EP2905471B1 - Electrically operated motor vehicle coolant pump - Google Patents

Electrically operated motor vehicle coolant pump Download PDF

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Publication number
EP2905471B1
EP2905471B1 EP14154591.3A EP14154591A EP2905471B1 EP 2905471 B1 EP2905471 B1 EP 2905471B1 EP 14154591 A EP14154591 A EP 14154591A EP 2905471 B1 EP2905471 B1 EP 2905471B1
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EP
European Patent Office
Prior art keywords
motor
coolant pump
electrically operated
heat
motor vehicle
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EP14154591.3A
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German (de)
French (fr)
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EP2905471A1 (en
Inventor
Toni Henke
Kathrin Holzbauer
Alexander Findeisen
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Pierburg Pump Technology GmbH
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Pierburg Pump Technology GmbH
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Priority to EP14154591.3A priority Critical patent/EP2905471B1/en
Priority to PCT/EP2015/051395 priority patent/WO2015121051A1/en
Publication of EP2905471A1 publication Critical patent/EP2905471A1/en
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    • 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 electric motor vehicle coolant pump, which is driven by an electric drive motor, which is designed as a so-called canned motor.
  • a motor vehicle coolant pump serves to pump a liquid heat carrier, hereinafter referred to as coolant, in a heating or cooling circuit.
  • the coolant circuit does not necessarily have to be a main flow of the circuit, but may also form a side stream.
  • canned motors are used as drive motors, which are commutated electronically.
  • the motor rotor is arranged in the wet area, whereas the motor stator forming the motor coils are arranged in the dry area.
  • the motor rotor space and the motor stator space are separated from each other in a liquid-tight manner by a generally cylindrical can.
  • the problem with an electronically commutated drive motor is basically the cooling of the motor control, which has a plurality of power semiconductors for controlling the motor coils, which must heat up considerably during operation and must be cooled accordingly in order to prevent their destruction.
  • the motor coils are another heat source that should be thermally shielded as well as possible with respect to the motor control. To cool the power semiconductors, it makes sense to use this for the coolant flowing through the coolant pump.
  • EP 2 651 015 A1 discloses an electric fluid pump in which the control room with the engine control immediately adjacent to the containment shell.
  • Out EP 2 469 102 A1 is an electric motor vehicle coolant pump known, the canned drive motor is electronically commutated.
  • the dividing wall often consists of a material with good heat conduction, in order to ensure a good heat flow from the engine control through the dividing wall to the coolant.
  • the partition also separates the motor coils from the control room, heat from the motor coils into the control room can also be entered via this path.
  • Object of the invention against this background is to provide an electric motor vehicle coolant pump with improved cooling of the engine control.
  • the electric motor vehicle coolant pump has a pump unit, which is driven by the electric drive motor.
  • the pump unit may for example be designed as a so-called impeller having a central axial inlet and the liquid coolant pumped radially outward.
  • In the motor section is a permanent magnetically excited motor rotor, a plurality of motor coils provided motor stator and a split pot, which separates the motor stator liquid-tight from the motor rotor.
  • the fixed motor coils are preferably annular around the rotating motor rotor arranged around.
  • the coolant pump has a control section with a control room in which the engine control is arranged.
  • the control room is hermetically separated from the motor section by a plastic partition wall lying essentially in a transverse plane, so that the partition wall shields the control room from the containment shell insulating the wet space with the motor stator.
  • the partition wall has a heat transfer opening in which a heat conductor is arranged which is in heat-conducting contact with the split pot with its one axial longitudinal end and in heat-conducting contact with the motor control at its other axial longitudinal end.
  • the specific thermal conductivity of the heat conductor is higher than the specific thermal conductivity of the partition wall plastic. Particularly preferably, the specific thermal conductivity of the heat conductor is at least twice as high as the specific thermal conductivity of the partition wall plastic.
  • the control room with the motor control is thermally well insulated and shielded from the motor section, in which inter alia, the heat generating motor coils are arranged.
  • the heat input of the motor coils in the control room is reduced in this way to a minimum.
  • the heat conductor in the heat transfer opening of the partition wall produces "pointwise" a thermal bridge between the motor control and the containment shell, which preferably consists of a material with a relatively high specific heat conductivity.
  • the heat conductor is spatially preferably arranged where the motor control generates the most heat, ie in the vicinity of the power semiconductors.
  • the plastic partition wall including the partition axially penetrating heat conductor on the one hand, a good thermal insulation of the control room with respect to the motor coils and on the other hand, a targeted heat dissipation from the engine control to the containment shell realized.
  • the heat conductor is preferably formed by a thermal adhesive or a non-adhesive thermal compound that completely fills and closes the heat transfer opening so that the motor section is fluidically completely isolated from the control section.
  • thermal adhesive is permanently a gap-free connection of the heat conductor to the containment shell on the one hand and the engine control on the other hand ensured.
  • the heat conductor can also be designed to be elastic and clamped axially between the motor control and the containment shell, so that a gap-free thermal connection of the heat conductor to the containment shell and the motor control is permanently ensured in this way.
