EP2671425B1 - Method for producing an electrical coil and electrical coil - Google Patents

Method for producing an electrical coil and electrical coil Download PDF

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Publication number
EP2671425B1
EP2671425B1 EP12702030.3A EP12702030A EP2671425B1 EP 2671425 B1 EP2671425 B1 EP 2671425B1 EP 12702030 A EP12702030 A EP 12702030A EP 2671425 B1 EP2671425 B1 EP 2671425B1
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EP
European Patent Office
Prior art keywords
thick
film paste
nanoparticles
coil
nano
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.)
Not-in-force
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EP12702030.3A
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German (de)
French (fr)
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EP2671425A1 (en
Inventor
Lutz Ose
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EGO Elektro Geratebau GmbH
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EGO Elektro Geratebau GmbH
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Publication of EP2671425A1 publication Critical patent/EP2671425A1/en
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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
    • H05B6/12—Cooking devices
    • H05B6/1209—Cooking devices induction cooking plates or the like and devices to be used in combination with them
    • H05B6/1245—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements
    • H05B6/1281—Cooking devices induction cooking plates or the like and devices to be used in combination with them with special coil arrangements with flat coils
    • 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
    • H05B2214/00—Aspects relating to resistive heating, induction heating and heating using microwaves, covered by groups H05B3/00, H05B6/00
    • H05B2214/04—Heating means manufactured by using nanotechnology

