EP2947324B1 - Electric motor vehicle auxiliary unit - Google Patents

Electric motor vehicle auxiliary unit Download PDF

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Publication number
EP2947324B1
EP2947324B1 EP14169479.4A EP14169479A EP2947324B1 EP 2947324 B1 EP2947324 B1 EP 2947324B1 EP 14169479 A EP14169479 A EP 14169479A EP 2947324 B1 EP2947324 B1 EP 2947324B1
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EP
European Patent Office
Prior art keywords
board body
auxiliary unit
motor vehicle
circuit board
vehicle auxiliary
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP14169479.4A
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German (de)
French (fr)
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EP2947324A1 (en
Inventor
Peter Gross
Axel Doerrer
Jacob Ruszczyk
Reinhard Gootz
Robin Eskes
Ronny Marzog
Stephan Riefers
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Pierburg Pump Technology GmbH
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Pierburg Pump Technology GmbH
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Publication date
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Priority to EP14169479.4A priority Critical patent/EP2947324B1/en
Publication of EP2947324A1 publication Critical patent/EP2947324A1/en
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Publication of EP2947324B1 publication Critical patent/EP2947324B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0686—Mechanical details of the pump control unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5813—Cooling the control unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps

Definitions

  • the invention relates to an electrical auxiliary motor unit which has an electric drive motor which is designed as an electronically commutated canned motor.
  • the vehicle accessory may be, for example, a liquid pump, a vacuum pump or a controller.
  • the canned motor offers the advantage that leakage through a shaft seal can not occur due to the design.
  • a mechanical commutation is out of the question, so that there is always an electronic motor control is present, which energizes the stator coils.
  • EP 0 778 649 A1 discloses a motor vehicle fluid pump wherein the motor controller is disposed on an annular board body axially and radially fixed by a stepped retainer sleeve.
  • Out EP 2 476 914 A1 is a trained as a coolant pump automotive accessory known in which the drive motor has a lying in a transverse plane partition through which the electronic engine control liquid-tight from the motor rotor, which is located on the wet side, is separated.
  • the power semiconductors of the motor control are arranged on the proximal side of a platinum body lying in a transverse plane.
  • the proximal side of the board body has traces, which rest directly on the partition wall for good heat dissipation.
  • corresponding recesses are provided in the dividing wall. The preparation of the partition is thereby very complex.
  • the object of the invention is to provide an electric motor vehicle accessory with an electronically commutated canned drive motor, in which the motor control is fixed in a low-cost manner with high operational reliability.
  • the motor vehicle accessory according to the invention has a partition with at least two axial support nubs, which project axially in the distal direction of the partition, ie in the direction of the board body of the engine control.
  • the support knobs are not used to attach the board body to the partition, but only the spacing.
  • at least one fastening element is provided by which the board body is held axially on the partition wall, by which the board body is thus pulled axially in the direction of the partition wall and held thereon.
  • a single fastener is provided.
  • the mounting of the motor control on the partition is easy, since only a single fastener has to be applied and fixed.
  • the exact axial arrangement of the board body, which is usually arranged in a transverse plane and arranged approximately parallel to the dividing wall, is set substantially by the supporting knobs.
  • the partition has three axial support knobs, so that in this way already a tilt-free spacing of the entire board body is ensured with respect to the partition wall before the fastener is applied.
  • the three support knobs are not arranged in a line to each other, but form the three corners of a triangle as equilateral as possible.
  • the proximal board body side is coated with conductor tracks, thus has a conductor track coating.
  • the trace coating respectively, the entire
  • the proximal board body side is preferably also coated with an electrically non-conductive lacquer layer.
  • a coating-free zone is provided in each case, which is free of conductor tracks.
  • a car accessory is constantly exposed to third-party and self-generated vibrations and shocks. Since the board body is only supported in the region of the support points on the supporting knobs, but can move freely radially in principle, occur at the support points inevitably radial relative movements. As a result, material is removed in the form of abrasion on the proximal board body side.
  • the coating-free zones have a minimum radial extension of at least 4.0 mm, and more preferably of at least 6.0 mm. As a result, it is ensured even with relatively large radial relative movements between the board body and the partition that no Anthonybahnabrieb is generated.
  • the support knobs can be fastened as separate elements on the dividing wall, so that in this constellation, a different material can be selected for the supporting knobs than for the dividing wall.
  • the support knobs are formed integrally with the partition wall.
  • the support knobs are then made of the same material as the partition, which is often aluminum in practice.
  • the support knobs are made of a relatively hard material, namely usually made of aluminum.
  • the provision of a coating-free zone in the region of the support points is of particular importance, since the abrasion at the support points comes almost exclusively from the sinker body and its coatings.
  • the motor controller has a plurality of power semiconductors for driving the motor coils, wherein the power semiconductors are arranged on conductor tracks on the proximal board body side, ie on the side which is oriented to the motor rotor. Due to the spacing of the board body from the partition wall produced by the supporting knobs, the proximal board body side can also be easily equipped with components. Particularly suitable for this purpose is the placement with the power semiconductors, since they can be cooled in this way over relatively short distances and with the lowest possible heat conduction resistance on the partition, which in turn is effectively cooled by the liquid from the wet side in the case of a liquid pump ,
