Rotor with winding for a rotary electric machine, and machine comprising a rotor

Abstract

The invention relates to a rotor (1) for a rotary electric machine, comprising a shaft (3) which has, in series along a longitudinal axis (L3), a first zone (4), a winding zone (5), and a second zone, the rotor (1) comprising a transmission module (10) between a power source and the winding, the transmission module (10) comprising a longitudinal portion (11), a first radial portion (12) and a second radial portion, the longitudinal portion (11) comprising an electrically insulating longitudinal body (13), the first radial portion (12) comprising a first insulating body (28), the second radial portion comprising a second insulating body, a first electrical line (30) running through the inside of the longitudinal body (13) of the longitudinal portion (11), and passing through the first body (28) of the first radial portion (12), a second electrical line running through the inside of the longitudinal body (13) of the longitudinal portion (11), and passing through the second body of the second radial portion. The longitudinal portion (11), the first radial portion (12) and the second radial portion are separate parts, with a longitudinal section (31) of the first line (30) and a longitudinal section of the second line being retained in the longitudinal body (13), a radial section (34) of the first line (31) being retained in the first body (28), and a radial section of the second line being retained in the second body, or the longitudinal portion, and the first radial portion and the second radial portion form an integral part in which the first line and the second line are retained.

Description

[0001] DESCRIPTION TITLE: Rotor with winding for rotating electrical machine, and machine comprising a rotor

[0002] Technical field

[0003] The invention relates generally to a rotor with winding for a rotating electrical machine, as well as to the machine comprising the rotor. The invention relates more particularly to an area of ​​a rotor shaft intended for supplying the winding. The invention is used, among other things, in motors or geared motors for electric or hybrid type motor vehicles.

[0004] Previous techniques

[0005] There are different types of wound rotor rotating electrical machines, including synchronous motors. In these machines, the rotor comprises a shaft intended to be mounted rotatably about its axis. The shaft is guided in rotation by rolling element bearings, such as balls, needles, cylindrical or frustoconical rollers. A stack of laminations is placed on the rotor shaft coaxially with the axis, the stack of laminations forming a plurality of radially protruding poles, a winding of electrically conductive wire being provided to be wound around each pole. A device for guiding the electrically conductive wire is arranged axially at each end of the stack of laminations. Each guiding device has a central orifice for the shaft to pass through. An electrical power supply for the winding is provided by a source external to the machine and a transmission module attached to the rotor.The module generally has conductive rings on which brushes from the external source rest.

[0006] An example of a wound rotor synchronous electrical machine is given by the invention patent FR 3 084 220 B l. The machine according to this document can be a motor. One use of this motor is cooperation with the drive wheels of a vehicle, such as an automobile, a motorcycle, or other. For this application the motor is subjected to various constraints, in particular mechanical ones, which can be significant. Indeed, the rotor is required to rotate at very high speeds, up to 12000 rpm, or even more. The rotor and the guide bearings must therefore withstand the constraints linked to these speeds. In particular, for optimal operation and a sufficient service life, the shaft guide bearings must, on the one hand, be preserved during their installation and, on the other hand, retain their properties over time.With this in mind, document FR 3 084 220 B 1 proposes a rotor adapted to high centrifugal forces, in particular by simplifying its structure, facilitating the assembly of its components, and allowing its balancing.

[0007] The electrical machine according to document FR 3 084 220 B 1 is generally satisfactory, in the sense that it operates according to expectations. However, malfunctions have sometimes been observed, especially under very intense or prolonged operating conditions. In these exceptional conditions, which can occur, it has happened that the bearing located on the side of the electrical transmission module deteriorates. The deterioration of the bearing is the consequence of excessive fatigue work of its inner ring. In fact, the rotor shaft has two longitudinal grooves for the passage of two arms of the transmission module, from the conductive rings to the winding. These grooves create an interruption of the surface of revolution which cooperates with the inner ring of the bearing. Two segments of the inner ring are in contact with the shaft, while two other segments are each opposite an arm of the module.The inner ring is in contact with the shaft where the surface of revolution is not interrupted by a groove. It follows that at each groove, the inner ring is subjected to alternating microdeformations which create alternating stresses. This results in mechanical fatigue of the inner ring. The stresses eventually create microcracks, which enlarge until they cause deterioration of the rolling tracks of the two rings and the rolling elements.

[0008] As a result, the rotor's lifespan, and therefore that of the motor, is reduced. Or, early maintenance is required, which means additional costs and wasted time. Disassembling, replacing a bearing, and reassembling a motor are long, tedious, and expensive operations.

