FR3108809A1 - Stator connection device - Google Patents

Abstract

Stator connection device Connector (1) for an external stator, comprising: an insulating support (10), a set of four electrical conductors (20, 30, 40, 50) having connection lugs to the stator winding conductors and to a stator supply bus, carried by the insulating support, this set of conductors having at least one neutral conductor (20) oriented parallel to the axis of the stator and at least one conductor (30; 50) oriented perpendicular to the stator axis. Figure for abstract: Fig. 1

Description

Connection device for stator

The present invention relates to synchronous or asynchronous alternating current machines, and in particular traction or propulsion machines for electric ( Battery Electric Vehicle ) and/or hybrid ( Hybrid Electric Vehicle – Plug-in Hybrid Electric Vehicle ) motor vehicles, such as whether individual cars, vans, trucks or buses. The invention also applies to rotating electrical machines for industrial applications and/or energy production, in particular naval or wind turbines.

The invention relates more particularly to the connection devices used to connect the windings of a stator to a supply bus thereof.

It is known to use connectors to facilitate the connection of the windings of an electric machine stator to a power supply bus.

Application US 2011/0175471 describes a connector for a tooth-wound three-phase stator of a machine with an external rotor. The connector is thus designed to be fixed radially inside the stator, and comprises three conductors each formed by cutting and bending a sheet of conductive material, each provided with a terminal for connection to a power supply bus of the stator and four connecting lugs to the conductors of the stator winding. The connector also comprises an insulating support molded over these conductors. The connection lugs to the winding conductors are oriented substantially in the circumferential direction, while the connection terminals are constituted by axially oriented lugs. One of the conductors extends in a circular manner for approximately 270° with its section oriented parallel to the axis of the machine, while the other two extend below it with their section oriented perpendicular to the axis of the machine. the machine.

Such a connector is suitable for a machine with an external rotor, in a delta configuration without a neutral conductor.

However, a large number of electric motors have an internal rotor, and can have a star configuration requiring a neutral conductor.

There is a need to benefit from a connection device which is reliable and which meets the requirements of large-scale industrial production, such as in the automobile, by being in particular easy to manufacture and to use.

There is also an interest in having a connection device which makes it possible to simplify the connection to a supply bus of the stator.

There also remains a need for a connection device making it possible to simplify the production of the windings of the stator and to gain in compactness for the machine.

The invention aims to meet all or part of these needs and relates to a connector for a stator, in particular an exterior one, comprising:

• An insulating support,
• A set of electrical conductors having connection tabs to the stator winding conductors and to a supply bus of the stator, carried by the insulating support, this set of conductors having at least one conductor having a conductive portion, extending between connection tabs, of flattened cross-section with a large side oriented parallel to the axis of the stator and at least one conductor having a conductive portion, extending between the connection tabs, having a flattened cross-section with a long side oriented perpendicular to the axis of the stator.

According to a first aspect of the invention, the set of conductors includes a neutral conductor. Thus, the connector is suitable for a star configuration of the windings.

According to a second aspect of the invention, independent of the presence or not of a neutral conductor, this second aspect of the invention being able to be combined with the first, the aforementioned conductive portions of long side of section oriented parallel to the axis of the stator comprise at least one rectilinear portion oriented non-radially, radially inner with respect to at least one connection lug of another conductor. This makes it possible to circumvent at least one connecting lug of another conductor at a short distance while avoiding a complex bending operation, and to preserve an opening of relatively large diameter in the center of the connector, to allow the passage of the rotor of the machine. .

According to a third aspect of the invention, which may or may not be combined with the first two, at least one of the conductors whose cross section is oriented parallel to the axis of the stator, and preferably the neutral conductor, comprises at least three branches, two of which extend at different levels along the axis of the stator, namely a first branch terminated by a connection tab preferably to a winding, a second branch terminated by a connection tab preferably to a winding, and a third branch being connected to the junction of the two others in a direction parallel to the axis of the stator, and passing under the second branch and ending in a connection lug preferably in a winding. The first and second branches can extend over the same level. The third branch can extend over a lower level than the second branch to pass underneath, then go up and end with the aforementioned connection tab, preferably located at the same level as the other two. Such a form of conductor is compatible with forming by cutting and bending, without a complex bending operation. The first and second branches can form a rectilinear portion, perpendicular to which the third branch is connected. The latter may also comprise a rectilinear portion, oriented substantially at 90° to the rectilinear portion formed by the first and second branches.

