FR3053543A1 - ROTATING ELECTRIC MACHINE HAVING AN INTERCONNECTOR FIXED ON THE STATOR BODY - Google Patents

Abstract

The invention relates mainly to a rotating electrical machine, in particular for a motor vehicle, comprising: - a stator (10) comprising a body (11) composed of a plurality of plates (13) stacked axially on one another, and a winding (12) having a plurality of windings (21), and - an interconnector (25) electrically connected to ends of said windings (21) of said winding (12), characterized in that said interconnector (25) is fixed on said stator body (11).

Description

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

Extension request (s)

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

ROTATING ELECTRIC MACHINE PROVIDED WITH AN INTERCONNECTOR FIXED ON THE STATOR BODY.

FR 3 053 543 - A1 (57) The invention relates mainly to a rotary electrical machine, in particular for a motor vehicle, comprising:

a stator (10) comprising a body (11) composed of a plurality of sheets (13) stacked axially on one another, and a winding (12) comprising a plurality of windings (21), and

- An interconnector (25) electrically connected to the ends of said windings (21) of said winding (12), characterized in that said interconnector (25) is fixed to said stator body (11).

ROTATING ELECTRIC MACHINE PROVIDED WITH AN INTERCONNECTOR FIXED ON THE STATOR BODY

The invention relates to a rotary electrical machine provided with an interconnector fixed to the stator body.

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.

to The rotor has a body formed by a stack of sheet 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.

Furthermore, the stator is mounted in a casing configured to carry the shaft in rotation, for example by means of bearings. The stator comprises a body provided with a plurality of teeth defining notches, and a winding inserted in the notches of the stator. The winding is obtained for example from continuous wires covered with enamel or from conductive elements in the form of pins connected together by welding. Alternatively, the machine phases are formed from individual coils each wrapped around a stator tooth.

According to certain configurations, the phases of the machine are coupled in star or in triangle using an interconnector having connection lugs on which the ends of the wires of the winding are welded. However, it has been observed that the junction zones tend to deteriorate, or even break, when the machine is used in a severe vibratory environment.

The invention aims to effectively remedy this drawback by proposing a rotary electrical machine, in particular for a motor vehicle, comprising:

a stator comprising a body composed of a plurality of sheets stacked axially on top of each other, and a winding comprising a plurality of windings, and

- an interconnector electrically connected to the ends of said 5 windings of said winding, characterized in that said interconnector is fixed to said stator body.

The invention thus makes it possible to guarantee that the interconnector is held against the stator body avoiding any relative displacement between these two elements in order to preserve the junction zones between the ends of the windings and the interconnector in a severe vibratory environment.

According to one embodiment, said rotary electrical machine comprises at least one fixing member passing right through a part of said interconnector.

According to one embodiment, said fixing member crosses a foot of said interconnector in surface contact with an axial end face of said stator body.

According to one embodiment, said fixing member consists of a rivet.

According to one embodiment, said rivet is provided with a head resting against a foot of said interconnector.

According to one embodiment, said foot comprises an insert against which said head of said rivet bears.

According to one embodiment, said sheets of said stator body are held together only by means of a plurality of fixing members ensuring the fixing of said interconnector on said stator body.

According to one embodiment, said interconnector comprises a plurality of connection tabs extending along an internal periphery of said interconnector.

According to one embodiment, said connection tabs are welded to the ends of the windings of said winding.

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.

FIG. 1 shows an exploded perspective view of the stator and of the interconnector of the rotary electric machine according to the invention illustrating the positioning of the fastening rivets of the interconnector on the stator body;

Figure 2 is a top view of the stator and the interconnector in an assembled state;

to Figure 3 is a partial sectional view illustrating the integration of an insert in a foot of the interconnector.

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

FIG. 1 shows a polyphase stator 10 comprising a body 11 of axis X and 15 a winding 12. The stator body 11 is composed of a plurality of sheets stacked axially on one another. The stator body 11 has teeth 16 distributed angularly in a regular manner on an internal periphery of a cylinder head 17.

These teeth 16 delimit notches 20, so that each notch 20 is delimited by two successive teeth 16. The yoke 17 thus corresponds to the full external annular portion of the body 11 which extends between the bottom of the notches 20 and the external periphery of the stator 10.

