EP1821322B1 - Magnetic body and method for its production - Google Patents

Magnetic body and method for its production Download PDF

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Publication number
EP1821322B1
EP1821322B1 EP07003487A EP07003487A EP1821322B1 EP 1821322 B1 EP1821322 B1 EP 1821322B1 EP 07003487 A EP07003487 A EP 07003487A EP 07003487 A EP07003487 A EP 07003487A EP 1821322 B1 EP1821322 B1 EP 1821322B1
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Prior art keywords
magnetic
magnetic component
hard
component
soft magnetic
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EP07003487A
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German (de)
French (fr)
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EP1821322A1 (en
Inventor
Frank Barlog
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BARLOG plastics GmbH
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BARLOG plastics GmbH
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
    • H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/113—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
    • H01F1/117—Flexible bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/36—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles
    • H01F1/37—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites in the form of particles in a bonding agent
    • H01F1/375—Flexible bodies
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/021—Construction of PM
    • H01F7/0215—Flexible forms, sheets

Definitions

  • the invention relates to a magnetic body, comprising a hard magnetic component, which is permanently magnetically formed with at least one north and south pole and a soft magnetic component, wherein the hard magnetic and the soft magnetic component are arranged in adjacent discrete layers of the magnetic body.
  • the invention also relates to a method for producing such a magnetic body with a hard magnetic component which is permanently magnetically formed with at least one north and south pole and a soft magnetic component, wherein the hard magnetic and soft magnetic components are arranged in adjacent discrete layers of the magnetic body.
  • hard magnetic components which are permanently magnetically formed with soft magnetic components within a magnetic body
  • the hard magnetic component is used primarily to generate the desired magnetic field of the magnetic body, while the soft magnetic component of the gain and orientation of the hard magnetic component permanently generated magnetic field is used.
  • the soft magnetic component for this purpose, for example, on the FR 1,184,468 A . DE 1 899 989 U and DE 198 10 612 C2 directed.
  • a hard magnetic permanent magnet is provided with a cladding of a metal sheet substrate which has soft magnetic properties and effects the desired alignment and amplification of the magnetic field.
  • soft magnetic components based on an injection-moldable plastic, which is provided with appropriate fillers, including on the DE 198 49 781 A1 is referenced.
  • Such a soft magnetic plastic can also be produced by the known method, be processed in particular by injection molding, with such products are particularly suitable for the production of inductive components.
  • Magnetic bodies are required for a variety of applications, some of which should have complex shapes.
  • the use of a hard magnetic polymer composition is only conditionally applicable because the achievable by these polymer compositions magnetic holding or repulsive forces can be realized only in relatively small sizes and at higher desired holding or repulsion forces is always necessary to additionally provide a consuming separately produced soft magnetic component.
  • Object of the present invention is therefore to propose a simple and rational producible magnetic body, which generates particularly high holding or repulsive forces and should be produced in complex forms, and to provide a method for producing the same.
  • the proposal according to the invention is based on providing hard magnetic component as a carrier material filled with hard magnetic fillers based on thermoplastic materials and to provide as a soft magnetic component filled with soft magnetic fillers based on thermoplastic materials. These two components are formed in the desired configuration to discrete layers adjacent to each other and the thus adjacent discrete layers of hard magnetic and soft magnetic component are at least partially melt-bonded together due to the proposed support material based on thermoplastic materials, so that a multilayer magnetic body consisting of hard magnetic and soft magnetic components.
  • Such a magnetic body can be formed, for example, using a multi-component injection molding machine or by compression molding or coextrusion, extrusion coating, laminating or laminating in a conventional manner, so that despite complex shapes high cycle rates are possible with particularly economical production of the magnetic body according to the invention.
  • a semicrystalline thermoplastic material is used, since such a partially crystalline thermoplastic material can be filled not only with the highest possible Grestoflhalten, but such semi-crystalline plastics also have special temperature resistance, which is for example for sensor applications with thermal stress , eg predestined in the automotive industry.
  • thermoplastic material which can be used as carrier material for the hard-magnetic and / or soft-magnetic component include polyamides, in particular PA6, 66, 12, but also polypropylene, polyphenylene sulfide or a polyether hetero ketone or blends thereof.
  • the hard magnetic component can be filled with ferrite particles in an amount of 10 to 95 wt .-% based on the carrier material, with higher filling levels and higher magnetic forces are obtained.
  • the type of ferrite particles to be used for the hard magnetic component is not subject to any general restriction; both so-called low-energy ferrites and high-energy ferrites may be used, although the latter are particularly preferred.
  • high-energy ferrite particles having a density of 5.0 to 5.2 g / cm 3 and an average particle size of 1.5 to 2.5 ⁇ m can be used, which more preferably has a remanence of 155 to 180 mT and a have intrinsic coercivity of 155 to 250 kA / m.
  • high-energy ferrites whose remanence is 165 to 180 mT and whose intrinsic coercivity is 180 to 250 kA / m.
  • the material used as a filling material for the soft magnetic component is not subject to any general restrictions, but soft magnetic particles based on iron powder, magnetite powder or so-called soft ferrites, for example, a manganese zinc ferrite powder or mixtures thereof, wherein iron powder due to its high saturation remanence of these is particularly preferred.
  • iron powder When iron powder is used, it has proven to be suitable with a particle size of less than 160 ⁇ m and a bulk density of between 6.9 and 6.95 g / cm 3 .
  • magnetite powder this may for example have a density of 5.1 g / cm 3 , a bulk density of about 2.5 g / cm 3 and typical particle sizes in the range between 5 and 25 microns with a Mohs hardness between 5.5 to 6 have.
  • a Mn-Zn ferrite powder is used, its density may be, for example, 4.7 g / cm 3 at a bulk density of 1.8 g / cm 3 and an average particle size between 1 and 100 ⁇ m.
  • the layer thickness of the hard magnetic component should be at least 2 mm, on the other hand, the layer thickness of the soft magnetic component from 0.8 mm and more is sufficient.
  • a small air gap of z. B. 0.2 mm gap width between the hard and the soft magnetic layer may be necessary, at least in some areas a small air gap of z. B. 0.2 mm gap width between the hard and the soft magnetic layer to prevent a so-called magnetic short circuit.
  • Such an air gap for example, by appropriate shaping of a tool used for the production of magnetic body, such as a Injection molding tool, generated or subsequently introduced mechanically.
  • a tool used for the production of magnetic body such as a Injection molding tool, generated or subsequently introduced mechanically.
  • the adjacent layers in the air gap-free region of the magnetic body are fusion-bonded together.
  • the magnetic body according to the invention can also be provided that several layers of the hard magnetic component are provided with interposition of each layer of the soft magnetic component and each layer of the hard magnetic component has at least one north pole and one south pole, so that a multi-pole magnetic body is formed ,
  • the formation of an air gap is usually not necessary, i. the contiguous discrete layers are preferably completely melt-bonded together.
  • the inventive method for producing a previously described magnetic body with a hard magnetic component and a soft magnetic component is based on that produced in a first extruder, a melt of a thermoplastic carrier material and hard magnetic fillers and in a second extruder, a melt of a thermoplastic carrier material and soft magnetic fillers generated. These generated melts are then formed into at least two discrete adjacent layers to form the magnetic body, which are then at least partially fused together, and subsequently the formed layers of the hard magnetic component are permanently magnetized by applying a magnetic field.
  • the layer formation and joining can be carried out both in such a way that both layers are joined together in a molten state, as is the case for example in the coextrusion, or it is first a layer of a first component produced and after their solidification the adjacent second layer of the second component injected, as is the case for example in the two-component injection molding process.
  • the carrier material made of a thermoplastic material is responsible for the fusion bonding of the individual layers of the hard-magnetic and soft-magnetic component, the methods common for plastics processing can be used correspondingly without major difficulties.
  • FIG. 1 is a perspective view of a magnetic body according to the invention shown, as he used, for example, as a magnetic dowel for furniture Can be used, for example, to hold doors in a closed position.
  • the magnetic body in this case comprises a substantially cylindrical inner core, which is formed from a hard magnetic component 1, while along the outer circumference of the hard magnetic component 1 is a soft magnetic component 2 in the form of a tubular strand.
  • the hard magnetic component 1 and the soft magnetic component 2 are present in respectively discrete layers 10, 20.
  • both the hard magnetic component 1 and the soft magnetic component 2 are made of the above-explained materials, i. the hard magnetic component 1 comprises a base material based on a thermoplastic, e.g. PA 6, and is highly filled with hard magnetic ferrites, e.g. at 85 to 92% by weight, while the soft magnetic component 2 is also formed from a thermoplastic based base material, preferably also a polyamide, and is filled with soft magnetic fillers, for example iron powder, e.g. also with 85 to 92 wt .-%.
  • a thermoplastic e.g. PA 6
  • soft magnetic component 2 is also formed from a thermoplastic based base material, preferably also a polyamide, and is filled with soft magnetic fillers, for example iron powder, e.g. also with 85 to 92 wt .-%.
  • the magnetic body according to FIG. 1 For example, it can be produced by injection molding of both components in a mold or by coextrusion of corresponding melt strands, it being ensured in both cases that the hard magnetic component 1 and the soft magnetic component 2 are melt-bonded together along their interfaces, so that a compact magnetic body consisting of a layer 10 of the hard magnetic component 1 and a layer 20 of the soft magnetic component 2 is formed.
  • the ferrite particles within the hard magnetic layer 10th oriented, so that sets a desired polarity, for example, with the drawn north pole N and south pole S.
  • a cylindrical air gap L of a gap width of, for example, 0.2 mm is formed between the layers 10, 20 extending along the layer boundary to slightly more than half the total length of the magnet body, preferably up to 2 / 3 of the total length thereof, which is indicated by the dotted line in FIG. 1 is indicated.
  • the discrete layers 10, 20 are directly adjacent to one another and are fusion-bonded together here.
  • the air gap L can be generated directly by appropriate shaping of the injection molding tool used, or e.g. be subsequently introduced mechanically when manufactured as extruded strand.
  • FIGS. 2a and 2b shows magnetic body respectively discrete layers 10 of the hard magnetic component 1, which are divided by appropriate conditioning of a magnetic field in turn in north pole N and south pole S areas. Between the individual layers 10 of the hard magnetic component 1 and in the region of the outer circumference of the magnetic body, the soft magnetic component 2 is further provided in the form of corresponding layers 20.
  • Such a magnetic body can also be produced by coextrusion of corresponding number of layers, but especially by injection molding in a multi-component injection molding process, in that on the one hand the soft magnetic component 2 for forming the layers 20 and on the other hand the hard magnetic component 1 for forming the layers 10 are sprayed together in discrete layers and melted together and subsequently by conditioning the corresponding magnetic field the desired orientation of the respective layers 10 of the hard magnetic material in the north - and south poles N, S done.