[0009] Another example of an electrical machine with a wound rotor is given by the patent application DE 10 2018 130 471 A1. According to this document, the rotor comprises a transmission module itself comprising a longitudinal part of revolution which carries two rings. The longitudinal part takes place in an open longitudinal cavity of the shaft, leaving the rings outside. A first electrical line coming from one of the rings crosses the longitudinal part in its length, then a radial angle transmission, to go towards the winding. In the same spirit, a second electrical line coming from the other of the rings crosses the longitudinal part in its length, then another radial angle transmission, to go towards the winding.

[0010] The installation of the transmission module on the shaft, according to document DE 10 2018 130 471 Al, is difficult to develop and implement. This is because the sections of the power lines that exit the longitudinal part to pass through the angle drives must be positioned correctly. This requires precision. The angle drives themselves must be positioned correctly, again precisely. In addition, care must be taken to ensure that the size of the electrical wire of the lines is adapted to the deformation by the angle drives.

[0011] Statement of the invention

[0012] The invention seeks to overcome the aforementioned drawbacks and has the general aim of improving an electrical connection between a source external to a machine and a winding of a rotor of said machine, particularly for a motor or a geared motor of a motor vehicle.

[0013] The invention seeks in particular to simplify the implementation of a transmission module between a power source and the rotor winding. The invention seeks to limit the level of precision necessary for the manufacture and assembly of the module. The invention also seeks to reduce the manufacturing and maintenance costs of the module. The invention also seeks to contain the dimensions of the rotor at the level of elements for its rotational guidance, to maximize the mechanical strength of the rotor, and to use a measured number of seals for sealing the machine in the module installation region. To do this, the invention proposes a rotor for a rotating electrical machine, the rotor comprising a shaft which successively has, along a longitudinal axis, a first zone, a winding zone, and a second zone, the rotor comprising a transmission module between a power source and the winding, the transmission module comprising a longitudinal part,a first radial portion and a second radial portion, the longitudinal portion comprising an electrically insulating longitudinal body which has an external surface of revolution and which extends in length between a distal end and a proximal end, the longitudinal body carrying near the distal end a first conductive ring and a second conductive ring separated from each other, the longitudinal portion taking place in a longitudinal cavity of the shaft open at a free end of the first zone, leaving the rings outside said cavity, the first radial portion comprising a first insulating body and taking place in a first cavity of the shaft at the proximal end of the longitudinal body, the second radial portion comprising a second insulating body and taking place in a second cavity of the shaft at the proximal end of the longitudinal body,a first electrical line running along the longitudinal body of the longitudinal portion inside from the first ring towards the proximal end, and passing through the first body of the first radial portion, a second electrical line running along the longitudinal body of the longitudinal portion inside from the second ring towards the proximal end, and passing through the second body of the second radial portion.,

[0014] The longitudinal portion, the first radial portion and the second radial portion are separate pieces, a longitudinal section of the first line and a longitudinal section of the second line being retained in the longitudinal body, a radial section of the first line being retained in the first body, and a radial section of the second line being retained in the second body, or the longitudinal portion, the first radial portion and the second radial portion form a single piece in which the first line and the second line are retained.

[0015] For separate parts, the longitudinal body permanently retains the longitudinal section of the first line and the longitudinal section of the second line, the first body permanently retains the radial section of the first line, and the second body permanently retains the radial section of the second line. For the single-piece part, the first line and the second line are permanently retained. This means that each section is held in a stable position in the part or that each line is held in a stable position in the part, before and after its placement on the rotor shaft. As a result, the placement of the lines is done by simply placing the parts or the part, depending on the configuration chosen. This advantageously results in the implementation of the transmission module being simple, and it does not require excessive precision. The manufacturing and maintenance costs of the rotor are moderate.Furthermore, because the longitudinal section is internal to the rotor shaft, the external surface of revolution of the first zone is continuous. This means that an inner ring of a guide bearing is in full contact with the shaft. Among the advantages that result from this, we can cite the control of the dimensions of the rotor, dimensions which remain measured to limit the size and weight of the latter. In addition, the mechanical resistance of the rotor is greater than it would be if the external surface of revolution were discontinuous. Furthermore, the seal between the rotor and the rest of the machine, for example a frame, is easy to obtain by traditional elements such as gaskets.

[0016] When the longitudinal portion, the first radial portion and the second radial portion of the transmission module are separate parts, the first zone and the winding zone of the shaft form a single-piece subdivision, the longitudinal cavity of the shaft has an internal surface of revolution, and a sealing means is provided between the external surface of revolution of the longitudinal body and the internal surface of revolution of the longitudinal cavity of the shaft.

