EP3871317A1 - Electric motor for driving working machines having media separation - Google Patents

Electric motor for driving working machines having media separation

Info

Publication number
EP3871317A1
EP3871317A1 EP19820733.4A EP19820733A EP3871317A1 EP 3871317 A1 EP3871317 A1 EP 3871317A1 EP 19820733 A EP19820733 A EP 19820733A EP 3871317 A1 EP3871317 A1 EP 3871317A1
Authority
EP
European Patent Office
Prior art keywords
ball bearing
motor
electric motor
housing
pot
Prior art date
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.)
Pending
Application number
EP19820733.4A
Other languages
German (de)
French (fr)
Inventor
Michael Kisch
Wilhelm Weisser
Jens Löffler
Jochen Scheffczyk
Marcus Hellmann
Michael Bitzer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebm Papst St Georgen GmbH and Co KG
Original Assignee
Ebm Papst St Georgen GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebm Papst St Georgen GmbH and Co KG filed Critical Ebm Papst St Georgen GmbH and Co KG
Publication of EP3871317A1 publication Critical patent/EP3871317A1/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular magnets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
    • H02K21/16—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures having annular armature cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1732—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/223—Heat bridges
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/227—Heat sinks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2211/00—Specific aspects not provided for in the other groups of this subclass relating to measuring or protective devices or electric components
    • H02K2211/03—Machines characterised by circuit boards, e.g. pcb

Definitions

  • the invention relates to an electric motor for driving work machines with the necessary media separation, as is e.g. is the case with pumps, centrifuges or separators.
  • the invention is therefore based on the object of providing an electric motor as a drive for work machines with media separation which, in addition to separating motor electronics from the motor shaft, has improved heat dissipation for the ball bearing supporting the motor shaft.
  • an electric motor with a motor housing which has a shaft section for receiving a motor shaft and a motor section for receiving motor electronics and motor windings.
  • the shaft section and the motor section are separated from one another in a sealed manner by a can arranged in the motor housing in order to ensure media separation.
  • an inner rotor rotor and axially thereafter a metallic ball bearing pot are arranged in the containment shell, a ball bearing for mounting the motor shaft and the inner rotor rotor being fastened in the ball bearing pot.
  • the inner rotor rotor is specially designed and has a shaft passage that forms an axial stop surface.
  • the axial stop surface can take place, for example, by a recess of the inner lateral surface, which forms a step.
  • a press bushing is arranged in the shaft passage, abutting the stop surface, into which the motor shaft can be pressed.
  • the shaft passage is preferably realized by a plastic encapsulation of a ferrite permanent magnet, into which the press bushing can be radially pressed at least to a certain extent in the event of a radial widening and accompanying enlargement of its outer diameter.
  • the containment can is used to separate the shaft section and the motor section and to prevent gas exchange between the crankcase and the electronics or motor windings.
  • polyphenylene sulfide is suitable as the material.
  • the containment shell with the ball bearing pot arranged therein leads to a structure in which the ball bearing must be packed in a very central manner and can dissipate little of its heat generated during operation.
  • the heat is dissipated according to the invention by connecting the containment shell and ball bearing pot with the ball bearing accommodated therein to the motor housing, in particular the housing cover.
  • the containment shell is formed in one piece by the motor housing around an axis of rotation of the motor shaft. This ensures a seal without additional sealing elements.
  • the motor housing forms a circumferential outer wall, which is adjoined on one axial side by an axial wall into which the containment shell is sunk.
  • the containment shell is preferably of hollow-cylindrical design with sections of different diameters, the ball bearing pot being arranged in the section which extends axially furthest into the motor housing.
  • an embodiment is favorable in which the containment shell and the ball bearing pot are of identical shape in the section of the containment shell in which the ball bearing pot is arranged. In other words, the ball bearing pot and the containment shell determine the same outer contours.
  • a gap between the housing cover and the containment shell has a gap dimension of zero.
  • the housing cover is thus directly against the containment can.
  • the ball bearing pot which in turn is located in the containment shell, is thus also in direct connection to the housing cover, so that the heat from the ball bearing pot is transferred to the Containment shell on the housing cover to the outside environment is derived.
  • the gap between the housing cover and the containment shell has a small gap dimension, which is up to a size of 1/20 of the maximum outer diameter of the ball bearing.
  • the small gap affects the heat dissipation from the ball bearing cup to the. Hardly any housing cover, but allows a relative arrangement of the components without contact.
  • An embodiment of the electric motor is also advantageous, in which a thermal paste or a thermal adhesive is provided between the containment shell and the housing cover.
  • the thermal paste preferably forms an intermediate layer and enables the housing cover to be thermally bonded to the containment shell without the components touching one another. Vibrations of the individual components thus remain decoupled from one another.
  • a thermal adhesive in addition to the advantageous effect of the thermal paste, the bonded connection of the housing cover to the containment shell can also take place.
  • the housing cover is detachably attached to the motor housing and is placed on an axial side of the rest of the motor housing.
  • the housing cover thus forms the section of the motor housing which is indirectly connected to the ball bearing pot and thus the ball bearing via the containment shell.
  • the containment shell is formed in one piece with the motor housing, the components of the electric motor can be mounted on the side axially opposite the containment shell, on which the housing cover is removably positioned.
  • the solution with a housing cover as a heat sink offers the large area for heat dissipation to the outside environment.
  • a plug device with connections to the motor electronics is also advantageously provided integrally, in which customer the specific plug can be inserted.
  • the communication interface can also be integrated into the plug device.
  • the performance of heat dissipation is further improved in the electric motor in a variant in which the housing cover has a cooling element projecting axially in the direction of the outside environment, which locally increases the cooling surface of the housing cover.
  • a plurality of cooling fins arranged over the housing cover are preferably formed on the housing cover as a cooling element.
  • the cooling fins can, in particular, be formed in one piece on the housing cover or alternatively can be firmly attached to it. It is also advantageous if several of the cooling fins, viewed in axial projection, extend over the ball bearing pot, so that the locally occurring heat at the ball bearing pot is conducted particularly quickly and effectively to the outside environment.
