WO2020127379A1 - Moteur électrique - Google Patents

Moteur électrique Download PDF

Info

Publication number
WO2020127379A1
WO2020127379A1 PCT/EP2019/085793 EP2019085793W WO2020127379A1 WO 2020127379 A1 WO2020127379 A1 WO 2020127379A1 EP 2019085793 W EP2019085793 W EP 2019085793W WO 2020127379 A1 WO2020127379 A1 WO 2020127379A1
Authority
WO
WIPO (PCT)
Prior art keywords
stator
cooling
electric motor
cooling medium
outside
Prior art date
Application number
PCT/EP2019/085793
Other languages
German (de)
English (en)
Inventor
Hermann Bäumel
Christian Böhm
Steffen Hahn
Original Assignee
Vitesco Technologies Germany 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 Vitesco Technologies Germany Gmbh filed Critical Vitesco Technologies Germany Gmbh
Publication of WO2020127379A1 publication Critical patent/WO2020127379A1/fr

Links

Classifications

    • 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
    • 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
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the invention relates to an electric motor, in particular for driving an oil pump.
  • Motor outer jacket including a deflection in the end shields of the motor.
  • the large number of cooling channels increases the installation space of the engine and there is pressure loss in the cooling circuit.
  • the object of the invention is to provide an electric motor designed as an internal rotor with efficient cooling.
  • the electric motor according to the invention can be used for any purpose.
  • the electric motor is used to drive an oil pump, in particular an oil pump for circulating oil in a motor vehicle.
  • the electric motor is designed as an internal rotor, i.e. it includes one
  • the stator and the rotor extend in an axial direction along an axis of rotation about which the rotor rotates when the electric motor is in operation.
  • the stator and the rotor are arranged in a motor housing in which a cooling circuit for guiding cooling medium is formed.
  • the stator or rotor can be a stator or rotor known per se.
  • the stator is preferably designed as a laminated core with electrical windings.
  • Cooling circuit includes a cooling path which runs adjacent to and in particular on the outside for cooling the stator, which limits the stator in the radial direction with respect to the axis of rotation.
  • This cooling path is like this formed that the cooling medium is transported in the circumferential direction with respect to the axis of rotation around the outside of the stator.
  • the cooling medium is preferably transported in a spiral around the outside of the stator, ie the transport direction of the cooling medium has a component in addition to
  • Circumferential direction also a component in the axial direction.
  • the invention has the advantage that efficient cooling is effected locally in the area of the stator by a flow of the cooling medium in the circumferential direction around the stator. In particular, this allows the length of the cooling circuit to be shortened and pressure losses in the cooling circuit to be avoided.
  • the cooling path is limited in the axial direction by two opposite ends of the stator.
  • the cooling path extends along the entire axial length of the stator, so that very good cooling of the entire stator is ensured.
  • the motor housing of the electric motor according to the invention comprises one or more spirally on the
  • Ribs running outside the stator which are part of the cooling path and transport the cooling medium around the outside of the stator.
  • a volume flow around the stator can be easily achieved for the removal of heat.
  • a turbulator can be provided in the cooling path, which is designed in such a way that it swirls the flow of the cooling medium in the cooling path in such a way that the cooling medium is transported around the outside of the stator.
  • Turbulators are known per se from the prior art. It is within the scope of professional action, the turbulator like that
  • the turbulator is implemented as an insert that is positioned in the cooling path.
  • Insert can be made of plastic, for example.
  • the embodiment just described, which uses a turbulator, can be designed such that no spiral ribs are formed in the cooling path. Nevertheless, the turbulator can also be combined with the variant described above, which uses spiral ribs.
  • the electric motor according to the invention comprises an electronic device for controlling it, the cooling circuit including a cooling section which is guided past the electronic device in order to effect cooling thereof.
  • the cooling circuit can thus be used both for cooling the stator and for cooling the electronic ones
  • the cooling section is provided adjacent to an inlet opening for supplying the cooling medium to the cooling circuit in the motor housing. In this way, a structure of the electric motor can be achieved in which the electronic device is easily accessible.
  • stator is delimited by an outer housing impermeable to the cooling medium, the outer surface of which forms the outside of the stator. This protects the inner area of the stator against the ingress of cooling medium.
  • the stator has one for the cooling medium
  • impermeable outer coating which forms its outside.
  • This outer coating which can be made very thin in the range from 100 to 200 ⁇ m, ensures good heat transfer between the cooling medium and the stator.
  • the outer coating is a ceramic and / or metallic coating which efficiently protects the stator from the ingress of cooling medium.
  • FIG. 1 is a cross-sectional view of an embodiment of a
  • FIG. 2 shows a section through the electric motor of FIG. 1 along the line I-1;
  • Fig. 3 is a cross-sectional view analogous to Fig. 1, which is an alternative
  • Embodiment of the electric motor according to the invention shows.
  • a variant of the invention is described below with reference to an electric motor for an oil pump in a motor vehicle.
  • the electric motor can also be designed for other purposes.
  • the electric motor is designated by reference number 1.
  • the electric motor comprises one in a manner known per se
  • FIG. 1 also shows the rotor axis A, which in this figure extends perpendicular to the plane of the blade and corresponds to the axial direction of the electric motor.
  • the stator and the rotor are cylindrical and extend in the axial direction along the axis A. This can be seen from the sectional view of FIG. 2. As can be seen there, the stator 3 extends between a left and a right axial end along the axis A. The same applies to the rotor, which cannot be seen from FIG. 2 due to the selected cutting line l-l.
