EP3931943A1 - Rotating electric machine having an improved annular cooling chamber - Google Patents

Rotating electric machine having an improved annular cooling chamber

Info

Publication number
EP3931943A1
EP3931943A1 EP20713726.6A EP20713726A EP3931943A1 EP 3931943 A1 EP3931943 A1 EP 3931943A1 EP 20713726 A EP20713726 A EP 20713726A EP 3931943 A1 EP3931943 A1 EP 3931943A1
Authority
EP
European Patent Office
Prior art keywords
stator
machine according
annular
cooling chamber
cooling fluid
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.)
Pending
Application number
EP20713726.6A
Other languages
German (de)
French (fr)
Inventor
Ioan Deac
Juan Wang
Hussain Nouri
Guillaume TARDY
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.)
Nidec PSA Emotors SAS
Original Assignee
Nidec PSA Emotors SAS
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 Nidec PSA Emotors SAS filed Critical Nidec PSA Emotors SAS
Publication of EP3931943A1 publication Critical patent/EP3931943A1/en
Pending legal-status Critical Current

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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary 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
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
    • 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
    • H02K9/197—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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • TITLE ROTATING ELECTRIC MACHINE WITH A BEDROOM
  • the invention relates to a rotary electrical machine of the type comprising a housing and a stator received clamped in the housing, as well as a means for cooling the stator.
  • a rotating electrical machine such as a high-power electric motor for moving a motor vehicle
  • an electric motor which comprises a stator body made from a stack of blades or magnetic plates in which notches are provided for receiving the stator winding.
  • the stator body has longitudinally oriented channels and a cooling fluid circulates within these channels.
  • An object of the invention is to provide a rotating electrical machine, the stator of which is mounted tight in the housing between two bearings which does not have the above drawbacks.
  • a rotary electric machine comprising a housing comprising first and second clamping bearings and an internal face, a stator comprising a stator body mounted clamped between the first and second clamping bearings and having an outer face extending opposite the inner face together delimiting an annular cooling chamber surrounding the stator body, the stator body comprising a longitudinal stack of stator sheets, each stator sheet having a core annular having an outer circumference and at least two radially centrifugal protuberances projecting from the outer circumference of the annular core, into the annular cooling chamber, and diametrically opposed to each other, the stator plates of the longitudinal stack being identical and two adjacent stator sheets of the longitudinal stack being angularly offset t relative to each other so that their respective growths do not extend across each other.
  • the rotary electric machine according to the invention has at least one of the following technical characteristics
  • Each protuberance has first and second faces connecting the outer circumference of the annular core to a radially outer face forming an apex of the protuberance in question, at least one of the first and second faces is tangent to the outer circumference;
  • Each stator sheet of the stack is furthermore mounted tight in the annular cooling chamber, the protuberances bearing on the internal face of the casing; the protuberances comprise a radially outer face forming an apex of the protuberance considered, the radially outer face being in surface contact with the inner face of the casing body;
  • the machine comprises means for supplying cooling fluid to the annular cooling chamber;
  • the cooling fluid supply means are positioned in the upper part of the casing
  • the machine comprises means for discharging cooling fluid from the annular cooling chamber
  • the cooling fluid discharge means are positioned in the lower part of the casing.
  • the cooling fluid discharge means include a recovery tank.
  • the coolant can be a gas, for example air, or a liquid, for example water or oil.
  • the cooling fluid supply means can be uniformly distributed over a width of the annular cooling chamber, for example in a longitudinal direction of the rotating electrical machine. Such an arrangement can allow a uniform distribution of the cooling fluid in the annular chamber.
  • FIG. 1 is a schematic sectional view of a rotating electrical machine according to one embodiment of the invention.
  • FIG. 2 is a three-dimensional sectional view of the machine of FIG. 1;
  • FIG. 3 is a three-dimensional sectional detail view illustrating the arrangement of the stator body of the machine of FIG. 1;
  • FIG. 4 is a side view of a stator sheet for a rotary electrical machine according to the invention;
  • FIG. 5 is a partial sectional view along V-V of the casing and of the stator body of the machine of FIG. 1;
  • FIG. 6 is a detail view of the upper part of FIG. 5.
  • the rotary electric machine 1 comprises a casing 10 formed, here, of a casing cover 12 and a casing body 1 1 comprising a bottom 13.
  • the rotary electric machine 1 according to the invention further comprises, provided within the housing 10, a rotor 50 fixedly mounted on a rotor shaft 51.
  • the rotor shaft 51 is held in the casing 10, free to rotate, by a bearing 52 in the casing cover 12 and by a bearing 53 in the bottom 13 of the casing body 11.
  • the rotary electrical machine 1 comprises a stator 40 fixedly mounted in the housing body 1 1 so as to completely surround the rotor 50.
  • the stator 40 comprises, here, a stator body 41 and a winding received longitudinally in the stator body 41 and having coil heads 42 projecting longitudinally on either side of the stator body 41.
  • the stator body 41 has an outer face 43, here cylindrical.
  • the stator body 41 is held in place, first, between the first 14 and second 15 clamping bearings provided for this purpose in the housing body 11.
  • the first bearing 14 is integral with the casing body 1 1 while the second clamping bearing 15 is attached during an assembly of the rotary electrical machine 1 according to the invention.
  • the stator body 41 is mounted clamped in the housing 10 between the first 14 and second 15 clamping bearings. Positioned between the first 14 and second 15 clamping bearings, the housing 10 has an internal face 17, which is generally cylindrical. The internal face 17, once the assembly of the rotating electrical machine 1 according to the invention has been completed, extends opposite the external face 43 of the stator body 41.
  • the inner 17 and outer 43 faces as well as the first 14 and second 15 clamping bearings define an annular chamber of cooling 21: the inner 17 and outer 43 faces radially delimit the annular cooling chamber 21 and the first 14 and second 15 clamping bearings delimit it longitudinally.
