Rotor for a rotating electric machine and a rotating electric machine equipped with the rotor

Abstract

The present invention relates to a rotor (3) for a rotating electric machine (1), the rotor (3) comprising: a rotor body (16), the rotor body comprising a first cavity (23) extending from a first end (24) of the rotor body (16) to a second end (25) of the rotor body (16); a permanent magnet (26) accommodated in the first cavity (23), wherein at least a first face (28) of at least one permanent magnet in the permanent magnet (26) is aligned with a second face (28) of one of the first cavities (23) accommodating the at least one permanent magnet (26); 27) forms a fixed space (29); a first retaining assembly (15) supported on the first end (24) of the rotor body (16); resin introduced into the fixed space (29), the first retaining assembly (15) comprising: a supply passage (18) communicating with the fixed space (29), the supply passage (18) being capable of receiving a resin supply device; a vent (32) communicating with the fixed space (29) and being capable of allowing gas to escape when the resin is introduced, the supply passage (18) and the vent (32) being different. The present invention also relates to a rotating electric machine equipped with such a rotor.

Description

Technical Field

[0001] The present invention relates to a rotor for a rotating electric machine, the rotor comprising permanent magnets fixed in place using resin. The present invention also relates to a rotating electric machine equipped with such a rotor. Background Art

[0002] From Japanese patent JP2014222964A2 a rotor for a rotating electrical machine is known, which rotor is capable of interacting with a stator of the rotating electrical machine and rotating relative to an axis of rotation, the rotor comprising:

[0003] - a rotor body comprising a first cavity extending from a first end of the rotor body in the direction of the rotation axis to a second end of the rotor body;

[0004] - permanent magnets housed in these first cavities, forming a fixed space between at least a first face of at least one permanent magnet and a second face of the first cavity housing this at least one permanent magnet;

[0005] - The resin introduced into the fixed space;

[0006] In rotors of this type, when the fixed spaces are filled with resin, there is a risk of bubbles forming in the resin. These bubbles lead to poor fixation of the permanent magnets. This poor fixation of the magnets leads to difficulties in balancing the rotor due to the uncontrolled movement of the permanent magnets during the balancing operation. In order to reduce the number of bubbles, long cycle times are required to allow the bubbles to rise to the resin surface. Such long cycle times can lead to significant additional costs. In addition, bubbles that rise to the surface can lead to poor filling of the fixed spaces.

[0007] The present invention seeks to overcome all or some of these disadvantages. Summary of the invention

[0008] The invention relates to a rotor for a rotating electric machine, the rotor being capable of interacting with a stator of the rotating electric machine and rotating relative to a rotation axis, the rotor comprising:

[0009] - a rotor body comprising a first cavity extending from a first end of the rotor body in the direction of the rotation axis to a second end of the rotor body;

[0010] - permanent magnets housed in these first cavities, forming a fixed space between at least a first face of at least one permanent magnet and a second face of the first cavity housing this at least one permanent magnet;

[0011] - a first retaining assembly supported on a first end of the rotor body;

[0012] - The resin introduced into the fixed space;

[0013] The first retaining assembly comprises:

[0014] - a supply passage in communication with the fixed space, the supply passage being capable of receiving a resin supply device;

[0015] - a vent which communicates with the fixed space and is able to allow the gases to escape when the resin is introduced,

[0016] The supply passage and the vent are distinct.

[0017] The use of such vents makes it easier to fill the fixed space with resin by making it easier for gases, especially atmospheric air, which occupied the fixed space before the resin was introduced to escape. It also reduces the formation of bubbles in the resin. As a result, the fixation of the permanent magnets is improved. Since the permanent magnets are properly fixed, the rotor is easier to balance.

[0018] According to an additional feature of the present invention, the vent includes a first passage formed in the first retention assembly, a first end of the first passage opening into the fixed space.

