EP3871317A1 - Moteur électrique pour entraîner des engins de travail à séparation des milieux - Google Patents

Moteur électrique pour entraîner des engins de travail à séparation des milieux

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)
English (en)
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.)
Hengst SE 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/fr
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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Motor Or Generator Frames (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'invention concerne un moteur électrique doté d'un carter de moteur (2) qui présente une partie arbre destinée à recevoir un arbre de moteur (4) et une partie moteur dans laquelle sont montés une électronique moteur (5) et des enroulements du moteur (6), la partie arbre et la partie moteur étant séparées de manière étanche l'une de l'autre par un pot d'entrefer (7) monté dans le carter de moteur (2), un rotor interne et un pot de roulement à billes (8) métallique qui le jouxte étant montés dans la partie arbre dans le pot d'entrefer (7), et un roulement à billes (9) destiné à supporter l'arbre de moteur (4) étant fixé dans le pot de roulement à billes (8).
EP19820733.4A 2019-01-30 2019-12-10 Moteur électrique pour entraîner des engins de travail à séparation des milieux Pending EP3871317A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019102368.8A DE102019102368A1 (de) 2019-01-30 2019-01-30 Elektromotor zum Antrieb von Arbeitsmaschinen mit Medientrennung
PCT/EP2019/084501 WO2020156714A1 (fr) 2019-01-30 2019-12-10 Moteur électrique pour entraîner des engins de travail à séparation des milieux

Publications (1)

Publication Number Publication Date
EP3871317A1 true EP3871317A1 (fr) 2021-09-01

Family

ID=68887039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19820733.4A Pending EP3871317A1 (fr) 2019-01-30 2019-12-10 Moteur électrique pour entraîner des engins de travail à séparation des milieux

Country Status (6)

Country Link
US (1) US20220085683A1 (fr)
EP (1) EP3871317A1 (fr)
KR (1) KR20210117259A (fr)
CN (1) CN113302818A (fr)
DE (1) DE102019102368A1 (fr)
WO (1) WO2020156714A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BR102017027366B1 (pt) * 2017-12-18 2024-01-09 Insfor - Innovative Solutions For Robotics Ltda - Me Sistema operacional de lançamento, gerenciamento e controle de unidade autônoma robotizada (rau) para trabalhos em poços de óleo e gás e método de perfilagem de poços com auxílio do dito sistema

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE942338C (de) * 1953-05-04 1956-05-03 Vogel Pumpen Einrichtung zur Kuehlung des Laeufers von wassergefuellten Unterwassermotoren mittels eines inneren Wasser-Kuehlkreislaufes
JPH0723981U (ja) * 1992-09-18 1995-05-02 三菱マテリアル株式会社 ステッピングモータ
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 (zh) * 2011-11-07 2013-05-16 Assoma Inc 永磁罐裝泵之防蝕外殼結構改良
WO2016017165A1 (fr) * 2014-08-01 2016-02-04 パナソニックＩｐマネジメント株式会社 Moteur
CN105449912A (zh) * 2015-12-25 2016-03-30 沃德传动（天津）股份有限公司 一种减速机及其端盖
DE202018105137U1 (de) * 2018-09-07 2018-09-17 Ebm-Papst St. Georgen Gmbh & Co. Kg Elektromotor mit einer Wärmeableitung für das Motorwellenlager

Also Published As

Publication number Publication date
US20220085683A1 (en) 2022-03-17
KR20210117259A (ko) 2021-09-28
WO2020156714A1 (fr) 2020-08-06
DE102019102368A1 (de) 2020-07-30
CN113302818A (zh) 2021-08-24

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