FR3065334A1 - ROTATING ELECTRICAL MACHINE COMPRISING AN INTEGRATED NEUTRAL POINT CONNECTION INTERCONNECTOR - Google Patents

Abstract

The invention relates mainly to a rotating electrical machine (10) characterized in that it comprises: - an interconnector (51) providing an electrical connection of the neutral outputs (49) to each other, and an electrical connection of each phase output (48) with a terminal (52), - the interconnector (51) having a plurality of phase conductive tracks (62) and at least one neutral conducting track (63), - the phase conducting tracks (62) being for electrically connecting a phase output (48) with a terminal (52), - the neutral conducting track (63) being for electrically connecting the plurality of neutral outputs (49) therebetween.

Description

Holder (s): VALEO ELECTRIC EQUIPEMENTS MOTOR Simplified joint-stock company.

Extension request (s)

Agent (s): VALEO EQUIPEMENTS ELECTRIQUES MOTOR Simplified joint-stock company.

154) ROTATING ELECTRIC MACHINE INCLUDING AN INTERCONNECTOR WITH INTEGRATED NEUTRAL POINT CONNECTION.

FR 3 065 334 - A1 _ The invention relates mainly to a rotary electric machine (10) characterized in that it comprises:

an interconnector (51) ensuring an electrical connection of the neutral outputs (49) between them, and an electrical connection of each phase output (48) with a terminal (52),

the interconnector (51) comprising a plurality of phase conductive tracks (62) and at least one neutral conductive track (63),

the phase conducting tracks (62) being intended to electrically connect a phase output (48) with a terminal (52),

- the neutral conductive track (63) being intended to electrically connect the plurality of neutral outputs (49) to each other.

ROTATING ELECTRIC MACHINE COMPRISING AN INTERCONNECTOR WITH INTEGRATED NEUTRAL POINT CONNECTION

The present invention relates to a rotary electrical machine comprising an interconnector with integrated neutral point connection.

In a manner known per se, rotary electrical machines comprise a stator and a rotor secured to a shaft. The rotor may be integral with a driving and / or driven shaft and may belong to a rotating electrical machine in the form of an alternator, an electric motor, or a reversible machine capable of operating in both modes.

îo The stator is mounted in a casing configured to rotate the shaft on bearings by means of bearings. The rotor comprises a body formed by a stack of sheets of metal sheets held in the form of a package by means of a suitable fixing system. The rotor has poles formed for example by permanent magnets housed in cavities formed in the magnetic mass of the rotor. Alternatively, in a so-called salient pole architecture, the poles are formed by coils wound around the rotor arms.

Furthermore, the stator comprises a body constituted by a stack of thin sheets forming a crown, the inner face of which is provided with notches open towards the inside to receive phase windings. These windings pass through the notches and form buns projecting from either side of the stator body. The phase windings are obtained for example from a continuous wire covered with enamel or from conductive elements in the form of pins connected together by welding.

In the case where the windings are polyphase windings connected in a star, it is generally necessary to provide neutral bars whose integration into the stator is difficult. In addition, this requires carrying out welding or brazing operations on the assembly line, which increases the manufacturing time and therefore the cost of producing the electric machine.

The present invention aims to effectively remedy these drawbacks by proposing a rotary electric machine comprising:

- a rotor mounted on a shaft extending along an axis,

a stator comprising a body and a winding, the winding comprising a plurality of phase outputs and a plurality of neutral outputs,

- A bearing provided with a housing for receiving a bearing for the rotational mounting of the shaft, the bearing comprising at least one through opening for the passage of phase outputs and neutral outputs, characterized in that said rotating electric machine also comprises:

- an interconnector ensuring an electrical connection of the neutral outputs between them, and an electrical connection of each phase output with a corresponding terminal,

the interconnector comprising a plurality of phase conductive tracks and at least one neutral conductive track,

the phase conductive tracks being intended to electrically connect a phase output with a terminal,

the neutral conductive track being intended to electrically connect the plurality of neutral outputs to one another.

The invention thus makes it possible to facilitate the interconnection of the neutral outputs between them by avoiding having to resort to the use of neutral bars which are difficult to integrate into the wound stator. In addition, the brazing or welding operations can be carried out after the wound stator has been produced, which simplifies the assembly line of the rotary electric machine.

According to one embodiment, the interconnector comprises at least two conductive tracks offset axially along the axis of the shaft.

According to one embodiment, the interconnector comprises at least two conductive tracks superimposed relative to one another along the axis of the shaft.

