WO2023148121A1 - Boîtier pour machine électrique, machine électrique et véhicule à moteur - Google Patents

Boîtier pour machine électrique, machine électrique et véhicule à moteur Download PDF

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Publication number
WO2023148121A1
WO2023148121A1 PCT/EP2023/052142 EP2023052142W WO2023148121A1 WO 2023148121 A1 WO2023148121 A1 WO 2023148121A1 EP 2023052142 W EP2023052142 W EP 2023052142W WO 2023148121 A1 WO2023148121 A1 WO 2023148121A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing part
inner housing
igt
agt
outer housing
Prior art date
Application number
PCT/EP2023/052142
Other languages
German (de)
English (en)
Inventor
Lennart Leopold
Wolfgang Halbmeyer
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 WO2023148121A1 publication Critical patent/WO2023148121A1/fr

Links

Classifications

    • 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

Definitions

  • the invention relates to a housing for an electrical machine, the housing having an inner housing part and an outer housing part placed on the inner housing part.
  • the inner housing part is designed as an aluminum die-cast part.
  • the outer housing part is produced either as a hollow-cylindrical tube or as an extruded profile.
  • a cooling channel is formed between the inner housing part and the outer housing part.
  • the subject matter of the invention is an electrical machine with the housing according to the invention.
  • an object of the invention is a motor vehicle with the electric machine according to the invention.
  • Housings for electrical machines are known in principle. It is also known that a stator can be arranged in a rotationally fixed manner in the housing of the electrical machine. Moreover, it is known that the housing of the electric machine can take on a cooling function. It is a regular endeavor to optimize the electric machine in such a way that the costs of the electric machine can be reduced and/or the cooling effect of the electric machine can be increased.
  • One object of the invention is to provide a housing for an electrical machine that can be produced inexpensively and can bring about an increased cooling effect of the electrical machine.
  • the invention relates to a housing of an electrical machine for accommodating a stator, comprising an inner housing part designed as an aluminum die-cast part, on the outside of which at least one web of a cooling channel is formed, and an outer housing part arranged on the inner housing part, which
  • the outer housing part is arranged media-tight on the inner housing part and covers the cooling channel formed on the outside of the inner housing part, and the outer housing part is seated without a gap on a web outside of the at least one web.
  • a housing of an electrical machine is provided.
  • the housing is set up and/or designed to accommodate a stator of the electrical machine and to fix it in a rotationally fixed manner in the housing.
  • the electrical machine is preferably part of a traction drive in an at least partially electrically powered motor vehicle.
  • the housing has an inner housing part that is manufactured and/or designed as an aluminum die-cast part.
  • a cooling channel, which includes at least one web, is formed on an outside of the inner housing part. The web is thus designed as a projection on the outside of the inner housing part.
  • the outside of the inner housing part is directed outwards in the radial direction.
  • the outside is formed on a side facing away from the stator. Due to the fact that the inner housing part is produced as an aluminum die-cast part, the cooling channel can be formed in one piece with the inner housing part on the outside of the inner housing part in a simple manner. The inner housing part can thus be manufactured in a few work steps and thus inexpensively.
  • An outer housing part is arranged on the inner housing part. In other words, the inner housing part is at least partially encased by the outer housing part.
  • the outer housing part is either as formed as a hollow-cylindrical tube or as an extruded profile.
  • the tube particularly preferably has a circular cross-section.
  • An outer housing part designed in this way is particularly inexpensive and easy to produce, so that the costs of the electrical machine can be reduced.
  • an outer housing part designed as a tube has increased dimensional stability.
  • the outer housing part is arranged media-tight on the inner housing part, so that a closed cooling channel is formed between the inner housing part and the outer housing part.
  • the cooling medium is preferably an oil, a water-glycol mixture, or air. Provision is also made for the outer housing part to be seated without a gap on an outer side of the web of the at least one web. The web outside is directed outwards in the radial direction of the inner housing part.
  • the outer housing part is arranged on the outside of the web of the at least one web in such a way that no gap is formed between the outside of the web of the web and the outer housing part, and thus no cooling medium can flow between the outside of the web and the outer housing part. Due to the gap-free connection of the outer housing part to the inner housing part, a bypass flow between adjacent cooling sections can be avoided, as a result of which the cooling effect of the electrical machine can be increased. In other words, it can be prevented that the cooling medium does not take the direct path between a cooling inlet and a cooling outlet via the bypass opening.
  • the cooling medium can be designed as a water-glycol mixture, which can have an increased cooling effect compared to oil.
  • the choice of materials and design of the inner housing part and/or outer housing part can reduce the costs of the electrical machine.
