WO2020069687A1 - Magnetic field-reducing flat heating element for a motor vehicle - Google Patents

Magnetic field-reducing flat heating element for a motor vehicle

Info

Publication number
WO2020069687A1
WO2020069687A1 PCT/DE2019/000243 DE2019000243W WO2020069687A1 WO 2020069687 A1 WO2020069687 A1 WO 2020069687A1 DE 2019000243 W DE2019000243 W DE 2019000243W WO 2020069687 A1 WO2020069687 A1 WO 2020069687A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating conductor
heating
magnetic field
conductor
reducing surface
Prior art date
Application number
PCT/DE2019/000243
Other languages
German (de)
French (fr)
Inventor
Jochen Michelmann
Original Assignee
I.G. Bauerhin Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102018007753.6A external-priority patent/DE102018007753A1/en
Priority claimed from DE202018004633.7U external-priority patent/DE202018004633U1/en
Application filed by I.G. Bauerhin Gmbh filed Critical I.G. Bauerhin Gmbh
Priority to DE112019005000.1T priority Critical patent/DE112019005000A5/en
Priority to EP19794084.4A priority patent/EP3861831A1/en
Publication of WO2020069687A1 publication Critical patent/WO2020069687A1/en

Links

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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • 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
    • H05B3/00—Ohmic-resistance heating
    • H05B3/40—Heating elements having the shape of rods or tubes
    • H05B3/54—Heating elements having the shape of rods or tubes flexible
    • H05B3/56—Heating cables
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/002—Heaters using a particular layout for the resistive material or resistive elements
    • H05B2203/004—Heaters using a particular layout for the resistive material or resistive elements using zigzag layout
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/017—Manufacturing methods or apparatus for heaters
    • 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
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/029—Heaters specially adapted for seat warmers

Definitions

  • Surface heating elements are used for even and effective heating of surfaces.
  • Surface heating elements are used in motor vehicles in particular as seat heaters in order to increase driving comfort for a vehicle occupant and to impart a pleasant driving experience to the latter, for example, at low outside temperatures.
  • the requirements of vehicle manufacturers for the design of surface heating elements are constantly growing.
  • the 1994 ICNIRP directive requires compliance with limit values that can be caused by exposure to time-varying electrical, magnetic and electromagnetic fields (up to 300 GHz).
  • DE 296 10 436 U1 describes, for example, a magnetic field-free heating pad which has two conductor parts through which current flows in opposite or opposite directions to reduce the magnetic field, either in series or in parallel.
  • the heating conductor comprises a relief strand on which the metallic conductor is arranged on the relief strand in a meandering manner - in particular spirally wrapping around the relief strand.
  • the metallic conductor itself has a plurality of conductor strands, in particular connected in parallel to one another, which are electrically insulated from one another.
  • DE 10 2012 219 578 B4 further discloses a fiber-laying machine for simultaneously laying and sewing at least two fiber strands, in particular ribbon-shaped fiber strands, onto a flat carrier material.
  • the fiber strands are fed for each fiber strand via a separate guide tube, each of which ends at a feed device.
  • the present invention is based on the object of creating a magnetic field-reducing surface heating element for heating a vehicle seat which is improved compared to the known prior art, and a corresponding method for its production.
  • the magnetic field-reducing surface heating element according to the present invention can be used in particular in a motor vehicle and comprises at least one heating conductor strand.
  • the at least one heating conductor strand comprises at least one first heating conductor, each with at least three filaments, each of which is insulated from one another by means of an enveloping lacquer layer and wound spirally around a core.
  • the first heating conductor further comprises an outer jacket.
  • the heating conductor strand further comprises a covering, at least in sections, on the jacket of the first heating conductor. stirring second heating conductor, which apart from a layer of lacquer around at least one filament is free of insulation.
  • the second heating conductor has no insulating sheathing, that is to say no insulation that surrounds the filaments together.
  • Such a configuration allows the heating conductor strand to be made thin, as a result of which the resulting surface heating element can be made flatter overall.
  • less material is required due to the omission of a sheathing, as a result of which the manufacturing process of the heating conductor strand can be carried out overall more cost-effectively and more quickly.
  • the second jacket-free heating conductor is insulated by the second heating conductor contacting the insulating jacket of the first heating conductor at least in sections.
  • the second heating conductor is expediently free of a core.
  • the filaments of the second heating conductor are then preferably twisted together.
  • the second heating conductor also comprises a core.
  • the filaments of the second heating conductor are expediently also wound spirally around the core.
  • a plurality of the filaments - optionally each filament - of the second heating conductor is provided with a lacquer layer enveloping them.
  • a common outer sheathing of the filaments of the second heating conductor is also not necessary in this case.
  • the first heat conductor and the second heat conductor of the heat conductor strand can preferably be energized in opposite directions. If both heating conductors are energized in opposite directions with the same amount of current, the magnetic fields generated by the current flows are extinguished and, ideally, a magnetic field strength of (almost) zero results. In this way, the requirement for predetermined low limit values is taken into account.
  • the two heating conductors can be energized in opposite directions with, for example, 12 V direct current.
  • first heating conductor and the second heating conductor can be energized separately from one another.
  • the heating conductors are therefore energized in parallel to one another via two connection points per heating conductor.
  • the first heating conductor and the second heating conductor are preferably connected in series and, for this purpose, electrically connected to one another at one of their ends.
  • An alternative embodiment further provides that the filaments of the first heating conductor are wound in the opposite direction around its core.
  • the filaments form a double helix-like structure surrounding the core, which increases the tensile strength and the stability of the heating conductor.
  • the second heating conductor is also formed with a core, it is advantageous if the filaments of the second heating conductor are also wound in a spiral in opposite directions around its core.
  • the heating conductor strand formed by the first heating conductor and the second heating conductor is expediently arranged on a carrier material.
  • Flexible materials such as textiles, knitted fabrics or woven fabrics are particularly suitable as carrier materials.
  • a nonwoven is particularly preferably used as the carrier material.
  • the at least one heating conductor strand is preferably sewn or embroidered onto the carrier material. Another advantage is that the at least one heating conductor strand is arranged between two layers of a carrier material.
  • the holding device thus represents a common presentation or retention device for both heating conductors to be arranged on the carrier material.
  • the heating conductors are fed to the carrier material from this receiving device jointly and in particular simultaneously.
  • a supply spool is preferably used as the receiving device, on which the heating conductors are rolled up or wound up.
  • the at least two heating conductors are preferably twisted together before being applied to the carrier material.
  • the two heating conductors are already twisted together on the receiving device to form a heating conductor strand.
  • a heating conductor strand consisting of two twisted heating conductors is preferably provided by the receiving device.
  • the two heating conductor strands are only twisted together after the removal or provision by the common receiving device, with the heating conductor strand being formed.
  • the two heating conductors are preferably arranged next to one another on a rotating receiving device, that is to say, for example, on a one-part or a multi-part supply spool and are unwound together from this.
  • the rotation of the holding device during the unwinding of the heating conductors causes them to be twisted together before being applied to the carrier material.
  • the two heating conductors are expediently fastened to the carrier material by a thread guided in a zigzag stitch.
  • FIG. 1 shows a top view of a magnetic field-reducing surface heating element according to the invention with a heating conductor strand applied to a carrier material
  • FIG. 2 shows a cross section through the heating conductor strand according to FIG. 1,
  • Figure 2.1 shows a cross section through a further heat conductor strand
  • FIG. 1 shows a top view of a magnetic field-reducing surface heating element 1 according to the invention in a schematic illustration.
  • the surface heating element 1 comprises a fleece 2 as the carrier material 3, on which a heating conductor strand 4 is applied in a wave shape. As a result, the heating conductor strand 4 spans a heating surface 5.
  • the heating conductor strand 4 is formed from two heating conductors 7, 8, which are twisted together. According to the present illustration, the heating conductors 7, 8 are acted upon separately in opposite directions, for example with 12 V direct current. The heating conductors 7, 8 are thus energized in parallel with one another via two contact points 9, 10 (indicated by dashed arrows) per heating conductor 7, 8. The opposite energization of the heating conductors 7, 8 with currents of the same amount creates a surface heating element 1, the resulting magnetic field of which is below specified limit values and thus does not represent a health hazard for the user.
  • both heating conductors 7, 8 each comprise three conductive filaments 11.
  • the filaments 11 of the first heating conductor 7 are arranged in a spiral around a high-tensile core 12 made of non-conductive multifilaments 13.
  • the second heating conductor 8 has no core in the present case.
  • the filaments 11 of the second heating conductor 8 are twisted here. The spiral winding of the filaments 11 around the core 12 of the first heating conductor 7 and the twisting of the filaments 11 of the second heating conductor 8 cannot be seen on the basis of the sectional illustration.
  • the filaments 11 of the first heating conductor 7 are each provided with an enveloping lacquer layer 14 and thereby insulated from one another.
  • the first heating conductor 7 comprises an outer jacket 15 made of an insulating material 16, which coats all the filaments 11 wound around the core 12 together.
  • the second heating conductor 8 has only one filament 11 provided with an enveloping lacquer layer 14. The two remaining filaments 11 are free of a lacquer layer 14.
  • the second heating conductor 8 also has no jacket insulation 15 surrounding the filaments 11. Instead, the second jacket-free heating conductor 8 is insulated by the second heating conductor 8 touching the jacket 15 of the first heating conductor 7 at least in sections. This is achieved in particular by twisting the two heating conductors 7,8 ( ' twisted pair ' heating conductor strand) forming the heating conductor strand 4.
  • FIG. 2.1 An alternative embodiment of the heating conductor 4 with the two heating conductor strands 7, 8 can be seen in FIG. 2.1.
  • the second heating conductor 8 here also comprises a high-tensile core 12 made of non-conductive multifilaments 13, around which the filaments 11 of the second heating conductor 8 are wound in a spiral.
  • the remaining structure of the heating conductors 7, 8 can be transferred from FIG. 2 to the heating conductors 7, 8 shown in FIG. 2.1.
  • FIG. 3 shows a partial area of an embroidery device 17 for producing a magnetic field-reducing heating element 1 by means of the method according to the invention.
  • the carrier material 3 is presented and then the heating conductor 7,
  • the two heating conductors 7, 8 are received in the form of the already twisted heating conductor strand 4 by a common receiving device 18.
  • the receiving device 18 is designed here as a one-piece supply spool 19, on which the twisted heat conductor strand 4 is wound.
  • the heating conductor strand 4 is placed on the carrier material 3 by means of a feed 20 arranged on the supply spool 19, in the present case in the form of a tube, and is attached to the base material 3 and then with a seam 23 in a zigzag stitch the carrier material 3 is embroidered.
  • the receiving device 18 represents a common presentation or retention device for the respective heating conductors.