  • the rotary electrical machine 1 comprises an annular cooling chamber 21 which is continuous and which completely surrounds the stator body 41 in a coaxial manner. Longitudinally, the annular cooling chamber 21 extends over almost a width of the stator body 41.
  • the rotary electrical machine 1 So as to feed the annular cooling chamber 21, the rotary electrical machine 1 according to the invention comprises cooling fluid supply means 20.
  • the cooling fluid supply means 20 are positioned in an upper part of the housing 10. It is here in the form of at least one orifice 20 passing through a side wall of the housing body 1 1, the at least one orifice 20 opening into the annular cooling chamber 21 at the level of the internal face 17 of the housing body 1 1.
  • Figure 1 is illustrated a series of three orifices 20 uniformly distributed over a width of the annular cooling chamber 21, in a longitudinal direction of the rotary electrical machine 1 according to the invention.
  • the rotary electrical machine 1 comprises means for discharging cooling fluid 16,30,1 18.
  • the means for discharging cooling fluid are positioned in the lower part of the housing 10, for example diametrically opposite the cooling fluid supply means 20.
  • the cooling fluid discharge means comprise a recovery tank 16 provided with an outlet orifice 30.
  • the recovery tank 16 has a width less than the width of the annular cooling chamber 21 in a longitudinal direction of the rotary electrical machine 1 according to the invention.
  • the rotary electrical machine 1 according to the invention comprises a separation wall 1 17 between the annular cooling chamber 21 and the recovery tank 16. This separation wall 1 17 is here a portion of a cylinder formed from the material. with the crankcase body 1 1. It involves a fluidic communication orifice 1 18 between the annular cooling chamber 21 and the recovery tank 16.
  • the stator body 41 of the rotary electrical machine 1 comprises a longitudinal stack of stator sheets 410 mounted tight not only between the first 14 and second 15 clamping bearings, but also in the annular cooling chamber 21 against the internal face 17 as we will now describe.
  • the stator sheet 410 comprises an annular core 433 having a radially internal circumference 431 which, when mounting the rotary electrical machine 1 according to the invention, surrounds the rotor 50 coaxially, and a radially outer circumference 430 which, when mounting the rotary electrical machine 1 according to the invention, partly defines the outer face 43 of the stator body 41.
  • the stator sheet 410 comprises, here, two radially centrifugal protuberances 432 projecting from the outer circumference 430 of the annular core 433. Each of the protuberances 432 have a radially outer face forming a top 435 of the growth
  • each of the growths 432 has first
  • stator sheet 410 thus produced has a central symmetry of center a geometric center C of the annular core 433.
  • the annular core 433 has through orifices distributed over a circumference. These through orifices, once the stack has been produced, will define notches for receiving the strands of the winding of the stator 40.
  • the stator sheets 410 are stacked so that two adjacent stator sheets 410a and 410b ( Figures 2, 3, 5, 6) are angularly offset with respect to each other so that their respective protuberances do not extend facing each other.
  • the angular offset is of the order of 90 °.
  • the second face 437 of the protuberance 432 of the stator plate 410a is parallel and aligned with the first face 436 of the protuberance 432 of the plate of stator 410b adjacent to the stator sheet 410a. It is the same for the first face 436 of the protuberance 432 of the stator plate 410a which is parallel and aligned with the second face 437 of the protuberance 432 of the stator plate 410b adjacent to the stator plate 410a.
  • the annular cooling chamber 21 is delimited by all of the faces 430,436,437 of the stator sheets 410 forming the outer face 43 of the stator body 41 and the inner face 17 of the housing body 1 January.
  • the annular cooling chamber 21 has circumferential portions of cooling channels 210 parallel to each other over the same angular extent and offset by a thickness of stator sheet 410 over an angular extent. adjacent. Between two adjacent angular extents, a flat being formed by the succession of the first 436 and second 437 faces of the protuberances 432 during stacking, each channel 210 of an angular extent is in fluid communication with the channels 210 of the angular extent adjacent. This allows a distribution of the cooling fluid in the annular cooling chamber 21.
  • the cooling fluid is introduced into the annular cooling chamber 21 via the orifices 20 of the means coolant supply.
  • the cooling fluid is injected under pressure so as to optimally occupy a volume of the annular cooling chamber 21: thus the cooling fluid flows over the entire external face 43 of the stator body 41, in particular along all of the circumferential channels 210 to end up flowing into the recovery tank 16 via the orifice 1 18 and to be extracted from the annular cooling chamber via the outlet orifice 30.
  • the rotary electrical machine 1 allows cooling of the stator body 41, and therefore of the stator 40, by direct contact of the cooling fluid on one face, the outer face 43 here, of said stator body. This makes it possible to have contact over an entire circumference of the stator body 41 so as to have a capture of the calories to be removed optimally over this entire circumference. This capture is all the more effective when the stator body 41 is a longitudinal stack of stator sheets 410 because the cooling fluid is in contact with the elements of the stack by the edge (outer circumference 430, first 436 and second 437 faces of the protuberances 432), these elements having better thermal conductivity in the radial direction than in a longitudinal direction.
  • the rotary electric machine 1 according to the invention which has just been described can be a synchronous or asynchronous machine. It is in particular a machine for traction or propulsion of electric motor vehicles (Battery Electric Vehicle) and / or hybrids (Hybrid Electric Vehicle - Plug-in Hybrid Electric Vehicle), such as individual cars, vans, trucks, buses, coaches.
  • the rotating electric machine 1 according to the invention can be implemented in industrial and / or energy production applications, such as wind turbines, boats, submarines.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The rotating electric machine (1) having a housing comprising first (14) and second (15) clamping bearings and an inner face, a stator comprising a stator body (41) clamped between the first and second clamping bearings and having an outer face extending opposite the inner face together defining an annular cooling chamber (21) surrounding the stator body, the stator body comprising a longitudinal stack of stator packs (410), each of which stator pack comprises an annular core having an outer circumference and at least two radially centrifugal protuberances projecting from the outer circumference of the annular core, in the annular cooling chamber, and diametrically opposite one another, the stator packs of the longitudinal stack being identical and two adjacent stator packs of the longitudinal stack being angularly offset from each other such that the respective protuberances thereof do not extend opposite one other.

