DEVICE FOR ELECTRICAL CONNECTION BETWEEN AN ELECTRICAL MACHINE AND A POWER ELECTRONICS MODULE

Description

[0001] The present invention relates to the field of electrical engineering and more specifically concerns an electrical connection device between an electrical machine and a power electronics module.

[0002] In an electric or hybrid electric vehicle, the traction / propulsion electric motor is powered by alternating current supplied by a power electronics module, which is itself powered by direct current from a high-voltage battery, meaning one with a voltage of several hundred volts. The traction / propulsion electric motor is generally a polyphase electric machine used in either motor or generator mode, depending on the vehicle's use. The power electronics module houses an inverter and possibly a charger used when charging the high-voltage battery.

[0003] However, the engine compartment of a hybrid electric vehicle must house, in addition to an electric motor, a power electronics module, and a high-voltage battery, the components of another powertrain, such as an internal combustion engine and a gearbox. The engine compartment is therefore quite large and requires its various components to be arranged very closely together. This necessitates designing electrical connections between these components that take up as little space as possible. To connect the outputs of the electric motor and the power electronics module, it is common practice, for example, to extend the outputs of the power electronics module by bending them to make contact with the outputs of the electric motor, which consumes space within the engine compartment.

[0004] Furthermore, in the case where the electric machine has two stators, the number of electrical connections of the electric machine with the power electronics module is doubled, which complicates the task of providing access to each of these connections for their assembly / disassembly, without increasing the volume to be left free in the engine compartment to allow this access.

[0005] US documents 2020 / 313373 A1 and US 2020 / 195083 A1 describe known earlier connection devices.

[0006] The present invention remedies at least in part the drawbacks of the prior art, by providing an electrical connection device between an electrical machine and a power electronics module, an electrical machine and power electronics module assembly, and a method for assembling the electrical connection device, which allow simplified assembly of the connections between the electrical machine and the power electronics module, while requiring very little space for their assembly or disassembly.

[0007] To this end, the invention proposes an electrical connection device for electrically connecting an electrical machine and a power electronics module, the electrical connection device comprising: a plurality of phase conductor bars, suitable for connection to the electrical machine, and a corresponding plurality of power supply conductor bars, suitable for connection to the power electronics module, said pluralities comprising pairs of a portion of a phase conductor bar and a portion of a supply conductor bar, the portions per pair being distant and parallel to each other, the electrical connection device being characterized in that said portions comprise connection terminals and in that the electrical connection device comprises: a plurality of conductive pads electrically connecting the connection terminals of the pairs, the conductive pads being intended to pass through at least one orifice of a wall of the electrical machine, and a plurality of retaining elements for the electrically connected connection terminals, at least one conductive pad being traversed by one of the retaining elements.

[0008] Thanks to the invention, the electrical connections between the power electronics module and the electrical machine, in the form of power conductive bars, are very short and therefore compact, and allow an operator to easily assemble or disassemble them.

[0009] Indeed, this configuration of the power electronics device according to the invention allows the power electronics module and the electrical machine to be electrically connected without their respective outputs having to overlap at the point of contact, thus eliminating the need to bend the power conductor bars to achieve this connection. The electrical machine comprises, for example, one or more stators whose connections to the power electronics module all benefit from these conductive pads, enabling each stator connection to be electrically connected to a power supply connection of the power electronics module. Preferably, in this case, each conductive pad connects one stator connection of each stator to a power supply connection.It must therefore be understood that pairs of busbar sections can include one pair formed from a power supply busbar section and a phase busbar section from one stator, and another pair formed from the same power supply busbar section and a phase busbar section from another stator.

[0010] Furthermore, the invention applies to a single-phase or polyphase electrical machine.

[0011] According to an advantageous feature of the electrical connection device according to the invention, it comprises an electrically insulating overmolding holding at least two of the conductive pads together.

[0012] In one embodiment, the electrically insulating overmolding includes means for positioning the plurality of phase conductor bars. This allows an operator to mount several conductive pads onto the phase conductor bars simultaneously, without any offset between the conductive pads and the connection terminals of the phase conductor bars. Preferably, the electrically insulating overmolding retains all the conductive pads within a single block of insulating material, inserted into an opening in the wall of the electrical machine by a single-direction movement.

