WO2018046523A1 - Machine électrique comprenant une unité modulaire et une chemise de refroidissement - Google Patents

Machine électrique comprenant une unité modulaire et une chemise de refroidissement Download PDF

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Publication number
WO2018046523A1
WO2018046523A1 PCT/EP2017/072310 EP2017072310W WO2018046523A1 WO 2018046523 A1 WO2018046523 A1 WO 2018046523A1 EP 2017072310 W EP2017072310 W EP 2017072310W WO 2018046523 A1 WO2018046523 A1 WO 2018046523A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling jacket
recess
cooling
electrical machine
machine according
Prior art date
Application number
PCT/EP2017/072310
Other languages
German (de)
English (en)
Inventor
Erich COSIC
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 WO2018046523A1 publication Critical patent/WO2018046523A1/fr

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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

Definitions

  • the present invention relates to an electrical machine having a structural unit and a cooling jacket surrounding the structural unit at least in sections.
  • the assembly may in particular comprise a stator and a rotatably mounted rotor in the stator (electric motor).
  • the operational waste heat of the machine must be removed as efficiently and reliably as possible.
  • the cooling jacket is provided which surrounds the unit in sections, in particular circumferentially.
  • the connection between the cooling jacket and the electric machine has proved problematic.
  • the connection must be particularly reliable and robust, i. especially insensitive to temperature variations and mechanical stresses (e.g., operational vibration).
  • the connection must be such that waste heat can be removed as efficiently as possible.
  • the cooling jacket with the electric machine, in particular with the assembly should be in the best possible thermally conductive contact.
  • a large contact surface can have a particularly favorable effect on the efficiency of the heat conduction.
  • the simultaneous fulfillment of both requirements - robust connection and good thermal conductivity - represents a special challenge.
  • the cooling jacket can be frictionally connected to the unit by means of interference fit. Although the stated requirements can then be met to a certain extent, the cooling jacket must be made relatively thick be so that it does not come to cracks in the cooling jacket at low temperatures and the cooling jacket is still stable and reliable connected to the unit at high temperatures.
  • a thick-walled cooling jacket leads to a larger design of the electric machine and to a reduced heat dissipation efficiency.
  • the size of the entire electrical machine, ie inclusive cooling jacket given, so that the use of the thick-walled cooling jacket undesirably limits the maximum size of the electrical machine, such as the rotor diameter, and consequently the achievable power density.
  • cooling channels in the form of corrugated sheets are welded directly onto the laminated stator core.
  • the cooling jacket consists of a metal jacket and from the cooling channels formed by pipes or corrugated metal which are interrupted by longitudinal ribs. End is the construction completed by end shields.
  • cooling jackets which form a gap as a closed jacket, are arranged in the cooling fins.
  • the cooling fins are designed such that they have a recess in which rests the outer covering of the cooling jacket on the inner cooling jacket.
  • the cooling jacket of the machine according to the invention has on its outer side at least one recess. Further, the cooling jacket in the region of the recess with a voltage applied to the inside of the cooling jacket component of the assembly, in particular cohesively connected.
  • the cooling jacket in the region of the depression can be provided with any means, e.g. Screws to be connected to the component of the assembly.
  • a cohesive connection is provided.
  • the cooling jacket can be reliably sealing against coolant flowing along the cooling jacket, in particular coolant liquids.
  • the connection may be a welded connection, in particular a friction stir welding connection.
  • the assembly may comprise a stator and a rotor, ie the essential parts of an electric motor, which heat up during operation and must be cooled accordingly.
  • the component of the structural unit which bears against the inside of the cooling jacket and is connected to the cooling jacket in the region of the depression, can in particular be an element or a section of the stator. This can rest in sections flat on the inside of the cooling jacket.
  • the cooling of the electric machine can thus be accomplished particularly well.
  • the recess of the cooling jacket is thinner than outside this area.
  • a cohesive connection provided in this thinner area can have particularly favorable properties, since, for example, it is ensured that a weld extends sufficiently far into the component resting against the cooling jacket, without an excessively large heat input being required.