  • thermal conduction material is provided between a conductor track on the proximal board body side and the partition wall, by means of which the heat is dissipated from the proximal conductor tracks with a relatively low heat conduction resistance to the partition wall.
  • This is particularly helpful when the power semiconductors are applied to large-area conductor tracks, so that in this way a lot of heat from the power semiconductors via the conductor tracks and the over a relatively short path with relatively low thermal resistance Thermal compound can be dissipated to the partition.
  • the thermal mass does not have to carry any supporting or fixing function here.
  • the fastening element is formed by a screw, through which the board body is tensioned in the direction of the partition wall.
  • a rotational fixation of the board can alternatively or additionally be ensured by a corresponding positive connection on the outer edge of the board body on the one hand and the inside of the motor housing or frame on the other hand.
  • a support sleeve is provided between the proximal board body side and the partition, which radially surrounds the fastening element, so that the board body is axially supported by the support sleeve.
  • the support sleeve may be formed integrally with the fastening element, but is preferably a separate element.
  • the support sleeve and the fastener may be electrically conductive, and can in this way produce a reliable ground connection between ground traces on both sides of the board body on the one hand and the partition on the other.
  • the axial length of the support sleeve is smaller than the axial length of the support knobs, wherein the difference is at most in the single-digit millimeter range.
  • an axial bias of the board body can be adjusted with respect to the partition. Due to the bias prevents the board in the area of Stitznoppen- support points by vibrations briefly lifts off the support knobs and then hits back on the support knobs.
  • FIG. 1 An electric motor vehicle accessory 10 is shown, which in the present case is designed as a motor vehicle coolant pump.
  • the vehicle accessory 10 includes an electric drive motor 12 which drives an impeller impeller 16.
  • the drive motor 12 is designed as a so-called canned drive motor.
  • the electronically commutated Drive motor 12 has an external bespulten motor stator 20 which is liquid-tightly separated by a cylindrical can 18 from a permanent magnet motor rotor 15 which is fixed in rotation on a rotor shaft 14.
  • the impeller 16 is fixed in rotation on the rotor shaft 14.
  • the rotor shaft 20 rotates about a drive motor axial Z.
  • the motor stator 20 has a guide body 22 and a plurality of stator coils 24 which are wound on the guide body 22.
  • the brushless drive motor 12 has an electronic motor control 50, which performs the electronic commutation and through which the stator coils 24 are supplied with electrical energy.
  • the drive motor 12 has a multi-part housing 26, which carries the can 18 and the motor stator 20 and the motor controller 50 surrounds and shields.
  • a partition wall 30 is provided in a transverse plane, which carries the can 18 in an annular groove. Further, in an axial recess on the wet side of the partition wall 30, a shaft bearing 32 is provided, through which the rotor shaft 14 is rotatably mounted.
  • the partition wall 30 separates in particular a wet space in which the motor rotor 15 is arranged, liquid-tight from a drying space in which the motor control 50 is arranged.
  • the motor controller 50 is disposed in a dry control room.
  • the engine controller 50 is essentially formed by a both sides with active and passive electronic components 56,62 populated board body 52 which is arranged in a transverse plane, ie transverse to the drive motor axial Z.
  • the board body 52 On the distal side of the partition wall 30, in the area covered by the board body 52, there are provided three axial support knobs 34, 35 which are arranged approximately to form the vertices of an equilateral triangle whose center is approximately the drive motor axial Z.
  • the support nubs 34,35 are integrally formed with the existing partition wall 30 made of aluminum.
  • the board body 52 has on both sides of conductor tracks 54,60, which are present in the present case only as a homogeneous interconnect layer.
  • the tracks 54,60 electrically connect the electronic components 62,56 each other.
  • a plurality of power semiconductors 56 are applied as electronic components.
  • the power semiconductors 56 supply the stator coils 24 with electrical energy via corresponding electrical supply lines 64.
  • a coating-free zone 57 is provided, which is free of conductor tracks.
  • the coating-free zone 57 is present approximately circular in shape and has a diameter of 5-6 mm.
  • a fastening element 40 is provided, which is presently formed by a screw which is inserted through a corresponding central opening or axial bore of the board body 52 and screwed into a corresponding threaded bore of the partition 30.
  • an annular support sleeve 42 is provided which radially surrounds the fastening element 40 and defines the axial distance between the sinker body 52 and the partition wall 30 in the region of the fastening element 40.
  • the axial length of the support sleeve 42 is 1-3 mm less than the axial length of the support nubs 34,35, so that the sinker body center is axially biased.
  • a thermally conductive compound 58 In an annular region around the fastening element 40 and the support sleeve 42 around the conductor tracks 54 on the one hand and the partition wall 30 on the other hand are thermally connected to each other by a thermally conductive compound 58 axially.
  • the heat conducting compound 58 is arranged annularly around the axial Z and around the fastening element 40. The heat generated by the power semiconductors 56 is dissipated via the conductor tracks carrying them and the heat conducting compound 58 onto the aluminum partition wall 30, which is actively cooled on its proximal side by the delivery liquid in the wet space.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)

Description

Die Erfindung bezieht sich auf ein elektrisches Kfz-Nebenaggregat, das einen elektrischen Antriebsmotor aufweist, der als elektronisch kommutierter Spaltrohrmotor ausgebildet ist.The invention relates to an electrical auxiliary motor unit which has an electric drive motor which is designed as an electronically commutated canned motor.