Definitions

  • the invention relates to a method for producing an electrical coil and such an electrical coil.
  • the invention has for its object to provide an aforementioned method for producing an electrical coil and an electric coil produced therewith, with which disadvantages of the prior art can be avoided and in particular a practical and good quality manageable process can be created for the production of such coils, preferably of induction coils.
  • a conventional thick-film paste as for example from the aforementioned EP 2120508 A2 is known, applied to the carrier in the desired geometry. Although it can also have nano-particles, but not yet advantageous.
  • the surface of the applied thick-film paste is enriched with nano-particles. Due to the special nature and duration of the enrichment process or application process, the proportion of nano-particles can be influenced.
  • the thick-film paste with the applied nano-particles is dried and baked. During firing, a homogeneously mixed layer results which contains a certain proportion of the nano-particles.
  • the nano-particles are applied in a fluidized bed process on the thick-film paste or its surface for enrichment.
  • relatively high levels of nano-particles can be achieved on the finished conductor material.
  • this also makes it possible to apply the nanoparticles in a certain predetermined thickness on the surface.
  • a certain predetermined concentration of nano-particles in the conductor material can ultimately be achieved in the finished conductor material.
  • problems of possibly unfavorable for a screen printing or other application method viscosities in the thick-film paste can be avoided.
  • this method is particularly preferably carried out with a still moist thick-film paste, ie in particular very short or even directly after the application of the thick-film paste itself.
  • an additional covering layer or protective layer is applied to the surface enriched with nano-particles.
  • This can be applied before baking the thick-film paste including nano-particles and then prevent loose nano-particles from entering the surrounding air and causing a health hazard.
  • this allows a kind of fixation of the nano-particles on the thick-film paste, until they are quasi integrated during firing and thus fixed.
  • a covering layer can be applied to the finished conductor or the finished coil structure. This provides protection against external damage, electrical insulation and protection against oxidation. So harmful oxygen can be kept away from the conductor material or the nano-particles.
  • the nano-particles may comprise or be carbon nanotubes, in particular also exclusively.
  • the admixed nanoparticles have nano-metal powders, preferably copper, silver or gold. Both different material groups can be used in the second alternative of the manufacturing process. In the first alternative, the admixture of nano-metal particles is particularly suitable.
  • the proportion of nanoparticles or nano-metal particles on the thick-film paste may be, for example, up to 60%, advantageously up to 40% or 50%.
  • the percentages are based on volume percent.
  • a resinate thick-film paste as thick-film paste.
  • the ratio of the highly conductive nano-particles to the other material of the coil which consists mainly of the usual thick-film paste with conductor material, can be increased. This also contributes to the fact that the properties of the finished coil are mainly dominated by the nano-particles.
  • the electrical coil can have any desired shape, as can be produced by a previously described application method, in particular a thick-film method.
  • the shape is favorable for the purpose of use as induction coil, so for example spiral with round or approximately rectangular shape.
  • Fig. 1 is shown in plan view a carrier 11 with an induction coil 12 thereon.
  • They form, for example, a heater for an induction hob. Since such an induction coil, for example, from the aforementioned EP 2120508 A2 is known, need not be discussed further here.
  • Fig. 2 is shown as the induction coil 12 is applied to the carrier 11 by means of a printing screen 14 with illustrated by corresponding hatching pressure areas 15.
  • a thick-layer paste 18 which has been offset by nano-particles, is applied to the printing screen 14 and in particular to the printing areas 15.
  • the result is the in Fig. 2 shown in the middle, the course of the induction coil 12 corresponding shape of a thick-film paste structure 20. Due to the previous admixture of the nano-particles in the thick-film paste 18, they are already fairly homogeneously distributed therein.
  • the thick-film paste 18 is burned in its shape according to the thick-film paste course 20 in a conventional manner, so that on the one hand firmly adheres to the carrier 11 and on the other hand the electrical Ladder for the induction coil 12 and thus the induction coil 12 itself forms. It can clearly be seen that, of course, the volume of the finished induction coil 12 is considerably less than that of the thick-film paste structure 20.
  • the amount of nano-particles remains the same and these are just then present with a certain proportion of the material of the finished induction coil 12, for example as previously mentioned. Due to the limitations mentioned above in screen printing or in other application or printing process their share can only be increased up to a certain point. Thus, the maximum achievable concentration of nano-particles in the finished induction coil 12 is limited.
  • Fig. 3 is a basic embodiment of the invention according to the description shown at the beginning.
  • a thick film paste 18 ' is applied on a support 11 'is in turn by means of a printing screen 14' with printing areas 15 'and an applicator 17' a thick film paste 18 'is applied.
  • it is a pure thick-film paste which contains at least none of the above-described nano-particles.
  • a certain proportion of nano-particles may be provided, possibly even up to a maximum possible saturation, as it was also the case for the previous embodiment in the Fig. 2 is possible.
  • Fig. 3 in the middle is to recognize on the one hand, as appropriate Fig. 2 the thick film paste structure 20 'is present on the carrier 11'.
  • the pure thick-film paste structure 20 ' is on the far right in FIG Fig. 3 Center shown.
  • a further application device 22' To the left is located above the thick-film paste structure 20 ', a further application device 22', with the here also shown as thicker dots nano-particles 23 'are applied to the top of the thick-film paste structure 20'.
  • An application method is For example, spreading, inflation or a previously mentioned fluidized bed process.
  • Fig. 3 Middle can be seen on the far left, is thus on the thick-film paste structure 20 'and its top an accumulation in the manner of a layer of nano-particles 23'.
  • the carrier 11 ' is in turn heated to burn in the thick-film paste 20' and to homogeneously mix with the nano-particles 23 '. These diffuse into the paste material and distribute themselves fairly evenly, preferably completely uniformly.
  • a covering layer mentioned above can be applied. However, this is known and therefore need not be specified.
  • the application of the nano-particles 23 'with the application device 22' on the thick-film paste structure 20 ' is advantageously carried out as soon as possible after printing. Then the thick-film paste structure 20 'is still moist and a maximum of many nano-particles 23' can adhere to the top and thus subsequently also be incorporated into the finished conductor material of the induction coil 12 '.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Parts Printed On Printed Circuit Boards (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer elektrischen Spule sowie eine solche elektrische Spule.The invention relates to a method for producing an electrical coil and such an electrical coil.

Aus der EP 2120508 A2 ist es bekannt, eine Spule bzw. Induktionsspule für eine Induktionsheizeinrichtung dadurch herzustellen, dass eine Dickschichtpaste mit einem hohen Anteil von Carbon-Nanotubes auf einen Träger, beispielsweise aus Keramik, aufgebracht wird. Dies kann beispielsweise durch Drucken erfolgen.From the EP 2120508 A2 It is known to produce a coil or induction coil for an induction heater in that a thick-film paste with a high proportion of carbon nanotubes is applied to a support, for example made of ceramic. This can be done for example by printing.