[0013] The positioning means are, for example, formed by a lug adapted to position the portions of phase conductor bars along a principal direction of elongation of the phase conductor bus sections. Alternatively, the positioning means are adapted to position, in addition to or instead of, the portions of power supply conductor bars along the principal direction of elongation of the conductor bus sections.

[0014] According to an advantageous feature of the electrical connection device according to the invention, the electrically insulating overmolding comprises, in addition to or instead of positioning means, centering means for at least one of the conductive pads on at least one of the connection terminals. These centering means assist in positioning the conductive pads on the connection terminals of the power supply or phase conductor bars, preferably in a direction different from the positioning assistance provided by the positioning means.

[0015] The centering means include, for example, at least one groove suitable for receiving at least one corresponding rib of an insulating cover for at least one of the plurality of conductive bars. Alternatively, the centering means include at least one rib suitable for fitting into a corresponding groove of an insulating cover for at least one of the plurality of conductive bars.

[0016] In one embodiment, the connection device according to the invention further comprises at least one nut mounted securely to at least one of the connection terminals of the phase conductor busbar portions, and the connection terminal is interposed between one of the conductor pads and the nut, the retaining elements comprising at least one screw mounted in the conductor pad and screwed into the nut.

[0017] Preferably, the conductive pads have a length greater than one dimension of the electrically insulating overmolding in a principal elongation direction of the conductive pads. This facilitates electrical contact between the conductive pads and the connection terminals of the power or phase busbars.

[0018] In one embodiment of the invention, the electrical machine comprises two stators, the plurality of phase conductor bars comprising two conductor bars per phase, connected together at one end of one of the conductor pads, the other end of the conductor pad being connected to a corresponding portion of a supply conductor bar. The connection of said two conductor bars per phase to said end of one of the conductor pads is made, for example, via a portion of one of the two phase conductor bars, this portion being able, for example, to include a nut.

[0019] The invention also relates to an assembly of an electrical machine and an electronic power module, characterized in that it further comprises a device for electrically connecting the electrical machine with the electronic power module according to the invention.

[0020] The invention also relates to a method for assembling an electrical connection device of an electrical machine with a power electronics module according to the invention, comprising the steps of: electrical connection of the plurality of power supply busbars to the power electronics module, electrical connection of the plurality of phase busbars to a stator of the electric machine, insertion of the conductive pads into at least one orifice in the wall of the electric machine, positioning of the connection terminals of the portions of power supply busbars opposite the conductive pads, and assembly of the retaining elements in the conductive pads.

[0021] In embodiments of the invention in which the electrical machine comprises two stators and the retaining elements each comprise a screw mounted in a conductive stud and screwed into a nut, a method for assembling an electrical connection device of an electrical machine with a power electronics module according to the invention comprises the steps of: electrical connection of the plurality of power supply busbars to the power electronics module, electrical connection of the first phase busbars of the plurality of phase busbars to one of the stators of the electrical machine, the connection terminals of the portions of the first phase busbars each being secured to a nut, electrical connection of the second phase busbars of the plurality of phase busbars to the other of the stators of the electrical machine and superposition of the connection terminals of the portions of the second phase busbars with the connection terminals of the portions of the first phase busbars, on the side opposite the nuts, insertion of the conductive pads into at least one hole in the wall, positioning of the connection terminals of the portions of the power supply busbars opposite the conductive pads, and screwing screws into said nuts,the screws passing through the connection terminals of the power supply busbar sections, the conductive pads, the connection terminals of the first phase busbar sections, and the connection terminals of the second phase busbar sections.

[0022] In these methods of assembling the connection device according to the invention, and in the whole according to the invention: The insertion of the conductive pads into the machine wall opening is preferably accomplished by a single, combined movement of an electrically insulating overmolding that holds the conductive pads together, along a first direction. The positioning of the connection terminals of the power supply busbar sections opposite the conductive pads is accomplished by a single, combined movement along a second direction orthogonal to the first. Specifically, this positioning step is performed by inserting the plurality of power supply busbars into a hole in the electrical machine wall, separate from the opening in the machine wall.The assembly process therefore allows the electric machine and the power electronics module to be connected in the engine compartment of a vehicle in just two overall movements and one assembly or screwing step, which facilitates this connection in a very small space.

[0023] The assembly according to the invention and the assembly methods according to the invention have advantages similar to those of the electrical connection device according to the invention and vice versa.