Das Kfz-Nebenaggregat kann beispielsweise eine Flüssigkeitspumpe, eine Vakuumpumpe oder ein Steller sein. Insbesondere bei einer Flüssigkeitspumpe bietet der Spaltrohrmotor den Vorteil, dass eine Leckage über eine Wellendichtung konstruktionsbedingt nicht auftreten kann. Bei einem Spaltrohrmotor kommt eine mechanische Kommutierung nicht in Frage, so dass stets eine elektronische Motorsteuerung vorhanden ist, die die Statorspulen bestromt.The vehicle accessory may be, for example, a liquid pump, a vacuum pump or a controller. Particularly in the case of a liquid pump, the canned motor offers the advantage that leakage through a shaft seal can not occur due to the design. In a canned motor, a mechanical commutation is out of the question, so that there is always an electronic motor control is present, which energizes the stator coils.

EP 0 778 649 A1 offenbart eine KFZ-Flüssigkeitspumpe, bei der die Motorsteuerung auf einem ringförmigen Platinenkörper angeordnet ist, der durch eine gestufte Halterhülse axial und radial fixiert ist. EP 0 778 649 A1 discloses a motor vehicle fluid pump wherein the motor controller is disposed on an annular board body axially and radially fixed by a stepped retainer sleeve.

Aus GB 2496014 A ist eine elektrische Pumpe bekannt, bei der die Motorsteuerungs-Platine von einem gestuften Haltebolzen an einer Trennwand gehalten wird.Out GB 2496014 A An electric pump is known in which the motor control board is held by a stepped retaining bolt on a partition wall.

Aus DE 10 2007 054 060 A1 ist eine Flüssigkeitspumpe bekannt, bei der die Platine durch ringförmige gummielastische Schichtelemente thermisch an einer Trennwand angebunden ist.Out DE 10 2007 054 060 A1 is a liquid pump is known in which the board is connected by annular rubber-elastic layer elements thermally connected to a partition wall.

Aus EP 2 476 914 A1 ist ein als Kühlmittelpumpe ausgebildetes Kfz-Nebenaggregat bekannt, bei dem der Antriebsmotor eine in einer Querebene liegende Trennwand aufweist, durch die die elektronische Motorsteuerung flüssigkeitsdicht von dem Motorrotor, der sich auf der Nassseite befindet, abgetrennt ist. Die Leistungshalbleiter der Motorsteuerung sind auf der proximalen Seite eines in einer Querebene liegenden Platinenkörpers angeordnet. Die proximale Seite des Platinenkörpers weist Leiterbahnen auf, die für eine gute Wärmeableitung unmittelbar auf der Trennwand aufliegen. Für die auf der proximalen Seite angeordneten Leistungshalbleiter sind entsprechende Ausnehmungen in der Trennwand vorgesehen. Die Herstellung der Trennwand ist hierdurch sehr aufwändig.Out EP 2 476 914 A1 is a trained as a coolant pump automotive accessory known in which the drive motor has a lying in a transverse plane partition through which the electronic engine control liquid-tight from the motor rotor, which is located on the wet side, is separated. The power semiconductors of the motor control are arranged on the proximal side of a platinum body lying in a transverse plane. The proximal side of the board body has traces, which rest directly on the partition wall for good heat dissipation. For the power semiconductors arranged on the proximal side, corresponding recesses are provided in the dividing wall. The preparation of the partition is thereby very complex.

Aufgabe der Erfindung ist es, ein elektrisches Kfz-Nebenaggregat mit einem elektronisch kommutierten Spaltrohr-Antriebsmotor zu schaffen, bei dem die Motorsteuerung auf preiswerte Weise bei hoher Betriebszuverlässigkeit fixiert ist.The object of the invention is to provide an electric motor vehicle accessory with an electronically commutated canned drive motor, in which the motor control is fixed in a low-cost manner with high operational reliability.

Diese Aufgabe wird erfindungsgemäß gelöst mit einem Kfz-Nebenaggregat mit den Merkmalen des Anspruchs 1.This object is achieved with a motor vehicle accessory with the features of claim 1.

Das erfindungsgemäße Kfz-Nebenaggregat weist eine Trennwand mit mindestens zwei axialen Stütznoppen auf, die in distaler Richtung von der Trennwand axial emporragen, also in Richtung des Platinenkörpers der Motorsteuerung. Die Stütznoppen dienen nicht der Befestigung des Platinenkörpers an der Trennwand, sondern nur der Beabstandung. Ferner ist mindestens ein Befestigungselement vorgesehen, durch das der Platinenkörper axial an der Trennwand festgehalten wird, durch das der Platinenkörper also axial in Richtung der Trennwand gezogen und an dieser festgehalten wird. Besonders bevorzugt ist ein einziges Befestigungselement vorgesehen.The motor vehicle accessory according to the invention has a partition with at least two axial support nubs, which project axially in the distal direction of the partition, ie in the direction of the board body of the engine control. The support knobs are not used to attach the board body to the partition, but only the spacing. Furthermore, at least one fastening element is provided by which the board body is held axially on the partition wall, by which the board body is thus pulled axially in the direction of the partition wall and held thereon. Particularly preferred is a single fastener is provided.

