Rotating electric machine housing and rotating electric machine
The housing design with dual channels and a cooling chamber effectively cools the rotor shaft and stator, addressing heating issues and enhancing power output in rotating electrical machines.
Patent Information
- Application Number
- FR2022001369
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2022-02-16
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2042-02-16
AI Technical Summary
Existing rotating electrical machine housings fail to effectively cool the rotor shaft and rotor, leading to potential demagnetization of permanent magnets and excessive heating, while also increasing machine length due to thick walls and channels for cooling fluid passage.
A housing design with axially separated seals and dual cooling fluid channels, along with a cooling chamber, ensures efficient cooling of the rotor shaft, stator, and end flange, using seals to prevent leakage and optimize fluid circulation.
The design enhances cooling efficiency, preventing demagnetization and excessive heating, reduces machine length, and improves power output by optimizing cooling fluid circulation and distribution.
Smart Images
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Abstract
Description
Title of the invention: Rotating electric machine housing and rotating electric machine
[0001] The invention relates to a casing for a rotating electrical machine and to a rotating electrical machine comprising such a casing.
[0002] It is known from application FR 2717639 Al a housing for a rotating electrical machine having an axis of rotation (A), the housing comprising: - a first lateral wall located at a first axial end of the housing and having a first opening suitable for receiving a shaft of the rotating electrical machine, - a second internal wall, distinct from the first side wall, forming with the first side wall a channel for a cooling fluid and having a second opening suitable for receiving the shaft of the rotating electrical machine.
[0003] This type of housing allows the axial end of the housing to be cooled with a cooling fluid. However, such a housing does not allow the rotor, in particular the rotor shaft, to be cooled.
[0004] It is known from application WO 2012 / 024778 Al a housing for a rotating electrical machine having a rotation axis, the housing comprising: - a first lateral wall located at a first axial end of the housing, - a second internal wall, distinct from the first lateral wall, forming with the first lateral wall a channel for a cooling fluid and having a second opening suitable for receiving a shaft of the rotating electrical machine, the channel being suitable for opening into a conduit formed in the shaft of the rotating electrical machine.
[0005] This type of housing allows a cooling fluid to be supplied to the shaft of an electrical machine. However, since the first side wall is closed to allow the passage of the cooling fluid between the channel and the shaft without leakage to the outside of the rotating electrical machine, the length of the rotating electrical machine is significant. This is because the thickness of the first wall and the thickness of the space for the passage of the cooling fluid are added to the length of the shaft.
[0006] Furthermore, this type of housing does not allow the fluid to be discharged after passing through the channel formed in the shaft. In WO 2012 / 024778 A1, the cooling fluid is discharged into a pump turbine after passing through the channel formed in the shaft. This type of fluid discharge is poorly suited to rotating electrical machines other than pumps.
[0007] The present invention aims to resolve all or part of these drawbacks.
[0008] The invention relates to a housing for a rotating electrical machine having an axis of rotation, the housing comprising:
[0009] - a first lateral wall located at a first axial end of the housing and presenting a first opening suitable for receiving a shaft of the rotating electrical machine, the first opening comprising a first joint surface,
[0010] - a first seal mounted in the first sealing surface and providing a seal between the first side wall and the shaft of the rotating electrical machine,
[0011] - a second internal wall, distinct from the first lateral wall, forming with the the first side wall having a first channel for a cooling fluid and presenting a second opening suitable for receiving the shaft of the rotating electrical machine, the second opening comprising a second sealing surface,
[0012] - a second seal mounted in the second seal seat and allowing a sealing between the second inner wall and the shaft of the rotating electrical machine,
[0013] the first seal and the second seal being axially separated, a first supply space connected to the first channel and being formed between the first seal and the second seal, the first supply space being suitable for allowing a connection between the first channel and a first inlet of the shaft of the rotating electrical machine for the passage of the cooling fluid.
[0014] Such a housing allows the passage of a cooling fluid into an end flange of the rotating electrical machine, the end flange comprising the first lateral wall and the second inner wall. This passage of cooling fluid improves the cooling of the rotating electrical machine. It is then possible to increase the power of the electrical machine while preventing its destruction by excessive heating. Furthermore, such a housing guides the cooling fluid to the inside of the shaft of the rotating electrical machine. This reduces the heating of the shaft and the rotor. In the case of a permanent magnet rotor, such a reduction in heating, for example, prevents demagnetization of the permanent magnets. Such a housing also limits the heating of a bearing supporting the rotating shaft within the housing.