Description

DESCRIPTION DESCRIPTION
TITRE : MACHINE ELECTRIQUE TOURNANTE AYANT UNE CHAMBRE TITLE: ROTATING ELECTRIC MACHINE WITH A BEDROOM
ANNULAIRE DE REFROIDISSEMENT AMELIOREE IMPROVED COOLING RATE
DOMAINE TECHNIQUE DE L’INVENTION TECHNICAL FIELD OF THE INVENTION
[0001] La présente invention revendique la priorité de la demande française 1902101 déposée le 28 février 2019 dont le contenu (texte, dessins et revendications) est ici incorporé par référence. The present invention claims the priority of the French application 1902101 filed February 28, 2019, the content of which (text, drawings and claims) is incorporated here by reference.
[0002] L’invention concerne une machine électrique tournante du type comportant un carter et un stator reçu serré dans le carter, ainsi qu’un moyen de refroidissement du stator. The invention relates to a rotary electrical machine of the type comprising a housing and a stator received clamped in the housing, as well as a means for cooling the stator.
ETAT DE LA TECHNIQUE ANTERIEURE STATE OF THE PRIOR ART
[0003]Actuellement, une machine électrique tournante, comme un moteur électrique de forte puissance permettant de mouvoir un véhicule automobile, nécessite des moyens de refroidissement des différents composants qui la constituent et en particulier du stator du fait de la génération de chaleur importante de telles machines tournantes. Dans le document EP 1 109 298, il est décrit un tel moteur électrique qui comporte un corps de stator réalisé à partir d’un empilement de lames ou de plaques magnétiques dans lequel sont aménagées des encoches permettant de recevoir le bobinage du stator. D’autre part, le corps de stator comporte des canaux orientés longitudinalement et un fluide de refroidissement circule au sein de ces canaux. Toutefois, dans certaines configurations de fixation du stator, et en particulier du corps de stator, dans un carter, un tel écoulement longitudinal du fluide de refroidissement au sein de canaux n’est pas compatible : c’est le cas lorsque le corps de stator est monté serré entre deux paliers du carter qui viennent en appui de serrage sur les deux extrémités longitudinales du corps de stator et le refroidissement de la machine électrique tournante devient problématique. Currently, a rotating electrical machine, such as a high-power electric motor for moving a motor vehicle, requires cooling means for the various components that constitute it and in particular the stator due to the high heat generation of such rotating machines. In document EP 1 109 298, there is described such an electric motor which comprises a stator body made from a stack of blades or magnetic plates in which notches are provided for receiving the stator winding. On the other hand, the stator body has longitudinally oriented channels and a cooling fluid circulates within these channels. However, in certain configurations for fixing the stator, and in particular the stator body, in a casing, such a longitudinal flow of the cooling fluid within the channels is not compatible: this is the case when the stator body is mounted clamped between two bearings of the housing which come to rest tightly on the two longitudinal ends of the stator body and the cooling of the rotating electrical machine becomes problematic.
EXPOSE DE L’INVENTION [0004] Un but de l’invention est de fournir une machine électrique tournante dont le stator est monté serré dans le carter entre deux paliers qui ne présente pas les inconvénients précédents. DISCLOSURE OF THE INVENTION An object of the invention is to provide a rotating electrical machine, the stator of which is mounted tight in the housing between two bearings which does not have the above drawbacks.
[0005]A cette fin, il est prévu, selon l’invention, une machine électrique tournante comportant un carter comprenant des premier et deuxième paliers de serrage et une face interne, un stator comprenant un corps de stator monté serré entre les premier et deuxième paliers de serrage et présentant une face externe s’étendant en regard de la face interne délimitant ensemble une chambre annulaire de refroidissement entourant le corps de stator, le corps de stator comportant un empilement longitudinal de tôles de stator dont chaque tôle de stator comporte un noyau annulaire présentant une circonférence externe et au moins deux excroissances radialement centrifuges s’étendant en saillie depuis la circonférence externe du noyau annulaire, dans la chambre annulaire de refroidissement, et diamétralement opposées l’une par rapport à l’autre, les tôles de stator de l’empilement longitudinal étant identiques et deux tôles de stator adjacentes de l’empilement longitudinal étant décalées angulairement l’une par rapport à l’autre de sorte que leurs excroissances respectives ne s’étendent pas l’une en regard de l’autre. To this end, there is provided, according to the invention, a rotary electric machine comprising a housing comprising first and second clamping bearings and an internal face, a stator comprising a stator body mounted clamped between the first and second clamping bearings and having an outer face extending opposite the inner face together delimiting an annular cooling chamber surrounding the stator body, the stator body comprising a longitudinal stack of stator sheets, each stator sheet having a core annular having an outer circumference and at least two radially centrifugal protuberances projecting from the outer circumference of the annular core, into the annular cooling chamber, and diametrically opposed to each other, the stator plates of the longitudinal stack being identical and two adjacent stator sheets of the longitudinal stack being angularly offset t relative to each other so that their respective growths do not extend across each other.