Aufgabe und LösungTask and solution

Der Erfindung liegt die Aufgabe zugrunde, ein eingangs genanntes Verfahren zur Herstellung einer elektrischen Spule sowie eine damit hergestellte elektrische Spule zu schaffen, mit denen Nachteile des Standes der Technik vermieden werden können und insbesondere ein praxistaugliches sowie serientechnisch gut beherrschbares Verfahren geschaffen werden kann zur Herstellung von solchen Spulen, vorzugsweise von Induktionsspulen.The invention has for its object to provide an aforementioned method for producing an electrical coil and an electric coil produced therewith, with which disadvantages of the prior art can be avoided and in particular a practical and good quality manageable process can be created for the production of such coils, preferably of induction coils.

Gelöst wird diese Aufgabe durch ein Verfahren mit den Merkmalen des Anspruchs 1 sowie eine mit diesem Verfahren hergestellte elektrische Spule mit den Merkmalen des Anspruchs 10. Vorteilhafte sowie bevorzugte Ausgestaltungen der Erfindungen sind Gegenstand der weiteren Ansprüche und werden im Folgenden näher erläutert. Dabei werden manche der Merkmale nur für das Verfahren oder nur für die damit hergestellte elektrische Spule genannt. Sie sollen jedoch unabhängig davon sowohl für das Verfahren als auch für die elektrische Spule gelten können. Der Wortlaut der Ansprüche wird durch ausdrückliche Bezugnahme zum Inhalt der Beschreibung gemacht.This object is achieved by a method having the features of claim 1 and an electric coil produced by this method with the features of claim 10. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. In this case, some of the features are mentioned only for the process or only for the electric coil produced therewith. However, they should apply regardless of both the process and the electric coil. The wording of the claims is incorporated herein by express reference.

Gemäß der Erfindung wird eine an sich übliche Dickschichtpaste, wie sie beispielsweise aus der vorgenannten EP 2120508 A2 bekannt ist, auf den Träger in der gewünschten Geometrie aufgebracht. Sie kann zwar auch Nano-Partikel aufweisen, vorteilhaft aber noch nicht. Nach dem Aufbringen, insbesondere mit nur sehr kurzer zeitlicher Verzögerung bzw. direkt danach, wird die Oberfläche der aufgebrachten Dickschichtpaste mit Nano-Partikeln angereichert. Durch spezielle Art und Dauer des Anreicherungsverfahrens bzw. Aufbringungsverfahrens kann der Anteil der Nano-Partikel beeinflusst werden. Danach wird die Dickschichtpaste mit den aufgebrachten Nano-Partikeln getrocknet und eingebrannt. Beim Einbrennen ergibt sich dann eine homogen durchmischte Schicht, die einen bestimmten Anteil der Nano-Partikel enthält.According to the invention is a conventional thick-film paste, as for example from the aforementioned EP 2120508 A2 is known, applied to the carrier in the desired geometry. Although it can also have nano-particles, but not yet advantageous. After application, in particular with only a very short time delay or directly thereafter, the surface of the applied thick-film paste is enriched with nano-particles. Due to the special nature and duration of the enrichment process or application process, the proportion of nano-particles can be influenced. Thereafter, the thick-film paste with the applied nano-particles is dried and baked. During firing, a homogeneously mixed layer results which contains a certain proportion of the nano-particles.

Durch die Erfindung ist es in beiden Alternativen möglich, den Prozentsatz von Nano-Partikeln in der fertigen Spule zu erhöhen. Grundsätzlich ist es bei der Erfindung möglich und vorteilhaft, die Dickschichtpaste mittels Siebdruck auf den Träger aufzubringen in der gewünschten Form bzw. mit dem gewünschten Verlauf. Dies ist aber nicht unbedingt zwingend, auch andere Druckverfahren, beispielsweise nach Art eines Tintenstrahldruckers, oder andere Verfahren sind möglich.With the invention it is possible in both alternatives to increase the percentage of nano-particles in the finished coil. In principle, it is possible and advantageous in the invention to apply the thick-film paste to the carrier by means of screen printing in the desired form or with the desired course. However, this is not necessarily mandatory, other printing methods, for example in the manner of an inkjet printer, or other methods are possible.