Die Montage der Motorsteuerung an der Trennwand ist einfach, da nur ein einziges Befestigungselement appliziert und fixiert werden muss. Die exakte axiale Anordnung des Platinenkörpers, der in der Regel in einer Querebene stehend und ungefähr parallel zu der Trennwand angeordnet ist, wird im Wesentlichen durch die Stütznoppen eingestellt.The mounting of the motor control on the partition is easy, since only a single fastener has to be applied and fixed. The exact axial arrangement of the board body, which is usually arranged in a transverse plane and arranged approximately parallel to the dividing wall, is set substantially by the supporting knobs.

Besonders bevorzugt weist die Trennwand drei axiale Stütznoppen auf, so dass hierdurch bereits eine kippfreie Beabstandung des gesamten Platinenkörpers im Bezug auf die Trennwand sichergestellt ist, bevor das Befestigungselement appliziert wird. Die drei Stütznoppen sind hierzu nicht in einer Linie zueinander angeordnet, sondern bilden die drei Ecken eines möglichst gleichseitigen Dreiecks.Particularly preferably, the partition has three axial support knobs, so that in this way already a tilt-free spacing of the entire board body is ensured with respect to the partition wall before the fastener is applied. The three support knobs are not arranged in a line to each other, but form the three corners of a triangle as equilateral as possible.

Gemäß einer bevorzugten Ausgestaltung ist die proximale Platinenkörper-Seite mit Leiterbahnen beschichtet, weist also eine Leiterbahn-Beschichtung auf. Die Leiterbahn-Beschichtung bzw, die gesamte proximale Platinenkörper-Seite ist bevorzugt ferner mit einer elektrisch nicht-leitenden Lackschicht beschichtet. An allen Auflagepunkten, an denen der Platinenkörper jeweils auf den Stütznoppen aufliegt, ist jeweils eine beschichtungsfreie Zone vorgesehen, die leiterbahnfrei ist. Ein Kfz-Nebenaggregat ist ständig fremderzeugten und selbsterzeugten Vibrationen und Erschütterungen ausgesetzt. Da der Platinenkörper im Bereich der Auflagepunkte an den Stütznoppen nur abgestützt ist, jedoch sich radial im Prinzip frei bewegen kann, treten an den Auflagepunkten unvermeidlich radiale Relativbewegungen auf. Hierdurch wird auf der proximalen Platinenkörper-Seite Material in Form von Abrieb abgetragen. Da um die Auflagepunkte herum jeweils eine beschichtungsfreie Zone vorgesehen ist, kann hier nicht zu Leiterbahnabrieb kommen, der elektrisch leitend wäre und zu unerwünschten Kriechströmen oder Kurzschlüssen führen könnte. Durch das Vorsehen der beschichtungsfreien Zonen an allen Auflagepunkten wird die Betriebssicherheit auch langfristig erhöht.According to a preferred embodiment, the proximal board body side is coated with conductor tracks, thus has a conductor track coating. The trace coating respectively, the entire The proximal board body side is preferably also coated with an electrically non-conductive lacquer layer. At each support points at which the board body rests in each case on the support knobs, a coating-free zone is provided in each case, which is free of conductor tracks. A car accessory is constantly exposed to third-party and self-generated vibrations and shocks. Since the board body is only supported in the region of the support points on the supporting knobs, but can move freely radially in principle, occur at the support points inevitably radial relative movements. As a result, material is removed in the form of abrasion on the proximal board body side. Since a coating-free zone is provided around the support points in each case, it is not possible here to produce conductor track wear which would be electrically conductive and could lead to undesirable leakage currents or short-circuits. By providing the coating-free zones at all contact points, the operational reliability is also increased in the long term.

Vorzugsweise weisen die beschichtungsfreien Zonen eine radiale Mindest-Erstreckung von mindestens 4,0 mm, und besonders bevorzugt von mindestens 6,0 mm auf. Hierdurch wird auch bei relativ großen radialen Relativbewegungen zwischen dem Platinenkörper und der Trennwand sichergestellt, dass kein Leiterbahnabrieb erzeugt wird.Preferably, the coating-free zones have a minimum radial extension of at least 4.0 mm, and more preferably of at least 6.0 mm. As a result, it is ensured even with relatively large radial relative movements between the board body and the partition that no Leiterbahnabrieb is generated.

Grundsätzlich können die Stütznoppen als separate Elemente auf der Trennwand befestigt sein, so dass bei dieser Konstellation für die Stütznoppen ein anderes Material gewählt werden kann als für die Trennwand. Bevorzugt sind die Stütznoppen aber einstückig mit der Trennwand ausgebildet. Die Stütznoppen bestehen dann aus demselben Material, wie die Trennwand, was in der Praxis häufig Aluminium ist. Durch die Einstückigkeit ist die Herstellung einfach und preiswert. Allerdings ergibt sich hieraus, dass die Stütznoppen aus einem relativ harten Material, nämlich in der Regel aus Aluminium bestehen. In diesem Zusammenhang ist das Vorsehen einer beschichtungsfreien Zone im Bereich der Auflagepunkte von besonderer Bedeutung, da der Abrieb an den Auflagepunkten praktisch ausschließlich von dem Platinenkörper und seinen Beschichtungen kommt.In principle, the support knobs can be fastened as separate elements on the dividing wall, so that in this constellation, a different material can be selected for the supporting knobs than for the dividing wall. Preferably, the support knobs are formed integrally with the partition wall. The support knobs are then made of the same material as the partition, which is often aluminum in practice. By the one-piece construction is simple and inexpensive. However, it follows that the support knobs are made of a relatively hard material, namely usually made of aluminum. In this context, the provision of a coating-free zone in the region of the support points is of particular importance, since the abrasion at the support points comes almost exclusively from the sinker body and its coatings.