According to one embodiment, said rotary electrical machine comprises an electronic control and / or power module arranged to be connected to the terminals of the interconnector.

According to one embodiment, said rotary electrical machine comprises means for indexing the interconnector relative to the bearing.

According to one embodiment, the indexing means consist of a protrusion extending under an area of the interconnector carrying the terminals and intended to engage inside a reception opening of corresponding shape formed in the rear bearing .

According to one embodiment, the neutral conductive tracks and the phase conductive tracks are at least partially overmolded. Preferably, the neutral conductive tracks and the phase conductive tracks are placed in position and held by at least one plastic part and covered by another plastic part or a resin during assembly of the interconnector.

According to one embodiment, the interconnector is fixed to the bearing.

According to one embodiment, the interconnector is fixed on a face of the bearing facing outwards from said rotary electric machine.

According to one embodiment, a configuration of the winding is of the three-phase type or of the double three-phase type.

According to one embodiment, said rotary electric machine is cooled by water or by oil.

According to one embodiment, said rotary electrical machine comprises a cooling chamber extending at the external periphery of the stator.

In one embodiment, seals are located at the axial ends of the cooling chamber.

According to one embodiment, the neutral conductive tracks and the phase conductive tracks have a section of rectangular shape.

According to one embodiment, a larger side of the rectangle extends in a radial plane relative to the axis.

The invention will be better understood on reading the description which follows and on examining the figures which accompany it. These figures are given only by way of illustration but in no way limit the invention.

Figure 1 is a longitudinal sectional view of the rotary electrical machine according to the present invention;

Figure 2 is a perspective view of the stator and rotor of the rotary electric machine of Figure 1;

Figure 3 is a perspective view of a rotary electrical machine according to the present invention;

FIG. 4 is a perspective view of the rotary electric machine according to the invention illustrating the configuration of the tracks inside the interconnector;

Figure 5 is a partial sectional view illustrating the axial superposition between two tracks of the interconnector according to the present invention;

Figure 6 is a perspective view of the rotary electrical machine illustrating the passage of the phase outputs and neutral outputs inside the corresponding openings made in the rear bearing;

Figure 7 is a perspective view of the interconnector according to the present invention.

Identical, similar, or analogous elements retain the same reference from one figure to another.

In the following description, a front element means an element located on the side of the end of the shaft projecting from the machine and intended to carry a pinion or a pulley, and by rear element an element located on the side opposite.

FIG. 1 shows a rotary electric machine 10 comprising a polyphase stator 11 surrounding a rotor 12 mounted on a shaft 13 extending along an axis X. The stator 11 surrounds the rotor 12 with the presence of an air gap between the internal periphery of the stator 11 and the outer periphery of the rotor 12. The stator 11 is mounted in a casing 14 provided with a front bearing 17 and a rear bearing 18. The bearings 17 and 18 each include a housing for receiving a bearing 15 so to ensure rotational mounting of the shaft 13 relative to the casing 14 of the electric machine.

This electric machine 10 may be intended to be coupled to a gearbox belonging to a traction chain of a motor vehicle. The machine 10 is able to operate in an alternator mode in particular to supply energy to the battery and to the vehicle on-board network, and in an engine mode, not only to ensure the starting of the heat engine of the vehicle, but also to participate in the traction of the vehicle alone or in combination with the engine. The power of the machine 10 can be between 10 kW and 50 kW. Alternatively, the electric machine 10 may be installed on an axle of the motor vehicle, in particular a rear axle.

More specifically, as can be seen in FIG. 2, the rotor 12 comprises a body 19 in the form of a pack of sheets. Permanent magnets 20 are implanted in cavities 21 of the body 19. In the example shown, the magnets 20 are implanted in a V configuration. Alternatively, the magnets 20 are implanted radially inside the cavities 21, the faces in vis-à-vis two adjacent magnets 20 having the same polarity. It is then a configuration with flux concentration. The magnets 20 may be made of rare earth or ferrite depending on the applications and the desired power of the machine 10.

In addition, the rotor 12 has two flanges 22 each pressed against an axial end face of the rotor body 19. These flanges 22 provide an axial retention of the magnets 20 inside the cavities 21 and also serve to balance the rotor 12 A spring 25 can be inserted inside each cavity in order to radially hold the magnets 20 inside the cavities 21.

Furthermore, the stator 11 comprises a body 23 constituted by a pack of sheets as well as a coil 24. The body 23 is formed by a stack of sheets of sheets independent of each other and maintained in the form of a pack by means of a suitable fixing system. The body 23 is provided with teeth 31 delimiting two by two of the notches 33 for mounting the winding 24 of the stator 11.