[0006]Avantageusement, mais facultativement, la machine électrique tournante selon l’invention présente au moins l’une des caractéristiques techniques suivantes [0006] Advantageously, but optionally, the rotary electric machine according to the invention has at least one of the following technical characteristics
- chaque excroissance comporte des première et deuxième faces reliant la circonférence externe du noyau annulaire à une face radialement externe formant un sommet de l’excroissance considérée, au moins l’une parmi les première et deuxième faces est tangente à la circonférence externe ; - Each protuberance has first and second faces connecting the outer circumference of the annular core to a radially outer face forming an apex of the protuberance in question, at least one of the first and second faces is tangent to the outer circumference;
- l’autre parmi les première et deuxième faces est tangente à la circonférence externe ; - the other among the first and second faces is tangent to the outer circumference;
- chaque tôle de stator de l’empilement est en outre montée serrée dans la chambre annulaire de refroidissement, les excroissances étant en appui sur la face interne du carter ; - les excroissances comprennent une face radialement externe formant un sommet de l’excroissance considérée, la face radialement externe étant en appui surfacique avec la face interne du corps de carter ; - Each stator sheet of the stack is furthermore mounted tight in the annular cooling chamber, the protuberances bearing on the internal face of the casing; the protuberances comprise a radially outer face forming an apex of the protuberance considered, the radially outer face being in surface contact with the inner face of the casing body;
- la machine comporte des moyens d’alimentation en fluide de refroidissement de la chambre annulaire de refroidissement ; - the machine comprises means for supplying cooling fluid to the annular cooling chamber;
- les moyens d’alimentation en fluide de refroidissement sont positionnés en partie haute du carter ; - the cooling fluid supply means are positioned in the upper part of the casing;
- la machine comporte des moyens d’évacuation en fluide de refroidissement de la chambre annulaire de refroidissement ; - the machine comprises means for discharging cooling fluid from the annular cooling chamber;
- les moyens d’évacuation en fluide de refroidissement sont positionnés en partie basse du carter ; et, - the cooling fluid discharge means are positioned in the lower part of the casing; and,
- les moyens d’évacuation en fluide de refroidissement comprennent un bac de récupération. - The cooling fluid discharge means include a recovery tank.
[0007] Le fluide de refroidissement peut être un gaz, par exemple de l’air, ou un liquide, par exemple de l’eau ou de l’huile. [0007] The coolant can be a gas, for example air, or a liquid, for example water or oil.
[0008] Les moyens d’alimentation en fluide de refroidissement peuvent être uniformément répartis sur une largeur de la chambre annulaire de refroidissement, par exemple selon une direction longitudinale de la machine électrique tournante. Une telle disposition peut permettre une répartition uniforme du fluide de refroidissement dans la chambre annulaire. [0008] The cooling fluid supply means can be uniformly distributed over a width of the annular cooling chamber, for example in a longitudinal direction of the rotating electrical machine. Such an arrangement can allow a uniform distribution of the cooling fluid in the annular chamber.
BREVE DESCRIPTION DES FIGURES BRIEF DESCRIPTION OF THE FIGURES
[0009] D’autres caractéristiques et avantages de l’invention ressortiront à la lecture de la description qui suit d’un mode de réalisation de l’invention. Aux dessins annexés : [0009] Other features and advantages of the invention will become apparent on reading the following description of an embodiment of the invention. In the accompanying drawings:
[Fig. 1 ] est une vue schématique en coupe d’une machine électrique tournante selon un mode de réalisation de l’invention ; [Fig. 1] is a schematic sectional view of a rotating electrical machine according to one embodiment of the invention;
[Fig. 2] est une vue tridimensionnelle en coupe de la machine de la figure 1 ; [Fig. 2] is a three-dimensional sectional view of the machine of FIG. 1;
[Fig. 3] est une vue de détail tridimensionnelle en coupe illustrant l’agencement du corps de stator de la machine de la figure 1 ; [Fig. 4] est une vue de côté d’une tôle de stator pour une machine électrique tournante selon l’invention ; [Fig. 3] is a three-dimensional sectional detail view illustrating the arrangement of the stator body of the machine of FIG. 1; [Fig. 4] is a side view of a stator sheet for a rotary electrical machine according to the invention;
[Fig. 5] est une vue partielle en coupe selon V-V du carter et du corps de stator de la machine de la figure 1 ; et, [Fig. 5] is a partial sectional view along V-V of the casing and of the stator body of the machine of FIG. 1; and,
[Fig. 6] est une vue de détail de la partie haute de la figure 5. [Fig. 6] is a detail view of the upper part of FIG. 5.
DESCRIPTION DETAILLEE D’UN MODE DE REALISATION DETAILED DESCRIPTION OF AN EMBODIMENT
[0010] En référence aux figures 1 et 2, nous allons décrire l’architecture générale d’un mode de réalisation d’une machine électrique tournante 1 selon l’invention. [0010] With reference to Figures 1 and 2, we will describe the general architecture of an embodiment of a rotating electrical machine 1 according to the invention.
[0011] La machine électrique tournante 1 selon l’invention comporte un carter 10 formé, ici, d’un couvercle de carter 12 et d’un corps de carter 1 1 comprenant un fond 13. La machine électrique tournante 1 selon l’invention comporte en outre, ménagé au sein du carter 10, un rotor 50 monté fixe sur un arbre de rotor 51 . L’arbre de rotor 51 est maintenu dans le carter 10, libre à rotation, par un palier 52 dans le couvercle de carter 12 et par un palier 53 dans le fond 13 du corps de carter 1 1 . The rotary electric machine 1 according to the invention comprises a casing 10 formed, here, of a casing cover 12 and a casing body 1 1 comprising a bottom 13. The rotary electric machine 1 according to the invention further comprises, provided within the housing 10, a rotor 50 fixedly mounted on a rotor shaft 51. The rotor shaft 51 is held in the casing 10, free to rotate, by a bearing 52 in the casing cover 12 and by a bearing 53 in the bottom 13 of the casing body 11.
