FR3054751A1 - ROTATING ELECTRIC MACHINE HAVING PHASE OUTPUTS PLACED BY CLAMPING AGAINST CONDUCTIVE TRACKS - Google Patents

Abstract

The invention relates primarily to a rotating electrical machine comprising: - a bearing (18), - a stator (16) carried by said bearing (18), said stator (16) being provided with a stator body (43) and a winding having a plurality of phase windings (48), each phase winding (48) having an end forming a phase output (50), and - an electronic power module (51), characterized in that each phase output (50) is mounted wedged between an insulating support (54) bearing against said bearing (18) and a corresponding connection track (62) electrically connected to said power electronic module (51), said jamming of each output phase (50) being obtained by axial clamping said power electronic module (51) on said bearing (18) via at least one fastener.

Description

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

Extension request (s)

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

FR 3 054 751 - A1 (64) ROTATING ELECTRIC MACHINE PROVIDED WITH PHASE OUTPUTS PLATED BY TIGHTENING AGAINST CONDUCTIVE TRACKS.

©) The invention relates mainly to a rotary electric machine comprising:

- a bearing (18),

- a stator (16) carried by said bearing (18), said stator (16) being provided with a stator body (43) and a winding having a plurality of phase windings (48), each winding of phase (48) having one end forming a phase output (50), and

- an electronic power module (51), characterized in that each phase output (50) is mounted wedged between an insulating support (54) bearing against said bearing (18) and a corresponding connection track (62) electrically connected to said electronic power module (51), said wedging of each phase output (50) being obtained by axial clamping of said electronic power module (51) on said bearing (18) via at least one fixing member.

ROTATING ELECTRIC MACHINE PROVIDED WITH PHASE OUTPUTS PLATED BY TIGHTENING AGAINST CONDUCTIVE TRACKS

The invention relates to a rotary electrical machine provided with phase outputs clamped against conductive tracks.

The invention finds a particularly advantageous, but not exclusive, application in the field of alternators for motor vehicles. Such an alternator transforms mechanical energy into electrical energy and can be reversible. Such a reversible alternator is called an alternator starter and makes it possible to transform electrical energy into mechanical energy, in particular for starting the heat engine of the vehicle. The invention can also be implemented with an electric motor.

In a manner known per se, an alternator or an alternator-starter comprises a casing and, inside thereof, a claw rotor, integral in rotation with a shaft, and a stator which surrounds the rotor with the presence of 'an air gap.

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 in the stator body and form buns protruding 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. These windings are polyphase windings whose ends corresponding to phase outputs are connected to an electronic power module comprising in particular a rectifier bridge in the case of an alternator.

In order to ensure the electrical connection of the phase outputs with the electronic power module, the phase outputs are conventionally fixed on lugs, which are screwed onto corresponding connectors of the electronic power module.

However, in certain alternator-starter configurations, access to the connection zones on the electronic power module can be made difficult due to the presence, imposed by the motor vehicle manufacturer, of a wall for the support of the machine. extending opposite the fixing interfaces.

The invention aims to allow the connection between the phase outputs and the electronic power module regardless of the configuration of the alternator support.

To this end, the invention proposes a rotary electric machine 15 comprising:

- a step,

a stator carried by said bearing, said stator being provided with a stator body and a winding having a plurality of phase windings, each phase winding having one end forming a phase output, and

- an electronic power module, characterized in that each phase output is mounted wedged between an insulating support bearing against said bearing and a corresponding connection track electrically connected to said electronic power module, said wedging of each phase output being obtained by axial tightening of said electronic power module on said bearing via at least one fixing member.

The invention thus makes it possible to facilitate the establishment of connections between the phase outputs and the connection tracks due to the contacts obtained during the mounting of the electronic power module on the bearing of the machine. The connections can then be made whatever the shape of the alternator support. In addition, due to the removal of the fixing lugs, the invention is of economic interest.

