WO2015176704A1 - Chemise de refroidissement à encombrement optimisé pour machine électrique - Google Patents

Chemise de refroidissement à encombrement optimisé pour machine électrique Download PDF

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Publication number
WO2015176704A1
WO2015176704A1 PCT/DE2015/000259 DE2015000259W WO2015176704A1 WO 2015176704 A1 WO2015176704 A1 WO 2015176704A1 DE 2015000259 W DE2015000259 W DE 2015000259W WO 2015176704 A1 WO2015176704 A1 WO 2015176704A1
Authority
WO
WIPO (PCT)
Prior art keywords
cooling jacket
cooling
coolant
jacket
cover
Prior art date
Application number
PCT/DE2015/000259
Other languages
German (de)
English (en)
Inventor
Sébastien HEITZ
Johannes Weis
Willi Ruder
Original Assignee
Schaeffler Technologies AG & 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 Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Priority to CN201580023755.6A priority Critical patent/CN106464071A/zh
Priority to DE112015002363.1T priority patent/DE112015002363A5/de
Publication of WO2015176704A1 publication Critical patent/WO2015176704A1/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
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • 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 invention relates to a cooling jacket for mounting on an outer side of an electrical machine, such as an electric generator or an electric motor, with a cover, which is arranged so spaced from the cooling jacket, that between the cooling jacket and the cover a coolant space is formed for receiving a coolant ,
  • Such a cooling jacket is known from an earlier (not yet published) German patent application of the applicant.
  • a cooling system for an electric, in particular dynamoelectric machine which has a cooling jacket for mounting on an outer circumference of a stator of the dynamoelectric machine and a housing for receiving the stator with the cooling jacket attached thereto.
  • the housing accommodates the stator together with the cooling jacket such that a cavity which can be filled with a liquid coolant medium remains between an outer wall of the cooling jacket and an inner wall of the housing.
  • an inlet opening for the inlet of the cooling medium into an inlet area and an outlet opening for outlet of the cooling medium from an outlet area of the cavity are arranged on the housing.
  • An exemplary application for such a cooling jacket or an electric machine equipped therewith is, for example, in a hybrid module of a modern motor vehicle with hybrid drive, such as a car, a truck or another commercial vehicle.
  • the hybrid drive can be designed, for example, as a so-called micro, mild or full hybrid.
  • Common to these embodiments is that in comparison to conventionally powered vehicles with an internal combustion engine / an internal combustion engine more electrical energy either to power an electrical energy storage device generated by a generator or must be delivered to drive the motor vehicle by an electric motor.
  • comparatively more heat is generated at the electric machine, which is to be dissipated by the cooling medium located in the cooling jacket, for example, to a heat exchanger. In this way, the electric machine is cooled or cooled. Because without heat dissipation or cooling of the electrical machine, if necessary, an overheating-related power reduction of the electrical machine would have to be carried out.
  • the cooling jacket in its circumferential and / or axial direction in any way restricted or its size must be limited, so as to provide additional space for an adjacent component or an adjacent assembly of, for example, the hybrid module.
  • the coolant space formed between the cooling jacket and the cover element or housing is restricted at least locally, in particular in the form of a constriction.
  • this has proven to be disadvantageous for the cooling or cooling of the electrical machine, since locally less or, in the worst case, no coolant can flow or circulate through the coolant space at these restrictions or constrictions.
  • the velocity distribution in the axial direction of the cooling jacket behaves strongly inhomogeneous or uneven, since the coolant must first avoid the bottleneck and then does not flow again in the flow shadow of the constriction on the preferred flow path.
  • the disadvantageous result is a temporary derating of the electric machine caused by control technology, namely a so-called "derating" of the electric machine until the overheated regions of the electric machine have fallen back to an acceptable operating temperature, which can be disadvantageous, for example, for energy efficiency, ride comfort or worst case on the driving safety of the motor vehicle.
  • the object of the present invention is a cooling jacket for an electrical To create a machine in which using structurally simple means as possible, a comparatively efficient cooling can be achieved in the smallest possible space.
  • the cooling jacket in the region of the coolant chamber has at least one projecting in the radial direction of the cooling jacket and extending substantially in the circumferential direction of the cooling jacket cooling fin, which has at least one local fin recess.
  • the cooling jacket has at least one preferably extending in the circumferential direction of the cooling fin, which forms a comparatively large surface for a heat transfer to the coolant.
  • the cooling jacket has at least at this point or position on a local, ie spatially limited cooling fin recess.
  • a local cooling rib recess means that the at least one cooling rib is not formed continuously in a specific or definable, in particular spatially limited area of the cooling jacket, but is excepted or removed in this spatially limited area such that the cooling rib is there in the radial direction less far from the cooling jacket and / or its peripheral surface protrudes as in the non-recessed or recessed areas.
