WO2018153598A1 - Moteur électrique pour véhicule automobile - Google Patents

Moteur électrique pour véhicule automobile Download PDF

Info

Publication number
WO2018153598A1
WO2018153598A1 PCT/EP2018/051625 EP2018051625W WO2018153598A1 WO 2018153598 A1 WO2018153598 A1 WO 2018153598A1 EP 2018051625 W EP2018051625 W EP 2018051625W WO 2018153598 A1 WO2018153598 A1 WO 2018153598A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling
rotor
stator
coolant
cooling circuit
Prior art date
Application number
PCT/EP2018/051625
Other languages
German (de)
English (en)
Inventor
Dominik Erlebach
Markus PANHUBER
Christoph Öberseder
Original Assignee
Magna powertrain gmbh & co kg
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 Magna powertrain gmbh & co kg filed Critical Magna powertrain gmbh & co kg
Publication of WO2018153598A1 publication Critical patent/WO2018153598A1/fr

Links

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
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/32—Rotating 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
    • 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
    • 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
    • H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
    • 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
    • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator

Definitions

  • the present invention relates to an electric machine for a motor vehicle comprising a housing, a stator, wherein the stator is cooled by a stator cooling circuit, wherein the stator cooling circuit is connected to an external cooling circuit, and a rotor, wherein the rotor is cooled via a rotor cooling circuit, wherein the rotor cooling circuit is an internal, closed cooling circuit.
  • asynchronous machines such as synchronous machines
  • a cooling device is generally provided in electrical machines, which cools the stator and / or the rotor of the electric machine.
  • Numerous measures for cooling electrical machines are known from the prior art.
  • the most common types of cooling are air cooling and liquid cooling.
  • cooling channels associated with the cooling are connected to an external cooling circuit, such as, for example, the cooling circuit of a water-cooled internal combustion engine.
  • the document DE 43 15 280 A1 describes, for example, an electric machine with an external rotor, which is rotatably mounted on a stand.
  • the stator In the interior of the stator, namely radially below the stator lamination stack, at least one cooling jacket through which cooling fluid flows is arranged.
  • the stator has at least one cooling channel through which a circulating internal cooling medium, preferably air, flows.
  • a cooling jacket for the cooling liquid and at least one cooling channel for the cooling air are shown.
  • the document US 2014/0368064 A1 discloses a cooling system for an electric motor with at least one heat pipe in a hollow region of the rotor shaft of the electric motor. One end of the heat pipe extends beyond one end of the rotor shaft and is coupled to a heat exchanger, for example to a heat sink whose fins are designed as fan blades.
  • an electrical machine for a motor vehicle comprising a housing, a stator, wherein the stator can be cooled by a stator cooling circuit, wherein the stator cooling circuit is connected to an external cooling circuit and has a cooling jacket, which is arranged on the stator, and a rotor, wherein the rotor is cooled via a rotor cooling circuit, wherein the rotor cooling circuit is an internal, closed cooling circuit having a heat exchanger, wherein the heat exchanger is formed by the cooling jacket of the stator cooling circuit.
  • the electric machine comprises a housing, a stator and a rotor.
  • the stator is cooled via a stator cooling circuit and the rotor via a rotor cooling circuit. That is, the stator cooling circuit is used, if necessary, the cooling of the stator of the electric machine and the rotor cooling circuit is used, if necessary, the cooling of the rotor of the electric machine.
  • the stator cooling circuit according to the invention is connected to an external cooling circuit and has a cooling jacket, which is arranged on the stator.
  • the external cooling circuit can be, for example, the cooling circuit of a water-cooled internal combustion engine.
  • the external cooling circuit may also serve to cool other vehicle components, such as an inverter.
  • the external cooling circuit uses a cooling device for cooling a coolant.
  • This cooling device can be designed, for example, as a heat exchanger, a liquid circuit or an air cooling system.
  • a coolant is to be understood as meaning any coolant known to the person skilled in the art which can be used for cooling electrical machines.
  • the rotor cooling circuit according to the invention is an internal, closed cooling circuit which has a heat exchanger.
  • the term "internal, closed cooling circuit” is to be understood in particular as meaning a cooling circuit which is not connected to an external cooling circuit and which is not connected to another cooling circuit, here the