[0015] According to an additional feature of the invention, the first channel extends from 180° to 360° around the axis of rotation.
[0016] Such an extent of the first channel improves the cooling of the end flange. Such an extent of the first channel also improves the cooling of a bearing supporting the rotating shaft in the housing.
[0017] According to a further feature of the invention, the housing comprises:
[0018] - a second channel formed between the first side wall and the second wall internal, the second channel being distinct from the first channel,
[0019] - a second power supply space connected to the second channel and formed between the first joint and second joint, the second supply space being separate from the first supply space, the second supply space being suitable to allow a connection between the second channel and a second input of the rotating electrical machine shaft for the passage of the cooling fluid.
[0020] Such a housing, comprising a second channel and a second supply space, allows a shaft with a cooling circuit to be supplied with cooling fluid. For example, the cooling fluid enters the shaft's cooling circuit through the first shaft inlet and exits the shaft's cooling circuit through the second shaft inlet. This makes it possible to further improve the shaft's cooling.
[0021] According to a further feature of the invention, the second feeding space is separated from the first feeding space by a separating wall formed in the first side wall or the second internal wall.
[0022] Such a separation makes it possible to promote the passage of the fluid in the cooling circuit of the shaft by limiting the direct passage of the cooling fluid between the first supply space and the second supply space.
[0023] According to a further feature of the invention, the housing comprises:
[0024] - an internal ring suitable for receiving, in particular by press fitting, a stator of the rotating electrical machine,
[0025] - an outer ring radially outside the inner ring and forming with the inner ring a cooling chamber suitable for receiving the cooling fluid.
[0026] Such a cooling chamber makes it possible to improve the cooling of the rotating electrical machine and in particular the cooling of the stator.
[0027] According to a further feature of the invention, the cooling chamber comprises;
[0028] - an inlet suitable for allowing the entry of the cooling fluid into the chamber of cooling,
[0029] - an outlet suitable for allowing the cooling fluid to exit the chamber cooling,
[0030] - a first low wall extending from a first axial end of the chamber cooling at a second axial end of the cooling chamber,
[0031] the inlet and outlet opening on either side of the first wall, the first wall allowing for circumferential circulation of the fluid in the cooling chamber,
[0032] the first channel opening into the cooling chamber at the level of a first connecting section, circumferentially on one side of the first wall, and the second channel opening into the cooling chamber at the level of a second connecting section, circumferentially on a second side of the first wall opposite the first side.
[0033] Such an arrangement, including a first baffle, ensures good circulation of the cooling fluid not only in the cooling chamber but also in the first and second channels, and therefore in the shaft. The baffle limits or prevents direct flow of the cooling fluid from the inlet to the outlet. The cooling of the rotating electrical machine is thus improved. The stator is cooled by the cooling chamber, and the end flange and shaft are cooled in two parallel circuits. Consequently, only a limited quantity of the fluid circulating in the cooling chamber to cool the stator also circulates in the first channel and in the shaft to cool the end flange and shaft.
[0034] According to a further feature of the invention, a first angle, around the axis of rotation, between the inlet and the first side of the first wall is less than 25% of a first angular extent of the cooling chamber between the first side of the first wall and the second side of the first wall around the axis of rotation, and wherein a second angle, around the axis of rotation, between the first connecting section and the first side of the first wall is less than 25% of the first angular extent, and wherein a third angle, around the axis of rotation, between the outlet and the second side of the first wall is less than 25% of the first angular extent, and wherein a fourth angle, around the axis of rotation, between the second connecting section and the second side of the first wall is less than 25% of the first angular extent.
[0035] Such an arrangement, in which the inlet, outlet, first connecting section, and second connecting section are close to the first wall, improves cooling by limiting the volume of dead cooling fluid, i.e., the volume of cooling fluid for which the flow velocity is low. The cooling of the rotating electrical machine is thus more homogeneous.