  • the gap can be assigned to improve the performance of the heat dissipation in that the heat sink projecting from the housing cover to the ball bearing cup is formed, which locally increases a connection surface to the ball bearing cup indirectly via the gap pot.
  • the cooling body is cylindrical or conical with an axial connection surface to an axial outer wall surface of the containment shell.
  • the heat of the ball bearing is thus transferred from the ball bearing pot to the containment shell, then further from its axial outer wall surface to the connecting surface of the cylindrical heat sink and finally to the entire surface of the housing cover including the cooling elements.
  • the heat dissipation is also favored by the fact that the housing cover is made of metal or thermally conductive plastic.
  • the ball bearing cup forms a ball bearing seat into which the ball bearing is pressed.
  • a variant of the electric motor is characterized in that the ball bearing pot has a free space between the ball bearing and the section of the motor housing that is connected to the external environment.
  • the ball bearing can thus immediately give off heat to the air in the free space and is not in direct contact with the Axialflä surface of the ball bearing pot, which rests on the containment shell and the heat sink.
  • the containment shell extends axially through the motor housing to the housing cover.
  • the containment shell thus determines in the axial direction, i. H. along the axis of rotation of the motor shaft, a significant part of the motor housing located centrally around the axis of rotation.
  • the containment shell preferably extends in the axial direction over 60-95%, more preferably over 70-95%, even more preferably over 80-90% of the total axial extent of the motor housing.
  • the motor housing and the containment shell are formed from plastic and the metallic ball bearing cup is extrusion-coated directly with the plastic.
  • the windings enclose the containment shell in the circumferential direction.
  • the windings are arranged axially spaced from the ball bearing.
  • the heat development of the motor windings remains separate from that of the ball bearing.
  • Another advantage for a compact design of the electric motor is that the motor electronics are arranged axially on one side on a circuit board which has a central opening and which protrudes from the housing cover. the heat sink extends through the central opening.
  • the containment shell extends through the central opening.
  • Fig. 1 is a side sectional view through an electric motor
  • Embodiment; 2 shows a detailed view from FIG. 1.
  • an embodiment of an electric motor 1 according to the invention is shown in a side sectional view or detailed view.
  • the electric motor 1 comprises the one-piece motor housing 2 formed from PPS (polyphenylene sulfide) with the housing cover 3, which can be fastened axially on the motor housing 2 and forms a part of the motor housing when fastened.
  • the motor housing 2 forms in one piece the can 7 extending axially into the interior of the motor housing 2.
  • the motor section Between the inner wall of the motor housing 2 and the outer casing of the containment shell 7 is the motor section in which the motor windings 6 and the motor electronics 5 axially fixed on one side to the printed circuit board 14 are accommodated.
  • the components of the motor electronics 5 extend in the hollow spaces of the motor section in the direction of the motor windings 6.
  • the shaft section delimited in a sealed manner via the containment shell 7, contains the shaft section within the containment shell 7, in which the motor shaft 4 comes into contact, in which the motor shaft 4 runs along its axis of rotation .
  • the can 7 extends in the axial direction essentially through the entire motor housing 2 to the housing cover 3.
  • the plug device 77 with connections, which are connected to the motor electronics 5 on the printed circuit board 14, is integrated on the motor housing 2 for connecting the customer-specific plug.
  • the inner rotor rotor 44 is positioned in the containment shell 7, the ferrite permanent magnet 55 of which is provided with a plastic encapsulation which defines its inner surface, which forms the shaft passage for the motor shaft 4.
  • the press bushing 22 is arranged on the inner lateral surface and is supported on an axial stop (not shown) in order to be able to press in the motor shaft 4.
  • the ball bearing pot 8 which is formed from a thermally conductive material, in particular from metal, is arranged.
  • the motor housing 2 with the can 7 is injection molded from plastic in an injection molding process around the ball bearing pot 8, so that the can 7 and the ball bearing pot 8 have the same shape or inner and outer contours and abut one another directly.
  • the ball bearing cup 8 determines the bearing seat for the pressed-in ball bearing 9, in which the motor shaft 4 is mounted.
  • the free space 13 is formed, into which the motor shaft 4 extends with its free end.
  • a cooling body 11 protruding axially in the direction of the ball bearing cup 8 in the form of a cylinder made of solid material is integrally formed on the housing cover 3 around the axis of rotation.
  • Axial between the cooling element 11 and the axial outer wall surface of the can 7 is the gap 121 with a gap dimension of a maximum of 1/20 of the outer diameter of the ball bearing.
  • a gap of the thermal paste 10 is provided in the gap 121, which layer can also be replaced by thermal adhesive is cash.
  • the heat dissipation of the heat generated by the ball bearing 9 during operation takes place from the ball bearing 9 to the ball bearing pot 8, further to the split pot 7 and in the axial direction via the thermal paste 10 to the heat sink 11 of the housing cover 3 of the motor housing 2. From the housing cover 3 the heat is given off to the outside environment.
  • the motor housing and in particular its housing cover 3 thus function as a heat sink.
  • the thermal paste 10 is dispensed with and the heat sink 11 makes direct contact with the can 7.
  • the gap 121 then has a gap dimension of zero.
  • the can 7 is hollow cylindrical and divided into three axial sections, each with different inner diameters.
  • the free space 13 is in the area of the smallest diameter, the bearing seat with the ball bearing 9 in the middle area and the motor windings 6 are arranged radially around the containment shell 7 in the area of the largest inside diameter.
  • the ball bearing 9 is thus seen from the motor windings 5 in the axial direction without overlap.
  • the printed circuit board 14 determines the central opening 15 about the axis of rotation of the motor shaft 4, through which the cooling body 11 projecting axially from the housing cover 3 extends in the axial direction to the containment shell 7.
  • the area of the smallest diameter of the can 7 extends through the opening 15 or at least into the opening 15, so that the contact between the can 7 and the heat sink 11 at the level of the circuit board 14 or axially above the circuit board 14.
  • the housing cover 3 be designed without a heat sink 11 and the containment shell 7 directly or via the thermal paste 10 or the heat sink. to bring the glue adhesive to the axial inner wall of the housing cover 3.
  • the housing cover 3 forms a plurality of cooling fins 111 which are arranged distributed over its surface facing the external environment and which are partly in the center, i.e. Seen in axial projection over the ball bearing pot 8 extend. As a result, the heat falling in the region of the ball bearing pot 8 is conducted more quickly to the outside environment.