  • Stator cooling circuit is coupled. Both the stator cooling circuit and the rotor cooling circuit are to be understood as integral components of the electrical machine.
  • the heat exchanger of the rotor cooling circuit is formed by the cooling jacket of the stator cooling circuit.
  • the advantages achieved by the invention are in particular that the electric machine can be represented with respect to efficient cooling of the stator as well as the rotor with minimal component and thus cost.
  • the cooling jacket of Statorkühlniklaufs as a heat exchanger for the rotor cooling circuit can generate a synergy effect that allows generating a component and cost-optimized design of the electric machine and continue to provide a needs-based cooling of the stator and the rotor safely.
  • the interfaces with an external cooling circuit are minimized and thus the risk of undesired contamination of the coolant within the cooling circuits is reduced, whereby a reliable operation of the electrical machine can be ensured.
  • the electric machine is designed in an inner rotor design with a radially outer stator, wherein the cooling jacket surrounding the stator at least partially, preferably over a range of 180 ° to 300 °, the outer circumference.
  • the rotor is therefore circumferentially surrounded by the stator from radially inward to radially outward
  • the cooling jacket of the stator cooling circuit is embodied on the outside of the stator and the housing of the electrical machine in turn surrounds the cooling jacket of the stator on the outside.
  • the rotor cooling circuit has a first cooling channel for guiding a coolant through the rotor with at least one first coolant inlet and at least one first coolant outlet.
  • the rotor cooling circuit preferably has a second cooling channel for guiding the coolant along the heat exchanger, namely the cooling jacket of the stator cooling circuit, the rotor cooling circuit with at least one second coolant inlet and at least one second coolant outlet.
  • the second coolant outlet of the second cooling channel via a first coolant line to the first coolant inlet of the first cooling channel and the first coolant outlet of the first cooling channel via a second coolant line to the second coolant inlet of the second cooling channel fluidly connected.
  • the first cooling channel is formed in a rotor shaft of the rotor and extends at least partially substantially axially through the rotor shaft.
  • axial describes a direction along or parallel to an axis of rotation of the rotor shaft of the rotor
  • radial describes a direction normal to the axis of rotation of the rotor shaft of the rotor.
  • the first coolant outlet preferably has a greater radial distance to the axis of rotation of the rotor shaft of the rotor than the first coolant inlet.
  • the arrangement of the first coolant outlet at a greater radial distance from the axis of rotation than the first coolant inlet establishes a speed-dependent pressure difference and thus a speed-dependent mass flow in the first cooling channel and the second cooling channel.
  • the cooling channels can be designed in all components of the rotor. The shape and size of the cooling channels depends on the required mass flow and the dissipated Heat output.
  • the pressure difference between the first coolant inlet and the first coolant outlet can be determined by the relationship ⁇ * ⁇ 2 . ⁇ . ( ⁇ £ - rj) where «the angular velocity of the rotor, p the density of the coolant used for cooling and% and r A denote the respective radial position of the first coolant inlet and the first coolant outlet.
  • the second cooling channel is formed in the housing of the electric machine.
  • a spiral-shaped collecting geometry is arranged on or in the housing of the electric machine in the region of the first coolant outlet.
  • the spiral collecting geometry converts the kinetic energy of the refrigerant flowing out of the coolant outlet into a pressure increase at the end of the spiral and thus increases the mass flow rate of the closed rotor cooling circuit with the same energy expenditure. Furthermore, a conversion of the rotational energy of the coolant, impressed by the rotation of the rotor shaft of the rotor, takes place in a translatory movement.
  • Fig. 1 is a sectional view of an electrical according to the invention
  • FIG. 2 shows a first perspective view of an electrical machine according to the invention
  • FIG. 3 shows a second perspective view of an electric machine according to the invention
  • FIG. 4 shows a third perspective view of an electrical machine according to the invention
  • Fig. 5 shows a first perspective view of a spiral
  • Fig. 6 shows a second perspective view of a spiral collecting geometry.
  • FIG. 1 shows a sectional view of an exemplary electrical machine 1 according to the invention.
  • the electric machine 1 has a housing 2, a stator 3 and a rotor 4.