[0012] D’autre part, la machine électrique tournante 1 selon l’invention comporte un stator 40 monté fixe dans le corps de carter 1 1 de sorte à entourer complètement le rotor 50. Le stator 40 comprend, ici, un corps de stator 41 et un bobinage reçu longitudinalement dans le corps de stator 41 et présentant des têtes de bobine 42 s’étendant en saillie longitudinalement de part et d’autre du corps de stator 41 . Le corps de stator 41 comporte une face externe 43, ici cylindrique. Le corps de stator 41 est maintenu en place, en premier lieu, entre des premier 14 et deuxième 15 paliers de serrage ménagés à cet effet dans le corps de carter 1 1 . Par exemple, le premier palier 14 est venu de matière avec le corps de carter 1 1 alors que le deuxième palier de serrage 15 est rapporté lors d’un assemblage de la machine électrique tournante 1 selon l’invention. Ainsi, le corps de stator 41 est monté serré dans le carter 10 entre les premier 14 et deuxième 15 paliers de serrage. Positionnée entre les premier 14 et deuxième 15 paliers de serrage, le carter 10 comporte une face interne 17, globalement cylindrique. La face interne 17, une fois l’assemblage de la machine électrique tournante 1 selon l’invention effectué, s’étend en regard de la face externe 43 du corps de stator 41 . [0013] Une fois le corps de stator 41 monté serré entres les premier 14 et deuxième 15 paliers de serrage dans le carter 10, les faces interne 17 et externe 43 ainsi que les premier 14 et deuxième 15 paliers de serrage délimitent une chambre annulaire de refroidissement 21 : les faces interne 17 et externe 43 délimitent radialement la chambre annulaire de refroidissement 21 et les premier 14 et deuxième 15 paliers de serrage la délimitent longitudinalement. Ainsi la machine électrique tournante 1 selon l’invention comprend une chambre annulaire de refroidissement 21 qui est continue et qui entoure complètement le corps de stator 41 de manière coaxiale. Longitudinalement, la chambre annulaire de refroidissement 21 s’étend sur quasiment une largeur du corps de stator 41 . On the other hand, the rotary electrical machine 1 according to the invention comprises a stator 40 fixedly mounted in the housing body 1 1 so as to completely surround the rotor 50. The stator 40 comprises, here, a stator body 41 and a winding received longitudinally in the stator body 41 and having coil heads 42 projecting longitudinally on either side of the stator body 41. The stator body 41 has an outer face 43, here cylindrical. The stator body 41 is held in place, first, between the first 14 and second 15 clamping bearings provided for this purpose in the housing body 11. For example, the first bearing 14 is integral with the casing body 1 1 while the second clamping bearing 15 is attached during an assembly of the rotary electrical machine 1 according to the invention. Thus, the stator body 41 is mounted clamped in the housing 10 between the first 14 and second 15 clamping bearings. Positioned between the first 14 and second 15 clamping bearings, the housing 10 has an internal face 17, which is generally cylindrical. The internal face 17, once the assembly of the rotating electrical machine 1 according to the invention has been completed, extends opposite the external face 43 of the stator body 41. Once the stator body 41 mounted tightly between the first 14 and second 15 clamping bearings in the housing 10, the inner 17 and outer 43 faces as well as the first 14 and second 15 clamping bearings define an annular chamber of cooling 21: the inner 17 and outer 43 faces radially delimit the annular cooling chamber 21 and the first 14 and second 15 clamping bearings delimit it longitudinally. Thus the rotary electrical machine 1 according to the invention comprises an annular cooling chamber 21 which is continuous and which completely surrounds the stator body 41 in a coaxial manner. Longitudinally, the annular cooling chamber 21 extends over almost a width of the stator body 41.
[0014] De sorte à alimenter la chambre annulaire de refroidissement 21 , la machine électrique tournante 1 selon l’invention comporte des moyens d’alimentation en fluide de refroidissement 20. Ici, les moyens d’alimentation en fluide de refroidissement 20 sont positionnés dans une partie haute du carter 10. Il se présente ici sous la forme d’au moins un orifice 20 traversant une paroi latérale du corps de carter 1 1 , le au moins un orifice 20 débouchant dans la chambre annulaire de refroidissement 21 au niveau de la face interne 17 du corps de carter 1 1 . Sur la figure 1 est illustrée une série de trois orifices 20 uniformément répartis sur une largeur de la chambre annulaire de refroidissement 21 , selon une direction longitudinale de la machine électrique tournante 1 selon l’invention. So as to feed the annular cooling chamber 21, the rotary electrical machine 1 according to the invention comprises cooling fluid supply means 20. Here, the cooling fluid supply means 20 are positioned in an upper part of the housing 10. It is here in the form of at least one orifice 20 passing through a side wall of the housing body 1 1, the at least one orifice 20 opening into the annular cooling chamber 21 at the level of the internal face 17 of the housing body 1 1. In Figure 1 is illustrated a series of three orifices 20 uniformly distributed over a width of the annular cooling chamber 21, in a longitudinal direction of the rotary electrical machine 1 according to the invention.
[0015] D’autre part, la machine électrique tournante 1 selon l’invention comporte des moyens d’évacuation en fluide de refroidissement 16,30,1 18. Ici les moyens d’évacuation en fluide de refroidissement sont positionnés en partie basse du carter 10, par exemple à l’opposé diamétralement des moyens d’alimentation en fluide de refroidissement 20. Les moyens d’évacuation en fluide de refroidissement comprennent un bac de récupération 16 muni d’un orifice de sortie 30. Le bac de récupération 16 présente une largeur inférieure à la largeur de la chambre annulaire de refroidissement 21 selon une direction longitudinale de la machine électrique tournante 1 selon l’invention. D’autre part, la machine électrique tournante 1 selon l’invention comporte une paroi de séparation 1 17 entre la chambre annulaire de refroidissement 21 et le bac de récupération 16. Cette paroi de séparation 1 17 est ici une portion de cylindre venu de matière avec le corps de carter 1 1 . Elle comporte un orifice de communication fluidique 1 18 entre la chambre annulaire de refroidissement 21 et le bac de récupération 16. On the other hand, the rotary electrical machine 1 according to the invention comprises means for discharging cooling fluid 16,30,1 18. Here the means for discharging cooling fluid are positioned in the lower part of the housing 10, for example diametrically opposite the cooling fluid supply means 20. The cooling fluid discharge means comprise a recovery tank 16 provided with an outlet orifice 30. The recovery tank 16 has a width less than the width of the annular cooling chamber 21 in a longitudinal direction of the rotary electrical machine 1 according to the invention. On the other hand, the rotary electrical machine 1 according to the invention comprises a separation wall 1 17 between the annular cooling chamber 21 and the recovery tank 16. This separation wall 1 17 is here a portion of a cylinder formed from the material. with the crankcase body 1 1. It involves a fluidic communication orifice 1 18 between the annular cooling chamber 21 and the recovery tank 16.