According to one embodiment, an elastic element is mounted compressed between said connection track and an end face of said electronic power module. This allows the mounting clearances of the system to be absorbed and the fastening member to be kept in tension to maintain the pressure force between the connection track and the corresponding phase output.

According to one embodiment, said connection track belongs to a connection support.

According to one embodiment, said connection track is extended by a tab having a fixing interface on the side of its free end to be fixed on said electronic power module. This allows a remote connection between the phase outputs of the machine and the electronic power module.

According to one embodiment, said connection track and said tab have an L-shape. This makes it possible to provide a remote connection of the connection track along a radial orientation face of the electronic power module.

According to one embodiment, said tab and said connection track are overmolded by a plastic portion.

According to one embodiment, said phase output is folded back against said insulating support.

According to one embodiment, said insulating support comprises means for retaining lateral of said phase output.

According to one embodiment, said rotary electrical machine comprises a plurality of connection supports connected to each other by said elastic element.

In one embodiment, said connection supports are connected together by thermoforming of the elastic element on said overmolded plastic portion of each connection support.

In one embodiment, said connection supports are interconnected by snapping said elastic element onto said overmolded plastic portion of each connection support.

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 a rotary electrical machine according to the present invention;

FIG. 2a shows a detailed sectional view illustrating the connection between a phase output and a connection track connected to the electronic power module;

Figure 2b is a sectional view along the axis C-C of Figure 2a;

FIG. 3a is a perspective view of an electronic power module mounted on the rear bearing of the rotary electric machine according to the present invention;

FIG. 3b is a perspective view showing the rear face of the electronic power module comprising the connection tracks;

Figure 4 is a perspective view illustrating the folded positioning of the phase outputs against the rear bearing of the rotary electric machine according to the invention;

Figures 5a and 5b are perspective views showing a set of connection supports according to the invention.

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

FIG. 1 shows a compact and 25 polyphase alternator 10, in particular for a motor vehicle. The alternator 10 is able to transform mechanical energy into electrical energy and may be reversible. Such a reversible alternator, called an alternator-starter, makes it possible to transform electrical energy into mechanical energy in particular for starting the heat engine of the vehicle.

This alternator 10 comprises a casing 11 and, inside thereof, a claw rotor 12 mounted on a shaft 13, and a stator 16, which surrounds the rotor 12 with the presence of an air gap between the outer periphery of the rotor 12 and the internal periphery of the stator 16. The axis X along which the shaft 13 extends forms the axis of rotation of the rotor 12.

The casing 11 has front 17 and rear 18 bearings carrying the stator 16. The bearings 17, 18 are hollow in shape and each carry a ball bearing centrally for the rotational mounting of the shaft 13.

More specifically, the rotor 12 comprises two pole wheels 24, 25 each having a flange 28 of transverse orientation provided at its outer periphery with claws 29 for example of trapezoidal shape and axial orientation. The claws 29 of one wheel 24, 25 are directed axially towards the flange 28 of the other wheel. The claws 29 of a pole wheel 24, 25 penetrate into the space existing between two claws 29 adjacent to the other pole wheel, so that the claws 29 of the pole wheels 24, 25 are nested relative to each other.

A cylindrical core 30 is interposed axially between the flanges 28 of the wheels 24, 25. In this case, the core 30 consists of two half-cores each belonging to one of the flanges 28. This core 30 carries on its outer periphery a winding d excitation 31 wound in an insulator 32 inserted radially between the core 30 and the coil 31.

The shaft 13 may be force-fitted into the central bore of the pole wheels 24, 25. On the side of its front end, the shaft 13 may include a threaded part for fixing a pulley 35. The pulley 35 belongs to a movement transmission device with at least one belt between the alternator 10 and the engine of the motor vehicle.

The rear bearing 18 carries a brush holder 38 provided with brushes 39 intended to rub against rings 40 of a collector 41 to supply the winding of the rotor 12.