  • the cooling jacket is made thinner in the region of the depression does not mean that the cooling jacket per se is made thick.
  • the cooling jacket can have a thinner wall than with the conventionally used press fit, in which, moreover, the thickness of the cooling jacket must be determined consuming with regard to the press fit.
  • a comparatively thin-walled cooling jacket can be used without any problem, which improves both the achievable power density (for example, by a larger rotor diameter) and the heat dissipation, and the mechanical stresses due to temperature fluctuations are reduced.
  • the cooling jacket is preferably connected to the component in the region of the depression by friction stir welding.
  • the precisely defined spatial extent of the connection and the comparatively low heat input are advantageous.
  • other welding methods may also be used.
  • the recess is preferably adapted so that a welded connection with the desired properties can be formed without problems.
  • the cohesive connection can be carried out continuously, in sections or even selectively.
  • the cooling jacket may for example be made in one piece by means of pressure or continuous casting. Alternatively or additionally, the cooling jacket can be made by milling. Advantageous embodiments of the invention are apparent from the drawings, the description and the dependent claims.
  • the recess extends substantially in the axial direction of the cooling jacket.
  • the recess may extend axially parallel and e.g. to be a long-necked
  • the requirements for the stability and robustness of the connection between the cooling jacket and the component as well as a large contact surface can be met in this way particularly well.
  • a compound extending in the axial direction is well suited to reliably absorb the forces occurring during operation between the component and the cooling jacket connected to it.
  • the recess may extend more than 50%, preferably more than 75% or even substantially completely over the axial length of the cooling jacket, in order to minimize the partial loading of the connection.
  • Axial end portions of the cooling jacket may be free from the recess.
  • connection preferably extends corresponding to the recess, i.
  • the size of the recess can be adapted to the dimensions of the cohesive connection.
  • the recess or the cohesive connection need not necessarily extend only in the axial direction, for example in the direction of the longitudinal axis of the electrical machine.
  • the cooling jacket has a symmetrical cross-sectional shape.
  • the cooling jacket is formed substantially hollow cylindrical.
  • the thickness or thickness of the cooling jacket in the region of the depression - substantially continuously or in sections - is substantially constant. The recess can thus be easily manufactured, for example by means of a milling process.
  • the material connection produced, for example, by means of friction stir welding does not have to be arranged exactly, at least with regard to the thickness of the cooling jacket in the depression.
  • the connection with respect to the voltage applied to the inside of the cooling jacket component is not provided only at a well-defined location, the position of the adhesive connection within the well can be varied without problems, which reduces the requirements of the manufacturing process.
  • the recess may have a substantially rectangular cross-section.
  • the depression defining surfaces are preferably smooth.
  • a concave shape can also be provided for the depression, in which case the thickness of the cooling jacket in the region of the depression can vary.
  • a complementary formed to the recess insert is arranged in the recess.
  • Such an insert may close the recess and cover the area of the connection so as to make it e.g. to protect against external influences, in particular against contact with coolant liquid.
  • the insert may generally be positively and / or non-positively, in particular cohesively connected to the cooling jacket.
  • the insert may be firmly connected to the cooling jacket, for example by welding, gluing or Terminals.
  • a seal of the recess to prevent ingress of liquids and / or dirt can be realized in the recess.
  • the insert may be loosely inserted into the recess or be connected by positive engagement with the cooling jacket.
  • the insert can also be held in the depression by a jacket surrounding the cooling jacket.
  • the recess may be rounded at least at one axial end.
  • the insert formed complementary to the depression can thereby be easily, i. without tilting, be inserted into the recess.
  • the insert terminates substantially flush with the outside of the cooling jacket.
  • the insert thus offers no special attack surface for dirt.
  • a coolant liquid flow in the region of the insert without significant friction losses.