[0016] Le corps de stator 41 de la machine électrique tournante 1 selon l’invention comporte un empilement longitudinal de tôles de stator 410 monté serré non seulement entre les premier 14 et deuxième 15 paliers de serrage, mais aussi dans la chambre annulaire de refroidissement 21 à l’encontre de la face interne 17 comme nous allons maintenant le décrire. The stator body 41 of the rotary electrical machine 1 according to the invention comprises a longitudinal stack of stator sheets 410 mounted tight not only between the first 14 and second 15 clamping bearings, but also in the annular cooling chamber 21 against the internal face 17 as we will now describe.
[0017] En référence à la figure 4, la tôle de stator 410 comporte un noyau annulaire 433 présentant une circonférence radialement interne 431 qui, au montage de la machine électrique tournante 1 selon l’invention, vient entourer le rotor 50 de manière coaxiale, et une circonférence radialement externe 430 qui, au montage de la machine électrique tournante 1 selon l’invention, vient définir en partie la face externe 43 du corps de stator 41 . D’autre part, la tôle de stator 410 comporte, ici, deux excroissances 432 radialement centrifuges s’étendant en saillie depuis la circonférence externe 430 du noyau annulaire 433. Chacune des excroissances 432 comportent une face radialement externe formant un sommet 435 de l’excroissanceReferring to Figure 4, the stator sheet 410 comprises an annular core 433 having a radially internal circumference 431 which, when mounting the rotary electrical machine 1 according to the invention, surrounds the rotor 50 coaxially, and a radially outer circumference 430 which, when mounting the rotary electrical machine 1 according to the invention, partly defines the outer face 43 of the stator body 41. On the other hand, the stator sheet 410 comprises, here, two radially centrifugal protuberances 432 projecting from the outer circumference 430 of the annular core 433. Each of the protuberances 432 have a radially outer face forming a top 435 of the growth
432 considérée. De plus, chacune des excroissances 432 comportent des première432 considered. In addition, each of the growths 432 has first
436 et deuxième 437 faces reliant la circonférence externe 430 du noyau annulaire436 and second 437 faces connecting the outer circumference 430 of the annular core
433 au sommet 435 de l’excroissance considérée. Ici, les première 436 et deuxième433 to the top 435 of the considered outgrowth. Here the first 436 and second
437 faces sont tangentes à la circonférence externe 430 du noyau annulaire 433 de la tôle de stator 410. Le sommet 435 de chaque excroissance 432 s’étend circonférentiellement sur un secteur angulaire compris entre 30° et 60°, de préférence entre 45° et 60°, et encore plus préférentiellement de l’ordre de 50°. Il est à noter que la tôle de stator 410 ainsi réalisée présente une symétrie centrale de centre un centre géométrique C du noyau annulaire 433. Ainsi toutes les tôles de stator 410 de l’empilement sont identiques permettant de réduire les coûts de production du corps de stator 41 résultant. 437 faces are tangent to the outer circumference 430 of the annular core 433 of the stator sheet 410. The top 435 of each protuberance 432 extends circumferentially over an angular sector comprised between 30 ° and 60 °, preferably between 45 ° and 60 °. °, and even more preferably of the order of 50 °. It should be noted that the stator sheet 410 thus produced has a central symmetry of center a geometric center C of the annular core 433. Thus all the stator sheets 410 of the stack are identical, making it possible to reduce the production costs of the body of the stack. stator 41 resulting.
[0018] Bien que non représentés, le noyau annulaire 433 comporte des orifices traversants répartis sur une circonférence. Ces orifices traversant, une fois l’empilement réalisé vont définir des encoches de réception des brins du bobinage du stator 40. [0019]Lors d’une réalisation de l’empilement longitudinal pour former le corps de stator, les tôles de stator 410 sont empilées de sorte à ce que deux tôles de stator adjacentes 410a et 410b (figures 2, 3, 5, 6) soient décalées angulairement l’une par rapport à l’autre de sorte que leurs excroissances respectives ne s’étendent pas l’une en regard de l’autre. Ici, illustré, le décalage angulaire et de l’ordre de 90°. Ainsi, comme cela est visible sur les figures 5 et 6, en vue de côté, la deuxième face 437 de l’excroissance 432 de la tôle de stator 410a est parallèle et alignée avec la première face 436 de l’excroissance 432 de la tôle de stator 410b adjacente à la tôle de stator 410a. Il en est de même pour la première face 436 de l’excroissance 432 de la tôle de stator 410a qui est parallèle et alignée avec la deuxième face 437 de l’excroissance 432 de la tôle de stator 410b adjacente à la tôle de stator 410a. Although not shown, the annular core 433 has through orifices distributed over a circumference. These through orifices, once the stack has been produced, will define notches for receiving the strands of the winding of the stator 40. During an embodiment of the longitudinal stack to form the stator body, the stator sheets 410 are stacked so that two adjacent stator sheets 410a and 410b (Figures 2, 3, 5, 6) are angularly offset with respect to each other so that their respective protuberances do not extend facing each other. Here, illustrated, the angular offset is of the order of 90 °. Thus, as can be seen in Figures 5 and 6, in side view, the second face 437 of the protuberance 432 of the stator plate 410a is parallel and aligned with the first face 436 of the protuberance 432 of the plate of stator 410b adjacent to the stator sheet 410a. It is the same for the first face 436 of the protuberance 432 of the stator plate 410a which is parallel and aligned with the second face 437 of the protuberance 432 of the stator plate 410b adjacent to the stator plate 410a.