According to a fourth aspect of the invention, which may or may not be combined with the first three, the connector comprises at least one conductor whose section is oriented parallel to the axis of the stator, which extends in at least one location at the same level on the axis of the stator than at least one other conductor whose section is oriented perpendicular to the axis of the stator. This keeps the connector relatively compact in the axial direction.

In general, in all these aspects of the invention, the connection device according to the invention makes it possible to easily connect the winding conductors to one another and/or to the terminals of the power supply bus, the number of these terminals being typically equal to the number of phases. The orientation of the stator conductors makes it more compact.

It becomes possible, if desired, to house the connector inside the coil ends of the stator and therefore to gain in compactness in the axial direction.

In addition, the connector can be made, if desired, with an opening sufficient to allow the passage of the axis of the rotor. This can in particular be advantageous for facilitating the positioning of the rotor on the stator, by introducing the rotor through the stator fitted with its connector, via the side of the stator carrying the connector.

If the invention is particularly suitable for a star connection of the phases of the stator, certain aspects of the invention can also be applied to a delta configuration.

Preferably, the support is formed from a single piece of plastic material. As a variant, the support comprises several assembled parts. The support is preferably made by injection molding of thermoplastic material, but as a variant can be made otherwise, for example by machining or by an additive manufacturing technique.

Another subject of the invention is a stator for an electric machine, in particular for a machine with an external stator, comprising a winding whose conductors are connected to a connector according to the invention, as defined above.

The winding can have I or U pins. The stator can be wave-wound or otherwise.

Another subject of the invention is a method for manufacturing a stator according to the invention, in which the conductors of the coils are all placed in front of the connection tabs of the connector before being welded thereto.

FIG. 1 schematically represents an example of a connector produced in accordance with the invention,

Figure 2 shows the connector of Figure 1 from another angle of view,

figure 3 shows the connector of figure 1 from below,

Figure 4 is a view similar to Figure 3 from another angle,

figure 5 represents the conductors of the connector of figure 1 in isolation,

Figure 6 represents the conductors of the connector of Figure 2 in isolation,

figure 7 represents in isolation the insulating support of the connector of figure 1,

figure 8 represents in isolation the insulating support of the connector of figure 2,

figure 9 represents the neutral conductor of the connector in isolation,

Figure 10 is a front view along the arrow X of Figure 9,

Figure 11 is a side view along the arrow XI of Figure 9,

figure 12 represents the phase conductor W in isolation,

FIG. 13 represents the phase conductor U in isolation,

FIG. 14 represents the phase conductor V in isolation,

FIG. 15 partially and schematically represents an example of a stator equipped with the connector of FIG. 1,

figure 16 shows the stator of figure 15 from another angle of view,

FIG. 17 represents an embodiment detail of the connector,

Figure 18 illustrates the connection of a stator winding stranded conductor to the connector, and

FIG. 19 is a view similar to FIG. 18, in the case of a single-strand stator winding conductor.

detailed description

The connector 1 according to the invention, shown in Figures 1 to 4, comprises an insulating support 10 and four metal conductors 20, 30, 40 and 50, respectively neutral and phases W, V and U, carried by this support 10 .

The support 10 is produced in the example considered by molding of thermoplastic material, in a monolithic manner, but the invention is not limited to a particular technique for manufacturing the support and the latter can also be produced by an additive manufacturing technique. or by machining, of a plastic material or any other electrically insulating material.

The stator for which connector 1 is intended is preferably three-phase and external, but the invention is not limited to a particular number of phases.

Each conductor 20 to 40 of connector 1 is formed by cutting and bending a sheet of an electrically conductive metal, preferably copper.

The neutral conductor 20 is shown more particularly in Figures 9 to 11.