[0024] Other features and advantages of the invention will become apparent from the following description on the one hand, and from several illustrative and non-limiting examples of embodiments given with reference to the attached schematic drawings on the other hand, in which: [ Fig.1 ] is a perspective view of an electrical connection device according to the invention, in one embodiment of the invention, [ Fig.2 ] is a cross-sectional view of part of the electrical connection device of the [ Fig.1 ], [ Fig.3 ] illustrates, through two perspective views, the overmolded conductive pads of the electrical connection device of the [ Fig.1 ], [ Fig.4 ] represents steps in a process for assembling an electrical connection device according to the invention, in one embodiment of the invention, [ Fig.5 ] represents a step in the assembly process of the [ Fig.4 ], corresponding to an insertion of the conductive pads of the [ Fig.3 in an electrical machine, [ Fig.6 ] represents in cross-section the overmolding of the pads of the [ Fig.3 ] positioned on phase conductor bars of the electrical machine after the [ Fig.5 ], And [ Fig.7 ] represents in cross-section the electrical connection device according to the invention assembled in an electrical machine after the steps of the assembly process of the [ Fig.5 ].

[0025] In one example of use of the invention, a power electronics module (not shown) is connected on the one hand to a traction battery of an electric vehicle, and on the other hand to an electric machine 12 (shown [ Fig.5 ]) which it supplies with three-phase current. The electric machine 12 is in this example an electric traction machine for the electric vehicle. The electrical connection of the power electronics module to the electric machine 12 is made via an electrical connection device 1 according to the invention, shown in the [ Fig.1 ].

[0026] The electrical connection device 1 according to the invention comprises a plurality 3 of supply conductor bars U, V, W intended to be connected to the power electronics module, and a plurality 5 of phase conductor bars intended to be connected to the electrical machine 12 (represented [ Fig.5 These conductive bars are also commonly called "bus bars" and can carry a current on the order of tens of amperes. The U, V, and W power supply conductive bars are each designed to be connected to one of the power supply phases at the output of the power electronics module.

[0027] The electrical machine 12 comprising two stators 128 and 129 (visible [ Fig.5 ]), the plurality 5 of phase-conducting bars comprises first phase-conducting bars U1, V1, W1 intended to be connected to the stator 128 and second phase-conducting bars U2, V2, W2 intended to be connected to the stator 129. Furthermore, in this embodiment of the invention, the electrical machine 12 is an axial flux machine.

[0028] A person skilled in the art will be able to adapt this embodiment to a variant of the invention in which the electrical machine 12 is single-phase or polyphase with more than three phases, and / or in which the electrical machine 12 comprises a single stator or more than two stators, by adapting the number of supply busbars and phase busbars of the electrical machine accordingly. The invention is also applicable to use involving a radial flux electrical machine.

[0029] Returning to the [ Fig.1 The plurality 3 of supply busbars U, V, W and the plurality 5 of phase busbars U1, V1, W1, U2, V2, W2 define pairs of parallel busbar segments 31, 51, spaced apart. Each pair consists of a segment 51 of a phase busbar U1, V1, W1, U2, V2, or W2 and a segment 31 of a supply busbar U, V, or W. In this embodiment of the invention, each supply busbar U, V, or W comprises a segment 31 paired with a segment 51 of the first phase busbar U1, V1, or W1, or with a segment 51 of the second phase busbar U2, V2, or W2.

[0030] In each of these six pairs of sections 31, 51, the supply busbar section 31 (U, V, or W) has a connection terminal 33 positioned at a distance from a connection terminal of the phase busbar section 51 of the pair, i.e., from a connection terminal 53 of the first phase busbar section 51 (U1, V1, or W1, respectively), or from a connection terminal 59 of the second phase busbar section 51 (U2, V2, or W2, respectively). The connection terminals 33, 53, 59 of the busbar sections 31, 51 are in the form of flat conductive rings.

[0031] In order to connect together the portions 31, 51 of each pair of portions 31, 51 of conductive bars, conductive pads 10 are shown [ Fig.2 ], allow the distance separating these portions 31, 51 to be bridged. More specifically, in this embodiment of the invention, each conductive pad 10 electrically connects the connection terminal 59 of the portion 51 of the second phase conductor bus U2, V2, or W2 to the connection terminal 33 of the portion 31 of the power supply conductor bus respectively U, V, or W. The connection terminals 59 of the portions 51 of the second phase conductor bus U2, V2, or W2 are each in contact with a connection terminal 53 of a portion 51 of the first phase conductor bus respectively U1, V1, or W1, which allows the portions 31 of the power supply conductor bus U, V, or W to be electrically connected to the portions 51 of the first phase conductor bus respectively U1, V1, or W1.

