WO2020030444A1 - Moteur électrique pour un véhicule automobile et stator pour un moteur électrique - Google Patents

Moteur électrique pour un véhicule automobile et stator pour un moteur électrique Download PDF

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Publication number
WO2020030444A1
WO2020030444A1 PCT/EP2019/070172 EP2019070172W WO2020030444A1 WO 2020030444 A1 WO2020030444 A1 WO 2020030444A1 EP 2019070172 W EP2019070172 W EP 2019070172W WO 2020030444 A1 WO2020030444 A1 WO 2020030444A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
electric machine
rotor
air gap
guide
Prior art date
Application number
PCT/EP2019/070172
Other languages
German (de)
English (en)
Inventor
Markus Weiss
Carsten SKROBANEK
Andreas Huber
Original Assignee
Bayerische Motoren Werke Aktiengesellschaft
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 Aktiengesellschaft filed Critical Bayerische Motoren Werke Aktiengesellschaft
Priority to CN201980026931.XA priority Critical patent/CN112042076B/zh
Publication of WO2020030444A1 publication Critical patent/WO2020030444A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • 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
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/48—Fastening of windings on the stator or rotor structure in slots
    • H02K3/487—Slot-closing devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating

Definitions

  • the invention relates to an electric machine for a motor vehicle according to the preamble of claim 1. Further aspects of the invention relate to a stator for such an electric machine and a motor vehicle.
  • Coolant acted upon so can be wetted. Can be used as a cooling medium
  • oil can be used.
  • a motor generator is known from DE 1 1 2009 003 166 T5, in which a coil end cover has a cooling oil channel around a coil end section, a further cooling channel around a further coil end section and one
  • Cooling oil communication channel forms, which connects the cooling channel with the further cooling channel on the inside of a stator core of the motor generator.
  • the motor generator also has an oil guide rib, which prevents oil from flowing in the circumferential direction of the stator core and instead leads the oil to a space on the inside of the stator core.
  • a first aspect of the invention relates to an electric machine for a motor vehicle, comprising a rotatably mounted rotor and a stator, which one
  • the electric machine can also be referred to as an electric machine and can be designed, for example, as an electric motor or as an electric generator.
  • the rotor can comprise a rotor shaft, via which the rotor can be rotatably mounted on a housing element of the electrical machine.
  • the housing element can be a bearing plate, for example.
  • the electric machine can, for example, comprise a roller bearing in order to rotatably support the rotor.
  • the inside of the stator can at least partially delimit the interior of the stator.
  • the inside can preferably be designed in the shape of a hollow cylinder, so that the air gap can have a gap thickness which is at least substantially uniform over an inner circumference of the stator delimited by the inside.
  • Has guide structure by means of which a cooling medium located in the air gap can be guided out of the air gap as a result of a rotary movement of the rotor in the axial direction of extension of the stator. This is advantageous because as a result of this, the cooling medium penetrating into the air gap between the stator and the rotor, which can be oil, for example, in a targeted manner
  • the invention is based on the finding that air contained in the air gap can also be moved as a result of the rotary movement of the rotor.
  • the rotary movement of the rotor can result in an air flow in the air gap, which can also set the cooling medium contained or penetrated in the air gap in motion.
  • the cooling medium that is set in motion in the air gap can then be moved out of the air gap by means of the guide structure.
  • the invention is further based on the knowledge that any frictional losses caused by the cooling medium in the air gap are at least approximately at the third power of a speed at which the rotary movement of the rotor can take place relative to the stator. increase. These friction losses can be significantly reduced by means of the guide structure, so that the electric machine as a whole can be operated with improved efficiency or with lower losses.
  • the guide structure can be used to prevent the cooling medium from remaining in the air gap for a prolonged period and only being moved, for example, in the circumferential direction of the stator. Such a longer stay in the air gap can lead to damage to the cooling medium, especially if the cooling medium is an oil.
  • An example of damage here is coking due to high heat input and a lack of oil exchange in the air gap.