Landscapes

  • Resistance Heating (AREA)

Abstract

The invention relates to a magnetic field-reducing flat heating element (1) for a motor vehicle, comprising at least one heating conductor strand (4) which comprises at least one first heating conductor (7) with at least three filaments (11) which are respectively insulated from one another by means of an enveloping coating layer (14) and are wound in a helical manner around a core (12), wherein the first heating conductor (7) comprises an outer casing (15), characterized in that the heating conductor strand (4) comprises a second heating conductor (8) which makes contact with the outer casing (15) of the first heating conductor (7) at least in sections and which is free of insulation apart from a coating layer (14) around at least one filament (11).

Description

Beschreibung  description
Magnetfeldreduzierendes Flächenheizelement für ein Kraftfahrzeug Magnetic field reducing surface heating element for a motor vehicle
Die vorliegende Erfindung betrifft ein magnetfeldreduzierendes Flächenheizelement für ein Kraftfahrzeug sowie ein Verfahren zur Herstellung eines magnetfeldreduzie- renden Flächenheizelements. The present invention relates to a magnetic field-reducing surface heating element for a motor vehicle and a method for producing a magnetic field-reducing surface heating element.
Flächenheizelemente werden zur gleichmäßigen und effektiven Beheizung von Flä- chen eingesetzt. In Kraftfahrzeugen finden Flächenheizelemente insbesondere Einsatz als Sitzheizungen, um den Fahrkomfort für einen Fahrzeuginsassen zu erhöhen und diesem beispielsweise bei geringen Außentemperaturen ein angenehmes Fahr- gefühl zu vermitteln. Die Anforderungen der Fahrzeughersteller an die Gestaltung von Flächenheizelementen wachsen hierbei stetig. Surface heating elements are used for even and effective heating of surfaces. Surface heating elements are used in motor vehicles in particular as seat heaters in order to increase driving comfort for a vehicle occupant and to impart a pleasant driving experience to the latter, for example, at low outside temperatures. The requirements of vehicle manufacturers for the design of surface heating elements are constantly growing.
Hierbei gilt es mögliche Gesundheitsbeeinträchtigungen von Fahrzeuginsassen zu berücksichtigen. So fordert die ICNIRP-Richtlinie aus dem Jahre 1994 die Einhaltung von Grenzwerten, die durch die Exposition durch zeitlich veränderliche elektrische, magnetische und elektromagnetische Felder (bis 300 GHz) hervorgerufen werden können. It is important to take into account possible health impairments of vehicle occupants. The 1994 ICNIRP directive, for example, requires compliance with limit values that can be caused by exposure to time-varying electrical, magnetic and electromagnetic fields (up to 300 GHz).
Die DE 296 10 436 U1 beschreibt hierzu beispielsweise ein magnetfeldfreies Heiz- kissen, welches zwei Leiterteile aufweist, die zur Magnetfeldreduktion entweder in Serie oder parallel geschaltet gegenläufig von Strom durchflossen werden. DE 296 10 436 U1 describes, for example, a magnetic field-free heating pad which has two conductor parts through which current flows in opposite or opposite directions to reduce the magnetic field, either in series or in parallel.
Aus der DE 103 09 207 A1 ist ein Heizleiter mit einem metallischen Leiter und einer diesen zumindest teilweise umhüllenden Ummantelung aus Kunststoff bekannt. Gemäß einer Ausführungsform umfasst der Heizleiter einen Entlastungsstrang, an wel- chem der metallische Leiter mäandernd - insbesondere den Entlastungsstrang spiralförmig umwindend - am Entlastungsstrang angeordnet ist. Der metallische Leiter selbst weist mehrere, insbesondere parallel zu einander geschaltete Leiterstränge auf, welche gegeneinander elektrisch isoliert sind. DE 103 09 207 A1 discloses a heat conductor with a metallic conductor and a plastic sheath at least partially enveloping it. According to one embodiment, the heating conductor comprises a relief strand on which the metallic conductor is arranged on the relief strand in a meandering manner - in particular spirally wrapping around the relief strand. The metallic conductor itself has a plurality of conductor strands, in particular connected in parallel to one another, which are electrically insulated from one another.
BESTATIGUNGSKOPIE Weiter offenbart die EP 1 705 957 B1 einen elektrischen Heizleiter mit wenigstens einem elektrisch leitfähigen, aus Filamenten gebildeten Innenstrang und wenigstens einem elektrisch leitfähigen, um den Innenstrang gewundenen und ebenfalls aus Filamenten bestehenden Außenstrang. Der Innenstrang ist gegenüber dem Au- ßenstrang wenigstens abschnittsweise isoliert. Die Isolation erfolgt mittels einer die Filamente des Außenstranges zumindest teilweise umgebenden Lackschicht. CONFIRMATION COPY Furthermore, EP 1 705 957 B1 discloses an electrical heating conductor with at least one electrically conductive inner strand formed from filaments and at least one electrically conductive outer strand wound around the inner strand and likewise consisting of filaments. The inner strand is at least partially insulated from the outer strand. The insulation takes place by means of a lacquer layer at least partially surrounding the filaments of the outer strand.
Die DE 10 2012 219 578 B4 offenbart weiter eine Faseriegemaschine zum gleichzei- tigen Verlegen und Vernähen mindestens zweier Faserstränge insbesondere band- förmiger Faserstränge auf ein flächiges Trägermaterial. Die Zuführung der Faser- stränge erfolgt hierbei für jeden Faserstrang über einen separaten Führungs- schlauch, die jeweils an einer Zuführungsvorrichtung enden. DE 10 2012 219 578 B4 further discloses a fiber-laying machine for simultaneously laying and sewing at least two fiber strands, in particular ribbon-shaped fiber strands, onto a flat carrier material. The fiber strands are fed for each fiber strand via a separate guide tube, each of which ends at a feed device.
Der vorliegenden Erfindung liegt nun die Aufgabe zugrunde, ein gegenüber dem be- kannten Stand der Technik verbessertes magnetfeldreduzierendes Flächenheizele- ment zur Beheizung eines Fahrzeugsitzes sowie eine entsprechendes Verfahren zu dessen Herstellung zu schaffen. The present invention is based on the object of creating a magnetic field-reducing surface heating element for heating a vehicle seat which is improved compared to the known prior art, and a corresponding method for its production.
Gelöst wird diese Aufgabe durch ein magnetfeldreduzierendes Flächenheizelement mit den Merkmalen des Anspruchs 1 , sowie durch ein Verfahren mit den Merkmalen des Anspruchs 13. Bevorzugte Ausführungsformen des Flächenheizelementes und des Verfahrens zur Herstellung des Flächenheizelementes sind in den abhängigen Ansprüchen angegeben. This object is achieved by a magnetic field-reducing surface heating element with the features of claim 1 and by a method with the features of claim 13. Preferred embodiments of the surface heating element and the method for producing the surface heating element are specified in the dependent claims.
