Rotating electric machine rotor

Abstract

Rotating electric machine rotor Wound rotor (1) of rotating electric machine, comprising: - a shaft (5) extending along a longitudinal axis (X), - a plurality of attached salient poles (3a, 3b), in particular an even number of salient poles, for example four salient poles, each salient pole (3a, 3b) comprising a pole body (4) having a free end (4a) intended to face a stator and a proximal end (4b) intended to cooperate with the shaft, at least one first salient pole (3a) comprising on either side of its proximal end (4b) fixed hooks (11), and at least one second salient pole (3b) comprising on either side of its proximal end (4b) movable hooks (12), each movable hook of a second salient pole being intended to cooperate with a fixed hook of a first salient pole. Figure for the abstract: Fig. 1a

Description

Title of the invention: Rotating electric machine rotor technical field

[0001] The present invention relates to rotating electrical machine rotors, and more particularly but not exclusively, wound rotors of industrial alternators, also called pole wheels, in particular having salient poles attached, as well as the manufacturing process of such rotors. Previous technique

[0002] It is known to produce rotors with a certain sectorization and assembly of poles.

[0003] In US patent application 2016 / 0056676, the motor rotor consists, on the one hand, of sheet metal that includes the hub and part of the pole bodies with their pole flares, and on the other hand, of a plurality of attached poles that comprise only the pole bodies with their pole flares. The attached poles are joined to the hub by alternating tenons and mortises through which a locking pin passes. Given the geometry of the elements to be cut, it is not possible to reduce the amount of material scrap.

[0004] In US patent 1 608 314, there is also an alternation of tenons and mortises through which a locking pin passes to assemble rotor poles together.

[0005] Finally, in patent application DE 10 2019203291 A1, the rotor consists of a hub and several attached poles. The poles are attached to the hub by alternating tenons and mortises locked by pins.

[0006] However, the mortise and tenon joint system has the disadvantage of introducing play in the manufacturing dimensions to allow the multiple tenons to penetrate the mortises. Introducing multiple areas of play between the constituent elements of a rotor is undesirable, as this play can impede the flow of magnetic flux, reduce the dimensional and geometric quality of the assembly, and decrease the rotor's stability during machine operation.

[0007] There is therefore a need to further improve rotating electrical machine rotors having added salient poles, and to simplify and facilitate their manufacture. Description of the invention

[0008] The invention aims to meet this need and achieves this, in one of its aspects, by means of a wound rotor of a rotating electrical machine, comprising: - a shaft extending along a longitudinal axis X, - a plurality of reported salient poles, in particular an even number of salient poles, for example four salient poles, each salient pole comprising a pole body having a free end intended to face a stator and a proximal end intended to cooperate with the shaft, at least one first salient pole having fixed hooks on either side of its proximal end, and at least one second salient pole having movable hooks on either side of its proximal end, each movable hook of a second salient pole being intended to cooperate with a fixed hook of a first salient pole.

[0009] The present invention can be applied to a rotating electrical machine rotor, having a rotation speed in particular between 1 and 10,000 revolutions per minute for example, for a power supplied between 0 and several MW, for example on the order of 2 MW.

[0010] A rotor magnetic mass with salient poles is arranged on the shaft, which extends along the longitudinal axis X. The shaft is designed to drive the rotor as a whole in rotation about the longitudinal axis X. The shaft may be made of a magnetic material, thereby improving the electromagnetic performance of the rotor. Alternatively, the rotor has a non-magnetic shaft. The shaft may be made, at least in part, of a material from the following non-limiting list: steel, stainless steel, titanium, or any other non-magnetic material.

[0011] The term 'reported salient poles' means that each salient pole is separated from the other salient poles, with a plurality of salient poles each lacking any material connection with the other salient poles. The rotor is said to be sectorized.

[0012] The 'proximal end' of a salient pole means the end of said salient pole opposite its free end. The proximal end is configured to cooperate with the rotor shaft.

[0013] The rotor may have at least two salient poles, in particular an even number of salient poles, for example two or four salient poles. The rotor may have exactly four salient poles.

[0014] Two consecutive salient poles form a rotor slot between them. The rotor may have a plurality of slots, in particular an even number of slots, for example four rotor slots.