[0019] The use of such a first passage allows the gas to escape away from the fixed space. Thus, for example, the gas can escape at a radius radially more inside than the fixed space. For example, such a position allows the area on the radially outer side of the escape passage to be used for other functions, such as for retaining the first retaining assembly on the rotor body.

[0020] According to an additional feature of the invention, the rotor body includes a second cavity, and the first passage includes a second end opening into the second cavity.

[0021] Such a second cavity reduces the weight of the rotor while reducing magnetic losses in the rotor body. Furthermore, the use of this second cavity to allow gas to escape when the resin is introduced means that this escape path can be offset without lengthening the first path. The extent to which the mechanical strength of the first retaining assembly is reduced by the first path can therefore be limited.

[0022] According to an additional feature of the invention, the vent includes a first hole extending through the first retention assembly.

[0023] Creating a first hole in the first retention component allows gas to escape through the first retention component as resin is introduced.

[0024] According to an additional feature of the invention, the first hole opens into the second cavity.

[0025] This position of the first hole makes it easier for the gas to escape. Specifically, the gas that has reached the second cavity via the second end of the first passage can leave the rotor via the first hole.

[0026] According to an additional feature of the invention, the first passageway includes a first groove formed in the first retention assembly.

[0027] Using such a first recess in the first retaining assembly may limit the number of components of the first retaining assembly.The first retaining assembly comprises, for example, a single component in which the first recess is formed.

[0028] According to an additional feature of the invention, the first retaining assembly comprises a first end portion and a first intermediate portion, the first intermediate portion having a flat shape, in particular made of sheet metal and clamped between the first end portion and the rotor body, the first passage comprising a first opening through the thickness of the first intermediate portion, the first opening in particular being made as a cutout.

[0029] Using such a first intermediate portion may reduce the number of machining operations performed on the first end portion.

[0030] According to an additional feature of the present invention, the ventilation opening is in communication with a plurality of fixed spaces.

[0031] The use of vents in communication with several fixed spaces makes it possible to reduce the number of vents. Thus, the manufacture of the first retaining assembly is simplified. Such vents can also reduce the space occupied by the vents and thus limit the space occupied by the rotor.

[0032] According to an additional feature of the present invention, the rotor includes a second retaining assembly supported on the second end of the rotor body, and the first retaining assembly and the second retaining assembly clamp the rotor body between the first end of the rotor body and the second end of the rotor body, respectively.

[0033] The use of a second retaining assembly in addition to the first retaining assembly will improve the mutual retention of the various components of the rotor.

[0034] According to an additional feature of the present invention, the fixing space includes a first channel and a second channel, and the second retaining assembly includes a second passage connecting the first channel and the second channel.

[0035] The use of the first channel and the second channel allows the permanent magnet to be better fixed by the resin. Specifically, due to the two channels, the permanent magnet is fixed to the rotor body by the resin in at least two zones. In addition, since the first channel and the second channel are filled with non-magnetic resin, they can be used to guide the magnetic flux, thereby limiting the magnetic losses in the rotor. Therefore, it is possible to improve the performance of the motor. Such a second passage makes it easier for gas and resin to flow from the first channel to the second channel. Therefore, the fixed space can be filled more quickly. Therefore, the manufacturing cost of the rotor can be reduced.

[0036] According to an additional feature of the invention, the supply passage is in communication with the first passage and the vent is in communication with the second passage.

[0037] Such an arrangement allows for improved flow of the resin when the resin is introduced into the fixed space.

[0038] According to additional features, the second passageway includes a second groove formed in the second retention assembly.

[0039] The use of such a second recess in the second retaining assembly may limit the number of components of the second retaining assembly.The second retaining assembly comprises, for example, a single component in which the second recess is formed.

[0040] According to an additional feature of the invention, the second retaining assembly comprises a second end portion and a second intermediate portion, the second intermediate portion having a flat shape, in particular made of sheet metal, and sandwiched between the second end portion and the rotor body, the second passage comprising a second opening through the thickness of the second intermediate portion, the second opening in particular being made as a cutout.