  • a cooling medium with an increased cooling capacity can be used, as a result of which the cooling effect of the electrical machine can be increased.
  • a tube made of steel or aluminum can be produced particularly cheaply.
  • aluminum has the advantage that contact corrosion between the inner housing part and the outer housing part is reduced in the case of an inner housing part designed as an aluminum die-cast component.
  • this inner lateral surface facing the inner housing part has a plastic coating at least in sections and/or regions in order to prevent contact corrosion with the inner housing part designed as an aluminum die-cast component.
  • the extruded profile is a steel or aluminum profile.
  • the tube is designed as an extruded profile. This has the advantage that the pipe has no longitudinal seam that could represent a weak point.
  • extruded tubes can have a reduced wall thickness, as a result of which the installation space, the weight and/or the costs can be reduced.
  • a tube designed in this way can also have increased dimensional stability. The increased dimensional stability can enable increased media tightness between the inner housing part and the outer housing part. With an aluminum extruded profile as the outer housing part, contact corrosion between the inner housing part and the outer housing part can be prevented.
  • the extruded profile is made of steel, it can be provided that it has a plastic coating on the inner lateral surface at least in sections and/or areas in order to avoid contact corrosion between the inner housing part and the outer housing part.
  • the at least one web of the cooling channel is arranged and/or formed at least in sections in a spiral, helical, meandering, ring-shaped or fin-shaped manner. At least in sections means that a web in a first Section can be formed differently from a web in a second section. It is therefore conceivable that in a first section the web is designed in a spiral shape and in a second section which is preferably directly adjacent to the first section has an annular configuration without a gradient.
  • the cooling channel can be formed accordingly on the outside of the inner housing part. Since the inner housing part is designed as an aluminum die-cast component, the contour of the cooling channel can be formed inexpensively and with increased dimensional accuracy on the outside of the inner housing part. An inner housing part is thus provided which, on the one hand, can be produced inexpensively and, on the other hand, has a cooling channel in order to effectively cool a stator arranged in the housing.
  • the outer housing part is arranged media-tight on the inner housing part.
  • the media-tight connection of the outer housing part to the inner housing part can be manufactured and/or designed in different ways.
  • the outer housing part is thermally shrunk onto the inner housing part.
  • the thermal shrinking can take place in that the outer housing part is heated and/or the inner housing part is cooled.
  • the inner housing part is pushed into the outer housing part and the temperature is regulated back.
  • the outer housing part is then shrunk onto the inner housing part and can be seated without a gap on the outside of the web of the web.
  • sealing element for sealing the cooling channel is formed between the inner housing part and the outer housing part.
  • the sealing element can preferably be designed as an O-ring.
  • sealing via sealing elements can be advantageous in order to enable increased media tightness of the cooling channel to the environment.
  • the cooling channel formed between the inner housing part and the outer housing part is sealed at least in sections by means of an integral connection.
  • the media-tightness of the cooling channel can be increased via the integral connection.
  • the material connection is a welded connection, an adhesive connection or a soldered connection.
  • an adhesive layer which can be thermally activated, is formed and/or applied on the outside of the web. It is also conceivable that the adhesive layer is expandable, ie can experience an increase in volume.
  • the web outside of the web is glued to the inside of the outer housing part.
  • the adhesive layer applied to the web can be activated and/or cured by adding heat.
  • the outer housing part is connected to the inner housing part at least in sections by welding.
  • a fluid-tight seal can be implemented by the integral connection between the outside of the web and the outer housing part.
  • the outer housing part has an inlet connector and an outlet connector.
  • the inlet port and the outlet port are formed in the outer housing part. This requires a local borehole in a wall of the tube or a wall of the extruded part in order to arrange or press in the inlet connector and/or the outlet connector in the outer housing part.
  • the inlet connection piece and the outlet connection piece are arranged at a distance from one another in the longitudinal direction of the outer housing part.
  • the inlet connector and the outlet connector are spaced apart from each other at the respective distal end, based on the longitudinal direction of the housing, on or in the outer housing part. It is thus possible to ensure that the cooling medium flows over the entire length of the housing in the longitudinal direction of the housing.
  • a further development of the invention is that the inlet connector and the outlet connector are offset from one another in the circumferential direction of the outer housing part.
  • the inlet port and the outlet port are not longitudinally aligned. It can thus be ensured that there is not only a flow through the cooling channel in the longitudinal direction, but also at least in sections in the circumferential direction, as a result of which the cooling effect can be increased.
