EP3997781A1 - Machine électrique comprenant des rails conducteurs refroidis - Google Patents

Machine électrique comprenant des rails conducteurs refroidis

Info

Publication number
EP3997781A1
EP3997781A1 EP20729736.7A EP20729736A EP3997781A1 EP 3997781 A1 EP3997781 A1 EP 3997781A1 EP 20729736 A EP20729736 A EP 20729736A EP 3997781 A1 EP3997781 A1 EP 3997781A1
Authority
EP
European Patent Office
Prior art keywords
cooling
electrical machine
stator
busbar
housing
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
EP20729736.7A
Other languages
German (de)
English (en)
Inventor
Konstantin Lindenthal
Uwe Knappenberger
Sebastian Hoffmann
Andreas Herzberger
Claus-Christian Oetting
Thomas Bublat
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3997781A1 publication Critical patent/EP3997781A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • 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
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
    • 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
    • H02K5/15—Mounting arrangements for bearing-shields or end plates
    • 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
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/09—Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations
    • 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

Definitions

  • the present invention relates to an electrical machine.
  • the electrical machine has in particular cooled busbars.
  • Usual electrical machines include a rotor and a stator, the stator having a stator winding in which a magnetic field can be generated in order to drive the rotor.
  • To energize the stator winding there are busbars that heat up during operation due to their electrical resistance. This heat is given off, for example, via heat conducting pads.
  • part of a housing of the electrical machine or the entire housing of the electrical machine is often made of a metallic material, said heat conducting pads taking the heat from the
  • the electrical machine according to the invention enables busbars to be cooled efficiently. Optimized cooling is possible in particular if a housing of the electrical machine is not made from a metallic material and / or from a material that is poorly thermally conductive.
  • the optimized cooling is achieved in that busbars have cooling lugs which dissipate heat directly to a cooling channel, a cooling medium being able to flow in the cooling channel. In this way it can be achieved that a safe and reliable cooling of the busbars takes place.
  • the electrical machine according to the invention has a rotor and a stator.
  • the rotor and stator are at least partially arranged in a machine housing. At least the stator has a stator winding.
  • the rotor can be designed in any way and is set up in particular to interact with the stator. The stator can thus drive the rotor.
  • the electrical machine also has a cooling jacket for cooling the stator.
  • First cooling channels for guiding a cooling medium run through the cooling jacket.
  • the first cooling channels preferably run parallel, in particular in the axial direction with respect to the stator axis.
  • the cooling medium can be a thermally conductive fluid, for example water.
  • the machine housing includes an end shield.
  • the end shield is connected to the cooling jacket.
  • a rotor shaft of the rotor is mounted on the end shield.
  • the end shield has second cooling channels.
  • the first cooling channels and the second cooling channels are coupled in particular for fluid communication, with each second cooling channel fluidly connecting two first, preferably adjacent, cooling channels.
  • the electrical machine can be cooled through the first cooling channels and the second cooling channels, in particular the stator can be cooled through the cooling channels.
  • the first cooling channels and the second cooling channels form a continuous coolant path through the electrical machine.
  • the coolant path is preferably designed in a meandering or serpentine shape.
  • At least one busbar runs on the end shield.
  • the busbar is electrically connected to a stator winding of the stator. This makes it possible, in particular, to energize the stator winding via the busbar.
  • the busbar has a holding section and at least one cooling tab extending from the main section.
  • the cooling vane is arranged in the machine housing in such a way that it engages in a housing recess in the end shield.
  • the housing recess is formed directly adjacent to one of the second cooling channels.
  • busbar results in a large surface area for heat dissipation from the busbar to the cooling medium.
  • the busbar can be effectively cooled via this area.
  • the cross section of the busbar can be reduced. The costs of the electrical machine can thus be reduced compared with electrical machines from the prior art.
  • a reduction in the cross section of the busbar enables a weight saving.
  • the effective cooling of the busbar enables higher electrical currents to flow with the same cross-section of the busbar.
  • heat-conducting pads are not necessary, as a result of which the assembly effort and thus also the assembly costs are reduced.
  • the advantage of effective cooling is achieved in particular in that an existing cooling circuit of the electrical machine is used. This serves to cool the electrical machine, in particular the stator, particularly preferably a winding head of the stator, and is therefore already present in the electrical machine.
  • the cooling jacket is advantageously part of the stator or part of the machine housing.
  • the cooling jacket in one
  • the cooling jacket encloses the stator at least in some areas, in particular completely.
  • the cooling jacket surrounds the stator in particular in the circumferential direction around an axis of rotation of the electrical machine.
  • the stator is advantageously held by the cooling jacket. It is preferably provided that the busbar has two cooling tabs.
  • Each cooling vane is arranged in its own housing recess in the end shield.
  • One of the second cooling channels runs between the two housing recesses, which means that the two
  • Housing recesses are formed on both sides of one of the second cooling channels.
  • the heat-conducting material can in particular be a heat-conducting adhesive. This leads to a further improved heat transfer between the busbar and
  • Cooling medium that flows within the second cooling channels.
  • An electrical insulation material is introduced into the bearing shield.
  • it is an electrically insulating adhesive.
  • the adhesive can particularly advantageously be both electrically insulating and thermally conductive. If the adhesive is electrically insulating, housing parts made of metal can be used, for example, which enable optimal heat conduction, while at the same time the risk of a short circuit via the busbar is minimized. Alternatively or in addition to the adhesive, it can be
  • Insulation material can also be protective varnish and / or an insert.
  • the main area of the busbar is advantageously formed in one piece with the cooling lug of the busbar.
  • the busbar is particularly advantageously manufactured as a stamped and bent part. In this way, the busbar can be produced simply and inexpensively, and in this way the
  • the main area and cooling vane are separate elements.