[0015] The rotor further comprises at least one coil per salient pole. Each coil surrounds the pole body of the corresponding salient pole. The rotor coils can be arranged in a concentrated manner around the corresponding salient pole, i.e., each coil can be wound around a single salient pole of the rotor. The coils can be inserted separately or simultaneously.

[0016] The coils include electrical conductors. The electrical conductors may have a circular or flattened cross-section, but preferably a polygonal one, particularly rectangular. This allows for a larger contact area with a hypothetical wedge.

[0017] Each coil may include at least one wire wound around the pole. The wire may have a flat cross-section, for example rectangular or substantially rectangular, or alternatively be circular. The wire may be made of copper.

[0018] When the conductors have a circular cross-section, they can be arranged in a hexagonal stack. When the conductors have a flattened cross-section, they can be arranged in one or more rows. Optimizing the stack can allow for a greater number of electrical conductors, thus resulting in a higher power rotor for a constant volume. A coil can contain one or more rows of electrical conductors, for example, one, two, three, or four rows.

[0019] Each salient pole may have two polar flares, each disposed on either side of the pole body at a free end of the pole body.

[0020] Each first salient pole may have at its proximal end two fixed hooks, in particular one fixed hook on each side of its proximal end.

[0021] Each second salient pole may have at its proximal end two movable hooks, in particular a movable hook on each side of its proximal end.

[0022] A movable hook of a second salient pole can cooperate with a fixed hook of a first salient pole located consecutively to said second salient pole, when moving around the axis of rotation X of the rotor. The other movable hook of said second salient pole can cooperate with a fixed hook of a first salient pole located consecutively to said second salient pole, when moving around the axis of rotation X of the rotor, on the other side of said second salient pole.

[0023] The configuration of the salient poles according to the invention allows each salient pole to be cut independently of the other salient poles. Each salient pole can, for example, be cut from a strip of material following the previous salient pole, without any connection between them.

[0024] In the strip of material, two consecutive salient poles can be nested. They can, for example, be arranged head-to-tail.

[0025] The material strip can have a width corresponding approximately to the length of a salient pole, which is much smaller than the largest dimension of the rotor. The material strip used can thus be more manageable and less expensive than a material strip from which the entire rotor mass would be cut. Consequently, the material waste rate, corresponding to the material not used for the rotor relative to the total material in the strip, is significantly reduced. It can be less than 20%, whereas it can reach 40% when the rotor mass is cut out in its entirety. Thus, the invention reduces the amount of material required to manufacture the rotor's magnetic circuit. The cutting waste rate is reduced without the need for additional parts such as a locking pin. The rotor according to the invention can, in particular, be free of tenons and mortises and a locking pin.

[0026] The invention can also facilitate the winding of the rotor's salient poles by improving access to the proximal end of each salient pole. The rotor slot filling rate can also be improved.

[0027] The fixed and mobile hooks according to the invention make it possible to assemble the added salient poles, and to remedy the fact that they were manufactured separately from each other, without any material bonding between them.

[0028] This assembly advantageously allows the resulting rotor to meet the dimensional and geometric requirements equivalent to a rotor whose salient poles would be cut from a single piece, and that the rotor resists the stresses to which it is subjected during the operation of the machine and its rotation, in particular centrifugal effects.

[0029] Thanks to the invention, a significant reduction in cutting waste is obtained, easy reconstitution of the rotor mass, good rotor geometry, mechanical resistance capable of withstanding stresses during operation, and this without having added a part compared to a classic assembly of complete sheets to the rotor. Summary of the invention Rotor

[0030] The plurality of salient poles may include an alternation of first salient poles and second salient poles. The first salient poles may be arranged alternately with the second salient poles when moving around the longitudinal axis X of the rotor. A first salient pole may be surrounded by two second salient poles. A second salient pole may be surrounded by two first salient poles.

[0031] Each first protruding pole may have notches on either side of its proximal end above the fixed hooks. A notch may, in particular, be substantially triangular in shape. Each first protruding pole may have two notches, one on each side of the first protruding pole, each above the corresponding fixed hook. The notches are located further from the proximal end of the protruding pole than the fixed hooks. The notches are formed in the sides of the pole body. The sides of the pole body may extend parallel to each other.