Abstract

The invention relates to an electric motor comprising a motor casing (2) that includes a shaft portion for accommodating a motor shaft (4), and a motor portion in which motor electronics (5) and motor windings (6) are arranged, the shaft portion and the motor portion being separated from each other in a sealed manner by a can (7) that is arranged in the motor casing (2). An inner rotor and, axially adjacent thereto, a metal ball bearing pot (8) are arranged in the shaft portion of the can (7), and a ball bearing (9) for mounting the motor shaft (4) is secured in the ball bearing pot (8).

Description

Elektromotor zum Antrieb von Arbeitsmaschinen mit Medientrennung Electric motor for driving work machines with media separation
Beschreibung: Description:
Die Erfindung betrifft einen Elektromotor zum Antrieb von Arbeitsmaschinen mit notwendiger Medientrennung, wie es z.B. bei Pumpen, Zentrifugen oder Ascheidern der Fall ist. The invention relates to an electric motor for driving work machines with the necessary media separation, as is e.g. is the case with pumps, centrifuges or separators.
Bei derartigen Elektromotoren, die eine hohe Drehzahl der Motorwelle er zeugen, steigt die Verlustleistung des die Motorwelle lagernden Kugellagers aufgrund von starker Wärmeentwicklung deutlich an. Vor allem bei kompakten Ausführungen des Elektromotors, bei denen das Kugellager unmittelbar angrenzend zu vielen weiteren Bauteilen angeordnet ist, kann die erzeugte Wärme nicht in ausreichendem Maße abgeführt werden. In such electric motors, which testify to a high speed of the motor shaft, the power loss of the ball bearing supporting the motor shaft increases significantly due to the strong heat development. Especially in compact versions of the electric motor, in which the ball bearing is arranged directly adjacent to many other components, the generated one can Sufficient heat cannot be dissipated.
Der Erfindung liegt deshalb die Aufgabe zugrunde, einen Elektromotor als Antrieb von Arbeitsmaschinen mit Medientrennung bereit zu stellen, der neben einer Trennung von Motorelektronik gegenüber der Motorwelle eine ver- besserte Wärmeableitung für das die Motorwelle lagernde Kugellager auf weist. The invention is therefore based on the object of providing an electric motor as a drive for work machines with media separation which, in addition to separating motor electronics from the motor shaft, has improved heat dissipation for the ball bearing supporting the motor shaft.
Diese Aufgabe wird durch die Merkmalskombination gemäß Patentanspruch 1 gelöst. This object is achieved by the combination of features according to claim 1.
Erfindungsgemäß wird ein Elektromotor mit einem Motorgehäuse vorge- schlagen, das einen Wellenabschnitt zur Aufnahme einer Motorwelle und einen Motorabschnitt zur Aufnahme einer Motorelektronik und von Motorwicklungen aufweist. Der Wellenabschnitt und der Motorabschnitt sind durch einen in dem Motorgehäuse angeordneten Spalttopf voneinander abgedichtet getrennt, um die Medientrennung sicherzustellen. In dem Wellenabschnitt sind in dem Spalttopf ein Innenläufer-Rotor und axial daran anschließend ein metallischer Kugellagertopf angeordnet, wobei in dem Kugellagertopf ein Ku gellager zur Lagerung der Motorwelle und des Innenläufer-Rotors befestigt ist. Der Innenläufer-Rotor ist besonders gestaltet und weist einen Wellendurchgang auf, der eine axiale Anschlagfläche bildet. Die axiale Anschlagflä- che kann beispielsweise durch einen Rücksprung der Innenmantelfläche erfolgen, der eine Stufe ausbildet. Zudem ist in dem Wellendurchgang an der Anschlagfläche anliegend eine Pressbuchse angeordnet, in welche die Motorwelle einpressbar ist. According to the invention, an electric motor with a motor housing is proposed which has a shaft section for receiving a motor shaft and a motor section for receiving motor electronics and motor windings. The shaft section and the motor section are separated from one another in a sealed manner by a can arranged in the motor housing in order to ensure media separation. In the shaft section, an inner rotor rotor and axially thereafter a metallic ball bearing pot are arranged in the containment shell, a ball bearing for mounting the motor shaft and the inner rotor rotor being fastened in the ball bearing pot. The inner rotor rotor is specially designed and has a shaft passage that forms an axial stop surface. The axial stop surface can take place, for example, by a recess of the inner lateral surface, which forms a step. In addition, a press bushing is arranged in the shaft passage, abutting the stop surface, into which the motor shaft can be pressed.
Der Wellendurchgang wird vorzugsweise durch eine Kunststoffumspritzung eines Ferrit-Permanentmagneten realisiert, in den die Pressbuchse bei einer radialen Aufweitung und einhergehenden Vergrößerung ihres Außendurchmessers zumindest ein Stück weit radial eindrückbar ist. Der Spalttopf wird verwendet, um den Wellenabschnitt und den Motorabschnitt zu trennen und einen Gasaustausch zwischen Kurbelgehäuse und Elektronik bzw. Motorwicklungen zu verhindern. Als Material eignet sich bei spielsweise Polyphenylensulfid. Der Spalttopf mit dem darin angeordneten Kugellagertopf führt jedoch zu einem Aufbau, bei dem das Kugellager stark zentral eingepackt angeordnet werden muss und wenig seiner im Betrieb erzeugten Wärme nach außen abführen kann. Die Wärmeableitung erfolgt erfindungsgemäß durch eine Anbindung des Spalttopfes und Kugellagertopfes mit dem darin aufgenomme- nen Kugellager an das Motorgehäuse, insbesondere den Gehäusedeckel. The shaft passage is preferably realized by a plastic encapsulation of a ferrite permanent magnet, into which the press bushing can be radially pressed at least to a certain extent in the event of a radial widening and accompanying enlargement of its outer diameter. The containment can is used to separate the shaft section and the motor section and to prevent gas exchange between the crankcase and the electronics or motor windings. For example, polyphenylene sulfide is suitable as the material. However, the containment shell with the ball bearing pot arranged therein leads to a structure in which the ball bearing must be packed in a very central manner and can dissipate little of its heat generated during operation. The heat is dissipated according to the invention by connecting the containment shell and ball bearing pot with the ball bearing accommodated therein to the motor housing, in particular the housing cover.
In einer Ausführungsvariante des Elektromotors ist vorgesehen, dass der Spalttopf einstückig durch das Motorgehäuse um eine Rotationsachse der Motorwelle gebildet ist. Somit ist eine Abdichtung ohne zusätzliche Dichtelemente gewährleistet. Insbesondere bildet das Motorgehäuse eine umlaufen- de Außenwandung, an die sich auf einer axialen Seite eine Axialwandung anschließt, in die der Spalttopf eingesenkt wird. Der Spalttopf ist vorzugsweise hohlzylindrisch mit Abschnitten unterschiedlichen Durchmessers ausgebildet, wobei im axial am weitesten in das Motorgehäuse hineinragenden Abschnitt der Kugellagertopf angeordnet ist. Dabei ist eine Ausführung günstig, bei welcher der Spalttopf und der Kugellagertopf in dem Abschnitt des Spalttopfes, in dem der Kugellagertopf ange ordnet ist, formidentisch ausgebildet sind. In anderen Worten bestimmen der Kugellagertopf und der Spalttopf dieselben Außenkonturen. In one embodiment variant of the electric motor, it is provided that the containment shell is formed in one piece by the motor housing around an axis of rotation of the motor shaft. This ensures a seal without additional sealing elements. In particular, the motor housing forms a circumferential outer wall, which is adjoined on one axial side by an axial wall into which the containment shell is sunk. The containment shell is preferably of hollow-cylindrical design with sections of different diameters, the ball bearing pot being arranged in the section which extends axially furthest into the motor housing. In this case, an embodiment is favorable in which the containment shell and the ball bearing pot are of identical shape in the section of the containment shell in which the ball bearing pot is arranged. In other words, the ball bearing pot and the containment shell determine the same outer contours.
