EP2277254A2 - Machine électrique comportant un dispositif de refroidissement - Google Patents

Machine électrique comportant un dispositif de refroidissement

Info

Publication number
EP2277254A2
EP2277254A2 EP09741971A EP09741971A EP2277254A2 EP 2277254 A2 EP2277254 A2 EP 2277254A2 EP 09741971 A EP09741971 A EP 09741971A EP 09741971 A EP09741971 A EP 09741971A EP 2277254 A2 EP2277254 A2 EP 2277254A2
Authority
EP
European Patent Office
Prior art keywords
medium
cooling
rotor
cooling medium
electrical machine
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP09741971A
Other languages
German (de)
English (en)
Inventor
Paul Esse
Douglas-Brent Hackett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2277254A2 publication Critical patent/EP2277254A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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

Definitions

  • the invention relates to an electrical machine with a housing in which a rotor is rotatably arranged and in which a coolant having a cooling device is provided.
  • the invention further relates to a method for cooling the electric machine.
  • oil cooling systems for electrical machines which are designed as a nozzle cooling or as a sump cooling.
  • a nozzle cooling acting as a cooling medium oil is distributed through nozzles inside the housing.
  • a sump cooling an oil sump is formed in the interior of the housing of the electric machine, in which the rotor dives at least in sections and so entrains oil in a rotation of the oil sump for the purpose of cooling. The oil wets the rotor and parts of the electric machine.
  • a disadvantage here is that, for a sufficient cooling effect in the case of a nozzle cooling, a larger number of nozzles must be arranged in the interior of the housing of the electric machine in order to effect the most effective and effective introduction of the oil. Such nozzles are expensive to assemble and take up space.
  • a sump cooling is disadvantageous that only a good rotor wetting takes place when it runs in the oil sump, so that substantially only an outer circumferential surface of the rotor is sufficiently cooled.
  • the object of the invention is to provide an electrical machine with improved cooling, in particular a sufficient contribution and to effect uniform distribution of cooling medium within the electric machine.
  • an electric machine with a housing in which a rotor is rotatably arranged and in which a coolant having a cooling device is provided.
  • at least one medium swirling element which rotates with the rotor and deviates from a rotationally symmetrical shape, is arranged in the housing.
  • Electric machines that are required to perform well such as in electric motors of electric vehicles or hybrid vehicles, or generally in hybrid applications, require active cooling as described above.
  • a medium swirling element is arranged in the housing, which rotates with the rotor.
  • the medium Verwirungsungselement has such a design that it deviates from a rotationally symmetrical shape.
  • the medium swirling element is a rotor balancing disk.
  • Rotor balancing discs are known in the art, they serve to balance imbalances, such as those in the manufacture of the rotor, in particular by application of electrical windings, arise and are undesirable at higher speeds compensate. They are regularly applied to the end of the rotor on the shaft and rotatably connected to the rotor.
  • the rotor balancing disc hereby obtains a double use, namely on the one hand as a means for balancing the rotor and on the other hand as medium Verwirungsungselement.
  • the medium Verwirungsungselement on at least one of its end faces and / or its lateral surfaces on at least one swirl projection and / or a Verwirbelungsverianaung for the cooling medium has either a swirling protrusion and / or a swirling depression.
  • a swirling projection is an element emerging from the medium swirling element, while a swirling depression is introduced into the swirling element. This results in irregularities of outer surfaces, namely the end faces and / or the lateral surfaces, which impart a pulse in the rotation upon impact of cooling medium molecules and lead to a movement, ultimately to a turbulence of the cooling medium within the housing.
  • the swirling projection and / or the swirling recess are formed in the same material as the medium swirling element. This means that about the Verwirbelungsverianaung introduced into the material of the swirling element, in particular from this by, for example, by machining processes or by way of a casting or other manufacturing process excluded.
