EP3949087A1 - Electrical machine, and drive device for a motor vehicle - Google Patents
Electrical machine, and drive device for a motor vehicleInfo
- Publication number
- EP3949087A1 EP3949087A1 EP20716439.3A EP20716439A EP3949087A1 EP 3949087 A1 EP3949087 A1 EP 3949087A1 EP 20716439 A EP20716439 A EP 20716439A EP 3949087 A1 EP3949087 A1 EP 3949087A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connection
- electrical machine
- connection piece
- machine according
- piece
- 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
Links
- 238000004804 winding Methods 0.000 claims abstract description 26
- 239000004020 conductor Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 238000010079 rubber tapping Methods 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims 1
- 229910000881 Cu alloy Inorganic materials 0.000 claims 1
- 239000012809 cooling fluid Substances 0.000 description 9
- 238000001816 cooling Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000003466 welding Methods 0.000 description 4
- 239000000565 sealant Substances 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
-
- 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
- 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
- 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
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
-
- 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
Definitions
- the present invention relates to an electrical machine, in particular an electric motor, according to the preamble of claim 1, and a drive device with an electrical machine, in particular an electric motor, preferably for a motor vehicle, according to the preamble of claim 13.
- connection means for example, from US2014062234 A1.
- a connection means is described here, in which the connection phases of the converter and connection phases of the motor winding are each screwed to conductive current bolts via cable lugs.
- the disadvantage is the high installation effort, since the connection is made via double screwing for each phase.
- this object is achieved by an electrical machine with the characterizing features of claim 1. Because a first connector is connected to a respective phase connection bar or star point connection bar by means of a material connection, in particular a welded connection, and a threaded hole in the first connection piece and a hole in a second connection piece have a common geometric axis, a screw through the hole in the second connection piece in the threaded hole of the first connection piece is screwed in, the assembly can be significantly simplified, since only one screw is required for the electrical connection of the power source, in particular the converter, and the phase connection bar or star point connection bar and the fixing of the connection means.
- connection piece and / or the phase connection bar and / or the star point connection bar is preferably designed as a solid conductor, for example as a copper rod.
- an electrically conductive sleeve is provided between the first connection piece and the second connection piece, the sleeve being in electrical connection with both the first connection piece and the second connection piece.
- the sleeve can be the actual conductor and also a spacer between the two connection pieces. It is therefore even possible to use a non-conductive screw.
- First and second connection pieces can be braced against one another via the sleeve.
- the second connection piece comprises a rigid electrical conductor (busbar) in which the (open or closed) bore is made.
- a rigid electrical conductor is fundamentally advisable, since a correspondingly oriented hole can be made here.
- a flexible conductor possibly with a cable lug, can also be used.
- connection means is provided for the connection means, the connection means being received at least in sections in the connection body.
- the insulating connection body is particularly suitable as a guide and seal for the connection means.
- the connection means can be passed through from a space exposed to cooling fluid in relation to a space not exposed to cooling fluid.
- connection means can be guided and stabilized accordingly.
- the first connection piece has an angular cross section, with a receptacle in the connection body for the first connection piece being angular.
- screwing moments for example, can be conducted in a form-fitting manner from the first connection means to the connection body and material connections of the first connection element can be protected from the application of force.
- the electrical machine is equipped with four connection means, which are received at least in sections in the connection body. As a rule, three phases and a star point must be connected, so that it makes sense to accommodate the connection means in a compact connection body.
- the screw is equipped with a sealing means, in particular an O-ring.
- the sealing means can serve to further improve the sealing of a space acted upon by cooling fluid from a space not acted upon by cooling fluid.
- the sleeve is equipped with a sealing means, in particular an O-ring.
- the sealing means can serve to further improve the sealing of a space acted upon by cooling fluid from a space not acted upon by cooling fluid.
- the threaded hole is provided as a prefabricated threaded hole or as a threaded hole produced when screwing with a self-tapping screw, in particular without cutting, self-tapping screw.
- One production step can be saved with a chipless self-tapping screw.
- the screw can be designed to be self-locking, for example by means of a variable thread pitch. This eliminates the need for a separate screw lock.
- connection piece is selected from a material that is advantageous for the application, in particular copper or aluminum.
- aluminum can be used particularly advantageously for non-cutting screw connections.
- Another object of the present invention is to provide an improved compact drive device with an electric machine.
- this object is achieved by a drive device with the characterizing features of claim 13. Because an electrical machine according to at least one of the preceding claims is used in the drive device, the advantages outlined above can be used for the drive device.
- the electrical machine and a converter are accommodated in a housing. This results in a compact design. Further components can be accommodated in the housing, such as gearboxes, output shafts, etc.