[0020] Une fois le corps de stator 41 ainsi formé en place dans le carter 10, les sommets 435 de chacune de excroissances 432 de chaque tôle de stator 410 est en appui surfacique sur la face interne 17 du corps de stator 41 permettant ainsi un montage serré de chaque tôle de stator 410 dans le carter 10. Cela renforce le maintien final du corps de stator 41 dans le carter 10. Once the stator body 41 thus formed in place in the housing 10, the vertices 435 of each of the protuberances 432 of each stator sheet 410 is in surface support on the internal face 17 of the stator body 41 thus allowing a tight fitting of each stator sheet 410 in the housing 10. This strengthens the final retention of the stator body 41 in the housing 10.
[0021] D’autre part, la chambre annulaire de refroidissement 21 est délimitée par l’ensemble des faces 430,436,437 des tôles de stator 410 formant la face externe 43 du corps de stator 41 et la face interne 17 du corps de carter 1 1 . Sur toute l’étendue angulaire des excroissances 432, la chambre annulaire de refroidissement 21 présente des portions circonférentielles de canaux de refroidissement 210 parallèles les uns aux autres sur une même étendue angulaire et décalés d’une épaisseur de tôle de stator 410 sur un étendue angulaire adjacente. Entre deux étendues angulaires adjacentes, un méplat étant formé par la succession des premières 436 et deuxièmes 437 faces des excroissances 432 lors de l’empilement, chaque canal 210 d’une étendue angulaire est en communication fluidique avec les canaux 210 de l’étendue angulaire adjacente. Cela permet une répartition du fluide de refroidissement dans la chambre annulaire de refroidissement 21 . On the other hand, the annular cooling chamber 21 is delimited by all of the faces 430,436,437 of the stator sheets 410 forming the outer face 43 of the stator body 41 and the inner face 17 of the housing body 1 January. Over the entire angular extent of the protuberances 432, the annular cooling chamber 21 has circumferential portions of cooling channels 210 parallel to each other over the same angular extent and offset by a thickness of stator sheet 410 over an angular extent. adjacent. Between two adjacent angular extents, a flat being formed by the succession of the first 436 and second 437 faces of the protuberances 432 during stacking, each channel 210 of an angular extent is in fluid communication with the channels 210 of the angular extent adjacent. This allows a distribution of the cooling fluid in the annular cooling chamber 21.
[0022] Lors d’un fonctionnement, le fluide de refroidissement est introduit dans la chambre annulaire de refroidissement 21 via les orifices 20 des moyens d’alimentation en fluide de refroidissement. De préférence, le fluide de refroidissement est injecté sous pression de sorte à occuper de manière optimale un volume de la chambre annulaire de refroidissement 21 : ainsi le fluide de refroidissement s’écoule sur toute la face externe 43 du corps de stator 41 , en particulier le long de l’ensemble des canaux circonférentiels 210 pour finir par s’écouler dans le bac de récupération 16 via l’orifice 1 18 et être extrait de la chambre annulaire de refroidissement par l’orifice de sortie 30. During operation, the cooling fluid is introduced into the annular cooling chamber 21 via the orifices 20 of the means coolant supply. Preferably, the cooling fluid is injected under pressure so as to optimally occupy a volume of the annular cooling chamber 21: thus the cooling fluid flows over the entire external face 43 of the stator body 41, in particular along all of the circumferential channels 210 to end up flowing into the recovery tank 16 via the orifice 1 18 and to be extracted from the annular cooling chamber via the outlet orifice 30.
[0023] La machine électrique tournante 1 selon l’invention qui vient d’être décrite permet de réaliser un refroidissement du corps de stator 41 , et donc du stator 40, par un contact direct du fluide refroidissement sur une face, la face externe 43 ici, dudit corps de stator. Cela permet d’avoir un contact sur toute une circonférence du corps de stator 41 de sorte à avoir une captation des calories à évacuer de manière optimale sur toute cette circonférence. Cette captation est d’autant plus efficace que le corps de stator 41 est un empilement longitudinal de tôles de stator 410 car le fluide de refroidissement est en contact avec les éléments de l’empilement par la tranche (circonférence externe 430, premières 436 et de deuxième 437 faces des excroissances 432), ces éléments présentant une meilleure conductivité thermique dans le sens radial que dans un sens longitudinal. The rotary electrical machine 1 according to the invention which has just been described allows cooling of the stator body 41, and therefore of the stator 40, by direct contact of the cooling fluid on one face, the outer face 43 here, of said stator body. This makes it possible to have contact over an entire circumference of the stator body 41 so as to have a capture of the calories to be removed optimally over this entire circumference. This capture is all the more effective when the stator body 41 is a longitudinal stack of stator sheets 410 because the cooling fluid is in contact with the elements of the stack by the edge (outer circumference 430, first 436 and second 437 faces of the protuberances 432), these elements having better thermal conductivity in the radial direction than in a longitudinal direction.
[0024] La machine électrique tournante 1 selon l’invention qui vient d’être décrite peut être une machine synchrone ou asynchrone. Elle est notamment une machine de traction ou de propulsion de véhicules automobiles électriques (Battery Electric Vehicle) et/ou hybrides (Hybrid Electric Vehicle - Plug-in Hybrid Electric Vehicle), telles que voitures individuelles, camionnettes, camions, bus, cars. La machine électrique tournante 1 selon l’invention peut être mise en œuvre dans des applications industrielles et/ou de production d’énergie, telles qu’éolienne, bateau, sous-marin. [0024] The rotary electric machine 1 according to the invention which has just been described can be a synchronous or asynchronous machine. It is in particular a machine for traction or propulsion of electric motor vehicles (Battery Electric Vehicle) and / or hybrids (Hybrid Electric Vehicle - Plug-in Hybrid Electric Vehicle), such as individual cars, vans, trucks, buses, coaches. The rotating electric machine 1 according to the invention can be implemented in industrial and / or energy production applications, such as wind turbines, boats, submarines.
[0025] Bien entendu, il est possible d’apporter à l’invention de nombreuses modifications sans pour autant sortir du cadre de celle-ci. [0025] Of course, it is possible to make numerous modifications to the invention without departing from the scope thereof.