[0032] A notch can be defined by two edges of the notch, a first edge of the notch extending substantially perpendicularly, in particular perpendicularly, to a polar axis of the corresponding salient pole and a second edge of the notch extending obliquely with respect to the polar axis Y, in particular with an angle of about 45° with respect to the perpendicular to a polar axis of the corresponding salient pole.

[0033] The first edge can be inclined at an angle of a few degrees with respect to the perpendicular to a polar axis of the corresponding salient pole, the inclination being oriented towards the longitudinal axis X of the rotor, in particular with an angle between 5° and 10° with respect to the perpendicular to the polar axis Y. The inclination can be on the order of 5° to 10°, being for example about 6°.

[0034] The second edge can form an angle of approximately 45° with respect to the perpendicular to the polar axis. Thus, an angular opening of the notch can be less than 45°, in particular between 35° and 45°, in particular being on the order of 39°.

[0035] The notch may be intended to receive a projection of a second pole adjacent to the first protruding pole.

[0036] Each second protruding pole may have projections on either side of its proximal end on either side of the movable hooks, a projection being in particular substantially triangular in shape.

[0037] A projection can be defined by two edges of the projection, a first edge of the projection extending substantially parallel to a polar axis of the corresponding salient pole and a second edge of the projection extending obliquely with respect to the polar axis. The angles of the edges of this projection can preferably be complementary to those formed by the edges of the notch of the first salient pole described above.

[0038] The first edge of the projection can be inclined at an angle of a few degrees with respect to a polar axis Y of the corresponding salient pole, the inclination being oriented towards the longitudinal axis X of the rotor, in particular with an angle between 5° and 10° with respect to the polar axis Y. The inclination can be on the order of 5° to 10°, being for example about 6°.

[0039] The second edge of the projection can form an angle of approximately 45° with respect to the polar axis.

[0040] The projection of a second pole may extend substantially parallel to a polar axis of the second pole. The projection of a second pole may extend one side of the pole body of said second pole, said side extending parallel to the polar axis.

[0041] Each second protruding pole may have cutouts on either side of its proximal end on either side of the movable hooks, one cutout being intended to receive a fixed hook.

[0042] A cutout in a second protruding pole may be formed between a movable hook and a projection. A second protruding pole may have at its proximal end two movable hooks in a central position, which are surrounded by two cutouts, themselves surrounded by the two projections.

[0043] The movable hooks can be connected by a thinned portion to the pole body of the corresponding second salient pole. The thinned portion ensures the mobility of the corresponding movable hook and its rotation relative to the pole body. The rotation occurs when the salient poles are mounted on each other and on the shaft. The thinned portion can be specially designed to allow its rotation under a predefined force. The movable hooks can thus assume a so-called 'closed' position of cooperation with the fixed hooks of the first salient pole(s), which allows them to become embedded in the first adjacent salient poles.

[0044] Before rotation, the movable hooks of the second salient pole protrude into the rotor bore. This position corresponds to their open state, resulting from the cutting of the material strip. After rotation, the movable hooks no longer protrude into the bore and are positioned so as not to hinder the insertion of the shaft into the bore.

[0045] A movable hook, or even all the movable hooks, may have a back that complements the bore of the rotor in a position of cooperation with a fixed hook of a first salient pole.

[0046] The movable hooks can be clamped by the shaft in a position that cooperates with the fixed hooks of the first salient pole(s). Clamping the movable hooks by the shaft ensures good stability of the rotor and the position of the first and second salient poles. Indeed, the presence of the shaft in the central bore of the rotor mass allows the rotor to withstand the significant stresses to which it is subjected during machine operation.

[0047] Thus, the final locking and mechanical resistance of the rotor will be obtained when the shaft is introduced into the bore, because it opposes the reopening of the movable hooks.

[0048] The fixed hooks and the movable hooks may have a corresponding hooked shape, so as to ensure their cooperation. A fixed hook and a movable hook may be configured so as to interlock with each other.

[0049] The interlocking of the first and second salient poles during the cutting of the material strip significantly reduces cutting waste. Compared to stripping a complete rotor sheet, material consumption can be reduced by approximately 25%. There is a complementary geometry between the first salient poles with fixed hooks and the second salient poles with movable hooks.

[0050] The salient poles can be formed by an assembly of magnetic sheets, in particular identical magnetic sheets. Each salient pole can comprise a stack of magnetic sheets. Each sheet can be cut from a sheet of magnetic steel, for example, steel 0.1 to 1.5 mm thick. The sheets can be coated with an electrically insulating varnish on their opposite faces before being assembled in the stack. Insulation can also be achieved by heat-treating the sheets.

