WO2023088643A1 - Noyau feuilleté pour stator d'une machine d'entraînement électrique - Google Patents

Noyau feuilleté pour stator d'une machine d'entraînement électrique Download PDF

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Publication number
WO2023088643A1
WO2023088643A1 PCT/EP2022/079681 EP2022079681W WO2023088643A1 WO 2023088643 A1 WO2023088643 A1 WO 2023088643A1 EP 2022079681 W EP2022079681 W EP 2022079681W WO 2023088643 A1 WO2023088643 A1 WO 2023088643A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
sealing layer
housing
laminations
recesses
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.)
Ceased
Application number
PCT/EP2022/079681
Other languages
German (de)
English (en)
Inventor
Christoph Seidenberger
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.)
Bayerische Motoren Werke AG
Original Assignee
Bayerische Motoren Werke AG
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 Bayerische Motoren Werke AG filed Critical Bayerische Motoren Werke AG
Priority to CN202280062509.1A priority Critical patent/CN118020229A/zh
Publication of WO2023088643A1 publication Critical patent/WO2023088643A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines
    • 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

Definitions

  • the invention relates to a laminated stator core for a stator of an electric drive machine of a motor vehicle, an electric drive machine and a method for assembling a stator of an electric drive machine of a motor vehicle.
  • Effective cooling of the stator and rotor in electric drive machines is one of the main requirements for high continuous torque and high continuous power, especially in current-excited synchronous machines (SSM).
  • SSM current-excited synchronous machines
  • the invention can also be of interest for asynchronous machines, permanently excited synchronous machines and other electrical machines that also require a high cooling capacity.
  • a high continuous output is essential for dynamic driving behavior, i.e. dynamic driving on country roads or dynamic mountain driving.
  • the rotor of the electric drive machine is cooled with oil, in particular from the inside by hollow shaft cooling and on the end face by end face cooling, while the stator is cooled by water jacket cooling.
  • Oil cooling for the stator core is also known per se. This cooling can be created via different solution paths, with one of these solutions a water jacket or another cooling medium is arranged radially around the stator.
  • This jacket is created using state-of-the-art housing manufacturing processes such as lost foam or permanent mold casting.
  • Another alternative is a two-part die-cast solution. The jacket usually causes high additional costs and a high additional weight.
  • the stator typically has a stator core with a laminated stator core that has a multiplicity of adjacent stator laminations that are identical in design and are adjacent along a longitudinal axis of the electric drive machine.
  • a laminated stator core and a method for cooling the laminated core are known from EP 3 157 138 A1.
  • the laminated core consists of metal sheets.
  • the laminations have recesses, the recesses forming channels for a cooling medium after the laminations have been joined to form the laminated core.
  • Characteristic of the channels is that in a yoke area of the laminated core, inlet channels and return channels are formed from the recesses, that further channels run parallel to the inlet and return channels and that the further channels are localized in the area of the teeth of the laminated core.
  • a laminated stator core for a stator, in particular for a stator core, of an electric drive machine of a motor vehicle has at least: (a) an outer casing of the stator, which has a plurality of recesses, in particular grooves, spaced apart from one another for receiving a coolant; and (b) a jacket sealing layer which is designed to prevent coolant from entering the stator outer jacket, in particular from the recesses ments and / or arranged in between, non-recessed areas radially inward in a radial extension of the stator core and / or through a radial extension of the stator core through to prevent.
  • a cooling jacket with a liquid coolant is not - as in known solutions - implemented by means of an additional or cast-on component (e.g. stator carrier), but directly via the stator. Due to the omission of the stator carrier, there is no heat transfer between the stator and the stator carrier and the costs for the additional component and its weight are also eliminated.
  • an additional or cast-on component e.g. stator carrier
  • the jacket sealing layer is designed to seal an environment against a water-based and/or oil-based coolant in a watertight manner.
  • liquid cooling can also be achieved directly in the stator for dry-running drive machines, in which case the arrangement of the cooling channels (i.e. correspondingly stacked recesses in the individual stator laminations) also allows simple coolant supply from the housing jacket.
  • an electric drive machine for a motor vehicle having a stator with a stator lamination stack according to one embodiment of the invention and a machine housing with a housing cover and a housing pot, which has a housing inner shell on which the stator outer shell of the stator is arranged, in particular pressed in, is.
  • the electric drive machine in particular the machine housing, has a housing base seal for sealing the recesses in the stator outer casing against the housing base, and a housing cover seal for sealing the recesses in the stator outer casing against the housing cover.