  • Verwirbelungsvorsprung is attached to the geometry of the swirling element of the same material, for example, molded or molded.
  • the Verwirbelungsvorsprung in the course of the production of medium Verwirungsungselement mitausge gives the following: - A -
  • the Verwirbelungsvorsprung and / or the Verwirbelungsverianaung is formed as a separate part on Mediumverwirungsungselement.
  • the training is not only uniform in material, but also possible in material diversity.
  • designed as replacement parts especially changeable, swirling projections or Verwirbelungsverianaonne provide that can be maintained or exchanged at high mileages of the electric machine.
  • swirl brush it is meant that a plurality of swirl protrusions are grouped together so as to protrude from the medium swirling element, similar to a brush or forming a brush. Details show the figures.
  • Verwirbelungsverianaung formed radially extending. This means that the Verwirbelungsvorsprung or the Verwirbelungsverianaung runs in the direction of the radial extension, so for example, the Verwirbelungsvorsprung beyond an outer periphery of the medium Verwirungsungs instituten, so for example in the form of the aforementioned brush, which extends extending in the radial direction, or that the Verwirbelungsvertiefung example in a Front side of the medium Verwirungsungselement extending in the radial direction, for example, starting from the rotor shaft, is designed to extend radially.
  • At least one swirling recess is formed as an open-edged recess extending over a partial circumference of the medium swirling element.
  • the swirling recess runs circumferentially, wherein it is designed as an open-edged recess which extends over a partial circumference of the medium swirling element, that is to say with a deviation from the rotationally symmetrical shaping.
  • recesses are introduced into the outer circumference of the medium swirling element, that is to say, for example, the rotor balancing disk already mentioned, which effect the impingement of cooling medium and cause it to swirl.
  • the cooling device a
  • Cooling medium sump device and / or a cooling medium injection device is. Both cooling medium sump devices and cooling medium injection devices are known. In the
  • Cooling medium sump device the rotor runs in a sump of cooling medium, which is arranged in the interior of the housing, while in the cooling medium injection device, the cooling medium is sprayed via injection nozzles into the interior of the housing and in this case components of the electrical machine, in particular the rotor acted upon.
  • cooling medium sump device and cooling medium injection device are also conceivable.
  • At least one Mediumsprüh- and / or Mediumnebelflinder is arranged, which has a guide for collected cooling medium.
  • the Mediumsprüh- and / or medium mist catcher serves to catch sprayed or atomized cooling medium and to hold and / or to guide in a desired manner, including a guide for the cooling medium collected by him is provided.
  • the guide is directed to the medium Verwirungsungselement. Collected cooling medium is therefore passed directly back to the medium Verwirungsungselement and re-whirled from there.
  • a particularly effective and effective feedback and refluidization of the cooling medium can be achieved so that it does not have to run lengthily from the walls of the housing, for example into the cooling medium sump, but is immediately available for the new turbulence.
  • the cooling medium is a cooling lubricant, in particular an oil.
  • a cooling lubricant in particular an oil.
  • the lubrication in particular also the already mentioned rotor shaft. Due to the turbulence of the cooling lubricant, this can be done in a particularly advantageous manner in the housing of the electric machine distribute and thus reaches places that are difficult to reach by lubricant or from which lubricant is easily discharged again. In this way it is very advantageous to prevent a lack of lubrication, even under unfavorable operating conditions.
  • a method for cooling an electric machine is proposed, in particular, as described above, inside its housing, in which a rotor is rotatably arranged and in which a cooling medium having a cooling device is provided.
  • the cooling takes place by swirling the cooling medium by means of at least one medium swirling element, which rotates with the rotor and deviates from a rotationally symmetrical shape.
  • the cooling takes place here by swirling the cooling medium, for which purpose the medium swirling element is provided.
  • Figure 1 shows an electrical machine in longitudinal section