[0051] The rotor may include tie rods for securing the magnetic laminations. The rotor mass may have one or more holes to lighten the rotor, allow for its balancing, or for assembling the constituent rotor laminations. Holes may allow the passage of tie rods that hold the laminations together. Alternatively, the rotor may not have such retaining tie rods. Machine

[0052] The invention also relates, independently or in combination with the foregoing, to a rotating electrical machine comprising a rotor as defined above. The machine may be an alternator, or alternatively a motor.

[0053] The machine may include a stator inside which the rotor rotates. The stator is a hollow cylinder into which the rotor is inserted. It may have slots distributed on its inner surface, facing the rotor, for receiving the electrical conductors for the induction mechanism. These slots may be radially equidistant when the electrical machine is viewed transversely.

[0054] The rotating electrical machine may include a cooling circuit, in which a cooling fluid may circulate. The cooling fluid may, for example, be air. The cooling fluid may circulate in cooling channels of the cooling circuit, which may be located in interpolar regions. The machine may include an air-cooled circuit.

[0055] The machine may include one or two fans for forcing air circulation in the cooling channels. This fan or these fans may be driven by the rotor to create forced air circulation in the cooling channels if the chosen embodiment so provides.

[0056] The cooling circuit may, for example, also include an external water jacket, in order to cool the air circulating in the rotor.

[0057] The machine can be multiphase. The rotating electrical machine can have a rotational speed between 1 and 10,000 rpm, preferably between 100 and 8,000 rpm, or even between 1,000 and 5,000 rpm; for example, the rotational speed is 1,500 rpm. Manufacturing process

[0058] The invention also relates to a method for manufacturing a rotor as described above. In particular, the invention relates to a method for manufacturing a rotor in which the first and second salient poles are arranged on an assembly tool configured to allow the salient poles to converge towards the longitudinal axis X of the rotor.

[0059] Thus, the mounting tool allows the salient poles to converge towards each other. The mounting tool is configured to allow the alignment of the salient poles and then their movement in the direction of the longitudinal axis X.

[0060] The mounting tool may comprise a plurality of support parts, in particular at least two, for example four support parts. Each support part may be configured to receive a salient pole and push it towards the longitudinal axis X.

[0061] In one embodiment, the second salient poles begin to converge towards the longitudinal axis X before the first salient poles. This facilitates the insertion of the fixed hooks onto the movable hooks.

[0062] Alternatively, the first salient poles begin to converge towards the longitudinal axis X before the second salient poles.

[0063] In one embodiment, the final position of the first salient poles with fixed hooks is reached before the second salient poles with movable hooks. Thus, the second salient poles begin their movement toward the longitudinal axis X before the first salient poles, and they complete their movement toward the longitudinal axis X after the first salient poles. The mounting tool can be configured to allow the movement of the first salient poles to occur more rapidly than the movement of the second salient poles.

[0064] The geometry of the fixed hooks and the movable hooks is designed in such a way that the convergence of the salient poles can take place without interference between the poles, up to the final position.

[0065] Thus, in a first step (a) of the rotor manufacturing process, the salient poles are brought together and placed in their final position around the longitudinal axis X. The salient poles can, at the end of this step (a), be firmly pressed together, in particular by the fixed hooks of the first salient poles inserted into the corresponding cutouts of the second salient poles, and in particular by the projections of the second salient poles inserted into the notches of the first salient poles.

[0066] The movable hooks can then be moved to cooperate with the corresponding fixed hooks, in particular by using a mandrel inserted into the bore formed by the salient poles. The mandrel can be inserted into the bore at one end in a step (b), while at the other end the periphery of the bore rests against a holding tool. The mandrel can be cylindrical.

[0067] The chuck may have a plurality of branches, in particular at least two, and in particular four, grooves, each forming a slope with respect to the longitudinal axis X. The chuck may have as many grooves as it has protruding poles. A cross-section of the chuck may, due to the inclination of the grooves with respect to the longitudinal axis X, have an increasing surface area as one moves from a first end of the chuck to its second end, opposite the first end. The chuck may be configured to be inserted into the bore by its first end.