It has three lugs 21, 22 and 23 for connection to the conductors of the stator winding.

Legs 21 and 22 are connected by a flat rectilinear portion 24, oriented parallel to the axis of the stator, i.e. vertically in FIG. 9. Legs 21 and 22 are angled forwards in FIG. 9 relative to portion 24 .

The leg 23 is carried by a portion 25 which passes under the leg 22 and is connected to the portion 24 by a 90° elbow 25a directed upwards, this elbow 25a extending in the plane of the portion 24.

Portion 25 has an elbow 25b at 90° towards the rear, which connects a flat part 25c situated in the plane of elbow 25a and a rectilinear flat part 25d extending towards the rear, substantially perpendicular to portion 24. portion 25d is connected to the leg 23 via a first elbow 25e at 90° upwards and a second elbow 25f at 90° towards the right in figure 9.

Elbow 25e extends in the same plane as flat part 25d while elbow 25f is curved around an axis parallel to the axis of the stator, just like elbow 25b.

Leg 23 extends substantially parallel to portion 24.

The portion 24 has, on its lower edge, an extension 28, and the tab 23 an extension 29.

The tabs 21, 22 and 23 extend at the same level, and are all oriented substantially radially outward, as seen in Figure 1 in particular.

The neutral conductor 20 thus comprises three branches, two of which extend at different levels along the axis of the stator, namely the first branch terminated by the connection lug 21, the second branch terminated by the connection lug 22 and the third branch being connected to the junction of the other two in a direction parallel to the axis of the stator, passing under the second branch and ending with the connection lug 23. The first and second branches extend over the same level. The third branch extends over a portion of its path on a lower level than the second branch. The first and second branches form the rectilinear portion 24, perpendicular to the connection of the third branch.

The W-phase connector 30 is shown more particularly in FIG. 12.

It comprises a lug for connection to the stator winding conductors, a lug 32 for supporting a temperature sensor, and a lug 33 for connection to phase W of the stator power supply bus.

Legs 31 and 33 are connected by a flat curvilinear portion 34, the flat of which is oriented horizontally in FIG. 12, i.e. perpendicular to the axis of the stator. The lug 33 is oriented parallel to the flat of the portion 34, and is connected to the latter by an inflected portion 35.

Leg 31 is oriented substantially radially outwards, and is connected to portion 34 by a first elbow 34a curved around a horizontal axis and by a second elbow 34b extending in the plane of leg 31.

The leg 32 is connected by an elbow 34c to the radially outer edge of the portion 34. The leg 32 is oriented upwards.

Portion 34 is crossed by two holes 34f and 34g which are used to position conductor 30 in the mold used to mold insulating support 10. Hole 34g is bordered by a circular expansion 34j so as not to reduce the section of metal offered to the passage of current.

The rectilinear portion 24 is radially internal with respect to the connection lug 31, as can be seen in Figure 5 in particular.

The phase U connector 40 is shown in isolation in Figure 13.

It comprises a lug 41 for connection to a stator winding conductor, a lug 42 for supporting a temperature sensor, and a lug 43 for connection to phase U of the stator power supply bus.

Legs 41 and 43 are connected by a portion 44 which is generally oriented parallel to the axis of the stator, i.e. vertically in figure 13.

Leg 43 is oriented horizontally and is connected to one end of this portion 44 by an elbow 44a at 90° to the rear in figure 13.

Portion 44 has a flat rectilinear part 44b which extends towards elbow 44a by a part 44c forming a slight forward angle with part 44b.

The leg 41 connects to the part 44b by a first bend 44d to the left in FIG. 13, followed by a second bend 44e downwards. The first elbow 44d is curved around a vertical axis, while the second elbow 44e extends vertically, in the same plane as the part 44b. Tab 41 is oriented substantially radially on connector 1.

Leg 42 extends upward from the top edge of leg 41.

We will now describe with reference to Figure 14 the conductor 50 of phase V.

This conductor 50 includes a lug 51 for connection to a stator winding conductor and a lug 53 for connection to phase V of the stator power supply bus.