  • the stator 3 and the rotor 5 of the electric machine 1 are arranged substantially in the housing 2 of the electric machine 1.
  • the electric machine 1 is designed in internal rotor construction, i. the stator 3 surrounds the rotor 5 on the outside.
  • the electric machine 1 can be operated both as an electric motor and as a generator. However, the features of the cooling of the electric machine 1 described in this document can also be used in differently constructed electrical machines.
  • stator 3 and a rotor 5 Since the structure and function of a stator 3 and a rotor 5 is well known to those skilled in the art, a detailed description of the structure of these components of the electric machine 1 is omitted.
  • the stator 3 of the electric machine 1 can be cooled via a stator cooling circuit.
  • the rotor 5 of the electric machine 1 can be cooled via a rotor cooling circuit.
  • the stator cooling circuit is connected to an external cooling circuit (not shown), which supplies the stator cooling circuit with a cooled coolant.
  • the stator cooling circuit has a cooling jacket 4.
  • the cooling jacket 4 is arranged on the outside of the stator 3, between the stator 3 and the housing 2, and serves primarily to cool the stator 3 of the electric machine 1.
  • the cooling jacket 4 has a plurality of coolant-carrying channels 18. These Kül hl middle leading channels 18 are supplied via the external cooling circuit with coolant.
  • the cooling of the stator 3 takes place via the inside 19 of the cooling jacket 4 of the stator cooling circuit.
  • the rotor cooling circuit is an internal, closed cooling circuit that is filled with a coolant.
  • the coolant of the rotor cooling circuit is not materially coupled with the coolant of the stator cooling circuit.
  • the rotor cooling circuit comprises a first cooling channel 7, a second cooling channel 8, a first coolant line 13, a second coolant line 14 and a heat exchanger 6 (FIGS. 1, 2, 3, 4).
  • the heat exchanger 6 of the rotor cooling circuit is formed by the cooling jacket 4 of the stator cooling circuit.
  • the first cooling channel 7 of the rotor cooling circuit is formed in a rotor shaft 15 of the rotor 5 and, visible in FIG. 1, has a first coolant inlet 9, a first coolant outlet 11 and a further first coolant outlet 11 '.
  • the first coolant outlet 11 and the further first coolant outlet 11 ' have a greater radial distance from a rotation axis 16 of the rotor shaft 15 of the rotor 5 than the first coolant inlet 9.
  • the first coolant inlet 9 is designed centrically to the axis of rotation 16 of the rotor shaft 15.
  • the first coolant inlet 9 of the first cooling channel 7 extends substantially in the axial direction partially through the rotor shaft 15 of the rotor 5.
  • the first cooling channel 7 reverses in the axial direction and the coolant leaves via the two first coolant outflows 1 1, 1 1 'the rotor shaft 15 at the same shaft end 21, where it enters the rotor shaft 15 via the first coolant inlet 9.
  • the first cooling channel 7 can after the reversal point 20 by on a peripheral surface of the rotor shaft 15 substantially axially extending grooves which are sealed to a laminated core 23 of the rotor 5 through a sleeve 22 may be formed (FIG.
  • first cooling channel 7 extends completely through the rotor shaft 15 and has a coolant outlet 11, 11 'at both distal shaft ends is also conceivable.
  • axial describes a direction along or parallel to the axis of rotation 16 of the rotor shaft 15.
  • the second cooling channel 8 of the rotor cooling circuit is formed overall in the housing 2 of the electric machine 1 and, in the embodiment shown in FIG. 1, is divided into three mutually parallel channels, which are in fluid communication with one another.
  • the second cooling channel 8 has a second coolant inlet 10 and a second coolant outlet 12.
  • the first cooling channel 7 is fluidly connected to the second cooling channel 8 via a first coolant line 13 and second via a second coolant line 14 - the second coolant outlet 12 of the second cooling channel 8 is connected to the first coolant inlet 9 of the first via the first coolant line 13 Cooling channel 7 and the first coolant outlet 1 1 of the first cooling channel 7 via a second coolant line 14 to the second coolant inlet 10 of the second cooling channel 8 fluidly connected.
  • the two coolant lines 13, 14 extend in the housing 2 of the electric machine 1.
  • the coolant is conveyed via the first coolant line 13 from the first cooling channel 7 into the second cooling channel 8 within the housing 2 and guided there inside the housing 2 around the cooling jacket 4 of the stator cooling circuit of the stator 3 and cooled.
  • the temperature of the coolant within the stator cooling circuit of the stator 3 is below the temperature level of the coolant within the rotor cooling circuit of the rotor 5. Due to the temperature difference of the two coolant, namely the coolant within the stator cooling circuit and the coolant within the rotor cooling circuit, the cooling jacket 4 functions as 6.