  • the heat conductor can also be formed by a rigid and prefabricated solid, for example, a metal body or a ceramic body, which is particularly preferably thermally coupled by a thermal adhesive or a thermal mass gap-free to the engine control and the containment shell, but (electrically insulating) formed is.
  • the heat conductor is designed as an electrical insulator.
  • the heat conductor can be thermally coupled directly to a conductor track or to a power semiconductor without thereby producing an electrical connection from the conductor track or the power semiconductor to the containment shell.
  • the heat transfer opening is formed by a sleeve body whose axial length substantially corresponds to the axial distance between the containment shell and the engine control.
  • the axial length of the sleeve body is greater than the axial wall thickness of the partition wall, so that the sleeve body axially projects beyond the partition wall on one or both axial sides.
  • the plastic partition forms the only spatial separation between the motor coils and the control room. Since the plastic baffle forms good thermal insulation, another baffle is not required to ensure good thermal isolation of the motor bobbins from the control room.
  • the plastic partition wall is an integral part of a plastic housing body which radially surrounds the motor stator and / or the control room. As a result, the additional production cost for the partition is kept relatively low.
  • the containment shell is made of metal, which has a good thermal conductivity.
  • a metal containment shell has the advantage of being absolutely leakproof with respect to liquids such as water or water vapor, so that a transfer of moisture into the control room is excluded.
  • the containment shell has a substantially lying in a transverse plane pot bottom, which is in heat-conducting contact with the heat conductor directly.
  • the Heat conductor or the heat transfer opening is within the axial projection of the pot bottom.
  • the motor control is arranged on a standing in a transverse plane board and has the motor control power semiconductors, which are directly or indirectly connected via separate guide elements thermally conductive to the heat conductor.
  • the power semiconductors When the power semiconductors are located on the distal side of the board, the heat is conducted through the routing elements to the proximal side of the board.
  • the power semiconductors may be arranged on the proximal side of the board facing the plastic partition wall so that the cooling vanes of the power semiconductors are connected directly to the heat conductor with the heat conductor.
  • the heat-conducting elements of the motor control board are particularly preferably formed by metal sleeves, metal sleeves filled with a heat conductor and / or metal pins which are inserted in the board.
  • the power semiconductors may in this case be arranged on the distal side of the circuit board, wherein the heat conduction elements establish the thermal connection through the circuit board to the proximal side of the circuit board.
  • the power semiconductors are arranged in close proximity to the heat conductor, so that the heat path is short and the absolute thermal resistance between the power semiconductors and the heat conductor is low.
  • the FIG. 1 shows an electric motor vehicle coolant pump 10, which is used in a cooling circuit of a motor vehicle, for example, the pumping of a liquid coolant, such as water, for cooling an internal combustion engine or other aggregate.
  • a liquid coolant such as water
  • the coolant pump 10 has three sections in the axial direction, namely a pump section 12, a motor section 14 adjoining thereto and a control section 16 adjoining the motor section 14.
  • a pump rotor 20 is arranged, which in the present case is a so-called impeller axial central inlet and the coolant pumps radially outward.
  • the pump rotor 20 is driven by an electronically commutated drive motor, which is essentially formed by a permanent magnetically excited motor rotor 30 and these coaxial and annular motor coils 33 surrounding the motor rotor 30, which constitute the motor stator 32.
  • the motor rotor 30 is hermetically and liquid-tight isolated from the motor stator 32 by a metal can 40. Radially between the motor rotor 30 and the motor stator 32, a cylinder body 44 of the split pot 40 is arranged in the cylindrical magnetic gap between the motor stator 32 and the motor rotor 30th lies.
  • the containment shell 40 has adjacent to the pump facing away from the longitudinal end of the motor rotor 30 adjacent to an annular pot bottom 42.
  • a plastic partition wall 50 arranged in a transverse plane, which forms a fluid-tight separation of the motor section 14 from the control section 16 defined by an electronic motor control 71 in a control room 70.
  • the plastic partition wall 50 is an integral part of a plastic housing body 18 which is substantially cylindrical and radially surrounds the motor stator 32 and the control room 70.
  • the plastic partition wall 50 has a heat transfer opening 64, which is extended by a sleeve body 60 axially beyond the axial thickness of the partition 50 on both sides, so that on the proximal side a proximal collar 63 and on the distal side a distal collar 62nd is realized.
  • the elongate heat transfer opening 64 formed in this way is completely filled with a heat conductor 66, which consists of a cured bathleitkleber.
  • the thermal adhesive has a good specific thermal conductivity and forms an electrical insulator.
  • the motor controller 71 in the control room 70 has a board 73 lying in a transverse plane, which carries the electronic components, which also include a plurality of power semiconductors 72.
  • the power semiconductors 72 are arranged on the distal side of the circuit board 73, ie on the side of the circuit board 73 facing away from the dividing wall 50.
  • the power semiconductors 72 are heaped and concentrated in a small area, in axial alignment with the heat conductor 66.
  • the circuit board 73 is repeatedly through-plated with guide elements 74 in the form of metal sleeves or metal pins filled with a heat-conducting compound, so that the heat generated by the power semiconductors 72 via their cooling surfaces and the guide elements 74 to the proximal side of the board 73 is headed.
  • a metallic collecting surface 76 is applied, which establishes the thermal connection between the guide elements 74 on the proximal side of the printed circuit board.
  • the heat conductor 66 is thermally connected directly to the collecting surface 76 such that overall a low thermal resistance is realized.