  • the stator 3 and the rotor 4 are in a lower portion of a motor housing
  • the lower section is connected to an upper section of the
  • Coupled motor housing so that an inlet 9 of cooling medium is formed from the upper section to the lower section, as will be described in more detail below.
  • a seal in the form of an O-ring 14 is provided in the inlet 9.
  • the stator 3 is in a known manner as a laminated core with electrical
  • Cooling circuit formed, which comprises sections 7, 8, 9, 10 and 17.
  • a liquid cooling medium preferably water or a mixture of water and glycol, for example in equal proportions of water and glycol, flows in the cooling circuit.
  • the direction of flow of the cooling medium is indicated by arrows P in FIG. 1 and also in FIGS. 2 and 3. Heat generated by the electric motor and possibly also heat which additionally acts on the motor from the outside via the motor housing 2 can be dissipated via the cooling circuit.
  • the stator 3 is pressed into a metallic cylindrical housing 5, which is produced by deep drawing.
  • the housing 5 is part of the stator 3.
  • the outside of the housing 5 is designated by reference numeral 6 in FIG. 1 and also forms the outside of the stator 3.
  • the housing 5 is usually also referred to as a cartridge.
  • the cooling medium enters the cooling circuit via an inlet opening 7 and is first passed through a cooling section 8.
  • a cooling section 8 In the area of this cooling section there is a heat sink 11, which has pins 12 projecting downwards, which for reasons of clarity are only partially designated with this reference symbol.
  • the pins have a diamond-shaped shape in cross section in the horizontal direction in FIG. 1.
  • the cooling medium is guided in the cooling section 8 around the pins 12, so that good heat transfer takes place between the cooling medium and the cooling body 11.
  • An electronic device is located above the heat sink, which is only indicated schematically by a circuit carrier 13 on which the corresponding electronic circuit is located.
  • the cooling medium After passing through the cooling section 8, the cooling medium is deflected downward. In the area of the deflection, a deflection plug 15 is provided for sealing the cooling circuit.
  • the cooling medium then flows down via the inlet 9 into a cooling path 10 which extends around the outer circumference of the outside 6 of the stator 3. This cooling path ensures that the cooling medium for cooling the stator flows in the circumferential direction around the outside 6 thereof.
  • spirally extending ribs are used in the electric motor of FIGS. 1 and 2. This can be seen from the sectional view of FIG. 2.
  • the section of this figure (line II of FIG. 1) is selected in the region of the inlet 9 and thus does not run through the axis of rotation A.
  • FIG. 2 an upper section and a lower section can be seen from FIG.
  • the front edge of the spiral rib rests on the outside 6 of the stator in order to thereby cause the cooling medium to spiral around the stator.
  • a seal in the form of an O-ring 18 is provided at each axial end of the stator 3, which seals against the
  • the symbols SY1 and SY2 are used in addition to the arrow P to indicate the direction of flow of the cooling medium.
  • the symbol SY1 indicates a flow direction perpendicular to the leaf plane of FIG. 2 from this, whereas the symbol SY2 indicates a flow direction in the opposite direction into the leaf plane.
  • the spiral rib guides the cooling medium in the cooling path 10 from the left to the right axial end of the stator 3. After the stator rotates, the cooling medium finally emerges from the motor housing 2 via an outlet 17. The cooling medium then flows to a heat exchanger for removing heat and then re-enters the motor housing 2 via the inlet 7.
  • a feed pump is provided to convey the cooling medium, which is not shown in the figures.
  • a space-saving geometry of the cooling path 10 between the motor housing 2 and the outside 6 of the stator 3 can be achieved by the spiral rib 16.
  • the cooling path 10 is limited to the stator 3, so that long cooling channels can be dispensed with and the pressure loss in the cooling circuit can be minimized. The cooling therefore only takes place where it is necessary.
  • a coherent cooling circuit is created both for the electric motor and for its electronics, as a result of which the electric motor can be realized in a space-saving and cost-saving manner.
  • the rib 16 causes forced convection in the form of a laminar flow and thereby improves the removal of heat from the electric motor. This leads to an increase in efficiency, since the laminar volume flow means that more heat can be removed.
  • a turbulator 19 in the form of an insert is used in the cooling path 10 instead of a spiral rib.
  • the turbulator is only indicated schematically as a jagged component.
  • Turbulators are known per se from the prior art and enable the generation of turbulent flow.
  • the turbulator 19 of FIG. 3 is shaped such that the turbulent flow is distributed in such a way that the cooling medium in the cooling path 10 is guided around the outside 6 of the stator 3.
  • Turbulators are inexpensive to produce and thus enable a cooling path to be implemented simply and inexpensively, in which the cooling medium is transported around the outside of the stator. Due to the turbulent flow
  • FIG. 3 can optionally also be combined with the embodiment of FIG. 1. That is, both the spiral rib 16 and the turbulator 17 can be provided in the cooling path 10.
  • the stator 3 is delimited by a cartridge 5 which prevents the cooling medium from penetrating into the interior of the stator.
  • the cartridge is omitted and instead a coating impermeable to the cooling medium is provided on the outside of the stator, such as a ceramic or a metallic coating. In this way, the heat transfer between the stator and the cooling medium can be increased again and an additional increase in the heat removal through the cooling medium can be achieved.
  • the embodiments of the invention described above have a number of advantages. In particular, a cooling circuit in one
  • Electric motor created that includes a locally limited cooling path for the stator.
  • a spiral rib and / or a turbulator can be used.
  • the cooling circuit can also be used to cool the electronics in the electric motor, which leads to a reduction in installation space and cost savings.
  • the cooling of the stator can be further improved in that the stator is not arranged in a cartridge, but with one for the cooling medium

