EP1668747B1 - Commutator for an electric machine - Google Patents

Commutator for an electric machine Download PDF

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Publication number
EP1668747B1
EP1668747B1 EP04735733A EP04735733A EP1668747B1 EP 1668747 B1 EP1668747 B1 EP 1668747B1 EP 04735733 A EP04735733 A EP 04735733A EP 04735733 A EP04735733 A EP 04735733A EP 1668747 B1 EP1668747 B1 EP 1668747B1
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EP
European Patent Office
Prior art keywords
commutator
laminations
electromagnetic radiation
commutator body
plastic
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Expired - Lifetime
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EP04735733A
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German (de)
French (fr)
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EP1668747A1 (en
Inventor
Tobias Kuechen
Claus Schmiederer
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Robert Bosch GmbH
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Robert Bosch GmbH
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Publication of EP1668747A1 publication Critical patent/EP1668747A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/04—Commutators
    • H01R39/06—Commutators other than with external cylindrical contact surface, e.g. flat commutators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/04—Commutators

Definitions

  • the invention is based on a commutator for an electric machine, in particular for an electric motor for actuators in motor vehicles, according to the preamble of claim 1.
  • a well-known commutator ( US Pat. No. 6,285,106 B1 ) has a rotatably attachable to the rotor shaft of a commutator, hollow cylindrical Kommutator emotions of insulating material, on the outer circumference of the commutator with gap spacing from each other in the circumferential direction are arranged side by side.
  • Each commutator blade integrally carries a terminal lug or hook for connecting the coils of a rotor winding, which is wrapped in a known manner in grooves of a rotatably seated on the rotor shaft, ferromagnetic rotor body.
  • the end of the front end facing away from the connection hooks is Commutator body incorporated a recess into which a suppressor, such as a varistor, is inserted so that its one annular disc surface rests against the bottom of the recess and the other, connecting electrodes bearing, annular disc surface facing outward.
  • a contact ring is pressed, which electrically connects the terminal electrodes with the commutator.
  • the contact ring has a base ring of insulating material with a plurality of respectively interconnected first and second contacts.
  • the number of first contacts and the number of second contacts corresponds in each case to the number of commutator bars or the same number of terminal electrodes on the suppressor plate.
  • a first contact rests on a connection electrode and in each case one standing in electrically conductive connection with the first contact second contact is located with mechanical bias on the underside of one of the ends of the recess projecting commutator.
  • a lid is pressed on the first contacts pressed against the terminal electrodes and is locked in the recess.
  • the commutator with the features of claim 1 has the advantage that the laying of the commutator bars on the inner circumferential surface of the commutator body designed as a hollow cylinder and the thus forcibly associated arrangement of the Commutator brushes in the interior of the commutator a fairly good shielding caused by the commutation electromagnetic interference is achieved by the commutator itself and additional components to reduce the sparking can be saved.
  • at least one front end of the hollow-cylindrical commutator body is closed off with a cover made of an electromagnetic radiation shielding or absorbing material.
  • the cover is provided with a central passage opening for the rotor shaft and serves to support the commutator on the rotor shaft of the electric machine.
  • the lid can also be made in one piece with the hollow cylindrical Kommutator emotions by this receives a cup shape.