Das magnetfeldreduzierende Flächenheizelement gemäß der vorliegenden Erfindung ist insbesondere in einem Kraftfahrzeug einsetzbar und umfasst zumindest einen Heizleiterstrang. Der zumindest eine Heizleiterstrang umfasst zumindest einen ersten Heizleiter mit jeweils zumindest drei Filamenten, die jeweils mittels einer umhüllen- den Lackschicht zueinander isoliert und spiralförmig um einen Kern gewickelt sind. Der erste Heizleiter umfasst weiter einen äußeren Mantel. Der Heizleiterstrang um- fasst weiter einen den Mantel des ersten Heizleiters zumindest abschnittsweise be- rührenden zweiten Heizleiter, der außer einer Lackschicht um zumindest ein Fila- ment frei von einer Isolierung ist. The magnetic field-reducing surface heating element according to the present invention can be used in particular in a motor vehicle and comprises at least one heating conductor strand. The at least one heating conductor strand comprises at least one first heating conductor, each with at least three filaments, each of which is insulated from one another by means of an enveloping lacquer layer and wound spirally around a core. The first heating conductor further comprises an outer jacket. The heating conductor strand further comprises a covering, at least in sections, on the jacket of the first heating conductor. stirring second heating conductor, which apart from a layer of lacquer around at least one filament is free of insulation.
Mit anderen Worten weist der zweite Heizleiter keine isolierende Ummantelung, also keine die Filamente gemeinsam umgebende Isolierung, auf. Eine solche Ausgestal- tung erlaubt eine dünne Herstellung des Heizleiterstranges, wodurch das resultieren- de Flächenheizelement insgesamt flacher ausgestaltet werden kann. Zusätzlich wird aufgrund des Verzichtes einer Ummantelung weniger Material benötigt, wodurch der Herstellungsprozess des Heizleiterstranges insgesamt kostengünstiger und schneller durchführbar ist. Eine Isolierung des zweiten mantelfreien Heizleiters erfolgt durch den zumindest abschnittsweisen Kontakt des zweiten Heizleiters mit der isolierenden Ummantelung des ersten Heizleiters. In other words, the second heating conductor has no insulating sheathing, that is to say no insulation that surrounds the filaments together. Such a configuration allows the heating conductor strand to be made thin, as a result of which the resulting surface heating element can be made flatter overall. In addition, less material is required due to the omission of a sheathing, as a result of which the manufacturing process of the heating conductor strand can be carried out overall more cost-effectively and more quickly. The second jacket-free heating conductor is insulated by the second heating conductor contacting the insulating jacket of the first heating conductor at least in sections.
Der zweite Heizleiter ist zweckmäßigerweise frei von einem Kern. Die Filamente des zweiten Heizleiters sind dann vorzugsweise miteinander verdrillt. Alternativ ist es im Rahmen der Erfindung grundsätzlich möglich, dass auch der zweite Heizleiter einen Kern umfasst. In diesem Fall sind die Filamente des zweiten Heizleiters zweckmäßi- gerweise ebenfalls spiralförmig um den Kern gewickelt sind. The second heating conductor is expediently free of a core. The filaments of the second heating conductor are then preferably twisted together. Alternatively, it is fundamentally possible within the scope of the invention that the second heating conductor also comprises a core. In this case, the filaments of the second heating conductor are expediently also wound spirally around the core.
In einer vorteilhaften Ausgestaltung der Erfindung ist eine Mehrzahl der Filamente - gegebenenfalls jedes Filament - des zweiten Heizleiters mit einer dieser umhüllen- den Lackschicht versehen. Eine gemeinsame äußere Ummantelung der Filamente des zweiten Heizleiters ist auch in diesem Fall verzichtbar. In an advantageous embodiment of the invention, a plurality of the filaments - optionally each filament - of the second heating conductor is provided with a lacquer layer enveloping them. A common outer sheathing of the filaments of the second heating conductor is also not necessary in this case.
Besonders bevorzugt ist zumindest ein Filament des zweiten Heizleiters als ein Kern- Mantel-Draht ausgebildet. Der Mantel des zumindest einen Filaments des zweiten Heizleiters ist vorzugsweise aus Kupfer oder einer Kupferlegierung gebildet. Der Kern des zumindest einen Filaments des zweiten Heizleiters ist bevorzugt aus einem Stahl, insbesondere aus einem kohlenstoffhaltigen Stahl gebildet. Eine alternative Möglichkeit sieht im Rahmen der Erfindung vor, dass der Mantel des zumindest ei- nen Filaments des zweiten Heizleiters aus einem Stahl, insbesondere aus einem kohlenstoffhaltigen Stahl und der Kern des zumindest einen Filaments des zweiten Heizleiters aus Kupfer oder einer Kupferlegierung gebildet ist. At least one filament of the second heating conductor is particularly preferably designed as a core / sheath wire. The jacket of the at least one filament of the second heating conductor is preferably formed from copper or a copper alloy. The core of the at least one filament of the second heating conductor is preferably formed from a steel, in particular from a carbon-containing steel. An alternative possibility provides in the context of the invention that the jacket of the at least one filament of the second heating conductor is made of a steel, in particular one carbon-containing steel and the core of the at least one filament of the second heating conductor is formed from copper or a copper alloy.
Um bei einem stromdurchflossenen Heizleiterstrang sicherzustellen, dass das resul- tierende Magnetfeld unterhalb vorgegebener Grenzwerte liegt, sind der erste Heizlei- ter und der zweite Heizleiter des Heizleiterstranges vorzugsweise gegenläufig bestrombar. Werden beide Heizleiter gegensinnig mit betragsmäßig gleichen Strö- men bestromt, so löschen sich die durch die Stromflüsse erzeugten Magnetfelder aus und es resultiert im idealen Fall eine magnetische Feldstärke von (nahezu) Null. Auf diese Weise wird der Anforderung an vorgegebene niedrige Grenzwerte Rech- nung getragen. Insbesondere sind die beiden Heizleiter gegenläufig mit beispielswei- se 12 V-Gleichstrom bestrombar. In order to ensure that the resultant magnetic field is below predetermined limit values in the case of a heat conductor strand through which current flows, the first heat conductor and the second heat conductor of the heat conductor strand can preferably be energized in opposite directions. If both heating conductors are energized in opposite directions with the same amount of current, the magnetic fields generated by the current flows are extinguished and, ideally, a magnetic field strength of (almost) zero results. In this way, the requirement for predetermined low limit values is taken into account. In particular, the two heating conductors can be energized in opposite directions with, for example, 12 V direct current.