Gemäß einer bevorzugten Ausgestaltung weist die Motorsteuerung mehrere Leistungshalbleiter zum Ansteuern der Motorspulen auf, wobei die Leistungshalbleiter auf Leiterbahnen auf der proximalen Platinenkörper-Seite angeordnet sind, also auf der Seite, die zu dem Motorrotor orientiert ist. Durch die durch die Stütznoppen hergestellte Beabstandung des Platinenkörpers von der Trennwand kann auch die proximale Platinenkörper-Seite problemlos mit Bauteilen bestückt werden. Besonders bietet sich hierzu die Bestückung mit den Leistungshalbleitern an, da diese auf diese Weise über relativ kurze Wege und mit einem geringstmöglichen Wärmeleitungs-Widerstand über die Trennwand gekühlt werden können, die ihrerseits im Falle einer Flüssigkeitspumpe durch die Förderflüssigkeit von der Nassseite aus effektiv gekühlt wird.According to a preferred embodiment, the motor controller has a plurality of power semiconductors for driving the motor coils, wherein the power semiconductors are arranged on conductor tracks on the proximal board body side, ie on the side which is oriented to the motor rotor. Due to the spacing of the board body from the partition wall produced by the supporting knobs, the proximal board body side can also be easily equipped with components. Particularly suitable for this purpose is the placement with the power semiconductors, since they can be cooled in this way over relatively short distances and with the lowest possible heat conduction resistance on the partition, which in turn is effectively cooled by the liquid from the wet side in the case of a liquid pump ,

Vorzugsweise ist zwischen einer Leiterbahn auf der proximalen Platinenkörper-Seite und der Trennwand Wärmeleitmasse vorgesehen, durch die die Wärme von den proximalen Leiterbahnen mit relativ geringem Wärmeleit-Widerstand zu der Trennwand abgeleitet wird. Dies ist insbesondere dann hilfreich, wenn die Leistungshalbleiter auf großflächigen Leiterbahnen appliziert sind, so dass auf diese Weise über einen relativ kurzen Weg bei relativ geringem Wärmeleit-Widerstand viel Wärme von den Leistungshalbleitern über die Leiterbahnen und die Wärmeleitmasse zu der Trennwand abgeführt werden kann. Die Wärmeleitmasse muss hierbei keine tragende oder fixierende Funktion ausüben.Preferably, thermal conduction material is provided between a conductor track on the proximal board body side and the partition wall, by means of which the heat is dissipated from the proximal conductor tracks with a relatively low heat conduction resistance to the partition wall. This is particularly helpful when the power semiconductors are applied to large-area conductor tracks, so that in this way a lot of heat from the power semiconductors via the conductor tracks and the over a relatively short path with relatively low thermal resistance Thermal compound can be dissipated to the partition. The thermal mass does not have to carry any supporting or fixing function here.

Gemäß einer bevorzugten Ausgestaltung wird das Befestigungselement von einer Schraube gebildet, durch die der Platinenkörper in Richtung Trennwand gespannt wird. Eine rotatorische Fixierung der Platine kann alternativ oder ergänzend durch einen entsprechenden Formschluss am Außenrand des Platinenkörpers einerseits und der Innenseite des Motorgehäuses bzw. -Rahmens andererseits sichergestellt werden. Für die Montage der Motorsteuerung bedeutet dies, dass nach der Applizierung der Wärmeleitmasse der bestückte Platinenkörper in das Motorgehäuse eingesetzt und auf die Stütznoppen aufgelegt wird, woraufhin die Schraube eine entsprechende Öffnung in dem Platinenkörper gesteckt und in die Trennwand eingeschraubt wird.According to a preferred embodiment, the fastening element is formed by a screw, through which the board body is tensioned in the direction of the partition wall. A rotational fixation of the board can alternatively or additionally be ensured by a corresponding positive connection on the outer edge of the board body on the one hand and the inside of the motor housing or frame on the other hand. For mounting the motor control, this means that after the application of the thermal mass of the assembled board body is inserted into the motor housing and placed on the support knobs, whereupon the screw is inserted a corresponding opening in the board body and screwed into the partition.

Vorzugsweise ist zwischen der proximalen Platinenkörper-Seite und der Trennwand eine Stützhülse vorgesehen, die das Befestigungselement radial umgibt, so dass der Platinenkörper durch die Stützhülse axial abgestützt ist. Hierdurch wird vermieden, dass der Platinenkörper durch das Befestigungselement zu nah an die Trennwand herangezogen werden kann. Die Stützhülse kann einstückig mit dem Befestigungselement ausgebildet sein, ist bevorzugt jedoch ein separates Element. Die Stützhülse und das Befestigungselement können elektrisch leitend ausgebildet sein, und können auf diese Weise eine zuverlässige Masse-Verbindung zwischen Masse-Leiterbahnen auf beiden Seiten des Platinenkörpers einerseits und der Trennwand andererseits herstellen.Preferably, a support sleeve is provided between the proximal board body side and the partition, which radially surrounds the fastening element, so that the board body is axially supported by the support sleeve. This avoids that the board body can be used by the fastener too close to the partition. The support sleeve may be formed integrally with the fastening element, but is preferably a separate element. The support sleeve and the fastener may be electrically conductive, and can in this way produce a reliable ground connection between ground traces on both sides of the board body on the one hand and the partition on the other.

