FR3126563A1 - Method and assembly for assembling conductive pins for a rotating electrical machine - Google Patents

Abstract

The invention proposes a method of assembling (110) conductive pins in a transfer device, each conductive pin (18) being formed of at least one conductive segment (19) to form an electrical coil of a coiled part of a rotating electrical machine (10), the method comprising: a step of arranging (111) in an intermediate device (70) conductive pins; a step of loading (112) the conductive pins from the intermediate device (70) towards the transfer device (40), the loading step taking place by at least partial winding of the intermediate device around the transfer device and/or by rotation of the transfer device along the intermediate device and/or by a longitudinal displacement of the intermediate device relative to the transfer device. Figure for abstract: Fig. 6

Description

Method and assembly for assembling conductive pins for a rotating electrical machine

The invention relates in particular to a method for assembling conductive pins in a transfer device and to an assembly assembly of conductive pins making it possible to implement said method.

The invention finds a particularly advantageous application in the field of rotating electrical machines such as alternators, alternator-starters or even reversible machines or electric motors. It is recalled that a reversible machine is a rotating electrical machine capable of working in a reversible manner, on the one hand, as an electric generator in alternator function and, on the other hand, as an electric motor.

A rotating electrical machine comprises a mobile rotor rotating around an axis and a fixed stator. In alternator mode, when the rotor is rotating, it induces a magnetic field in the stator which transforms it into electric current in order to supply the electrical consumers of the vehicle and recharge the battery. In motor mode, the stator is electrically powered and induces a magnetic field driving the rotor in rotation, for example to start the heat engine of the vehicle such as a motor vehicle, or to provide it with torque assistance.

A coiled part of a rotating electrical machine is for example a stator comprising a body of the coiled part having a yoke forming a part of revolution around an axis passing through the center of the stator. The body has teeth extending radially from the yoke towards the center of the stator and around which is arranged an electrical winding. More particularly, the teeth delimit between them notches in which pass conductive elements participating in forming the winding of the stator. The winding is here formed of a plurality of conductive pins partially housed in the notches of the body and electrically connected two by two via their ends to form a continuous electrical path. Most conductive pins comprise two conductive segments substantially parallel to each other and connected by an angled junction so as to form an offset "U". The conductive segments are inserted respectively, at a first axial end face of the stator, in two separate notches so that the bent junctions protrude at the level of the first axial end face of the stator.

This offset "U" shape of the pins is conventionally obtained by a first bending step making it possible to obtain a flat "U" shape in which the two conductive segments extend in the same plane, then by a second twisting step. wherein the two conductive segments are offset in a circumferential direction relative to each other. This twisting step is conventionally done during a global twisting step in which all the conductive pins are twisted at the same time to obtain the offset of their respective conductive segments. This global twisting step only allows the pins to be positioned on a circle with a diameter corresponding to their final position in the body of the coiled part. A tool such as pliers then makes it possible to recover all the pins put in the twisting tool and to insert them into the body of the coiled part. The global twisting step facilitates the operation of transferring the pins from the twisting tools to the body of the coiled part because once twisted the pins are already placed in their final position, corresponding to the correct diameter of the stator, allowing their insertion directly in that body. However, this global twisting step does not allow precise twisting of the pins and can cause breaks in the enamel covering the copper forming the conductive pins, which can cause short circuits.

The twisting step can alternatively be done by a unitary twisting step in which each pin is twisted individually, which allows better control of the final dimensions of the pins and avoids breakage of the enamel. Due to their "U" shape and the offset between the conductive segments, it is not possible, during an automatic process, to position the pins directly in their final position for their insertion into the body of the coiled part. For example, a known method consists in placing the pins in a tool having a diameter much greater than the diameter of the body of the coiled part and then advancing the pins in a radial direction towards the axis of the tool until the pins are placed in their final position for insertion into the coiled part body. A gripper, such as those used after a global twisting process, can then be used to transfer the pins from this tool to the coiled part body.

This method of positioning the pins by radial displacement may not be applicable in certain winding configurations. Indeed, in some cases, the interweaving of the pins and/or the large number of conductive pin layers can complicate this method and lead to the use of different preparation steps. The assembly time of such a coil is then increased, which also leads to an increase in the cost of manufacturing a coiled part comprising a coil of the type with conductive pins.

The present invention aims to make it possible to avoid the drawbacks of the prior art. To this end, the subject of the present invention is a method for assembling conductive pins in a transfer device, each conductive pin being formed of at least one conductive segment and being intended to be electrically connected to at least one other pin conductor to form an electrical winding of a wound part of a rotating electrical machine. According to the invention, the transfer device comprises a pin body having a first axis and a plurality of guide lamellae extending radially from said body, lateral spaces intended to accommodate at least one conductive segment being defined between two lamellae adjacent guides. Still according to the invention, the method comprises a step of arranging conductive pins in an intermediate device, the intermediate device having a longitudinal body extending along a second axis in which is arranged a plurality of grooves, a groove being arranged to accommodate at least one conductive segment of a conductive pin; a step of loading the conductive pins from the intermediate device to the transfer device, the loading step taking place by at least partial winding of the intermediate device around the transfer device and/or by rotation of the transfer device along the intermediate device and/or by a longitudinal displacement of the intermediate device relative to the transfer device.