[0036] According to a further feature of the invention, the cooling chamber comprises;
[0037] - an inlet suitable for allowing the entry of the cooling fluid into the chamber of cooling,
[0038] - an outlet suitable for allowing the cooling fluid to exit the chamber cooling,
[0039] - a second wall extending from a first axial end of the chamber cooling at a second axial end of the cooling chamber,
[0040] - a third wall extending from the first axial end of the chamber cooling at the second axial end of the cooling chamber,
[0041] the second wall and the third wall delimiting a first zone and a second zone of the cooling chamber, the second zone being angularly shorter than the first zone,
[0042] the inlet opening into the first zone and the first channel opening into the first zone at the level of a first connecting section, and
[0043] the outlet opening into the second zone and the second channel opening into the second zone at the level of a second connecting section.
[0044] According to a further feature of the invention, a fifth angle between a first circumferential end of the first zone and the inlet is less than 25% of a second angular extent around the axis of rotation of the first zone and a sixth angle between a second circumferential end of the first zone, opposite the first circumferential end, and the first connecting section is less than 25% of the second angular extent around the axis of rotation of the first zone.
[0045] Such an arrangement, in which the inlet, outlet, first connecting section, and second connecting section are located near the second and third walls, improves cooling by limiting the volume of dead cooling fluid, i.e., the volume of cooling fluid for which the flow velocity is low. The cooling of the rotating electrical machine is thus more homogeneous.
[0046] According to an additional feature of the invention, the angular extent with respect to the axis of rotation of the first zone is between 270° and 355°.
[0047] Such an angular extent for the first zone allows the cooling fluid to circulate over a large part of the circumference of the housing. The cooling of the electrical machine, and in particular the cooling of the stator, is improved.
[0048] According to an additional feature of the invention, the inner ring is formed of material with the second inner wall.
[0049] According to an additional feature of the invention, the housing comprises a second side wall located at a second axial end of the housing.
[0050] According to a further feature of the invention, the second side wall is formed of material with the outer ring.
[0051] According to an additional feature of the invention, the first opening includes a bearing surface adapted to receive a first bearing adapted to support the rotation of the shaft of the rotating electrical machine.
[0052] The invention also relates to a rotating electrical machine comprising:
[0053] - a housing as described above,
[0054] - a stator supported by the housing,
[0055] - a rotor supported in rotation by the housing.
[0056] The invention also relates to an electrical assembly comprising a rotating electrical machine as described above and a power electronic component electrically connected to the stator, the power electronic component being in thermal contact with the first axial end.
[0057] Such thermal contact improves the cooling of the power electronic component. Indeed, a portion of the heat dissipated by the power electronic component is removed by the cooling fluid.
[0058] In all the above, the rotor may comprise any number of pole pairs, for example six or eight pole pairs.
[0059] In all the above, the rotating electrical machine may have a stator having a polyphase electrical winding, for example formed by wires or by conductive bars connected to each other.
[0060] The rotating electrical machine may include a power electronic component suitable for connection to a vehicle's on-board electrical system. This power electronic component includes, for example, an inverter / rectifier that, depending on whether the rotating electrical machine is operating as a motor or a generator, can either load the vehicle's on-board electrical system or be electrically powered from it.
[0061] The invention will be better understood upon reading the following description of non-limiting examples of its implementation and upon examination of the accompanying drawing in which:
[0062] - [Fig. 1] [Fig. 1] represents a partial schematic cross-sectional view of a machine rotating electric motor comprising a housing according to the invention,
[0063] - [Fig.2] [Fig.2] represents a partial schematic cross-sectional view of a housing for a rotating electrical machine according to a second embodiment,
[0064] - [Fig. 3] [Fig. 3] represents a partial schematic view of a machine housing rotating electric motor according to a first embodiment,
[0065] - [Fig.4] [Fig.4] represents a partial schematic view of the machine housing rotating electric of the [Fig.2].
[0066] In all the figures, identical elements or elements performing the same function are identified by the same reference numerals. The following embodiments are examples. Although the description refers to one or more embodiments, this does not necessarily mean that each reference numeral relates to the same embodiment or that the features apply only to a single embodiment. Simple features from different embodiments can also be combined or interchanged to provide other embodiments.
[0067] Ordinal numeral adjectives are used to differentiate features. They do not define the position of a feature. Therefore, for example, a third feature of a product does not mean that the product has a first and / or a second characteristic.