[0041] Using such a second intermediate portion may reduce the machining operations performed on the second end portion.

[0042] According to an additional characteristic of the invention, the supply passage communicates with several fixed spaces, in particular two.

[0043] Using such a supply passage allows the use of a wider passage and thus makes it easier for the resin to flow when it is introduced. Specifically, it is therefore possible to eliminate the baffles between the supply passages and thus have a thicker supply passage without increasing the total amount of space the supply passage occupies in the first retaining assembly.

[0044] According to an additional feature of the invention, the first cavity and the permanent magnet have a direction of rotation axis.

[0045] According to an additional feature of the invention, the rotor body comprises third cavities having axes parallel to the axis of rotation and extending between a first radius and a second radius, the first radius being smaller than the second radius,

[0046] The rotor comprises tie rods, in particular screw rods, which pass through the third cavity and through the second holes in the first retaining assembly so that the rotor body can be clamped between the first retaining assembly and the second retaining assembly.

[0047] The supply passage is located radially inside the first radius or radially outside the second radius.

[0048] Such an arrangement allows the rotor to obtain greater mechanical strength. In particular, due to this arrangement, the supply path is away from the area where the tie rods are assembled, which hold the first retaining assembly, the second retaining assembly and the rotor body together. Therefore, it is possible, for example, to use more tie rods or tie rods of larger size.

[0049] According to an additional feature of the invention, the first hole is located radially inside the first radius or radially outside the second radius.

[0050] Such an arrangement allows the rotor to obtain greater mechanical strength. In particular, due to this arrangement, the first hole is away from the area where the tie rods are assembled, which hold the first retention assembly, the second retention assembly and the rotor body together. Therefore, for example, more tie rods or tie rods of larger size can be used.

[0051] The invention also relates to a rotating electric machine comprising a stator and a rotor as described above.

[0052] In summary, the rotor may include any number of pole pairs, such as six or eight pole pairs.

[0053] In summary, the rotating electrical machine may have a stator having a multi-phase electrical winding formed, for example, by wires or conductive bars connected to one another.

[0054] The rotating electrical machine may comprise power electronics that can be connected to the on-board network of the vehicle. The power electronics comprise, for example, an inverter / rectifier that allows the on-board network to be charged or to be powered by the network, depending on whether the rotating electrical machine is operated as a motor or as a generator.

[0055] The rotary electric machine may further comprise a pulley or any other device connected to the rest of the vehicle's powertrain. For example, the rotary electric machine is connected to the crankshaft of the vehicle's combustion engine, in particular via a belt. As a variant, the rotary electric machine is connected elsewhere in the powertrain, for example at the input of a gearbox from the point of view of transmitting torque to the vehicle's wheels, at the output of a gearbox from the point of view of transmitting torque to the vehicle's wheels, at the gearbox from the point of view of transmitting torque to the vehicle's wheels, or at the front axle assembly or rear axle assembly of the powertrain. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The invention may be better understood by reading the following description of non-limiting exemplary embodiments of the invention and by studying the accompanying drawings, in which:

[0057] - Figure 1 A partial schematic diagram showing a cross section of a rotating electrical machine,

[0058] - Figure 2 shows a schematic diagram of a rotor for a rotating electrical machine according to a first embodiment of the present invention,

[0059] - Figure 3 Shows Figure 2 Partial schematic diagram of the rotor,

[0060] - Figure 4 Shows Figure 3 Details of the view,

[0061] - Figure 5 Shows Figure 2 A schematic diagram of a first retaining assembly of a rotor,

[0062] - Figure 6 Shows Figure 2 A schematic diagram of the second retaining assembly of the rotor,

[0063] - Figure 7 Shown in perpendicular to Figure 2 Detail of the view in the plane of the rotation axis of the rotor,

[0064] - Figure 8 Shows Figure 2 Partial view of a cross section of a rotor,

[0065] - Fig. 9 A partial view of a cross section of a rotor according to a second embodiment is shown. DETAILED DESCRIPTION

[0066] In all the drawings, the same elements or elements performing the same function are marked with the same reference numerals. The following embodiments are examples. Although the description relates to one or more embodiments, this does not necessarily mean that each reference numeral relates to the same embodiment, or that these features apply only to a single embodiment. The independent features of the various embodiments may also be combined or interchanged to create other embodiments.