[0017] This arrangement allows for simple and rapid installation of the transmission module on the shaft, with fairly wide functional clearances. It is sufficient to insert each part of the module into a dedicated housing, either by hand or by handling devices. In addition, the first zone of the rotor shaft has a regular peripheral surface for holding an inner bearing ring, which goes in the direction of optimizing the mechanical properties of the latter. The longitudinal section of the first line and the longitudinal section of the second line each protrude at the proximal end, in a direction away from the distal end, to bear respectively in a longitudinal direction on the radial section of the first line and on the radial section of the second line.

[0018] The first radial part and the second radial part of the transmission module are first put in place, then the longitudinal part is inserted in turn. The latter can then be removed and then put back in place, or even replaced, without disassembling and reassembling the machine. Maintenance is made easier.

[0019] A lug of the longitudinal section and a lug of the radial section of the first line are in contact, and a lug of the longitudinal section and a lug of the radial section of the second line are in contact. The lugs are elements whose geometry is stable over time, which provides reliability of use.

[0020] The radial section of the first line and the radial section of the second line each protrude at the proximal end, to bear respectively in a radial direction on the longitudinal section of the first line and on the longitudinal section of the second line.

[0021] This is a variant of the design which allows very precise positioning of the longitudinal part of the module.

[0022] A lug of the radial section of the first line and a lug of the radial section of the second line are respectively elastically stressed towards the longitudinal section of the first line and towards the longitudinal section of the second line.

[0023] An elastic stress exerts a mechanical braking effect at the same time as a continuity of electrical line.

[0024] A lug of the radial section of the first line and a lug of the radial section of the second line are respectively fitted into a first cavity of the longitudinal section and into a second cavity of the longitudinal section.

[0025] As a result of this arrangement, the longitudinal part of the module is held in its position by an obstacle connection.

[0026] When the longitudinal part, the first radial part and the second radial part form a single piece, the first zone of the shaft is attached to the winding zone, the longitudinal cavity of the shaft having an internal surface of revolution, and a sealing means being provided between the external surface of revolution of the longitudinal body and the internal surface of revolution of the longitudinal cavity of the shaft.

[0027] In this case, the manufacturing of the module is simpler.

[0028] The invention also relates to an electric machine comprising a wound rotor, in particular a motor comprising a transmission module as presented above, as well as to a vehicle comprising an electric machine.

[0029] Brief description of the figures

[0030] Other aims, characteristics and advantages of the invention will appear on reading the following description, given solely by way of non-limiting example, and made with reference to the appended figures for which:

[0031] - [Fig. l] is a partial longitudinal section of a wound rotor of an electric machine, showing a transmission module between a power source and the winding, according to a first embodiment of the invention,

[0032] - [Fig. 2] is similar to [Fig. 1], for a second embodiment of the invention,

[0033] - [Fig. 3 ] is similar to [Fig. l ], for a third embodiment of the invention,

[0034] - [Fig.4] is a cross-section along IV-IV of [Fig.3],

[0035] - [Fig. 5] is similar to [Fig. l], for a fourth embodiment of the invention.

[0036] Detailed description

[0037] Figure 1 shows a partial representation of an electrical machine, in this case a synchronous motor. More precisely, part of a wound rotor 1 and part of a stator 2 of the motor are visible. For example, the motor operates with a three-phase alternating current produced by a variator. Thus, the magnetic field of the stator can vary, in particular in power, speed and direction of rotation.

[0038] The rotor 1 comprises a shaft 3 intended to be rotatably mounted about its axis L3 in the stator 2. A stack, not shown, of laminations is placed on the shaft 3 of the rotor 1 coaxially with the axis L3, the stack of laminations forming a plurality of radially protruding poles. A winding, not shown, is carried out with an electrically conductive wire wound around each pole.

[0039] The shaft 3 successively has, along its axis L3, a first zone 4, a winding zone 5, and a second zone not shown. On the side of the first zone 4, the shaft is guided in rotation in the stator 2, for example by a ball bearing 6. Alternatively, a bearing with other rolling elements such as cylindrical rollers, frustoconical rollers or needles, a self-lubricated bearing, or other could be provided.

[0040] The first zone 4 of the shaft 3 receives a module 10 for transmitting electrical energy between a power supply device, not shown, and the winding of the rotor 1.

