles formed are each formed by a conductor.
Hierdurch wird aufgrund der erhöhten Polbreite der Wirkungsgrad des einen Leitersystems erhöht.This increases the efficiency due to the increased pole width of a conductor system increased.
Desweiteren kann die erfindungsgemäße Vorrichtung so ausgebildet sein, daß die Nuten und Leiter der Induktoren geradlinig, zickzack- oder wellenförmig verlaufen.Furthermore, the device according to the invention can be designed in this way be that the grooves and conductors of the inductors are straight, zigzag or wavy.
Weiterhin kann die erfindungsgemäße Vorrichtung so ausgestaltet sein, daß die Kerne von Induktoren in Transportrichtung in Kernabschnitte unterteilt sind.Furthermore, the device according to the invention can be designed in this way be that the cores of inductors in the direction of transport Core sections are divided.
Hierdurch erleichtert sich die Herstellung ausgedehnter Induktoren besonders dann, wenn einzelne Induktorabschnitte einen zueinander unterschiedlichen Aufbau, z.B. im Verlauf der Nuten haben.This facilitates the manufacture of extensive inductors especially when individual inductor sections meet one another different structure, e.g. in the course of the grooves.
Schließlich kann die erfindungsgemäße Vorrichtung auch so ausgebildet sein, daß die Induktoren und das zu erwärmende Gut induktormittig relativ zueinander ausrichtbar sind.Finally, the device according to the invention can also do so be trained 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 Temperaturprofil des zu erwärmenden Gutes ausgegangen werden und an beiden Rändern dieses Gutes eine gleiche Temperaturverteilung eingestellt werden. Hierdurch kann das metallische Gut stets so zum Induktor ausgerichtet werden, daß die Leitersysteme symmetrisch zur Mitte des metallischen Gutes verlaufen. Dies ist eine Voraussetzung für die gleichmäßige Wärmebehandlung beider Ränder des metallischen Gutes.With such an orientation, a temperature profile of the to be warmed up good and on both edges an equal temperature distribution can be set for this good. As a result, the metallic material can always be used as an inductor be aligned so that the conductor systems are symmetrical to the center of the metallic good. This is a requirement for the even heat treatment of both edges of the metallic Good.
Die Vorrichtung kann so betrieben werden, daß die beiden Leitersysteme nacheinander an dieselbe Stromquelle angeschlossen werden. The device can be operated so that the two Conductor systems connected in succession to the same power source will.
Sie kann auch so betrieben werden, daß die beiden Leitersysteme nacheinander an separate Stromquellen angeschlossen werden.It can also be operated so that the two conductor systems successively connected to separate power sources will.
Hierdurch ist es möglich, die verschiedenen Leitersysteme mit unterschiedlichen Frequenzen zu beaufschlagen. Somit könnte also zur Vermeidung von Randüberhitzungen dem Leitersystem, das stärker auf die Ränder des metallischen Gutes wirkt, über die Frequenz eine geringere Leistung zugeführt werden.This makes it possible to use the different conductor systems to be charged with different frequencies. Consequently could prevent the conductor system from overheating, the stronger on the edges of the metallic good acts, a lower power is supplied via the frequency will.
Die Vorrichtung kann weiterhin auch so betrieben werden, daß die beiden Leitersysteme über ungleiche Zeitdauern an die jeweilige Stromquelle angeschlossen werden.The device can also be operated so that the two conductor systems to the respective power source can be connected.
Hierdurch kann auch bei identischen Frequenzen im zeitlichen Mittel gesehen den unterschiedlichen Leitersystem eine unterschiedliche Leistung zugeführt werden. Dazu muß das Leitersystem mit geringerem Leistungsbedarf für kürzere Zeitdauern an die Stromquelle angeschlossen werden als das andere Leitersystem.As a result, even at identical frequencies in time Seen the different conductor system one different power can be supplied. To do this, the Conductor system with lower power requirements for shorter ones Time periods connected to the power source than that other ladder system.
Schließlich kann die Vorrichtung so betrieben werden, daß die beiden Leitersysteme mit zeitlichem Abstand an die jeweilige Stromquelle angeschlossen werden.Finally, the device can be operated so that the two conductor systems at intervals to the respective power source can be connected.
Im folgenden werden Ausführungsformen der erfindungsgemäßen Vorrichtung anhand von Figuren erläutert.The following are embodiments of the invention Device explained using figures.
Es zeigt
- Fig. 1:
- in schematischer Darstellung die Aufsicht auf einen erfindungsgemäßen Induktor, wobei beide Leitersysteme jeweils einen Leiter pro Pol aufweisen, und
- Fig. 2:
- eine Darstellung gemäß Fig. 1, wobei ein Leitersystem zwei Leiter pro Pol und das andere Leitersystem einen Leiter pro Pol aufweist.