Ein Spalt zwischen dem Gehäusedeckel und dem Spalttopf weist in einer ersten Ausführungsvariante ein Spaltmaß von Null auf. Der Gehäusedeckel liegt somit unmittelbar an dem Spalttopf an. Der wiederum in dem Spalttopf befindliche Kugellagertopf liegt somit ebenfalls in unmittelbarer Anbindung an den Gehäusedeckel, so dass die Wärme von dem Kugellagertopf über den Spalttopf auf den Gehäusedeckel an die Außenumgebung abgeleitet wird. In a first embodiment variant, a gap between the housing cover and the containment shell has a gap dimension of zero. The housing cover is thus directly against the containment can. The ball bearing pot, which in turn is located in the containment shell, is thus also in direct connection to the housing cover, so that the heat from the ball bearing pot is transferred to the Containment shell on the housing cover to the outside environment is derived.
In einer alternativen Ausführung weist der Spalt zwischen dem Gehäusede ckel und dem Spalttopf ein geringes Spaltmaß auf, das bis zu einer Größe von 1/20 des maximalen Außendurchmessers des Kugellagers ist. Der ge- ringe Spalt beeinträchtigt die Wärmeabfuhr von dem Kugellagertopf auf den . Gehäusedeckel kaum, ermöglich jedoch eine relative Anordnung der Bauteile, ohne Berührung. In an alternative embodiment, the gap between the housing cover and the containment shell has a small gap dimension, which is up to a size of 1/20 of the maximum outer diameter of the ball bearing. The small gap affects the heat dissipation from the ball bearing cup to the. Hardly any housing cover, but allows a relative arrangement of the components without contact.
Vorteilhaft ist ferner eine Ausführung des Elektromotors, bei der zwischen dem Spalttopf und dem Gehäusedeckel eine Wärmeleitpaste oder ein Wär- meleitkleber vorgesehen ist. Die Wärmeleitpaste bildet vorzugsweise eine Zwischenschicht und ermöglicht eine Wärmeanbindung des Gehäusedeckels an den Spalttopf, ohne dass sich die Bauteile berühren. Somit bleiben Vibrationen der einzelnen Bauteile voneinander entkoppelt. Bei der Nutzung eines Wärmeleitklebers kann neben der vorteilhaften Wirkung der Wärmeleitpaste zusätzlich die verklebte Anbindung von Gehäusedeckel an den Spalttopf erfolgen. An embodiment of the electric motor is also advantageous, in which a thermal paste or a thermal adhesive is provided between the containment shell and the housing cover. The thermal paste preferably forms an intermediate layer and enables the housing cover to be thermally bonded to the containment shell without the components touching one another. Vibrations of the individual components thus remain decoupled from one another. When using a thermal adhesive, in addition to the advantageous effect of the thermal paste, the bonded connection of the housing cover to the containment shell can also take place.
Der Gehäusedeckel ist in einem Ausführungsbeispiel lösbar an dem Motorgehäuse befestigt und wird auf eine axiale Seite des übrigen Motorgehäuses aufgesetzt. Der Gehäusedeckel bildet somit den Abschnitt des Motorgehäu- ses, der mittelbar über den Spalttopf mit dem Kugellagertopf und mithin dem Kugellager in Verbindung steht. Soweit der Spalttopf mit dem Motorgehäuse einstückig gebildet ist, kann die Montage der Bauteile des Elektromotors über die axial dem Spalttopf gegenüberliegende Seite erfolgen, auf welcher der Gehäusedeckel abnehmbar positioniert wird. Gleichzeitig bietet die Lösung mit einem Gehäusedeckel als Kühlkörper die große Fläche zur Wärmeableitung an die Außenumgebung. In one embodiment, the housing cover is detachably attached to the motor housing and is placed on an axial side of the rest of the motor housing. The housing cover thus forms the section of the motor housing which is indirectly connected to the ball bearing pot and thus the ball bearing via the containment shell. If the containment shell is formed in one piece with the motor housing, the components of the electric motor can be mounted on the side axially opposite the containment shell, on which the housing cover is removably positioned. At the same time, the solution with a housing cover as a heat sink offers the large area for heat dissipation to the outside environment.
An dem Motorgehäuse ist zudem vorteilhafterweise integral eine Steckvor richtung mit Anschlüssen an die Motorelektronik vorgesehen, in welche kun- denspezifische Stecker einsteckbar sind. In die Steckvorrichtung ist zudem auch die Kommunikationsschnittstelle integrierbar. On the motor housing, a plug device with connections to the motor electronics is also advantageously provided integrally, in which customer the specific plug can be inserted. The communication interface can also be integrated into the plug device.
Die Leistung der Wärmeableitung wird bei dem Elektromotor in einer Variante noch verbessert, bei welcher der Gehäusedeckel ein axial in Richtung der Außenumgebung vorstehendes Kühlelement aufweist, das die Abkühlober fläche des Gehäusedeckels lokal vergrößert. Vorzugsweise sind an dem Ge häusedeckel als Kühlelement eine Vielzahl von über den Gehäusedeckel verteilt angeordneten Kühlrippen ausgebildet. Die Kühlrippen können insbesondere einstückig an dem Gehäusedeckel ausgebildet oder alternativ daran stoffschlüssig befestigt werden. Dabei ist zudem günstig, wenn mehrere der Kühlrippen in axialer Projektion gesehen den Kugellagertopf überstrecken, so dass die lokal anfallende Wärme am Kugellagertopf besonders schnell und effektiv an die Außenumgebung geleitet wird. The performance of heat dissipation is further improved in the electric motor in a variant in which the housing cover has a cooling element projecting axially in the direction of the outside environment, which locally increases the cooling surface of the housing cover. A plurality of cooling fins arranged over the housing cover are preferably formed on the housing cover as a cooling element. The cooling fins can, in particular, be formed in one piece on the housing cover or alternatively can be firmly attached to it. It is also advantageous if several of the cooling fins, viewed in axial projection, extend over the ball bearing pot, so that the locally occurring heat at the ball bearing pot is conducted particularly quickly and effectively to the outside environment.
Auch in die axial gegenüberliegende Richtung, d.h. dem Spalttopf zuweisend wird in einer Ausführung des Elektromotors die Leistung der Wärmeableitung dadurch verbessert, dass an dem Gehäusedeckel zum Kugellagertopf vorstehender Kühlkörper ausgebildet ist, das mittelbar über den Spalttopf eine Anbindungsfläche an den Kugellagertopf lokal vergrößert. Also in the axially opposite direction, i.e. In an embodiment of the electric motor, the gap can be assigned to improve the performance of the heat dissipation in that the heat sink projecting from the housing cover to the ball bearing cup is formed, which locally increases a connection surface to the ball bearing cup indirectly via the gap pot.
Als vorteilhafte Ausführung ist vorgesehen, dass der Kühlkörper zylindrisch oder konusförmig mit einer axialen Anbindungsfläche an eine axiale Außen wandfläche des Spalttopfes ausgebildet ist. Somit überträgt sich die Wärme des Kugellagers von dem Kugellagertopf auf den Spalttopf, dann weiter von dessen axialer Außenwandfläche an die Anbindungsfläche des zylindrischen Kühlkörpers und schließlich an die gesamte Fläche des Gehäusedeckels inklusive der Kühlelemente. As an advantageous embodiment it is provided that the cooling body is cylindrical or conical with an axial connection surface to an axial outer wall surface of the containment shell. The heat of the ball bearing is thus transferred from the ball bearing pot to the containment shell, then further from its axial outer wall surface to the connecting surface of the cylindrical heat sink and finally to the entire surface of the housing cover including the cooling elements.