Besonders bevorzugt ist die axiale Länge der Stützhülse geringer als die axiale Länge der Stütznoppen, wobei die Differenz höchstens im einstelligen Millimeterbereich liegt. Hierdurch kann eine axiale Vorspannung des Platinenkörpers in Bezug auf die Trennwand eingestellt werden. Durch die Vorspannung wird verhindert, dass die Platine im Bereich der Stütznoppen- Auflagepunkte durch Vibrationen kurzzeitig von den Stütznoppen abhebt und anschließend wieder auf die Stütznoppen aufschlägt.Particularly preferably, the axial length of the support sleeve is smaller than the axial length of the support knobs, wherein the difference is at most in the single-digit millimeter range. In this way, an axial bias of the board body can be adjusted with respect to the partition. Due to the bias prevents the board in the area of Stütznoppen- support points by vibrations briefly lifts off the support knobs and then hits back on the support knobs.

Im Folgenden wird unter Bezugnahme auf die Zeichnungen ein Ausführungsbeispiel der Erfindung näher erläutert. Es zeigen:

  • Figur 1 schematisch einen Längsschnitt eines elektrischen Kfz-Nebenaggregats, das einen elektrischen Antriebsmotor aufweist, und
  • Figur 2 schematisch eine Trennwand und eine Motorsteuerung des Antriebsmotors ähnlich der Figur 1 in vergrößerter und detaillierterer Darstellung, wobei beide Figuren 1 und 2 rein schematische Darstellungen sind und deshalb bezüglich bestimmter Anordnungen und Proportionen voneinander abweichen.
In the following an embodiment of the invention will be explained in more detail with reference to the drawings. Show it:
  • FIG. 1 schematically a longitudinal section of an electrical motor vehicle accessory, which has an electric drive motor, and
  • FIG. 2 schematically a partition and a motor control of the drive motor similar to FIG. 1 in enlarged and more detailed illustration, both being Figures 1 and 2 are purely schematic representations and therefore differ from each other with respect to certain arrangements and proportions.

In der Figur 1 ist ein elektrisches Kfz-Nebenaggregat 10 dargestellt, das vorliegend als eine Kfz-Kühlmittelpumpe ausgebildet ist. Das Kfz-Nebenaggregat 10 weist einen elektrischen Antriebsmotor 12 auf, der ein Impeller-Pumpenrad 16 antreibt. Der Antriebsmotor 12 ist als sogenannter Spaltrohr-Antriebsmotor ausgebildet. Der elektronisch kommutierte Antriebsmotor 12 weist einen außenliegenden bespulten Motorstator 20 auf, der durch ein zylindrisches Spaltrohr 18 flüssigkeitsdicht getrennt ist von einem permanentmagnetischen Motorrotor 15, der drehfest auf einer Rotorwelle 14 fixiert ist. Auch das Pumpenrad 16 ist drehfest auf der Rotorwelle 14 fixiert. Die Rotorwelle 20 dreht sich um eine Antriebsmotor-Axiale Z.In the FIG. 1 An electric motor vehicle accessory 10 is shown, which in the present case is designed as a motor vehicle coolant pump. The vehicle accessory 10 includes an electric drive motor 12 which drives an impeller impeller 16. The drive motor 12 is designed as a so-called canned drive motor. The electronically commutated Drive motor 12 has an external bespulten motor stator 20 which is liquid-tightly separated by a cylindrical can 18 from a permanent magnet motor rotor 15 which is fixed in rotation on a rotor shaft 14. The impeller 16 is fixed in rotation on the rotor shaft 14. The rotor shaft 20 rotates about a drive motor axial Z.

Der Motorstator 20 weist einen Leitkörper 22 und mehrere Statorspulen 24 auf, die auf den Leitkörper 22 aufgewickelt sind. Der bürstenlose Antriebsmotor 12 weist eine elektronische Motorsteuerung 50 auf, die die elektronische Kommutierung vornimmt und durch die die Statorspulen 24 mit elektrischer Energie versorgt werden. Der Antriebsmotor 12 weist ein mehrteiliges Gehäuse 26 auf, das das Spaltrohr 18 trägt und den Motorstator 20 und die Motorsteuerung 50 umgibt und abschirmt.The motor stator 20 has a guide body 22 and a plurality of stator coils 24 which are wound on the guide body 22. The brushless drive motor 12 has an electronic motor control 50, which performs the electronic commutation and through which the stator coils 24 are supplied with electrical energy. The drive motor 12 has a multi-part housing 26, which carries the can 18 and the motor stator 20 and the motor controller 50 surrounds and shields.

Axial zwischen dem Motorstator 20, dem Spaltrohr 18 und dem Motorrotor 15 einerseits und der elektronischen Motorsteuerung 50 andererseits ist in einer Querebene liegend eine Trennwand 30 vorgesehen, die das Spaltrohr 18 in einer Ringnut trägt. Ferner ist in einer axialen Ausnehmung auf der Nassseite der Trennwand 30 ein Wellenlager 32 vorgesehen, durch das die Rotorwelle 14 drehbar gelagert ist. Die Trennwand 30 trennt insbesondere einen Nassraum, in dem der Motorrotor 15 angeordnet ist, flüssigkeitsdicht von einem Trockenraum, in dem die Motorsteuerung 50 angeordnet ist.Axially between the motor stator 20, the gap tube 18 and the motor rotor 15 on the one hand and the electronic motor control 50 on the other hand, a partition wall 30 is provided in a transverse plane, which carries the can 18 in an annular groove. Further, in an axial recess on the wet side of the partition wall 30, a shaft bearing 32 is provided, through which the rotor shaft 14 is rotatably mounted. The partition wall 30 separates in particular a wet space in which the motor rotor 15 is arranged, liquid-tight from a drying space in which the motor control 50 is arranged.