Abstract

A body has a hard magnetic component (1), which is formed permanent magnetically with north and south poles (N, S), and a soft magnetic component (2). The components are arranged on discrete layers (10, 20) that are adjacent to each other. The components have substrates that are filled with hard and soft magnetic fillers, based on thermoplastic plastics, respectively. The discrete layers of the components are connected with each other in a fusion manner. A polyamide, polypropylene, polyphenylene sulfide or a polyetheretherketone or mixtures of these are used as the substrates. An independent claim is also included for the production of a magnetic body with hard magnetic components and soft magnetic components.

Description

Die Erfindung betrifft einen Magnetkörper, umfassend eine hartmagnetische Komponente, die permanentmagnetisch mit mindestens einem Nord- und Südpol ausgebildet ist und eine weichmagnetische Komponente, wobei die hartmagnetische und die weichmagnetische Komponente in aneinander angrenzenden diskreten Schichten des Magnetkörpers angeordnet sind.The invention relates to a magnetic body, comprising a hard magnetic component, which is permanently magnetically formed with at least one north and south pole and a soft magnetic component, wherein the hard magnetic and the soft magnetic component are arranged in adjacent discrete layers of the magnetic body.

Ferner betrifft die Erfindung auch ein Verfahren zur Herstellung eines derartigen Magnetkörpers mit einer hartmagnetischen Komponente die permanentmagnetisch mit mindestens einem Nord- und Südpol ausgebildet ist und einer weichmagnetischen Komponente, wobei die hartmagnetischen und weichmagnetischen Komponenten in aneinander angrenzenden diskreten Schichten des Magnetkörpers angeordnet sind.Furthermore, the invention also relates to a method for producing such a magnetic body with a hard magnetic component which is permanently magnetically formed with at least one north and south pole and a soft magnetic component, wherein the hard magnetic and soft magnetic components are arranged in adjacent discrete layers of the magnetic body.