The winding 24 comprises a set of phase windings passing through the notches 33 and forming buns 36 projecting on either side of the stator body 23. The phase windings are obtained here from conductive elements in the form of pins, the ends of which are connected together, for example by welding.

As described in more detail below, the phase windings may have a star configuration of the three-phase type. These windings are intended to be connected to an electronic control and / or power module via an interconnector 51.

This module comprises power elements, such as MOSFET type transistors, connected to the phase and neutral outputs, as well as an electronic circuit for controlling said power elements.

Furthermore, as can be seen in FIG. 3, an inlet 34 and an outlet 35 for coolant are arranged to allow the circulation of the liquid inside a chamber 38 extending along the external periphery of the stator. 11 (see Figure 1). The coolant may for example be water or oil based. The chamber 38 is delimited by the external periphery of the front bearing 17 and the internal periphery of the rear bearing 18. Two seals 39 are located at the axial ends of the chamber 38 to ensure its sealing.

As can be seen in FIG. 6, the rear bearing 18 also includes a plurality of openings 47 for the passage of phase outputs 48 and neutral outputs 49 of the stator winding 24.

The interconnector 51 provides an electrical connection of the neutral outputs 49 between them, and an electrical connection of each phase output 48 with a corresponding terminal 52. These terminals 52 are intended to be connected to the aforementioned electronic control and / or power module.

The interconnector 51 is fixed to one face of the rear bearing 18 facing outwards from the electric machine 10. It will be possible to provide indexing means to guarantee correct positioning of the interconnector 51 relative to the bearing 18, in particular to guarantee the positioning of the phase outputs 48 and the neutral outputs 49 opposite the ends of the corresponding tracks of the interconnector 51.

The indexing means may consist of a protuberance 54 extending under an area of the interconnector 51 carrying the terminals 52, as shown in FIG. 7, and intended to engage inside an opening. receiving 55 of corresponding shape made in the rear bearing 18, as can be seen in FIG. 6.

In addition, the means for fixing the interconnector 51 to the bearing 18 may consist of fixing members 57, such as screws, passing through fixing holes 58 (cf. FIG. 7) formed in the interconnector 51 and located coincident with threaded holes made in the rear bearing 18.

More precisely, the interconnector 51 shown in FIG. 7 comprises a body 53 overmolded on three phase conductive tracks 62 intended to electrically connect a phase output 48 with a terminal 52 and on a neutral conductive track 63 intended to electrically connect three neutral outputs 49 between them. The body 53 is advantageously made of an insulating material, in particular plastic. The body 53 has an annular shape substantially coaxial with the shaft 13.

As illustrated in FIG. 4, each phase conductive track 62 has an end 621 connected to a terminal 52 of the interconnector

51 and a free end 622 electrically connected in particular by welding or soldering, to a corresponding phase output 48 in a phase contact zone 66. The ends 621, 622 are connected together by a connection portion 623.

Each phase track 62 is embedded in the body 53, with the exception of the free end portion 622. In this case, the free ends 622 are folded axially upward relative to the overmolded connection portion

623. The free ends 622 extend projecting from an edge of a corresponding notch 56 of the interconnector 51.

Furthermore, the neutral track 63 has a plurality of free ends 631 coming from a connection portion 632. Each free end 631 of the neutral track 63 is electrically welded to a corresponding neutral outlet 49 in a contact zone neutral 67. The free ends 631 are folded axially upwards relative to the connecting portion 632. The free ends 631 extend in projection relative to an edge of a corresponding notch 56 of the interconnector 51.

to Certain indentations 56 may have at one of their circumferential edges one end of a phase track 62 and at their opposite circumferential edge one end of a neutral track 63.

In the present case, the configuration of the winding 24 is of the three-phase type. The interconnector 51 makes it possible to ensure interconnection of the neutral outputs 49 of a single three-phase system. As a variant, the configuration of the winding 24 is of the double three-phase type. The interconnector 51 then comprises six phase conductive tracks 62 and two neutral tracks 63 ensuring the interconnection between the three neutral outputs 49 of each three-phase system.

As can be seen in particular in FIG. 5, the interconnector 51 is arranged so that there are two tracks 62, 63 offset axially along the axis X. These two tracks 62, 63 are superimposed one relative to the 'other along the axis X. In other words, there is a straight line D1 parallel to the axis X of the shaft 13 intersecting the two tracks 62, 63 stacked one on the other. The tracks 62, 63 superimposed inside the body 53 are spaced apart by a layer of insulating material constituting the body 53 of the interconnector 51.