Auf der distalen Seite der Trennwand 30 ist die Motorsteuerung 50 in einem trockenen Steuerungsraum angeordnet. Die Motorsteuerung 50 wird im Wesentlichen von einer beidseitig mit aktiven und passiven elektronischen Bauelementen 56,62 bestückten Platinenkörper 52 gebildet, der in einer Querebene angeordnet ist, also quer zu der Antriebsmotor-Axialen Z.On the distal side of the partition wall 30, the motor controller 50 is disposed in a dry control room. The engine controller 50 is essentially formed by a both sides with active and passive electronic components 56,62 populated board body 52 which is arranged in a transverse plane, ie transverse to the drive motor axial Z.

An der distalen Seite der Trennwand 30 sind in dem von dem Platinenkörper 52 bedeckten Bereich drei axiale Stütznoppen 34,35 vorgesehen, die ungefähr so angeordnet sind, dass sie die Eckpunkte eines gleichseitigen Dreiecks bilden, dessen Mittelpunkt ungefähr die Antriebsmotor-Axiale Z ist. Die Stütznoppen 34,35 sind einstückig mit der aus Aluminium bestehenden Trennwand 30 ausgebildet. Der Platinenkörper 52 weist auf beiden Seiten Leiterbahnen 54,60 auf, die vorliegend nur als eine homogene Leiterbahn-Schicht dargestellt sind. Die Leiterbahnen 54,60 verbinden die elektronischen Bauelemente 62,56 elektrisch miteinander. Auf der proximalen Seite des Platinenkörpers 52 sind als elektronische Bauelemente mehrere Leistungshalbleiter 56 appliziert. Durch die Leistungshalbleiter 56 werden über entsprechende elektrische Versorgungsleitungen 64 die Statorspulen 24 mit elektrischer Energie versorgt.On the distal side of the partition wall 30, in the area covered by the board body 52, there are provided three axial support knobs 34, 35 which are arranged approximately to form the vertices of an equilateral triangle whose center is approximately the drive motor axial Z. The support nubs 34,35 are integrally formed with the existing partition wall 30 made of aluminum. The board body 52 has on both sides of conductor tracks 54,60, which are present in the present case only as a homogeneous interconnect layer. The tracks 54,60 electrically connect the electronic components 62,56 each other. On the proximal side of the board body 52, a plurality of power semiconductors 56 are applied as electronic components. The power semiconductors 56 supply the stator coils 24 with electrical energy via corresponding electrical supply lines 64.

An den drei Auflagepunkten 55, an denen der Platinenkörpers 52 jeweils auf den Stütznoppen 34,35 aufliegt, ist eine beschichtungsfreie Zone 57 vorgesehen, die leiterbahnfrei ist. Die beschichtungsfreie Zone 57 ist vorliegend ungefähr kreisrund ausgebildet und weist einen Durchmesser von 5-6 mm auf.At the three contact points 55, on which the board body 52 respectively rests on the support nubs 34,35, a coating-free zone 57 is provided, which is free of conductor tracks. The coating-free zone 57 is present approximately circular in shape and has a diameter of 5-6 mm.

Ungefähr in der Mitte des kreisrunden Platinenkörpers 52 ist ein Befestigungselement 40 vorgesehen, das vorliegend von einer Schraube gebildet wird, die durch eine entsprechende zentrale Öffnung bzw. axiale Bohrung des Platinenkörpers 52 gesteckt und in eine korrespondierende Gewindebohrung der Trennwand 30 eingeschraubt ist. Zwischen der distalen Seite der Trennwand 30 und der proximalen Seite des Platinenkörpers 52 ist eine ringförmige Stützhülse 42 vorgesehen, die das Befestigungselement 40 radial umgibt und im Bereich des Befestigungselements 40 den axialen Abstand zwischen dem Platinenkörper 52 und der Trennwand 30 definiert. Die axiale Länge der Stützhülse 42 ist 1-3 mm geringer als die axiale Länge der Stütznoppen 34,35, so dass die Platinenkörper-Mitte axial vorgespannt ist.Approximately in the middle of the circular board body 52, a fastening element 40 is provided, which is presently formed by a screw which is inserted through a corresponding central opening or axial bore of the board body 52 and screwed into a corresponding threaded bore of the partition 30. Between the distal side of the partition wall 30 and the proximal side of the sinker body 52, an annular support sleeve 42 is provided which radially surrounds the fastening element 40 and defines the axial distance between the sinker body 52 and the partition wall 30 in the region of the fastening element 40. The axial length of the support sleeve 42 is 1-3 mm less than the axial length of the support nubs 34,35, so that the sinker body center is axially biased.