  • the hollow cylindrical Kommutator emotions of a material that shields or absorbs electromagnetic radiation As a result, an additional attenuation of the electromagnetic interference radiation is achieved.
  • the commutator body is made of metal and an insulating layer is arranged between the commutator body and the commutator bars.
  • the commutator can also be made of plastic and the plastic magnetically and / or electrically conductive materials, such as steel fibers or carbon black, be added or enclosed by a metallic sleeve which shields electromagnetic radiation.
  • the in Fig. 1 A commutator shown in perspective for an electrical machine, in particular for an electric motor for actuators in vehicles, has a hollow cylindrical commutator 11 with an outer surface 111 and an inner circumferential surface 112.
  • the commutator 11 is made of an electrically insulating plastic and carries on its inner circumferential surface 112 a plurality of in the circumferential direction with gap spacing side by side arranged commutator 12, which extend over the entire axial length of the commutator 11.
  • Each commutator blade 12 carries at a fin end a connection lug or a connection hook 14 (FIG. Fig. 2 ). In the connection hooks 14, one of which in Fig. 3 is shown enlarged.
  • connection hooks 14 are pressed onto the commutator bars 12, and at the same time in the region of the connection hooks 14, the insulation of the armature winding wire is melted.
  • a lid 15 is placed and firmly connected to the commutator 11, for example by screwing or gluing.
  • the lid 15 is made of a material that shields or absorbs electromagnetic radiation.
  • the cover 15 has a central passage opening 16 for the rotor shaft 17 (FIG. Fig. 5
  • the lid 15 can also be made in one piece with the commutator 11 by the commutator 11 is cup-shaped, so that the lid 15 is formed by the cup bottom.
  • a brush holder 18 with two diametrically on the commutator 11 on the Commutator 12 arranged resting Kommutatorbürsten 19.
  • the brush holder 18 has a spatially fixed support ring 20 on which two brush holder 21 are arranged diametrically.
  • Each brush holder 21 receives a commutator brush 19 axially displaceable.
  • Each commutator brush 19 is pressed radially by means of a brush compression spring, not shown, on the commutator bars 12 and communicates with an electrical connecting wire 22 in electrically conductive connection.
  • sparks occur at each commutation, since during commutation, the coils of the armature or rotor winding are short-circuited for a very short period of time by the commutator 19 and then their short circuit is torn open again. From this sparking emanates electromagnetic interference radiation, which has a high-frequency interference component, which is generated by the forming electrostatic field, and a low-frequency interference component, which is generated by the magnetic field forming.
  • the cover 15 ensures that the electromagnetic radiation can not emerge from the commutator in the axial direction or only damped.
  • a layer 23 which further attenuates the electromagnetic interference due to their material property.
  • a layer 23 may be, for example, a metal sleeve.
  • the commutator body 11 is made of an electromagnetic radiation absorbing material for the enhanced attenuation of the electromagnetic interference radiation.
  • an electromagnetic radiation absorbing material for the enhanced attenuation of the electromagnetic interference radiation.
  • Such a material is obtained, for example, by adding admixtures of magnetically and / or electrically conductive materials to the plastic.
  • steel fibers are integrated in the plastic or carbon is added to the plastic in the form of carbon black.
  • the low-frequency interference components and in the second case the higher-frequency interference components of the electromagnetic interference radiation are further attenuated.
  • both components of the material can be added to the plastic.
  • the commutator 11 may also be made of metal, wherein between the commutator 11 and the commutator 12 an insulating layer is provided.
  • the cover 15 with its Störstrahlungsabsobierenden property is made of the same material as described above.