[0032] Each of these conductive assemblies in which a connection terminal 33 of a portion 31 of a power supply conductor busbar, a conductive pad 10, a connection terminal 59 of a portion 51 of a second phase conductor busbar, and a connection terminal 53 of a portion 51 of a first phase conductor busbar are successively in contact, is held so assembled by means of a screw 7 passing through the conductive pad 10. The head of the screw 7 compresses the connection terminal 33 of a portion 31 of a power supply conductor busbar of each of these assemblies and screws into a nut 8 welded to the connection terminal 53 of the portion 51 of the first phase conductor busbar U1, V1, or W1 of this assembly, on the opposite side to the connection terminal 59 of a portion of the second phase conductor busbar respectively U2, V2, or W2 of this assembly.

[0033] The screws 7 are means of retaining the electrical connection device 1. Alternatively, other means of retaining can be used, for example pins passing through each conductive pad 10 and locking under the connection terminal 53 of the portion 51 of the first phase conductor bar U1, V1, or W1, by means of retractable lugs arranged in the pins.

[0034] To facilitate electrical contact between the connection terminal 33 of a portion 31 of a conductor bus U, V, or W and the corresponding conductor pad 10, the latter has a shoulder 102 at its end which comes into contact with this connection terminal 33. Similarly, to facilitate electrical contact between the connection terminal 59 of a portion of a second phase conductor bus U2, V2, or W2 and the corresponding conductor pad 10, the latter has a shoulder 104 at its end which comes into contact with this connection terminal 59.

[0035] The conductive pads 10 each extend longitudinally along a principal elongation direction corresponding, when the electrical connection device 1 is assembled and connected to the electrical machine 12, to a radial direction R, orthogonal to the portions 31 of the power supply conductor bars and 51 of the phase conductor bars of the electrical connection device 1. This radial direction R refers to the radial direction of the electrical machine 12, orthogonal to an axial direction L parallel to the axis of rotation of the electrical machine 12. The axial direction L also corresponds to a principal elongation direction of the portions 31 and 51 of the conductor bars when the electrical connection device 1 is assembled and connected to the electrical machine 12. The direction orthogonal to this axial direction L and to the radial direction R is called the transverse direction T.

[0036] To facilitate the assembly of the electrical connection device 1, the conductive pads 10 are held together in an electrically insulating overmold 9. This electrically insulating overmold 9 forms a block from which the shoulders 102 and 104 of the conductive pads 10 protrude, in their principal elongation direction.

[0037] The plurality 3 of supply conductor bars U, V, W itself includes an insulating protection 35 overmolded to these supply conductor bars. Similarly, the first phase conductor bars U1, V1, W1 include an insulating protection 55 overmolded around them, and the second phase conductor bars U2, V2, W2 include an insulating protection 57 overmolded around them.

[0038] The electrically insulating overmolding 9 includes a lug 92 which serves as a stop during movement along the axial direction of the portions 51 of second phase conductive bars U2, V2, W2, aimed at superimposing their connection terminals 59 on the corresponding connection terminals 53 of the portions 51 of first phase conductive bars U1, V1, W1.

[0039] The lug 92 thus provides a means for positioning the second phase conductor bars U2, V2, W2. Furthermore, by being interposed between the overmolding 55 of the first phase conductor bars and the connection terminals 59 of the second phase conductor bars, the lug 92 also serves to position the conductive pads 10 on the connection terminals 53 of the portions 51 of the first phase conductor bars U1, V1, W1. Alternatively, the electrically insulating overmolding 9 also includes a similar positioning means to facilitate the positioning of the power supply conductor bars U, V, W.

[0040] As seen on the [ Fig.3 ], the electrically insulating overmolding 9 also has grooves 94 extending along the axial direction L and intersecting the lug 92 which extends along the electrically insulating overmolding 9 in the transverse direction T. These grooves 94 allow the conductive pads 10 to be centered on the connection terminals 53 of the first phase conductor bars U1, V1, W1, by means of ribs 572 (visible figures 5 And 6 ) corresponding to the insulating protection 57, fitting into the grooves 94.