In einem ringförmigen Bereich um das Befestigungselement 40 und die Stützhülse 42 herum sind die Leiterbahnen 54 einerseits und die Trennwand 30 andererseits axial durch eine Wärmeleitmasse 58 thermisch miteinander verbunden. Die Wärmeleitmasse 58 ist vorliegend ringförmig um die Axiale Z und um das Befestigungselement 40 herum angeordnet. Die von den Leistungshalbleitern 56 generierte Wärme wird über die sie tragenden Leiterbahnen und die Wärmeleitmasse 58 auf die Aluminium-Trennwand 30 abgeleitet, die auf ihrer proximalen Seite durch die Förderflüssigkeit in dem Nassraum aktiv gekühlt wird.In an annular region around the fastening element 40 and the support sleeve 42 around the conductor tracks 54 on the one hand and the partition wall 30 on the other hand are thermally connected to each other by a thermally conductive compound 58 axially. In the present case, the heat conducting compound 58 is arranged annularly around the axial Z and around the fastening element 40. The heat generated by the power semiconductors 56 is dissipated via the conductor tracks carrying them and the heat conducting compound 58 onto the aluminum partition wall 30, which is actively cooled on its proximal side by the delivery liquid in the wet space.

Claims (10)

  1. Electric motor vehicle auxiliary unit (10) comprising an electric drive motor (12), wherein
    the drive motor (12) is configured as an electronically commutated canned motor and comprises a can (18) separating a permanent-magnetic motor rotor (15) in a fluid-tight manner from a motor stator (20) having a plurality of stator coils (24),
    the drive motor (12) has a partitioning wall (30) and a motor control (50), wherein the partitioning wall (30) is substantially arranged in a transversal plane extending transversely to a rotor shaft (14) and separates the motor control (50) from the motor rotor (15) in a fluid-tight manner,
    the motor control (50) has a circuit board body (52) substantially arranged in a transversal plane and fastened to the partitioning wall (30),
    characterized in that
    the partitioning wall (30) comprises at least two axial support nubs (34, 35) on which the circuit board body (52) is axially supported by its proximal side (53) facing the partitioning wall (53) and which do not serve to fasten the circuit board body on the partitioning wall, and
    at least one fastening element (40) is provided by which the circuit board body (52) is held axially on the partitioning wall (30).
  2. Electric motor vehicle auxiliary unit (10) of claim 1, wherein the proximal side (53) of the circuit board is coated with a conductor path (54), wherein a coating-free zone (57) free of conductor paths is provided at all contact points (55) at which the circuit board body (52) rests on the support nubs (34, 35), respectively.
  3. Electric motor vehicle auxiliary unit (10) of claim 2, wherein the coating-free zone (57) has a minimum radial dimension of at least 4.0 mm, particularly preferred at least 6.0 mm.
  4. Electric motor vehicle auxiliary unit (10) of one of the preceding claims, wherein the partitioning wall (30) has three axial support nubs (34, 35).
  5. Electric motor vehicle auxiliary unit (10) of one of the preceding claims, wherein the support nubs (34, 35) are formed integrally with the partitioning wall (30).
  6. Electric motor vehicle auxiliary unit (10) of one of the preceding claims, wherein the motor control (50) has a plurality of power semiconductors (56) for driving the motor coils (24), wherein the power semiconductors (56) are arranged on conductor paths (54) on the proximal side (53) of the circuit board body.
  7. Electric motor vehicle auxiliary unit (10) of claim 6, wherein a heat-conductive mass (58) is provided between a conductor path (54) on the proximal side (53) of the circuit board body and the partitioning wall (30).
  8. Electric motor vehicle auxiliary unit (10) of one of the preceding claims, wherein the fastening element (40) is formed by a screw by which the circuit board body (50) is biased towards the portioning wall (30).
  9. Electric motor vehicle auxiliary unit (10) of one of the preceding claims, wherein a support sleeve (42) is provided between the proximal side (53) of the circuit board body and the partitioning wall (30), which radially surrounds the fastening element (40).
  10. Electric motor vehicle auxiliary unit (10) of claim 9, wherein the axial length of the support sleeve (42) is less than the axial length of the support nubs (34, 35).
EP14169479.4A 2014-05-22 2014-05-22 Electric motor vehicle auxiliary unit Active EP2947324B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP14169479.4A EP2947324B1 (en) 2014-05-22 2014-05-22 Electric motor vehicle auxiliary unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14169479.4A EP2947324B1 (en) 2014-05-22 2014-05-22 Electric motor vehicle auxiliary unit

Publications (2)

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EP2947324A1 EP2947324A1 (en) 2015-11-25
EP2947324B1 true EP2947324B1 (en) 2019-07-24

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113202775B (en) * 2017-08-23 2023-09-15 浙江三花智能控制股份有限公司 electric pump
WO2022096135A1 (en) * 2020-11-09 2022-05-12 Pierburg Pump Technology Gmbh Electric coolant pump

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Publication number Priority date Publication date Assignee Title
DE19545561A1 (en) * 1995-12-07 1997-06-12 Pierburg Ag Pump motor unit
US6132184A (en) * 1998-11-05 2000-10-17 Ford Motor Company Reservoir apparatus for an electronically controlled electric pump
JP2008128076A (en) * 2006-11-20 2008-06-05 Aisan Ind Co Ltd Fluid pump
EP2476914B1 (en) 2011-01-13 2017-08-02 Pierburg Pump Technology GmbH Electric vehicle coolant pump
JP2013099021A (en) * 2011-10-28 2013-05-20 Mitsubishi Electric Corp Pump and heat pump device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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