[0068] Thus, the mandrel can be inserted into the bore, and as it is driven further into the bore, the mandrel allows the movable hooks to be positioned on the fixed hooks. To this end, the inclined grooves gradually press against the movable hooks, causing them to rotate and bending the thinned portion of the movable hooks.

[0069] Thanks to this shape, at the beginning of its insertion, the chuck engages with the movable hooks, which then position themselves in the grooves. Thus, the chuck centers itself in the bore. As it is driven in, the bottom of the chuck's grooves gradually pushes the movable hooks to pivot on their thinned portion and move into the closed position, cooperating with the fixed hooks. At the end of its travel, the chuck allows the complete shaping of the rotor bore.

[0070] In this embodiment, all the movable hooks are put in place simultaneously, which is advantageous for ensuring the symmetry and balance of the rotor.

[0071] In the continuation of its insertion, the mandrel can be driven out by the introduction of another mandrel intended for example to hold the rotor during the winding stage, or by the rotor shaft in the case where the winding is done with the shaft in place.

[0072] The pole mounting tool can be equipped with drawers; in particular, each support part can have one or two drawers, one for each movable hook. The drawers can be arranged on the support part at its base, under the corresponding protruding pole, so as to support the movable hooks.

[0073] The slides may initially protrude into the rotor bore and support the movable hooks in the longitudinal direction. Subsequently, the slides may gradually retract, notably by radial translation, as the chuck encounters them. At the end of the chuck's movement, the slides may be completely pushed back by the chuck and no longer protrude into the rotor bore.

[0074] Such a configuration can compensate for a thrust along the longitudinal axis X exerted during the chuck insertion step by the bottom of the grooves on the movable hooks. The effect of such a thrust in this longitudinal direction is undesirable since it could lead to sagging of the hooks. mobile, whereas only rotational movement in the transverse plane is desired. The drawers support the movable hooks during longitudinal thrust.

[0075] In a step (c), the rotor is then wound.

[0076] Alternatively, and if necessary, one or more of the protruding poles may have a lug or groove in the area of ​​the central bore, particularly one that is substantially rectangular in shape. The lug or groove may allow a connection with the rotor shaft. This keyed connection with the shaft provides greater torque resistance. Brief description of the drawings

[0077] The invention will be better understood upon reading the detailed description that follows, a non-limiting example of its implementation, and upon examination of the accompanying drawing, in which:

[0078] [Fig. la] The [Fig. la] is a schematic and partial cross-sectional view of a rotor according to the invention.

[0079] [Fig.lb] The [Fig.lb] is a detail view of the [Fig.la].

[0080] [Fig. 2a] Fig. 2a is a schematic and partial cross-sectional view of a first salient pole of the rotor of the [Fig.la].

[0081] [Fig. 2b] Fig. 2b is a schematic and partial cross-sectional view of a first salient pole of the rotor of the [Fig.la].

[0082] [Fig. 3a] Fig. 3a is a schematic and partial cross-sectional view of a second salient pole of the rotor of the [Fig. 1a].

[0083] [Fig. 3b] Fig. 3b is a schematic and partial cross-sectional view of a second salient pole of the rotor of the [Fig. 1a].

[0084] [Fig.4] Fig.4 illustrates the assembly of the first and second salient poles.

[0085] [Fig.5] The [Fig.5] illustrates the cutting of the first and second salient poles.

[0086] [Fig. 6a] Figure [Fig. 6a] illustrates step (a) of the rotor manufacturing process of the [Fig. la],

[0087] [Fig. 6b] [Fig. 6b] illustrates the continuation of step (a) of the rotor manufacturing process of the [Fig.la].

[0088] [Fig.6c] Fig.6c is a detailed view of it.

[0089] [Fig. 7a] Fig. 7a illustrates the mandrel used in step (b) of the process of manufacturing of the rotor of the [Fig.la].

[0090] [Fig.7b] Fig.7b illustrates step (b) of the manufacturing process.

[0091] [Fig.7c] Fig.7c illustrates the end of step (b) of the manufacturing process.

[0092] [Fig.7d] Fig.7d illustrates the use of drawers in step (b) of the process of manufacturing.