Vorteilhaft werden bei der Erfindung mit dem nachträglichen Aufbringen der Nano-Partikel auf die Oberfläche der Dickschichtpaste die Nano-Partikel in einem Wirbelschichtverfahren auf die Dickschichtpaste bzw. deren Oberfläche aufgebracht zur Anreicherung. Damit können relativ hohe Anteile von Nano-Partikeln an dem fertigen Leitermaterial erreicht werden. Vor allem ist es dadurch auch gut möglich, die Nano-Partikel in einer bestimmten vorgegebenen Dicke auf die Oberfläche aufzubringen. So kann letztlich im fertigen Leitermaterial eine bestimmte vorgegebene Konzentration von Nano-Partikeln im Leitermaterial erreicht werden. Dadurch können auch Probleme von möglicherweise für ein Siebdruck- oder sonstiges Aufbringungsverfahren ungünstigen Viskositäten in der Dickschichtpaste vermieden werden. Bei einem solchen Wirbelschichtverfahren haften die Nano-Partikel an der Oberfläche der Dickschichtpaste an. Deswegen wird dieses Verfahren besonders bevorzugt mit einer noch feuchten Dickschichtpaste durchgeführt, also insbesondere sehr kurz oder sogar direkt nach dem Aufbringen der Dickschichtpaste selbst.Advantageously, in the invention with the subsequent application of the nano-particles to the surface of the thick-film paste, the nano-particles are applied in a fluidized bed process on the thick-film paste or its surface for enrichment. Thus, relatively high levels of nano-particles can be achieved on the finished conductor material. Above all, this also makes it possible to apply the nanoparticles in a certain predetermined thickness on the surface. Thus, a certain predetermined concentration of nano-particles in the conductor material can ultimately be achieved in the finished conductor material. As a result, problems of possibly unfavorable for a screen printing or other application method viscosities in the thick-film paste can be avoided. In such a fluidized bed process, the nano-particles adhere to the surface of the thick-film paste. Therefore, this method is particularly preferably carried out with a still moist thick-film paste, ie in particular very short or even directly after the application of the thick-film paste itself.

Es kann in weiterer Ausgestaltung der Erfindung vorgesehen sein, dass auf die mit Nano-Partikeln angereicherte Oberfläche noch eine zusätzliche Abdeckschicht bzw. Schutzschicht aufgebracht wird. Diese kann vor dem Einbrennen der Dickschichtpaste samt Nano-Partikeln aufgebracht werden und dann verhindern, dass lose Nano-Partikel in die Umgebungsluft gelangen und eine Gesundheitsgefährdung bewirken können. Ebenso kann damit eine Art Fixierung der Nano-Partikel auf der Dickschichtpaste erfolgen, bis diese beim Einbrennen quasi eingebunden und somit fixiert werden. Alternativ oder zusätzlich kann nach dem Einbrennen der Nano-Partikel in die Dickschichtpaste eine Abdeckschicht auf quasi den fertigen Leiter bzw. die fertige Spulenstruktur aufgebracht werden. Damit kann ein Schutz gegen Beschädigung von außen erreicht werden, eine elektrische Isolierung sowie ein Schutz gegen Oxidation. So kann schädlicher Sauerstoff von dem Leitermaterial bzw. den Nano-Partikeln ferngehalten werden.It can be provided in a further embodiment of the invention that an additional covering layer or protective layer is applied to the surface enriched with nano-particles. This can be applied before baking the thick-film paste including nano-particles and then prevent loose nano-particles from entering the surrounding air and causing a health hazard. Likewise, this allows a kind of fixation of the nano-particles on the thick-film paste, until they are quasi integrated during firing and thus fixed. Alternatively or additionally, after the nano-particles have been burnt into the thick-film paste, a covering layer can be applied to the finished conductor or the finished coil structure. This provides protection against external damage, electrical insulation and protection against oxidation. So harmful oxygen can be kept away from the conductor material or the nano-particles.

In weiterer Ausgestaltung der Erfindung können die Nano-Partikel Carbon-Nanotubes aufweisen oder sein, insbesondere auch ausschließlich.In a further embodiment of the invention, the nano-particles may comprise or be carbon nanotubes, in particular also exclusively.

Alternativ weisen die beigemischten Nano-Partikel Nano-Metall-Pulver auf, vorzugsweise Kupfer, Silber oder Gold. Beide unterschiedlichen Materialgruppen können bei der zweiten Alternative des Herstellungsverfahrens verwendet werden. Bei der ersten Alternative bietet sich insbesondere die Beimischung von Nano-Metall-Partikeln an.Alternatively, the admixed nanoparticles have nano-metal powders, preferably copper, silver or gold. Both different material groups can be used in the second alternative of the manufacturing process. In the first alternative, the admixture of nano-metal particles is particularly suitable.