- the housing has a converter compartment and a motor compartment, the converter being accommodated in the converter compartment, the electrical machine being accommodated in the motor compartment, the first connector being arranged in the motor compartment and the second connection piece is arranged in the converter space, wherein the connection body is arranged in a sealing manner between the motor space and the converter space.
- the motor compartment and in particular the end winding or the first connection pieces can be flushed with cooling fluid, the converter space and in particular the second connection pieces being sealed off from the cooling fluid.
- FIG. 1 shows a drive device according to the invention in a perspective view
- FIG. 2 shows a drive device according to the invention in a perspective view
- FIG. 4 shows a drive device according to the invention in a perspective view
- FIG. 7 shows a detailed illustration of a drive device according to the invention according to
- FIG. 8 shows a detailed illustration of a drive device according to the invention according to
- a drive device essentially comprises an electric machine 1, in particular an electric motor comprising a rotor R and a stator S, a gear 2 and a converter IN.
- the aforementioned components are accommodated in a common housing G and accordingly form a compact drive device.
- the housing G is preferably divided into two parts and has a converter compartment Gl and a motor compartment G2.
- the housing is closed by a cover 4 on the converter side.
- a bearing plate LD is attached to both sides of the engine compartment G2.
- a bearing shield at least partially encloses the transmission 2.
- the gear 2 is designed as a reduction gear with an integrated differential and has two output (half) shafts 21a, b, which are led out of the housing G.
- the drive device should preferably be used as a compact drive device for a motor vehicle.
- the electric machine is preferably an electric motor.
- the electric machine is an electric generator or the electric motor is used as a generator.
- the term electric motor is used synonymously for electric machine.
- the electric motor 1 essentially comprises a stator S and in particular a rotor R, the rotor R being mounted so as to be rotatable about a common longitudinal axis L with respect to the stator S.
- the stator S comprises a built-up winding which is assembled from bar conductors 12 drawn into slots in the stator lamination stack and interconnection webs 111 electrically connecting the bar conductor ends.
- the interconnection webs 111 essentially form the end winding 11.
- the interconnection webs 111 essentially connect rod conductors 12 of the stator S according to a predetermined pattern.
- the winding is preferably a three-phase winding.
- phase connections of phases U, V, W are led out of the electric motor in the form of three phase connection webs 112 to 112b. Furthermore, a star point of the winding is led out of the electric motor via a star point connection web 112c.
- the three phases U, V, W are electrically connected at one end of the winding via a star point connector web 113.
- connection means 13 to 13c and an electrical conductor 14 to 14c are provided.
- the electrical conductor 14, 14a-c can be a rigid conductor track, preferably made of solid copper, which is permanently installed in the housing.
- a suitable flexible cable is of course also conceivable.
- connection means 13, 13a-c essentially comprises a first connection piece 131, 131 a-c, a second connection piece 132, 132 a-c and a screw 133, 133 a-c with a screw head 1331.
- the first connection piece 131, 131 a-c is connected to the respective phase connection web 112 or 112a or 112b or star point connection web 112c. Furthermore, the first connection piece 131, 131 a-c has a threaded bore 1311 for screwing in the threaded section of the screw 133, 133 a-c.
- the threaded hole 1311 is provided in the exemplary embodiment as a hole with a prefabricated thread. Alternatively, a threaded hole designed as a drilled hole would be possible, into which the thread is impressed during the assembly process by a self-tapping screw.
- the second connection piece 132, 132 a-c comprises a bore 1321.
- the bore 1321 is provided in the electrical conductor 14.
- the bore 1321 can be an open or closed recess.
- the first connection piece 131, 131 ac is connected to the respective phase connection web 112 or 112a or 112b or star point connection web 112c by means of a material connection, in particular a welded connection, and the threaded bore 1311 of the first connection piece 131, 131 ac and the bore 1321 of the second connection piece 132, 132 ac have a common geometric axis X.
- a material connection is preferably established by means of welding. However, soldering, gluing or other material connections are also conceivable.
- the connecting means 13, 13a-c can further comprise a sleeve 134, 134 ac.
- the second connection piece 132, 132 ac is preferably arranged between the screw head 1331 and the sleeve 134.
- the sleeve 134 is preferably arranged between the second connection piece 132, 132 ac and the first connection piece 131, 131 ac.
- the screw 133, 133 a-c has, viewed in sequence from the screw head 1331, a non-threaded section 1332 and a threaded section 1333.
- the non-threaded section 1332 is preferably arranged, at least in sections, in the sleeve 134.
- the non-threaded section 1332 is preferably equipped with a sealing means 1334, in particular an O-ring seal.
- the screw 133, 133 a-c is preferably an expansion screw.
- connection terminal comprises an insulating connection body 15.