Die Kombination von hartmagnetischen Komponenten, die permanentmagnetisch ausgebildet sind mit weichmagnetischen Komponenten innerhalb eines Magnetkörpers ist seit langem bekannt. Hierbei dient die hartmagnetische Komponente primär der Erzeugung des gewünschten Magnetfeldes des Magnetkörpers, während die weichmagnetische Komponente der Verstärkung und Ausrichtung des von der hartmagnetischen Komponente permanent erzeugten Magnetfeldes dient. Hierzu wird beispielsweise auf die FR 1,184,468 A , DE 1 899 989 U und DE 198 10 612 C2 verwiesen.The combination of hard magnetic components, which are permanently magnetically formed with soft magnetic components within a magnetic body has long been known. Here, the hard magnetic component is used primarily to generate the desired magnetic field of the magnetic body, while the soft magnetic component of the gain and orientation of the hard magnetic component permanently generated magnetic field is used. For this purpose, for example, on the FR 1,184,468 A . DE 1 899 989 U and DE 198 10 612 C2 directed.

Beispielsweise wird ein hartmagnetischer Permanentmagnet mit einer Ummantelung aus einem Metallblechsubstrat versehen, welches weichmagnetische Eigenschaften besitzt und die gewünschte Ausrichtung und Verstärkung des Magnetfeldes bewirkt.For example, a hard magnetic permanent magnet is provided with a cladding of a metal sheet substrate which has soft magnetic properties and effects the desired alignment and amplification of the magnetic field.

Aus der US-A-3,535,200 ist es bekannt, hart- und weichmagnetische Komponenten in aneinander angrenzenden diskreten Schichten anzuordnen und Formteile aus der Schichtenlage auszustechen, die nachfolgend unter Ausbildung eines Magnetkörpers gesintert werden.From the US-A-3,535,200 It is known to arrange hard and soft magnetic components in adjacent discrete layers and punch out of the layer layer, which are subsequently sintered to form a magnetic body.

Es ist darüber hinaus bereits bekannt, hartmagnetische Komponenten aus einem Kunststoff-Trägermaterial herzustellen, in welches hartmagnetische Ferritmaterialien eingebettet sind, wozu beispielsweise auf die EP 0 298 764 B1 verwiesen wird. Derartige magnetische Polymerzusammensetzungen lassen sich in der für die Kunststoffverarbeitung gewohnten Weise z.B. durch Spritzgießen oder Extrudieren zu Formkörpern verarbeiten.It is also already known to produce hard magnetic components of a plastic substrate, in which hard magnetic ferrite materials are embedded, including, for example, on the EP 0 298 764 B1 is referenced. Such magnetic polymer compositions can be processed in the usual way for the plastics processing, for example by injection molding or extrusion to give moldings.

Es sind auch bereits Versuche unternommen worden, derartige hartmagnetische Polymerzusammensetzungen mit weichmagnetischen Komponenten zu kombinieren, beispielsweise indem ein aus weichmagnetischem Metallblech bestehendes Gehäuse mit einer derartigen hartmagnetischen Polymerzusammensetzung ausgespritzt wird. Dies ist jedoch sehr aufwendig, da die weichmagnetische Komponente stets als separates Bauteil aufwendig in beispielsweise eine Spritzgussform eingelegt werden muss und zuvor in einem separaten Arbeitsgang erstellt werden muss.Attempts have also been made to combine such hard magnetic polymer compositions with soft magnetic components, for example, by ejecting a soft magnetic metal sheet housing with such a hard magnetic polymer composition. However, this is very expensive, since the soft magnetic component must always be inserted as a separate component consuming example in an injection mold and previously created in a separate operation.

Darüber hinaus ist es auch bekannt, weichmagnetische Komponenten auf Basis eines spritzgießfähigen Kunststoffes, der mit entsprechenden Füllstoffen versehen ist, herzustellen, wozu auf die DE 198 49 781 A1 verwiesen wird. Auch ein derartiger weichmagnetischer Kunststoff kann nach dem bekannten Verfahren, insbesondere im Spritzgussverfahren verarbeitet werden, wobei sich derartige Produkte insbesondere zur Herstellung induktiver Bauelemente eignen.In addition, it is also known to produce soft magnetic components based on an injection-moldable plastic, which is provided with appropriate fillers, including on the DE 198 49 781 A1 is referenced. Such a soft magnetic plastic can also be produced by the known method, be processed in particular by injection molding, with such products are particularly suitable for the production of inductive components.

Für vielfältige Anwendungszwecke werden Magnetkörper benötigt, die zum Teil komplexe Formen aufweisen sollen. Hier ist jedoch bislang die Verwendung einer hartmagnetischen Polymerzusammensetzung nur bedingt anwendbar, da sich die durch diese Polymerzusammensetzungen erreichbaren magnetischen Halte- bzw. Abstoßungskräfte nur in relativ niedrigen Größenordnungen realisieren lassen und es bei höheren gewünschten Halte- bzw. Abstoßungskräften stets notwendig ist, eine aufwendig separat herzustellende weichmagnetische Komponente zusätzlich vorzusehen.Magnetic bodies are required for a variety of applications, some of which should have complex shapes. Here, however, the use of a hard magnetic polymer composition is only conditionally applicable because the achievable by these polymer compositions magnetic holding or repulsive forces can be realized only in relatively small sizes and at higher desired holding or repulsion forces is always necessary to additionally provide a consuming separately produced soft magnetic component.

Aufgabe der vorliegenden Erfindung ist es daher, einen einfach und rationell herstellbaren Magnetkörper vorzuschlagen, der besonders hohe Halte- bzw. Abstoßungskräfte erzeugt und auch in komplexen Formen herstellbar sein soll, sowie ein Verfahren zur Herstellung desselben anzugeben.Object of the present invention is therefore to propose a simple and rational producible magnetic body, which generates particularly high holding or repulsive forces and should be produced in complex forms, and to provide a method for producing the same.

Zur Lösung der gestellten Aufgabe wird erfindungsgemäß ein Magnetkörper gemäß den Merkmalen des Patentanspruchs vorgeschlagen.To achieve the object, a magnetic body according to the features of the claim is proposed according to the invention.

Ein erfindungsgemäßes Verfahren zur Herstellung eines solchen Magnetkörpers ist im Patentanspruch 13 angegeben.An inventive method for producing such a magnetic body is specified in claim 13.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung sind Gegenstand der jeweiligen Unteransprüche.Advantageous embodiments and further developments of the invention are the subject of the respective subclaims.