In einer bevorzugten Ausgestaltung sind der erste Heizleiter und der zweite Heizleiter separat voneinander bestrombar. Die Heizleiter werden also parallel zueinander über jeweils zwei Anschlussstellen pro Heizleiter bestromt. Alternativ bevorzugt sind der erste Heizleiter und der zweite Heizleiter in Reihe geschaltet und hierzu an einem ihrer Enden elektrisch miteinander verbunden. In a preferred embodiment, the first heating conductor and the second heating conductor can be energized separately from one another. The heating conductors are therefore energized in parallel to one another via two connection points per heating conductor. Alternatively, the first heating conductor and the second heating conductor are preferably connected in series and, for this purpose, electrically connected to one another at one of their ends.
Eine alternative Ausgestaltung sieht weiter vor, dass die Filamente des ersten Heizleiters spiralförmig gegenläufig um dessen Kern gewickelt sind. Hierbei bilden die Filamente eine den Kern umgebende doppelhelixartige Struktur aus, die die Zugfes- tigkeit und die Stabilität des Heizleiters erhöht. Ist der zweite Heizleiter ebenfalls mit einem Kern ausgebildet, ist es von Vorteil, wenn die Filamente des zweiten Heizlei- ters ebenfalls spiralförmig gegenläufig um dessen Kern gewickelt sind. An alternative embodiment further provides that the filaments of the first heating conductor are wound in the opposite direction around its core. The filaments form a double helix-like structure surrounding the core, which increases the tensile strength and the stability of the heating conductor. If the second heating conductor is also formed with a core, it is advantageous if the filaments of the second heating conductor are also wound in a spiral in opposite directions around its core.
Vorzugsweise sind der erste Heizleiter und der zweite Heizleiter unter Ausbildung des Heizleiterstranges miteinander verdrillt bzw. verseilt. Hierdurch wird ein soge- nannter 'twisted pair'-Heizleiterstrang ausgebildet, durch welchen sich Beeinflussun- gen durch äußere Felder größtenteils gegenseitig aufheben. Zur Verbesserung der Verlegeeigenschaften sind der erste Heizleiter und der zweite Heizleiter zweckmäßi- gerweise in entgegengesetzten Schlagrichtungen verdrillt. Vorzugweise ist der Kern des ersten Heizleiters aus nichtleitenden Multifilament- Fasern gebildet. Durch den Einsatz eines aus Multifilamenten bestehenden Kernes wird insbesondere die Zugfestigkeit des Heizleiters erhöht. Als Kern ist entspre- chend bevorzugt ein hochzugfestes Filamentbündel eingesetzt. Weist der zweite Heizleiter ebenfalls einen Kern auf, so ist es bevorzugt, wenn auch dieser Kern aus nichtleitenden Multifilament-Fasern gebildet ist. The first heating conductor and the second heating conductor are preferably twisted or stranded with one another to form the heating conductor strand. In this way, a so-called ' twisted pair ' heating conductor strand is formed, by means of which influences from external fields largely cancel each other out. To improve the laying properties, the first heating conductor and the second heating conductor are expediently twisted in opposite directions. The core of the first heating conductor is preferably formed from non-conductive multifilament fibers. By using a core made of multifilaments, the tensile strength of the heating conductor is increased in particular. Accordingly, a high tensile strength filament bundle is preferably used as the core. If the second heat conductor also has a core, it is preferred if this core is also formed from non-conductive multifilament fibers.
Zur Ausbildung des Flächenheizelementes ist der durch den ersten Heizleiter und den zweiten Heizleiter gebildete Heizleiterstrang zweckmäßigerweise an einem Trä- germaterial angeordnet. Als Trägermaterialien eignen sich insbesondere flexible Ma- terialien wie Textilien, Gewirke oder Gewebe. Besonders bevorzugt ist als Trägerma- terial ein Vlies eingesetzt. Vorzugsweise ist der zumindest eine Heizleiterstrang auf das Trägermaterial aufgenäht oder aufgestickt. Weiter von Vorteil ist der zumindest eine Heizleiterstrang zwischen zwei Lagen eines Trägermaterials angeordnet. To form the surface heating element, the heating conductor strand formed by the first heating conductor and the second heating conductor is expediently arranged on a carrier material. Flexible materials such as textiles, knitted fabrics or woven fabrics are particularly suitable as carrier materials. A nonwoven is particularly preferably used as the carrier material. The at least one heating conductor strand is preferably sewn or embroidered onto the carrier material. Another advantage is that the at least one heating conductor strand is arranged between two layers of a carrier material.
Zweckmäßigerweise spannt der durch den ersten Heizleiter und den zweiten Heizlei- ter gebildete Heizleiterstrang auf dem Trägermaterial mäandernd oder wellenförmig eine Heizfläche auf. Hierdurch wird eine gleichmäßige Flächenbeheizung erreicht und gleichzeitig die mechanischen Belastungen bei Dehnungen des Flächenheiz- elementes in Quer- und Längsrichtung, wie sie beispielsweise bei einem im Fahr- zeug als Sitzheizung verbauten Flächenheizelement auftreten, gering gehalten. The heating conductor strand formed by the first heating conductor and the second heating conductor expediently spans a heating surface on the carrier material in a meandering or undulating manner. In this way, uniform surface heating is achieved and at the same time the mechanical stresses in the event of expansion of the surface heating element in the transverse and longitudinal directions, as occur, for example, in the case of a surface heating element installed in the vehicle as seat heating, are kept low.
Das erfindungsgemäße Verfahren dient der Herstellung eines magnetfeldreduzieren- den Flächenheizelements für ein Kraftfahrzeug. Hierbei wird ein Trägermaterial vor- gelegt und auf diesem Trägermaterial zumindest zwei, einen Heizleiterstrang bilden- de Heizleiter sich entlang ihres Weges berührend in gleicher Richtung verlaufend befestigt. Erfindungsgemäß werden die zumindest zwei Heizleiter dem Trägermateri- al von einer gemeinsamen Aufnahmevorrichtung zugeführt. The method according to the invention serves to produce a magnetic field-reducing surface heating element for a motor vehicle. In this case, a carrier material is presented and at least two heating conductors forming a heating conductor strand are attached to this carrier material, touching their path in the same direction. According to the invention, the at least two heating conductors are fed to the carrier material from a common receiving device.