  • the cooling rib can be recessed or removed down to the circumferential surface of the cooling jacket. Additionally or alternatively, the cooling rib in the radial direction of the cooling jacket can also preferably be flattened by a removal of material, so that a still far less projecting cooling rib remains.
  • cooling jacket or an electric machine equipped therewith can also be used or installed where comparatively little (installation) space is available.
  • a conceivable area of use is, for example, an engine compartment of a motor vehicle, in which, due to aggregates or ancillary components of the motor vehicle, comparatively limited space is available.
  • the spatial and / or geometric definition of at least one Cooling rib recess along the cooling jacket circumference can be carried out as a function of neighboring components or neighboring assemblies of the cooling jacket or of an electric machine equipped therewith. Depending on the installation situation and / or neighboring components of the cooling jacket or an electrical machine equipped therewith, two or more cooling rib recesses distributed over the circumference of the cooling jacket may also be provided.
  • the covering element for example in the manner of a housing or housing section, can preferably surround the cooling jacket and in particular also be arranged on it so that the coolant space formed by the cooling jacket and the covering element preferably surrounding it is at least largely fluid-tight.
  • the cover member may be formed and / or arranged such that it bears against the at least one cooling fin, in order to form in this way one or more coolant channels extending in the circumferential direction of the cooling jacket.
  • a suitable coolant for example from the coolant circuit of an internal combustion engine of a motor vehicle, can be introduced.
  • This coolant can circulate within the coolant space, absorb heat emitted by the cooling jacket and deliver it to a heat exchanger arranged outside the coolant space so as to defrost or cool an electric machine equipped with the cooling jacket.
  • This cooling or cooling is carried out by the at least one cooling fin and thus relatively large, umströmbare surface particularly effective.
  • a particularly advantageous effect of the cooling jacket according to the invention is that, despite a local reduction of the outer dimensions of the cooling jacket or the construction space thus claimed, the coolant is not prevented from flowing through the coolant space due to the cooling rib recess or even blocked. In this way, a largely constant flow distribution is maintained even in the comparatively narrowed region of the cooling jacket. Ergo the formation of overheated areas of the electric machine is avoided, which are also referred to in English as hotspots. This means that, on the one hand, effective cooling of the electric machine is achieved and, on the other hand, a relatively large amount of installation space is saved. The resources available are thus used efficiently.
  • Advantageous embodiments of the invention are claimed in the subclaims and are explained in more detail below.
  • the cover has a geometrically adapted to the at least one local fin recess and / or this subsequent shaping.
  • the cover in the region of at least one local fin recess, for example, by a transforming manufacturing process, such as bending, hot / cold forming, deep drawing or forging, or a machining production process, such as milling, to the predetermined by the at least one local fin recess shape or geometry adapted.
  • This geometrical adaptation and / or the consequences of the shaping of the at least one local cooling rib recess can take place in the circumferential direction of the cooling jacket and / or in the axial direction of the cooling jacket or an electrical machine equipped therewith.
  • a cooling jacket with a cover element formed in this way offers a relatively large number of structural design options, for example in a space-limited engine compartment of a motor vehicle or wherever comparatively little installation space is available for an electric machine with a cooling jacket.
  • the cover is a surrounding the stator and / or the cooling jacket attached thereto cover plate.
  • a sheet metal which may be made of a steel or a light metal, for example, can be formed or deformed in a particularly simple manner, so that the adaptation to the geometry of the at least one cooling fin recess can be realized with high accuracy.
  • the cover plate can be positively, positively or materially attached to the cooling jacket and / or the stator or attached to a housing of the electric machine / attached thereto.
  • the cover is a housing, which preferably receives the stator and the cooling jacket attached thereto.
  • the adaptation of the cover to the geometry of the cooling rib recess can be effected in that a corresponding shaping is milled directly into the housing.
  • a further advantageous embodiment variant of the invention provides that the coolant space formed by the at least one local cooling rib recess and the cover element has a height which is largely constant in the axial direction of the cooling jacket. This can for example be achieved in that the cooling fin recess in the axial direction of the cooling jacket homogeneously extending, that is not stepped, is formed. A constant in the axial direction of the cooling jacket height of the coolant chamber can also be achieved by a corresponding shape of the cover. In any case, this has an advantageous effect on the fluid mechanical conditions of a coolant in the coolant space.