  • the cooling flag and the main area are via a joining process connected with each other. It is particularly advantageous to be a
  • Busbar can be used. Due to the separate design of the cooling flag and main area and the subsequent joining of the two
  • busbars Components, a design of the busbars can be implemented easily and inexpensively in any way. There is thus increased flexibility in the layout and design of the busbar.
  • the main area and the cooling vane can also be coupled by a force-fit connection.
  • the non-positive connection can be achieved in particular by a press connection.
  • the main area and cooling vane are connected in a form-fitting manner. This can be implemented particularly advantageously via a rivet connection. All of these different types of connection allow a simple and inexpensive connection of the main area and cooling flag, with heat transfer being made possible between the main area and cooling flag. This ensures that the cooling vane
  • Main area and the entire busbar can cool.
  • the stator winding is particularly advantageously a three-phase winding.
  • the cooling jacket and / or the bearing plate are preferably made of a metallic material.
  • the cooling jacket and end shield can also be made from a plastic. If metallic materials are used, thermal conductivity is improved. The formation of the elements from plastic, in turn, enables flexible design and inexpensive manufacture.
  • the cooling jacket is advantageously designed as a hollow cylinder.
  • the first cooling channel is arranged along a central axis of the hollow cylindrical shape, the end shield closing the cooling jacket at one end face.
  • an S-shaped course of the cooling medium through the cooling jacket and the end shield can be achieved in this way.
  • Each cooling vane is particularly preferably designed in such a way that it extends parallel to a central axis of the rotor.
  • Figure 1 is a schematic illustration of an electrical machine according to an embodiment of the invention
  • FIG. 2 shows a schematic detailed view of the electrical machine according to the embodiment of the invention
  • Figure 3 is a schematic sectional view of a bearing plate of the
  • FIG. 4 shows a schematic sectional view of at least a partial area of the electrical machine
  • Figure 5 is a schematic detailed view of a portion of a
  • Figure 1 shows schematically an electrical machine 1 according to a
  • the electrical machine 1 has a Rotor 2 and a stator 3.
  • the rotor 2 comprises a rotor shaft 8 which can be rotated about a central axis 100.
  • the rotor 2 can be driven via the stator 3. It is provided that the stator 3 can be cooled through cooling channels 6, 9.
  • the cooling channels 6, 9 are arranged in a machine housing 4 of the electrical machine 1.
  • the machine housing 4 comprises a cooling jacket 5 and at least one bearing plate 7 for mounting the rotor shaft 8, two bearing plates being shown in FIG.
  • the cooling jacket 5 can also be part of the stator 3.
  • the cooling jacket 5 is designed in the shape of a hollow cylinder and additionally has a plurality of first cooling channels 6, each of which extends parallel to one
  • Fluid can flow within the first cooling channels, in particular in order to cool a stator winding 14 (see FIG. 4).
  • the end shields 7 also have cooling channels, the following second ones
  • Cooling channels 9 are called.
  • the second cooling channels 9 each connect two, for example adjacent, first cooling channels 6 to one another, so that the second cooling channels 9 with the first cooling channels 6 create a coolant path through the electrical machine 1, which is for example meandering or
  • a flow deflector is formed in each of the second cooling channels 9, for example.
  • the rotor shaft 8 is mounted on the end shields 7 via bearings 15. Each end shield 7 is attached to an end face of the hollow cylindrical cooling jacket 5.
  • FIG. 2 shows schematically a course of three busbars 10.
  • Bus bars 10 are electrically connected to the stator winding 14 (see FIG. 4). Thus, by energizing the busbars 10 a
  • the stator winding 14 is energized.
  • the busbars 10 are arranged in particular on the bearing plate 7.
  • FIG. 3 shows a schematic detailed view of the end shield 7. It is shown that the end shield 7 on both sides of the second cooling channels 9
  • Cooling channels 9 and the arrangement of the cooling lugs 12 on both sides of the second cooling channels 9 can create a large area over which one
  • Heat transfer from the busbar 10 to the cooling medium is made possible within the second cooling channel.
  • the bus bar 10 can be cooled effectively. This enables either higher currents to be carried than without such cooling or, alternatively, the design of the busbars 10 with smaller cross-sections.
  • End shield 7 is attached a heat conducting material.
  • it can be a thermally conductive adhesive.
  • FIG. 4 schematically shows a section through at least part of the electrical machine 1.
  • the coupling of one of the first cooling channels 6 to one of the second cooling channels 9 is shown in FIG.
  • the cooling jacket 5 extends around the stator 3.
  • the stator 3 in turn has the stator winding 14, which is electrically contacted by the busbars 10.
  • it is a three-phase stator winding 14, so that each of the busbars 10 is provided for energizing one phase of the stator winding 14.
  • Cooling medium that flows through the first cooling channel 6 and the second cooling channel 9 also automatically reaches that area of the second
  • Cooling channel 9 which is framed by cooling lugs 12.
  • the cooling medium could also flow into the corresponding second cooling channel 9 are guided past the remaining cooling flag 12. In any case, heat can be transferred between the cooling vane 12 and the cooling medium, so that the busbar 10 is cooled.
  • the cooling jacket 5 and the bearing plate 7 can consist of a metallic
  • a metallic material in particular enables better conductivity, with due to the
  • the busbar 10 along one of the second cooling channels 9 enables optimal heat dissipation by means of the coolant.
  • the end shield is made of a metallic material, it is provided that an electrical insulation material is present between the end shield 7 and the busbar 10. In particular, it can be an electrically insulating adhesive and / or a protective lacquer and / or an insert.
  • FIG. 5 schematically shows a partial view of the busbar 10.
  • This has a main section 11 and two cooling lugs 12 connected to it.
  • the cooling tabs 12 and the main section 11 can be designed in one piece, in which case the busbar 10 is advantageously a stamped and bent part, as shown in particular in FIG. Alternatively, the
  • Cooling lugs 12 are separate elements that are connected to the main area 11 by means of a joining process.
  • a method can in particular be a mechanical method such as riveting and / or press-fit connection; alternatively, a thermal method such as soldering and / or
  • the busbars 10 can thus be manufactured and assembled easily and inexpensively. At the same time, the busbars 10 allow safe and reliable heat dissipation via the cooling medium that is passed through the first
  • Cooling channels 6 and the second cooling channels 9 flows.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