Description

Die Erfindung bezieht sich auf eine elektrische Kraftfahrzeug-Kühlmittelpumpe, die durch einen elektrischen Antriebsmotor angetrieben wird, der als sogenannter Spaltrohrmotor ausgebildet ist.The invention relates to an electric motor vehicle coolant pump, which is driven by an electric drive motor, which is designed as a so-called canned motor.

Eine Kraftfahrzeug-Kühlmittelpumpe dient dazu, einen flüssigen Wärmeträger, im Folgenden stets Kühlmittel genannt, in einem Heiz- oder Kühl-Kreislauf zu pumpen. Der Kühlmittel-Kreislauf muss nicht notwendigerweise ein Hauptstrom des Kreislaufes sein, sondern kann auch einen Nebenstrom bilden. Für eine öffnungsfreie Trennung des Nassbereiches vom Trockenbereich der Kühlmittelpumpe werden als Antriebsmotoren sogenannte Spaltrohrmotoren verwendet, die elektronisch kommutiert werden. Der Motorrotor ist in dem Nassbereich angeordnet, wohingegen die den Motorstator bildenden Motorspulen im Trockenbereich angeordnet sind. Der Motorrotor-Raum und der Motorstator-Raum sind durch ein in der Regel zylindrisches Spaltrohr voneinander flüssigkeitsdicht voneinander getrennt.A motor vehicle coolant pump serves to pump a liquid heat carrier, hereinafter referred to as coolant, in a heating or cooling circuit. The coolant circuit does not necessarily have to be a main flow of the circuit, but may also form a side stream. For an opening-free separation of the wet area from the dry area of the coolant pump so-called canned motors are used as drive motors, which are commutated electronically. The motor rotor is arranged in the wet area, whereas the motor stator forming the motor coils are arranged in the dry area. The motor rotor space and the motor stator space are separated from each other in a liquid-tight manner by a generally cylindrical can.

Problematisch ist bei einem elektronisch kommutierten Antriebsmotor grundsätzlich die Kühlung der Motorsteuerung, die zur Ansteuerung der Motorspulen mehrere Leistungshalbleiter aufweist, die im Betrieb stark erhitzen und entsprechend gekühlt werden müssen, um ihre Zerstörung zu verhindern. Die Motorspulen sind eine weitere Wärmequelle, die im Bezug auf die Motorsteuerung thermisch möglichst gut abgeschirmt sein soll. Zur Kühlung der Leistungshalbleiter bietet es sich an, hierfür das Kühlmittel zu nutzen, das die Kühlmittelpumpe durchströmt.The problem with an electronically commutated drive motor is basically the cooling of the motor control, which has a plurality of power semiconductors for controlling the motor coils, which must heat up considerably during operation and must be cooled accordingly in order to prevent their destruction. The motor coils are another heat source that should be thermally shielded as well as possible with respect to the motor control. To cool the power semiconductors, it makes sense to use this for the coolant flowing through the coolant pump.

EP 2 651 015 A1 offenbart eine elektrische Flüssigkeitspumpe, bei der der Steuerungsraum mit der Motorsteuerung unmittelbar angrenzt an den Spalttopf. EP 2 651 015 A1 discloses an electric fluid pump in which the control room with the engine control immediately adjacent to the containment shell.

Aus EP 2 469 102 A1 ist eine elektrische Kraftfahrzeug-Kühlmittelpumpe bekannt, deren Spaltrohr-Antriebsmotor elektronisch kommutiert wird. Die Kühlung der elektronischen Motorsteuerung erfolgt über eine im wesentlichen in einer Querebene angeordnete Trennwand, die den Nassraum, in dem der permanentmagnetische Motorrotor angeordnet ist, von dem Steuerungsraum trennt, in dem die elektronische Motorsteuerung angeordnet ist. Die Trennwand besteht in der Praxis häufig aus einem Material mit guter Wärmeleitung, um einen guten Wärmefluss von der Motorsteuerung durch die Trennwand zum Kühlmittel sicherzustellen. Da die Trennwand auch die Motorspulen von dem Steuerungsraum trennt, kann über diesen Weg jedoch auch Wärme von den Motorspulen in den Steuerungsraum eingetragen werden.Out EP 2 469 102 A1 is an electric motor vehicle coolant pump known, the canned drive motor is electronically commutated. The cooling of the electronic engine control via a arranged substantially in a transverse plane partition, which separates the wet space in which the permanent magnet motor rotor is arranged from the control room in which the electronic engine control is arranged. In practice, the dividing wall often consists of a material with good heat conduction, in order to ensure a good heat flow from the engine control through the dividing wall to the coolant. However, since the partition also separates the motor coils from the control room, heat from the motor coils into the control room can also be entered via this path.

Aufgabe der Erfindung vor diesem Hintergrund ist es, eine elektrische Kraftfahrzeug-Kühlmittelpumpe mit verbesserter Kühlung der Motorsteuerung zu schaffen.Object of the invention against this background is to provide an electric motor vehicle coolant pump with improved cooling of the engine control.

Diese Aufgabe wird durch eine elektrische Kraftfahrzeug-Kühlmittelpumpe mit den Merkmalen des Anspruches 1 gelöst.This object is achieved by an electric motor vehicle coolant pump having the features of claim 1.