[0041] According to the first embodiment of the invention, the module 10 comprises a longitudinal part 11, a first radial part 12, and a second radial part not shown, these three parts being distinct.

[0042] The longitudinal part 11 comprises a longitudinal body 13, which is a part of revolution of axis L 13 delimited, at its periphery, by a surface of revolution 14 and, in length, between a distal end 15 and a proximal end 16. The latter is at the limit between the first zone 4 and the winding zone 5 of the shaft 3, the zones 4, 5 extending one from the other by continuity of material. The body 13 is an electrically insulating part, made with any suitable material such as a plastic material. For example, the body 13 is made of polyethylene, polyamide, or other. The body 13 carries, near the distal end 15, a first conductive ring 17 and a second conductive ring 18 spaced from one another.

[0043] The body 13 is intended to be mounted in a longitudinal cavity 25 of the shaft 3, a cavity open at a free end 26 of the first zone 4. For this purpose, the longitudinal cavity 25 of the shaft 3 has an internal surface of revolution 27.

[0044] The first radial portion 12 comprises a first insulating body 28, and is placed in a first radial cavity 29 of the shaft 3, at the proximal end 16 of the longitudinal body 13, at the boundary between the first zone 4 and the winding zone 5 of the shaft 3. In the same spirit, without this being shown, the second radial portion comprises a second insulating body and is placed in a second radial cavity of the shaft 3, at the proximal end 16 of the longitudinal body 13, at the boundary between the first zone 4 and the winding zone 5 of the shaft 3. In a non-limiting manner, the first radial portion 12 and the second radial portion are diametrically opposed. This allows for better mechanical balance of the rotor 1, particularly on the dynamic level.

[0045] A first electrical line 30 runs through the longitudinal body 13 of the longitudinal portion 11 inside from the first ring 17 towards the proximal end 16, and passes through the first body 28 of the first radial portion 12.

[0046] More specifically, the first line 30 comprises a longitudinal section 31, consisting for example of the first conductive ring 17, an electrically conductive wire 32, and a terminal 33. The ring 17, the wire 32 and the terminal 33 are successively secured by means such as welding, crimping, forced contacts, or the like. The material constituting the longitudinal body 13 is molded so as to contain the section 31, leaving the first ring 17 visible, and leaving the terminal 33 to project longitudinally at the proximal end 16.

[0047] The first line 30 also comprises a radial section 34, consisting for example of a terminal 35 and an electrically conductive wire 36. Here again, the terminal 35 and the wire 36 are secured by means such as welding, crimping, forced contact, or the like. The material constituting the first radial part 12 is molded so as to contain the section 34, leaving the terminal 35 to project radially at the proximal end 16, at the boundary between the first zone 4 and the winding zone 5 of the shaft 3, and leaving a portion of the wire 36 to project for connection to the winding.

[0048] Similarly, a second electrical line runs through the longitudinal body 13 of the longitudinal portion 11 inside from the second ring 18 towards the proximal end 16, and passes through the second body of the second radial portion. The second line comprises a longitudinal section, consisting for example of the second conductive ring 18, an electrically conductive wire, and a terminal, the latter two elements not being visible in the figure. The terminal projects longitudinally at the proximal end 16. The second line also comprises a radial section, consisting for example of a terminal and an electrically conductive wire.The material constituting the second radial part is molded so as to contain the section, leaving the lug to protrude radially at the proximal end 16, at the boundary between the first zone 4 and the winding zone 5 of the shaft 3, and leaving a portion of the wire to protrude for connection to the winding.

[0049] The transmission module 10 is placed on the shaft 3, for example, by a method which consists of placing the first radial part 12 in the dedicated cavity 29 of the shaft 3, placing the second radial part in the dedicated cavity of the shaft 3, then placing the longitudinal part 11 in the longitudinal cavity 25 of the shaft 3, so that the lugs 33 of the longitudinal sections 31 of the first line 30 and of the second line are respectively in contact by longitudinal support on the lugs 35 of the radial sections 34 of the first line 30 and of the second line.

[0050] A seal is provided between the longitudinal part 11 of the transmission module 10 and the first zone 4 of the shaft 3 of the rotor 1. For example, a first O-ring 41 and a second O-ring 42 are arranged around the longitudinal body 13 in the longitudinal cavity 25 of the shaft 3. The seals are spaced from each other and located near the free end 26. It is possible to grease the space between the seals 41, 42, to facilitate the positioning of the longitudinal body 13 in the cavity 25, and to reinforce the seal.