[0068] Figure 1 shows a schematic partial cross-sectional view of a rotating electrical machine 1 having an axis of rotation A. The rotating electrical machine 1 comprises a stator 2 and a rotor 3 in a housing 7. The housing 7 comprises a first side wall 6 located at a first axial end of the housing 7 and a second side wall 5 located at a second axial end of the housing 7 opposite the first axial end of the housing 7. The stator 2 is fixed inside the housing 7. For example, the stator 2 is shrink-fitted inside the housing 7.
[0069] The stator 2 comprises a stator body 9 and a winding 8. The stator body 9 comprises, for example, a stack of magnetic laminations. For example, the winding 8 comprises electrical conductors, an active portion of which passes through slots formed in the stator body 9, and a connecting portion or coil 10 is formed outside the slots. The winding 8 is, for example, a hairpin winding.
[0070] The rotor 3 is, for example, a permanent magnet rotor. The rotor 3 comprises, for example, a rotor body 15 having openings or slots in which permanent magnets 13 are inserted.
[0071] In another embodiment not shown, the rotor includes a rotor winding.
[0072] The rotor 3 is mounted on a shaft 4 with axis of rotation A. For the purposes of the invention, unless otherwise specified, the terms radial and radially mean with respect to the axis of rotation A. For the purposes of the invention, unless otherwise specified, the terms axial, axially, longitudinal and longitudinally mean in the direction of the axis of rotation A.
[0073] The first side wall 6 has a first opening 18 comprising a first seal seat 19. The first seal seat 19 is a surface, for example cylindrical, of the first opening 18 in which a seal can be mounted, for example, by press-fitting. The first side wall 6 may also include a first bearing seat 54 adapted to receive a first bearing 12 adapted to support the rotation of the shaft 4. The second side wall 5 may include a third opening. The third opening may include a second bearing seat 55. The first bearing 12 is, for example, mounted in a first bearing seat 54 formed in the first side wall 6. The second bearing 11 is, for example, mounted in a second bearing seat 55 formed in the second side wall 5.The shaft 4 is thus guided in rotation by the first bearing 12 mounted in the first side wall 6 and a second bearing 11 mounted in the second side wall 5. .
[0074] Tree 4 is, for example, suitable for receiving a training element, for example a pulley or a gear. In the embodiment shown in [Fig. 1], the shaft 4 includes splines 56 adapted to ensure rotational connection with the drive element. In another embodiment of the invention, not shown, rotational connection is ensured, for example, by a keyway or a tapered connection.
[0075] In another embodiment not shown, the shaft 4 is guided in rotation relative to the first side wall 6 and the second side wall 5 by means of other known means of guiding in rotation, for example plain bearings.
[0076] A first seal 20 is mounted in the first seal seat 19. The first seal 20 provides a seal between the first side wall 6 and the shaft 4.
[0077] The housing 7 further comprises a second internal wall 17, separate from the first lateral wall 6. The second internal wall 17 forms with the first lateral wall 6 a first channel 21 for a cooling fluid. The second internal wall 17 has a second opening 22 suitable for receiving the shaft 4 of the rotating electrical machine 1. The second opening includes a second sealing surface 23. The housing 7 also includes a second seal 24 mounted in the second sealing surface 23. The second seal 24 provides a seal between the second internal wall 17 and the shaft 4 of the rotating electrical machine 1.
[0078] The first seal 20 and the second 24 are axially separated. A first supply space 25 connected to the first channel 21 is formed between the first seal 20 and the second seal 24. The first supply space 25 is suitable for allowing a connection between the first channel 21 and a first inlet of the shaft 4 of the rotating electrical machine 1 for the passage of the cooling fluid. The first inlet of the shaft 4 is, in particular, a first radial inlet located on a radially outer surface of the shaft 4.
[0079] The first seal 20 and the second seal 24 are, for example, lip seals.
[0080] In an unrepresented embodiment of the invention, the first channel 21 extends from 180° to 360° around the axis of rotation A.
[0081] In an embodiment of the invention not shown, an electrical assembly comprises the rotating electrical machine 1 and a power electronic component electrically connected to the stator. The power electronic component is, for example, in thermal contact with the first axial end. For the purposes of the invention, thermal contact is direct contact or contact via a solid element, for example, a thermal plate or paste.