Der Anteil der Nano-Partikel bzw. Nano-Metall-Partikel an der Dickschichtpaste kann beispielsweise bis zu 60% betragen, vorteilhaft sind es bis zu 40% oder 50%. Die Prozentangaben sind dabei auf Volumenprozent bezogen. Somit überwiegen bei der fertigen Spule ganz eindeutig die elektrischen Eigenschaften der Nano-Partikel. Auch niedrigere Anteile von 20% bis 30% können ausreichen.The proportion of nanoparticles or nano-metal particles on the thick-film paste may be, for example, up to 60%, advantageously up to 40% or 50%. The percentages are based on volume percent. Thus, in the finished coil clearly outweigh the electrical properties of the nano-particles. Even lower shares of 20% to 30% may suffice.

In weiterer Ausgestaltung der Erfindung ist es möglich, eine Resinat-Dickschichtpaste als Dickschichtpaste zu verwenden. So kann das Verhältnis der hochleitfähigen Nano-Partikel zum sonstigen Material der Spule, das hauptsächlich aus der üblichen Dickschichtpaste mit Leitermaterial besteht, erhöht werden. Auch dies trägt dazu bei, dass die Eigenschaften der fertigen Spule vor allem von den Nano-Partikeln dominiert werden.In a further embodiment of the invention, it is possible to use a resinate thick-film paste as thick-film paste. Thus, the ratio of the highly conductive nano-particles to the other material of the coil, which consists mainly of the usual thick-film paste with conductor material, can be increased. This also contributes to the fact that the properties of the finished coil are mainly dominated by the nano-particles.

Zum Einbrennen der Dickschichtpaste mit den Nano-Partikeln kann entweder ein rein thermisches Verfahren verwendet werden. Unter Umständen kann noch eine Unterstützung durch Bestrahlung mit UV-Licht erfolgen.For firing the thick-film paste with the nano-particles either a purely thermal process can be used. Under certain circumstances, support can still be provided by irradiation with UV light.

Die elektrische Spule kann grundsätzlich eine beliebige Form aufweisen, wie sie mit einem vorbeschriebenen Aufbringungsverfahren, insbesondere einem Dickschichtverfahren, hergestellt werden kann. Vorteilhaft ist die Form günstig für den Verwendungszweck als Induktionsspule, also beispielsweise spiralig mit runder oder angenähert rechteckiger Form.In principle, the electrical coil can have any desired shape, as can be produced by a previously described application method, in particular a thick-film method. Advantageously, the shape is favorable for the purpose of use as induction coil, so for example spiral with round or approximately rectangular shape.

Kurzbeschreibung der ZeichnungenBrief description of the drawings

Ausführungsbeispiele der Erfindung sind in den Zeichnungen schematisch dargestellt und werden im Folgenden näher erläutert. In den Figuren zeigen:

Fig. 1
eine Draufsicht auf eine fertige elektrische Spule als Induktionsspule für eine Induktionsheizeinrichtung mit spiraliger Form auf einem Träger,
Fig. 2
in mehreren Schritten ein Herstellungsverfahren einer Spule die nicht der Erfindung gehört mit Beimischung von Nano-Partikeln in die Dickschichtpaste und
Fig. 3
in mehreren Schritten das Herstellungsverfahren gemäß der Erfindung mit nachträglichem Aufbringen der Nano-Partikel auf eine aufgedruckte Struktur aus Dickschichtpaste.
Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. In the figures show:
Fig. 1
a top view of a finished electrical coil as an induction coil for an induction heater with a spiral shape on a support,
Fig. 2
in several steps a manufacturing process of a coil which does not belong to the invention with the addition of nano-particles in the thick-film paste and
Fig. 3
in several steps, the manufacturing method according to the invention with subsequent application of the nanoparticles on a printed thick-film paste structure.

Detaillierte Beschreibung der AusführungsbeispieleDetailed description of the embodiments

In Fig. 1 ist in Draufsicht ein Träger 11 mit einer Induktionsspule 12 darauf dargestellt. Sie bilden beispielsweise eine Heizeinrichtung für ein Induktionskochfeld. Da eine solche Induktionsspule beispielsweise aus der eingangs genannten EP 2120508 A2 bekannt ist, braucht hierauf nicht näher eingegangen zu werden.In Fig. 1 is shown in plan view a carrier 11 with an induction coil 12 thereon. They form, for example, a heater for an induction hob. Since such an induction coil, for example, from the aforementioned EP 2120508 A2 is known, need not be discussed further here.