Der erfindungsgemäße Vorschlag beruht darauf, als hartmagnetische Komponente ein mit hartmagnetischen Füllstoffen gefülltes Trägermaterial auf Basis thermoplastischer Kunststoffe vorzusehen und als weichmagnetische Komponente ein mit weichmagnetischen Füllstoffen gefülltes Trägermaterial auf Basis thermoplastischer Kunststoffe vorzusehen. Diese beiden Komponenten werden in der gewünschten Konfiguration zu diskreten Schichten ausgebildet, welche aneinander angrenzen und die solchermaßen aneinander angrenzenden diskreten Schichten der hartmagnetischen und weichmagnetischen Komponente werden aufgrund des vorgesehenen Trägermaterials auf Basis thermoplastischer Kunststoffe zumindest bereichsweise miteinander schmelzverbunden, so dass ein mehrschichtiger Magnetkörper bestehend aus hartmagnetischen und weichmagnetischen Komponenten erhalten wird.The proposal according to the invention is based on providing hard magnetic component as a carrier material filled with hard magnetic fillers based on thermoplastic materials and to provide as a soft magnetic component filled with soft magnetic fillers based on thermoplastic materials. These two components are formed in the desired configuration to discrete layers adjacent to each other and the thus adjacent discrete layers of hard magnetic and soft magnetic component are at least partially melt-bonded together due to the proposed support material based on thermoplastic materials, so that a multilayer magnetic body consisting of hard magnetic and soft magnetic components.

Ein solcher Magnetkörper kann beispielsweise unter Verwendung einer Mehrkomponenten-Spritzgussmaschine oder mittels Formpressen oder auch im Koextrusions-, Extrusionsbeschichtungs-, Kaschier- oder Laminierverfahren in an sich bekannter Weise ausgebildet werden, so dass trotz komplexer Formgebungen hohe Taktzahlen bei besonders wirtschaftlicher Herstellung des erfindungsgemäßen Magnetkörpers möglich werden.Such a magnetic body can be formed, for example, using a multi-component injection molding machine or by compression molding or coextrusion, extrusion coating, laminating or laminating in a conventional manner, so that despite complex shapes high cycle rates are possible with particularly economical production of the magnetic body according to the invention.

Als Trägermaterial für die hartmagnetische und/oder weichmagnetische Komponente wird ein teilkristalliner thermoplastischer Kunststoff eingesetzt, da sich ein solcher teilkristalliner thermoplastischer Kunststoff nicht nur mit möglichst hohen Füllstoflgehalten füllen lässt, sondern solche teilkristalline Kunststoffe auch besondere Temperaturbeständigkeit aufweisen, was sie beispielsweise für Sensorikanwendungen mit thermischer Belastung, z.B. im Automobilbau prädestiniert.As a carrier material for the hard magnetic and / or soft magnetic component, a semicrystalline thermoplastic material is used, since such a partially crystalline thermoplastic material can be filled not only with the highest possible Füllstoflhalten, but such semi-crystalline plastics also have special temperature resistance, which is for example for sensor applications with thermal stress , eg predestined in the automotive industry.

Es versteht sich, dass für die Erzielung einer guten Schmelzverbindbarkeit und auch für eine spätere sortenreine Entsorgung als Trägermaterial der hart- und weichmagnetischen Komponente bevorzugt gleiche Kunststoffe eingesetzt werden, obwohl dies nicht notwendigerweise der Fall sein muss.It is understood that preferably the same plastics are used to achieve a good fusible linkability and also for subsequent sorted disposal as a carrier material of the hard and soft magnetic component, although this need not necessarily be the case.

Beispiele des als Trägermaterial für die hartmagnetische und/oder weichmagnetische Komponente einsetzbaren thermoplastischen Kunststoffes umfassen Polyamide, hier insbesondere PA6, 66, 12, aber auch Polypropylen, Polyphenylensulfid oder ein Polyetherehterketon oder Abmischungen derselben.Examples of the thermoplastic material which can be used as carrier material for the hard-magnetic and / or soft-magnetic component include polyamides, in particular PA6, 66, 12, but also polypropylene, polyphenylene sulfide or a polyether hetero ketone or blends thereof.

Die hartmagnetische Komponente kann mit Ferritpartikeln in einer Menge von 10 bis 95 Gew.-% bezogen auf das Trägermaterial gefüllt werden, wobei mit steigendem Füllgrad auch höhere Magnetkräfte erhalten werden.The hard magnetic component can be filled with ferrite particles in an amount of 10 to 95 wt .-% based on the carrier material, with higher filling levels and higher magnetic forces are obtained.

Die Art der für die hartmagnetische Komponente einzusetzende Ferritpartikel unterliegt keiner generellen Beschränkung, es können sowohl so genannte Low-Energy-Ferrite wie auch High-Energy-Ferrite eingesetzt werden, wobei jedoch Letztere besonders bevorzugt sind.The type of ferrite particles to be used for the hard magnetic component is not subject to any general restriction; both so-called low-energy ferrites and high-energy ferrites may be used, although the latter are particularly preferred.

Insbesondere können High-Energy-Ferritpartikel mit einer Dichte von 5,0 bis 5,2 g/cm3 und einer durchschnittlichen Partikelgröße von 1,5 bis 2,5 µm eingesetzt werden, die weiter bevorzugt eine Remanenz von 155 bis 180 mT und eine intrinsische Koerzivität von 155 bis 250 kA/m aufweisen. Besonders bevorzugt sind hierbei High-Energy-Ferrite, deren Remanenz 165 bis 180 mT und deren intrinsische Koerzivität 180 bis 250 kA/m beträgt.In particular, high-energy ferrite particles having a density of 5.0 to 5.2 g / cm 3 and an average particle size of 1.5 to 2.5 μm can be used, which more preferably has a remanence of 155 to 180 mT and a have intrinsic coercivity of 155 to 250 kA / m. Especially preferred These are high-energy ferrites whose remanence is 165 to 180 mT and whose intrinsic coercivity is 180 to 250 kA / m.

Auch das als Füllmaterial für die weichmagnetische Komponente verwendete Material unterliegt keinen generellen Beschränkungen, besonders bevorzugt sind jedoch weichmagnetische Partikel auf Basis von Eisenpulver, Magnetitpulver oder auch so genannte Weich-Ferrite, beispielsweise ein Mangan-Zink-Ferritpulver oder Abmischungen derselben, wobei Eisenpulver aufgrund seiner hohen Sättigungsremanenz von diesen besonders bevorzugt ist.Also, the material used as a filling material for the soft magnetic component is not subject to any general restrictions, but soft magnetic particles based on iron powder, magnetite powder or so-called soft ferrites, for example, a manganese zinc ferrite powder or mixtures thereof, wherein iron powder due to its high saturation remanence of these is particularly preferred.