[0051] A seal is also provided between the shaft 3 of the rotor 1 and the stator 2. For example, a dynamic seal 43 is arranged around the first zone 4 of the shaft 3, on the side of the bearing 6 opposite the winding zone 5.

[0052] In addition, an elastic ring 44 is located between an outer ring 45 of the bearing 6 and the stator 2, to reduce or eliminate axial mechanical clearances between the rotor 1 and the stator 2.

[0053] The second embodiment of the invention is shown in Figure 2. In particular, we find the rotor 1 and the stator 2 seen from the front.

[0054] What is specific to the second form is the structure of the transmission module 50. This comprises a longitudinal part 51, a first radial part 52 and a second radial part not shown, the parts being separate pieces. The longitudinal part 51 comprises a longitudinal insulating body 53 of axis L53, extending between a distal end 55 and a proximal end 56, and carrying a first conductive ring 57 and a second conductive ring 58.

[0055] The first radial portion 52 comprises a first insulating body 68 housed in a first radial cavity 69 of the shaft 3. Similarly, the second radial portion comprises a second insulating body housed in a second radial cavity of the shaft 3.

[0056] The transmission module 50 comprises a first electrical line 70. A longitudinal section 71 of the latter comprises the first conductive ring 57, a wire 72, and a terminal 73. A radial section 74 of the first line 70 comprises a terminal 75, an electrical wire 76, and an elastic means 77 arranged between the wire 76 and the terminal 75. In a non-limiting manner, the elastic means 77 is produced in the form of a spring.

[0057] The transmission module 50 also comprises a second electrical line. A longitudinal section of the latter comprises the second conductive ring 58, a wire, and a terminal. A radial section of the second line comprises a terminal, an electrical wire, and an elastic means disposed between the wire and the terminal. In a non-limiting manner, the elastic means is in the form of a spring.

[0058] The radial section 74 of the first line 70 and the radial section of the second line each protrude at the proximal end 56, to bear respectively in a radial direction on the longitudinal section 71 of the first line 70 and on the longitudinal section of the second line.

[0059] The lug 75 of the radial section 74 of the first line 70 and the lug of the radial section of the second line are respectively elastically biased towards the longitudinal section 71 of the first line 70 and towards the longitudinal section of the second line.

[0060] An elastic stress exerts a mechanical braking effect at the same time as a continuity of electrical line.

[0061] The third embodiment of the invention is presented in Figures 3 and 4. We still see the rotor 1 and the stator 2 seen before.

[0062] What is specific to the third form is the structure of the transmission module 80. This comprises a longitudinal part 81, a first radial part 82 and a second radial part not shown, the parts being separate pieces.

[0063] The longitudinal portion 81 comprises an insulating longitudinal body 83 of axis L83, extending between a distal end 85 and a proximal end 86, and carrying a first conductive ring 87 and a second conductive ring 88.

[0064] The first radial portion 82 comprises a first insulating body 98 housed in a first radial cavity 99 of the shaft 3. Similarly, the second radial portion comprises a second insulating body housed in a second radial cavity of the shaft 3.

[0065] The transmission module 80 comprises a first electrical line 100. A longitudinal section 101 of the latter comprises the first conductive ring 87, a wire 102, and a terminal 103. A radial section 104 of the first line 100 comprises an electrical wire 106. A seal 107, disposed between the radial portion 82 and the longitudinal portion 81, holds the radial portion 82 in place relative to the longitudinal portion 81. In a non-limiting manner, the seal 107 is toroidal in shape. A tab 108 is inserted into the longitudinal body 83, in contact with the terminal 103, to hold the latter during the installation of the first radial part 82. The wire 106 makes contact with the terminal 103, at the level of a cavity 109 of the tab 108. In addition, a tab 110 holds the first radial part 82 in the first radial cavity 99.

[0066] The transmission module 80 also comprises a second electrical line. A longitudinal section of the latter comprises the second conductive ring 88, a wire, and a terminal. A radial section of the second line comprises an electrical wire. A seal, disposed between the radial portion and the longitudinal portion 81, holds the radial portion in place relative to the longitudinal portion 81. In a non-limiting manner, the seal is toroidal in shape. A tab is inserted into the longitudinal body 83, in contact with the terminal, to hold the latter when the second radial portion is put in place. The wire makes contact with the terminal, at a cavity in the tab. In addition, a tab holds the second radial portion in the second radial cavity.

[0067] The fourth embodiment of the invention is presented with the aid of Figure 5. According to this form, a transmission module 120 comprises a longitudinal part 121, a first radial part 122 and a second radial part which form a single piece, in which a first line 130 and a second line are retained. In this case, the manufacture of the module 120 is simpler.