In Fig. 2 ist dargestellt, wie auf den Träger 11 mittels eines Drucksiebes 14 mit durch entsprechende Schraffur verdeutlichten Druckbereichen 15 die Induktionsspule 12 aufgebracht wird. Dazu wird mittels einer Auftragvorrichtung 17, wie sie für Siebdruckverfahren üblich ist, eine mit durch Punktierung dargestellten Nano-Partikeln versetzte Dickschichtpaste 18 auf das Drucksieb 14 und insbesondere die Druckbereiche 15 aufgebracht. Als Resultat entsteht die in Fig. 2 in der Mitte dargestellte, dem Verlauf der Induktionsspule 12 entsprechende Form einer Dickschichtpastenstruktur 20. Aufgrund der vorherigen Beimischung der Nano-Partikel in die Dickschichtpaste 18 sind sie bereits einigermaßen homogen darin verteilt.In Fig. 2 is shown as the induction coil 12 is applied to the carrier 11 by means of a printing screen 14 with illustrated by corresponding hatching pressure areas 15. For this purpose, by means of an applicator 17, as is customary for screen printing, a thick-layer paste 18, which has been offset by nano-particles, is applied to the printing screen 14 and in particular to the printing areas 15. The result is the in Fig. 2 shown in the middle, the course of the induction coil 12 corresponding shape of a thick-film paste structure 20. Due to the previous admixture of the nano-particles in the thick-film paste 18, they are already fairly homogeneously distributed therein.

In einem weiteren Schritt entsprechend Fig. 2 unten wird die Dickschichtpaste 18 in ihrer Form entsprechend dem Dickschichtpastenverlauf 20 auf an sich übliche Art und Weise eingebrannt, so dass sie einerseits auf dem Träger 11 fest haftet und andererseits den elektrischen Leiter für die Induktionsspule 12 und somit die Induktionsspule 12 selbst bildet. Deutlich ist zu erkennen, dass natürlich das Volumen der fertigen Induktionsspule 12 erheblich geringer ist als dasjenige der Dickschichtpastenstruktur 20.In a further step accordingly Fig. 2 below the thick-film paste 18 is burned in its shape according to the thick-film paste course 20 in a conventional manner, so that on the one hand firmly adheres to the carrier 11 and on the other hand the electrical Ladder for the induction coil 12 and thus the induction coil 12 itself forms. It can clearly be seen that, of course, the volume of the finished induction coil 12 is considerably less than that of the thick-film paste structure 20.

Die Menge an Nano-Partikeln bleibt gleich und diese liegen dann eben mit einem bestimmten Anteil an dem Material der fertigen Induktionsspule 12 vor, beispielsweise wie zuvor genannt. Durch die eingangs genannten Beschränkungen bei Siebdruckverfahren oder auch bei anderen Aufbringungs- bzw. Druckverfahren kann ihr Anteil nur bis zu einem bestimmten Punkt erhöht werden. So ist auch die maximal erreichbare Konzentration von Nano-Partikeln in der fertigen Induktionsspule 12 begrenzt.The amount of nano-particles remains the same and these are just then present with a certain proportion of the material of the finished induction coil 12, for example as previously mentioned. Due to the limitations mentioned above in screen printing or in other application or printing process their share can only be increased up to a certain point. Thus, the maximum achievable concentration of nano-particles in the finished induction coil 12 is limited.

In Fig. 3 ist eine grundsätzliche Ausgestaltung der Erfindung gemäß der Beschreibung am Anfang dargestellt. Auf einen Träger 11' wird wiederum mittels eines Drucksiebs 14' mit Druckbereichen 15' und einer Auftragvorrichtung 17' eine Dickschichtpaste 18' aufgebracht. In diesem Fall ist es gemäß einer Möglichkeit eine reine Dickschichtpaste, welche zumindest keine der vorbeschriebenen Nano-Partikel enthält. Gemäß einer anderen Möglichkeit der Erfindung kann ein gewisser Anteil an Nano-Partikeln vorgesehen sein, unter Umständen sogar bis zu einer maximal möglichen Sättigung, wie es auch für das vorherige Ausführungsbeispiel in der Fig. 2 möglich ist.In Fig. 3 is a basic embodiment of the invention according to the description shown at the beginning. On a support 11 'is in turn by means of a printing screen 14' with printing areas 15 'and an applicator 17' a thick film paste 18 'is applied. In this case, according to one possibility, it is a pure thick-film paste which contains at least none of the above-described nano-particles. According to another possibility of the invention, a certain proportion of nano-particles may be provided, possibly even up to a maximum possible saturation, as it was also the case for the previous embodiment in the Fig. 2 is possible.