- the insulating connection body 15 can have bushings 153 and / or receiving means 154 for the connection elements and / or contact surfaces 155 for the end winding contour and / or connection means 156 for connection to the housing G.
- connection body 15 can be divided into two parts and the aforementioned functions can be divided among the components.
- the connection body 15 can thus comprise a first partial body 151 and a second partial body 152.
- the connection bodies 151, 152 can be preassembled independently of one another, so that the comparatively dirt-intensive assembly process of the electric motor and the highly clean assembly process of the drive converter can in fact be carried out separately from one another.
- the first partial body 151 facing the winding head 11 can comprise the passages 153 for the connection pieces 131, 131 ac and a contact surface 155 adapted to the contour of the winding head.
- the contact surface 155 can be designed, for example, as a curved contact surface, in particular since the end winding 11 is mostly designed as a substantially circular cylinder.
- the feedthroughs 153 are preferably adapted to the preferably angular cross section or the angular outer contour of the first connection pieces 131, 131 ac and form one in the direction of rotation of the screw connection form-fitting system for absorbing screwing forces and moments. The electrically conductive welding of the first connection pieces 131, 131 ac to the connection webs 112 is thereby protected from damaging forces.
- the second partial body 152 which faces away from the winding head relative to the first partial body 151, can comprise receiving means 154 for the connecting pieces 132 or 134 as well as connecting means 156 for connection to the housing G.
- the connecting means 156 can include, for example, fastening bores for screws through which screws can be inserted and screwed into the housing G.
- the rotationally symmetrical sleeves 134, 134 a-c are preferably received directly in the connection body 15, in particular the upper connection body 152, the connection body 15 preferably sealingly separating the converter space Gl and the motor space G2 from one another.
- the connection body 15 preferably has a circumferential sealing ring 157.
- the sleeve 134 preferably has the sealing element 1341, e.g. B. O-ring, opposite the connection body 15.
- the screw 133, 133 a-c of the screw connection preferably has the sealing element 1334, in particular an O-ring, opposite the sleeve 134.
- a further sealing element in the form of a metallic or non-metallic sealing washer can be attached to the top and bottom of the sleeve 134.
- the interconnection webs 111 are preferably combined in the winding head 11 to form an interconnection ring in which the individual interconnection webs 111 and the connection webs 112 are arranged in multilayered stacked insulating disks 110, the phase connection web 112, 112 from or the star point connection web 112c, preferably radially out of the interconnection ring or an insulating disk is led out.
- a first connection piece 131, 131 ac is in each case connected, in particular welded, to an associated phase connection web 112, 112 ab or star point connection web 112c.
- the first connection piece 131, 131 ac preferably has a welding gap 1312 in which the respective phase connection web 112, 112 ab or star point connection web 112c is received and fixed.
- the first connection piece 131, 131 ac and the respective phase connection web 112, 112 ab or star point connection web 112c can also be designed in one piece / integral. Then there is no need to attach a separate connection piece 131, 131 ac.
- connection ring is assembled for assembly.
- a connection ring is an end winding 11 assembled from connection webs 111.
- the end winding 11 or the connection ring is oil-cooled.
- the phase connection webs 112, 112 a-b or the star point connection web 112c protrude from it like fingers.
- connection pieces 131, 131 a-c are accommodated in the insulating connection body 15 (placed from above), in particular the first partial body 151.
- the connection body 151 fixes in particular the connection pieces 131, 131 a-c and absorbs forces acting on the connection means 13, 13a-c during the screwing process and thus protects the phase connection web 112, 112 a-b or star point connection web 112c from damage.
- the first part body 151 is preassembled on the connection ring.
- the essentially finished stator S is pushed laterally into the cooling housing 3 that receives it, the cooling housing 3 preferably having a bulge for receiving the first part-body 151, so that the connection body 151 is held on the circumference / three sides by the cooling housing 3.
- the cooling housing 3 is pushed axially into the housing G and fastened with ears.
- the housing G has an opening.
- the second partial body 152 with the sleeves 134 already inserted is or is screwed onto the housing G via the connecting means 156 in a fluid-tight manner. After insertion, the phase outlets and the star point of the converter are screwed to the connection means 13.
- connection means 13, 13a-c is already pre-positioned over the connection body 15 so that a fully automatic screw connection is also possible.
- the screw 133, 133 a-c is preferably an expansion screw.
- the screw 133, 133 ac can be electrically non-conductive.
- the current is preferably transmitted via the respective sleeve 134.
- the housing G can then be closed by a cover 4 and bearing plates LD can be flanged on both sides (after the gear unit 2 has been installed).
- the converter space Gl is separated from the engine compartment G2 in a fluid-tight manner by the connection body 15.