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

L'invention concerne un moteur électrique, en particulier pour l'entraînement d'une pompe à huile. Selon l'invention, le moteur électrique comprend un stator (3) externe disposé autour d'un rotor (4) interne, le stator (3) et le rotor (4) s'étendant dans une direction axiale le long d'un axe de rotation (A) autour duquel le rotor (4) tourne pendant le fonctionnement du moteur électrique (1), et le stator (3) et le rotor (4) étant disposés dans un carter de moteur (2) dans lequel est formé un circuit de refroidissement (7, 8, 9, 10, 17) pour guider le fluide de refroidissement. Selon l'invention, le moteur électrique est caractérisé en ce que le circuit de refroidissement (7, 8, 9, 10, 17) comprend un chemin de refroidissement (10) qui, pour refroidir le stator (3), passe près de sa face extérieure (6) qui délimite le stator (3) dans la direction radiale par rapport à l'axe de rotation (A), le chemin de refroidissement (10) étant conçu de telle manière que le fluide de refroidissement soit transporté autour de la face extérieure (5a) du stator (3) dans la direction circonférentielle par rapport à l'axe de rotation (A).
PCT/EP2019/085793 2018-12-21 2019-12-17 Moteur électrique WO2020127379A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018222734.9 2018-12-21
DE102018222734.9A DE102018222734A1 (de) 2018-12-21 2018-12-21 Elektromotor

Publications (1)

Publication Number Publication Date
WO2020127379A1 true WO2020127379A1 (fr) 2020-06-25

Family

ID=69061344

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2019/085793 WO2020127379A1 (fr) 2018-12-21 2019-12-17 Moteur électrique

Country Status (2)

Country Link
DE (1) DE102018222734A1 (fr)
WO (1) WO2020127379A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4152573A1 (fr) * 2021-09-15 2023-03-22 Robert Bosch GmbH Logement d'un module e-essieu

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020212864A1 (de) 2020-10-12 2022-04-14 Volkswagen Aktiengesellschaft Elektromaschine für ein Fahrzeug

Citations (13)