  • an advantageous development of the invention is that an offset in the circumferential direction is greater than 20° and less than 180°, in particular greater than 30° and less than 60°, the limits being included.
  • the cooling channel is preferably embodied in a helical shape. In the larger angular range, the cooling channel is ring-shaped and has no gradient. Thus, a uniform cooling can be achieved in the circumferential direction of the housing over the entire longitudinal direction.
  • the invention in a second aspect, relates to an electrical machine with the housing according to the invention for accommodating a stator.
  • the electrical machine is preferably part of a traction drive of a motor vehicle.
  • the traction drive preferably includes the electric engine, a gearbox, and an inverter. Provision can advantageously be made for the transmission to be arranged between the inverter and the electrical machine.
  • the housing is closed by a wall of the transmission housing on an end face facing the transmission.
  • the invention relates to a motor vehicle with the electric machine according to the invention.
  • FIG. 1 shows a view of an inner housing part of a housing with a stator arranged in the inner housing
  • 2 shows the housing with the second housing part attached to the inner housing part
  • 3 shows a thermal simulation shown in a sectional view with an outer housing part arranged without a gap on the inner housing part
  • 5 shows a motor vehicle with the electric machine.
  • the inner housing part IGT is in the form of a hollow cylinder and has a flange element on a distal end in the longitudinal direction of the inner housing part.
  • a stator ST is arranged in the inner housing part IGT. The stator ST is clamped or mounted in a rotationally fixed manner within the inner housing part IGT with an inner side of the inner housing part IGT directed inwards in the radial direction.
  • a cooling channel KK which includes at least one web SG, is formed on an outside AS of the inner housing part IGT, which is directed outwards in the radial direction of the inner housing part IGT.
  • the web SG is thus designed as a projection on the outside AS of the inner housing part IGT.
  • the inner housing part IGT is manufactured and/or designed as an aluminum die-cast part. Due to the fact that the inner housing part IGT is produced as an aluminum die-cast part, the cooling channel KK can be formed in one piece with the inner housing part IGT on the outside AS of the inner housing part IGT.
  • the inner housing part IGT can thus be manufactured in a few work steps and thus inexpensively.
  • the cooling channel KK is embodied in a helical shape in the present exemplary embodiment.
  • the at least one web SG runs spirally or helically on the outside AS of the inner housing part IGT.
  • a sealing element DE in the form of an O-ring is arranged on the outside AS of the inner housing part IGT at the respective distal end of the inner housing part IGT.
  • FIG. 2 shows the housing GE or inner housing part IGT known from FIG. 1, with an outer housing part AGT being arranged on the inner housing part IGT.
  • the outer housing part AGT encloses the inner housing part IGT at least in sections.
  • the outer housing part AGT is designed as a tube.
  • the tube has a circular ring-shaped cross-section over its entire length, which is also the same over the entire length.
  • An outer housing part AGT designed in this way is particularly inexpensive and easy to produce, so that the costs of the electrical machine EM can be reduced.
  • the outer housing part AGT is arranged media-tight on the inner housing part IGT, so that a closed cooling channel KK is formed between the inner housing part IGT and the outer housing part AGT.
  • the outer housing part AGT is thermally shrunk onto the inner housing part IGT. Due to the fact that the outer housing part AGT is connected to the inner housing part IGT in a media-tight manner, a separate cooling circuit can be implemented at least for this section, which is decoupled from electrical components. In this way, a water-glycol mixture can preferably be used as the cooling medium, which can have an increased cooling effect compared to oil.
  • the choice of materials and design of the inner housing part and/or the outer housing part can reduce the costs of the electrical machine.
  • a cooling medium with an increased cooling capacity can be used, as a result of which the cooling effect of the electrical machine can be increased.
  • An inlet connection ELS and/or an outlet connection ALS is formed in the outer housing part AGT.
  • a Cooling medium are fed to the cooling channel KK.
  • the cooling medium can be discharged from the cooling channel KK via the outlet connection ALS.
  • FIGS. 3 and 4 each show a thermal simulation shown in a sectional view.
  • the outer housing part AGT is arranged without a gap on the inner housing part IGT, in particular without a gap on the outside of the web SAS of the at least one web SG of the cooling channel KK.
  • a bypass flow of the coolant guided in the cooling channel KK in the longitudinal direction of the housing GE can be prevented and/or suppressed.
  • the cooling medium is guided in the circumferential direction or in a helical shape, and can thus absorb the heat from the stator ST. Consequently, the entirety of the stator ST can be better cooled, and the end windings WK formed on the stator ST experience a lower temperature increase. Due to the increased cooling effect, the power of the electrical machine can be increased.
  • FIG 5 shows a motor vehicle KFZ with the electrical machine EM.
  • the electrical machine EM is part of a traction drive in an at least partially electrically driven motor vehicle KFZ.