Legs 51 and 53 are connected by a curved portion 52 which extends mainly horizontally in FIG. 14, i.e. perpendicular to the axis of the stator.

The leg 53 is connected to the portion 52 by a bent part 54 and the leg 51 by a first elbow 54a at 90° upwards, followed by a second elbow 54b at 90° towards the rear, the first elbow 54a being curved around a horizontal axis and the second bend 54b extending in the plane of the leg 51. The latter is oriented substantially radially within the connector 1.

The conductor 50 has a hole 54d serving for its positioning within the mold, which is bordered by a circular expansion 54f.

It can be seen in Figures 5 and 6 that the various conductors of the connector thus have parts of flattened cross-section, oriented for some vertically and for others horizontally.

The conductors 40 and 50 partially overlap, a vertically oriented part of the connector 40 crossing a horizontally oriented part of the connector 50. The same applies to the connectors 20, 30 and 50, the vertically oriented parts of the connector 20 extending beyond above connector 50 or connector 30.

The rectilinear part 44b is radially inside the tab 53, as can be seen in Figure 5 in particular. It is the same for the rectilinear part 25d, which is radially inside the leg 51.

The tabs 33, 43 and 53 for connection to the power bus extend side by side at the same level. They can each have a circular outline as shown, and be crossed by an opening in which a nut 60 is crimped.

The insulating support 10 generally follows the shape of the conductors 20, 30, 40 and 50, being molded over them.

It has holes 61 in places, as seen in Figure 4 in particular, corresponding to the passage of pins for holding the conductors in position in the mold during the injection of the plastic material.

The conductors may have, as visible in FIG. 4 in particular, portions 62 not covered with plastic material, linked to the positioning of the corresponding surfaces of the conductors against the mold.

The support 10 may have on its upper face, as shown in FIG. 7 in particular, positioning studs 80 which are used when mounting the connector on the stator, so as to allow precise positioning of the connector relative to the stator.

In particular, these pads 80 can be arranged opposite the connection tabs to the power supply bus, and serve with a support surface 81 of the support 10, present in the vicinity of the tab 43 and located at the same level as the upper end of the pads 80, to form a positioning triangle allowing the connector 1 to be correctly oriented perpendicularly to the axis of the stator.

There is shown in Figures 15 and 16 the connector 1 in place on an outer stator 100.

The winding conductors are soldered to the lugs provided for this purpose on the phase and neutral conductors.

We see in Figures 15 and 16 that due to its compactness the connector 1 can be housed inside the coil heads, the lugs 21, 22, 23, 31, 41 and 51 being oriented radially outwards.

Despite this positioning inside the coil heads, connector 1 nevertheless leaves a sufficient opening for the passage of the rotor shaft, which is inside the stator.

The lugs used for mounting the winding conductors may have an opening 70, as illustrated in FIG. 17, in which is crimped a pin 72 of solder.

The stator winding conductors E can be multi-stranded, as shown in figure 18, or single-stranded as shown in figure 19.

The conductors E have their ends oriented generally parallel to the axis of the stator.

The connection lugs of the connector 1 on which the ends E are welded are oriented generally radially and parallel to the axis of the stator, which facilitates the welding operation, which can be carried out for example by means of a laser.

In the case of a stranded conductor, the strands can each be of rectangular section and welded side by side with their long side oriented perpendicular to the plane of the tab, as shown in figure 18.

In the case of a single-strand conductor, this can be of rectangular section and welded by its long side against the plane of the tab, as illustrated in figure 19.

The arrangement of the legs facilitates access to the welding tool, and can make it possible to weld several strands more easily.

The stator winding may be "wavy" or otherwise. The term "wavy winding" denotes a winding in which the electrical conductors of the same phase are electrically connected to each other so that the electric current of the phase circulates in the electrical conductors by rotating around the axis of rotation of the machine always in one direction.

The magnetic circuit of the stator preferably comprises closed slots.

To manufacture the stator, one can start by making the winding of the magnetic circuit by inserting the pins into the notches of the stator mass. Each pin can be U - shaped or straight, being I - shaped.