Thanks to the present invention and in particular to the use of the intermediate device, the assembly of the pins is simplified. Indeed, the intermediate device makes it possible to arrange the pins in a linear manner in a plane before rolling them up to form their nesting in an annular shape. Such an assembly method can be used regardless of the shape of the conductive pins, the number of layers formed by said pins or the nesting structure of said pins relative to each other. The method of assembling the conductive pins thus makes it possible to arrange the conductive pins, in particular twisted individually, in their final position relative to each other before their transfer into the body of the coiled part. Said assembly process is simplified and the risks of incorrect positioning of the pins are reduced. The overall cost of the assembly process is reduced.

According to one embodiment, during the loading step, the conductive pins are transferred from the intermediate device to the transfer device in a radial direction with respect to the axis of the transfer device. This direction of insertion makes it possible to optimize the simplification of said method.

According to one embodiment, during the loading step, an insertion device moves the conductive segments housed in the grooves of the intermediate device to help their insertion into the side spaces of the transfer device. This makes it possible to initiate the loading step in a simple manner.

According to one embodiment, the conductive segments are arranged in the grooves of the intermediate device so that at least a portion of each conductive segment is accessible to allow their displacement by the insertion device. For example, at least a portion of each conductive segment, arranged in the grooves of the intermediate device, protrudes from said groove so that, during the loading step, the insertion device moves the conductive segments to help their insertion into the side spaces of the transfer device. Thus, at least a portion of each conductive segment is not housed in a groove of the intermediate device.

According to one embodiment, during the loading step, at least a part of the intermediate device has a backward movement in a direction opposite to the direction of loading of the conductive segments from the grooves towards the lateral spaces. This simplifies the loading step.

According to one embodiment, the loading step further comprises a sub-step of positioning a radial holding support arranged to hold in a radial direction the conductive segments of the conductive pins in the lateral spaces of the pin body. This step of positioning the holding support during the loading step makes it possible to guarantee the holding of the conductive segments in the lateral spaces once they have been loaded into said spaces.

According to one embodiment, the guide strips are retractable so that they can be housed, respectively, in corresponding grooves made in the spindle body. Thus, each slat may have different radial positions and in particular a first holding position in which the slat extends circumferentially between two conductive segments to ensure their holding and a second rest position in which the slat extends at least partly in the spindle body so as to leave said conductive segments free. This solution for retracting the guide strips is a simple and space-saving solution for holding the conductive segments of the conductive pins after they have been loaded into the pin body while simplifying their loading by temporarily decreasing the radial depth of the side spaces. This makes it possible to improve the guidance of the conductive segments of the conductive pins towards the lateral spaces during the loading step.

Alternatively, the guide blades can be attached to the spindle body so that they can be detached from the spindle body. In another alternative, the guide slats can have an axial movement to release the corresponding lateral space.

According to one embodiment, during the arrangement step, the conductive pins can be arranged individually or collectively in the grooves of the intermediate device. By collective manner, it is meant that at least two conductive pins can be arranged in the same groove or in different grooves simultaneously.

According to one embodiment, all the conductive pins intended to form the electric winding are arranged in the intermediate device during the arrangement step. This makes it possible to simplify and shorten the assembly process by having the same step and the same tool to perform the winding. The so-called special conductive pins are then arranged and loaded in the pin body in the same way as the standard pins. By special pin, we mean pins having a different shape from standard pins, it may in particular be power pins and connection pins.

Alternatively, a portion of the conductive pins can be loaded into the transfer device during a second loading step without first being inserted into the intermediate device. For example, the special pins can be inserted, manually or automatically, into the transfer device after loading the standard pins via the intermediate device.

According to one embodiment, after the arrangement step, the conductive pins are housed in the grooves of the longitudinal body so as to form at least three groups of grooves, each group having a different arrangement, relative to each other, of conductive segments in the grooves, the first group having a number of conductive segments accommodated in each groove of said first group greater than the number of conductive segments accommodated in each groove of the second group and also greater than the number of conductive segments accommodated in each groove of the third group . The arrangement of the conductive segments in different groups makes it possible to simplify the loading step, in particular by allowing the simultaneous loading of several conductive pins during the same loading step.

According to one embodiment, the number of conductive segments accommodated in each groove of the first group is equal to the sum of the number of conductive segments accommodated in each groove of the second group with the number of conductive segments accommodated in each groove of the third group. This simplifies the layout step by avoiding having too many groups.

According to one embodiment, the second group and the third group are arranged on either side of the first group in the longitudinal axis direction of the body of the intermediate device. This makes it possible to carry out the loading step continuously without requiring replacement of the intermediate device.

According to one embodiment, each conductive segment housed in a groove defines a layer and in that the conductive segments housed in the grooves of the second group are arranged in different layers from the layers in which the conductive segments housed in the grooves of the third group are arranged so that the arrangement of the conductive segments of the second group is complementary to the arrangement of the conductive segments of the third group.

According to one embodiment, during the loading step, the conductive segments of the second group and the conductive segments of the third group will be arranged in the same lateral spaces. This allows each side space to have the same number of conductive segments.