La présente invention concerne une machine électrique (1) présentant un rotor (2) et un stator (3), lesquels sont disposés au moins partiellement dans un carter de machine (4), ainsi qu'une enveloppe de refroidissement (5) pour le refroidissement du stator (3), à travers laquelle plusieurs premiers canaux de refroidissement (6) s'étendent parallèles les uns aux autres, en particulier dans la direction axiale par rapport à l'axe de stator, pour le transport d'un agent réfrigérant, le carter de machine (4) présentant au moins un flasque (7) connecté à l'enveloppe de refroidissement (5) pour le logement d'un arbre de rotor (8) du rotor (2), plusieurs deuxièmes canaux de refroidissement (9) étant formés sur le flasque (7), lesquels mettent en communication fluidique respectivement deux premiers canaux de refroidissement (6), en particulier adjacents, les deuxièmes canaux de refroidissement (9) créant avec les premiers canaux de refroidissement (6) un chemin d'agent réfrigérant à travers la machine électrique (1), lequel est réalisé sous forme de méandre ou de serpentin, et au moins un rail conducteur (10) s'étendant sur le flasque (7), lequel est connecté électriquement à en enroulement statorique (14) du stator (3), caractérisé en ce que le rail conducteur (10) présente une section principale (11) et au moins une ailette de refroidissement (12) s'étendant à partir de la section principale (11), l'ailette de refroidissement (12) s'engageant dans un évidement de carter (13) du flasque (7), lequel est réalisé directement adjacent à un des deuxièmes canaux de refroidissement (9).
EP20729736.7A 2019-07-11 2020-05-29 Machine électrique comprenant des rails conducteurs refroidis Pending EP3997781A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019210308.1A DE102019210308A1 (de) 2019-07-11 2019-07-11 Elektrische Maschine mit gekühlten Stromschienen
PCT/EP2020/064997 WO2021004693A1 (fr) 2019-07-11 2020-05-29 Machine électrique comprenant des rails conducteurs refroidis