Bei Verwendung von Eisenpulver hat sich ein solches mit einer Partikelgröße kleiner 160 µm und einer Rohdichte zwischen 6,9 und 6,95 g/cm3 bewährt.When iron powder is used, it has proven to be suitable with a particle size of less than 160 μm and a bulk density of between 6.9 and 6.95 g / cm 3 .

Sofern Magnetitpulver eingesetzt wird, kann dieses beispielsweise eine Dichte von 5,1 g/cm3, eine Schüttdichte von ca. 2,5 g/cm3 und typische Partikelgrößen im Bereich zwischen 5 und 25 µm bei einer Mohs-Härte zwischen 5,5 bis 6 aufweisen.If magnetite powder is used, this may for example have a density of 5.1 g / cm 3 , a bulk density of about 2.5 g / cm 3 and typical particle sizes in the range between 5 and 25 microns with a Mohs hardness between 5.5 to 6 have.

Sofern ein Mn-Zn-Ferritpulver verwendet wird, kann dessen Dichte beispielsweise 4,7 g/cm3 bei einer Schüttdichte von 1,8 g/cm3 betragen und eine mittlere Korngröße zwischen 1 bis 100 µm vorliegen.If a Mn-Zn ferrite powder is used, its density may be, for example, 4.7 g / cm 3 at a bulk density of 1.8 g / cm 3 and an average particle size between 1 and 100 μm.

Damit die Magnetkräfte des erfindungsgemäßen Magnetkörpers sich in einem zufriedenstellenden Bereich bewegen, sollte die Schichtdicke der hartmagnetischen Komponente mindestens 2 mm betragen, wobei andererseits die Schichtdicke der weichmagnetischen Komponente ab 0,8 mm und mehr ausreichend ist.In order for the magnetic forces of the magnetic body according to the invention to move in a satisfactory range, the layer thickness of the hard magnetic component should be at least 2 mm, on the other hand, the layer thickness of the soft magnetic component from 0.8 mm and more is sufficient.

Je nach Konfiguration und Formgebung des erfindungsgemäßen Magnetkörpers kann es erforderlich sein, zumindest bereichsweise einen geringen Luftspalt von z. B. 0,2 mm Spaltbreite zwischen der hart- und der weichmagnetischen Schicht vorzusehen, um einen sogenannten magnetischen Kurzschluss zu verhindern. Ein solcher Luftspalt kann z.B. durch entsprechende Formgebung eines verwendeten Werkzeuges für die Magnetkörperherstellung, etwa ein Spritzgusswerkzeug, erzeugt oder auch nachträglich mechanisch eingebracht werden. Auch in diesem Falle sind jedoch die aneinander angrenzenden Schichten in dem luftspaltfreien Bereich des Magnetkörpers miteinander schmelzverbunden.Depending on the configuration and shape of the magnetic body according to the invention, it may be necessary, at least in some areas a small air gap of z. B. 0.2 mm gap width between the hard and the soft magnetic layer to prevent a so-called magnetic short circuit. Such an air gap, for example, by appropriate shaping of a tool used for the production of magnetic body, such as a Injection molding tool, generated or subsequently introduced mechanically. However, even in this case, the adjacent layers in the air gap-free region of the magnetic body are fusion-bonded together.

In einer weiteren bevorzugten Ausführungsform des erfindungsgemäßen Magnetkörpers kann auch vorgesehen sein, dass mehrere Schichten der hartmagnetischen Komponente unter Zwischenlage jeweils einer Schicht der weichmagnetischen Komponente vorgesehen sind und jede Schicht der hartmagnetischen Komponente mindestens einen Nordpol und einen Südpol aufweist, so dass ein mehrpoliger Magnetkörper gebildet wird. Bei dieser Ausführungsform ist üblicherweise die Ausbildung eines Luftspaltes nicht notwendig, d.h. die aneinander angrenzenden diskreten Schichten sind bevorzugt vollständig miteinander schmelzverbunden.In a further preferred embodiment of the magnetic body according to the invention can also be provided that several layers of the hard magnetic component are provided with interposition of each layer of the soft magnetic component and each layer of the hard magnetic component has at least one north pole and one south pole, so that a multi-pole magnetic body is formed , In this embodiment, the formation of an air gap is usually not necessary, i. the contiguous discrete layers are preferably completely melt-bonded together.

Das erfindungsgemäße Verfahren zur Herstellung eines vorangehend beschriebenen Magnetkörpers mit einer hartmagnetischen Komponente und einer weichmagnetischen Komponente beruht darauf, dass man in einem ersten Extruder eine Schmelze aus einem thermoplastischen Trägermaterial und hartmagnetischen Füllstoffen erzeugt und in einem zweiten Extruder eine Schmelze aus einem thermoplastischen Trägermaterial und weichmagnetischen Füllstoffen erzeugt. Diese erzeugten Schmelzen werden sodann zu mindestens zwei diskreten, aneinander angrenzenden Schichten unter Ausbildung des Magnetkörpers geformt, welche sodann zumindest bereichsweise miteinander schmelzverbunden werden und nachfolgend werden die ausgebildeten Schichten der hartmagnetischen Komponente durch Anlegen eines Magnetfeldes permanent magnetisiert.The inventive method for producing a previously described magnetic body with a hard magnetic component and a soft magnetic component is based on that produced in a first extruder, a melt of a thermoplastic carrier material and hard magnetic fillers and in a second extruder, a melt of a thermoplastic carrier material and soft magnetic fillers generated. These generated melts are then formed into at least two discrete adjacent layers to form the magnetic body, which are then at least partially fused together, and subsequently the formed layers of the hard magnetic component are permanently magnetized by applying a magnetic field.

Hierbei kann die Schichtenausformung und Aneinanderfügung sowohl in der Weise erfolgen, dass beide Schichten in schmelzflüssigem Zustand miteinander verbunden werden, wie es beispielsweise bei der Koextrusion der Fall ist, oder aber es wird zunächst eine Schicht aus einer ersten Komponente erzeugt und nach deren Erstarrung die angrenzende zweite Schicht aus der zweiten Komponente angespritzt, wie es beispielsweise beim Zweikomponenten-Spritzgussverfahren der Fall ist.Here, the layer formation and joining can be carried out both in such a way that both layers are joined together in a molten state, as is the case for example in the coextrusion, or it is first a layer of a first component produced and after their solidification the adjacent second layer of the second component injected, as is the case for example in the two-component injection molding process.