Die erfindungsgemäße elektrische Kraftfahrzeug-Kühlmittelpumpe weist ein Pumpenaggregat auf, das durch den elektrischen Antriebsmotor angetrieben wird. Das Pumpaggregat kann beispielsweise als so genannter Impeller ausgebildet sein, der einen zentralen axialen Einlass aufweist und das flüssige Kühlmittel radial nach außen pumpt. In dem Motorabschnitt ist ein permanentmagnetisch erregter Motorrotor, ein mehrere Motorspulen aufweisenden Motorstator und ein Spalttopf vorgesehen, der den Motorstator flüssigkeitsdicht von dem Motorrotor trennt. Die feststehenden Motorspulen sind bevorzugt ringförmig um den rotierenden Motorrotor herum angeordnet. Ferner weist die Kühlmittelpumpe einen Steuerungsabschnitt mit einem Steuerungsraum auf, in dem die Motorsteuerung angeordnet ist.The electric motor vehicle coolant pump according to the invention has a pump unit, which is driven by the electric drive motor. The pump unit may for example be designed as a so-called impeller having a central axial inlet and the liquid coolant pumped radially outward. In the motor section is a permanent magnetically excited motor rotor, a plurality of motor coils provided motor stator and a split pot, which separates the motor stator liquid-tight from the motor rotor. The fixed motor coils are preferably annular around the rotating motor rotor arranged around. Further, the coolant pump has a control section with a control room in which the engine control is arranged.

Der Steuerungsraum ist durch eine im Wesentlichen in einer Querebene liegende Kunststoff-Trennwand von dem Motorabschnitt hermetisch getrennt, so dass die Trennwand den Steuerungsraum von dem den Nassraum mit dem Motorstator isolierenden Spalttopf abschirmt. Die Trennwand weist eine Wärmeübertragungsöffnung auf, in der ein Wärmeleiter angeordnet ist, der mit seinem einen axialen Längsende in wärmeleitenden Kontakt mit dem Spalttopf und mit seinem anderen axialen Längsende in wärmeleitenden Kontakt mit der Motorsteuerung steht. Die spezifische Wärmeleitfähigkeit des Wärmeleiters ist höher als die spezifische Wärmeleitfähigkeit des Trennwand-Kunststoffs. Besonders bevorzugt ist die spezifische Wärmeleitfähigkeit des Wärmeleiters mindestens doppelt so hoch wie die spezifische Wärmeleitfähigkeit des Trennwand-Kunststoffs.The control room is hermetically separated from the motor section by a plastic partition wall lying essentially in a transverse plane, so that the partition wall shields the control room from the containment shell insulating the wet space with the motor stator. The partition wall has a heat transfer opening in which a heat conductor is arranged which is in heat-conducting contact with the split pot with its one axial longitudinal end and in heat-conducting contact with the motor control at its other axial longitudinal end. The specific thermal conductivity of the heat conductor is higher than the specific thermal conductivity of the partition wall plastic. Particularly preferably, the specific thermal conductivity of the heat conductor is at least twice as high as the specific thermal conductivity of the partition wall plastic.

Durch die Kunststoff-Trennwand ist der Steuerungsraum mit der Motorsteuerung thermisch gut isoliert und abgeschirmt gegenüber dem Motorabschnitt, in dem unter anderem die wärmeerzeugenden Motorspulen angeordnet sind. Der Wärmeeintrag der Motorspulen in den Steuerungsraum ist auf diese Weise auf ein Minimum reduziert. Der Wärmeleiter in der Wärmeübertragungsöffnung der Trennwand stellt aber "punktuell" eine Wärmebrücke zwischen der Motorsteuerung und dem Spalttopf her, der bevorzugt aus einem Material mit relativ hoher spezifischerer Wärmeleitfähigkeit besteht. Der Wärmeleiter ist räumlich bevorzugt dort angeordnet, wo die Motorsteuerung die meiste Wärme erzeugt, also in der Nähe der Leistungshalbleiter.Due to the plastic partition wall, the control room with the motor control is thermally well insulated and shielded from the motor section, in which inter alia, the heat generating motor coils are arranged. The heat input of the motor coils in the control room is reduced in this way to a minimum. However, the heat conductor in the heat transfer opening of the partition wall produces "pointwise" a thermal bridge between the motor control and the containment shell, which preferably consists of a material with a relatively high specific heat conductivity. The heat conductor is spatially preferably arranged where the motor control generates the most heat, ie in the vicinity of the power semiconductors.

Durch die Kunststoff-Trennwand einschließlich des die Trennwand axial durchdringenden Wärmeleiters wird einerseits eine gute thermische Isolation des Steuerungsraums gegenüber den Motorspulen und andererseits dennoch eine gezielte Wärmeabführung von der Motorsteuerung zum Spalttopf realisiert.By the plastic partition wall including the partition axially penetrating heat conductor on the one hand, a good thermal insulation of the control room with respect to the motor coils and on the other hand, a targeted heat dissipation from the engine control to the containment shell realized.