Landscapes

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

Abstract

L'invention concerne un boîtier (GE) d'une machine électrique (EM) destiné à recevoir un stator (ST), comprenant une partie interne de boîtier (IGT), qui se présente sous la forme d'une pièce moulée sous pression en aluminium et sur le côté extérieur (AS) de laquelle est formée au moins une âme (SG) d'un conduit de refroidissement (KK), et une partie externe de boîtier (AGT), qui est disposée sur la partie interne de boîtier (IGT) et se présente sous la forme d'un tube cylindrique creux ou d'un profilé extrudé, la partie externe de boîtier (AGT) étant disposée de manière étanche sur la partie interne de boîtier (IGT) et recouvrant le conduit de refroidissement (KK) formé sur le côté externe (AS) de la partie interne de boîtier (IGT), et la partie externe de boîtier (AGT) étant placée sans interstice sur le côté externe (SAS) de ladite âme (SG).
PCT/EP2023/052142 2022-02-03 2023-01-30 Boîtier pour machine électrique, machine électrique et véhicule à moteur WO2023148121A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022201163.5 2022-02-03
DE102022201163.5A DE102022201163A1 (de) 2022-02-03 2022-02-03 Gehäuse einer elektrischen Maschine, elektrische Maschine und Kraftfahrzeug

Publications (1)

Publication Number Publication Date
WO2023148121A1 true WO2023148121A1 (fr) 2023-08-10

Family

ID=85150947

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/052142 WO2023148121A1 (fr) 2022-02-03 2023-01-30 Boîtier pour machine électrique, machine électrique et véhicule à moteur

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DE (1) DE102022201163A1 (fr)
WO (1) WO2023148121A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6909210B1 (en) * 2004-02-06 2005-06-21 Emerson Electric Co. Cooling system for dynamoelectric machine
US20050268464A1 (en) * 2004-06-04 2005-12-08 Deere & Company, A Delaware Corporation. Method of making a motor/generator cooling jacket
US20080185924A1 (en) * 2007-02-01 2008-08-07 Honeywell International Inc. Electric motor cooling jacket
US20100001597A1 (en) * 2005-11-02 2010-01-07 Michael Noll Electric Motor
US20140091652A1 (en) * 2012-10-02 2014-04-03 Andrew Dragon Electric machine including a housing having materially integrally formed coolant channels and an outer sleeve
US20140246177A1 (en) * 2013-03-04 2014-09-04 Remy Technologies, Llc Liquid-cooled rotary electric machine having cooling jacket with bi-directional flow
US9948158B2 (en) * 2014-07-28 2018-04-17 Gogoro Inc. Motor cooling systems and devices

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010042259A1 (de) 2010-10-11 2012-04-12 Robert Bosch Gmbh Elektromaschine
DE102013222697A1 (de) 2013-11-08 2015-05-13 Em-Motive Gmbh Elektrische Maschine mit in ein Gehäuse integriertem Kühlkanal

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6909210B1 (en) * 2004-02-06 2005-06-21 Emerson Electric Co. Cooling system for dynamoelectric machine
US20050268464A1 (en) * 2004-06-04 2005-12-08 Deere & Company, A Delaware Corporation. Method of making a motor/generator cooling jacket
US20100001597A1 (en) * 2005-11-02 2010-01-07 Michael Noll Electric Motor
US20080185924A1 (en) * 2007-02-01 2008-08-07 Honeywell International Inc. Electric motor cooling jacket
US20140091652A1 (en) * 2012-10-02 2014-04-03 Andrew Dragon Electric machine including a housing having materially integrally formed coolant channels and an outer sleeve
US20140246177A1 (en) * 2013-03-04 2014-09-04 Remy Technologies, Llc Liquid-cooled rotary electric machine having cooling jacket with bi-directional flow
US9948158B2 (en) * 2014-07-28 2018-04-17 Gogoro Inc. Motor cooling systems and devices

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Publication number Publication date
DE102022201163A1 (de) 2023-08-03

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