Die Aufnahmevorrichtung stellt somit eine gemeinsame Vorlage- bzw. Vorhalteein- richtung für beide auf dem Trägermaterial anzuordnende Heizleiter dar. Die Heizleiter werden dem Trägermaterial aus dieser Aufnahmevorrichtung gemeinsam und insbe- sondere gleichzeitig zugeführt. Vorzugsweise wird als Aufnahmevorrichtung eine Vorratsspule eingesetzt, auf welcher die Heizleiter aufgerollt bzw. aufgewickelt sind. The holding device thus represents a common presentation or retention device for both heating conductors to be arranged on the carrier material. The heating conductors are fed to the carrier material from this receiving device jointly and in particular simultaneously. A supply spool is preferably used as the receiving device, on which the heating conductors are rolled up or wound up.
Bevorzugt werden die zumindest zwei Heizleiter vor der Aufbringung auf das Trä- germaterial miteinander verdrillt. In einer besonders vorteilhaften Ausgestaltung sind die beiden Heizleiter bereits miteinander zu einem Heizleiterstrang verdrillt auf der Aufnahmevorrichtung gelagert. Mit anderen Worten wird durch die Aufnahmevorrich- tung vorzugsweise ein Heizleiterstrang aus zwei verdrillten Heizleitern vorgelegt. The at least two heating conductors are preferably twisted together before being applied to the carrier material. In a particularly advantageous embodiment, the two heating conductors are already twisted together on the receiving device to form a heating conductor strand. In other words, a heating conductor strand consisting of two twisted heating conductors is preferably provided by the receiving device.
Eine alternative Ausgestaltung sieht vor, dass beide Heizleiterstränge erst nach der Entnahme von bzw. der Bereitstellung durch die gemeinsame Aufnahmevorrichtung unter Ausbildung des Heizleiterstranges miteinander verdrillt werden. Hierzu sind die beiden Heizleiter bevorzugt nebeneinander auf einer rotierenden Aufnahmevorrich- tung, also beispielsweise auf einer einteiligen oder einer mehrteiligen Vorratsspule angeordnet und werden gemeinsam von dieser abgewickelt. Durch die Rotation der Aufnahmevorrichtung bei der Abwicklung der Heizleiter werden diese - vor der Auf- bringung auf das Trägermaterial - miteinander verdrillt. Zweckmäßigerweise werden die zwei Heizleiter durch einen im Zick-Zack-Stich geführten Faden auf dem Träger- material befestigt. An alternative embodiment provides that the two heating conductor strands are only twisted together after the removal or provision by the common receiving device, with the heating conductor strand being formed. For this purpose, the two heating conductors are preferably arranged next to one another on a rotating receiving device, that is to say, for example, on a one-part or a multi-part supply spool and are unwound together from this. The rotation of the holding device during the unwinding of the heating conductors causes them to be twisted together before being applied to the carrier material. The two heating conductors are expediently fastened to the carrier material by a thread guided in a zigzag stitch.
Die für das erfindungsgemäße magnetfeldreduzierende Flächenheizelement genann- ten Vorteile können weiter sinngemäß auf das Verfahren übertragen werden. The advantages mentioned for the magnetic field-reducing surface heating element according to the invention can also be applied analogously to the method.
Weitere Einzelheiten und Merkmale der Erfindung ergeben sich aus der nachfolgen- den Beschreibung von Ausführungsbeispielen anhand der Zeichnung. In der Zeich- nung zeigt Further details and features of the invention result from the following description of exemplary embodiments with reference to the drawing. In the drawing shows
Figur 1 ein erfindungsgemäßes magnetfeldreduzierendes Flächenheizelement mit einem auf einem Trägermaterial aufgebrachten Heizleiterstrang in einer Draufsicht, Figur 2 einen Querschnitt durch den Heizleiterstrang gemäß Figur 1 , FIG. 1 shows a top view of a magnetic field-reducing surface heating element according to the invention with a heating conductor strand applied to a carrier material, FIG. 2 shows a cross section through the heating conductor strand according to FIG. 1,
Figur 2.1 einen Querschnitt durch einen weiteren Heizleiterstrang, sowie Figure 2.1 shows a cross section through a further heat conductor strand, and
Figur 3 eine schematische Darstellung einer Vorrichtung zur Herstellung des magnetfeldreduzierenden Flächenheizelementes gemäß Figur 1. FIG. 3 shows a schematic illustration of a device for producing the magnetic field-reducing surface heating element according to FIG. 1.
Einander entsprechende Teile sind in allen Figuren stets mit gleichen Bezugszeichen versehen. Corresponding parts are always provided with the same reference symbols in all figures.
Figur 1 zeigt in schematischer Darstellung ein erfindungsgemäßes magnetfeldredu- zierendes Flächenheizelement 1 in einer Draufsicht. Das Flächenheizelement 1 um- fasst ein Vlies 2 als Trägermaterial 3, auf welchem ein Heizleiterstrang 4 wellenför- mig aufgebracht ist. Der Heizleiterstrang 4 spannt hierdurch eine Heizfläche 5 auf. FIG. 1 shows a top view of a magnetic field-reducing surface heating element 1 according to the invention in a schematic illustration. The surface heating element 1 comprises a fleece 2 as the carrier material 3, on which a heating conductor strand 4 is applied in a wave shape. As a result, the heating conductor strand 4 spans a heating surface 5.
Der Heizleiterstrang 4 ist aus zwei Heizleitern 7, 8 gebildet, die miteinander verdrillt sind. Die Heizleiter 7, 8 sind gemäß der vorliegenden Darstellung separat voneinan- der gegenläufig mit beispielsweise 12 V Gleichstrom beaufschlagt. Die Heizleiter 7, 8 werden also parallel zueinander über jeweils zwei Kontaktstellen 9, 10 (angedeutet durch gestrichelte Pfeile) pro Heizleiter 7, 8 bestromt. Durch die entgegengesetzte Bestromung der Heizleiter 7, 8 mit betragsmäßig gleichen Strömen wird ein Flächen- heizelement 1 geschaffen, dessen resultierendes Magnetfeld unterhalb vorgegebe- ner Grenzwerte liegt und somit keine Gesundheitsgefahr für den Nutzer darstellt. The heating conductor strand 4 is formed from two heating conductors 7, 8, which are twisted together. According to the present illustration, the heating conductors 7, 8 are acted upon separately in opposite directions, for example with 12 V direct current. The heating conductors 7, 8 are thus energized in parallel with one another via two contact points 9, 10 (indicated by dashed arrows) per heating conductor 7, 8. The opposite energization of the heating conductors 7, 8 with currents of the same amount creates a surface heating element 1, the resulting magnetic field of which is below specified limit values and thus does not represent a health hazard for the user.