[0067] Figure 1 A partial schematic diagram of a cross section of a rotating electrical machine 1 with a rotation axis A is shown. The rotating electrical machine 1 comprises a stator 2 and a rotor 3 in a housing. The rotor 3 is capable of interacting with the stator 2. The housing comprises, for example, a first support carrier 5, a second support carrier 6, and a tubular spacer 7. The tubular spacer 7 is, for example, sandwiched between the first support carrier 5 and the second support carrier 6, for example by using tie rods (not depicted) between the first support carrier 5 and the second support carrier 6. The stator is fixed in the housing, for example tightly fitted in the tubular spacer 7.

[0068] Within the meaning of the present invention, the terms "radial" and "radially" are to be understood relative to the axis of rotation A, unless otherwise indicated. Within the meaning of the present invention, "longitudinal" and "longitudinally" refer to in the direction of the axis of rotation A, unless otherwise indicated.

[0069] In a non-illustrated embodiment of the invention, the tubular spacer comprises a cooling chamber in which a liquid coolant circulates.

[0070] In a non-illustrated embodiment of the invention, there are no tubular spacers and the stator is sandwiched between a first support carrier and a second support carrier.

[0071] The stator comprises a stator body 9 and a winding 8. The stator body 9 comprises, for example, a first magnetic lamination stack. For example, the winding 8 comprises an electrical conductor, the active part of which passes through a slot formed in the stator body 9, and a connection part or a winding overhang is formed outside the slot. The winding 8 is, for example, a hairpin winding type winding.

[0072] The rotor 3 is fixed, for example, on a shaft 4 having an axis of rotation A. The shaft 4 is guided in rotation by a first rolling bearing 11 mounted in a first bearing carrier 5 and a second rolling bearing 12 mounted in a second bearing carrier 6. A drive element 13 , for example a pulley or a gear, is fixed on the shaft 4 .

[0073] In another embodiment not shown, other known rotation guide means, such as plain journal bearings, are used to guide the shaft 4 in rotation relative to the first and second bearing carriers.

[0074] Figure 2 A rotor 3 according to a first embodiment is shown, as well as a shaft 4. The rotor 3 comprises a rotor body 16. The rotor body 16 extends longitudinally from a first end 24 of the rotor body 16 to a second end 25 of the rotor body 16.

[0075] The rotor 3 further includes a first retaining assembly 15 supported on a first end 24 of the rotor body 16. The rotor 3 may also include a second retaining assembly 14 supported on a second end 25 of the rotor body 16. Thus, the rotor body 16 may be clamped between the first retaining assembly 15 and the second retaining assembly 14.

[0076] Figure 3 is a partial view of the rotor 3 and shaft 4. To allow other parts of the rotor 3 to be seen in more detail, Figure 3 The first retaining assembly 15 is not shown.

[0077] First cavities 23 , for example longitudinal, are formed in the rotor body 16 . The rotor body 16 comprises, for example, a second magnetic lamination stack. The rotor 3 further comprises permanent magnets 26 , for example longitudinal, housed in these first cavities 23 .

[0078] In the embodiment of the present invention shown in the drawings, the permanent magnet 26 includes a plurality of elementary permanent magnets.

[0079] In another, not shown, embodiment of the invention, the permanent magnet comprises a single elementary permanent magnet.