In Fig. 3 in der Mitte ist zum einen zu erkennen, wie entsprechend Fig. 2 die Dickschichtpastenstruktur 20' auf dem Träger 11' vorhanden ist. Die reine Dickschichtpastenstruktur 20' ist ganz rechts in Fig. 3 Mitte dargestellt. Links daneben befindet sich über der Dickschichtpastenstruktur 20' eine weitere Auftragvorrichtung 22', mit der hier ebenfalls als dickere Punkte dargestellte Nano-Partikel 23' auf die Oberseite der Dickschichtpastenstruktur 20' aufgebracht werden. Ein Aufbringungsverfahren ist beispielsweise Aufstreuen, Aufblasen oder ein zuvor genanntes Wirbelschichtverfahren. Wie in Fig. 3 Mitte ganz links zu sehen ist, findet sich somit auf der Dickschichtpastenstruktur 20' bzw. ihrer Oberseite eine Ansammlung nach Art einer Schicht von Nano-Partikeln 23'.In Fig. 3 in the middle is to recognize on the one hand, as appropriate Fig. 2 the thick film paste structure 20 'is present on the carrier 11'. The pure thick-film paste structure 20 'is on the far right in FIG Fig. 3 Center shown. To the left is located above the thick-film paste structure 20 ', a further application device 22', with the here also shown as thicker dots nano-particles 23 'are applied to the top of the thick-film paste structure 20'. An application method is For example, spreading, inflation or a previously mentioned fluidized bed process. As in Fig. 3 Middle can be seen on the far left, is thus on the thick-film paste structure 20 'and its top an accumulation in the manner of a layer of nano-particles 23'.

Nach dem Aufbringen der Nano-Partikel, was unter Umständen auch in mehreren Durchläufen erfolgen kann, wird der Träger 11' wiederum erhitzt zum Einbrennen der Dickschichtpaste 20' und zur homogenen Vermischung mit den Nano-Partikeln 23'. Diese diffundieren dabei in das Pastenmaterial ein und verteilen sich darin einigermaßen gleichmäßig, vorzugsweise vollständig gleichmäßig.After the application of the nano-particles, which under certain circumstances can take place in several passes, the carrier 11 'is in turn heated to burn in the thick-film paste 20' and to homogeneously mix with the nano-particles 23 '. These diffuse into the paste material and distribute themselves fairly evenly, preferably completely uniformly.

Entweder nach dem Einbrennen der Dickschichtpaste 20' zur Induktionsspule 12' oder sogar noch davor, also nach dem Aufbringen der Nano-Partikel 23' mit der Auftragvorrichtung 22', kann eine eingangs genannte Abdeckschicht aufgebracht werden. Dies ist aber bekannt und braucht deswegen nicht näher dargelegt zu werden.Either after baking the thick-film paste 20 'to the induction coil 12' or even before, ie after the application of the nano-particles 23 'with the applicator 22', a covering layer mentioned above can be applied. However, this is known and therefore need not be specified.

Das Aufbringen der Nano-Partikel 23' mit der Auftragvorrichtung 22' auf die Dickschichtpastenstruktur 20' erfolgt vorteilhaft möglichst bald nach dem Bedrucken. Dann ist die Dickschichtpastenstruktur 20' noch feucht und maximal viele Nano-Partikel 23' können auf der Oberseite anhaften und somit anschließend auch in das fertige Leitermaterial der Induktionsspule 12' eingebunden werden.The application of the nano-particles 23 'with the application device 22' on the thick-film paste structure 20 'is advantageously carried out as soon as possible after printing. Then the thick-film paste structure 20 'is still moist and a maximum of many nano-particles 23' can adhere to the top and thus subsequently also be incorporated into the finished conductor material of the induction coil 12 '.