  • a method for assembling a stator and/or for assembling the stator in a machine housing of an electrical machine of a motor vehicle having at least the method steps specified below, which do not necessarily have to be carried out in the specified order: (i) Insertion of recesses in an outer contour of at least a part of the stator laminations; (ii) arranging a multiplicity of stator laminations relative to one another on their side surfaces to form a stator lamination stack; (iii) Attaching a jacket sealing layer to the stator laminations and/or the stator core, in particular to the stator outer jacket.
  • liquid cooling can also be achieved directly in the stator for dry-running drive machines, in which case the arrangement of the cooling channels (i.e. correspondingly stacked recesses in the individual stator laminations) also allows simple coolant supply from the housing jacket.
  • the invention is based, among other things, on the idea of designing the jacket cooling via a coated stator directly in the housing, with the cooling ducts of the cooling jacket being formed between the outer contour of the outer stator jacket and an inner contour of an inner housing jacket, so that the recesses of the adjacently arranged stator laminations of the stator lamination stack Form coolant channel cross sections.
  • the laminated core of the stator can be produced, for example, using a progressive composite process (which is known per se).
  • the outer geometry of the stator i.e. the outer casing of the stator, which later takes over the coolant supply in the cooling jacket, is then designed with the help of the progressive tool in such a way that an efficient cooling geometry results.
  • recesses eg, U-shaped or V-shaped or right-angled
  • different laminations with (in particular two) different outside diameters can be machined, so that the recesses are formed by arranging radially larger and smaller laminations and the assembled laminated core of stator has cooling channels running in the circumferential direction.
  • the laminated core of the stator is placed one on top of the other, sheet by sheet, and this creates a 3D geometry on the outer diameter of the stator due to the recesses, which increases the area and thus the cooling efficiency.
  • this stator is then firmly glued, stamped or welded, for example by means of a laser, for example using a baking process.
  • this stator is masked, for example, so that in the subsequent process in this version only the outer geometry and the top sheet have to be coated in order to achieve sufficient coolant sealing.
  • This coating can be applied either by powder or paint using different methods. The paint must be coolant-tight and have sufficient thermal conductivity.
  • stator - i.e. the wound stator lamination stack - is then inserted into the machine housing of the drive machine and sealed with a seal on the A and B bearing sides.
  • the stator is bolted to the B end shield (i.e. the housing cover) and braced.
  • the stator has a lock for torque support on the A and B bearing sides.
  • the casing sealing layer has a circumferential sealing layer in the recesses, in particular on the groove walls and groove base, and/or in the non-recessed areas, particularly on the entire stator outer casing (including groove walls and groove base), which is located in the circumferential and extends in the axial direction of the stator.
  • This type of seal can be applied easily, for example by painting the laminated stator core that has already been installed.
  • the sealing layer between adjacent pairs of stator laminations has a radial sealing layer that extends in the radial direction and in the circumferential direction of the stator.
  • the radial sealing layer is formed by means of a baking lacquer, applied in particular before the machining of the stator geometry, which is set up to form a sealing layer between adjacent laminations when the stator lamination stack is heated, in particular to a predetermined baking temperature.
  • the spaced-apart recesses are formed by alternately arranging one or more stator laminations with a maximum diameter of the stator casing and one or more stator laminations with a cut-out diameter of the stator casing with respect to an axial extent of the stator, so that in particular in this way they are axially spaced from one another Recesses, in particular circumferential cooling channels, are formed on the outer casing of the stator.
  • jacket cooling can be formed in the simplest possible way, which has a plurality of cooling ducts, each of which runs in the circumferential direction and is axially spaced from one another, for example by means of stator laminations with the jacket diameter, which may have one or more recesses at certain points to the connection leading to the coolant, in order to avoid neighboring to connect cooling channels.
  • the casing sealing layer is applied to the stator outer casing with a circumferential sealing layer after the stator laminations have been arranged.
  • the cladding sealing layer is applied with a radial sealing layer to the surface sides of the stator laminations.
  • the method also has the following steps: (I) inserting the stator windings, (II) pushing the stator into a housing pot of a machine housing up to a stop with a housing base seal, placing and fixing, in particular screwing, a housing cover the housing pot in such a way that when it is placed and/or fixed, a fluid-tight seal is formed on both sides axially of the recesses in the outer stator casing on the one hand and the remaining interior of the housing, i.e. a machine interior, on the other hand, in particular by a bracing force applied when fixing, in particular screwing.