Die Wärmeableitung wird zudem dadurch begünstigt, dass der Gehäusedeckel aus Metall oder wärmeleitendem Kunststoff gebildet ist. Der Kugellagertopf bildet in einer bevorzugten Ausführung einen Kugellagersitz, in den das Kugellager eingepresst ist. The heat dissipation is also favored by the fact that the housing cover is made of metal or thermally conductive plastic. In a preferred embodiment, the ball bearing cup forms a ball bearing seat into which the ball bearing is pressed.
Zudem ist eine Variante des Elektromotors dadurch gekennzeichnet, dass der Kugellagertopf zwischen dem Kugellager und dem mit der Außenumge- bung in Verbindung stehenden Abschnitt des Motorgehäuses einen Freiraum aufweist. Das Kugellager kann somit unmittelbar Wärme an die Luft in den Freiraum abgeben und steht nicht in unmittelbarem Kontakt mit der Axialflä che des Kugellagertopfes, die an dem Spalttopf und dem Kühlkörper anliegt. In addition, a variant of the electric motor is characterized in that the ball bearing pot has a free space between the ball bearing and the section of the motor housing that is connected to the external environment. The ball bearing can thus immediately give off heat to the air in the free space and is not in direct contact with the Axialflä surface of the ball bearing pot, which rests on the containment shell and the heat sink.
Ferner ist bei dem Elektromotor in einer Weiterbildung vorgesehen, dass sich der Spalttopf axial durch das Motorgehäuse bis zu dem Gehäusedeckel er streckt. Der Spalttopf bestimmt somit in axialer Richtung, d. h. entlang der Rotationsachse der Motorwelle, einen erheblichen Teil des zentral innen liegenden Motorgehäuses um die Rotationsachse. Vorzugsweise erstreckt sich der Spalttopf in axialer Richtung über 60-95%, weiter bevorzugt über 70- 95%, noch weiter bevorzugt über 80-90% der axialen Gesamterstreckung des Motorgehäuses. Furthermore, in the case of the electric motor, it is provided in a further development that the containment shell extends axially through the motor housing to the housing cover. The containment shell thus determines in the axial direction, i. H. along the axis of rotation of the motor shaft, a significant part of the motor housing located centrally around the axis of rotation. The containment shell preferably extends in the axial direction over 60-95%, more preferably over 70-95%, even more preferably over 80-90% of the total axial extent of the motor housing.
Vorteilhaft ist ferner ein Ausführungsbeispiel, bei dem das Motorgehäuse und der Spalttopf aus Kunststoff gebildet sind und der metallische Kugellagertopf mit dem Kunststoff unmittelbar im Spritzgussverfahren umspritzt ist. Für eine kompakte Bauweise ist bei dem Elektromotor günstigerweise vorge sehen, dass die Wicklungen den Spalttopf in Umfangsrichtung umschließen. Gleichzeitig ist vorteilhaft, dass die Wicklungen axial zu dem Kugellager be- abstandet angeordnet sind. Somit bleibt die Wärmeentwicklung der Motor wicklungen von derjenigen des Kugellagers getrennt. Weiter vorteilhaft für eine kompakte Bauweise des Elektromotors ist, dass die Motorelektronik axial einseitig auf einer Leiterplatte angeordnet ist, die eine zentrale Öffnung aufweist und sich der von dem Gehäusedeckel vorstehen- der Kühlkörper durch die zentrale Öffnung hindurch erstreckt. Alternativ wird vorgesehenen, dass sich der Spalttopf durch die zentrale Öffnung hindurch erstreckt. Also advantageous is an embodiment in which the motor housing and the containment shell are formed from plastic and the metallic ball bearing cup is extrusion-coated directly with the plastic. For a compact design, it is convenient to see in the electric motor that the windings enclose the containment shell in the circumferential direction. At the same time, it is advantageous that the windings are arranged axially spaced from the ball bearing. Thus, the heat development of the motor windings remains separate from that of the ball bearing. Another advantage for a compact design of the electric motor is that the motor electronics are arranged axially on one side on a circuit board which has a central opening and which protrudes from the housing cover. the heat sink extends through the central opening. Alternatively, it is provided that the containment shell extends through the central opening.
Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprü- chen gekennzeichnet bzw. werden nachstehend zusammen mit der Beschreibung der bevorzugten Ausführung der Erfindung anhand der Figuren näher dargestellt. Es zeigen: Other advantageous developments of the invention are characterized in the subclaims or are shown in more detail below together with the description of the preferred embodiment of the invention with reference to the figures. Show it:
Fig. 1 eine seitliche Schnittansicht durch einen Elektromotor eines Fig. 1 is a side sectional view through an electric motor
Ausführungsbeispiels; Fig. 2 eine Detailansicht aus Figur 1. Embodiment; 2 shows a detailed view from FIG. 1.
In den Figuren 1 und 2 ist ein Ausführungsbeispiel eines erfindungsgemäßen Elektromotors 1 in einer seitlichen Schnittansicht bzw. Detailansicht dargestellt. In the figures 1 and 2, an embodiment of an electric motor 1 according to the invention is shown in a side sectional view or detailed view.
Der Elektromotor 1 umfasst das einstückige, aus PPS (Polyphenylensulfid) gebildete Motorgehäuse 2 mit dem Gehäusedeckel 3, der axial auf dem Motorgehäuse 2 befestigbar ist und im befestigten Zustand einen Teil des Motorgehäuses bildet. Auf der axial dem Gehäusedeckel 3 gegenüberliegenden Seite bildet das Motorgehäuse 2 einstückig den sich axial ins Innere des Mo torgehäuses 2 hinein erstreckenden Spalttopf 7 aus. Zwischen der Innen- wandung des Motorgehäuses 2 und dem Außenmantel des Spalttopfes 7 liegt der Motorabschnitt, in dem die Motorwicklungen 6 und die auf der Lei terplatte 14 axial einseitig befestigte Motorelektronik 5 aufgenommen sind. Die Bauteile der Motorelektronik 5 erstrecken sich in Flohlräume des Motorabschnitts in Richtung der Motorwicklungen 6. Über den Spalttopf 7 dichtend abgegrenzt liegt innerhalb des Spalttopfes 7 der mit den von den Arbeitsmaschinen geförderten Medien in Kontakt kommende Wellenabschnitt, in dem die Motorwelle 4 entlang ihrer Rotationsachse verläuft. Der Spalttopf 7 er- streckt sich in axialer Richtung im Wesentlichen durch das gesamte Motorgehäuse 2 bis zu dem Gehäusedeckel 3. Ferner ist am Motorgehäuse 2 die Steckvorrichtung 77 mit Anschlüssen, welche mit der Motorelektronik 5 auf der Leiterplatte 14 verbunden sind, zum Anschluss der kundenspezifischen Stecker integriert. The electric motor 1 comprises the one-piece motor housing 2 formed from PPS (polyphenylene sulfide) with the housing cover 3, which can be fastened axially on the motor housing 2 and forms a part of the motor housing when fastened. On the axially opposite side of the housing cover 3, the motor housing 2 forms in one piece the can 7 extending axially into the interior of the motor housing 2. Between the inner wall of the motor housing 2 and the outer casing of the containment shell 7 is the motor section in which the motor windings 6 and the motor electronics 5 axially fixed on one side to the printed circuit board 14 are accommodated. The components of the motor electronics 5 extend in the hollow spaces of the motor section in the direction of the motor windings 6. The shaft section, delimited in a sealed manner via the containment shell 7, contains the shaft section within the containment shell 7, in which the motor shaft 4 comes into contact, in which the motor shaft 4 runs along its axis of rotation . The can 7 extends in the axial direction essentially through the entire motor housing 2 to the housing cover 3. Furthermore, the plug device 77 with connections, which are connected to the motor electronics 5 on the printed circuit board 14, is integrated on the motor housing 2 for connecting the customer-specific plug.