  • FIG. 2 shows the electric machine with turbulence elements and medium spray and / or medium mist catcher
  • FIG. 3 shows a design of the medium swirling element with swirl projections and depressions
  • FIG. 4 shows a swirling element with swirling protrusions designed as swirling brushes
  • FIG. 5 shows the same turbulence element in a different view
  • FIG. 6 shows a swirling element with swirling depressions formed as edge-open recesses of a partial circumference
  • FIG. 7 shows the same medium swirling element in a different view.
  • Figure 1 shows an electric machine 1 with a coil 2 having stator 3, wherein the coils 2 are located within a housing 4 of the electric machine and having an air gap 5 between them a rotor 6 which is rotatable in the housing 4 on a rotor shaft 7 stored between the coil 2.
  • the rotor 6 has at its end sides 8 in each case a rotor balancing disk 9, which is non-rotatably connected to the rotor 6 and / or the rotor shaft 7 and thus rotates with the rotor 6.
  • a cooling medium sump 10 is provided on the underside within the housing 4, in which cooling medium 1 1 accumulates due to gravity.
  • the rotor 6 immersed in the cooling medium 1 1 in the cooling medium sump 10 at least in sections and tears this in a rotation with it, so that it contributes to a spill of cooling medium 11 within the housing 4
  • the cooling medium 1 1 drains from the housing walls 12 and collects again in the cooling medium sump 10.
  • the housing 4 has in each case end in its interior medium nebulizer 13, which collects spilled cooling medium 11 and directed by training as a guide 14 targeted to the rotary balancing disks 9, the when Medium Verwirungsungsimplantation 15 are formed.
  • a targeted admission of Mediumverwirbelungsetti 15 is achieved so that an immediate turbulence of the trapped and on the
  • Coolor would have to be spun again.
  • a cooling device 18 is formed for the electric machine, which is designed as a cooling medium sump device 19.
  • FIG. 2 again shows the electric machine 1 with the housing 4 and the rotor 6, to the end of which the rotor balancing disks 9 designed as medium swirling elements 15 are non-rotatably connected.
  • the electric machine 1 in this case has a cooling medium injection device 20, is injected at the cooling medium 1 1 via spray nozzles 21 in the housing 4, to which a cooling medium circuit 22 is provided with a cooling medium reservoir 23 and a cooling medium 11 promoting cooling medium pump 24.
  • the cooling medium pump 24 downstream of the spray nozzles 21 are arranged downstream, with cooling medium 1 1 from the interior of the housing 4 via a drain point 25 in the coolant reservoir 23 back.
  • the spray nozzles 21 act on a plurality of jets of cooling medium 1 1 or via ademediumsprühfnatureer 26
  • FIG. 3 shows a rotor balancing disk 9 designed as a medium swirling element 15 for the above-described electrical machine 1 (not shown here) in a perspective view.
  • This has a central recess 28 for the passage of the rotor shaft 7, not shown here.
  • the medium swirling element 15 Verwirbelungsveriana 30, which are introduced in the form of open-edged recesses 31 in the end face 27, such that they extend from the central recess 28 at radially extending up to the lateral surface 32 of the medium Verwirungsungselements 15.
  • the open-edged recesses 31 are in this case as four equally angularly spaced edge open
  • the Verwirbelungsveriana 30 are remote from the rotor 6, not shown here and facing the housing 4, not shown here.
  • FIG. 4 shows another embodiment of the medium swirling element 15 in which swirling protrusions 33 in the form of swirling brushes 34 are formed. These are preferably formed as replaceable Verwirbelungsbürsten 34 and made of a different material than the medium Verwirungsungselement 15, so that they can be replaced, for example, when worn.
  • FIG. 5 shows the same medium swirling element 15, viewed on its lateral surface 32, from which the swirling brushes 34, namely the swirling protrusions 33, protrude.
  • FIG. 6 shows another embodiment of the medium Verwirungsungselements 15, namely the rotor balancing disk 9, in cross-section, wherein Verwirbelungsveriana 30 in the form of open-edged recesses 31 are formed over a partial circumference 35 of the medium Verwirbelungselement 15 interrupting the continuous lateral surface 32.
  • FIG. 7 shows the same medium swirling element 15 with the open-edged recesses 31 as swirling recesses 30, which extend over the partial circumference 35 of the medium swirling element 15, namely its lateral surface 32, and are formed diametrically opposite one another.