Da für das Schmelzverbinden der einzelnen Schichten der hartmagnetischen und weichmagnetischen Komponente jeweils das Trägermaterial aus einem thermoplastischen Kunststoff verantwortlich ist, lassen sich die für die Kunststoffverarbeitung gängigen Verfahren hier ohne größere Schwierigkeiten entsprechend anwenden.Since the carrier material made of a thermoplastic material is responsible for the fusion bonding of the individual layers of the hard-magnetic and soft-magnetic component, the methods common for plastics processing can be used correspondingly without major difficulties.

Im Folgenden werden anhand von Ausführungsbeispielen in der Zeichnung Anwendungsfälle des erfindungsgemäßen Magnetkörpers dargestellt, wobei jedoch die Erfindung keinesfalls auf die hier dargestellten Ausführungsbeispiele beschränkt ist. Aufgrund der Verarbeitbarkeit der hart- und weichmagnetischen Komponente des erfindungsgemäßen Magnetkörpers sowohl im Spritzgussverfahren wie auch im Extrusionsverfahren und dergleichen mehr können die verschiedensten Raumformen eines Magnetkörpers und an verschiedenste Anwendungszwecke angepasste Magnetkörper erstellt werden.In the following, use cases of the magnetic body according to the invention will be illustrated by means of embodiments in the drawing, but the invention is by no means limited to the embodiments shown here. Due to the processability of the hard and soft magnetic component of the magnetic body according to the invention both in the injection molding process as well as in the extrusion process and the like, the most diverse spatial forms of a magnetic body and adapted to a variety of applications magnetic body can be created.

Im Einzelnen zeigen die Figuren:

Figur 1
eine perspektivische Darstellung einer ersten Ausführungsform eines erfindungsgemäßen Magnetkörpers,
Figur 2a
einen Vertikalschnitt durch eine weitere Ausführungsform eines erfindungsgemäßen Magnetkörpers,
Figur 2b
die Aufsicht auf den Magnetkörper gemäß Figur 2a,
Figur 3
die Aufsicht auf eine weitere Ausführungsform eines erfindungsgemäßen Magnetkörpers.
In detail, the figures show:
FIG. 1
a perspective view of a first embodiment of a magnetic body according to the invention,
FIG. 2a
a vertical section through a further embodiment of a magnetic body according to the invention,
FIG. 2b
the supervision of the magnetic body according to FIG. 2a .
FIG. 3
the plan view of another embodiment of a magnetic body according to the invention.

In der Figur 1 ist in perspektivischer Darstellung ein Magnetkörper gemäß der Erfindung dargestellt, wie er beispielsweise als Magnetdübel für den Möbelbau Verwendung finden kann, um z.B. Türen in einer geschlossenen Position zu haltern.In the FIG. 1 is a perspective view of a magnetic body according to the invention shown, as he used, for example, as a magnetic dowel for furniture Can be used, for example, to hold doors in a closed position.

Der Magnetkörper umfasst hierbei einen im Wesentlichen zylindrischen Innenkern, der aus einer hartmagnetischen Komponente 1 gebildet ist, während entlang des Außenumfanges der hartmagnetischen Komponente 1 eine weichmagnetische Komponente 2 in Form eines rohrförmigen Stranges vorliegt.The magnetic body in this case comprises a substantially cylindrical inner core, which is formed from a hard magnetic component 1, while along the outer circumference of the hard magnetic component 1 is a soft magnetic component 2 in the form of a tubular strand.

Aufgrund dieser Konfiguration liegen die hartmagnetische Komponente 1 und die weichmagnetische Komponente 2 in jeweils diskreten Schichten 10, 20 vor.Due to this configuration, the hard magnetic component 1 and the soft magnetic component 2 are present in respectively discrete layers 10, 20.

Sowohl die hartmagnetische Komponente 1 wie auch die weichmagnetische Komponente 2 sind aus den vorangehend erläuterten Materialien hergestellt, d.h. die hartmagnetische Komponente 1 umfasst ein Trägermaterial auf Basis eines thermoplastischen Kunststoffes, z.B. PA 6, und ist mit hartmagnetischen Ferriten hoch gefüllt, z.B. mit 85 bis 92 Gew-%, während die weichmagnetische Komponente 2 ebenfalls aus einem Trägermaterial auf Basis thermoplastischer Kunststoffe, vorzugsweise ebenfalls eines Polyamids gebildet ist und mit weichmagnetischen Füllstoffen, beispielsweise Eisenpulver hoch gefüllt ist, z.B. ebenfalls mit 85 bis 92 Gew.-%.Both the hard magnetic component 1 and the soft magnetic component 2 are made of the above-explained materials, i. the hard magnetic component 1 comprises a base material based on a thermoplastic, e.g. PA 6, and is highly filled with hard magnetic ferrites, e.g. at 85 to 92% by weight, while the soft magnetic component 2 is also formed from a thermoplastic based base material, preferably also a polyamide, and is filled with soft magnetic fillers, for example iron powder, e.g. also with 85 to 92 wt .-%.

Der Magnetkörper gemäß Figur 1 kann beispielsweise durch Spritzguss beider Komponenten in einer Form hergestellt sein oder auch durch Koextrusion entsprechender Schmelzestränge, wobei in beiden Fällen gewährleistet ist, dass die hartmagnetische Komponente 1 und die weichmagnetische Komponente 2 entlang ihrer Grenzflächen miteinander schmelzverbunden sind, so dass ein kompakter Magnetkörper, bestehend aus einer Schicht 10 aus der hartmagnetischen Komponente 1 und einer Schicht 20 aus der weichmagnetischen Komponente 2 gebildet ist.The magnetic body according to FIG. 1 For example, it can be produced by injection molding of both components in a mold or by coextrusion of corresponding melt strands, it being ensured in both cases that the hard magnetic component 1 and the soft magnetic component 2 are melt-bonded together along their interfaces, so that a compact magnetic body consisting of a layer 10 of the hard magnetic component 1 and a layer 20 of the soft magnetic component 2 is formed.

Durch Anlegen eines entsprechenden Magnetfeldes, bei Herstellung im Spritzgussverfahren beispielsweise noch während des Formens des Magnetkörpers, werden sodann die Ferritpartikel innerhalb der hartmagnetischen Schicht 10 orientiert, so dass sich eine gewünschte Polarität beispielsweise mit dem eingezeichneten Nordpol N und Südpol S einstellt.By applying a corresponding magnetic field, during production by injection molding, for example during the molding of the magnetic body, then the ferrite particles within the hard magnetic layer 10th oriented, so that sets a desired polarity, for example, with the drawn north pole N and south pole S.