  • the at least one local cooling rib recess is stepped approximately in the axial direction and / or radial direction of the cooling jacket.
  • Such a gradation for example, only in the axial direction can be realized in that in different axial sections of the cooling jacket different amounts of material from the at least one cooling fin and / or the cooling jacket peripheral surface recessed or removed or removed.
  • the gradation in the axial direction can be, for example, groove, bead, stair, ramp and / or bag-shaped.
  • marginal Be rich in the recess be chamfered.
  • the cooling fin ends upstream and / or downstream of the at least one cooling fin recess may also be chamfered or flattened.
  • the cooling jacket For a particularly effective heat dissipation, it is advantageous for the cooling jacket to have a plurality of cooling ribs, preferably arranged parallel to one another, with the at least one cooling rib recess extending in the axial direction of the cooling jacket over a plurality of the plurality of cooling ribs. With the number of cooling fins, the effective surface of the cooling jacket increases to dissipate heat to the coolant.
  • the at least one cooling rib recess may extend over one, several or all cooling fins. This can be defined as a function of a component arranged adjacent to the cooling jacket and the space available therewith.
  • the cooling jacket has an inlet opening and / or an outlet opening for introducing and / or discharging the coolant.
  • These can be designed, for example, each in the form of a nozzle.
  • these can be so arranged or positioned on the circumference of the cooling jacket, that the coolant introduced via the inlet opening substantially flows around the entire circumference of the cooling jacket, that covers approximately 360 ° before it is discharged through the outlet opening and, for example, a heat exchanger for heat dissipation is supplied outside.
  • a barrier element may also be arranged between the inlet opening and the outlet opening, so that the flow path of the coolant is positively controlled and is approximately 360 °.
  • the at least one cooling rib recess is positioned as a function of the inlet opening and / or the outlet opening.
  • it may be stipulated as a condition that the at least one cooling rib recess or the local constriction of the outer dimensions of the cooling jacket which can be realized thereby are spaced apart from the inlet opening and / or the outlet opening.
  • This has a positive effect on the flow behavior of the coolant in an inlet region assigned to the inlet opening and in an outlet region assigned to the outlet opening.
  • the at least one local cooling rib recess is formed by means of a metal-cutting manufacturing process, such as milling.
  • the cooling jacket according to the invention can be used particularly advantageously in a hybrid module with an electrical machine of a motor vehicle, which has a stator on which the cooling jacket is fixed in place.
  • the cooling jacket can be pressed or shrunk, for example, for example.
  • the present invention can solve the problem of local space constrictions in the area of the cooling fins of a cooling jacket for an electric machine provided therewith.
  • the possible coolant flow cross-section is homogenized at the circumferential position of the local space narrowing.
  • the coolant cross-section in the axial direction of the cooling jacket is correspondingly uniformly restricted by radial restrictions of the installation space.
  • a cover member may follow the surface of the cooling jacket accordingly. A homogeneous material removal on the cooling jacket over the axial length is not necessary for this purpose.
  • the cover element can be deformed in such a way that a substantially constant gap height in the axial direction and / or in the circumferential direction in the region of the locally limited space narrowing is realized.
  • the coolant is no longer prevented in this area at the flow.
  • the bottleneck or space constriction can be spaced from an inlet and / or outlet for the coolant.
  • FIG. 1 is a perspective view of a partial section of an electrical machine with a cooling jacket arranged thereon, on which no cover element is arranged for better illustration,
  • FIG. 2 shows a cross section through the cooling jacket of FIG. 1 in its axial direction along a section line II-II, with a cover element arranged thereon, and 1 in its circumferential direction along a section line III-III in the axial height of a constriction of the cooling jacket, which is enforced by a cooling rib recess and a geometrically adapted thereto cover member.
  • the electric machine 1 shows in a perspective view a partial section of an electrical machine 1 with a stator 2 shown by way of indication, on the outside of which a space-optimized cooling jacket 3 for cooling or cooling the electric machine 1 is arranged.
  • the electric machine 1 to be cooled is, for example, an electric generator or an electric motor in a hybrid module of a motor vehicle.
  • the cooling jacket 3 has a substantially cylindrically shaped, hollow cooling jacket main body 4, of which only a partial section in the circumferential direction is shown in FIG.
  • the cooling jacket base body 4 is made of a highly thermally conductive metallic material.
  • the cooling jacket main body 4 is circumferentially applied to the stator 2 of the electric machine 1 to be cooled around.
  • the cooling jacket base body 4 is shrunk onto the stator 2 of the electric machine 1 and thus fixed or fixed thereto.
  • a cover 5 is arranged, which is shown in Fig. 1 only partially in the left edge of the picture.