  • the cooling jacket has at least one outer circumferential cooling rib, which is interrupted in the region of the depression.
  • the insert has at least one cooling rib which connects the interrupted cooling rib of the cooling jacket "with itself", i.
  • the cooling rib of the insert bridges the interruption of the cooling rib of the cooling jacket.
  • a respective cooling rib can serve to delimit cooling channels through which a coolant liquid is passed.
  • the cooling fins can also be provided exclusively to increase the surface of the cooling jacket.
  • the cooling jacket has at least two adjacent cooling ribs which circulate on the outside and which are each interrupted in the region of the depression.
  • the insert part can have at least one cooling rib, which connects the two adjacent cooling ribs to one another.
  • the cooling rib of the insert can therefore the adjacent cooling fins of the Bridge the cooling jacket at an angle over the recess or the insert part. In this way, cooling channels can be easily connected to each other. An elaborate production of thread-like arranged around the cooling jacket around cooling fins is thus not necessary to lead a coolant flow several times circumferentially along the cooling jacket.
  • Fig. 1 is a cooling jacket for an electrical machine with an outside
  • Fig. 2 shows an insert for the recess of the cooling jacket of Fig. 1;
  • Fig. 3 shows the cooling jacket of Fig. 1 with the insert part of Fig. 2;
  • Fig. 4 shows another insert for the recess of the cooling jacket of Fig. 1;
  • Fig. 5 shows the cooling jacket of Fig. 1 with the insert part of Fig. 4.
  • a cooling jacket 10 which has a hollow cylindrical basic shape with symmetrical cross-section.
  • the cooling jacket 10 is intended to be connected to a not shown component of a structural unit of an electrical machine (not shown).
  • the component may be a stator (not shown) of an electric motor, which is arranged inside the cooling jacket 10 and at least partially bears against the inside of the cooling jacket 10.
  • the cooling jacket 10 is therefore preferably at least partially se formed inside complementary to the stator. To optimize the heat dissipation, it is applied over a large area to the stator.
  • the cooling jacket 10 On its outside, the cooling jacket 10 has an elongated recess 12 which extends in the axial direction, i. axially parallel to the longitudinal axis of the shell 10 extends.
  • the recess 12 extends substantially completely over the axial length of the jacket 10 and is rounded at the axial ends in each case.
  • the recess 12 has a substantially rectangular cross-section, wherein the thickness of the shell 10 in the region of the recess 12 is smaller.
  • the recess 12 is not a passage or an opening of the cooling jacket 10.
  • a material connection with a voltage applied to the inside of the jacket 10 component of a structural unit can be produced.
  • a friction stir welding process is used for this purpose.
  • the cooling jacket 10 also has on its outer side a plurality of circumferential cooling fins 14 in the circumferential direction; in the concrete example four equidistantly spaced cooling fins 14.
  • the cooling fins 14 serve e.g. for limiting cooling channels, in which cooling liquid is passed for cooling the electrical machine.
  • Fig. 2 shows a complementary to the recess 12 of the shell 10 of FIG. 1 formed insert 16a.
  • the insert 16a has on its upper side - analogous to the cooling ribs 14 of the shell 10 - four equidistant from each other arranged cooling fins 18.
  • the insert 16a is disposed in the recess 12 or inserted into the recess 12, so that the state shown in Fig. 3 results.
  • a respective cooling rib 18 of the insert 16a now bridges a respective cooling rib 14 of the jacket 10, so that the cooling ribs 14 are closed in each case completely circumferentially.
  • the insert 16a can thus compensate for the "interruption" of the outer contour of the shell 10 caused by the recess 12, the cohesive connection being covered and protected on the outside.
  • the insert 16a may be e.g. be integrally connected to the cooling jacket 10 at its axial ends, or completely along its outer contour. As mentioned above, but other types of connections are conceivable.
  • FIG. 4 shows a further insert part 16b which, as an alternative to the insert part 16a of FIG. 2, can be arranged in the recess 12.
  • the insert 16b has four equidistantly spaced and inclined to the longitudinal axis of the insert 16b extending cooling fins 20.
  • the cooling fins 20 have at their ends a respective kink, which is followed by a respective end section which runs perpendicular to the longitudinal axis of the insert 16b. Due to the cooling ribs 20, the insert 16b is adapted to connect two neighboring cooling ribs 14 of the jacket 10 bridging each other (see FIG. 5). In this way, coolant liquid can be diverted from a limited by two cooling fins 14 channel to an adjacent channel.