- the motor-side connection means 13, 13a-c, in particular the screws 133, 133 ac or their screw heads 1331, can thereby be acted upon directly with a cooling fluid.
- this has the advantage that the heat input from the motor winding into the thermally more sensitive converter is lower.
- four connections are shown, three connections representing the phases of the 3-phase motor and the fourth connection being the lead-out of the star point.
- connection body 15 is designed such that the second connection pieces 132, 132a, 132b for the assigned phase connection webs 112, 112 a-b branch off in one direction and the second connection piece 132c for the star point connection web 112c branch off in another direction.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019204796.3A DE102019204796A1 (en) | 2019-04-04 | 2019-04-04 | Electric machine and drive device for a motor vehicle |
PCT/EP2020/059083 WO2020201264A1 (en) | 2019-04-04 | 2020-03-31 | Electrical machine, and drive device for a motor vehicle |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3949087A1 true EP3949087A1 (en) | 2022-02-09 |
Family
ID=70154400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20716439.3A Pending EP3949087A1 (en) | 2019-04-04 | 2020-03-31 | Electrical machine, and drive device for a motor vehicle |
Country Status (5)
Country | Link |
---|---|
US (1) | US20220209607A1 (en) |
EP (1) | EP3949087A1 (en) |
CN (1) | CN113597730A (en) |
DE (1) | DE102019204796A1 (en) |
WO (1) | WO2020201264A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102019203525A1 (en) * | 2019-03-15 | 2020-09-17 | Brose Fahrzeugteile SE & Co. Kommanditgesellschaft, Würzburg | Drive device with a brushless electric motor |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1478951A (en) * | 1975-04-17 | 1977-07-06 | Richards Fasteners Ltd C | Self-locking screw threads |
US4362351A (en) * | 1981-02-06 | 1982-12-07 | Towmotor Corporation | Terminal assembly |
DE4411784C2 (en) * | 1994-04-06 | 1998-06-18 | Pfisterer Elektrotech Karl | Connection system for connecting insulated cables to electrical devices |
DE10239935A1 (en) * | 2002-08-30 | 2004-03-11 | Daimlerchrysler Ag | Manufacturing system for end connections for windings for stator of asynchronous electrical machine, produces winding coil with ends of wires exposed on outside and connected to terminal blocks |
JP3692108B2 (en) * | 2002-10-01 | 2005-09-07 | 三菱電機株式会社 | Motor device for electric power steering |
JP2008219972A (en) * | 2007-02-28 | 2008-09-18 | Jtekt Corp | Electric motor |
JP5248814B2 (en) * | 2007-07-18 | 2013-07-31 | 日立オートモティブシステムズ株式会社 | Motor drive device and inspection method thereof |
JP5250297B2 (en) * | 2008-04-17 | 2013-07-31 | 日立オートモティブシステムズ株式会社 | Power converter |
JP5383340B2 (en) * | 2009-06-18 | 2014-01-08 | アイシン精機株式会社 | Wiring structure and wiring method of electric motor |
JP2014050258A (en) | 2012-08-31 | 2014-03-17 | Honda Motor Co Ltd | Rotary electric machine |
GB2509799B (en) * | 2013-06-26 | 2015-10-07 | Protean Electric Ltd | An electric motor or generator |
DE102014201191A1 (en) * | 2014-01-23 | 2015-07-23 | Zf Friedrichshafen Ag | Power connection unit for an electrical machine |
CN107210640B (en) * | 2015-01-22 | 2019-07-19 | 株式会社捷太格特 | Vehicle drive unit |
CN204597672U (en) * | 2015-05-08 | 2015-08-26 | 国家电网公司 | A kind of electric power system is incorporated into the power networks jockey |
DE102016101963A1 (en) * | 2016-02-04 | 2017-08-10 | Bühler Motor GmbH | Electric motor for a fluid pump, modular motor family for forming different fluid pumps with several such electric motors and manufacturing processes |
DE102018210157A1 (en) * | 2018-06-22 | 2019-12-24 | Zf Friedrichshafen Ag | Electrical machine with a power connection |
-
2019
- 2019-04-04 DE DE102019204796.3A patent/DE102019204796A1/en active Pending
-
2020
- 2020-03-31 EP EP20716439.3A patent/EP3949087A1/en active Pending
- 2020-03-31 US US17/601,408 patent/US20220209607A1/en active Pending
- 2020-03-31 WO PCT/EP2020/059083 patent/WO2020201264A1/en unknown
- 2020-03-31 CN CN202080021942.1A patent/CN113597730A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
DE102019204796A1 (en) | 2020-10-08 |
US20220209607A1 (en) | 2022-06-30 |
CN113597730A (en) | 2021-11-02 |
WO2020201264A1 (en) | 2020-10-08 |
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