The pins do not require having open notches, we can have closed notches which allow to hold the pins and we can thus avoid a step of inserting wedges to close the notches of the stator.

The electrical conductors can be introduced into the corresponding slots by one or both axial ends of the machine.

An I-shaped electrical conductor has two axial ends each placed at one of the axial ends of the stator. It passes through a single notch, and can be welded at each of its axial ends to two other electrical conductors, at the axial ends of the stator.

A U-shaped electrical conductor has two axial ends both placed at one of the axial ends of the stator. It passes through two different notches, and can be welded at each of its axial ends to two other electrical conductors, at the level of the same side of the stator. The bottom of the U is placed on the other side of the stator.

Each electrical conductor may comprise, as mentioned above, one or more strands (“ wire ” or “ strand ” in English). By "strand" is meant the most elementary unit for electrical conduction. A strand can be of round cross section, we can then speak of 'thread', or flat. The flat strands can be shaped like a hairpin, for example U or I.

The fact that each notch can comprise several conductors and/or several strands makes it possible to minimize the losses by induced currents, or AC Joule losses, which evolve with the square of the supply frequency, which is particularly advantageous when the operating speed is high.

The electrical conductors are preferably arranged in a row in the notches. By “tidy manner”, it is meant that the electrical conductors are not arranged in the notches in bulk but in an orderly manner. They are stacked in the notches in a non-random manner, being for example arranged in one or more rows of electrical conductors aligned, in particular in the radial and/or circumferential direction.

The electrical conductors may be in cross section of generally rectangular shape, in particular with rounded edges. The circumferential dimension of an electrical conductor may correspond substantially to the width of a slot in the stator. Thus, a notch may only have a single electrical conductor across its width. The width of the notch is measured in its circumferential dimension around the axis of rotation of the machine.

The electrical conductors can be adjacent to each other by their long sides, the long side also being called "flat".

The optimization of the stack can make it possible to place a greater quantity of electrical conductors in the slots and therefore to obtain a stator of greater power, at constant volume.

In one embodiment, each electrical conductor comprises one or more pins, each forming a strand, as explained above. In this case, all the strands of the same electrical conductor can be electrically connected to each other at the exit from the notch. The strands electrically connected to each other are placed in short circuit. The number of strands electrically connected together can be greater than or equal to 2, being for example between 2 and 12, being for example 3, 4, 6 or 8 strands.

Several strands can form the same electrical conductor. The same electric current of the same phase circulates in all the strands of the same electrical conductor. All the strands of the same electrical conductor can be electrically connected to each other, in particular at the exit from the notch. All the strands of the same electrical conductor can be electrically connected to each other at each of their two axial ends, in particular at the exit from the notch. They can be electrically connected in parallel.

All the strands of all the electrical conductors having a free end located at the same circumferential position around the axis of rotation of the machine, whatever their radial position, can be electrically connected to each other.

In one embodiment, each electrical conductor has a single strand. In another embodiment, each electrical conductor has three strands.

In the case where a notch comprises two electrical conductors, a notch can accommodate two strands, or as a variant six strands, for example distributed between the two electrical conductors.

Alternatively, a slot has four electrical conductors. Each electrical conductor may comprise two strands. The notch then houses eight strands, distributed between the four electrical conductors.

The strands can be positioned in the notch so that their circumferential dimension around the axis of rotation of the machine is greater than their radial dimension. Such a configuration allows a reduction in losses by eddy currents in the strands.

A strand can have a width of between 1 and 5 mmm, being for example of the order of 2.5 or 3 mm. The width of a strand is defined as its dimension in the circumferential direction around the axis of rotation of the machine.

Of course, the invention is not limited to the examples which have just been described.

For example, the shape of the conductors of the connector 1 and that of the support 10 can be modified according to the way in which the outputs of the conductors of the windings are arranged.

The connector can be made with a single temperature sensor mounting lug, or even none.