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  • Motor Or Generator Current Collectors (AREA)
  • Dc Machiner (AREA)

Abstract

Commutator for an electric machine, especially an electric motor for vehicle actuators. The commutator has commutator segments (12) mounted on a commutator body (11). The latter is configured as a hollow cylinder with the commutator segments being mounted around its inner jacket surface (112).

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Kommutator für eine elektrische Maschine, insbesondere für einen Elektromotor für Stellantriebe in Kraftfahrzeugen, nach dem Oberbegriff des Anspruchs 1.The invention is based on a commutator for an electric machine, in particular for an electric motor for actuators in motor vehicles, according to the preamble of claim 1.

Ein bekannter Kommutator ( US 6 285 106 B1 ) besitzt einen auf die Rotorwelle einer Kommutatormaschine drehfest aufsetzbaren, hohlzylindrischen Kommutatorkörper aus Isolierstoff, auf dessen Außenumfang die Kommutatorlamellen mit Spaltabstand voneinander in Umfangsrichtung nebeneinander angeordnet sind. Jede Kommutatorlamelle trägt einstückig eine Anschlussfahne oder -haken zum Anschließen der Spulen einer Rotorwicklung, die in bekannter Weise in Nuten eines drehfest auf der Rotorwelle sitzenden, ferromagnetischen Rotorkörper eingewickelt ist. Um beim Betrieb der Kommutatormaschine die bei der Kommutierung entstehende, für eine elektromagnetische Störstrahlung ursächliche Funkenbildung zu reduzieren, ist in das von den Anschlusshaken abgekehrte Stirnende des Kommutatorkörpers eine Vertiefung eingearbeitet, in die eine Entstörscheibe, z.B. ein Varistor, so eingelegt ist, dass ihre eine ringförmige Scheibenfläche am Grund der Vertiefung anliegt und die andere, Anschlusselektroden tragende, ringförmige Scheibenfläche nach außen weist. Auf die Entstörscheibe ist ein Kontaktring aufgedrückt, der die Anschlusselektroden mit dem Kommutatorlamellen elektrisch leitend verbindet. Der Kontaktring weist einen Basisring aus Isoliermaterial mit einer Vielzahl von jeweils miteinander verbundenen ersten und zweiten Kontakten auf. Die Anzahl der ersten Kontakte und die Anzahl der zweiten Kontakte entspricht jeweils der Zahl der Kommutatorlamellen bzw. der gleich großen Zahl der Anschlusselektroden an der Entstörscheibe. Jeweils ein erster Kontakt liegt auf einer Anschlusselektrode auf und jeweils ein mit dem ersten Kontakt in elektrisch leitender Verbindung stehender zweiter Kontakt liegt mit mechanischer Vorspannung an der Unterseite einer der endseitig über die Vertiefung vorstehenden Kommutatorlamellen an. Auf den Kontaktring ist ein Deckel aufgedrückt der die ersten Kontakte an die Anschlusselektroden andrückt und in der Vertiefung verrastet ist.A well-known commutator ( US Pat. No. 6,285,106 B1 ) has a rotatably attachable to the rotor shaft of a commutator, hollow cylindrical Kommutatorkörper of insulating material, on the outer circumference of the commutator with gap spacing from each other in the circumferential direction are arranged side by side. Each commutator blade integrally carries a terminal lug or hook for connecting the coils of a rotor winding, which is wrapped in a known manner in grooves of a rotatably seated on the rotor shaft, ferromagnetic rotor body. In order to reduce the sparking that occurs during commutation during operation of the commutator machine, which is the cause of electromagnetic interference radiation, the end of the front end facing away from the connection hooks is Commutator body incorporated a recess into which a suppressor, such as a varistor, is inserted so that its one annular disc surface rests against the bottom of the recess and the other, connecting electrodes bearing, annular disc surface facing outward. On the suppressor a contact ring is pressed, which electrically connects the terminal electrodes with the commutator. The contact ring has a base ring of insulating material with a plurality of respectively interconnected first and second contacts. The number of first contacts and the number of second contacts corresponds in each case to the number of commutator bars or the same number of terminal electrodes on the suppressor plate. In each case, a first contact rests on a connection electrode and in each case one standing in electrically conductive connection with the first contact second contact is located with mechanical bias on the underside of one of the ends of the recess projecting commutator. On the contact ring, a lid is pressed on the first contacts pressed against the terminal electrodes and is locked in the recess.

Weiterhin sind aus der DE 743 900 C und der DE 206 716 C ensprechend dem Oberbegriff des Anspruchs 1 ausgeführte Kommutatoren mit innenliegenden Kommutatorlamellen und einem als Isolierrohr gebildeten Kommutatorkörper bekannt.Furthermore, from the DE 743 900 C and the DE 206 716 C According to the preamble of claim 1 executed commutators with internal commutator and a commutator formed as insulating commutator known.

Vorteile der ErfindungAdvantages of the invention

Der Kommutator mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass durch die verlegung der Kommutatorlamellen auf die innere Mantelfläche des als Hohlzylinder ausgebildeten Kommutatorkörpers und der damit zwangsweise einhergehenden Anordnung der Kommutatorbürsten im Innern des Kommutators eine recht gute Abschirmung der bei der Kommutierung hervorgerufenen elektromagnetischen Störstrahlung durch den Kommutator selbst erzielt wird und zusätzliche Bauelemente zur Reduktion der Funkenbildung eingespart werden können. Erfindungsgemäß ist vorgesehen, dass mindestens ein Stirnende des hohlzylindrischen Kommutatorkörpers mit einem Deckel aus einem elektromagnetische Strahlung abschirmenden bzw. absorbierenden Material abgeschlossen ist. Der Deckel ist mit einer zentralen Durchgangsöffnung für die Rotorwelle versehen und dient zur Abstützung des Kommutators auf der Rotorwelle der elektrischen Maschine. Der Deckel kann auch einstückig mit dem hohlzylindrischen Kommutatorkörper ausgeführt werden, indem dieser eine Becherform erhält.The commutator with the features of claim 1 has the advantage that the laying of the commutator bars on the inner circumferential surface of the commutator body designed as a hollow cylinder and the thus forcibly associated arrangement of the Commutator brushes in the interior of the commutator a fairly good shielding caused by the commutation electromagnetic interference is achieved by the commutator itself and additional components to reduce the sparking can be saved. According to the invention, it is provided that at least one front end of the hollow-cylindrical commutator body is closed off with a cover made of an electromagnetic radiation shielding or absorbing material. The cover is provided with a central passage opening for the rotor shaft and serves to support the commutator on the rotor shaft of the electric machine. The lid can also be made in one piece with the hollow cylindrical Kommutatorkörper by this receives a cup shape.