Eine Schnittdarstellung der beiden den Heizleiterstrang 4 bildenden Heizleiter 7, 8 ist in Figur 2 gezeigt. Beide Heizleiter 7, 8 umfassen vorliegend jeweils drei leitfähige Filamente 11. Die Filamente 11 des ersten Heizleiters 7 sind spiralförmig um einen hochzugfesten Kern 12 aus nicht-leitenden Multifilamenten 13 angeordnet. Der zwei- te Heizleiter 8 weist vorliegend keinen Kern auf. Die Filamente 11 des zweiten Heiz- leiters 8 sind hier miteinander verdrillt. Die spiralförmige Wicklung der Filamente 11 um den Kern 12 des ersten Heizleiters 7 sowie die Verdrillung der Filamente 11 des zweiten Heizleiters 8 sind aufgrund der Schnittdarstellung nicht zu entnehmen. Die Filamente 11 des ersten Heizleiters 7 sind jeweils mit einer umhüllenden Lack- schicht 14 versehen und hierdurch zueinander isoliert. Zusätzlich umfasst der erste Heizleiter 7 einen äußeren Mantel 15 aus einem Isoliermaterial 16, der alle um den Kern 12 gewickelten Filamente 11 gemeinsam ummantelt. A sectional view of the two heating conductors 7, 8 forming the heating conductor strand 4 is shown in FIG. 2. In the present case, both heating conductors 7, 8 each comprise three conductive filaments 11. The filaments 11 of the first heating conductor 7 are arranged in a spiral around a high-tensile core 12 made of non-conductive multifilaments 13. The second heating conductor 8 has no core in the present case. The filaments 11 of the second heating conductor 8 are twisted here. The spiral winding of the filaments 11 around the core 12 of the first heating conductor 7 and the twisting of the filaments 11 of the second heating conductor 8 cannot be seen on the basis of the sectional illustration. The filaments 11 of the first heating conductor 7 are each provided with an enveloping lacquer layer 14 and thereby insulated from one another. In addition, the first heating conductor 7 comprises an outer jacket 15 made of an insulating material 16, which coats all the filaments 11 wound around the core 12 together.
Im Unterschied hierzu weist der zweite Heizleiters 8 nur ein mit einer umhüllenden Lackschicht 14 versehenes Filament 11 auf. Die beiden übrigen Filamente 11 sind frei von einer Lackschicht 14. Auch weist der zweite Heizleiter 8 keine die Filamente 11 umgebende Mantelisolation 15 auf. Eine Isolierung des zweiten mantelfreien Heizleiters 8 erfolgt stattdessen dadurch, dass der zweite Heizleiter 8 den Mantel 15 des ersten Heizleiters 7 zumindest abschnittsweise berührt. Dies wird insbesondere durch eine Verdrillung der beiden den Heizleiterstrang 4 bildenden Heizleiter 7,8 ('twisted pair'-Heizleiterstrang) erreicht. In contrast to this, the second heating conductor 8 has only one filament 11 provided with an enveloping lacquer layer 14. The two remaining filaments 11 are free of a lacquer layer 14. The second heating conductor 8 also has no jacket insulation 15 surrounding the filaments 11. Instead, the second jacket-free heating conductor 8 is insulated by the second heating conductor 8 touching the jacket 15 of the first heating conductor 7 at least in sections. This is achieved in particular by twisting the two heating conductors 7,8 ( ' twisted pair ' heating conductor strand) forming the heating conductor strand 4.
Eine alternative Ausgestaltung des Heizleiters 4 mit den beiden Heizleitersträngen 7, 8 ist Figur 2.1 zu entnehmen. Im Unterschied zu Figur 2 umfasst der zweite Heizleiter 8 hier ebenfalls einen hochzugfesten Kern 12 aus nicht-leitenden Multifilamenten 13, um welchen die Filamente 11 des zweiten Heizleiters 8 spiralförmig gewickelt sind. Der übrige Aufbau der Heizleiter 7, 8 kann von Figur 2 auf die in Figur 2.1 gezeigten Heizleiter 7, 8 übertragen werden. An alternative embodiment of the heating conductor 4 with the two heating conductor strands 7, 8 can be seen in FIG. 2.1. In contrast to FIG. 2, the second heating conductor 8 here also comprises a high-tensile core 12 made of non-conductive multifilaments 13, around which the filaments 11 of the second heating conductor 8 are wound in a spiral. The remaining structure of the heating conductors 7, 8 can be transferred from FIG. 2 to the heating conductors 7, 8 shown in FIG. 2.1.
In Figur 3 ist ein Teilbereich einer Stickvorrichtung 17 zur Herstellung eines magnetfeldreduzierenden Heizelements 1 mittels des erfindungsgemäßen Verfahrens ge- zeigt. Hierbei wird das Trägermaterial 3 vorgelegt und anschließend die Heizleiter 7,FIG. 3 shows a partial area of an embroidery device 17 for producing a magnetic field-reducing heating element 1 by means of the method according to the invention. Here, the carrier material 3 is presented and then the heating conductor 7,
8 dem Trägermaterial 3 zugeführt, auf diesem abgelegt und auf dem Trägermaterial 3 befestigt. 8 fed to the carrier material 3, deposited thereon and fastened on the carrier material 3.
Die beiden Heizleiter 7, 8 sind vorliegend in Form des bereits verdrillten Heizleiter- stranges 4 von einer gemeinsamen Aufnahmevorrichtung 18 aufgenommen. Die Aufnahmevorrichtung 18 ist hier als eine einteilige Vorratsspule 19 ausgebildet, auf welcher der verdrillte Heizleiterstrang 4 aufgewickelt ist. Ausgehend von der Vorratsspule 19 wird der Heizleiterstrang 4 mittels einer an der Vorratsspule 19 angeordneten, vorliegend schlauchartig ausgebildete Zuführung 20, einem einen Stickfaden 21 führenden Stickfuß 22 zugeführt, auf das Trägermaterial 3 aufgelegt und anschließend mit einer Naht 23 im Zick-Zack-Stich auf dem Trägerma- terial 3 festgestickt. In the present case, the two heating conductors 7, 8 are received in the form of the already twisted heating conductor strand 4 by a common receiving device 18. The receiving device 18 is designed here as a one-piece supply spool 19, on which the twisted heat conductor strand 4 is wound. Starting from the supply spool 19, the heating conductor strand 4 is placed on the carrier material 3 by means of a feed 20 arranged on the supply spool 19, in the present case in the form of a tube, and is attached to the base material 3 and then with a seam 23 in a zigzag stitch the carrier material 3 is embroidered.
Ebenso ist es mittels des erfindungsgemäßen Verfahrens grundsätzlich möglich, zwei oder mehrere Heizleiter parallel nebeneinander (beispielsweise als Steg bzw. oder als Zwillingsleitung) auf einem Trägermaterial festzusticken. Auch in diesem Fall stellt die Aufnahmevorrichtung 18 eine gemeinsame Vorlage- bzw. Vorhalteeinrich- tung für die jeweiligen Heizleiter dar. It is also possible in principle by means of the method according to the invention to embroider two or more heating conductors in parallel next to one another (for example as a web or as a twin line) on a carrier material. In this case, too, the receiving device 18 represents a common presentation or retention device for the respective heating conductors.