According to one embodiment, the assembly method has, prior to the arrangement step, a shaping step in which the conductive pins are twisted to shift, in a circumferential direction, their respective conductive segments relative to each other. to the other. For example, this formatting step is done in a unitary manner. By unitary manner is meant that the conductive pins are shaped individually with respect to each other.

The present invention also relates to an assembly assembly of conductive pins in a transfer device, each conductive pin being formed of at least one conductive segment and being intended to be electrically connected to at least one other conductive pin to form an electrical winding of a coiled part of a rotating electrical machine. According to the invention, the assembly assembly comprises an intermediate device having a longitudinal body extending along a second axis in which is arranged a plurality of grooves, a groove being arranged to accommodate at least one conductive segment of a conductive pin; a transfer device comprising a pin body having a first axis and a plurality of guide strips extending radially from the body, lateral spaces intended to accommodate at least one conductive segment being defined between two adjacent guide strips, the transfer device being arranged to receive conductive pins during the implementation of the assembly method according to any one of the preceding claims.

According to one embodiment, the pin body has a cylindrical shape.

According to one embodiment, the assembly assembly further comprises an insertion device arranged to move conductive segments housed in the grooves of the intermediate device to help their insertion into the side spaces of the transfer device.

According to one embodiment, the longitudinal body of the intermediate device comprises at least one cavity in which the insertion device is at least partially housed. For example, at least a part of the insertion device is arranged between a bottom of the cavity and a portion of at least one conductive segment.

According to one embodiment, the grooves of the longitudinal body are separated into at least two distinct groove portions, said portions extending respectively on either side of the insertion device. This improves the stability of the conductive pins as the insertion device moves the conductive pins.

According to one embodiment, the insertion device has a ramp. The ramp shape of the insertion device allows for an insertion device that is effective in accompanying the loading movement of the conductive pins in the lateral spaces while remaining simple.

According to one embodiment, the ramp has a curved shape. This makes it possible to better adapt the shape of the ramp to the shape of the transfer device.

According to one embodiment, each groove extends in a transverse direction or in a direction inclined with respect to a direction transverse to the second axis of the intermediate device. The transverse direction of the groove simplifies the layout step. The inclined direction of the groove simplifies the loading step.

According to one embodiment, at least one groove of the second group and/or at least one groove of the third group: has a depth, in a direction transverse to the second axis, less than the depth of at least one groove of the first group; or comprises at least one conductive segment support arranged to reduce the depth of said groove such that said depth is less than the depth of at least one groove of the first group. This makes it possible to simplify the maintenance of the conductive pins in the intermediate device.

According to one embodiment, the assembly assembly further comprises a radial holding support arranged to hold the conductive pins after their respective loading step in the lateral spaces. For example, the radial retaining bracket is arranged to block radial movement, outward relative to the axis of the pin body, of the conductive segments.

According to one embodiment, the assembly further comprises a device for immobilizing at least one conductive supply or connection pin in the pin body, said conductive supply or connection pin having a height, in an axial direction, different from a height, in an axial direction, of a standard conductive pin. This immobilization device makes it possible to carry out the assembly process described above in one go even when the electrical winding to be inserted has different types of conductive pins. This makes it possible to simplify said method and to standardize it regardless of the type of conductive pins used.

The present invention may be better understood on reading the detailed description which follows, non-limiting examples of implementation of the invention and examination of the appended drawings.

There represents, schematically and partially, a sectional view of a rotating electrical machine according to an example of implementation of the invention.

There schematically represents a perspective view of the stator of the .

There schematically represents a perspective view of an example of a conductive pin of the stator of the .

There schematically represents a sectional view along a radial plane of part of the stator of the .

There schematically represents a perspective view of an example of a transfer device carrying conductive pins.

There schematically represents a perspective view of an example of a step for loading the transfer device via the intermediate device.

There schematically represents a perspective view of another example of a step for loading the transfer device via the intermediate device.

There schematically represents a detailed view of the loading stage of the figure.

There depicts a more accurate perspective view of the loading stage of the through assembly assembly.

There schematically represents an enlarged view of the wherein the intermediate device is removed.

There schematically and partially represents a view in axial section of a first example of an arrangement step.

There schematically and partially represents an axial sectional view of an alternative arrangement of the conductive pins in the grooves.

There schematically and partially represents a view in axial section of a second example of an arrangement step.

There shows a flowchart of an example assembly process.

Identical, similar or analogous elements retain the same references from one figure to another. It will also be noted that the various figures are not necessarily on the same scale.

There represents an example of a compact and polyphase rotary electrical machine 10, in particular for a vehicle such as a motor vehicle. This machine 10 transforms mechanical energy into electrical energy, in alternator mode, and can operate in motor mode to transform electrical energy into mechanical energy. This rotating electrical machine 10 is, for example, an alternator, an alternator-starter, a reversible machine or an electric motor.