[0041] The grooves 94 are therefore centering means for the conductive pads 10 on the connection terminals 53. Alternatively, these centering means are ribs and the insulating protection 57 has corresponding grooves. In another variant, the electrically insulating overmolding 9 also has similar centering means, cooperating with the insulating protection 55 of the second phase conductor bars U1, V1, W1, or cooperating with the insulating protection 35 of the power supply conductor bars U, V, W, to center the conductive pads 10 on their respective connection terminals 59 or 33.

[0042] We now describe, in relation to the [ Fig.4 ], an assembly method 2 according to the invention, of the electrical connection device 1 connecting the electrical machine 12 with the power electronics module.

[0043] A first step 21 of the process is the electrical connection of the plurality 3 of U, V, W power supply conductor bars to the power electronics module.

[0044] A second step 22 of the process is the electrical connection of the first phase conductor bars U1, V1, W1 to the corresponding stator 128 of the electrical machine 12.

[0045] A third step 23 of the process is the electrical connection of the second phase conductor bars U2, V2, W2 to the corresponding stator 129 of the electrical machine 12. In this third step 23, the connection terminals 59 of the portions 51 of the second phase conductor bars U2, V2, W2 are superimposed on the connection terminals 53 of the portions 51 of the first phase conductor bars U1, V1, W1, on the side opposite the nuts 8.

[0046] Of course the order of the electrical connection steps is modifiable, the superposition of the connection terminals 53 and 59 of the first and second phase conductor bars taking place after their respective electrical connections to the stators 128 and 129.

[0047] A fourth step 24 of the process, represented [ Fig.5 [ ] is the insertion of the conductive pads 10 into an orifice 124 in a wall 122 of the electrical machine 12, the orifice 124 allowing access, in the radial direction R, to the connection terminals 53 and 59 of the first and second phase conductive bars U1, V1, W1, U2, V2, W2. The orifice 124 is here arranged on the top of an interconnection box made in a radial extension of a housing 121 of the electrical machine 12, housing the stator 129, the other stator 128 being housed in a housing 123 of the electrical machine 12.

[0048] This insertion is therefore achieved primarily by a movement in the radial direction R, that is, in the radial direction R without significant movement in the other directions. In this fourth step 24, the position along the axial direction L of the conductive pads 10 is ensured by the lug 92, and the position along the transverse direction T of the conductive pads 10 is ensured by the grooves 94 cooperating with the ribs 572, as shown [ Fig.6 ]. The lug 92 also serves as a keying device, allowing the operator to turn the block formed of the conductive pads 10 and the electrically insulating overmolding 9 in the correct direction before its insertion into the orifice 124.

[0049] The fifth step 25 is the positioning 25 of the connection terminals 33 of the portions 31 of the supply conductor bars U, V, W opposite the conductive pads 10, by passing the portions 31 of these supply conductor bars through a hole 126 in the wall 122, shown [ Fig.7 This step 25 is mainly accomplished by a movement in the axial direction L of the electrical machine 12 towards the power electronics module, i.e., without significant movement in the other directions. The hole 126 is arranged on a surface parallel to the transverse direction T and radial direction R of the wall 122, and the insulating protection 35 of the power supply busbars is surrounded by a sealing gasket (not shown) which hermetically seals the hole 126 during this positioning step 25.

[0050] In an alternative embodiment, step 25 is carried out by moving the power electronics module towards the electric machine 12 in the axial direction L.

[0051] Finally, the last step 26 of the assembly method 2 according to the invention is the securing by screwing the connection terminals 33, 53 and 59 together, using the screws 7 which lock into the nuts 8. Each screw passes through a connection terminal 33 of a portion 31 of the supply conductor bus U, V, or W, a conductor pad 10, a connection terminal 53 of a portion 51 of the first phase conductor bus respectively U1, V1, or W1 and a connection terminal 59 of a portion 51 of the second phase conductor bus respectively U2, V2, or W2. It should be noted that in this embodiment of the invention, prior to the electrical connection steps 22 and 23, the electrical machine 12 is closed by screwing the housing 123 which houses the stator 128 against the housing 121 which houses the other stator 129, a rotor mounted on a rotor shaft also being housed between the two stators 128, 129 in these housings 121 and 123.Indeed, on the electric machine 12, the electrical connection of the first and second conductive bars to the stators 128 and 129 is made from the outside of the casing of the electric machine 12. Other variants are of course conceivable with electric machines in which the electrical connection of the phase conductive bars is made before the closing of their casings.