Durch die in den Ansprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des im Anspruch 1 angegebenen Kommutators möglich.The measures listed in the claims advantageous refinements and improvements of the claim 1 commutator are possible.

Gemäß einer bevorzugten Ausführungsform der Erfindung besteht der hohlzylindrische Kommutatorkörper aus einem Material, das elektromagnetische Strahlung abschirmt bzw. absorbiert. Dadurch wird noch eine zusätzliche Bedämpfung der elektromagnetischen Störstrahlung erreicht. Beispielsweise besteht der Kommutatorkörper aus Metall und zwischen dem Kommutatorkörper und den Kommutatorlamellen ist eine Isolierschicht angeordnet. Der Kommutatorkörper kann aber auch aus Kunststoff gefertigt werden und dem Kunststoff magnetisch und/oder elektrisch leitende Materialien, wie Stahlfasern oder Ruß, beigemengt werden oder von einer metallischen Hülse, die elektromagnetische Strahlung abschirmt, umschlossen sein.According to a preferred embodiment of the invention, the hollow cylindrical Kommutatorkörper of a material that shields or absorbs electromagnetic radiation. As a result, an additional attenuation of the electromagnetic interference radiation is achieved. By way of example, the commutator body is made of metal and an insulating layer is arranged between the commutator body and the commutator bars. The commutator can also be made of plastic and the plastic magnetically and / or electrically conductive materials, such as steel fibers or carbon black, be added or enclosed by a metallic sleeve which shields electromagnetic radiation.

Zeichnungdrawing

Die Erfindung ist anhand von in der Zeichnung dargestellten Ausführungsbeispielen in der nachfolgenden Beschreibung näher erläutert. Es zeigen:

Fig. 1
eine perspektivische Darstellung eines Kommutators für eine Kommutatormaschine,
Fig. 2
eine Ansicht des Kommutators in Richtung Pfeil II in Fig. 1,
Fig. 3
eine vergrößerte perspektivische Darstellung eines Anschlusshakens des Kommutators in Fig. 2,
Fig. 4
eine perspektivische Darstellung eines Deckels zum Abdecken des Stirnendes des Kommutators in Fig. 1,
Fig. 5
einen Querschnitt des Kommutators gemäß einem weiteren Ausführungsbeispiel,
The invention is explained in more detail with reference to embodiments illustrated in the drawings in the following description. Show it:
Fig. 1
a perspective view of a commutator for a commutator,
Fig. 2
a view of the commutator in the direction of arrow II in Fig. 1 .
Fig. 3
an enlarged perspective view of a connection hook of the commutator in Fig. 2 .
Fig. 4
a perspective view of a lid for covering the front end of the commutator in Fig. 1 .
Fig. 5
a cross section of the commutator according to another embodiment,