In this example, the machine 10 comprises a box 11, in particular formed of a first flange 16 and a second flange 17, fixed to the vehicle by fastening means 14. Inside this box 11, it comprises, in addition, a shaft 13, a rotor 12 integral in rotation with the shaft 13 and a stator 15 surrounding the rotor 12. The rotational movement of the rotor 12 takes place around an axis X. In the following description, the axial direction corresponds to the axis X, crossing the shaft 13 at its center, while the radial orientations correspond to concurrent planes, and in particular perpendicular, to the axis X. For the radial directions, the internal denomination corresponding to an element oriented towards the axis, or closer to the axis with respect to a second element, the external denomination denoting a distance from the axis. A drive member 20 such as a pulley or a pinion can be fixed on a front end of the shaft 13. This member makes it possible to transmit the rotational movement to the shaft or to the shaft to transmit its movement of spin.

In the exemplary embodiment described in the remainder of the description, the coiled part corresponds to the stator 15 of the rotating electrical machine. However, we will not depart from the scope of the invention by using a rotor as the wound part.

In this exemplary embodiment, the stator 15 comprises a coiled part body 21 formed of a stack of laminations provided with notches 22, equipped with notch insulation 23 for mounting an electric winding 24. The winding passes through the notches of the body 21 and form a front bun 25a and a rear bun 25b on either side of the coiled piece body. Furthermore, the winding 24 is formed of one or more phases comprising at least one electrical conductor and being electrically connected to an electronic assembly 26. The electronic assembly 26 which is here mounted on the box 11, comprises at least one electronic module power for controlling at least one phase of the winding 24. The power module forms a voltage converter forming in particular a voltage rectifier bridge to transform the alternating voltage generated into a direct voltage and vice versa. Alternatively, the electronic assembly could be remote from the machine.

There shows the stator 15 in more detail. The coiled part body 21 is formed of a yoke 27 of annular shape around the axis X and of a plurality of teeth 28 extending radially in the direction of the center of the stator from of the cylinder head, and in particular here from a side face forming an internal wall of the cylinder head 27. The teeth 28 are regularly distributed angularly around the periphery of the cylinder head, with successive spaces provided between two adjacent teeth so as to define the notches 22. In the axial direction, the notches 22 are open on a first axial end face 29a and a second axial end face 29b of the coiled part body 21. In other words, the notches cross axially right through share the body and lead to the two opposite axial end faces of the stator. By the terms "axial end faces" is meant faces perpendicular or substantially perpendicular to the axis of revolution X of the stator.

The coil 24 is formed from a plurality of conductive pins 18, each having at least one conductive segment 19, electrically connected together to form electrical paths forming the phases of the coil. In the example of the , each phase comprises a plurality of conductive pins 18 including a plurality of first standard pins 31, a plurality of second standard pins 30, a connection pin 32 and two power pins 33, 34. Alternatively, each phase can be formed differently, thus it will not be departing from the scope of the invention by changing the composition of the type of conductive pin forming a phase, for example by removing the connection pin or by having a different number of standard pin types.

As illustrated on the , a standard conductive pin 30, 31 is formed of two conductive segments 31A, 31B extending axially in the notches 22 and which for this purpose are substantially parallel to each other. Said conductive segments are connected to each other via a bent junction 31C which is also conductive so as to form electrical continuity. The conductive segments 31A, 31B of the same pin 30, 31 are arranged in two separate notches from each other. The conductive segments are each connected to another conductive pin via their respective free ends 31F. These electrical connections between the conductive pins are for example made by welding. The free ends 31F and the bent junction 31C extend axially outside the notches so as to form the buns 25a, 25b. Power pins 33, 34 are each formed of a single conductive segment extending axially into notches 22. Connecting pin 32 may have a shape similar to standard pins or power pins. At least one power pin 33, 34 or at least one connection pin 32 may have a height, in an axial direction, different from a height of a standard pin 30, 31.

As seen on the , the various conductive segments 19 arranged in the same notch 22 are superimposed in order to form a stack of N layers Ci, it being understood that these N layers are present in each of the notches so that circles are formed around the periphery of the stator rings substantially coaxial with each other. In this embodiment, these layers are four in number and numbered from C1 to C4, according to their stacking order in the notches 22. The first layer C1 corresponds to the outer layer, the second layer C2 corresponds to a central layer outer layer directly adjacent to the first layer C1, the third layer C3 corresponds to the inner central layer directly adjacent to the second layer C2 and the fourth layer C4 corresponds to the inner layer. The first layer C1 is thus occupied by the conductive segment closest to the yoke 27 and the layer C4 is thus occupied by the conductive segment closest to the axis X. Of course, the invention is not limited to this single embodiment such that more or less number of conductor segments can be stacked in each slot eg 2, 6, 8 or 10 conductors. For example, a layer is formed by a single conductive segment. Thus, each notch 22 comprises N conductive segments aligned radially with respect to each other on a single line and each forming a layer Ci. In the example illustrated, the conductive segments each have a substantially rectangular section facilitating their stacking in the notch .

There will now be described with reference to FIGS. 5 to 14, a method for assembling 110, carried out by means of an assembly assembly, conductive pins 18 making it possible to load said pins into a transfer device 40. This device for transfer will subsequently allow direct insertion of the conductive pins into the notches 22 of the body of the coiled part 21 in order to form the coiled part of the rotating electrical machine.