[0082] The housing 7 may also include a second feed channel 26 formed between the first side wall 6 and the second inner wall 17. The second channel 26 is separate from the first channel 21. A second feed space 27 connected to the second channel 26 and formed between the first joint 20 and the second joint 24, the second feed space 27 being separate from the first feed space. The second The supply space 27 is suitable for allowing a connection between the second channel 26 and a second inlet of the shaft 4 of the rotating electrical machine 1 for the passage of the cooling fluid. The second inlet of the shaft 4 is, in particular, a second radial inlet located on a radially external surface of the shaft 4.
[0083] The second feed space 27 is for example separated from the first feed space 25 by a separating wall 28 formed in the first lateral wall 6 and / or the second internal wall 17. In the representation shown in [Fig.1], a reduced gap between the separating wall and the shaft, for example less than 0.5mm, preferably less than 0.1mm, allows the separation between the first feed space 25 and the second feed space 27.
[0084] In another embodiment of the invention not shown, the separating wall 28 comprises a third sealing surface. A third seal is, for example, mounted in the third surface. The third seal is, for example, a lip seal.
[0085] The housing 7 may further include an inner ring 29 adapted to receive, in particular by press fitting, the stator 2 of the rotating electrical machine 1. The housing 7 may also include an outer ring 30 radially outside the inner ring 29 and forming with the inner ring 29 a cooling chamber 31 adapted to receive the cooling fluid. The sealing of an axial end of the cooling chamber 31 is, for example, achieved by means of a fourth seal, in particular an O-ring 57, housed in a groove formed on the inner ring 29. The fourth seal is in contact with the inner ring 29 radially on the inside and with the outer ring radially on the outside.
[0086] In another embodiment not shown, the fourth seal is housed in a groove formed on the outer ring.
[0087] The cooling chamber 31 may include an inlet 32 adapted to allow the cooling fluid to enter the cooling chamber 31. The cooling chamber 31 may also include an outlet 33 adapted to allow the cooling fluid to exit the cooling chamber 31. The inlet 32 and the outlet 33 are, for example, fixed to the outer ring 30. In another example, the inlet 32 and the outlet 33 are formed of material within the outer ring 30.
[0088] The inner ring 29 is for example formed of material with the second inner wall 17.
[0089] The second lateral wall 5 is for example formed of material with the outer ring 30.
[0090] A seal between the outer ring 30 and the first side wall 6 is for example achieved by means of a weld 58, in particular a friction stir weld.
[0091] In another embodiment of the invention not shown, a seal between the outer ring 30 and the first side wall 6 is for example achieved by means of a gasket.
[0092] Figure 3 presents a partial schematic view of the housing 7 according to a first embodiment of the invention. To facilitate understanding, the inlet 32 and outlet 33 have been schematically represented in radial projection onto the inner ring 29. In the first embodiment of the invention, a first wall 34 extends from a first axial end 45 of the cooling chamber to a second axial end 46 of the cooling chamber. The inlet 32 and the outlet 33 open on either side of the first wall 34. A wall in the sense of the invention is an element extending radially between the inner ring 29 and the outer ring 30. Such a wall extends radially, for example, over a radial length greater than 70% of a radial distance between the inner ring 29 and the outer ring 30, in particular over a radial length greater than 90% of a radial distance between the inner ring 29 and the outer ring 30.Such a wall includes, for example, a protrusion formed on the inner ring and / or a protrusion formed on the outer ring. In another embodiment not shown, such a wall includes, for example, a piece attached to the inner ring and / or a piece attached to the outer ring. The first wall 34 promotes circumferential circulation of the fluid in the cooling chamber 31. The first channel 21 opens into the cooling chamber at a first connecting section 35, circumferentially to a first side 37 of the first wall 34. The second channel 26 opens into the cooling chamber 31 at a second connecting section 36, circumferentially to a second side 38 of the first wall 34 opposite the first side 37.
[0093] For example, a first angle 39, about the axis of rotation A, between the inlet 32 and the first side 37 of the wall 34 is less than 25% of a first angular extent 41 of the cooling chamber 31 between the first side 37 of the first wall 34 and the second side 38 of the first wall 34 about the axis of rotation A. For example, a second angle 42, about the axis of rotation A, between the first connecting section 35 and the first side 37 of the first wall 34 is less than 25% of the first angular extent 41. For example, a third angle 39, about the axis of rotation A, between the outlet and the second side 38 of the wall 34 is less than 25% of the first angular extent 42. For example, a fourth angle 43, about the axis of rotation A, between the second connecting section 36 and the second side 38 of the first wall 34 is less than 25% of the first angular extent 4L
[0094] A low wall in the sense of the invention extends circumferentially for example over less than 5° in particular over less than 1°.