[0068] A first zone 134 of a shaft 133 is attached to a winding zone 135, a longitudinal cavity 145 of the shaft 133 having an internal surface of revolution 147, and a sealing means 151, 152 being provided between an external surface of revolution 154 of a longitudinal body 163 of the longitudinal part 121 and the internal surface of revolution 147 of the longitudinal cavity 145 of the shaft 3. The invention is not limited to the embodiments described, and includes all equivalents which may fall within the scope of the claims which follow.

Claims

CLAIMS 1. Rotor (1) comprising a transmission module (10, 50, 80, 120) between a power source and a winding, the transmission module (10, 50, 80, 120) comprising a longitudinal portion (11, 51, 81, 121), a first radial portion (12, 52, 82, 122) and a second radial portion, the longitudinal portion (11, 51, 81, 121) comprising an insulating longitudinal body (13, 53, 83, 163), the first radial portion (12, 52, 82, 122) comprising a first insulating body (28, 68, 98), the second radial portion comprising a second insulating body, a first electrical line (30, 70, 100, 130) running through the longitudinal body (13, 53, 83, 163) of the longitudinal part (11, 51, 81, 121) inside, and passing through the first body (28, 68, 98) of the first radial part (12, 52, 82, 122), a second electrical line running through the longitudinal body (13, 53, 83, 163) of the longitudinal part (11, 51, 81, 121) inside,and passing through the second body of the second radial part, characterized in that the longitudinal part (11, 51, 81), the first radial part (12, 52, 82) and the second radial part are separate pieces, a longitudinal section (31, 71, 101) of the first line (30, 70, 100) and a longitudinal section of the second line being retained in the longitudinal body (13, 53, 83), a radial section (34, 74, 104) of the first line (30, 70, 100) being retained in the first body (28, 68, 98), and a radial section of the second line being retained in the second body, or in that the longitudinal part (121), the first radial part (122) and the second radial part form a single piece in which the first line (130) and the second are retained line., 2. Rotor (1) according to claim 1, wherein, when the longitudinal part (11, 51, 81), the first radial part (12, 52, 82) and the second radial part of the transmission module (10, 50, 80) are separate parts, a first zone (4) and a winding zone (5) of a shaft (3) form a single-piece subdivision, a longitudinal cavity (25) of the shaft (3) has an internal surface of revolution (27), and a sealing means (41, 42) is provided between a external surface of revolution (14) of the longitudinal body (13) and the internal surface of revolution (27) of the longitudinal cavity (25) of the shaft (3).

3. Rotor (1) according to claim 2, for which the longitudinal section (31) of the first line (30) and the longitudinal section of the second line each project at a proximal end (16), in a direction away from a distal end (15), to bear respectively in a longitudinal direction on the radial section (34) of the first line (30) and on the radial section of the second line.

4. Rotor (1) according to claim 3, for which a lug (33) of the longitudinal section (31) and a lug (35) of the radial section (34) of the first line (30) are in contact, and in which a lug of the longitudinal section and a lug of the radial section of the second line are in contact.

5. Rotor (1) according to claim 2, wherein the radial section (74, 104) of the first line (70, 100) and the radial section of the second line each protrude at a proximal end (56, 86), to bear respectively in a radial direction on the longitudinal section (71, 101) of the first line (70, 100) and on the longitudinal section of the second line.

6. Rotor (1) according to claim 5, for which a lug (75) of the radial section (74) of the first line (70) and a lug of the radial section of the second line are respectively elastically biased towards the longitudinal section (71) of the first line (70) and towards the longitudinal section of the second line.

7. Rotor (1) according to claim 5, for which a lug of the radial section (104) of the first line (100) and a lug of the radial section of the second line are respectively fitted in a first cavity (109) of the longitudinal section (101) and in a second cavity of the longitudinal section.

8. Rotor (1) according to claim 1, for which, when the longitudinal part (121), the first radial part (122) and the second radial part form a single piece, a first zone (134) of a shaft (133) is attached to a winding area (135), a longitudinal cavity (145) of the shaft (133) having an internal surface of revolution (147), and a sealing means (151, 152) being provided between an external surface of revolution (154) of the longitudinal body (163) and the internal surface of revolution (147) of the longitudinal cavity (145) of the shaft (133).

9. Electrical machine comprising a rotor (1) according to one of claims 1 to 8.

10. Vehicle comprising an electric machine according to claim 9.

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