There shows an example of a transfer device 40 in which the conductive pins 18 are arranged at the end of the assembly process 110 and before their transfer into the coiled part body 21. The transfer device 40 comprises a pin body 41 s' extending generally cylindrically about a Z axis and a plurality of guide strips 42 extending radially from the spindle body 41. Two adjacent guide strips define a lateral space 43 in which can be accommodated at least one segment conductor 19 of a conductive pin, and in particular several conductive segments. At the end of the assembly process 110, the conductive pins 18 are arranged in the pin body 41 so that the conductive segments 19 are housed at least partially in the lateral spaces 43. More precisely in this example, the segments conductors 19 are housed in the side spaces 43 so that each free end protrudes axially from the side space. In other words, each guide strip 42 has a height in an axial direction less than an axial height of the conductive segments 19.

During this assembly process 110, the conductive pins 18 have an intermediate shape, that is to say they have a shape which is not the final shape of the conductive pins to form the electrical winding 24. of the assembly process, each pin 18 has undergone a preliminary shaping step in which a bent junction 18C is formed, in particular by a first phase of bending then a second phase of twisting making it possible to shift the conductive segments 19 from one same conductive pin. The twisting phase is preferably a unitary twisting phase made individually for each conductive pin 18. During said process, the conductive segments 19 extend axially to their free end.

The assembly method 110 comprises a first arrangement step 111 in which the conductive pins 18 are arranged in an intermediate device 70. The arrangement step will be described in more detail below with reference to FIGS. 11 to 13. The intermediate device 70 comprises a longitudinal body 71 extending along an axis Y in which is arranged a plurality of grooves 72. Each groove defines a housing 73 receiving at least one conductive segment 19 of a conductive pin 18. Each housing 73 extends in a direction transverse to the Y axis. The intermediate device 70 has in particular the form of a loading rail. Each groove 72 can extend in a direction transverse or inclined with respect to the Y axis. The inclination of the groove 72 is in particular made in the direction of the rotational movement of the transfer device 40.

The assembly process 110 comprises a second loading step 112 in which the conductive pins 18, arranged in the intermediate device 70, are transferred to the transfer device 40. In the examples described below, the transfer device 40 and the intermediate device 70 are arranged, during the loading step 112, relative to each other so that the Y axis extends in a direction generally perpendicular to the Z axis. , the longitudinal body 71 is positioned so that at least one housing 73 extends opposite a lateral space 43 of the pin body 41. The loading step 112 will be described in more detail below with reference to Figures 6 to 10.

In the first example shown in the , the loading step 112 is done by a rotation movement, along the arrow F1, of the transfer device 40 on itself around the Z axis in combination with a translation movement, along the arrow F2, of the device intermediate 70 along the Y axis. In a variant embodiment not shown, a translational movement along the Y axis could be added to the rotational movement of the transfer device and the intermediate device could be immobile or also present a translational movement in a direction opposite to the translational movement of the transfer device.

The intermediate device 70 comprises a drive support 74 on which the longitudinal body 71 is mounted. The drive support 74 is arranged to move the longitudinal body 71. Said support can then have a shape corresponding to the direction of movement. of the longitudinal body 71. In this example, the drive support 74 extends axially and has a flat longitudinal shape. The drive support 74 can for example be a caterpillar.

In the second example shown in the , the loading step 112 is done by a winding movement, along the arrow F3, of the intermediate device 70 around the transfer device 40. This winding movement can be partial or take place over the entire circumference of the transfer device. transfer 40. In combination with this winding movement, the transfer device 40 can present a rotational movement on itself around the Z axis, in a direction opposite to the winding direction of the intermediate device 70. In In this example, the drive support 74 extends in a circular manner and in particular has an annular shape.

In the following description, the loading step 112 will be described in more detail with reference to the first example of the . It is understood that what is described below may also apply to the alternative embodiment presented on the .

During the loading step 112, the conductive pins 18 are transferred from the intermediate device 70 to the transfer device 40 in a generally radial direction with respect to the Z axis of the transfer device or in a generally transverse direction with respect to the Y axis of the intermediate device.

As shown in the example of the , the loading step 112 is carried out continuously housing after housing. By continuous means, the fact that the transfer of a dwelling can begin before the transfer of the previous adjacent dwelling is completed. In other words, all the pins contained in all the housings 73 of the intermediate device 70 are not transferred simultaneously into the side spaces 43 of the transfer device 40 but one after the other.

During the loading stage 112 visible on the , each guide lamella 42 can be arranged in a rest position until at least one conductive segment 19 is transferred into the lateral space 23 adjacent to said lamella. The guide blade 42 can then present a radial movement towards the outside, up to a holding position so as to accompany the transfer of said conductive segment 19 and maintain said segment in the corresponding lateral space 43. Thus, each blade of guide 42 can have different radial positions relative to the pin body 41. For example, each guide blade can have a holding position in which it is arranged so as to extend circumferentially between at least two conductive segments 19 and a position rest in which it is housed in a groove formed in the pin body 41 so as to leave free the circumferential space between said two conductive segments. In the rest position, the lamella can for example be fully inserted into the pin body so as to no longer project radially with respect to an outer surface of said body. In this example, each guide blade 42 can exhibit a radial movement from the rest position to the holding position during the loading step 112. The radial movement is in particular made continuously.