Im Wellenabschnitt ist im Spalttopf 7 der Innenläufer-Rotor 44 positioniert, dessen Ferrit-Permanentmagnet 55 mit einer seine Innenmantelfläche bestimmenden Kunststoffumspritzung versehen ist, die den Wellendurchgang für die Motorwelle 4 bildet. An der Innenmantelfläche ist die Pressbuchse 22 angeordnet, die sich an einem Axialanschlag (nicht gezeigt) abstützt, um die Motorwelle 4 einpressen zu können. In the shaft section, the inner rotor rotor 44 is positioned in the containment shell 7, the ferrite permanent magnet 55 of which is provided with a plastic encapsulation which defines its inner surface, which forms the shaft passage for the motor shaft 4. The press bushing 22 is arranged on the inner lateral surface and is supported on an axial stop (not shown) in order to be able to press in the motor shaft 4.
Im in axialer Richtung gesehen tiefsten Abschnitt des Spalttopfes 7 ist der aus einem wärmeleitfähigen Material, insbesondere aus Metall gebildete Kugellagertopf 8 angeordnet. Das Motorgehäuse 2 mit dem Spalttopf 7 ist aus Kunststoff im Spritzgussverfahren um den Kugellagertopf 8 gespritzt, so dass der Spalttopf 7 und der Kugellagertopf 8 dieselbe Form bzw. Innen- und Außenkontur aufweisen und unmittelbar aneinander anliegen. Der Kugellager topf 8 bestimmt den Lagersitz für das eingepresste Kugellager 9, in dem die Motorwelle 4 gelagert ist. Zwischen dem Kugellager 9 und der axialen In- nenwandfläche des Spalttopfes 7 ist der Freiraum 13 gebildet, in den sich die Motorwelle 4 mit ihrem freien Ende hinein erstreckt. In the deepest section of the containment shell 7, seen in the axial direction, the ball bearing pot 8, which is formed from a thermally conductive material, in particular from metal, is arranged. The motor housing 2 with the can 7 is injection molded from plastic in an injection molding process around the ball bearing pot 8, so that the can 7 and the ball bearing pot 8 have the same shape or inner and outer contours and abut one another directly. The ball bearing cup 8 determines the bearing seat for the pressed-in ball bearing 9, in which the motor shaft 4 is mounted. Between the ball bearing 9 and the axial inner wall surface of the containment shell 7, the free space 13 is formed, into which the motor shaft 4 extends with its free end.
Um die Rotationsachse ist an dem Gehäusedeckel 3 einstückig ein axial in Richtung des Kugellagertopfes 8 vorstehender Kühlkörper 11 in Form eines aus Vollmaterial gebildeten Zylinders ausgebildet. Axial zwischen dem Kühl- element 11 und der axialen Außenwandfläche des Spalttopfes 7 ist der Spalt 121 mit einem Spaltmaß von maximal 1/20 des Außendurchmessers des Kugellagers. In dem Spalt 121 ist in der gezeigten Ausführung eine Schicht der Wärmeleitpaste 10 vorgesehen, die auch durch Wärmeleitkleber ersetz- bar ist. A cooling body 11 protruding axially in the direction of the ball bearing cup 8 in the form of a cylinder made of solid material is integrally formed on the housing cover 3 around the axis of rotation. Axial between the cooling element 11 and the axial outer wall surface of the can 7 is the gap 121 with a gap dimension of a maximum of 1/20 of the outer diameter of the ball bearing. In the embodiment shown, a gap of the thermal paste 10 is provided in the gap 121, which layer can also be replaced by thermal adhesive is cash.
Die Wärmeableitung der durch das Kugellager 9 im Betrieb erzeugten Wärme erfolgt von dem Kugellager 9 auf den Kugellagertopf 8, weiter an den Spalttopf 7 und in axialer Richtung über die Wärmeleitpaste 10 an den Kühl- körper 11 des Gehäusedeckels 3 des Motorgehäuses 2. Von dem Gehäusedeckel 3 wird die Wärme weiter an die Außenumgebung abgegeben. Das Motorgehäuse und insbesondere sein Gehäusedeckel 3 fungieren mithin als Kühlkörper In einer nicht gezeigten alternativen Ausführung wird auf die Wärmeleitpaste 10 verzichtet und der Kühlkörper 11 kontaktiert unmittelbar den Spalttopf 7. Der Spalt 121 hat dann das Spaltmaß Null. The heat dissipation of the heat generated by the ball bearing 9 during operation takes place from the ball bearing 9 to the ball bearing pot 8, further to the split pot 7 and in the axial direction via the thermal paste 10 to the heat sink 11 of the housing cover 3 of the motor housing 2. From the housing cover 3 the heat is given off to the outside environment. The motor housing and in particular its housing cover 3 thus function as a heat sink. In an alternative embodiment, not shown, the thermal paste 10 is dispensed with and the heat sink 11 makes direct contact with the can 7. The gap 121 then has a gap dimension of zero.
Der Spalttopf 7 ist hohlzylindrisch und in drei axiale Abschnitte mit jeweils unterschiedlichen Innendurchmessern unterteilt. In Bereich des geringsten Durchmessers ist der Freiraum 13, im mittleren Bereich der Lagersitz mit dem Kugellager 9 und im Bereich des größten Innendurchmessers sind radi- al um den Spalttopf 7 die Motorwicklungen 6 angeordnet. Das Kugellager 9 ist somit gegenüber den Motorwicklungen 5 in axialer Richtung gesehen überlappungsfrei. The can 7 is hollow cylindrical and divided into three axial sections, each with different inner diameters. The free space 13 is in the area of the smallest diameter, the bearing seat with the ball bearing 9 in the middle area and the motor windings 6 are arranged radially around the containment shell 7 in the area of the largest inside diameter. The ball bearing 9 is thus seen from the motor windings 5 in the axial direction without overlap.
Die Leiterplatte 14 bestimmt um die Rotationsachse der Motorwelle 4 die zentrale Öffnung 15, durch die sich in axialer Richtung der von dem Gehäu- sedeckel 3 axial vorstehende Kühlkörper 11 hindurch bis zu dem Spalttopf 7 erstreckt. In einer nicht dargestellten, jedoch ebenfalls zur Offenbarung gehörenden alternativen Variante erstreckt sich anstelle des Kühlkörpers 11 der Bereich des geringsten Durchmessers des Spalttopfes 7 durch die Öffnung 15 oder zumindest in die Öffnung 15 hinein, so dass die Kontaktierung zwi- sehen Spalttopf 7 und Kühlkörper 11 auf Höhe der Leiterplatte 14 oder axial oberhalb der Leiterplatte 14 erfolgt. In einer weiter alternativen Ausführung wird vorgesehen, den Gehäusedeckel 3 ohne Kühlkörper 11 auszubilden und den Spalttopf 7 unmittelbar oder über die Wärmeleitpaste 10 oder den Wär- meleitkleber an die axiale Innenwand des Gehäusedeckels 3 zur Anlage zu bringen. The printed circuit board 14 determines the central opening 15 about the axis of rotation of the motor shaft 4, through which the cooling body 11 projecting axially from the housing cover 3 extends in the axial direction to the containment shell 7. In an alternative variant, not shown, but also part of the disclosure, instead of the heat sink 11, the area of the smallest diameter of the can 7 extends through the opening 15 or at least into the opening 15, so that the contact between the can 7 and the heat sink 11 at the level of the circuit board 14 or axially above the circuit board 14. In a further alternative embodiment, it is provided that the housing cover 3 be designed without a heat sink 11 and the containment shell 7 directly or via the thermal paste 10 or the heat sink. to bring the glue adhesive to the axial inner wall of the housing cover 3.
Der Gehäusedeckel 3 bildet eine Vielzahl von über seine zur Außenumgebung weisenden Oberfläche verteilt angeordnete Kühlrippen 111 aus, die sich teilweise mittig, d.h. in axialer Projektion gesehen über den Kugellager topf 8 erstrecken. Hierdurch wird die im Bereich des Kugellagertopfes 8 an fallende Wärme schneller an die Außenumgebung geleitet. The housing cover 3 forms a plurality of cooling fins 111 which are arranged distributed over its surface facing the external environment and which are partly in the center, i.e. Seen in axial projection over the ball bearing pot 8 extend. As a result, the heat falling in the region of the ball bearing pot 8 is conducted more quickly to the outside environment.