  • a simple seal and thus a liquid-cooled, dry-running drive machine in the stator can thus be produced.
  • FIG. 1 shows a schematic of an electrical machine with a laminated stator core according to an exemplary embodiment of the invention after the stator has been installed in a stator housing.
  • FIG. 2 schematically shows an electrical machine with a laminated stator core according to an exemplary embodiment of the invention before the stator is installed in the stator housing.
  • FIGS 1 and 2 show schematically an electrical machine 1 with a stator core 2 with a large number of stator cores 3 according to an exemplary embodiment of the invention before the assembly of the stator (only the stator core 2 is shown in a machine housing 4, which has a housing pot 6 and a Housing cover 8 has.
  • FIG. 1 shows the electrical machine 1 fully assembled, in FIG. 2 before the stator is pushed into the housing pot 6 and before the housing cover 8 is mounted.
  • the thick arrows in FIG. 2 roughly show the directions of the assembly movements.
  • the exemplary embodiment relates to a cost-effective and very efficient jacket cooling for electric jacket cooling.
  • electric drive units for electrically driven motor vehicles, for example electric or hybrid vehicles.
  • Such electrical drive units usually have an electrical machine 1 with a stator 2 and a rotor (not shown) which is rotatably mounted with respect to the stator and which in turn is non-rotatably connected to a rotor shaft (not shown) of the electrical machine 1 .
  • the rotor shaft can be coupled to a transmission of the motor vehicle for torque transmission and is guided through the recess 10 in the housing pot 6 in the exemplary embodiment.
  • the electric machine 1 can be arranged in the machine housing 4 with the transmission (not shown) and with power electronics (not shown).
  • This machine 1 generally has to be cooled because of the continuous power required. In the exemplary embodiment, this takes place by means of a cooling jacket 12 which has a coolant inlet 14 , several cooling channels 16 and a coolant outlet 18 in the housing pot 6 .
  • the cooling jacket 12 is formed directly with the machine housing 4 without a separate jacket component by means of the laminated stator core 2 .
  • the laminated core 2 of the stator is produced by means of a progressive stamping system, through which the outer geometry of the laminated core 2 of the stator is introduced with recesses 15 .
  • the recesses 15 form the cross sections for the cooling channels 16, which take over the water flow in the cooling jacket 12 and are designed in such a way that an efficient cooling geometry results.
  • the recesses 15 are formed by alternately arranging several stator laminations 3a with a maximum diameter of the stator casing and several stator laminations 3b with a recess diameter of the stator casing with respect to an axial extent of the stator, so that in this way axially spaced-apart recesses 15 as circumferential cooling channels 16 on the Stator outer shell 13 are formed.
  • This cooling jacket geometry is created by stacking the laminated stator core 2 sheet by sheet, with several sheets 3a followed by several sheets 3b being placed alternately.
  • the stacked stator laminations 3a, 3b are coated on their sides with a baking varnish 20 and, after being stacked, are firmly connected by means of a baking process in which the baking varnish develops an adhesive effect due to the high temperature.
  • the laminated core 2 of the stator is thus made up of the individual laminations 3a and 3b.
  • the laminated core 2 of the stator is then masked with a sealing layer 22, with only the outer geometry (ie the outer casing of the laminated core of the stator) and the two axial outer sheets being coated. This masking can be applied, for example, by powder or paint using different methods, methods that are known per se.
  • the jacket sealing layer 22 must be coolant-tight and thermally conductive in order on the one hand to keep the coolant away from the machine interior 9 beyond the cooling ducts 16, but on the other hand to enable good heat transfer from the stator laminations into the coolant in the cooling ducts 16.
  • the windings (not shown) are then introduced into the stator lamination stack 2, and the stator formed as a result is pressed into the machine housing 4, so that a fixed connection is formed between the housing inner casing 7 and the stator outer casing 13 (on the laminations 3a with the maximum diameter of the stator casing). and the cooling channels 16 are also delimited towards the machine housing 4 .
  • the coolant flow is delimited or sealed axially by means of seals on the A and B bearing sides, ie by means of a housing base seal 24 and a housing cover seal 26.
  • the stator is screwed to the B end shield and braced.
  • stator can have a lock for torque support on the A and B bearing sides.
  • the jacket sealing layer can be designed in the described or other exemplary embodiments in such a way that, as the jacket sealing layer 22, a masking applied over the outer jacket as a peripheral sealing layer or a layer of baked lacquer arranged between the stator laminations in each case seals (particularly radially) the machine interior 9 against coolant ( in particular together with the axial seals 24 and 26).