As illustrated in Figures 9 and 10, the intermediate device 70 may include an insertion device 75 making it possible, during the loading step 116, to help move the conductive segments 19 housed in the housings 73 to simplify their insertion. in the lateral spaces 43 of the transfer device 40. For example, the insertion device 75 has a surface forming a ramp 76. In this example, the ramp 76 has a curved shape making it possible to continuously accompany the movement of the conductive segments 19 to the side spaces 43. One end of the ramp 76 moves, in particular by a lifting movement, a portion of the conductive segment 19 to be transferred from the housing 73 to the associated side space 43, then said portion of said segment can slide the along part of the ramp in order to be completely housed in the lateral space 43. In this example, the insertion device 75 is fixed, that is to say it is immobile by relative to the longitudinal body 71. The sliding of the conductive segment is created by the movement of said body 71 relative to said device 75.

The longitudinal body 71 of the intermediate device may include a cavity 77 housing part of the ramp 76 so that the ramp 76 is arranged between a bottom of the cavity 77 and a portion of a conductive segment 19. For example, each groove 72 of the longitudinal body 71 is formed of a first groove portion and a second groove portion respectively forming a first housing portion and a second housing portion. The portions of the same housing are arranged in alignment with each other in a direction transverse to the Y axis so as to accommodate two distinct portions of the same conductor segment 19. The insertion device 75 extends between the first and the second groove portion so as to move a portion of the conductive segment extending between said two housing portions.

During the loading step 112, the intermediate device may also present a recoil movement in a direction opposite to the direction of loading of the conductive segments 19 from the housings 73 towards the lateral spaces 43. The recoil movement of a part of the longitudinal body 71 can be made simultaneously with the radial extension movement of a guide blade 42, in particular from the rest position to the holding position, arranged opposite said part of the longitudinal body 71 .

The transfer device 40 may comprise a radial holding support 45 visible in FIGS. 5 and 9. The radial holding support 45 is arranged to hold, in a radial direction, the conductive segments 19 of the conductive pins 18 in the lateral spaces 43 The holding support is positioned around the outer circumference of the pin body 41 provided with said pins 18. The radial holding support 45 is in particular positioned around the pin body 41 provided with conductive pins 18 during the loading step 112 The radial retaining support is in particular positioned after the transfer of a conductive segment 19 into the corresponding lateral space 43 . Preferably, the retaining support 45 may completely surround said body 41. The retaining support 45 may have several portions arranged adjacently to surround said body 41. This simplifies the positioning of said support.

The arrangement step 111 can be carried out manually, an operator manually positioning the conductive pins 18 one by one in the housings 73, or automatically.

During the arrangement step 111, the conductive pins 18 can be arranged individually or collectively in the housings 73 of the intermediate device. When the conductive pins are inserted collectively into the respective housings, this insertion can be done by grouping the pins arranged in different, in particular adjacent, housings. Thus, several housings 73, in particular adjacent ones, can be filled simultaneously. Said insertion can, alternatively or also, be done by grouping several conductive pins superimposed in the same housings. Thus, the same housing 73 can simultaneously receive all the corresponding pins.

A first example of an arrangement step 111 is illustrated in the . In this example, the conductive pins are arranged in a so-called nested configuration, i.e. a first standard pin 30 has a first conductive segment arranged in layer C1 and a second conductive segment arranged in layer C3 and a second standard pin 31 has a first conductive segment arranged in layer C2 and a second conductive segment arranged in layer C4 of the coiled part body 21. The layers C1, C2, C3 and C4 formed in the notches 22 of the part body coil 21 are also present in the side spaces 43 of the spindle body 41. The layers of the side spaces 43 are arranged oppositely with respect to the layers C1 to C4, i.e. the layer C4 is arranged in the bottom of the side space and the layer C1 is arranged at the level of the opening of the side space. Similarly, the layers C1, C2, C3 and C4 formed in the notches 22 are also present in the housings 73 of the longitudinal body 71. The layers C1', C2', C3', C4' of the housings 73 are arranged same way with respect to layers C1 to C4. Thus, the layer C4 'is arranged at the opening of the housing 73 and the layer C1' is arranged at the bottom of the housing 73. The conductive segments 19 of the same conductive pin are inserted into two different housings 73 and longitudinally shifted. The number of offset housings between the conductive segments of a pin is equal to the number of offset notches 22 between said segments when the coil 24 is formed in the body of the coiled part.

In the example of the , the arrangement step 111 is carried out by a first phase of inserting a first number of first standard pins 30 into the layers C1' and C3' then by a second phase of inserting a second number of second standard 31 pins in C2' and C4' layers. The second standard pins 31 are here arranged in the same housings 73 as said first pins 30. The arrangement step 111 then comprises a third phase of inserting a third number of first standard pins 30 into the layers C1' and C3'. The first conductive segments of the first standard hairpins 30 of the third phase are here arranged in the same housings 73 as the second hairpins 31 so as to form the layer C3' and the second conductive segments of the first standard hairpins 30 of the third phase are here arranged in empty housings 73 so as to form the layer C1'. Said step 111 comprises a fourth phase of insertion of a fourth number of second standard pins 31 in the layers C2' and C4' superimposed on the standard pins 30 inserted in the third phase. The same number of standard pin 30 and standard pin 31 is thus inserted at each phase. Step 111 may also include a fifth phase of positioning a power pin 33 in layer C1', a connection pin 32 in layers C2' and C3' and a power pin 34 in the C4' layer.