Claims

Patentansprüche Claims
1. Magnetfeld reduzierendes Flächenheizelement (1 ) für ein Kraftfahrzeug, mit zumindest einem Heizleiterstrang (4), der zumindest einen ersten Heizleiter (7) mit zumindest drei Filamenten (11 ) umfasst, die jeweils mittels einer um- hüllenden Lackschicht (14) zueinander isoliert und spiralförmig um einen Kern (12) gewickelt sind, wobei der erste Heizleiter (7) einen äußeren Mantel (15) umfasst, 1. Magnetic field-reducing surface heating element (1) for a motor vehicle, with at least one heating conductor strand (4), which comprises at least one first heating conductor (7) with at least three filaments (11), each of which is insulated from one another by means of a coating layer (14) and are wound spirally around a core (12), the first heating conductor (7) comprising an outer jacket (15),
dadurch gekennzeichnet, dass  characterized in that
der Heizleiterstrang (4) einen den äußeren Mantel (15) des ersten Heizleiters (7) zumindest abschnittsweise berührenden zweiten Heizleiter (8) umfasst, der außer einer Lackschicht (14) um zumindest ein Filament (11 ) frei von einer Isolierung ist.  the heating conductor strand (4) comprises a second heating conductor (8) which at least in sections contacts the outer jacket (15) of the first heating conductor (7) and which, apart from a lacquer layer (14) around at least one filament (11), is free of insulation.
2. Magnetfeldreduzierendes Flächenheizelement (1 ) nach Anspruch 1 , 2. magnetic field reducing surface heating element (1) according to claim 1,
dadurch gekennzeichnet, dass  characterized in that
der erste Heizleiter (7) und der zweite Heizleiter (8) des Heizleiterstranges (4) gegenläufig bestrombar sind.  the first heating conductor (7) and the second heating conductor (8) of the heating conductor strand (4) can be energized in opposite directions.
3. Magnetfeldreduzierendes Flächenheizelement (1 ) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass 3. magnetic field reducing surface heating element (1) according to claim 1 or 2, characterized in that
der erste Heizleiter (7) und der zweite Heizleiter (7) separat voneinander bestrombar sind.  the first heating conductor (7) and the second heating conductor (7) can be energized separately from one another.
4. Magnetfeldreduzierendes Flächenheizelement (1 ) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der erste Heizleiter (7) und der zweite Heizleiter (8) an ihren Enden (8) elektrisch miteinander verbunden sind. 4. magnetic field reducing surface heating element (1) according to claim 1 or 2, characterized in that the first heating conductor (7) and the second heating conductor (8) are electrically connected to one another at their ends (8).
5. Magnetfeldreduzierendes Flächenheizelement (1 ) nach einem der vorherge- henden Ansprüche, 5. magnetic field-reducing surface heating element (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
eine Mehrzahl der Filamente (11 ) des zweiten Heizleiters (8) mit einer diese umhüllenden Lackschicht (14) versehen sind.  a plurality of the filaments (11) of the second heating conductor (8) are provided with a lacquer layer (14) enveloping them.
6. Magnetfeldreduzierendes Flächenheizelement (1 ) nach einem der vorherge- henden Ansprüche, 6. Magnetic field-reducing surface heating element (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
zumindest ein Filament (11 ) des zweiten Heizleiters (8) als ein Kern-Mantel- Draht ausgebildet ist.  at least one filament (11) of the second heating conductor (8) is designed as a core-sheath wire.
7. Magnetfeldreduzierendes Flächenheizelement (1 ) nach einem der vorherge- henden Ansprüche, 7. Magnetic field reducing surface heating element (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
die Filamente (11 ) des ersten Heizleiters (7) spiralförmig gegenläufig um des- sen Kern (12) gewickelt sind.  the filaments (11) of the first heating conductor (7) are wound spirally in opposite directions around its core (12).
8. Magnetfeldreduzierendes Flächenheizelement (1 ) nach einem der vorherge- henden Ansprüche, 8. Magnetic field reducing surface heating element (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
der erste Heizleiter (7) und der zweite Heizleiter (8) unter Ausbildung des Heizleiterstranges (4) miteinander verdrillt sind.  the first heating conductor (7) and the second heating conductor (8) are twisted together to form the heating conductor strand (4).
9. Magnetfeldreduzierendes Flächenheizelement (1 ) nach einem der vorherge- henden Ansprüche, 9. Magnetic field reducing surface heating element (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
der erste Heizleiter (7) und der zweite Heizleiter (7) in unterschiedlichen Schlagrichtungen verdrillt sind. the first heating conductor (7) and the second heating conductor (7) are twisted in different directions.
10. Magnetfeldreduzierendes Flächenheizelement (1 ) nach einem der vorherge- henden Ansprüche, 10. Magnetic field reducing surface heating element (1) according to one of the preceding claims,
dadurch gekennzeichnet, dass  characterized in that
der Kern (12) des ersten Heizleiters (7) aus nichtleitenden Multifilament- Fasern (13) gebildet ist.  the core (12) of the first heating conductor (7) is formed from non-conductive multifilament fibers (13).
11.Magnetfeld reduzierendes Flächenheizelement (1 ) nach einem der vorherge- henden Ansprüche, 11. A magnetic field reducing surface heating element (1) according to one of the preceding claims,
gekennzeichnet durch  marked by
ein Trägermaterial (3), an welchem der durch den ersten Heizleiter (7) und den zweiten Heizleiter (8) gebildete Heizleiterstrang (4) angeordnet ist.  a carrier material (3) on which the heating conductor strand (4) formed by the first heating conductor (7) and the second heating conductor (8) is arranged.
12. Magnetfeld reduzierendes Flächenheizelement (1 ) nach Anspruch 11 , 12. magnetic field reducing surface heating element (1) according to claim 11,
dadurch gekennzeichnet, dass  characterized in that
der durch den ersten Heizleiter (7) und den zweiten Heizleiter (8) gebildete Heizleiterstrang (4) auf dem Trägermaterial (3) mäandernd oder wellenförmig eine Heizfläche (5) aufspannt.  the heating conductor strand (4) formed by the first heating conductor (7) and the second heating conductor (8) spans a heating surface (5) on the carrier material (3) in a meandering or undulating manner.
13. Verfahren zur Herstellung eines magnetfeldreduzierenden Flächenheizele- ments (1 ) für ein Kraftfahrzeug, 13. Method for producing a magnetic field-reducing surface heating element (1) for a motor vehicle,
- wobei ein Trägermaterial (3) vorgelegt wird, und  - Wherein a carrier material (3) is presented, and
- wobei zumindest zwei einen Heizleiterstrang (4) bildende Heizleiter (7, 8) sich entlang ihres Weges berührend in gleicher Richtung verlaufend auf dem Trägermaterial (4) befestigt werden,  - At least two heating conductors (7, 8) forming a heating conductor strand (4) are fastened touching along their path in the same direction and running on the carrier material (4),
dadurch gekennzeichnet, dass  characterized in that
die zumindest zwei Heizleiter (7, 8) dem Trägermaterial (3) ausgehend von ei- ner gemeinsamen Aufnahmevorrichtung (18) zugeführt werden.  the at least two heating conductors (7, 8) are fed to the carrier material (3) starting from a common receiving device (18).
14. Verfahren nach Anspruch 13, 14. The method according to claim 13,
dadurch gekennzeichnet, dass die zumindest zwei Heizleiter (7, 8) vor der Aufbringung auf das Trägermateri- al (4) unter Ausbildung des Heizleiterstranges (4) miteinander verdrillt werden. characterized in that the at least two heating conductors (7, 8) are twisted together before being applied to the carrier material (4) to form the heating conductor strand (4).
15. Verfahren nach Anspruch 13 oder 14, 15. The method according to claim 13 or 14,
dadurch gekennzeichnet, dass  characterized in that
die zumindest zwei Heizleiter (7, 8) durch einen im Zick-Zack-Stich geführten Faden (21 ) gemeinsam auf dem Trägermaterial (3) befestigt werden.  the at least two heating conductors (7, 8) are fastened together on the carrier material (3) by a thread (21) guided in a zigzag stitch.
PCT/DE2019/000243 2018-10-02 2019-09-19 Magnetic field-reducing flat heating element for a motor vehicle WO2020069687A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112019005000.1T DE112019005000A5 (en) 2018-10-02 2019-09-19 Magnetic field-reducing surface heating element for a motor vehicle
EP19794084.4A EP3861831A1 (en) 2018-10-02 2019-09-19 Magnetic field-reducing flat heating element for a motor vehicle