- Fig. 1:
- in a schematic representation, the supervision of an inductor according to the invention, both conductor systems each having one conductor per pole, and
- Fig. 2:
- a representation of FIG. 1, wherein a 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 erwärmende
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 Induktors
1 angeordnet, die folglich ebenfalls zickzackförmig
verlaufen.In Fig. 1 is an inductor 1 and dashed that to be heated
Well 2.3 shown in two different widths.
The inductor 1 has a core that is divided into four
Der Leiter 9 hat eigene Stromanschlüsse 11,12 und Leiter 10
hat ebenso eigene Stromanschlüsse 13,14, so daß zwei voneinander
unabhängige Leitersysteme gebildet werden.The
Betrachtet man zwei von einem zum anderen Ende des Induktors
1 verlaufende, benachbarte Leiterabschnitte eines Leitersystemes,
z.B. die Leiterabschnitte 15,16 des Leiters 9,
so sind diese durch entgegengesetzte Stromrichtungen gekennzeichnet.
Somit bildet jeder der leiterabschnitte 15, 16 eines
Leitersystems einen Pol des Induktors 1.Looking at two from one end of the inductor to the other
1 running, adjacent conductor sections of a conductor system,
e.g. the
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 Erwärmung
des metallischen Gutes 2,3. Da aber das die Wirbelströme
induzierende Magnetfeld zwischen den Polen maximal
ist, ergibt sich auch an diesen Stellen eine maximale Erwärmung
des metallischen Gutes 2,3, so daß über die Breite
des metallischen Gutes 2,3 gesehen ein leicht periodischer
Temperaturverlauf entsteht.Only used to heat the
Zur weiteren Verbesserung dieses Temperaturverlaufes wird
daher das zweite Leitungssystem mit dem Leiter 10 eingesetzt,
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 metallischen Gutes 2,3 auf, in denen der
andere Leiter 10 ein Temperaturminimum erzeugt hat.To further improve this temperature profile
therefore the second line system with the
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 are not in each other negatively affect their effects, they become cyclical in chronological order to their respective, here Power source, not shown, connected. Through this Measure, the pole width of the inductor 1 is almost halved, without lowering the efficiency.
Da die beiden Leitersysteme mit ihren Leitern 9,10 getrennt
voneinander schaltbar sind, können ihnen jeweils im zeitlichen
Mittel unterschiedliche Leistungen zugeführt werden.
Dies kann z.B. dadurch geschehen, daß die Zeitdauer der
Strombeaufschlagung 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 unterschiedlichen
Frequenzen zu speisen.Since the two conductor systems with their
Die Beaufschlagung der verschiedenen Leitersysteme mit im
zeitlichen Mittel unterschiedlichen Leistungen kann insbesondere
zur Vermeidung von Randüberhitzungen am metallischen
Gut 2,3 nützlich sein. Wegen der räumlichen Begrenzung
des metallischen Gutes 2,3 kommt es an seinem Rand zu
erhöhten Wirbelstromdichten, wodurch hier eine Temperaturüberhöhung
entstehen kann. Somit ist es sinnvoll, das Leitersystem,
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 symmetrisch
zur Mittelachse des metallischen Gutes 2,3 ist. Bei
nicht geradlinigem Verlauf der Leiter 9,10 gilt diese Symmetrieanforderung
für die Mittelungsgeraden der vom einen
bis zum anderen Ende des Induktors verlaufenden Leiterabschnitte.
Eine solche Mittelungsgerade 19 ist in Fig. 1 für
den Leiterabschnitt 20 des Leiters 9 dargestellt. Diese
symmetrieanforderung, die sich nicht nur auf die Randbereiche
des Induktors 1 bezieht, ist besonders vorteilhaft,
wenn der Induktor 1, wie in Fig. 1 dargestellt, zur Erwärmung
von metallischem Gut 2,3 unterschiedlicher Breite
dient.The application of various conductor systems to the
time means different services in particular
to avoid edge overheating on the metallic
A good 2.3 will be useful. Because of the spatial limitation
of the metallic good 2, 3 occurs at its edge
increased eddy current densities, causing a temperature rise here
can arise. So it makes sense to
mainly on the edge of the
Fig. 2 zeigt einen Induktor 21 dessen Kern wie im zuvor beschriebenen
Induktor 1 in vier Abschnitte 22,23,24,25 aufgeteilt
ist, und in denen ebenfalls Nuten 26 geneigt zu der
durch den Pfeil angedeuteten Transportrichtung des zu erwärmenden
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 Leiterabschnitte,
deren Stromrichtung identisch ist. Zwischen
den Polen dieses Leiters 29 verlaufen die aus einem einzigen
Leiterabschnitt bestehenden Pole des Leiters 28. Fig. 2 shows an
- 1.1.