After the arrangement step 111 illustrated in the , the conductive segments 19 of the conductive pins are distributed so as to form three groups of grooves. The first group G1 has four conductive segments housed in each of its housings 73. The second group G2 has two conductive segments housed in each of its housings 73. The third group G3 has two conductive segments housed in each of its housings 73. For s 'simplify the , all the housings of the first group G1 are not represented but it will be understood that the first housing has a number of grooves much greater than the number of grooves of the second and third groups.

The second group G2 and the third group G3 are each arranged at an axial end of the first group G1 such that the first group is a central group and the second and third groups each form an edge of the set of conductive pins. In this example, the conductive segments of the first group G1 occupy the layers C1', C2', C3' and C4'; the conductive segments of the second group G2 occupy the layers C1', C2' and the conductive segments of the third group G3 occupy the layers C3', C4'. During the loading step 112, the conductive segments of the second group G2 and the conductive segments of the third group G3 will be superimposed radially with respect to the Z axis in the same lateral spaces 43 so that each lateral space comprises the same number of conductive segments.

There illustrates an exemplary embodiment in which each housing 73 of the third group G3 comprises a conductive segment support 78 making it possible to fill in the layers of the housing bottom that do not have a conductive segment.

A second example of an arrangement step 111 is illustrated in the . In this example, the conductive pins are arranged in a so-called side-by-side configuration, i.e. a first standard pin 30 has a first conductive segment arranged in layer C1 and a second conductive segment arranged in the layer C2 and a second standard hairpin 31 has a first conductive segment arranged in the layer C3 and a second conductive segment arranged in the layer C4 of the coiled part body 21. The arrangement step 111 of this second example can take place similar to the first example. More specifically, step 111 can comprise several phases, each allowing different numbers of conductive pins to be inserted.

After the arrangement step 111 illustrated in the , the conductive segments 19 of the conductive pins are distributed so as to form three groups of grooves similarly to the example of the . The second group G2 and the third group G3 are each divided into two subgroups G2', G2'', G3', G3''. The first sub-group G2' has a conductive segment housed in the layer C1' of each of its housings 73. The second sub-group G2'' has three conductive segments housed in the layers C1', C2' and C3' of each of its housings 73. The third subgroup G3'' has three conductive segments housed in the layers C4', C2' and C3' of each of its housings 73. The fourth subgroup G3' has a conductive segment housed in the layer C4' of each of its housings 73. During the loading step 112, the conductive segments of the first sub-group G2' and the conductive segments of the third sub-group G3'' will be superimposed radially with respect to the axis Z in the same lateral spaces 43 and the conductive segments of the second subgroup G2'' and the conductive segments of the fourth subgroup G3' will be superimposed radially with respect to the Z axis in the same lateral spaces 43.

The arrangement of the conductive pins of the allows the loading step to be carried out in one go or in several phases. For example, the loading step 112 can have a first phase of loading the layers C3' and C4' then a second phase of loading the layers C1' and C2'.

All the conductive pins 18 intended to form the electrical winding 24 can be arranged in the intermediate device 70 during the arrangement step 111. The standard pins 30, 31, the power pins 33, 34 and the connection pins 32 are then arranged in the intermediate device 70 during said arrangement step 111. The loading step 116 is then done for all the conductive pins 18. Alternatively, the standard pins 30, 31 can be loaded by means of a automatic method using in particular the steps of arrangement 111 and loading 112 described above and the connection pins 32 and/or power supply 33, 34 can be loaded, automatically or manually, directly into the transfer device 40 after the loading step 112.

The transfer device 40 may include an immobilization device 47, visible on the , making it possible to maintain at least one supply pin 33, 34 and/or at least one connection pin 32 in the pin body 41. The immobilizing device 47 in particular makes it possible to maintain said pins in the radial and axial directions. In this exemplary embodiment, the immobilizer 47 is formed of a groove in which is inserted a power pin 33, 34. The connection pin 32 is, here, maintained in the same way as the standard pins 30, 31 via the guide strips 42. Alternatively, the immobilization device 47 can be formed by low walls surrounding the pin to be maintained or a snap-fastening system.

The present invention finds applications in particular in the field of alternators, alternator-starters, electric motors or even reversible machines, but it could also be applied to any type of rotating machine. Of course, the foregoing description has been given by way of example only and does not limit the scope of the present invention, which would not be departed from by replacing the various elements with any other equivalents. For example, we will not depart from the scope of the invention by adapting the method and the assembly assembly described above for a rotating electrical machine whose stator is positioned radially inside the rotor.