Landscapes

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

Abstract

L'invention concerne une machine électrique (1) comportant un boîtier (4) dans lequel un rotor (6) est logé rotatif et un dispositif de refroidissement (18) comportant un agent de refroidissement (11) est monté. Selon l'invention, le boîtier (4) loge au moins un élément tourbillonnaire d'agent (15) qui tourne avec le rotor et dont la conception ne présente pas de symétrie de rotation. L'invention porte également sur un procédé de refroidissement d'une machine électrique (1).
EP09741971A 2008-05-07 2009-04-21 Machine électrique comportant un dispositif de refroidissement Withdrawn EP2277254A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008001618A DE102008001618A1 (de) 2008-05-07 2008-05-07 Elektrische Maschine mit einer Kühleinrichtung
PCT/EP2009/054690 WO2009135753A2 (fr) 2008-05-07 2009-04-21 Machine électrique comportant un dispositif de refroidissement

Publications (1)

Publication Number Publication Date
EP2277254A2 true EP2277254A2 (fr) 2011-01-26

Family

ID=41134590

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09741971A Withdrawn EP2277254A2 (fr) 2008-05-07 2009-04-21 Machine électrique comportant un dispositif de refroidissement

Country Status (3)

Country Link
EP (1) EP2277254A2 (fr)
DE (1) DE102008001618A1 (fr)
WO (1) WO2009135753A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5188593B2 (ja) 2011-03-31 2013-04-24 株式会社小松製作所 発電電動機の冷却構造及び発電電動機
CN106160344B (zh) * 2014-04-11 2018-06-15 上海从瑞投资管理有限公司 纯电动汽车的电动机的工作方法
DE102014221667A1 (de) * 2014-10-24 2016-04-28 Zf Friedrichshafen Ag Hybridantriebsanordnung eines Kraftfahrzeuges
DE102015216020A1 (de) * 2015-08-21 2017-02-23 Siemens Aktiengesellschaft Antriebsvorrichtung
DE102019135895A1 (de) 2019-12-30 2021-08-19 Seg Automotive Germany Gmbh Elektrische Maschine
AT525415B1 (de) * 2021-09-10 2024-09-15 Miba Emobility Gmbh Elektrische Maschine und Antriebseinheit mit einer solchen elektrischen Maschine

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3217193A (en) * 1963-03-08 1965-11-09 Worthington Corp Liquid cooled motor arrangement
GB1354247A (en) * 1972-05-30 1974-06-05 Gen Electric Dynamoelectric machine
DE7735181U1 (de) * 1977-11-16 1978-02-23 Siemens Ag, 1000 Berlin Und 8000 Muenchen Wechselstrommotor mit einem fluessigkeitsgekuehlten staender
JPS6416238A (en) * 1987-07-09 1989-01-19 Fanuc Ltd Method of cooling motor
FR2622064A1 (fr) * 1987-10-16 1989-04-21 Normandie Moteurs Electr Machine electrique a refroidissement par fluide liquide
EP0882322A1 (fr) * 1996-12-06 1998-12-09 Voith Turbo GmbH & Co. KG Procede pour refroidir un moteur a courant alternatif, notamment moteur a flux transversal et moteur a courant alternatif, notamment moteur a flux transversal
DE102004049795A1 (de) * 2004-04-08 2005-11-10 Deere & Company, Moline Kühlvorrichtung für eine mit einer Kühlflüssigkeit kühlbaren elektrischen Maschine
JP2007181282A (ja) * 2005-12-27 2007-07-12 Toshiba Corp 回転電機

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009135753A3 *

Also Published As

Publication number Publication date
WO2009135753A3 (fr) 2010-02-25
DE102008001618A1 (de) 2009-11-12
WO2009135753A2 (fr) 2009-11-12

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