Publications (1)

Publication Number Publication Date
EP3997781A1 true EP3997781A1 (fr) 2022-05-18

Family

ID=70922064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20729736.7A Pending EP3997781A1 (fr) 2019-07-11 2020-05-29 Machine électrique comprenant des rails conducteurs refroidis

Country Status (5)

Country Link
US (1) US20220271609A1 (fr)
EP (1) EP3997781A1 (fr)
CN (1) CN114041261A (fr)
DE (1) DE102019210308A1 (fr)
WO (1) WO2021004693A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021203801A1 (de) 2021-04-16 2022-10-20 Molabo Gmbh Gekühltes Hochstromsystem
US20240151226A1 (en) * 2021-05-14 2024-05-09 Aisin Corporation Pump device
DE102022213279A1 (de) * 2022-12-08 2024-06-13 Robert Bosch Gesellschaft mit beschränkter Haftung Elektrische Maschine und Kontaktierelement für eine elektrische Maschine

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JP2000197311A (ja) * 1998-12-25 2000-07-14 Toyota Motor Corp 回転電機のコイル冷却構造
EP1401089A1 (fr) 2002-09-18 2004-03-24 Continental ISAD Electronic Systems GmbH & Co. KG Machine électrique comme générateur, stator ou starter-générateur pour un véhicule
WO2011104763A1 (fr) * 2010-02-26 2011-09-01 三菱電機株式会社 Machine rotative
WO2013077264A1 (fr) * 2011-11-22 2013-05-30 本田技研工業株式会社 Machine électrique rotative
DE112013003551T5 (de) * 2012-03-30 2015-04-02 Honda Motor Co., Ltd. Elektrische Umlaufmaschine
WO2014011783A1 (fr) * 2012-07-11 2014-01-16 Remy Technologies, Llc Isolateurs de bobinages interbloquants pour rétention de résine dans un ensemble stator segmenté
CN105264752B (zh) * 2013-05-30 2018-01-26 瑞美技术有限责任公司 具有液体冷却壳体的电机
US10680497B2 (en) * 2014-10-23 2020-06-09 Robert Bosch Gmbh Fluid-cooled housing for an electrical machine
JP6058062B2 (ja) * 2015-04-16 2017-01-11 三菱電機株式会社 回転電機
DE102015209543A1 (de) * 2015-05-22 2016-11-24 Lenze Drives Gmbh Motorsystem
DE102016104858A1 (de) * 2016-03-16 2017-09-21 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Elektrische Maschine
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KR102359705B1 (ko) * 2016-07-20 2022-02-08 엘지마그나 이파워트레인 주식회사 전동기용 케이스
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JP2019054632A (ja) * 2017-09-14 2019-04-04 株式会社東芝 回転電機
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Also Published As

Publication number Publication date
CN114041261A (zh) 2022-02-11
DE102019210308A1 (de) 2021-01-14
US20220271609A1 (en) 2022-08-25
WO2021004693A1 (fr) 2021-01-14

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