Claims

Patentansprüche Claims
1. Elektromotor mit einem Motorgehäuse (2), das einen Wellenabschnitt zur Aufnahme einer Motorwelle (4) und einen Motorabschnitt, in dem eine Motorelektronik (5) und Motorwicklungen (6) angeordnet sind, aufweist, wobei der Wellenabschnitt und der Motorabschnitt durch ei nen in dem Motorgehäuse (2) angeordneten Spalttopf (7) voneinander abgedichtet getrennt sind, wobei im Wellenabschnitt in dem Spalttopf (7) ein Innenläufer-Rotor (44) und axial daran anschließend ein metallischer Kugellagertopf (8) angeordnet sind, wobei in dem Kugellager- topf (8) ein Kugellager (9) zur Lagerung der Motorwelle (4) befestigt ist, und wobei der Innenläufer-Rotor (44) einen Wellendurchgang aufweist, der eine axiale Anschlagfläche bildet, und in dem Wellendurchgang an der Anschlagfläche anliegend eine Pressbuchse (22) ange ordnet ist. 1. Electric motor with a motor housing (2), which has a shaft section for receiving a motor shaft (4) and a motor section in which motor electronics (5) and motor windings (6) are arranged, the shaft section and the motor section by egg nen in the motor housing (2) arranged can (7) are separated from each other in a sealed manner, with an inner rotor rotor (44) in the shaft section in the can (7) and a metallic ball bearing pot (8) axially adjoining it, wherein in the ball bearing pot (8) a ball bearing (9) for mounting the motor shaft (4) is fastened, and wherein the inner rotor rotor (44) has a shaft passage, which forms an axial stop surface, and a press bush (22 ) is arranged.
2. Elektromotor nach Anspruch 1 , dadurch gekennzeichnet, dass der2. Electric motor according to claim 1, characterized in that the
Kugellagertopf (8) mittelbar über den Spalttopf (7) an einem mit der Außenumgebung in Verbindung stehenden Abschnitt des Motorge häuses anliegt, so dass das Motorgehäuse als Kühlkörper fungiert und eine von dem Kugellager (9) im Betrieb erzeugte Wärme über den Kugellagertopf (8) und über den Spalttopf (7) an das Motorgehäuse und die Außenumgebung abgeleitet wird. Ball bearing pot (8) bears indirectly via the containment shell (7) on a section of the motor housing which is connected to the external environment, so that the motor housing acts as a heat sink and heat generated by the ball bearing (9) during operation via the ball bearing pot (8) and is diverted to the motor housing and the external environment via the containment shell (7).
3. Elektromotor nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Spalttopf (7) einstückig durch das Motorgehäuse (2) um einen Rotationsachse der Motorwelle (4) gebildet ist. 3. Electric motor according to claim 1 or 2, characterized in that the containment shell (7) is formed in one piece by the motor housing (2) about an axis of rotation of the motor shaft (4).
4. Elektromotor nach einem der vorigen Ansprüche, dadurch gekennzeichnet, dass der Spalttopf (7) und der Kugellagertopf (8) in dem Abschnitt des Spalttopfes (7), in dem der Kugellagertopf (8) angeordnet ist, formidentisch ausgebildet sind. 4. Electric motor according to one of the preceding claims, characterized in that the split pot (7) and the ball bearing pot (8) in the section of the split pot (7), in which the ball bearing pot (8) is arranged, are of identical shape.
5. Elektromotor nach einem der vorigen Ansprüche, dadurch gekennzeichnet, dass zwischen dem Spalttopf (7) und dem Gehäusedeckel (3) eine Wärmeleitpaste (10) oder ein Wärmeleitkleber vorgesehen ist. 5. Electric motor according to one of the preceding claims, characterized in that a thermal compound (10) or a thermal adhesive is provided between the containment shell (7) and the housing cover (3).
6. Elektromotor nach einem der vorigen Ansprüche, dadurch gekenn- zeichnet, dass das Motorgehäuse (2) einen lösbaren Gehäusedeckel6. Electric motor according to one of the preceding claims, characterized in that the motor housing (2) has a detachable housing cover
(3) aufweist, der auf eine axiale Seite des übrigen Motorgehäuses (2) aufsetzbar ist und den Abschnitt des Motorgehäuses bildet, der mittel bar über den Spalttopf (7) mit dem Kugellagertopf (8) in Verbindung steht. (3), which can be placed on an axial side of the rest of the motor housing (2) and forms the section of the motor housing which is connected via the split pot (7) with the ball bearing pot (8).
7. Elektromotor nach dem vorigen Anspruch, dadurch gekennzeichnet, dass der Gehäusedeckel (3) mindestens ein axial in Richtung der Außenumgebung vorstehendes Kühlelement aufweist, das eine mit der Außenumgebung in Kontakt stehende Abkühloberfläche des Gehäusedeckels (3) lokal vergrößert. 7. Electric motor according to the preceding claim, characterized in that the housing cover (3) has at least one axially projecting cooling element in the direction of the external environment, which locally increases a cooling surface in contact with the external environment of the housing cover (3).
8. Elektromotor nach dem vorigen Anspruch, dadurch gekennzeichnet, dass das mindestens eine Kühlelement als eine Vielzahl von über den Gehäusedeckel (3) verteilt angeordnete Kühlrippen (111) ausgebildet ist und mindestens eine der Kühlrippen (111) in axialer Projektion gesehen den Kugellagertopf (8) überstreckt. 8. Electric motor according to the preceding claim, characterized in that the at least one cooling element is designed as a plurality of cooling fins (111) arranged distributed over the housing cover (3) and at least one of the cooling fins (111) seen in axial projection the ball bearing pot (8 ) overstretched.
9. Elektromotor nach dem vorigen Anspruch, dadurch gekennzeichnet, dass der Gehäusedeckel (3) ein axial in Richtung des Kugellagertopfes (8) vorstehender Kühlkörper (11) aufweist, das mittelbar über den Spalttopf (7) eine Anbindungsfläche an den Kugellagertopf (8) lokal vergrößert. 9. Electric motor according to the preceding claim, characterized in that the housing cover (3) has an axially in the direction of the ball bearing pot (8) protruding heat sink (11) which indirectly via the containment shell (7) has a connection surface to the ball bearing pot (8) locally enlarged.
10. Elektromotor nach dem vorigen Anspruch, dadurch gekennzeichnet, dass der Kühlkörper (11 ) zylindrisch oder konusförmig mit einer axia len Anbindungsfläche an eine axiale Außenwandfläche des Spalttop- fes (7) ausgebildet ist. 10. Electric motor according to the preceding claim, characterized in that the cooling body (11) cylindrical or conical with an axial connection surface to an axial outer wall surface of the split top fes (7) is formed.
11.Elektromotor nach einem der vorigen Ansprüche, dadurch gekennzeichnet, dass der Kugellagertopf (8) einen Kugellagersitz ausbildet, in den das Kugellager (9) eingepresst oder eingeschoben ist. 11. Electric motor according to one of the preceding claims, characterized in that the ball bearing pot (8) forms a ball bearing seat into which the ball bearing (9) is pressed or inserted.
12. Elektromotor nach einem der vorigen Ansprüche, dadurch gekennzeichnet, dass der Kugellagertopf (8) zwischen dem Kugellager (9) und dem mit der Außenumgebung in Verbindung stehenden Abschnitt des Motorgehäuses (2) einen Freiraum (13) aufweist. 12. Electric motor according to one of the preceding claims, characterized in that the ball bearing pot (8) has a free space (13) between the ball bearing (9) and the section of the motor housing (2) which is connected to the external environment.
13. Elektromotor nach einem der vorigen Ansprüche 6-12, dadurch ge- kennzeichnet, dass sich der Spalttopf (7) und der Kugellagertopf (8) axial durch das Motorgehäuse (2) bis zu dem Gehäusedeckel (3) er strecken. 13. Electric motor according to one of the preceding claims 6-12, characterized in that the containment shell (7) and the ball bearing pot (8) extend axially through the motor housing (2) to the housing cover (3).
14. Elektromotor nach einem der vorigen Ansprüche, dadurch gekennzeichnet, dass die Motorwicklungen (6) den Spalttopf (7) in Umfangs- richtung umschließen und axial zu dem Kugellager (9) beabstandet angeordnet sind. 14. Electric motor according to one of the preceding claims, characterized in that the motor windings (6) enclose the containment shell (7) in the circumferential direction and are arranged axially spaced from the ball bearing (9).
15. Elektromotor nach einem der vorigen Ansprüche 6-14, dadurch ge kennzeichnet, dass die Motorelektronik (5) axial einseitig auf einer Leiterplatte (14) angeordnet ist, die eine zentrale Öffnung (15) aufweist, die eine unmittelbare Strömungsverbindung zwischen dem Spalttopf15. Electric motor according to one of the preceding claims 6-14, characterized in that the motor electronics (5) is arranged axially on one side on a printed circuit board (14) which has a central opening (15) which has a direct flow connection between the containment shell
(7) und dem Gehäusedeckel (3) bestimmt, so dass eine von dem Kugellager (9) im Betrieb erzeugte Wärme unmittelbar an den Gehäusedeckel (3) übertragbar ist. (7) and the housing cover (3), so that a heat generated by the ball bearing (9) during operation can be transferred directly to the housing cover (3).
EP19820733.4A 2019-01-30 2019-12-10 Electric motor for driving working machines having media separation Pending EP3871317A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019102368.8A DE102019102368A1 (en) 2019-01-30 2019-01-30 Electric motor for driving work machines with media separation
PCT/EP2019/084501 WO2020156714A1 (en) 2019-01-30 2019-12-10 Electric motor for driving working machines having media separation