  • the cover 5 is made as a kind of cover sheet of a metallic sheet material.
  • the cover 5 is arranged so that it surrounds the cooling jacket main body 4 circumferentially and is spaced therefrom to form a radial clearance.
  • a coolant chamber 6 is formed between the cooling jacket base body 4 and the cover 5.
  • a coolant for example from a coolant circuit of an internal combustion engine of the motor vehicle, can be supplied to this coolant chamber 6 via an inlet opening (not shown) and discharged via an outlet opening (likewise not shown).
  • the inlet opening and the outlet opening are arranged on the radial circumference of the cooling jacket 3 that the first introduced Coolant substantially around the entire circumference of the cooling jacket 3 flows, so about 360 ° travels in the circumferential direction, before it flows out through the outlet again and possibly flows into a heat exchanger.
  • the cooling jacket 3 has a multiplicity of cooling ribs 7 which protrude in the radial direction of the cooling jacket 3 or perpendicularly from its cooling jacket base body 4, so as to form as large a surface as possible for dissipating the heat of the electrical machine 1 ,
  • the plurality of cooling fins 7 is thus arranged between the cooling jacket base body 4 and the surrounding cover member 5, wherein the cover member is supported in this embodiment on the individual of the plurality of cooling fins 7 adjacent.
  • the plurality of cooling fins 7 extend substantially in the circumferential direction of the cooling jacket 3.
  • the individual of the plurality of cooling fins 7 are arranged distributed parallel to one another and over the axial length of the cooling jacket 3. Since the individual of the plurality of cooling fins 7 are each spaced from each other, coolant channels 8 are formed between them, through which flow the coolant and thus the cooling fins 7 can flow around a large area.
  • the plurality of cooling fins 7 for space optimization or space saving in a partial section in the circumferential direction of the cooling jacket 3 are recessed over the axial length thereof and a cooling rib recess 9 is formed in this way. That is, the circumferentially extending plurality of cooling fins 7 is interrupted locally, that is, in a circumferentially limited portion. In this way, the outer dimensions of the cooling jacket 3 and the electrical machine 1 equipped therewith can be reduced at least in the radial direction of the same. In this way, the claimed installation space of the electric machine 1 can be reduced at least in the area of the cooling rib recess 9.
  • the cooling rib recess 9 is designed so that in this section in the circumferential direction over the axial length of the cooling jacket 3, the plurality of cooling fins 7 down to a circumferential base surface 10 of the cooling jacket base 4 are removed or removed. This is realized by a machining process, which is milling in this embodiment.
  • the local cooling rib recess 9 is also stepped in this embodiment in the axial direction of the cooling jacket 3. As shown in FIG. 1, a first axia- Partial section 11 of the cooling fin recess 9, a first stage, followed by a second axial section 12 as a second, comparatively lower stage. Accordingly, in the second axial section 12, more material is removed or milled off in comparison to the first axial section 11 so as to form the gradation in the axial direction.
  • the second axial section 12 is approximately bead-shaped or groove-shaped with chamfered or flattened or rounded edge regions.
  • Fig. 2 which shows a cross section through the cooling jacket 3 of Fig. 1 in its axial direction along the section line II-II, it can be seen that the cover member 5 in the axial direction of the stepped shape of the cooling fin recess 9 follows.
  • This is achieved by adapting the sheet-metal covering element 5 to the geometry of the cooling rib recess 9 by means of a forming process, such as bending.
  • a forming process such as bending.
  • the radial or peripheral outer dimensions of the entire cooling jacket 3 together with cover 5 locally, namely reduced in the area of the cooling rib recess 9, whereby the cooling jacket 3 and the electrical machine 1 equipped therewith also use in winding, cramped mounting positions.
  • Fig. 3 shows a cross section through the cooling jacket 3 of Fig. 1 in its circumferential direction along the section line III-III in the axial height of the space-optimized constriction, which is formed by the cooling fin recess 9 and adapted to the shaping cover 5. It can be seen that 3 space is saved in this way in the circumferential direction of the cooling jacket. This means that a substantially rectangular depression in the region of the cooling rib recess 9 is thus formed on the cooling jacket 3.
  • cooling jacket 3 according to the invention can be modified in many ways.
  • the cover element 5 is not formed as / from sheet metal, but is a housing in which the stator 2 are received together with the cooling jacket 3 and the cooling jacket main body 4. Furthermore, a plurality of local cooling rib recesses 9 with a geometrically adapted covering element 5 could be distributed over the circumference of the cooling jacket 3.
  • cooling rib recess 9 is not stepped in the axial direction of the cooling jacket, but is designed with an at least substantially constant cutout or material recess. This can be decided or determined depending on the available (installation) space of the electric machine 1.
  • the at least one cooling rib recess 9 can be arranged so as to be spaced over the circumference of the cooling jacket 3. This avoids fluid mechanical disadvantages when introducing and / or discharging the coolant.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