Der Wärmeleiter wird bevorzugt von einem Wärmeleitkleber oder einer nicht-klebenden Wärmeleitmasse gebildet, der bzw. die die Wärmeübertragungsöffnung vollständig ausfüllt und verschließt, so dass der Motorabschnitt fluidisch vollständig isoliert ist von dem Steuerungsabschnitt. Durch den Wärmeleitkleber wird dauerhaft eine spaltfreie Anbindung des Wärmeleiters an den Spalttopf einerseits und die Motorsteuerung andererseits sichergestellt. Der Wärmeleiter kann auch elastisch ausgebildet und zwischen der Motorsteuerung und dem Spaltstopf axial eingespannt sein, so dass auch auf diese Weise dauerhaft eine spaltfreie thermische Anbindung des Wärmeleiters an den Spalttopf und die Motorsteuerung sichergestellt ist.The heat conductor is preferably formed by a thermal adhesive or a non-adhesive thermal compound that completely fills and closes the heat transfer opening so that the motor section is fluidically completely isolated from the control section. By the thermal adhesive is permanently a gap-free connection of the heat conductor to the containment shell on the one hand and the engine control on the other hand ensured. The heat conductor can also be designed to be elastic and clamped axially between the motor control and the containment shell, so that a gap-free thermal connection of the heat conductor to the containment shell and the motor control is permanently ensured in this way.

Alternativ oder ergänzend kann der Wärmeleiter auch von einem steifen und vorgefertigten Festkörper gebildet sein, beispielsweise von einem Metallkörper oder einem Keramikkörper, der besonders bevorzugt durch einen Wärmeleitkleber oder eine Wärmeleitmasse spaltfrei an die Motorsteuerung und den Spalttopf thermisch angekoppelt ist, jedoch (elektrisch isolierend) ausgebildet ist.Alternatively or additionally, the heat conductor can also be formed by a rigid and prefabricated solid, for example, a metal body or a ceramic body, which is particularly preferably thermally coupled by a thermal adhesive or a thermal mass gap-free to the engine control and the containment shell, but (electrically insulating) formed is.

Vorzugsweise ist der Wärmeleiter als elektrischer Isolator ausgebildet. Hierdurch kann der Wärmeleiter unmittelbar an eine Leiterbahn oder an einen Leistungshalbleiter thermisch angekoppelt werden, ohne dass hierdurch eine elektrische Verbindung von der Leiterbahn bzw. dem Leistungshalbleiter zu dem Spalttopf hergestellt wird.Preferably, the heat conductor is designed as an electrical insulator. In this way, the heat conductor can be thermally coupled directly to a conductor track or to a power semiconductor without thereby producing an electrical connection from the conductor track or the power semiconductor to the containment shell.

Vorzugsweise wird die Wärmeübertragungsöffnung von einem Hülsenkörper gebildet, dessen axiale Länge im wesentlichen dem axialen Abstand zwischen dem Spalttopf und der Motorsteuerung entspricht. Die axiale Länge des Hülsenkörpers ist größer als die axiale Wandstärke der Trennwand, so dass der Hülsenkörper die Trennwand axial an einer oder beiden axialen Seiten überragt.Preferably, the heat transfer opening is formed by a sleeve body whose axial length substantially corresponds to the axial distance between the containment shell and the engine control. The axial length of the sleeve body is greater than the axial wall thickness of the partition wall, so that the sleeve body axially projects beyond the partition wall on one or both axial sides.

Vorzugsweise bildet die Kunststoff-Trennwand die einzige räumliche Trennung zwischen den Motorspulen und dem Steuerungsraum. Da die Kunststoff-Trennwand eine gute thermische Isolation bildet, ist eine weitere Trennwand nicht erforderlich, um eine gute thermische Isolation der Motorspulen von dem Steuerungsraum sicherzustellen.Preferably, the plastic partition forms the only spatial separation between the motor coils and the control room. Since the plastic baffle forms good thermal insulation, another baffle is not required to ensure good thermal isolation of the motor bobbins from the control room.

Gemäß einer bevorzugten Ausführungsform ist die Kunststoff-Trennwand ein einstückiger Teil eines Kunststoff-Gehäusekörpers, der den Motorstator und/oder den Steuerungsraum radial umgibt. Hierdurch wird der zusätzliche Herstellungsaufwand für die Trennwand relativ gering gehalten.According to a preferred embodiment, the plastic partition wall is an integral part of a plastic housing body which radially surrounds the motor stator and / or the control room. As a result, the additional production cost for the partition is kept relatively low.

Vorzugsweise besteht der Spalttopf aus Metall, das eine gute Wärmeleitfähigkeit aufweist. Gegenüber einem Spalttopf aus Kunststoff weist ein Metall- Spalttopf den Vorteil auf, absolut dicht im Bezug auf Flüssigkeiten wie Wasser bzw. Wasserdampf zu sein, so dass ein Übertritt von Feuchtigkeit in den Steuerungsraum ausgeschlossen ist.Preferably, the containment shell is made of metal, which has a good thermal conductivity. Compared to a containment shell made of plastic, a metal containment shell has the advantage of being absolutely leakproof with respect to liquids such as water or water vapor, so that a transfer of moisture into the control room is excluded.

Gemäß einer bevorzugten Ausführungsform weist der Spalttopf einen im Wesentlichen in einer Querebene liegenden Topfboden auf, der mit dem Wärmeleiter unmittelbar in wärmeleitenden Kontakt steht. Der Wärmeleiter bzw. die Wärmeübertragungsöffnung liegt innerhalb der axialen Projektion des Topfbodens.According to a preferred embodiment, the containment shell has a substantially lying in a transverse plane pot bottom, which is in heat-conducting contact with the heat conductor directly. Of the Heat conductor or the heat transfer opening is within the axial projection of the pot bottom.