  • the cooling medium can preferably be added to the guide structure
  • Axial extension direction can also be performed in the circumferential direction of the stator along the inside. This is advantageous since the coolant can thereby be guided over a particularly large area within the air gap before the coolant is moved out of the air gap, as a result of which a particularly large-area cooling by the cooling medium can take place before it emerges from the air gap.
  • the stator comprises one
  • Stator main body which has at least one stator slot with a slot interior provided for receiving at least a partial area of a stator winding.
  • the stator groove can be designed as a groove which can extend along the stator main body.
  • the stator groove can preferably extend over the stator main body in the axial direction of extension of the stator.
  • the stator can include the stator winding.
  • the stator base body can be designed as a so-called stator laminated core.
  • the stator base body has a stator yoke and at least one stator tooth projecting inward from the stator yoke in the radial direction of extension of the stator, which at least partially delimit the at least one stator groove.
  • the stator yoke and the at least one stator tooth delimit the at least one stator groove at least in regions.
  • a particularly defined one can advantageously be positioned over the stator tooth Guidance of field lines of a magnetic field take place during operation of the electric machine. It is clear that the stator body in addition to the stator yoke a plurality
  • Stator teeth can include.
  • Each of the stator teeth can preferably be connected in one piece to the stator yoke, so that the stator can be handled particularly easily when it is assembled.
  • the at least one stator groove can extend between two adjacent stator teeth of the plurality of stator teeth. The two adjacent stator teeth of the plurality of stator teeth can delimit the groove interior in some areas.
  • the at least one stator tooth has a stator tooth surface facing away from the stator yoke, which at least partially forms the inside of the stator and over which the
  • Management structure extends at least partially. In other words, it can
  • stator tooth surface at least a portion of the inside. Such a configuration is advantageous because the stator tooth surface is therefore a
  • Double function can occur, so that on the one hand this can contribute to the magnetic field guidance during operation of the electric machine and on the other hand it can serve to lead out the cooling medium located in the air gap. As a result, it is not necessary to provide the guide structure as a separate component.
  • the stator has at least one closure element which is held on the at least one stator tooth and at least the interior of the groove in the radial direction of extension inwards
  • Cooling medium can be prevented in the groove interior when operating the electric machine.
  • the at least one closure element can preferably be designed in the form of a rail and can therefore be mounted particularly easily on the at least one stator tooth.
  • the closure element can particularly preferably be designed as a wedge, which can also be referred to as a slot wedge, which enables a particularly tight and simple closing of the slot interior.
  • the at least one closure element can preferably be accommodated at least in regions in the at least one stator groove, as a result of which an improved
  • Securing of the closure element can take place.
  • the at least one closure element is reversibly detachably held on the at least one stator tooth. This is advantageous because it enables simple retrofitting and / or non-destructive removal of the closure element as part of maintenance work.
  • the at least one closure element and the at least one stator tooth can, for example, form-fit with one another.
  • the closure element can be positively connected to the stator tooth.
  • the form fit enables particularly simple assembly and disassembly of the closure element.
  • the positive connection can be formed, for example, by a dovetail connection between the closure element and the stator tooth.
  • the at least one closure element has an element top facing away from the groove interior, which at least partially forms the inside of the stator and over which the stator is formed
  • Management structure extends at least partially.
  • the top of the element can at least partially form the inside of the stator, ie face the air gap and delimit it in some areas. This is particularly advantageous since the closure element can thus have a double function.
  • the closure element can be used to close the groove interior and, on the other hand, to guide the cooling medium out of the air gap. That’s why
  • Closure element to a particular extent for low-loss operation of the electric machine.