[0093] [Fig-8] The [Fig.8] is a schematic and partial cross-sectional view of variant embodiments of first salient poles. Detailed description

[0094] Figures 1a to 3b illustrate a rotor 1 of a rotating electrical machine according to the invention. The machine comprises the rotor 1 and a stator (not shown), separated by an air gap. The stator is a hollow cylinder in which the rotor 1 is housed. The rotor 1 is mounted on a shaft 5 that rotates about a longitudinal axis X, while the stator is fixed relative to a housing (not shown).

[0095] The rotor 1 comprises a plurality of attached salient poles 3a, 3b, forming the rotor mass, in particular in this example four salient poles 3a, 3b, as illustrated in [Fig. 1a]. Each salient pole comprises a pole body 4 having a free end 4a intended to face the stator and a proximal end 4b intended to cooperate with the shaft 5. Each salient pole 3a, 3b comprises two pole flares 6, each arranged on either side of the pole body 4 at a free end 4a of the pole body. Two consecutive salient poles 3a, 3b form a rotor slot 7 between them. The rotor 1 thus comprises four rotor slots 7. The rotor further comprises at least one coil per salient pole, not shown.

[0096] The plurality of salient poles reported 3a, 3b comprises an alternation of first salient poles 3a and second salient poles 3b, when moving around the longitudinal axis X of the rotor.

[0097] The plurality of salient poles 3a, 3b comprises two first salient poles 3a having fixed hooks 11 on either side of its proximal end. Each first salient pole 3a has two fixed hooks 11 at its proximal end 4b, with one fixed hook on each side of its proximal end, as illustrated in Figure 2.

[0098] The plurality of salient poles 3a, 3b comprises two second salient poles 3b having on either side of its proximal end 4b two movable hooks 12, with a movable hook 12 on each side of its proximal end, as illustrated in Figure 3. Each movable hook 12 of a second salient pole 3b is intended to cooperate with a fixed hook 11 of a first salient pole 3a, as illustrated in [Fig. 4].

[0099] The configuration of the salient poles according to the invention allows each salient pole to be cut independently of the other salient poles. Each salient pole can, for example, be cut from a strip of material following the preceding salient pole, without any connection between them, as illustrated in [Fig. 5]. In the strip of material, two consecutive salient poles are nested, being arranged head-to-tail.

[0100] Each first protruding pole 3a has two notches 13 on either side of its proximal end 4b above the fixed hooks 11, one on each side of the first protruding pole 3a, each above the corresponding fixed hook. The notches 13 are further from the proximal end 4b of the protruding pole 3a than the fixed hooks 11.

[0101] Notches 13 are formed in the sides of the pole body 4. A notch is substantially triangular in shape, being defined by two edges of the notch. A first edge 13a of the notch extends substantially perpendicularly to a polar axis of the corresponding salient pole 3a, being inclined at an angle al of a few degrees to the perpendicular to the polar axis of the corresponding salient pole, the inclination being oriented towards the longitudinal axis X of the rotor, with an angle al of approximately 6° to the perpendicular to the polar axis. A second edge 13b of the notch extends obliquely to the perpendicular to the polar axis Y, in particular with an angle

[31] of approximately 45° to the perpendicular to the polar axis.

[0102] The lower face of a fixed hook can form an angle a3 with the perpendicular to the polar axis Y, in particular with an angle a3 between 5° and 10°, being for example about 6°.

[0103] The notch 13 is intended to receive a projection 14 of a second pole 3b adjacent to the first pole 3a, as illustrated in [Fig.lb].

[0104] Each second protruding pole 3b has two projections 14 on either side of its proximal end 4b on either side of the movable hooks 12. The projection 14 of a second pole 3b extends substantially parallel to a polar axis Y of the second pole 3b. It extends one side of the pole body 4 of said second pole 3b.

[0105] A projection 14 is substantially triangular in shape, being defined by two edges of the projection, a first edge 14a of the projection extending substantially parallel to a polar axis of the corresponding salient pole, being inclined at an angle a2 of a few degrees with respect to a polar axis Y of the corresponding salient pole, the inclination being oriented towards the longitudinal axis X of the rotor, in particular with an angle a2 of the order of about 6° with respect to the polar axis Y. A second edge 14b of the projection extends obliquely with respect to the polar axis, in particular with an angle [32 of the order of 45° with respect to the polar axis.