Landscapes

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

Abstract

L'invention concerne une machine électrique comprenant une unité modulaire et une chemise de refroidissement qui entoure au moins une partie de l'unité modulaire et qui présente au moins un évidement sur sa face extérieure, ladite chemise de refroidissement étant raccordée, notamment par lliaison de matière, à un composant de l'unité modulaire adjacent à la face intérieure de la chemise de refroidissement, dans la zone de l'évidement.
PCT/EP2017/072310 2016-09-08 2017-09-06 Machine électrique comprenant une unité modulaire et une chemise de refroidissement WO2018046523A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016217120.8A DE102016217120A1 (de) 2016-09-08 2016-09-08 Elektrische Maschine mit einer Baueinheit und einem Kühlmantel
DE102016217120.8 2016-09-08

Publications (1)

Publication Number Publication Date
WO2018046523A1 true WO2018046523A1 (fr) 2018-03-15

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PCT/EP2017/072310 WO2018046523A1 (fr) 2016-09-08 2017-09-06 Machine électrique comprenant une unité modulaire et une chemise de refroidissement

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DE (1) DE102016217120A1 (fr)
WO (1) WO2018046523A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3996255B1 (fr) * 2020-11-04 2024-06-12 Etel S.A. Boitier de refroidissement de stator pour un stator de moteur électrique rotatif
US20220352782A1 (en) * 2021-04-30 2022-11-03 Dana Tm4 Inc. Electric axle with direct rotor and head spray cooling
DE102021208273A1 (de) 2021-07-30 2023-02-02 Valeo Eautomotive Germany Gmbh Stator-Gehäuse-Anordnung für eine elektrische Maschine mit verbesserter Verschweißung

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1746614U (de) 1956-02-16 1957-06-13 Bbc Brown Boveri & Cie Elektrische maschine gekapselter bauart.
DE102007055910A1 (de) * 2007-10-25 2009-04-30 Baumüller Nürnberg GmbH Kühlmantel insbesondere für elektrische Maschinen sowie Herstellungsverfahren dafür
JP2010178598A (ja) 2009-02-02 2010-08-12 Mazda Motor Corp 回転電機
DE102015006904A1 (de) 2014-05-20 2015-11-26 Schaeffler Technologies AG & Co. KG Robuster, bauraumoptimierter Kühlmantel für eine elektrische Maschine
DE102015006348A1 (de) 2014-05-20 2015-11-26 Schaeffler Technologies AG & Co. KG Bauraumoptimierter Kühlmantel mit halterungsaufweisendem Trennsteg für eine elektrische Maschine
DE102015006526A1 (de) 2014-05-20 2015-11-26 Schaeffler Technologies AG & Co. KG Bauraumoptimierter Kühlmantel für eine elektrische Maschine
EP3059028A1 (fr) * 2015-02-20 2016-08-24 Siemens Aktiengesellschaft Pièce forgée dotée d'une zone de fonctionnement en métal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102684360B (zh) 2012-05-23 2014-07-09 东方电气集团东风电机有限公司 电动大巴车专用驱动电机水道

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1746614U (de) 1956-02-16 1957-06-13 Bbc Brown Boveri & Cie Elektrische maschine gekapselter bauart.
DE102007055910A1 (de) * 2007-10-25 2009-04-30 Baumüller Nürnberg GmbH Kühlmantel insbesondere für elektrische Maschinen sowie Herstellungsverfahren dafür
JP2010178598A (ja) 2009-02-02 2010-08-12 Mazda Motor Corp 回転電機
DE102015006904A1 (de) 2014-05-20 2015-11-26 Schaeffler Technologies AG & Co. KG Robuster, bauraumoptimierter Kühlmantel für eine elektrische Maschine
DE102015006348A1 (de) 2014-05-20 2015-11-26 Schaeffler Technologies AG & Co. KG Bauraumoptimierter Kühlmantel mit halterungsaufweisendem Trennsteg für eine elektrische Maschine
DE102015006526A1 (de) 2014-05-20 2015-11-26 Schaeffler Technologies AG & Co. KG Bauraumoptimierter Kühlmantel für eine elektrische Maschine
EP3059028A1 (fr) * 2015-02-20 2016-08-24 Siemens Aktiengesellschaft Pièce forgée dotée d'une zone de fonctionnement en métal

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