[0095] Figure 4 represents a partial schematic view of the housing 7 according to a second embodiment of the invention. As in [Fig. 3], to facilitate understanding, the inlet 32 and outlet 33 have been schematically represented in radial projection onto the inner ring 29. In the second embodiment, the cooling chamber 31 comprises two walls:
[0096] - a second wall 44 extending from a first axial end 45 of the chamber cooling 31 to a second axial end 46 of the cooling chamber 31, and
[0097] - a third wall 47 extending from the first axial end 45 of the chamber cooling 31 at the second axial end 46 of the cooling chamber 31.
[0098] The second wall 44 and the third wall 47 delimit a first zone 48 and a second zone 49 of the cooling chamber 31. The second zone 49 is, for example, angularly shorter than the first zone 48.
[0099] For example, input 32 opens into the first zone 48. For example, the first channel 21 opens into the first zone 48 at the level of a first link section 35. For example, output 33 opens into the second zone 49. For example, the second channel 26 opens into the second zone 49 at the level of a second link section 36.
[0100] A fifth angle 50 between a first circumferential end 51 of the first zone 48 and the inlet 32 is, for example, less than 25% of a second angular extent around the axis of rotation A of the first zone 48. A sixth angle 52 between a second circumferential end 53 of the first zone 48, opposite the first circumferential end 53, and the first connecting section 35 is, for example, less than 25% of the second angular extent around the axis of rotation A of the first zone 48.
[0101] The angular extent with respect to the axis of rotation A of the second first zone 48 is for example between 270° and 355°.
[0102] Fig. 2 represents another partial schematic view of the second embodiment.
Claims
Demands
1. Housing (7) for a rotating electrical machine (1) having a rotation axis (A), the housing (7) comprising: a. a first lateral wall (6) located at a first axial end of the housing and having a first opening (18) suitable for receiving a shaft (4) of the rotating electrical machine (1), the first opening (18) comprising a first sealing surface (19), b. a first seal (20) mounted in the first sealing surface (19) and allowing a seal between the first side wall (6) and the shaft (4) of the rotating electrical machine (1), c. a second internal wall (17), distinct from the first lateral wall (6), forming with the first lateral wall (6) a first channel (21) for a cooling fluid and having a second opening (22) suitable for receiving the shaft (4) of the rotating electrical machine (1), the second opening comprising a second sealing surface (23), d. a second seal (24) mounted in the second sealing surface (23) and providing a seal between the second inner wall (17) and the shaft (4) of the rotating electrical machine (D, the first joint (20) and the second joint (24) being axially separated, a first supply space (25) connected to the first channel (21) and being formed between the first joint (20) and the second joint (24), the first supply space (25) being suitable to allow a connection between the first channel (21) and a first inlet of the shaft (4) of the rotating electrical machine (1) for the passage of the cooling fluid.
2. Housing (7) for rotating electrical machine according to the preceding claim in which the first channel (21) extends from 180° to 360° around the axis of rotation (A).
3. Housing (7) for a rotating electrical machine (1) according to claim 1 comprising: a. a second channel (26) formed between the first side wall (6) and the second inner wall (17), the second canal (26) being distinct from the first canal (21), b. a second supply space (27) connected to the second channel (26) and formed between the first joint (20) and the second joint (24), the second supply space (27) being distinct from the first supply space, the second supply space (27) being suitable to permit a connection between the second channel (26) and a second inlet of the shaft (4) of the rotating electrical machine (1) for the passage of the cooling fluid.
4. Housing (7) for rotating electrical machine (1) according to the preceding claim in which the second power supply space (27) is separated from the first power supply space (25) by a separating wall (28) formed in the first side wall (6) or the second internal wall (17).
5. Housing (7) for rotating electrical machine according to any one of the preceding claims comprising: a. an inner ring (29) suitable for receiving, in particular by press fitting, a stator (2) of the rotating electrical machine (1), b. an outer ring (30) radially outside the inner ring (29) and forming with the inner ring (29) a cooling chamber (31) suitable for receiving the cooling fluid.