[0106] In addition, each second protruding pole 3b has cutouts 15 on either side of its proximal end 4b on either side of the movable hooks 12, being provided between a movable hook 12 and a protrusion 14. A cutout 15 is intended to receive a fixed hook 11. The edges of the cutout can respectively form angles a2 and a4 with the polar axis Y, which can each be between 5° and 10°, being for example about 6°.

[0107] The movable hooks 12 are connected by a thinned portion 16 to the pole body 4 of the corresponding second salient pole 3b. The thinned portion 16 ensures the mobility of the corresponding movable hook 12, and its rotation relative to the pole body 4.

[0108] Before rotation, the movable hooks 12 of the second salient pole protrude into the rotor bore, as illustrated in [Fig. 4]. After rotation, the movable hooks 12 no longer protrude into the bore and are positioned so as not to hinder the insertion of the shaft into the bore, as illustrated in [Fig. 1a]. A movable hook 12 has a back 12a that completes the rotor bore in a position of cooperation with a fixed hook 11 of a first salient pole. The movable hooks 12 are held by the shaft in a position of cooperation with the fixed hooks 11 of the first salient poles 3a.

[0109] The salient poles are formed by an assembly of identical magnetic sheets. Each sheet can be cut from a sheet of magnetic steel, for example steel 0.1 to 1.5 mm thick, as illustrated in [Fig. 5].

[0110] We will now describe the manufacturing process of the rotor as described above.

[0111] In a first step (a), the first and second salient poles 3a, 3b are placed on a mounting tool 20 configured to allow the salient poles 3a, 3b to converge towards the longitudinal axis X of the rotor, in order to bring the salient poles 3a, 3b closer together and into their final position around the longitudinal axis X, as illustrated in [Fig. 6a]. In this example, the mounting tool 20 comprises four support parts 21. Each support part 21 is configured to receive a salient pole 3a or 3b and push it towards the longitudinal axis X.

[0112] The second salient poles 3b begin to converge towards the longitudinal axis X until the end of the projections 14 are aligned with the sides of the pole bodies of the first salient poles 3a. This makes it easier to insert the fixed hooks onto the movable hooks and then rotate the movable hooks onto the fixed hooks, as illustrated in Figures 6b and 6c.

[0113] The final position of the first salient poles 3a with fixed hooks 11 is reached before the second salient poles 3b with movable hooks 12. Thus, the second salient poles 3b begin their movement towards the longitudinal axis X before the first salient poles 3a, and they complete their movement towards the longitudinal axis X after the first salient poles 3a. The mounting tool 20 can be configured to allow the movement of the first salient poles 3a to occur more rapidly than the movement of the second salient poles 3b.

[0114] The protruding poles 3a, 3b are, at the end of this step (a), firmly pressed together, in particular by the fixed hooks 11 of the first protruding poles 3a inserted into the corresponding cutouts 15 of the second protruding poles 3b, as well as by the projections 14 of the second protruding poles 3b inserted into the notches 13 of the first protruding poles 3a.

[0115] In a second step (b), the movable hooks 12 are then moved to cooperate with the corresponding fixed hooks 11, using a mandrel 30 inserted into the bore formed by the salient poles 3a, 3b. The mandrel 30 is inserted into the bore by a first end 30a, while at the other end 30b the periphery of the bore is supported by a holding tool not shown.

[0116] Furthermore, the chuck 30 has four grooves 31, each forming a slope with respect to the longitudinal axis X, as illustrated in [Fig. 7a]. A cross-section of the chuck has, due to the inclination of the grooves with respect to the longitudinal axis X, an increasing surface area as one moves from the first end 30a of the chuck 30 to its second end 30b, opposite the first end 30a.

[0117] Thus, the mandrel is inserted into the bore and, as it is driven further into the bore, the mandrel 30 allows the movable hooks 12 to be positioned on the fixed hooks 11, as illustrated in [Fig. 7b] and 7c. To this end, the inclined grooves 31 gradually press on the movable hooks 12 to rotate them and bend the thinned portion 16 of the movable hooks 12.

[0118] In an alternative embodiment illustrated in [Fig. 7d], the pole mounting tool 20 is equipped with slides 25, in particular each support portion 21 has two slides 25, one for each movable hook. The slides 25 are arranged on the support portion 21 at its base, under the corresponding protruding pole, so as to support the movable hooks 12. The slides 25 may initially protrude into the rotor bore and support the movable hooks in the longitudinal direction. Subsequently, the slides 25 gradually retract by radial translation as the mandrel 30 encounters them. At the end of the mandrel 30's movement, the slides 25 are completely pushed back by the mandrel 30 and no longer protrude into the rotor bore.