Vorzugsweise ist die Motorsteuerung auf einer in einer Querebene stehenden Platine angeordnet und weist die Motorsteuerung Leistungshalbleiter auf, die unmittelbar oder über separate Leitelemente mittelbar wärmeleitend mit dem Wärmeleiter verbunden sind. Wenn die Leistungshalbleiter auf der distalen Seite der Platine angeordnet sind, wird die Wärme durch die Leitelemente auf die proximale Seite der Platine geleitet. Die Leistungshalbleiter können alternativ auf der der Kunststoff-Trennwand zugewandten proximalen Seite der Platine angeordnet sein, so dass die Kühlfahnen der Leistungshalbleiter unmittelbar wärmeleitend mit den mit dem Wärmeleiter verbunden sind.Preferably, the motor control is arranged on a standing in a transverse plane board and has the motor control power semiconductors, which are directly or indirectly connected via separate guide elements thermally conductive to the heat conductor. When the power semiconductors are located on the distal side of the board, the heat is conducted through the routing elements to the proximal side of the board. Alternatively, the power semiconductors may be arranged on the proximal side of the board facing the plastic partition wall so that the cooling vanes of the power semiconductors are connected directly to the heat conductor with the heat conductor.

Besonders bevorzugt werden die Wärme-Leitelemente der Motorsteuerungs- Platine von Metallhülsen, mit einem Wärmeleiter gefüllten Metallhülsen und/oder Metallstiften gebildet, die in der Platine stecken. Die Leistungshalbleiter können in diesem Fall auf der distalen Seite der Platine angeordnet sein, wobei die Wärme-Leitelemente die thermische Verbindung durch die Platine hindurch zur proximalen Seite der Platine herstellen. Besonders bevorzugt sind die Leistungshalbleiter in nächster Nähe zu dem Wärmeleiter angeordnet, so dass die Wärmestrecke kurz und der absolute thermische Widerstand zwischen den Leistungshalbleitern und dem Wärmeleiter gering ist.The heat-conducting elements of the motor control board are particularly preferably formed by metal sleeves, metal sleeves filled with a heat conductor and / or metal pins which are inserted in the board. The power semiconductors may in this case be arranged on the distal side of the circuit board, wherein the heat conduction elements establish the thermal connection through the circuit board to the proximal side of the circuit board. Particularly preferably, the power semiconductors are arranged in close proximity to the heat conductor, so that the heat path is short and the absolute thermal resistance between the power semiconductors and the heat conductor is low.

Im Folgenden wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnungen näher erläutert. Es zeigen:

  • Figur 1 einen Längsschnitt einer elektrischen Kraftfahrzeug-Kühlmittelpumpe mit einer Kunststoff-Trennwand, die eine Wärmeübertragungsöffnung aufweist, in der ein Wärmeleiter angeordnet ist,
  • Figur 2 die proximale Seite der Trennwand der Figur 1 in perspektivischer Darstellung, und
  • Figur 3 die distale Seite der Trennwand der Figur 1 in perspektivischer Darstellung.
In the following an embodiment of the invention will be explained in more detail with reference to the drawings. Show it:
  • FIG. 1 a longitudinal section of an electric motor vehicle coolant pump with a plastic partition, the one Having heat transfer opening, in which a heat conductor is arranged,
  • FIG. 2 the proximal side of the dividing wall of the FIG. 1 in perspective, and
  • FIG. 3 the distal side of the dividing wall of the FIG. 1 in perspective view.

Die Figur 1 zeigt eine elektrische Kraftfahrzeug-Kühlmittelpumpe 10, die in einem Kühlkreislauf eines Kraftfahrzeugs beispielsweise dem Pumpen eines flüssigen Kühlmittels, beispielsweise Wasser, zur Kühlung eines Verbrennungsmotors oder eines anderen Aggregates dient.The FIG. 1 shows an electric motor vehicle coolant pump 10, which is used in a cooling circuit of a motor vehicle, for example, the pumping of a liquid coolant, such as water, for cooling an internal combustion engine or other aggregate.

Die Kühlmittelpumpe 10 weist in axialer Richtung drei Abschnitte auf, nämlich einen Pumpenabschnitt 12, einem daran angrenzenden Motorabschnitt 14 und einen an den Motorabschnitt 14 angrenzenden Steuerungsabschnitt 16. In dem Pumpenabschnitt 12 ist ein Pumpenrotor 20 angeordnet, das vorliegend als sogenannter Impeller ausgebildet ist und einen axialen zentralen Einlass aufweist und das Kühlmittel radial nach außen pumpt. Der Pumpenrotor 20 wird durch einen elektronisch kommutierten Antriebsmotor angetrieben, der im wesentlichen von einem permanentmagnetisch erregten Motorrotor 30 und diesen koaxial und ringförmig umgebenden Motorspulen 33 gebildet wird, die den Motorrotor 30, die den Motorstator 32 darstellen.The coolant pump 10 has three sections in the axial direction, namely a pump section 12, a motor section 14 adjoining thereto and a control section 16 adjoining the motor section 14. In the pump section 12, a pump rotor 20 is arranged, which in the present case is a so-called impeller axial central inlet and the coolant pumps radially outward. The pump rotor 20 is driven by an electronically commutated drive motor, which is essentially formed by a permanent magnetically excited motor rotor 30 and these coaxial and annular motor coils 33 surrounding the motor rotor 30, which constitute the motor stator 32.