[0080] A fixing space 29 is formed between at least a first face 28 of at least one permanent magnet 26 and a second face 27 of a first cavity 23 accommodating the at least one permanent magnet 26. A resin is introduced into the fixing space, which is not depicted in the drawings to improve the readability of the drawings. The resin helps to fix the permanent magnet 26 in the first cavity 23 of the rotor body 16.

[0081] In the embodiment of the invention shown in the drawings, the rotor 3 comprises magnetic poles formed by two permanent magnets forming a V-shape in a plane orthogonal to the axis of rotation.

[0082] In another embodiment of the invention, not shown, the magnetic poles of the rotor are formed by three permanent magnets forming a U-shape in a plane orthogonal to the axis of rotation.

[0083] In another embodiment of the invention, not shown, the magnetic poles of the rotor are formed by magnets which are U-shaped in a plane orthogonal to the axis of rotation.

[0084] In another, not shown, embodiment of the invention, the magnetic poles of the rotor are formed by radially magnetized magnets.

[0085] Figure 4 Shows Figure 3 Detail of the drawing, showing the fixed space 29.

[0086] The fixed space 29 may include a first passage 38 and a second passage 39 .

[0087] Figure 5 The first retaining assembly 15 of the rotor 3 is shown. The first retaining assembly 15 comprises a supply passage 18 communicating with the fixing space 29. The supply passage 18 is capable of receiving a resin supply device. The resin supply device comprises, for example, a hollow needle tube, as the hollow needle tube enters the supply passage 18, the resin is introduced. For example, the resin is introduced in liquid form and then polymerized using a heating device.

[0088] The first retaining assembly further includes a vent 32 in communication with the securing space 29. The vent 32 allows gas to escape when the resin is introduced.

[0089] The supply passage 18 and the vent 32 are distinct.

[0090] The supply passage 18 may communicate with several fixed spaces 29. For example, in the embodiment shown in the drawings, the supply passage 18 communicates with two fixed spaces 29.

[0091] The vent 32 may include a first passage 34 formed in the first retaining component 15. The first passage 34 includes, for example, a first groove 37 formed in the first retaining component 15. The first groove 37 is machined in the first retaining component 15, for example.

[0092] The first passage 34 comprises a first end 30 which opens into the fixed space 29 , for example.

[0093] The rotor body 16 may include a second cavity 35, such as a longitudinal cavity radially inwardly of the first cavity 23. The first passage 34 may include a second end 31 that opens into the second cavity 35.

[0094] The vent 32 may further include a first hole 36 passing through the first retention assembly 15. The first hole 36 may open into the second cavity 35.

[0095] In another embodiment of the present invention which is not shown, the vent further comprises a first hole, and the second end of the first passage leads directly to the first hole.

[0096] In another embodiment of the present invention which is not shown, a first space, such as an annular space, is formed between the shaft and the first retaining assembly. The second end of the first passage leads to the first space.

[0097] The vent 32 may be in communication with several fixed spaces 29. In the embodiment of the invention shown in the drawings, the vent 32 is in communication with two fixed spaces 29. For example, the first passage 34 includes a first portion 51 oriented circumferentially relative to the rotation axis A and a second portion 52 connected to the second cavity 35. The first portion 51, for example, connects two fixed spaces 29. The first portion 51 and the second portion 52 are connected to each other.

[0098] The fixed space 29 may include a first channel 38 and a second channel 39. The first channel 38 and the second channel 39 are formed to face the two opposite first faces 28 of the permanent magnet 26. The supply passage 18 may communicate with the first channel 38, and the vent 32 may communicate with the second channel 39.

[0099] Figure 6 The second retaining assembly 14 of the rotor 3 according to the first embodiment of the invention is shown. The second retaining assembly 14 may include a second passage 40 connecting the first channel 38 to the second channel 39.

[0100] In the first embodiment of the present invention, the second passage 40 may include a second groove 41 formed in the second retaining component 14. The second groove is machined in the second retaining component 14, for example.