Zur Vermeidung eines sogenannten magnetischen Kurzschlusses ist im dargestellten Ausführungsbeispiel gemäß Figur 1 ausgehend von dem als Nordpol N ausgeführten Ende des Magnetkörpers ein zylindrischer Luftspalt L einer Spaltbreite von z.B. 0,2 mm zwischen den Schichten 10, 20 ausgebildet, der sich entlang der Schichtgrenze auf etwas mehr als der Hälfte der Gesamtlänge des Magnetkörpers, vorzugsweise bis zu 2/3 der Gesamtlänge desselben erstreckt, was durch die punktierte Linie in Figur 1 angedeutet ist. Im verbleibenden Bereich der Gesamtlänge des Magnetkörpers liegen die diskreten Schichten 10, 20 hingegen unmittelbar aneinander an und sind hier miteinander schmelzverbunden.To avoid a so-called magnetic short circuit in the illustrated embodiment according to FIG. 1 starting from the end of the magnet body designed as north pole N, a cylindrical air gap L of a gap width of, for example, 0.2 mm is formed between the layers 10, 20 extending along the layer boundary to slightly more than half the total length of the magnet body, preferably up to 2 / 3 of the total length thereof, which is indicated by the dotted line in FIG. 1 is indicated. In the remaining region of the total length of the magnetic body, however, the discrete layers 10, 20 are directly adjacent to one another and are fusion-bonded together here.

Bei Herstellung des Magnetkörpers 1 als Spritzgussteil kann der Luftspalt L durch entsprechende Formgebung des verwendeten Spritzgusswerkzeuges unmittelbar erzeugt oder z.B. bei Herstellung als extrudierter Strang nachträglich mechanisch eingebracht werden.When manufacturing the magnetic body 1 as an injection-molded part, the air gap L can be generated directly by appropriate shaping of the injection molding tool used, or e.g. be subsequently introduced mechanically when manufactured as extruded strand.

In einem demgegenüber abgewandelten Ausführungsbeispiel gemäß den Figuren 2a und 2b ist es im Rahmen der Erfindung auch möglich, mehrpolige Magnetkörper beispielsweise durch Spritzguss oder Extrusion der hartmagnetischen und weichmagnetischen Komponente 1, 2 und gegenseitiges Schmelzverbinden derselben herzustellen.In a contrast modified embodiment according to the FIGS. 2a and 2b It is also possible within the scope of the invention to produce multipole magnetic bodies, for example by injection molding or extrusion of the hard magnetic and soft magnetic component 1, 2 and mutual fusion bonding thereof.

So umfasst der in den Figuren 2a und 2b dargestellte Magnetkörper jeweils diskrete Schichten 10 aus der hartmagnetischen Komponente 1, die durch entsprechende Anlage eines Magnetfeldes ihrerseits in Nordpol N- und Südpol S-Bereiche unterteilt sind. Zwischen den einzelnen Schichten 10 aus der hartmagnetischen Komponente 1 und im Bereich des Außenumfanges des Magnetkörpers ist ferner die weichmagnetische Komponente 2 in Form entsprechender Schichten 20 vorgesehen. Auch ein solcher Magnetkörper kann durch Koextrusion entsprechender Schichtenanzahlen, insbesondere aber durch Spritzgießen im Mehrkomponenten-Spritzgussverfahren hergestellt werden, indem einerseits die weichmagnetische Komponente 2 zur Ausbildung der Schichten 20 und andererseits die hartmagnetische Komponente 1 zur Ausbildung der Schichten 10 in diskreten Schichten aneinandergespritzt und miteinander schmelzverbunden werden und nachfolgend durch Anlage des entsprechenden Magnetfeldes die gewünschte Orientierung der jeweiligen Schichten 10 aus dem hartmagnetischen Material in Nord- und Südpole N, S erfolgt.So includes in the FIGS. 2a and 2b shown magnetic body respectively discrete layers 10 of the hard magnetic component 1, which are divided by appropriate conditioning of a magnetic field in turn in north pole N and south pole S areas. Between the individual layers 10 of the hard magnetic component 1 and in the region of the outer circumference of the magnetic body, the soft magnetic component 2 is further provided in the form of corresponding layers 20. Such a magnetic body can also be produced by coextrusion of corresponding number of layers, but especially by injection molding in a multi-component injection molding process, in that on the one hand the soft magnetic component 2 for forming the layers 20 and on the other hand the hard magnetic component 1 for forming the layers 10 are sprayed together in discrete layers and melted together and subsequently by conditioning the corresponding magnetic field the desired orientation of the respective layers 10 of the hard magnetic material in the north - and south poles N, S done.

Neben dem Ausführungsbeispiel gemäß Figuren 2a und 2b mit zueinander parallel verlaufenden Schichten 10, 20 ist es gemäß Ausführungsbeispiel in der Figur 3 selbstverständlich auch möglich, die einzelnen Schichten 10, 20 in entsprechender Abfolge in Form konzentrischer Ringschichten zu gruppieren, wobei durch Anlage eines entsprechenden Magnetfeldes wiederum in den einzelnen hartmagnetischen Schichten 10 eine Orientierung in Nordpole N und Südpole S erfolgt.In addition to the embodiment according to FIGS. 2a and 2b with mutually parallel layers 10, 20 it is according to embodiment in the FIG. 3 Of course, it is also possible to group the individual layers 10, 20 in a corresponding sequence in the form of concentric ring layers, whereby an orientation in north poles N and south poles S takes place again by applying a corresponding magnetic field in the individual hard magnetic layers 10.

Bei derartigen Ausführungsformen gemäß Figuren 2a bis 3 ist in der Regel kein Luftspalt L erforderlich, so dass die diskreten Schichten vollständig entlang ihrer Grenzflächen miteinander schmelzverbunden sind.In such embodiments according to FIGS. 2a to 3 As a rule, no air gap L is required, so that the discrete layers are completely melt-bonded together along their interfaces.

Es versteht sich, dass die vorangehend erläuterte Erfindung nicht auf die Herstellung von Magnetkörpern gemäß den Figuren beschränkt ist, sondern insbesondere bei Anwendung des Spritzgussverfahrens, vorzugsweise Mehrkomponenten-Spritzgussverfahrens auch Magnetkörper mit komplexen Geometrien geschaffen werden können, so dass sich ein vielfältiges Einsatzfeld für die erfindungsgemäßen Magnetkörper ergibt.It is understood that the above-explained invention is not limited to the production of magnetic bodies according to the figures, but also when using the injection molding process, preferably multi-component injection molding process and magnetic body can be created with complex geometries, so that a diverse field of application for the invention Magnet body results.