The notches 20 open axially into the axial end faces of the body 11. The notches 20 are also open radially towards the inside of the body 11.

The coil 12 comprises a plurality of windings 21 constituted by coils each wound around a tooth 16. Each coil 21 is formed from an electrically conductive wire covered with a layer of electrically insulating material such as enamel. A coil insulator 22 can be inserted between each coil 21 and the corresponding tooth 16.

In order to ensure coupling between the different phases of the machine, an interconnector 25 is electrically connected to the ends of the coils 21. For this purpose, the annular interconnector 25 comprises a plurality of connection lugs 26 extending along its internal periphery and welded to the ends of the coils 21. These tabs 26 come from connection traces on which the body 29 of the interconnector 25 is overmolded made of an electrically insulating material, for example plastic material.

The body 29 comprises a plurality of feet 32 in surface contact with an axial end face of the stator body 11, in this case the yoke 17. These feet 32 are angularly spaced apart from each other in a regular manner. There is thus a clearance between two successive feet 32 allowing the passage of an air flow to improve the cooling of the electric machine.

In addition, the interconnector 25 is fixed to the stator body 11. For this purpose, a plurality of fixing members 33 each pass right through a part of the interconnector 25, in this case a stand 32, as well as the stator body 11. Preferably, as can be seen in FIG. 2, a fixing member 33 is installed at each end of the leg 32 in order to obtain a homogeneous distribution of the forces of plating of the interconnector 25 against the stator body 11.

Advantageously, these fixing members 33 are constituted by rivets inserted in axial openings 36 of corresponding shape made in the stator body 11 and the feet 32 of the interconnector 25. The openings 36 of a foot 32 and of the body 11 are positioned in coincidence with each other to allow the passage of the rivets 33.

Each rivet 33 is provided with a head 37 bearing against a leg 32. In order to avoid excessive deformation of the material of the interconnector 25, the leg 32 may include a metal insert 40 against which the head 37 bears. of the rivet 33, as shown in FIG. 3.

The end of the rivets 33 protruding axially from the stator body 11 could be deformed, for example by snap-fastening to maintain the assembly.

According to a first embodiment, the sheets 13 of the stator body 11 are held together only by means of the plurality of fixing members 33 ensuring the fixing of the interconnector 25 on the stator body 11.

According to a second embodiment illustrated in FIG. 2, a distinction is made between the rivets 33 'ensuring only the fixing of the sheets 13 of the stator body to 11 and the rivets 33 ensuring the fixing of the interconnector 25 on the stator body 11.

It should be noted that the rotor of the machine, not shown in the figures, may comprise a body formed by a stack of sheets of sheets kept 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.

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, variants, 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 one another.

Claims (9)

1 rotating electrical machine, in particular for a motor vehicle, comprising: a stator (10) comprising a body (11) composed of a plurality of 5 sheets (13) stacked axially on one another, and a winding (12) comprising a plurality of windings (21), and - An interconnector (25) electrically connected to the ends of said windings (21) of said winding (12), characterized in that said interconnector (25) is fixed on said stator body (11). 2. Rotating electric machine according to claim 1, characterized in that it comprises at least one fixing member (33) passing right through a part of said interconnector (25). 3. Rotating electric machine according to claim 2, characterized in that said fixing member (33) passes through a foot (32) of said interconnector (25) in surface contact with an axial end face of said stator body (11) . 4. Rotating electric machine according to any one of claims 1 to 3, characterized in that said fixing member (33) is 20 constituted by a rivet (33). 5. Rotating electric machine according to claims 3 and 4, characterized in that said rivet (33) is provided with a head (37) bearing against a foot (32) of said interconnector (25). 6. Rotating electric machine according to claim 5, characterized in that said foot (32) comprises an insert (40) against which said head (37) of said rivet (33) bears. 7. Rotating electric machine according to any one of claims 1 to 6, characterized in that said sheets (13) of said stator body (11) are held together only by means of a 30 plurality of fixing members (33) ensuring the fixing of said interconnector (25) on said stator body (11). 8. rotary electrical machine according to any one of claims 1 to 7, characterized in that said interconnector (25) comprises a plurality of connection tabs (26) extending along a 5 internal periphery of said interconnector (25). 9. Rotating electric machine according to claim 8, characterized in that said connection tabs (26) are welded to the ends of the windings (21) of said coil (12). 2/2