Applications Claiming Priority (4)

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DEDE202018004633.7 2018-10-02
DE102018007753.6A DE102018007753A1 (en) 2018-10-02 2018-10-02 Magnetic field reducing surface heating element for a motor vehicle
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DEDE102018007753.6 2018-10-02

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29610436U1 (en) 1996-06-14 1996-11-07 Koenig Roland Magnetic field-free heating pad (electric blanket)
DE10309207A1 (en) 2002-08-08 2004-02-26 W.E.T. Automotive Systems Ag Heating conductor, with a conductive core, has a plastics mantle shrouding incorporating a heat-activated adhesive to reduce the materials and prevent contact with adhesives during production
DE60104991T2 (en) * 2000-02-11 2005-08-18 Kongsberg Automotive Ab HEATING DEVICE FOR A VEHICLE COMPONENT
US20080251511A1 (en) * 2007-04-10 2008-10-16 Myoung Jun Lee Apparatus for heating vehicle seat
DE102007019891A1 (en) * 2007-04-27 2008-11-06 Conti Temic Microelectronic Gmbh Heating device for heating e.g. vehicle seating, has sets of wire-shaped electrical heating elements, where element from one set is supplied with current opposite to heating element of another set, where elements are arranged in parallel
DE102009010417A1 (en) * 2008-03-04 2009-09-10 König & Hohmann & Otto Lübeck GmbH & Co. KG Seat heating pad manufacturing method for e.g. motor vehicle, involves adjusting flat length that limits manufacturing length such that wire of flat length is provided in sufficient length as feed pipes for connecting poles of source
EP1705957B1 (en) 2005-03-21 2011-08-10 W.E.T. Automotive Systems Ag Electrical heating conductor
DE102012219578B4 (en) 2012-10-25 2016-09-15 DIGEL STICKTECH GmbH & Co. KG Fiber laying machine for simultaneous laying and sewing of multiple fiber strands

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29610436U1 (en) 1996-06-14 1996-11-07 Koenig Roland Magnetic field-free heating pad (electric blanket)
DE60104991T2 (en) * 2000-02-11 2005-08-18 Kongsberg Automotive Ab HEATING DEVICE FOR A VEHICLE COMPONENT
DE10309207A1 (en) 2002-08-08 2004-02-26 W.E.T. Automotive Systems Ag Heating conductor, with a conductive core, has a plastics mantle shrouding incorporating a heat-activated adhesive to reduce the materials and prevent contact with adhesives during production
EP1705957B1 (en) 2005-03-21 2011-08-10 W.E.T. Automotive Systems Ag Electrical heating conductor
US20080251511A1 (en) * 2007-04-10 2008-10-16 Myoung Jun Lee Apparatus for heating vehicle seat
DE102007019891A1 (en) * 2007-04-27 2008-11-06 Conti Temic Microelectronic Gmbh Heating device for heating e.g. vehicle seating, has sets of wire-shaped electrical heating elements, where element from one set is supplied with current opposite to heating element of another set, where elements are arranged in parallel
DE102009010417A1 (en) * 2008-03-04 2009-09-10 König & Hohmann & Otto Lübeck GmbH & Co. KG Seat heating pad manufacturing method for e.g. motor vehicle, involves adjusting flat length that limits manufacturing length such that wire of flat length is provided in sufficient length as feed pipes for connecting poles of source
DE102012219578B4 (en) 2012-10-25 2016-09-15 DIGEL STICKTECH GmbH & Co. KG Fiber laying machine for simultaneous laying and sewing of multiple fiber strands

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