Claims

REVENDICATIONS
1. Machine électrique tournante (1 ) comportant un carter (10) comprenant des premier (14) et deuxième (15) paliers de serrage et une face interne (17), un stator (40) comprenant un corps de stator (41 ) monté serré entre les premier et deuxième paliers de serrage et présentant une face externe (43) s’étendant en regard de la face interne délimitant ensemble une chambre annulaire de refroidissement (21 ) entourant le corps de stator, le corps de stator comportant un empilement longitudinal de tôles de stator (410,410a, 410b) dont chaque tôle de stator comporte un noyau annulaire (433) présentant une circonférence externe (430) et au moins deux excroissances (432) radialement centrifuges s’étendant en saillie depuis la circonférence externe du noyau annulaire, dans la chambre annulaire de refroidissement, et diamétralement opposées l’une par rapport à l’autre, caractérisée en ce que les tôles de stator de l’empilement longitudinal sont identiques et en ce que deux tôles de stator adjacentes de l’empilement longitudinal sont décalées angulairement l’une par rapport à l’autre de sorte que leurs excroissances respectives ne s’étendent pas l’une en regard de l’autre. 1. Rotating electric machine (1) comprising a housing (10) comprising first (14) and second (15) clamping bearings and an internal face (17), a stator (40) comprising a stator body (41) mounted clamped between the first and second clamping bearings and having an outer face (43) extending opposite the inner face together delimiting an annular cooling chamber (21) surrounding the stator body, the stator body comprising a longitudinal stack stator sheets (410,410a, 410b) each stator sheet having an annular core (433) having an outer circumference (430) and at least two radially centrifugal protuberances (432) projecting from the outer circumference of the core annular, in the annular cooling chamber, and diametrically opposed to each other, characterized in that the stator sheets of the longitudinal stack are identical and in that two adjacent stator sheets The ends of the longitudinal stack are angularly offset from one another so that their respective protuberances do not extend out opposite each other.
2. Machine selon la revendication 1 , caractérisée en ce que chaque excroissance comporte des première (436) et deuxième (437) faces reliant la circonférence externe du noyau annulaire à une face radialement externe formant un sommet (435) de l’excroissance considérée, au moins l’une parmi les première et deuxième faces est tangente à la circonférence externe. 2. Machine according to claim 1, characterized in that each protuberance comprises first (436) and second (437) faces connecting the outer circumference of the annular core to a radially outer face forming an apex (435) of the protuberance considered, at least one of the first and second faces is tangent to the outer circumference.
3. Machine selon la revendication 2, caractérisée en ce que l’autre parmi les première et deuxième faces est tangente à la circonférence externe. 3. Machine according to claim 2, characterized in that the other of the first and second faces is tangent to the outer circumference.
4. Machine selon l’une des revendications 1 à 3, caractérisée en ce que chaque tôle de stator de l’empilement est en outre montée serrée dans la chambre annulaire de refroidissement, les excroissances étant en appui sur la face interne du carter. 4. Machine according to one of claims 1 to 3, characterized in that each stator sheet of the stack is further mounted tightly in the annular cooling chamber, the protuberances bearing on the internal face of the housing.
5. Machine selon la revendication 4, caractérisée en ce que les excroissances comprennent une face radialement externe formant un sommet (435) de l’excroissance considérée, la face radialement externe étant en appui surfacique avec la face interne du corps de carter. 5. Machine according to claim 4, characterized in that the protuberances comprise a radially outer face forming an apex (435) of the protuberance considered, the radially outer face being in surface contact with the inner face of the casing body.
6. Machine selon l’une des revendications 1 à 5, caractérisée en ce qu’elle comporte des moyens d’alimentation (20) en fluide de refroidissement de la chambre annulaire de refroidissement. 6. Machine according to one of claims 1 to 5, characterized in that it comprises supply means (20) with cooling fluid to the annular cooling chamber.
7. Machine selon la revendication 6, caractérisée en ce que les moyens d’alimentation en fluide de refroidissement sont positionnés en partie haute du carter. 7. Machine according to claim 6, characterized in that the cooling fluid supply means are positioned in the upper part of the housing.
8. Machine selon l’une des revendications 1 à 7, caractérisée en ce qu’elle comporte des moyens d’évacuation (1 18,16,30) en fluide de refroidissement de la chambre annulaire de refroidissement. 8. Machine according to one of claims 1 to 7, characterized in that it comprises discharge means (1 18,16,30) of cooling fluid from the annular cooling chamber.
9. Machine selon la revendication 8, caractérisée en ce que les moyens d’évacuation en fluide de refroidissement sont positionnés en partie basse du carter. 9. Machine according to claim 8, characterized in that the cooling fluid discharge means are positioned in the lower part of the housing.
10. Machine selon la revendication 8 ou 9, caractérisée en ce que les moyens d’évacuation en fluide de refroidissement comprennent un bac de récupération (16). 10. Machine according to claim 8 or 9, characterized in that the cooling fluid discharge means comprise a recovery tank (16).
11. Machine selon l’une quelconque des revendications 1 à 10, le fluide de refroidissement étant un liquide, notamment de l’huile. 11. Machine according to any one of claims 1 to 10, the cooling fluid being a liquid, in particular oil.
12. Machine selon l’une quelconque des revendications 1 à 1 1 , les moyens d’alimentation en fluide de refroidissement étant uniformément répartis sur une largeur de la chambre annulaire de refroidissement (21 ), selon une direction longitudinale de la machine électrique tournante (1 ). 12. Machine according to any one of claims 1-1 1, the cooling fluid supply means being uniformly distributed over a width of the annular cooling chamber (21), in a longitudinal direction of the rotary electrical machine ( 1).
EP20713726.6A 2019-02-28 2020-02-25 Rotating electric machine having an improved annular cooling chamber Pending EP3931943A1 (en)

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PCT/FR2020/050365 WO2020174182A1 (en) 2019-02-28 2020-02-25 Rotating electric machine having an improved annular cooling chamber

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US20220131427A1 (en) 2022-04-28

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