  • the guide structure has at least one guide element, which extends on the inside of the stator and which, at least in its main direction of extension, is unorthogonal and non-parallel to one that is assigned to the stator and perpendicular to it
  • Axial direction is oriented center plane. This is advantageous since the cooling medium located in the air gap due to this unorthogonal and non-parallel orientation of the at least one guide element as a result of the rotational movement of the Rotor can be guided particularly effectively out of the air gap.
  • the expression “unorthogonal” is to be understood as “not orthogonal”, that is to say “not perpendicular”.
  • the expression “non-parallel” is to be understood as “not parallel”.
  • the middle plane is to be understood as a plane in the mathematical sense through which a center of the stator can be defined.
  • the at least one guide element is designed as a rib or as a groove. This is advantageous since a rib or groove is, as it were, particularly easy to manufacture and enables the cooling medium to be guided effectively.
  • the at least one guide element has at least two element side faces which run along the
  • the inside of the stator is oriented towards each other at an acute angle. This is advantageous because the acute angle prevents the cooling medium from being stowed on the guide element and prevents the cooling medium from being divided into individual cooling medium flows instead.
  • the individual cooling medium streams can wet a particularly large area of the electric machine when they are led out of the air gap and thus achieve a particularly good cooling effect before leaving the air gap.
  • At least one element side surface of the at least two element side surfaces can form an angle with an in
  • the at least two element side faces can also be oriented symmetrically to the main direction of extension.
  • the guide structure comprises at least two guide elements which are aligned symmetrically to one another with respect to the central plane.
  • the middle plane can be one
  • a second aspect of the invention relates to a stator for an electric machine according to the first aspect of the invention.
  • a stator can have a stator interior, into which a rotor of the electric machine can be inserted at least in regions, forming an air gap, and can be spaced in the radial extension direction of the stator from an inside of the stator facing the rotor.
  • the inside of the stator can have a guide structure, by means of which a cooling medium located in the air gap as a result of a rotary movement of the rotor in
  • a third aspect of the invention relates to a motor vehicle with an electric machine according to the first aspect of the invention and additionally or alternatively with a stator according to the second aspect of the invention.
  • 1 is a sectional view of a portion of an electric machine
  • Fig. 2 is a perspective view of a portion of a stator body of a stator of the electric machine, with several of one
  • FIG. 3 shows a plan view of the respective stator tooth surfaces of the stator teeth, in which guide elements which are oriented symmetrically to a central plane and are arranged on the stator tooth surfaces can be seen;
  • Fig. 4 shows a further perspective view of the partial area of the stator body, with respective groove interiors more
  • Stator slots are closed by respective closure elements
  • FIG. 5 shows a plan view of the respective tops of the elements of the closure elements in accordance with an area A outlined in FIG. 4;
  • Fig. 6 is a perspective view of a portion of one of the
  • FIG. 1 shows a sectional illustration of a partial area of an electric machine 1 which, as a drive motor, is only shown schematically in FIG. 1 in the present case
  • the sub-area here shows a quadrant and thus a quarter of the electric machine 1.
  • the electric machine 1 can be designed, for example, as an electric motor, in short an electric motor.
  • the electric machine 1 can also be operated as a generator.
  • the electric machine 1 comprises a rotatably mounted rotor 2 and a stator 3, which has a stator interior 4, into which the rotor 2 is inserted and spaced from an inner side 7 of the stator 3 facing the rotor 2 by an air gap 5 in the radial direction 6 of the stator 3 ,
  • the rotor 2 can be rotatably mounted on a housing element of the electrical machine 1, which is not shown here, via a rotor shaft of the rotor 2.
  • the stator 3 has on its inside 7 a guide structure 8, shown at least partially in each case in FIGS. 2 to 6, by means of which a cooling medium 9 located in the air gap 5 as a result of a rotary movement 10 of the rotor 2 in
  • Axial extension direction 1 1 of the stator 3 can be guided out of the air gap 5.
  • the cooling medium can be dragged along in the direction of the rotary movement 10 along the inside 7, as is shown by way of example in FIGS. 3 and 5.