- InduktorInductor
- 2.2nd
- zu erwärmendes GutGood to be warmed
- 3.3rd
- zu erwärmendes GutGood to be warmed
- 4.4th
- KernabschnittCore section
- 5.5.
- KernabschnittCore section
- 6.6.
- KernabschnittCore section
- 7.7.
- KernabschnittCore section
- 8.8th.
- NutGroove
- 9.9.
- Leiterladder
- 10.10th
- Leiterladder
- 11.11.
- StromanschlußPower connection
- 12.12th
- StromanschlußPower connection
- 13.13.
- StromanschlußPower connection
- 14.14.
- StromanschlußPower connection
- 15.15.
- LeiterabschnittConductor section
- 16.16.
- LeiterabschnittConductor section
- 17.17th
- LeiterabschnittConductor section
- 18.18th
- LeiterabschnittConductor section
- 19.19th
- MittelungsgeradeStraight line
- 20.20th
- LeiterabschnittConductor section
- 21.21.
- InduktorInductor
- 22.22.
- KernabschnittCore section
- 23.23.
- KernabschnittCore section
- 24.24th
- KernabschnittCore section
- 25.25th
- KernabschnittCore section
- 26.26.
- NutGroove
- 27.27.
- zu erwärmendes GutGood to be warmed
- 28.28
- Leiterladder
- 29.29.
- Leiterladder
Claims (5)
- Device for inductive cross-field heating of flat metallic material (2, 3; 27), for example strips and plates, having at least one pair of inductors which form a gap for the material (2, 3; 27) to pass through and whose inductors (1; 21) each have an iron core (4-7; 22-25) which has grooves (8; 26) running in the transport direction and each receiving a lead (9, 10; 28, 29), the grooves (8; 26) and leads (9, 10; 28, 29) of the inductors (1; 21) of a pair of inductors each being mirror symmetrical, characterized in that the leads (9, 10; 28, 29) of one inductor (1; 21) each form two independently switchable lead systems, each lead system having lead sections (15-18; 20) which extend in the transport direction and whose centre lines (19) are arranged symmetrically to a centre axis of the inductor extending parallel to the transport direction, in that the individual poles formed by the lead systems are formed by a maximum of two leads (9, 10; 28, 29), and in that a pole formed by one lead system is arranged in each case between adjacent poles formed by the other lead system.
- Device according to Claim 1, characterized in that the individual poles formed by one lead system are each formed by two leads (29), and the poles formed by the other lead system are each formed by one lead (28).
- Device according to Claim 1 or 2, characterized in that the grooves (8; 26) and leads (9, 10; 28, 29) of the inductors (1; 21) extend in a straight line or in a zigzag or undulating manner.
- Device according to any of the preceding claims, characterized in that the cores of the inductors are divided into core sections (4-7; 22-25) in the transport direction.
- Device according to any of the preceding claims, characterized in that the inductors (1; 21) and the material (2, 3; 27) to be heated can be aligned relative to one another in the centre of the inductor.
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 EP0765591A1 (en) | 1997-04-02 |
| EP0765591B1 true EP0765591B1 (en) | 1998-11-25 |
Family
ID=6520428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95921684A Expired - Lifetime EP0765591B1 (en) | 1994-06-15 | 1995-06-13 | Device for inductive cross-field heating of flat metallic goods |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5818013A (en) |
| EP (1) | EP0765591B1 (en) |
| AT (1) | ATE173875T1 (en) |
| DE (1) | DE59504341D1 (en) |
| WO (1) | WO1995035013A1 (en) |
Families Citing this family (6)
| 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 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US5308946A (en) * | 1992-02-06 | 1994-05-03 | Mohr Glenn R | Induction heating apparatus and method for heating metal strips and slabs |
-
1995
- 1995-06-13 AT AT95921684T patent/ATE173875T1/en not_active IP Right Cessation
- 1995-06-13 US US08/750,590 patent/US5818013A/en not_active Expired - Fee Related
- 1995-06-13 EP EP95921684A patent/EP0765591B1/en not_active Expired - Lifetime
- 1995-06-13 WO PCT/DE1995/000757 patent/WO1995035013A1/en active IP Right Grant
- 1995-06-13 DE DE59504341T patent/DE59504341D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| ATE173875T1 (en) | 1998-12-15 |
| DE59504341D1 (en) | 1999-01-07 |
| WO1995035013A1 (en) | 1995-12-21 |
| EP0765591A1 (en) | 1997-04-02 |
| US5818013A (en) | 1998-10-06 |
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