[0101] The second passage 40 may also connect several fixed spaces 29. For example, in the embodiment of the present invention depicted in the drawings, the second passage 40 connects two fixed spaces 29. The second passage 40 includes, for example, a third portion 53 connecting the first channel 38 to the second channel 39, and a fourth portion 54 connecting the two third portions.

[0102] Figure 7A detailed view of the rotor 3 is shown.

[0103] The rotor body may include third cavities 21 having axes parallel to the axis of rotation A and extending between a first radius 42 and a second radius 43, the first radius 42 being smaller than the second radius 43. The tie rods 17 may pass through the third cavities 21 and through the second holes 20 of the first retaining assembly 15. The tie rods 17 may allow the rotor body 16 to be clamped between the first retaining assembly 15 and the second retaining assembly 14. The tie rods may also pass through the third holes 22 of the second retaining assembly 14. For example, the tie rods 17 are screws.

[0104] For example, the first hole 36 and the supply passage 18 are each located radially inward of the first radius 42 or radially outward of the second radius 43 .

[0105] Figure 8 The rotor 3 of the first embodiment of the present invention is shown in a partial cross section in the cutting plane. Figure 7 The indicated line 33 is intercepted.

[0106] This cross section may indicate a path 44 that the resin and gas travel when the resin is introduced into the fixed space.

[0107] Fig. 9 FIG. 1 shows a partial cross section of a rotor 3 according to a second embodiment of the present invention in a cutting plane. Figure 8 The cross section is along Figure 7 The indicated line 33 is intercepted.

[0108] The second embodiment of the present invention is similar to the first embodiment of the present invention. However, the first retaining assembly 15 and the second retaining assembly 14 are implemented differently.

[0109] In the second embodiment of the present invention, the first retaining assembly 15 may include a first end portion 45 and a first intermediate portion 46 having a flat shape. The first intermediate portion 46 is made of a metal sheet, for example. The first intermediate portion 46 is sandwiched between the first end portion 45 and the rotor body 16, for example. The first passage includes a first opening 47 passing through the thickness of the first intermediate portion 46. The first opening 47 is made, for example, as a cutout.

[0110] Likewise, the second retaining assembly 14 may include a second end portion 48 and a second intermediate portion 49 having a flat shape. The second intermediate portion 49 is made of a metal sheet, for example. The second intermediate portion 49 is sandwiched between the second end portion 48 and the rotor body 16, for example. The second passage 40 includes a second opening 50 passing through the thickness of the second intermediate portion 49. The second opening 50 is made as a cutout.

[0111] In another non-illustrated embodiment of the present invention, the first retaining assembly is similar to the first retaining assembly described for the first embodiment of the present invention, and the second retaining assembly is similar to the second retaining assembly described for the second embodiment of the present invention.

[0112] In another non-depicted embodiment of the present invention, the first retention assembly is similar to the first retention assembly described with respect to the second embodiment of the present invention, and the second retention assembly is similar to the second retention assembly described with respect to the first embodiment of the present invention.

Claims

1. A rotor (3) for a rotating electrical machine (1), the rotor being capable of interacting with a stator (2) of the rotating electrical machine (1) and rotating relative to a rotation axis (A), the rotor (3) comprising: - a rotor body (16) comprising a first cavity (23) extending from a first end (24) of the rotor body (16) in the direction of the rotation axis (A) to a second end (25) of the rotor body (16); - a permanent magnet (26) housed in the first cavity (23), a fixed space (29) being formed between at least a first face (28) of at least one of the permanent magnets (26) and a second face (27) of one of the first cavities (23) housing the at least one permanent magnet (26); - a first retaining assembly (15) supported on a first end (24) of the rotor body (16); - a resin introduced into the fixing space (29), The first retaining assembly (15) comprises: - a supply passage (18) communicating with the fixed space (29), the supply passage (18) being capable of receiving a resin supply device; a vent (32) communicating with the fixed space (29) and capable of allowing the escape of gases when the resin is introduced, The supply passage (18) and the vent (32) are distinct; The vent (32) comprises a first passage (34) formed in the first retaining assembly (15), and a first end (30) of the first passage (34) leads to the fixed space (29); The rotor body (16) includes a second cavity (35), and the first passage includes a second end (31) opening into the second cavity (35).