  • the stator 3 comprises a stator main body 12 shown partially and enlarged in FIG. 2, which has a plurality of stator slots 13, each with a slot interior 15 provided for receiving at least a partial area of a stator winding 14.
  • stator 3 comprises stator winding 14, the latter, however, is only shown in FIG. 1 for reasons of clarity.
  • the stator body 12 has a stator yoke 16 and a plurality of in
  • stator teeth 17 are integrally connected to the stator yoke 16.
  • the stator teeth 17 each have a stator yoke 16 facing away
  • Stator tooth surface 18 which at least partially forms the inside 7 of the stator 3 and over which the guide structure 8 extends at least partially.
  • the respective stator tooth surfaces 18 can be seen particularly clearly in FIGS. 2 and 3.
  • the stator 3 can also have a multiplicity of closure elements 19, which for example can each be held on two adjacent stator teeth 17 in each case with the formation of a form fit and thus reversibly releasably, and can in each case close one of the respective groove interiors 15 in the radial direction 6 at least in regions.
  • the closure elements are present
  • closure elements 19 each have an element upper side 20 facing away from the groove interior 15, which at least partially forms the inner side 7 of the stator 3 and over which the guide structure 8 can partially extend, as can be seen in particular in FIGS. 4 and 5.
  • the guide structure 8 has a multiplicity of guide elements 21, 22 which extend on the inside 7 of the stator 3 and which extend in the latter
  • Main direction of extent 23 is unorthogonal and non-parallel to one, the stator 3 assigned and oriented perpendicular to the axial extension direction 1 1 center plane 24, as can be seen in particular in FIGS. 3 and 5.
  • the guide elements 21, 22 are designed as respective ribs, but can also be designed as grooves.
  • the guide elements 21, 22 have two element side surfaces 25, 26, which are oriented towards each other along the inside 7 of the stator 3 at an acute angle a, as shown in FIG. 5.
  • the guide elements 21 are aligned symmetrically with respect to the guide elements 22 with respect to the central plane 24, so that the cooling medium 9 indicated in FIGS. 3 and 5 by a respective arrow at opposite ends of the stator 3 and thus in a particularly short way out of the Air gap 5 can be guided out.
  • the guide structure 8 can preferably extend over at least some of the stator tooth surfaces 18 as well as over at least some of the element tops 20, which is shown here only in regions in FIG. 1. This allows the cooling medium 9 to be guided particularly quickly out of the air gap 5.
  • the guide structure 8 serves as an oil guide contour, which can be provided directly on the stator 3 in order to convey the oil (cooling medium 9) from the air gap 5 during operation.
  • oil guide ribs can, for example, be arranged on the closure elements 19, which are designed here as special slot wedges, and can be inserted as separate components in respective slot slots of the stator slots 13 of the stator 3. Additionally or alternatively, the oil guide ribs can also be shown directly as stamped contours in the stator core (stator body 12).
  • the cooling medium 9 can thus be effectively conveyed out of the air gap 5 on the basis of the guide structure 8 when the electric machine 1 is operating.
  • Loss of oil friction and thus energy consumption of the electric machine 1 can thereby be significantly reduced.
  • the efficiency of the electric machine 1 can thereby be increased, which can lead to an increase in the range of the motor vehicle 28 if the battery capacity of a battery to which the electric machine 1 can be coupled for exchanging electrical energy remains the same.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'invention concerne un moteur électrique (1) pour un véhicule automobile (28), qui comprend un rotor (2) monté de manière à pouvoir tourner et un stator (3), lequel comporte un espace intérieur de stator (4), dans lequel le rotor (2) est introduit au moins par endroits et est espacé d'un côté intérieur (7), tourné vers le rotor (2), du stator (3) par un entrefer (5) dans la direction d'extension radiale (6) du stator (3). Le stator (3) comporte sur son côté intérieur (7) une structure de guidage (8), au moyen de laquelle un milieu frigorifique (9) se trouvant dans l'entrefer (5) peut être guidé hors de l'entrefer (5) suite à un déplacement de rotation (10) du rotor (2) dans la direction d'extension axiale (11) du stator (3). L'invention concerne selon un autre aspect un stator (3) pour un moteur électrique (1).
PCT/EP2019/070172 2018-08-10 2019-07-26 Moteur électrique pour un véhicule automobile et stator pour un moteur électrique WO2020030444A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201980026931.XA CN112042076B (zh) 2018-08-10 2019-07-26 用于机动车的电机和用于电机的定子以及机动车