6. Casing (7) for rotating electrical machine (1) according to the preceding claim taken in combination with claim 3 in which the cooling chamber (31) comprises; a. an inlet (32) suitable for allowing the entry of the cooling fluid into the cooling chamber (31), b. an outlet (33) suitable for allowing the outlet of the cooling fluid from the cooling chamber (31), c. a first low wall (34) extending from a first axial end (45) of the cooling chamber to a second axial end (46) of the cooling chamber, the inlet (32) and outlet (33) opening on either side of the first wall (34), the first wall (34) allowing to promote a circumferential circulation of the fluid in the cooling chamber (31), the first channel (21) opening into the cooling chamber at the level of a first connecting section (35), circumferentially on a first side (37) of the first wall (34), and the second channel (26) opening into the cooling chamber (31) at the level of a second connecting section (36), circumferentially on a second side (38) of the first wall (34) opposite the first side (37).
7. A housing (7) for a rotating electrical machine (1) according to the preceding claim, wherein a first angle (39), about the axis of rotation (A), between the inlet (32) and the first side (37) of the first wall (34) is less than 25% of a first angular extent (41) of the cooling chamber (31) between the first (37) side of the first wall (34) and the second side (38) of the first wall (34) about the axis of rotation (A), and wherein a second angle (42), about the axis of rotation (A), between the first connecting section (35) and the first side (37) of the first wall (34) is less than 25% of the first angular extent (41), and wherein a third angle (39), about the axis of rotation (A), between the outlet and the second side (38) of the first wall (34) is less than 25% of the first extent angular (42), and in which a fourth angle (43), around the axis of rotation (A),between the second connecting section (36) and the second side (38) of the first wall (34) is less than 25% of the first angular extent (41).
8. Housing (7) for rotating electrical machine (1) according to claim 5 taken in combination with claim 3 in which the cooling chamber (31) comprises; a. an inlet (32) suitable for allowing the entry of the cooling fluid into the cooling chamber (31), b. an outlet (33) suitable for allowing the outlet of the cooling fluid from the cooling chamber (31), c. a second wall (44) extending from a first axial end (45) of the cooling chamber (31) to a second axial end (46) of the cooling chamber (31), d. a third low wall (47) extending from the first end axial (45) of the cooling chamber (31) to the second axial end (46) of the cooling chamber (31), the second wall (44) and the third wall (47) delimiting a first zone (48) and a second zone (49) of the cooling chamber (31), the second zone (49) being angularly shorter than the first zone (48), the inlet (32) opening into the first zone (48) and the first channel (21) opening into the first zone (48) at the level of a first connecting section (35), and the outlet (33) opening into the second zone (49) and the second channel (26) opening into the second zone (49) at the level of a second connecting section (36).
9. Housing (7) for rotating electrical machine (1) according to the preceding claim wherein a fifth angle (50) between a first circumferential end (51) of the first zone (48) and the inlet (32) is less than 25% of a second angular extent around the axis of rotation (A) of the first zone (48) and a sixth angle (52) between a second circumferential end (53) of the first zone (48), opposite the first circumferential end (53), and the first connecting section (35) is less than 25% of the second angular extent around the axis of rotation (A) of the first zone (48).
10. Housing (7) for rotating electrical machine (1) according to the preceding claim in which the angular range with respect to the axis of rotation (A) of the first zone (48) is between 270° and 355°.
11. Housing (7) for rotating electrical machine (1) according to any one of claims 5 to 10 in which the inner ring (29) is formed of material with the second inner wall (17).
12. Housing (7) for rotating electrical machine (1) according to any one of the preceding claims comprising a second side wall (5) located at a second axial end of the housing (7).
13. Housing (7) for rotating electrical machine (1) according to any one of claims 5 to 11 taken in combination with claim 12 in which the second side wall (5) is formed of material with the outer ring (30).
14. Housing (7) for rotating electrical machine (1) according to one of the claims previous indications in which the first opening (18) includes a bearing surface (54) suitable for receiving a first bearing (12) suitable for supporting in rotation the shaft (4) of the rotating electrical machine (1).
15. Rotating electrical machine (1) comprising: a. a housing (7) according to any one of the preceding claims, b. a stator (2) supported by the casing (7), c. a rotor (3) supported in rotation by the casing (7).