[0052] Of course, the invention is not limited to the examples just described and many modifications can be made to these examples without departing from the scope of the invention.

Claims

1. Electrical connection device (1) intended to electrically connect an electrical machine (12) and a power electronics module, the electrical connection device (1) comprising: - a plurality (5) of phase busbars (U1, V1, W1, U2, V2, W2), able to be connected to the electrical machine (12), and - a corresponding plurality (3) of power supply busbars (U, V, W), able to be connected to the power electronics module, said pluralities (3, 5) comprising pairs consisting of a phase busbar (U1, V1, W1, U2, V2, W2) portion (51) and a power supply busbar (U, V, W) portion (31), the portions (31, 51) in each pair being spaced apart and parallel to one another, said portions (31, 51) comprise connection terminals (33, 53, 59) and in that the electrical connection device (1) comprises: - a plurality of conductive pads (10) electrically connecting the connection terminals (33, 53, 59) of the pairs, the conductive pads (10) being intended to pass through at least one orifice (124) in a wall (122) of the electrical machine (12), and - a plurality of holding elements (7) for holding the electrically connected connection terminals (33, 53, 59), characterized in that at least one conductive pad (10) is passed through by one of the holding elements (7).

2. Electrical connection device (1) according to Claim 1, comprising an electrically insulating overmolding (9) that holds at least two of the conductive pads (10) together.

3. Electrical connection device (1) according to Claim 2, wherein the electrically insulating overmolding (9) comprises positioning means (92) for positioning the plurality of phase busbars (U1, V1, W1, U2, V2, W2).

4. Electrical connection device (1) according to Claim 3, wherein the positioning means (92) are formed by a lug able to position the phase busbar (U1, V1, W1, U2, V2, W2) portions (51) in a primary direction of elongation (L) of the phase busbar (U1, V1, W1, U2, V2, W2) portions (51).

5. Electrical connection device (1) according to any one of Claims 2 to 4, wherein the electrically insulating overmolding (9) comprises centering means (94) for centering at least one of the conductive pads (10) on at least one of the connection terminals (53).

6. Electrical connection device (1) according to Claim 5, wherein the centering means (94) comprise at least one groove able to receive at least one corresponding rib (572) of an insulating protection (55) of at least one of the pluralities (5) of busbars (U1, V1, W1).

7. Electrical connection device (1) according to any one of Claims 1 to 6, furthermore comprising at least one nut (8) mounted integrally with at least one of the connection terminals (53) of the phase busbar (U1, V1, W1) portions (51), and wherein the connection terminal (53) is interposed between one of the conductive pads (10) and the nut (8), the holding elements (7) comprising at least one screw mounted in the conductive pad (10) and screwed into the nut (8).

8. Electrical connection device (1) according to any one of Claims 2 to 7, wherein the conductive pads (10) have a length greater than a dimension of the electrically insulating overmolding (9) in a primary direction of elongation (H) of the conductive pads (10).

9. Electrical connection device (1) according to any one of Claims 1 to 8, wherein, with the electrical machine (12) comprising two stators (128, 129), the plurality (5) of phase busbars (U1, V1, W1, U2, V2, W2) comprises two busbars per phase, connected together at one end of one of the conductive pads (10), the other end of the conductive pad (10) being connected to a corresponding portion (31) of a power supply busbar (U, V, W).

10. Assembly of an electrical machine (12) and power electronics module, characterized in that it furthermore comprises an electrical connection device (1) for electrically connecting the electrical machine (12) to the power electronics module according to any one of Claims 1 to 9.

11. Method for assembling an electrical connection device (1) for electrically connecting an electrical machine (12) to a power electronics module according to any one of Claims 1 to 9, comprising the following steps: - electrically connecting (21) the plurality of power supply busbars (U, V, W) to the power electronics module, - electrically connecting (22, 23) the plurality of phase busbars (U1, V1, W1, U2, V2, W2) to a stator (128, 129) of the electrical machine (12), - inserting (24) the conductive pads (10) into the at least one orifice (124) in the wall (122) of the electrical machine (12), - positioning (25) the connection terminals (33) of the power supply busbar (U, V, W) portions (31) so as to face the conductive pads (10), and - assembling (26) the holding elements (7) in the conductive pads (10).