[0119] In a step (c), the rotor is then wound.

[0120] Alternatively, and if necessary, one or more of the salient poles 3a or 3b may have a lug 36 or a groove 37 in the area of ​​the central bore, in particular of substantially rectangular shape, as illustrated in [Fig. 8]. The lug 36 or the groove 37 allows a connection with the shaft 5 of the rotor.

[0121] The invention can be implemented on rotors with added polar flares. The invention is not limited to particular salient poles.

Claims

Demands

1. Wound rotor (1) of a rotating electrical machine, comprising: - a shaft (5) extending along a longitudinal axis (X), - a plurality of attached salient poles (3a, 3b), in particular an even number of salient poles, for example four salient poles, each salient pole (3a, 3b) comprising a pole body (4) having a free end (4a) intended to face a stator and a proximal end (4b) intended to cooperate with the shaft, at least one first salient pole (3a) comprising on either side of its proximal end (4b) fixed hooks (11), and at least one second salient pole (3b) comprising on either side of its proximal end (4b) movable hooks (12), each movable hook of a second salient pole being intended to cooperate with a fixed hook of a first salient pole.

2. Rotor according to the preceding claim, the plurality of reported salient poles (3a, 3b) comprising an alternation of first salient poles (3a) and second salient poles (3b).

3. Rotor according to any one of the preceding claims, each first protruding pole (3a) having notches (13) on either side of its proximal end (4b) above the fixed hooks (11), one notch in particular being substantially triangular in shape.

4. Rotor according to the preceding claim, a notch (13) being defined by two edges of the notch, a first edge (13a) of the notch extending substantially perpendicularly to a polar axis of the corresponding salient pole and a second edge (13b) of the notch extending obliquely with respect to the polar axis (Y), the first edge (13a) of the notch being in particular inclined at an angle of a few degrees with respect to the perpendicular to a polar axis of the corresponding salient pole, the inclination being in particular oriented towards the longitudinal axis X of the rotor, in particular with an angle between 5° and 10° with respect to the perpendicular to the polar axis (Y).

5. Rotor according to any one of the preceding claims, each second protruding pole (3b) having projections (14) on either side of its proximal end (4b) on either side movable hooks (12), one projection being in particular of substantially triangular shape.

6. Rotor according to any one of the preceding claims, each second protruding pole (3b) having cutouts (15) on either side of its proximal end (4b) on either side of the movable hooks (12), one cutout (15) being intended to receive a fixed hook (11).

7. Rotor according to any one of the preceding claims, the movable hooks (12) being connected by a thinned portion (16) to the pole body (4) of the corresponding second salient pole (3b).

8. Rotor according to any one of the preceding claims, a movable hook (12) having a back (12a) completing the bore of the rotor in a position of cooperation with a fixed hook (11) of a first salient pole (3a).

9. Rotor according to any one of the preceding claims, the movable hooks (12) being jammed by the shaft (5) in a position of cooperation with the fixed hooks (11) of the first salient pole(s).

10. Rotor according to any one of the preceding claims, the salient poles (3) being formed by an assembly of magnetic sheets, in particular of identical magnetic sheets.

11. Rotating electrical machine comprising a rotor (1) according to any one of the preceding claims.

12. Method of manufacturing a rotor (1) according to any one of claims 1 to 10, wherein the first and second salient poles (3a, 3b) are placed on an assembly tool (20) configured to allow the salient poles to converge towards the longitudinal axis (X) of the rotor.

13. Method according to the preceding claim, wherein the movable hooks (12) are then moved to cooperate with the corresponding fixed hooks (11), in particular by using a mandrel (30) introduced into the bore formed by the salient poles (3a, 3b).

14. A method according to the preceding claim, wherein the mandrel (30) has a plurality of grooves (31), in particular at least two, in particular four grooves (31), each forming a slope with respect to the longitudinal axis (X). 17

15. Method according to any one of claims 12 to 14, the pole mounting tool (20) being equipped with drawers (25), in particular each support part (21) may include a drawer (25).

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