Claims (10)

  1. Method for producing an electrical coil, in particular an induction coil (12, 12'), for electric cooking by means of inductive heating, wherein a thick-film paste is applied to a support (11') having the desired geometry for the coil (12, 12'), characterized in that a per se conventional thick-film paste (18') is applied to the support (11') in the desired geometry, and after application the surface is enriched with nanoparticles (23'), and subsequently is dried and cured.
  2. Method according to claim 1, characterized in that the thick-film paste (18') is applied to the support (11') by means of screen printing.
  3. Method according to claim 1 or 2, characterized in that the nanoparticles (23') for enrichment of the surface are applied to the thick-film paste (18') using a fluidised-bed procedure.
  4. Method according to any one of the preceding claims, characterized in that enrichment of the surface of the applied thick-film paste (18') is performed while said surface is still wet.
  5. Method according to any one of the preceding claims, characterized in that onto the surface enriched with nanoparticles (23') an additional cover layer is applied for protection against exterior oxidation or damaging.
  6. Method according to any one of the preceding claims, characterized in that the admixed nanoparticles (23') are carbon nanotubes.
  7. Method according to any one of the claims 1 to 5, characterized in that the admixed nanoparticles (23') are metallic nanoparticles, the admixed metallic nanoparticles preferably comprising the following group of metals: copper, silver, gold.
  8. Method according to any one of the preceding claims, characterized in that the nanoparticles (23') or metallic nanoparticles are admixed to the thick-film paste in a proportion of up to 60 %, in particular of up to 40 % or 50 %.
  9. Method according to any one of the preceding claims, characterized in that a resinate based thick-film paste is used for the thick-film paste (18') to increase the ratio of high-conductive nanoparticles (23') to the proportion of thick-film paste material remaining after curing.
  10. Electric coil (12, 12'), in particular induction coil, characterized in that the coil has been produced using a method according to any one of the preceding claims.
EP12702030.3A 2011-02-01 2012-02-01 Method for producing an electrical coil and electrical coil Not-in-force EP2671425B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011003463A DE102011003463A1 (en) 2011-02-01 2011-02-01 Method for producing an electric coil and electric coil
PCT/EP2012/051617 WO2012104327A1 (en) 2011-02-01 2012-02-01 Method for producing an electrical coil and electrical coil

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EP2671425A1 EP2671425A1 (en) 2013-12-11
EP2671425B1 true EP2671425B1 (en) 2015-07-01

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ITTO20120896A1 (en) 2012-10-15 2014-04-16 Indesit Co Spa INDUCTION HOB
US10605464B2 (en) 2012-10-15 2020-03-31 Whirlpool Corporation Induction cooktop
DE102012220022B4 (en) * 2012-11-02 2014-09-25 Festo Ag & Co. Kg Method of manufacturing a coil and electronic device
EP3432682A1 (en) 2017-07-18 2019-01-23 Whirlpool Corporation Method for operating an induction cooking hob and cooking hob using such method
US10993292B2 (en) 2017-10-23 2021-04-27 Whirlpool Corporation System and method for tuning an induction circuit
CN109757001A (en) * 2017-11-08 2019-05-14 佛山市顺德区美的电热电器制造有限公司 Coil panel component and cooking apparatus
US11140751B2 (en) 2018-04-23 2021-10-05 Whirlpool Corporation System and method for controlling quasi-resonant induction heating devices

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CN1141250C (en) * 2001-05-25 2004-03-10 清华大学 Process and reactor for continuously preparing nm carbon tubes with fluidized bed
JP2003109732A (en) * 2001-09-27 2003-04-11 Seiji Motojima Heating element equipped with coiled carbon fiber and coiled carbon fiber for use with same as well as uses
TWI289488B (en) * 2003-10-20 2007-11-11 Harima Chemicals Inc Fine metal particles, fine metal oxide particles in the form of dried-up powder, and use of the same
US20100315191A1 (en) * 2005-10-13 2010-12-16 Xiao T Danny Patterned magnetic inductors
US20080174397A1 (en) * 2007-01-19 2008-07-24 General Electric Company High quality factor, low volume, air-core inductor
DE102008024888A1 (en) 2008-05-16 2009-11-26 E.G.O. Elektro-Gerätebau GmbH Induction heater and method of manufacturing an induction heater

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EP2671425A1 (en) 2013-12-11
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