Claims (18)

Connector (1) for stator, comprising:

1. an insulating support (10),
2. a set of electrical conductors (20, 30, 40, 50), including a neutral conductor (20), having connection lugs to the stator winding conductors and to a stator power supply bus, carried by the insulating support, this set of conductors having at least one conductor (20) having a conductive portion, extending between connection tabs, having a flattened cross-section with a long side oriented parallel to the axis of the stator and at least one conductor (30; 50) having a conductive portion, extending between connection tabs, having a flattened cross-section with a large side oriented perpendicular to the axis of the stator.

Connector (1) for stator, comprising:

1. an insulating support (10),
2. a set of electrical conductors (20, 30, 40, 50), preferably including a neutral conductor (20), having connection lugs to the stator winding conductors and to a stator power supply bus, carried by the support insulation, this set of conductors having at least one conductor (20) having a conductive portion, extending between connection tabs, having a flattened cross-section with a long side oriented parallel to the axis of the stator and at least one conductor ( 30; 50) having a conductive portion, extending between connection lugs, having a flattened cross-section with a large side oriented perpendicular to the axis of the stator, the conductive portions with a large side oriented parallel to the axis of the stator comprising at least one rectilinear portion (24) oriented non-radially, radially interior with respect to at least one lug (31) for connecting another conductor (30).

Connector (1) for stator, comprising:

1. an insulating support (10),
2. a set of electrical conductors (20, 30, 40, 50), preferably including a neutral conductor (20), having connection lugs to the stator winding conductors and to a stator power supply bus, carried by the support insulation, this set of conductors having at least one conductor (20) having a conductive portion, extending between connection tabs, having a flattened cross-section with a long side oriented parallel to the axis of the stator and at least one conductor ( 30; 50) having a conductive portion, extending between connection lugs, having a flattened cross-section with a large side oriented perpendicular to the axis of the stator, at least one (20) of the conductors whose cross-section is oriented parallel to the axis of the stator, and preferably the neutral conductor, comprising at least three branches, two of which extend at different levels along the axis of the stator, namely a first branch terminated by a lug (21) connection to a winding, a second branch terminated by a lug (22) for connection to a winding, and a third branch being connected to the junction of the two others in a direction parallel to the axis of the stator, passing under the second branch , and ending in a lug (23) for connection to a winding, the first and second branches preferably extending over the same level, the third branch preferably extending over a level lower than the second branch to pass underneath , then go up and end with the connection leg (23), the latter preferably being located at the same level as the other two, the first and second branches preferably forming a rectilinear portion (24), perpendicular to which is connected the third branch.

Connector (1) for stator, comprising:

1. an insulating support (10),
2. a set of electrical conductors (20, 30, 40, 50), preferably including a neutral conductor (20), having connection lugs to the stator winding conductors and to a stator power supply bus, carried by the support insulation, this set of conductors having at least one conductor (20) having a conductive portion, extending between connection tabs, having a flattened cross-section with a long side oriented parallel to the axis of the stator and at least one conductor ( 30; 50) having a conductive portion, extending between connection lugs, having a flattened cross-section with a large side oriented perpendicular to the axis of the stator, the connector comprising at least one conductor (20) whose cross-section is oriented parallel to the axis of the stator, which extends in at least one location at the same level on the axis of the stator as at least one other conductor (30) whose section is oriented perpendicular to the axis of the stator.