Claims (15)

Method for assembling conductive pins in a transfer device, each conductive pin (18) being formed of at least one conductive segment (19) and being intended to be electrically connected to at least one other conductive pin to form a winding of a coiled part of a rotating electrical machine (10), the transfer device (40) comprising a spindle body (41) having a first axis (Z) and a plurality of guide blades (42) extending radially from said body, lateral spaces (43) intended to accommodate at least one conductive segment (19) being defined between two adjacent guide blades (42), the method (110) being characterized in that it comprises:

• a step of arranging (111) in an intermediate device (70) conductive pins (18), the intermediate device having a longitudinal body (71) extending along a second axis (Y) in which is arranged a a plurality of grooves (72), one groove being arranged to accommodate at least one conductive segment (19) of a conductive pin;
• a step of loading (112) the conductive pins (18) from the intermediate device (70) to the transfer device (40), the loading step taking place by winding at least part of the intermediate device (70) around the transfer device transfer (40) and/or by rotation of the transfer device (40) along the intermediate device (70) and/or by longitudinal displacement of the intermediate device (70) relative to the transfer device (40).

Assembly method according to the preceding claim, characterized in that, during the loading step (112), the conductive pins (18) are transferred from the intermediate device (70) to the transfer device (40) in one direction radial with respect to the axis (Z) of the transfer device. Assembly method according to one of the preceding claims, characterized in that, during the loading step (112), an insertion device (75) moves the conductive segments (19) housed in the grooves (72) of the intermediate device (70) to help their insertion into the side spaces (43) of the transfer device (40). Assembly method according to one of the preceding claims, characterized in that, during the loading step (112), at least part of the intermediate device (70) exhibits a backward movement in a direction opposite to the direction loading the conductive segments (19) from the grooves (72) to the side spaces (43). Assembly method according to one of the preceding claims, characterized in that after the arranging step (111), the conductive pins (18) are housed in the grooves (72) of the longitudinal body (71) of so as to form at least three groups (G1, G2, G3, G2', G2'', G3', G3'') of grooves, each group having a different arrangement, relative to each other, of the conductive segments (19 ) in the grooves (72), the first group (G1) having a number of conductive segments housed in each groove of said first group greater than the number of conductive segments housed in each groove of the second group (G2, G2', G2'') and also greater than the number of conductive segments accommodated in each groove of the third group (G3, G3', G3''). Assembly method according to the preceding claim, characterized in that the number of conductive segments (19) housed in each groove (72) of the first group (G1) is equal to the sum of the number of conductive segments (19) housed in each groove (72) of the second group (G2, G2', G2'') with the number of conductive segments (19) housed in each groove (72) of the third group (G3, G3', G3''). Assembly method according to one of Claims 4 or 5, characterized in that the second group (G2, G2', G2'') and the third group (G3, G3', G3'') are arranged on either side other of the first group (G1) in the longitudinal axis direction (Y) of the body of the intermediate device (70). Assembly method according to one of Claims 4 to 6, characterized in that each conductive segment (19) housed in a groove (72) defines a layer (C1', C2', C3', C4') and in that that the conductive segments housed in the grooves of the second group (G2, G2', G2'') are arranged in different layers from the layers in which the conductive segments housed in the grooves of the third group (G3, G3', G3) are arranged '') so that the arrangement of the conductive segments of the second group is complementary to the arrangement of the conductive segments of the third group. Assembly assembly of conductive pins in a transfer device, each conductive pin (18) being formed of at least one conductive segment (19) and being intended to be electrically connected to at least one other conductive pin to form a winding of a coiled part of a rotating electrical machine (10), the assembly assembly being characterized in that it comprises:

• an intermediate device (70) having a longitudinal body (71) extending along a second axis (Y) in which a plurality of grooves (72) are arranged, one groove being arranged to accommodate at least one conductive segment ( 19) a conductive pin;
• a transfer device (40) comprising a spindle body (41) having a first axis (Z) and a plurality of guide strips (42) extending radially from the body, lateral spaces (43) intended to accommodate at least one conductive segment (19) being defined between two adjacent guide strips, the transfer device (40) being arranged to receive conductive pins (18) during the implementation of the assembly method (110) according to any of the preceding claims.

Assembly assembly according to the preceding claim, characterized in that it further comprises an insertion device (75) arranged to move conductive segments (19) housed in the grooves (72) of the intermediate device (70) to aid their insertion into the side spaces (43) of the transfer device (40). Assembly assembly according to the preceding claim, characterized in that the insertion device (75) has a ramp (76). Assembly assembly according to Claim 10 or 11, characterized in that the grooves (72) of the longitudinal body (71) are separated into at least two distinct groove portions, the said portions extending respectively on either side of the insertion device. Assembly assembly according to one of Claims 9 to 12, characterized in that each groove (72) extends in a transverse direction or in a direction inclined with respect to a direction transverse to the second axis (Y) of the intermediate device (70). Assembly assembly according to one of Claims 9 to 13 when dependent on any one of Claims 5 to 8, characterized in that at least one groove (72) of the second group (G2, G2', G2'' ) and/or at least one groove (72) of the third group (G3, G3', G3''):

• has a depth, in a direction transverse to the second axis (Y), less than the depth of at least one groove (72) of the first group (G1); Or
• comprises at least one conductive segment support (78) arranged to reduce the depth of said groove so that said depth is less than the depth of at least one groove (72) of the first group (G1).

Assembly assembly according to one of Claims 9 to 14, characterized in that it further comprises a radial holding support (45) arranged to hold the conductive pins (18) after their respective loading step in the side spaces (43).