2. The rotor (3) according to claim 1, wherein: The vent (32) includes a first hole (36) extending through the first retaining assembly (15).

3. The rotor (3) according to claim 2, wherein: The first hole (36) leads to the second cavity (35).

4. The rotor (3) according to claim 1, wherein: The first passage (34) includes a first groove (37) formed in the first retaining assembly (15).

5. The rotor (3) according to claim 1, wherein: The first retaining assembly (15) includes a first end portion (45) and a first middle portion (46), the first middle portion having a flat shape and being sandwiched between the first end portion (45) and the rotor body (16), the first passage including a first opening (47) passing through the thickness of the first middle portion (46).

6. The rotor (3) according to claim 5, wherein: The first intermediate portion (46) is made of a metal sheet; and / or the first opening (47) is made as a cutout.

7. The rotor (3) according to any one of claims 1 to 5, wherein: The ventilation opening (32) is in communication with a plurality of fixed spaces (29).

8. The rotor (3) according to any one of claims 1 to 5, comprises a second retaining assembly (14) supported on the second end (25) of the rotor body (16), wherein the first retaining assembly (15) and the second retaining assembly (14) respectively clamp the rotor body (16) between the first end (24) of the rotor body (16) and the second end (25) of the rotor body (16).

9. The rotor (3) according to claim 8, wherein: The fixing space (29) includes a first channel (38) and a second channel (39), and the second retaining assembly (14) includes a second passage (40) connecting the first channel (38) and the second channel (39).

10. The rotor (3) according to claim 9, wherein: The supply passage (18) is in communication with the first passage (38), and the vent (32) is in communication with the second passage (39).

11. The rotor (3) according to claim 9, wherein: The second passage (40) includes a second groove (41) formed in the second retaining assembly (14).

12. The rotor (3) according to claim 9, wherein: The second retaining assembly (14) includes a second end portion (48) and a second middle portion (49), the second middle portion having a flat shape and being sandwiched between the second end portion (48) and the rotor body (16), and the second passage (40) includes a second opening (50) passing through the thickness of the second middle portion (49).

13. The rotor (3) according to claim 12, wherein: The second intermediate portion (49) is made of a metal sheet; and / or, the second opening (50) is made as a cutout.

14. A rotor (3) according to any one of claims 1 to 5, wherein: The supply passage (18) is in communication with a plurality of fixed spaces (29).

15. The rotor (3) according to claim 14, wherein: The supply passage (18) is in communication with two fixed spaces (29).

16. The rotor (3) according to any one of claims 1 to 5, wherein: The first cavity (23) and the permanent magnet (26) have an orientation of the rotation axis (A).

17. The rotor (3) according to claim 8, wherein: The rotor body (16) comprises a third cavity (21) having an axis parallel to the rotation axis (A) and extending between a first radius (42) and a second radius (43), The rotor comprises a tie rod (17) which passes through the third cavity (21) and through a second hole (20) in the first retaining assembly (15), so that the rotor body (16) can be clamped between the first retaining assembly (15) and the second retaining assembly (14), The supply passage (18) is located radially inside the first radius (42) or radially outside the second radius (43).

18. The rotor (3) according to claim 17, wherein: The tie rod (17) is a screw rod.

19. The rotor (3) according to claim 17, wherein: The vent (32) includes a first hole (36) passing through the first retaining assembly (15); The first hole (36) is located radially inside the first radius (42) or radially outside the second radius (43).

20. A rotating electrical machine (1) comprising a stator (2) and a rotor (3) according to any one of claims 1 to 19.

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