Der Motorrotor 30 ist durch einen Metall- Spalttopf 40 hermetisch und flüssigkeitsdicht isoliert von dem Motorstator 32. Radial zwischen dem Motorrotor 30 und dem Motorstator 32 ist ein Zylinderkörper 44 des Spalttopfes 40 angeordnet, der in dem zylindrischen Magnetspalt zwischen dem Motorstator 32 und dem Motorrotor 30 liegt. Der Spalttopf 40 weist an das pumpenabgewandte Längsende des Motorrotors 30 angrenzend einen ringförmigen Topfboden 42 auf.The motor rotor 30 is hermetically and liquid-tight isolated from the motor stator 32 by a metal can 40. Radially between the motor rotor 30 and the motor stator 32, a cylinder body 44 of the split pot 40 is arranged in the cylindrical magnetic gap between the motor stator 32 and the motor rotor 30th lies. The containment shell 40 has adjacent to the pump facing away from the longitudinal end of the motor rotor 30 adjacent to an annular pot bottom 42.

Zwischen dem Motorabschnitt 14 und dem Steuerungsabschnitt 16 ist eine in einer Querebene angeordnete Kunststoff-Trennwand 50 vorgesehen, die eine fluiddichte Trennung des Motorabschnitts 14 von dem Steuerungsabschnitt 16 bildet, der durch eine elektronische Motorsteuerung 71 in einem Steuerungsraum 70 definiert ist. Die Kunststoff-Trennwand 50 ist ein einstückiger Teil eines Kunststoff-Gehäusekörpers 18, der im Wesentlichen zylindrisch ausgebildet ist und den Motorstator 32 und den Steuerungsraum 70 radial umgibt.Between the motor section 14 and the control section 16 there is provided a plastic partition wall 50 arranged in a transverse plane, which forms a fluid-tight separation of the motor section 14 from the control section 16 defined by an electronic motor control 71 in a control room 70. The plastic partition wall 50 is an integral part of a plastic housing body 18 which is substantially cylindrical and radially surrounds the motor stator 32 and the control room 70.

Die Kunststoff-Trennwand 50 weist eine Wärmeübertragungsöffnung 64 auf, die durch einen Hülsenkörper 60 axial über die axiale Dicke der Trennwand 50 hinaus zu beiden Seiten verlängert ist, so dass auf der proximalen Seite ein proximaler Kragen 63 und auf der distalen Seite ein distaler Kragen 62 realisiert ist. Die auf diese Weise gebildete langgestreckte Wärmeübertragungsöffnung 64 ist vollständig ausgefüllt mit einem Wärmeleiter 66, der aus einem ausgehärteten Wärmeleitkleber besteht. Der Wärmeleitkleber weist eine gute spezifische Wärmeleitfähigkeit auf und bildet einen elektrischen Isolator.The plastic partition wall 50 has a heat transfer opening 64, which is extended by a sleeve body 60 axially beyond the axial thickness of the partition 50 on both sides, so that on the proximal side a proximal collar 63 and on the distal side a distal collar 62nd is realized. The elongate heat transfer opening 64 formed in this way is completely filled with a heat conductor 66, which consists of a cured Wärmeleitkleber. The thermal adhesive has a good specific thermal conductivity and forms an electrical insulator.

Die Motorsteuerung 71 in dem Steuerungsraum 70 weist eine in einer Querebene liegende Platine 73 auf, die die elektronischen Bauelemente trägt, zu denen auch mehrere Leistungshalbleiter 72 zählen. Die Leistungshalbleiter 72 sind auf der distalen Seite der Platine 73 angeordnet, also auf der der Trennwand 50 abgewandten Seite der Platine 73. Die Leistungshalbleiter 72 sind gehäuft und auf eine kleine Fläche konzentriert angeordnet, und zwar in axialer Flucht mit dem Wärmeleiter 66.The motor controller 71 in the control room 70 has a board 73 lying in a transverse plane, which carries the electronic components, which also include a plurality of power semiconductors 72. The power semiconductors 72 are arranged on the distal side of the circuit board 73, ie on the side of the circuit board 73 facing away from the dividing wall 50. The power semiconductors 72 are heaped and concentrated in a small area, in axial alignment with the heat conductor 66.

Die Platine 73 ist im Bereich der Leistungshalbleiter 72 mehrfach mit Leitelementen 74 in Form von mit einer Wärmeleitmasse gefüllten Metall-Hülsen oder Metall-Stiften durchkontaktiert, so dass die von den Leistungshalbleitern 72 generierte Wärme über ihre Kühlflächen und die Leitelemente 74 zur proximalen Seite der Platine 73 geleitet wird. Auf der proximalen Seite der Platine 73 ist eine metallische Sammelfläche 76 aufgebracht, die auf der proximalen Leiterplatten-Seite die thermische Verbindung zwischen den Leitelementen 74 herstellt. Der Wärmeleiter 66 ist unmittelbar mit der Sammelfläche 76 thermisch derart verbunden, dass insgesamt ein geringer thermischer Widerstand realisiert ist.In the area of the power semiconductors 72, the circuit board 73 is repeatedly through-plated with guide elements 74 in the form of metal sleeves or metal pins filled with a heat-conducting compound, so that the heat generated by the power semiconductors 72 via their cooling surfaces and the guide elements 74 to the proximal side of the board 73 is headed. On the proximal side of the board 73, a metallic collecting surface 76 is applied, which establishes the thermal connection between the guide elements 74 on the proximal side of the printed circuit board. The heat conductor 66 is thermally connected directly to the collecting surface 76 such that overall a low thermal resistance is realized.