Landscapes

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

Abstract

L'invention concerne un noyau feuilleté pour un stator d'une machine d'entraînement électrique d'un véhicule automobile, comprenant une enveloppe de stator externe, qui présente des évidements destinés à recevoir un agent de refroidissement, et une couche d'étanchéité d'enveloppe, qui est conçue pour empêcher l'entrée de liquide de refroidissement depuis l'enveloppe de stator extérieur dans une saillie radiale du noyau feuilleté statorique.
PCT/EP2022/079681 2021-11-22 2022-10-25 Noyau feuilleté pour stator d'une machine d'entraînement électrique Ceased WO2023088643A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202280062509.1A CN118020229A (zh) 2021-11-22 2022-10-25 用于电驱动机器的定子的定子叠片组

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021130498.9 2021-11-22
DE102021130498.9A DE102021130498A1 (de) 2021-11-22 2021-11-22 Statorblechpaket für einen Stator einer elektrischen Antriebsmaschine

Publications (1)

Publication Number Publication Date
WO2023088643A1 true WO2023088643A1 (fr) 2023-05-25

Family

ID=84360539

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2022/079681 Ceased WO2023088643A1 (fr) 2021-11-22 2022-10-25 Noyau feuilleté pour stator d'une machine d'entraînement électrique

Country Status (3)

Country Link
CN (1) CN118020229A (fr)
DE (1) DE102021130498A1 (fr)
WO (1) WO2023088643A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023201718A1 (de) * 2023-02-24 2024-08-29 Zf Friedrichshafen Ag Blechpaket für eine elektrische Maschine, elektrische Maschine, Fahrzeug und Verfahren
DE102023210193A1 (de) * 2023-10-18 2025-04-24 Zf Friedrichshafen Ag Elektrische Maschine mit kraft- und formschlüssig gesicherten Blechpaket sowie Verfahren zur Montage der elektrischen Maschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07264810A (ja) * 1994-03-17 1995-10-13 Okuma Mach Works Ltd 液冷モータ
US20120080965A1 (en) * 2010-10-04 2012-04-05 Bradfield Michael D Coolant Channels for Electric Machine Stator
EP3157138A1 (fr) 2015-10-12 2017-04-19 Siemens Aktiengesellschaft Procede de refroidissement d'un paquet de toles, paquet de toles, rotor, stator et machine electrique
US20190305615A1 (en) * 2018-03-29 2019-10-03 Fanuc Corporation Stator frame, stator, and rotary electric machine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10019914A1 (de) 1999-04-30 2001-02-01 Valeo Equip Electr Moteur Durch ein internes Kühlmittel gekühlter Wechselstromgenerator für Kraftfahrzeuge
DE102005021907B4 (de) 2005-05-12 2024-12-05 Bayerische Motoren Werke Aktiengesellschaft Elektrische Maschine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07264810A (ja) * 1994-03-17 1995-10-13 Okuma Mach Works Ltd 液冷モータ
US20120080965A1 (en) * 2010-10-04 2012-04-05 Bradfield Michael D Coolant Channels for Electric Machine Stator
EP3157138A1 (fr) 2015-10-12 2017-04-19 Siemens Aktiengesellschaft Procede de refroidissement d'un paquet de toles, paquet de toles, rotor, stator et machine electrique
US20190305615A1 (en) * 2018-03-29 2019-10-03 Fanuc Corporation Stator frame, stator, and rotary electric machine

Also Published As

Publication number Publication date
CN118020229A (zh) 2024-05-10
DE102021130498A1 (de) 2023-05-25

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