L'invention concerne une chemise de refroidissement destinée à être montée sur un côté extérieur d'une machine électrique, comprenant un élément de recouvrement qui est placé à une certaine distance de la chemise de refroidissement de manière à former un espace destiné à accueillir un fluide réfrigérant entre la chemise de refroidissement et l'élément de recouvrement. La chemise de refroidissement possède, dans la zone de l'espace dédié au fluide réfrigérant, au moins une ailette de refroidissement faisant saillie dans le sens radial de la chemise de refroidissement et s'étendant sensiblement dans le sens circonférentiel de la chemise de refroidissement, la ou les ailettes de refroidissement possédant au moins une échancrure locale. L'invention concerne également un module hybride dans lequel est montée une telle chemise de refroidissement.
PCT/DE2015/000259 2014-05-20 2015-05-19 Chemise de refroidissement à encombrement optimisé pour machine électrique WO2015176704A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201580023755.6A CN106464071A (zh) 2014-05-20 2015-05-19 经结构空间优化的用于电机的冷却套
DE112015002363.1T DE112015002363A5 (de) 2014-05-20 2015-05-19 Bauraumoptimierter Kühlmantel für eine elektrische Maschine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014209573.5 2014-05-20
DE102014209573 2014-05-20

Publications (1)

Publication Number Publication Date
WO2015176704A1 true WO2015176704A1 (fr) 2015-11-26

Family

ID=53442419

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2015/000259 WO2015176704A1 (fr) 2014-05-20 2015-05-19 Chemise de refroidissement à encombrement optimisé pour machine électrique

Country Status (3)

Country Link
CN (1) CN106464071A (fr)
DE (2) DE112015002363A5 (fr)
WO (1) WO2015176704A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016217120A1 (de) 2016-09-08 2018-03-08 Magna powertrain gmbh & co kg Elektrische Maschine mit einer Baueinheit und einem Kühlmantel
US11563354B2 (en) 2020-03-05 2023-01-24 Dana Belgium N.V. Electric motor cooling system and method for operation of said system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE819282C (de) * 1950-04-18 1951-10-31 Oesterreichische Elektroindust Geschlossene, aussenbelueftete elektrische Maschine
JPH0819218A (ja) * 1994-06-28 1996-01-19 Honda Motor Co Ltd 回転電機の冷却構造
WO2013037409A1 (fr) * 2011-09-14 2013-03-21 Schaeffler Technologies AG & Co. KG Moteur électrique d'une transmission hybride, comprenant des sorties de câble sur une surface circonférentielle radiale, et axe électrique d'un entraînement hybride
DE102012008209A1 (de) * 2012-04-21 2013-10-24 Volkswagen Aktiengesellschaft Elektrische Maschine

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
DE19624519A1 (de) * 1996-06-20 1998-01-02 Bosch Gmbh Robert Flüssigkeitskühlung von elektrischen Maschinen
JP3806303B2 (ja) * 2000-12-11 2006-08-09 三菱重工業株式会社 発電機における冷却構造
DE10141693A1 (de) * 2001-08-25 2003-03-06 Bosch Gmbh Robert Elektrische Maschine, insbesondere Generator für Kraftfahrzeuge
US7322103B2 (en) * 2004-06-04 2008-01-29 Deere & Company Method of making a motor/generator cooling jacket
CN103069693B (zh) * 2011-02-18 2014-01-01 本田技研工业株式会社 旋转电机的壳体

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE819282C (de) * 1950-04-18 1951-10-31 Oesterreichische Elektroindust Geschlossene, aussenbelueftete elektrische Maschine
JPH0819218A (ja) * 1994-06-28 1996-01-19 Honda Motor Co Ltd 回転電機の冷却構造
WO2013037409A1 (fr) * 2011-09-14 2013-03-21 Schaeffler Technologies AG & Co. KG Moteur électrique d'une transmission hybride, comprenant des sorties de câble sur une surface circonférentielle radiale, et axe électrique d'un entraînement hybride
DE102012008209A1 (de) * 2012-04-21 2013-10-24 Volkswagen Aktiengesellschaft Elektrische Maschine

Also Published As

Publication number Publication date
DE112015002363A5 (de) 2017-02-23
DE102015006526A1 (de) 2015-11-26
CN106464071A (zh) 2017-02-22

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