Landscapes

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

Abstract

L'invention concerne un moteur électrique (1) destiné à un véhicule automobile et comprenant un carter (2), un stator (3), le stator (3) pouvant être refroidi par un circuit de refroidissement de stator et le circuit de refroidissement de stator étant raccordé à un circuit de refroidissement externe et présentant une chemise de refroidissement (4) qui est agencée sur le stator (3), et un rotor (5), le rotor pouvant être refroidi par un circuit de refroidissement de rotor, le circuit de refroidissement de rotor étant un circuit de refroidissement fermé interne qui présente un échangeur de chaleur (6), et l'échangeur de chaleur (6) étant formé par la chemise de refroidissement (4) du circuit de refroidissement de stator.
PCT/EP2018/051625 2017-02-27 2018-01-24 Moteur électrique pour véhicule automobile WO2018153598A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017203156.5A DE102017203156A1 (de) 2017-02-27 2017-02-27 Elektrische Maschine für ein Kraftfahrzeug
DE102017203156.5 2017-02-27

Publications (1)

Publication Number Publication Date
WO2018153598A1 true WO2018153598A1 (fr) 2018-08-30

Family

ID=61094469

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/051625 WO2018153598A1 (fr) 2017-02-27 2018-01-24 Moteur électrique pour véhicule automobile

Country Status (2)

Country Link
DE (1) DE102017203156A1 (fr)
WO (1) WO2018153598A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021104970A1 (fr) * 2019-11-29 2021-06-03 Magna powertrain gmbh & co kg Boîtier pour machine électrique et machine électrique le comprenant
CN114243999A (zh) * 2021-12-24 2022-03-25 浙江安美德汽车配件有限公司 一种带有消音环结构的汽车交流发电机及其散热方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315280A1 (de) 1993-05-07 1995-01-05 Siemens Ag Elektrische Maschine
WO2013152473A1 (fr) * 2012-04-10 2013-10-17 General Electric Company Système et procédé de refroidissement d'un moteur électrique
US20140368064A1 (en) 2013-06-13 2014-12-18 Tesla Motors, Inc. Rotor Assembly with Heat Pipe Cooling System
US20150214817A1 (en) * 2014-01-28 2015-07-30 Hyundai Mobis Co., Ltd. Motor having cooling function
US20150280525A1 (en) * 2014-03-27 2015-10-01 Prippel Technologies, Llc Induction motor with transverse liquid cooled rotor and stator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005025857A1 (de) 2005-06-06 2006-12-07 Gebr. Becker Gmbh & Co Kg Radialgebläse
DE102009055273A1 (de) 2009-12-23 2011-06-30 Robert Bosch GmbH, 70469 Elektromaschine
DE102013200105A1 (de) 2012-10-09 2014-04-24 Robert Bosch Gmbh Kühlung für Stirnräume einer geschlossenen elektrischen Maschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315280A1 (de) 1993-05-07 1995-01-05 Siemens Ag Elektrische Maschine
WO2013152473A1 (fr) * 2012-04-10 2013-10-17 General Electric Company Système et procédé de refroidissement d'un moteur électrique
US20140368064A1 (en) 2013-06-13 2014-12-18 Tesla Motors, Inc. Rotor Assembly with Heat Pipe Cooling System
US20150214817A1 (en) * 2014-01-28 2015-07-30 Hyundai Mobis Co., Ltd. Motor having cooling function
US20150280525A1 (en) * 2014-03-27 2015-10-01 Prippel Technologies, Llc Induction motor with transverse liquid cooled rotor and stator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021104970A1 (fr) * 2019-11-29 2021-06-03 Magna powertrain gmbh & co kg Boîtier pour machine électrique et machine électrique le comprenant
CN114243999A (zh) * 2021-12-24 2022-03-25 浙江安美德汽车配件有限公司 一种带有消音环结构的汽车交流发电机及其散热方法
CN114243999B (zh) * 2021-12-24 2023-04-07 浙江安美德汽车配件有限公司 一种带有消音环结构的汽车交流发电机及其散热方法

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Publication number Publication date
DE102017203156A1 (de) 2018-08-30

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