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018213558.4A DE102018213558A1 (de) 2018-08-10 2018-08-10 Elektromaschine für ein Kraftfahrzeug und Stator für eine Elektromaschine
DE102018213558.4 2018-08-10

Publications (1)

Publication Number Publication Date
WO2020030444A1 true WO2020030444A1 (fr) 2020-02-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/070172 WO2020030444A1 (fr) 2018-08-10 2019-07-26 Moteur électrique pour un véhicule automobile et stator pour un moteur électrique

Country Status (3)

Country Link
CN (1) CN112042076B (fr)
DE (1) DE102018213558A1 (fr)
WO (1) WO2020030444A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021122962A1 (de) 2021-09-06 2023-03-09 Bayerische Motoren Werke Aktiengesellschaft Kühlmittelableitkontur an einem Statorwickelkopf

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022117273A1 (de) 2022-07-12 2024-01-18 Bayerische Motoren Werke Aktiengesellschaft Kühlmittel-Abscheideeinheit für eine elektrische Maschine

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US1504622A (en) * 1920-06-09 1924-08-12 Westinghouse Electric & Mfg Co System of ventilation
CH545027A (de) * 1972-05-09 1973-11-30 Bbc Brown Boveri & Cie Elektrische Maschine
DE3014319A1 (de) * 1979-04-27 1980-12-04 Ts K Bjuro Modernizacii Deistv Elektrische maschine mit gaskuehlung
JPH10229653A (ja) * 1997-02-17 1998-08-25 Meidensha Corp 回転電機の通風冷却構造
DE112009003166T5 (de) 2008-11-21 2012-06-28 Toyota Jidosha K.K. Rotierende elektrische Maschine

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JPH11166500A (ja) * 1997-12-03 1999-06-22 Toshiba Ave Co Ltd ポンプ
JP3603784B2 (ja) * 2000-12-14 2004-12-22 日産自動車株式会社 回転電機
EP2182611B1 (fr) * 2008-10-28 2013-03-06 Siemens Aktiengesellschaft Agencement pour le refroidissement d'une machine électrique
JP5725003B2 (ja) * 2012-12-26 2015-05-27 トヨタ自動車株式会社 回転電機
US20180038388A1 (en) * 2015-03-18 2018-02-08 Mitsubishi Heavy Industries, Ltd. Compressor system
EP3353878B1 (fr) * 2015-09-21 2019-05-15 Siemens Aktiengesellschaft Machine electrique dotee de fentes d'aeration radiales et eolienne
DE102016118723B3 (de) * 2016-10-04 2018-02-01 Magna Powertrain Bad Homburg GmbH Elektrische Maschine für ein Kraftfahrzeug

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1504622A (en) * 1920-06-09 1924-08-12 Westinghouse Electric & Mfg Co System of ventilation
CH545027A (de) * 1972-05-09 1973-11-30 Bbc Brown Boveri & Cie Elektrische Maschine
DE3014319A1 (de) * 1979-04-27 1980-12-04 Ts K Bjuro Modernizacii Deistv Elektrische maschine mit gaskuehlung
JPH10229653A (ja) * 1997-02-17 1998-08-25 Meidensha Corp 回転電機の通風冷却構造
DE112009003166T5 (de) 2008-11-21 2012-06-28 Toyota Jidosha K.K. Rotierende elektrische Maschine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021122962A1 (de) 2021-09-06 2023-03-09 Bayerische Motoren Werke Aktiengesellschaft Kühlmittelableitkontur an einem Statorwickelkopf

Also Published As

Publication number Publication date
CN112042076B (zh) 2023-04-07
CN112042076A (zh) 2020-12-04
DE102018213558A1 (de) 2020-02-13

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