Beschreibung der AusführungsbeispieleDescription of the embodiments

Der in Fig. 1 perspektivisch dargestellte Kommutator für eine elektrische Maschine, insbesondere für einen Elektromotor für Stellantriebe bei Fahrzeugen, weist einen hohlzylindrischen Kommutatorkörper 11 mit einer äußeren Mantelfläche 111 und einer inneren Mantelfläche 112 auf. Der Kommutatorkörper 11 besteht aus einem elektrisch isolierenden Kunststoff und trägt auf seiner inneren Mantelfläche 112 eine Vielzahl von in Umfangsrichtung mit Spaltabstand nebeneinander angeordneten Kommutatorlamellen 12, die sich über die gesamte axiale Länge des Kommutatorkörpers 11 erstrecken. Jede Kommutatorlamelle 12 trägt an einem Lamellenende eine Anschlussfahne oder einen Anschlusshaken 14 (Fig. 2). In die Anschlusshaken 14, von denen einer in Fig. 3 vergrößert dargestellt ist. werden in bekannter Weise die Spulen einer Anker- oder Rotorwicklung eingehängt und mit diesen mechanisch und elektrisch verbunden. Die Verbindung erfolgt üblicherweise im sog. Hot-Stacking, einem Heisspressverfahren, bei dem die Anschlusshaken 14 auf die Kommutatorlamellen 12 aufgedrückt werden, und dabei gleichzeitig im Bereich der Anschlusshaken 14 die Isolation des Ankerwicklungsdrahts abgeschmolzen wird.The in Fig. 1 A commutator shown in perspective for an electrical machine, in particular for an electric motor for actuators in vehicles, has a hollow cylindrical commutator 11 with an outer surface 111 and an inner circumferential surface 112. The commutator 11 is made of an electrically insulating plastic and carries on its inner circumferential surface 112 a plurality of in the circumferential direction with gap spacing side by side arranged commutator 12, which extend over the entire axial length of the commutator 11. Each commutator blade 12 carries at a fin end a connection lug or a connection hook 14 (FIG. Fig. 2 ). In the connection hooks 14, one of which in Fig. 3 is shown enlarged. be hung in a known manner, the coils of an armature or rotor winding and connected to these mechanically and electrically. The connection is usually carried out in the so-called hot-stacking, a hot pressing process in which the connection hooks 14 are pressed onto the commutator bars 12, and at the same time in the region of the connection hooks 14, the insulation of the armature winding wire is melted.

Auf das von den Anschlusshaken 14 abgekehrte Stirnende des Kommutatorkörpers 11 ist ein Deckel 15 aufgesetzt und mit dem Kommutatorkörper 11, z.B. durch Verschraubung oder Verkleben fest verbunden. Der Deckel 15 besteht aus einem Material, der elektromagnetische Strahlungen abschirmt oder absorbiert. Der Deckel 15 besitzt eine zentrale Durchtrittsöffnung 16 für die Rotorwelle 17 (Fig. 5) und dient zur drehfesten und axial unverschieblichen Abstützung des Kommutators auf der Rotorwelle 17. Der Deckel 15 kann auch einstückig mit dem Kommutatorkörper 11 ausgeführt werden, indem der Kommutatorkörper 11 becherförmig ausgebildet wird, so dass der Deckel 15 von dem Becherboden gebildet ist.On the side facing away from the connection hooks 14 front end of the commutator 11, a lid 15 is placed and firmly connected to the commutator 11, for example by screwing or gluing. The lid 15 is made of a material that shields or absorbs electromagnetic radiation. The cover 15 has a central passage opening 16 for the rotor shaft 17 (FIG. Fig. 5 The lid 15 can also be made in one piece with the commutator 11 by the commutator 11 is cup-shaped, so that the lid 15 is formed by the cup bottom.

Wie aus der Schnittdarstellung in Fig. 5 zu erkennen ist, in der noch die geschnittene Rotorwelle 17 eingezeichnet ist, ist im Innern des Kommutatorkörpers 11 ein Bürstenhalter 18 mit zwei diametral am Kommutatorkörper 11 auf den Kommutatorlamellen 12 aufliegenden Kommutatorbürsten 19 angeordnet. Der Bürstenhalter 18 weist einen räumlich feststehenden Tragring 20 auf, an dem zwei Bürstenköcher 21 diametral angeordnet sind. Jeder Bürstenköcher 21 nimmt eine Kommutatorbürste 19 axial verschieblich auf. Jede Kommutatorbürste 19 wird mittels einer nicht dargestellten Bürstenandruckfeder radial auf die Kommutatorlamellen 12 gedrückt und steht mit einer elektrischen Anschlusslitze 22 in elektrisch leitender Verbindung.As from the sectional view in Fig. 5 can be seen in the still cut rotor shaft 17 is located inside the commutator 11 is a brush holder 18 with two diametrically on the commutator 11 on the Commutator 12 arranged resting Kommutatorbürsten 19. The brush holder 18 has a spatially fixed support ring 20 on which two brush holder 21 are arranged diametrically. Each brush holder 21 receives a commutator brush 19 axially displaceable. Each commutator brush 19 is pressed radially by means of a brush compression spring, not shown, on the commutator bars 12 and communicates with an electrical connecting wire 22 in electrically conductive connection.