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EP3871317A1 true EP3871317A1 (en) 2021-09-01

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EP19820733.4A Pending EP3871317A1 (en) 2019-01-30 2019-12-10 Electric motor for driving working machines having media separation

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US (1) US20220085683A1 (en)
EP (1) EP3871317A1 (en)
KR (1) KR20210117259A (en)
CN (1) CN113302818A (en)
DE (1) DE102019102368A1 (en)
WO (1) WO2020156714A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR102017027366B1 (en) * 2017-12-18 2024-01-09 Insfor - Innovative Solutions For Robotics Ltda - Me OPERATING SYSTEM FOR LAUNCHING, MANAGEMENT AND CONTROL OF ROBOTIZED AUTONOMOUS UNIT (RAU) FOR WORK IN OIL AND GAS WELLS AND WELL PROFILING METHOD WITH THE AID OF SAID SYSTEM

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE942338C (en) * 1953-05-04 1956-05-03 Vogel Pumpen Device for cooling the runner of water-filled underwater motors by means of an internal water cooling circuit
JPH0723981U (en) * 1992-09-18 1995-05-02 三菱マテリアル株式会社 Stepping motor
US8033007B2 (en) * 2007-05-11 2011-10-11 Sntech, Inc. Method of making rotor of brushless motor
TW201212483A (en) * 2010-09-13 2012-03-16 Sunonwealth Electr Mach Ind Co Rotor of a motor
TW201319394A (en) * 2011-11-07 2013-05-16 Assoma Inc Improved structure of corrosion-protection housing of permanent magnet canned pump
WO2016017165A1 (en) * 2014-08-01 2016-02-04 パナソニックＩｐマネジメント株式会社 Motor
CN105449912A (en) * 2015-12-25 2016-03-30 沃德传动（天津）股份有限公司 Reducer and end cover therefor
DE202018105137U1 (en) * 2018-09-07 2018-09-17 Ebm-Papst St. Georgen Gmbh & Co. Kg Electric motor with heat dissipation for the motor shaft bearing

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DE102019102368A1 (en) 2020-07-30
CN113302818A (en) 2021-08-24
WO2020156714A1 (en) 2020-08-06
KR20210117259A (en) 2021-09-28
US20220085683A1 (en) 2022-03-17

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