Claims (11)

  1. Electrically operated motor vehicle coolant pump (10) comprising
    a pump rotor (20),
    a motor portion (14) with a permanent-magnet motor rotor (30), a motor stator (32) comprising motor coils (33) and a can (40) separating the motor stator (32) from the motor rotor (30) in a liquid-tight manner, and
    a control portion (16) comprising a control chamber (70) in which the motor control (71) is arranged,
    characterized in that
    the control chamber (70) is separated from the motor portion (14) by a plastic partition wall (50) lying substantially in a transversal plane,
    the partition wall (50) comprises a heat transfer opening (64) in which a heat conductor (66) is arranged, one longitudinal end thereof being in heat-conducting contact with the can (40) and the other longitudinal end thereof being in heat-conducting contact with the motor controller (71), and
    the specific thermal conductivity of the heat conductor (66) is higher than the specific thermal conductivity of the plastic material of the partition wall.
  2. Electrically operated motor vehicle coolant pump (10) of claim 1, wherein the heat transfer port (64) is formed by a sleeve body (60) whose axial length substantially corresponds to the axial distance between the can (40) and the motor controller (71).
  3. Electrically operated motor vehicle coolant pump (10) of one of the preceding claims, wherein the heat conductor (66) is formed by a thermally conductive adhesive which closes the heat transfer port (64) completely.
  4. Electrically operated motor vehicle coolant pump (10) of one of the preceding claims, wherein the heat conductor (66) is formed by a solid body.
  5. Electrically operated motor vehicle coolant pump (10) of one of the preceding claims, wherein the heat conductor (66) is an electrical insulator.
  6. Electrically operated motor vehicle coolant pump (10) of one of the preceding claims, wherein the plastic partition wall (50) forms the only separation between the motor coils (33) and the control chamber (70).
  7. Electrically operated motor vehicle coolant pump (10) of one of the preceding claims, wherein the plastic partition wall (50) is an integral part of a plastic housing body (18) radially surrounding the motor stator (32) and/or the control chamber (70).
  8. Electrically operated motor vehicle coolant pump (10) of one of the preceding claims, wherein the can (40) is made of metal.
  9. Electrically operated motor vehicle coolant pump (10) of one of the preceding claims, wherein the can (40) has a pot bottom (42) lying substantially in a transverse plane, the bottom being in immediate heat-conducting contact with the heat conductor (66).
  10. Electrically operated motor vehicle coolant pump (10) of one of the preceding claims, wherein the motor controller (71) is arranged on a circuit board (73) which stands in a transversal plane, and comprises power semiconductors (72) which are in connected in a thermally conductive manner to the heat conductor (66), either directly or via conductor elements (74).
  11. Electrically operated motor coolant pump (10) of one of the preceding claims, wherein the conductor elements (74) are formed by metal sleeves and/or metal pins plugged into the circuit board (73).
EP14154591.3A 2014-02-11 2014-02-11 Electrically operated motor vehicle coolant pump Active EP2905471B1 (en)

Priority Applications (2)

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EP14154591.3A EP2905471B1 (en) 2014-02-11 2014-02-11 Electrically operated motor vehicle coolant pump
PCT/EP2015/051395 WO2015121051A1 (en) 2014-02-11 2015-01-23 Electric motor vehicle coolant pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14154591.3A EP2905471B1 (en) 2014-02-11 2014-02-11 Electrically operated motor vehicle coolant pump

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EP2905471A1 EP2905471A1 (en) 2015-08-12
EP2905471B1 true EP2905471B1 (en) 2019-10-09

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016206406A1 (en) 2016-04-15 2017-10-19 Bühler Motor GmbH Pump motor with a containment shell
EP3339656B1 (en) * 2016-12-22 2020-11-11 Grundfos Holding A/S Pump unit
WO2018113965A1 (en) * 2016-12-22 2018-06-28 Pierburg Pump Technology Gmbh Automotive electrical gas pump
IT201700117896A1 (en) * 2017-10-18 2019-04-18 Taco Italia S R L Fluid circulator
DE102020201306A1 (en) * 2019-10-15 2021-04-15 Vitesco Technologies GmbH Fluid pump
CN111852888A (en) * 2020-07-28 2020-10-30 安徽天富泵阀有限公司 Shielding pump system
WO2022128060A1 (en) 2020-12-14 2022-06-23 Pierburg Pump Technology Gmbh Automotive electrical liquid pump

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5949171A (en) * 1998-06-19 1999-09-07 Siemens Canada Limited Divisible lamination brushless pump-motor having fluid cooling system
JP4084351B2 (en) * 2004-12-24 2008-04-30 株式会社日立製作所 Motor-integrated internal gear pump and electronic equipment
WO2012077246A1 (en) * 2010-12-07 2012-06-14 三菱電機株式会社 Motor with embedded power conversion circuit, liquid pump in which this motor with embedded power conversion circuit is installed, air conditioner in which this liquid pump is installed, water heater in which this liquid pump is installed, and equipment in which motor with embedded power conversion cicuit is installed
EP2469102B1 (en) 2010-12-22 2017-08-02 Pierburg Pump Technology GmbH Motor vehicle coolant pump
JP2013099021A (en) * 2011-10-28 2013-05-20 Mitsubishi Electric Corp Pump and heat pump device

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