Connector according to any one of the preceding claims, comprising at least one conductor (40) having a conductive portion whose section is oriented parallel to the axis of the stator, connected to a tab (43) for connection to a phase of the bus d supply of the stator, and at least one other conductor (30) having a conductive portion whose section is oriented perpendicular to the axis of the stator, connected to another lug (33) for connection to a phase of the supply bus of the stator. Connector according to any one of the preceding claims, the connection lugs to the conductors of the stator winding being oriented substantially radially outwards and each along a plane oriented parallel to the axis of the stator. Connector according to any one of the preceding claims, at least one of the connectors comprising a bracket for fixing a temperature sensor. Connector according to any one of the preceding claims, at least one of the conductors being made with at least one positioning hole in a mold used for molding the insulating support, this hole preferably being bordered by a circular expansion. Connector according to any one of the preceding claims, at least one of the conductors having a portion not covered by the insulating support, other than at the level of the connection tabs. A connector according to any preceding claim, the power bus connection tabs having apertures and nuts crimped therein. Connector according to any one of the preceding claims, the insulating support comprising on one face at least one positioning stud, better still two positioning studs whose free ends are coplanar and preferably located in the same plane as a third surface of support of the support, so as to form a triangle for positioning the connector. Connector according to any one of the preceding claims, at least one (51) of the stator winding connection lugs being connected to a flat part oriented perpendicularly to the axis of the stator by a first 90° elbow curved around an axis contained in a plane perpendicular to the axis of the stator and a second 90° bend extending in the plane of the leg (51). Connector according to any one of the preceding claims, at least one of the supply bus connection lugs being connected to a flat part oriented perpendicularly to the axis of the stator by a bent part (35). Connector according to any one of the preceding claims, comprising a neutral conductor (20), this neutral conductor comprising three legs (21, 22, 23) for connection to the conductors of the stator winding, two of the legs (21, 22) being connected by a flat rectilinear portion (24), oriented parallel to the axis of the stator, these lugs (21, 22) being bent on the same side of the flat rectilinear portion (24), the third lug (23) being carried by a second portion (25) which passes under one of the two first lugs (22) and is connected to the flat rectilinear portion (24) by a first 90° bend (25a) directed in a direction opposite to the stator, this first bend (25a) extending in the plane of the flat rectilinear portion (24), said second portion (25) having a second bend (25b) at 90° oriented in a direction opposite to the two legs (21, 22), which connects a flat part (25c) located in the plane of the first bend (25a) and a flat part (25d) extending in an opposite direction to the two legs (21, 22), the flat part (25d) being connected to the third leg (23) via a third bend ( ^25e ) at 90° in a direction opposite to the stator and a fourth bend (25f) at 90°. Connector according to any one of the preceding claims, comprising a phase U conductor (40), comprising a tab (41) for connection to a stator winding conductor and a tab (43) for connection to the phase U of the power bus. supply to the stator, the tabs (41, 43) being connected by a portion (44) which is generally oriented parallel to the axis of the stator, the tab (43) for connection to the power supply bus being oriented horizontally and being connected to one end of this portion (44) by a 90° bend (44a), the portion (44) having a rectilinear flat part (44b) which extends towards the bend (44a) by a part (44c) making a slight angle with the part (44b), the tab (41) for connection to the stator winding being connected to the part (44b) by a first elbow (44d) followed by a second elbow (44e), the first elbow (44d) being curved around an axis parallel to the axis of the stator while the second elbow (44e) extends in the same plane as the part (44b). Connector according to any one of the preceding claims, comprising a phase V conductor (50) comprising a tab (51) for connection to a stator winding conductor and a tab (53) for connection to the phase V of the power supply bus stator, the tabs (51, 53) being connected by a curved portion (52) which extends mainly perpendicular to the axis of the stator, the bus connection tab (53) being connected to the portion (52) by a bent part (54) and the lug (51) for connection to the stator winding by a first elbow (54a) at 90° followed by a second elbow (54b) at 90°, the first elbow (54a) being curved around an axis contained in a plane perpendicular to the axis of the stator and the second elbow (54b) extending in the plane of the leg (51). Connector according to any one of the preceding claims, comprising a phase W conductor (30) comprising a lug (31) for connection to the stator winding conductors and a lug (33) for connection to the phase W of the power supply bus of the stator, the lugs (31, 33) being connected by a flat curvilinear portion (34), the flat of which is oriented perpendicular to the axis of the stator, the lug (33) for connection to the bus being oriented parallel to the flat of the portion (34), and being connected to the latter by a bent portion (35), the tab (31) for connection to the stator winding being connected to the portion (34) by a first elbow (34a) curved around an axis contained in a plane perpendicular to the axis of the stator and by a second elbow (34b) extending in the plane of the tab (31). Stator (100) of an electric machine, in particular an external stator, comprising a winding whose conductors are connected to a connector (1) according to any one of the preceding claims.