Beim Betrieb eines mit einem solchen Kommutator ausgestatteten elektrischen Motors, z. B. eines Gleichstrommotors, entstehen bei jeder Kommutierung Funken, da beim Kommutieren die Spulen der Anker- oder Rotorwicklung für eine sehr kurze Zeitspanne von den Kommutatorbürsten 19 kurzgeschlossen werden und dann deren Kurzschluss wieder aufgerissen wird. Von dieser Funkenbildung geht eine elektromagnetische Störstrahlung aus, die einen hochfrequenten Störanteil, der durch das sich bildende elektrostatische Feld erzeugt wird, und einen niederfrequenten Störanteil, der durch das sich bildende magnetische Feld erzeugt wird, aufweist. Durch die hier vorgenommene Verlagerung der Kommutatorlamellen 12 und des Bürstenhalters 18 in das Innere des Kommutatorkörpers 11 wird ein großer Teil dieser elektromagnetischen Störstrahlung durch den Kommutator selbst abgeschirmt. Der Deckel 15 sorgt dafür, dass die elektromagnetische Strahlung auch in Achsrichtung nicht oder nur bedämpft aus dem Kommutator austreten kann.In the operation of an electric motor equipped with such a commutator, e.g. As a DC motor, sparks occur at each commutation, since during commutation, the coils of the armature or rotor winding are short-circuited for a very short period of time by the commutator 19 and then their short circuit is torn open again. From this sparking emanates electromagnetic interference radiation, which has a high-frequency interference component, which is generated by the forming electrostatic field, and a low-frequency interference component, which is generated by the magnetic field forming. As a result of the displacement of the commutator bars 12 and of the brush holder 18 into the interior of the commutator body 11, a large part of this electromagnetic interference radiation is shielded by the commutator itself. The cover 15 ensures that the electromagnetic radiation can not emerge from the commutator in the axial direction or only damped.

Wird ein noch höher Entstörungsgrad gefordert, so wird - wie dies in Fig. 5 dargestellt ist - die äußerte Mantelfläche 111 des Kommutatorkörpers 11 mit einer Schicht 23 versehen, die aufgrund ihrer Materialeigenschaft die elektromagnetische Störstrahlung noch weitergehend bedämpft. Eine solche Schicht 23 kann beispielsweise eine Metallhülse sein.If an even higher degree of interference suppression is required, then - as in Fig. 5 is shown - the expressed lateral surface 111th of the commutator 11 is provided with a layer 23, which further attenuates the electromagnetic interference due to their material property. Such a layer 23 may be, for example, a metal sleeve.

In einem alternativen Ausführungsbeispiel ist für die verstärkte Bedämpfung der elektromagnetischen Störstrahlung der Kommutatorkörper 11 aus einem elektromagnetische Strahlung absorbierenden Material hergestellt. Ein solches Material wird beispielsweise dadurch gewonnen, dass dem Kunststoff Beimengungen von magnetisch und/oder elektrisch leitfähigen Materialien zugegeben wird. Beispielsweise sind im Kunststoff Stahlfasern integriert oder ist dem Kunststoff Kohlenstoff in Form von Ruß beigemischt. Im ersten Fall werden die niederfrequenten Störanteile und im zweiten Fall die höherfrequenten Störanteile der elektromagnetischen Störstrahlung weitergehend bedämpft. Selbstverständlich können auch beide Materialkomponenten dem Kunststoff zugemischt werden. Der Kommutatorkörper 11 kann auch aus Metall bestehen, wobei zwischen dem Kommutatorkörper 11 und den Kommutatorlamellen 12 eine Isolierschicht vorzusehen ist.In an alternative embodiment, the commutator body 11 is made of an electromagnetic radiation absorbing material for the enhanced attenuation of the electromagnetic interference radiation. Such a material is obtained, for example, by adding admixtures of magnetically and / or electrically conductive materials to the plastic. For example, steel fibers are integrated in the plastic or carbon is added to the plastic in the form of carbon black. In the first case, the low-frequency interference components and in the second case the higher-frequency interference components of the electromagnetic interference radiation are further attenuated. Of course, both components of the material can be added to the plastic. The commutator 11 may also be made of metal, wherein between the commutator 11 and the commutator 12 an insulating layer is provided.

Der Deckel 15 mit seiner störstrahlungsabsobierenden Eigenschaft wird aus dem gleichen Material wie vorstehend beschrieben hergestellt.The cover 15 with its Störstrahlungsabsobierenden property is made of the same material as described above.