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Publication number Priority date Publication date Assignee Title
US3009072A (en) * 1958-01-28 1961-11-14 Scott L & Electromotors Ltd Fluid cooled motors
FR2705842A3 (fr) * 1993-05-28 1994-12-02 Steyr Daimler Puch Ag Ensemble d'entraînement pour électromobile.
US6198183B1 (en) * 1998-04-18 2001-03-06 Daimlerchrysler Ag Integrated electric drive unit including an electric motor and an electronic control and monitoring module
US7728467B2 (en) * 2007-01-26 2010-06-01 Aisin Aw Co., Ltd. Heat generating member cooling structure and drive unit
DE102009050090A1 (de) * 2009-10-20 2011-04-21 Sew-Eurodrive Gmbh & Co. Kg Anordnung, insbesondere Kühlanordnung, mit Kühlkanal und Elektromotor
KR20150062529A (ko) * 2012-12-03 2015-06-08 엘지전자 주식회사 전기자동차
DE102013021745A1 (de) * 2013-12-20 2015-06-25 Sew-Eurodrive Gmbh & Co Kg Umrichtermotor
US20160294231A1 (en) * 2015-04-02 2016-10-06 Hamilton Sundstrand Corporation Stator heat transfer feature
DE102015214770A1 (de) * 2015-08-03 2017-02-09 Zf Friedrichshafen Ag Gehäuse für eine Antriebseinheit für ein Fahrzeug, Antriebseinheit für ein Fahrzeug und Verfahren zum Herstellen einer Antriebseinheit für ein Fahrzeug
EP3203614A1 (fr) * 2014-09-30 2017-08-09 Nissan Motor Co., Ltd Système de machine électrique tournante
FR3052305A1 (fr) * 2016-06-06 2017-12-08 Moteurs Leroy-Somer Carcasse de machine electrique
WO2017211360A1 (fr) * 2016-06-09 2017-12-14 Rainer Puls Boîtier de refroidissement pour un moteur électrique
US20180026493A1 (en) * 2016-07-20 2018-01-25 Lg Electronics Inc. Case for electric motor

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Publication number Priority date Publication date Assignee Title
US7009317B2 (en) * 2004-01-14 2006-03-07 Caterpillar Inc. Cooling system for an electric motor
US8963384B2 (en) * 2010-06-21 2015-02-24 Nidec Motor Corporation Electric motor assemblies including stator and/or rotor cooling
DE102011075045A1 (de) * 2011-05-02 2012-11-08 Schaeffler Technologies AG & Co. KG Kühlmantel und Umlenkeinheit für Kühlmäntel
DE102016000985A1 (de) * 2016-01-29 2016-09-29 Daimler Ag Verfahren zum Herstellen einer elektrischen Maschine und elektrische Maschine
DE102016216019A1 (de) * 2016-08-25 2018-03-01 Continental Automotive Gmbh Einsatz für einen Kühlmantel einer elektrischen Maschine

Patent Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3009072A (en) * 1958-01-28 1961-11-14 Scott L & Electromotors Ltd Fluid cooled motors
FR2705842A3 (fr) * 1993-05-28 1994-12-02 Steyr Daimler Puch Ag Ensemble d'entraînement pour électromobile.
US6198183B1 (en) * 1998-04-18 2001-03-06 Daimlerchrysler Ag Integrated electric drive unit including an electric motor and an electronic control and monitoring module
US7728467B2 (en) * 2007-01-26 2010-06-01 Aisin Aw Co., Ltd. Heat generating member cooling structure and drive unit
DE102009050090A1 (de) * 2009-10-20 2011-04-21 Sew-Eurodrive Gmbh & Co. Kg Anordnung, insbesondere Kühlanordnung, mit Kühlkanal und Elektromotor
KR20150062529A (ko) * 2012-12-03 2015-06-08 엘지전자 주식회사 전기자동차
DE102013021745A1 (de) * 2013-12-20 2015-06-25 Sew-Eurodrive Gmbh & Co Kg Umrichtermotor
EP3203614A1 (fr) * 2014-09-30 2017-08-09 Nissan Motor Co., Ltd Système de machine électrique tournante
US20160294231A1 (en) * 2015-04-02 2016-10-06 Hamilton Sundstrand Corporation Stator heat transfer feature
DE102015214770A1 (de) * 2015-08-03 2017-02-09 Zf Friedrichshafen Ag Gehäuse für eine Antriebseinheit für ein Fahrzeug, Antriebseinheit für ein Fahrzeug und Verfahren zum Herstellen einer Antriebseinheit für ein Fahrzeug
FR3052305A1 (fr) * 2016-06-06 2017-12-08 Moteurs Leroy-Somer Carcasse de machine electrique
WO2017211360A1 (fr) * 2016-06-09 2017-12-14 Rainer Puls Boîtier de refroidissement pour un moteur électrique
US20180026493A1 (en) * 2016-07-20 2018-01-25 Lg Electronics Inc. Case for electric motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4152573A1 (fr) * 2021-09-15 2023-03-22 Robert Bosch GmbH Logement d'un module e-essieu

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Publication number Publication date
DE102018222734A1 (de) 2020-06-25

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