Claims (24)

  1. Magnetic body, comprising a hard magnetic component (1), which is formed permanently magnetic with at least a north and south pole (N, S), and a soft magnetic component (2), the hard magnetic and the soft magnetic component being arranged in mutually adjacent discrete layers (10, 20) of the magnetic body, characterised in that the hard magnetic component (1) comprises a carrier material which is filled with hard magnetic fillers and based on thermoplastic plastics materials and the soft magnetic component (2) comprises a carrier material, which is filled with soft magnetic fillers and based on thermoplastic plastics materials, a partially crystalline thermoplastic plastics material being used as the carrier material for the hard magnetic and/or soft magnetic component (1, 2), and the mutually adjacent discrete layers (10, 20) of the hard magnetic and soft magnetic component (1, 2) being fused to one another at least in regions.
  2. Magnetic body according to claim 1, characterised in that a polyamide, polypropylene, polyphenylene sulphide or a polyetheretherketone or mixtures thereof are used as the carrier material for the hard magnetic and/or soft magnetic component (1, 2).
  3. Magnetic body according to either of claims 1 or 2, characterised in that the hard magnetic component (1) is filled with ferrite particles in a quantity of 10 to 95 % by weight, based on the carrier material.
  4. Magnetic body according to claim 3, characterised in that high-energy ferrite particles with a density of 5.0 to 5.2 g/cm3 and an average particle size of 1.5 to 2.5 µm are used.
  5. Magnetic body according to claim 3 or 4, characterised in that the ferrite particles have a remanence of 155 to 180 mT and an intrinsic coercivity of 155 to 250 kA/m.
  6. Magnetic body according to any one of claims 1 to 5, characterised in that the soft magnetic component (2) is filled with particles based on iron powder, magnetite powder or manganese-zinc-ferrite powder or mixtures thereof.
  7. Magnetic body according to any one of claims 1 to 6, characterised in that the layer thickness of the hard magnetic component (1) is at least 2 mm.
  8. Magnetic body according to any one of claims 1 to 7, characterised in that the layer thickness of the soft magnetic component (2) is at least 0.8 mm.
  9. Magnetic body according to any one of claims 1 to 8, characterised in that a plurality of layers (10) of the hard magnetic component (1) is provided with the interposition in each case of a layer (20) of the soft magnetic component (2) and each layer (10) of the hard magnetic component (1) has at least one north pole (N) and one south pole (S).
  10. Magnetic body according to anyone of claims 1 to 9, characterised in that it is produced by injection moulding.
  11. Magnetic body according to any one of claims 1 to 9, characterised in that it is produced by lining, lamination, extrusion coating or coextrusion of layers of the hard magnetic and soft magnetic component.
  12. Magnetic body according to any one of claims 1 to 11, characterised in that an air gap (L) is formed in regions between adjacent layers (10; 20) of the hard magnetic and soft magnetic component (1, 2).
  13. Method for producing a magnetic body with a hard magnetic component (1), which is formed permanently magnetic with at least a north and south pole (N, S), and a soft magnetic component (2), the hard magnetic and soft magnetic components (1, 2) being arranged in mutually adjacent discrete layers (10, 20) of the magnetic body, characterised in that a melt made of a thermoplastic carrier material and hard magnetic fillers is produced in a first extruder and a melt made of a thermoplastic carrier material and soft magnetic fillers is produced in a second extruder, and the melts produced are formed into at least two discrete, mutually adjacent layers (10, 20) with the formation of the magnetic body, which layers are fused to one another at least in regions and the formed layers (10) of the hard magnetic component (1) are then permanently magnetised by applying a magnetic field.
  14. Method according to claim 13, characterised in that the layers (10, 20) of the hard and soft magnetic component (1, 2) are formed by multi-component injection moulding and fused to one another.
  15. Method according to claim 13, characterised in that the layers (10, 20) of the hard and soft magnetic component (1, 2) are formed by extrusion coating, lining, lamination or coextrusion and fused to one another.
  16. Method according to any one of claims 13 to 15, characterised in that a partially crystalline thermoplastic plastics material is used as the carrier material for the hard magnetic and/or soft magnetic component (1, 2).
  17. Method according to any one of claims 13 to 16, characterised in that a polyamide, polypropylene, polyphenylene sulphide or a polyetheretherketone or mixtures thereof are used as the carrier material for the hard magnetic and/or soft magnetic component (1, 2).
  18. Method according to any one of claims 13 to 17, characterised in that the hard magnetic component (1) is filled with ferrite particles in a quantity of 10 to 95 % by weight, based on the carrier material.
  19. Method according to claim 18, characterised in that high-energy ferrite particles with a density of 5.0 to 5.2 g/cm3 and an average particle size of 1.5 to 2.5 µm are used.
  20. Method according to either of claims 18 or 19, characterised in that the ferrite particles have a remanence of 155 to 180 mT and an intrinsic coercivity of 155 to 250 kA/m.
  21. Method according to any one of claims 13 to 20, characterised in that the soft magnetic component (2) is filled with particles based on iron powder, magnetite powder or manganese-zinc-ferrite powder or mixtures thereof.
  22. Method according to any one of claims 13 to 21, characterised in that the layer thickness of the hard magnetic component (1) is at least 2 mm.
  23. Method according to any one of claims 13 to 22, characterised in that the layer thickness of the soft magnetic component (2) is at least 0.8 mm.
  24. Method according to any one of claims 13 to 23, characterised in that a plurality of layers (10) of the hard magnetic component (1) is provided with the interposition in each case of a layer (20) of the soft magnetic component (2), and each layer (10) of the hard magnetic component (1) has a least one north pole (N) and one south pole (S).
EP07003487A 2006-02-20 2007-02-20 Magnetic body and method for its production Not-in-force EP1821322B1 (en)

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FR1184468A (en) * 1956-10-24 1959-07-22 Eisen & Stahlind Ag Magnetic holding system
DE1899989U (en) * 1964-07-10 1964-09-03 Deutsche Edelstahlwerke Ag POT MAGNET.
US3535200A (en) * 1967-09-18 1970-10-20 Gen Motors Corp Multilayered mechanically oriented ferrite
FR2389968B1 (en) * 1977-05-02 1983-02-04 Burroughs Corp
JP2845643B2 (en) * 1991-07-22 1999-01-13 株式会社ソミック石川 Magnet device
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DE502007001423D1 (en) 2009-10-15
SI1821322T1 (en) 2010-01-29
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ATE441932T1 (en) 2009-09-15
HK1110988A1 (en) 2008-07-25

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