In this case, the tracks superimposed on each other correspond to a phase track 62 and a neutral track 63. As a variant, two phase tracks could be superimposed with respect to each other. As a variant, more than two tracks, for example three or four, or all of the tracks of the interconnector 51 may be superimposed relative to each other inside the body 53 of the interconnector 51.

Advantageously, the phase tracks 62 and the neutral tracks 63 have a section of rectangular shape. The largest side of the rectangle extends in a radial plane with respect to the X axis.

In addition, preferably, the phase contact zones 66 as well as the neutral contact zones 67 are situated along the same circumference of the rear bearing 18, as shown in FIGS. 3 and 4. This makes it possible to facilitate the operation. electrical connection in the contact areas 66, 67 which can be achieved by soldering or welding with or without the addition of material.

Of course, the foregoing description has been given by way of example only and does not limit the scope of the invention from which one would not depart by replacing the various elements with any other equivalent.

Furthermore, the various features, variations, and / or embodiments of the present invention can be combined with one another in various combinations, insofar as they are not incompatible or mutually exclusive of each other.

Claims (3)

1. Rotating electric machine (10) comprising: - a rotor (12) mounted on a shaft (13) extending along an axis (X), - a stator (11) comprising a body (23) and a winding (24), the 5 winding (24) comprising a plurality of phase outputs (48) and a plurality of neutral outputs (49), - A bearing (18) provided with a housing for receiving a bearing (15) for the rotational mounting of the shaft (13), the bearing (18) comprising at least one through opening (47) for the passage phase outputs (48) and neutral outputs (49), characterized in that said rotary electrical machine (10) further comprises: - an interconnector (51) ensuring an electrical connection of the neutral outputs (49) between them, and an electrical connection of each 15 phase output (48) with a corresponding terminal (52), the interconnector (51) comprising a plurality of phase conductive tracks (62) and at least one neutral conductive track (63), the phase conducting tracks (62) being intended to electrically connect a phase output (48) with a terminal (52), 20 - the neutral conductive track (63) being intended to electrically connect the plurality of neutral outputs (49) to each other. 2. Rotating electric machine according to claim 1, characterized in that the interconnector (51) comprises at least two conductive tracks (62, 63) offset axially along the axis (X) of the shaft (13). 25 3. Rotating electric machine according to claim 2, characterized in that the interconnector (51) comprises at least two conductive tracks (62, 63) superimposed relative to one another along the axis (X) of the tree. 4. Rotating electric machine according to any one of claims 1 to 3, characterized in that it comprises a module 30 control and / or power electronics arranged to be connected to the terminals (52) of the interconnector (51). 5. Rotating electric machine according to any one of claims 1 to 4, characterized in that it comprises means for indexing the interconnector (51) relative to the bearing (18). 6. rotary electric machine according to claim 5, characterized in that the indexing means consist of a protuberance (54) extending under an area of the interconnector (51) carrying the terminals (52) and intended for s 'Engage inside a receiving opening (55) of corresponding shape made in the bearing (18). 7. Rotating electric machine according to any one of claims 1 to 6, characterized in that the neutral conductive tracks (63) and the phase conductive tracks (62) are at least partially overmolded. 8. Rotating electric machine according to any one of claims 1 to 7, characterized in that the interconnector (51) is fixed 15 on the bearing (18). 9. rotary electric machine according to any one of claims 1 to 8, characterized in that the interconnector (51) is fixed on a face of the bearing (18) facing outwards from said rotary electric machine (10). 10. Rotating electric machine according to any one of claims 1 to 9, characterized in that a configuration of the winding (24) is of the three-phase type or of the double three-phase type. 11. Rotating electric machine according to any one of claims 1 to 10, characterized in that it is cooled by water or by 25 oil. 12. Rotating electric machine according to any one of claims 1 to 11, characterized in that it comprises a cooling chamber (38) extending at the outer periphery of the stator (11). 13. Rotating electric machine according to claim 12, characterized in that seals (39) are located at the axial ends of the cooling chamber (38). 14. rotary electric machine according to any one of claims 1 to 13, characterized in that the neutral conductive tracks (63) and the phase conductive tracks (62) have a section 5 of rectangular shape. 15. Rotating electric machine according to claim 14, characterized in that a larger side of the rectangle extends in a radial plane relative to the axis (X). 1/4 3/4