Claims (10)

  1. Commutator for an electrical machine, in particular for an electric motor for actuating drives in vehicles, having a commutator body (11) which has commutator laminations (12), with the commutator body (11) being a hollow cylinder and the commutator laminations (12) being arranged on the inner circumferential surface (112) of the commutator body (11), characterized in that at least one end of the hollow-cylindrical commutator body (11) is covered by a cover (15) made of a material which screens electromagnetic radiation.
  2. Commutator according to Claim 1, characterized in that the commutator body (11) is composed of an electrically insulating plastic.
  3. Commutator according to Claim 1, characterized in that the commutator body (11) is composed of a material which screens electromagnetic radiation.
  4. Commutator according to Claim 1, characterized in that the commutator body (11) is composed of metal and an electrical insulation layer is arranged between the commutator body (11) and the commutator laminations (12).
  5. Commutator according to Claim 2, characterized in that the commutator body (11) has a layer (23) which screens electromagnetic radiation on its outer circumferential surface (111).
  6. Commutator according to Claim 3, characterized in that the commutator body (11) is composed of plastic with additions of a magnetically permeable and/or electrically conductive material.
  7. Commutator according to Claim 6, characterized in that the additions contain steel fibres.
  8. Commutator according to Claim 6 or 7, characterized in that the additions contain carbon.
  9. Commutator according to Claim 8, characterized in that the carbon is added in the form of carbon black.
  10. Commutator according to one of Claims 1-9, characterized in that at least two commutator brushes (19) which are pressed radially onto the commutator laminations (12) are arranged in a fixed manner in relation to the commutator body (11) in the interior of the commutator body (11).
EP04735733A 2003-08-21 2004-06-02 Commutator for an electric machine Expired - Lifetime EP1668747B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10338450A DE10338450A1 (en) 2003-08-21 2003-08-21 Commutator for an electric machine, especially an electric motor for vehicle actuators, has a hollow cylindrical commutator body with commutator segments mounted around its inner jacket surface
PCT/DE2004/001119 WO2005027280A1 (en) 2003-08-21 2004-06-02 Commutator for an electric machine

Publications (2)

Publication Number Publication Date
EP1668747A1 EP1668747A1 (en) 2006-06-14
EP1668747B1 true EP1668747B1 (en) 2009-04-15

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EP04735733A Expired - Lifetime EP1668747B1 (en) 2003-08-21 2004-06-02 Commutator for an electric machine

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US (1) US7375452B2 (en)
EP (1) EP1668747B1 (en)
JP (1) JP4733032B2 (en)
CN (1) CN100401596C (en)
AT (1) ATE429050T1 (en)
DE (2) DE10338450A1 (en)
ES (1) ES2322466T3 (en)
WO (1) WO2005027280A1 (en)

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US20090051236A1 (en) * 2007-08-24 2009-02-26 Harald Klode DC motor, brush holder for DC motor, and system including DC motor
DE102008040717A1 (en) * 2008-07-25 2010-01-28 Robert Bosch Gmbh Commutator for an electric machine as well as system
WO2011005039A2 (en) * 2009-07-09 2011-01-13 Park Jae-Soon Apparatus for generating alternating current power by direct current supply brush that rotates with field pole generator, and apparatus for generating direct current power
US9450366B2 (en) * 2010-10-26 2016-09-20 University Of Florida Research Foundation, Inc. Long-life metal sliding contacts
CN103166411B (en) * 2011-12-12 2016-09-07 德昌电机(深圳)有限公司 Brush motor and use the fan of this brush motor
CN103633782B (en) * 2012-08-20 2017-09-01 德昌电机(深圳)有限公司 Motor and its end-cap assembly
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CN113472143B (en) * 2021-08-12 2022-09-02 浙江东方机电有限公司 Anti-interference high-speed motor with stable operation

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CN100401596C (en) 2008-07-09
ATE429050T1 (en) 2009-05-15
DE10338450A1 (en) 2005-03-24
US7375452B2 (en) 2008-05-20
JP4733032B2 (en) 2011-07-27
EP1668747A1 (en) 2006-06-14
ES2322466T3 (en) 2009-06-22
US20060082244A1 (en) 2006-04-20
WO2005027280A1 (en) 2005-03-24
CN1813380A (en) 2006-08-02
DE502004009365D1 (en) 2009-05-28
JP2007503192A (en) 2007-02-15

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