Furthermore, the stator 16 comprises a body 43 in the form of a pack of sheets provided with notches equipped with insulating notches for mounting the phases of the stator 16. Each phase comprises at least one winding 48 passing through the notches of the stator body 43 and forms, with all the phases, a front bun 46 and a rear bun 47 on either side of the stator body 43.

The phase windings 48 are obtained for example from a continuous wire covered with enamel or from conductive elements in the form of pins electrically connected to each other for example by welding.

As can be seen in FIG. 2a, each phase winding 48 has one end forming a phase output 50 connected to an electronic power module 51. This module 51 notably includes a rectifier bridge constituted for example by diodes or MOSFET type transistors.

As illustrated in FIG. 4, the phase outputs 50 are each folded back against an electrically insulating support 54, in support, preferably fixed on the rear bearing 18. Each insulating support 54 comprises lateral retaining means 55 of the output phase 50. These retaining means 55 are for example constituted by side walls of a housing 56 formed in the support 54 and intended to receive a corresponding phase output 50. Advantageously, the insulating supports 54 are mechanically connected to each other via a connecting strip 57 in order to facilitate their installation on the rear bearing 18.

Furthermore, as is clearly visible in FIG. 3a, 3b, 5a, and 5b, connection supports 61 each include a connection track 62 intended to come into contact with a corresponding phase output 50 as well as a tab 63 located in the extension of runway 62.

Each tab 63 has a fixing interface 64 on the side of its free end, that is to say on the side opposite its zone of connection with the connection track 62. The fixing interface 64 allows the tab 63 to to be fixed on the electronic power module 51. The fixing interface 64 could for example take the form of an opening allowing the passage of a fixing member 67 of the screw type to establish contact between a portion of the tab 63 and a corresponding conductive portion of the module 51, as shown in Figures 2a and 3a.

Preferably, the connection track 62 and the tab 63 are made in one piece from an electrically conductive material. The track 62 and the lug 63 have an L shape. This makes it possible to provide a remote connection of the connection track 62 along a face of radial orientation of the module 51 relative to the area of attachment of the connection support 61 located on a side face of axial orientation of the module 51.

In addition, in order to ensure electrical insulation, each connection support 61 has a plastic portion 68 molded around the fixing tab 63 and the connection track 62. The plastic portion 68 may form flanges 69, visible in FIGS. 2b and 5b, intended to extend on either side of the phase output 50 in order to ensure its lateral retention once the assembly has been carried out.

As can be seen in FIGS. 5a and 5b, the connection supports 61 can be mechanically connected to each other by an elastic element 71. The elastic element 71 can be obtained for example by a strip of plastic material whose elastic effect is obtained by producing undulations with alternating depressions 72 and vertices 73.

The connection supports 61 can be connected together by thermoforming of the elastic element 71 on the plastic portion 68 molded from each connection support 54. To this end, a stud 76 from one face of each plastic portion 68 opposite the connection track 62 cooperates with a corresponding opening 77 produced in a recess 72 of the elastic element 71.

Alternatively, the connection supports 61 are connected together by snap-fastening of the elastic element 71 on the plastic portion 68 molded from each connection support 54.

As is clear from FIGS. 2a and 2b, each phase output 50 is mounted wedged between the insulating support 54 bearing against the rear bearing 18 and a corresponding connection track 62 electrically connected to the electronic power module 51. The wedging of each phase output 50 is obtained by axial tightening of the electronic power module 51 on the rear bearing 18 via at least one fixing member 78, such as a screw or a tie rod visible in FIG. 3a.

The axial tightening has the effect of compressing the elastic element 71 between the connection track 62 and the end face 79 of the electronic power module 51. The elastic element 71 then exerts an axial force by reaction on the connection support. 61 to maintain contact between the connection track 62 and the phase output 50. The elastic element 71 in this case bears against a radial face 79 of a heat sink 80 carrying positive rectifying elements.

The use of the elastic element 71 thus makes it possible to absorb the mounting clearances of the system and to keep the fixing member 78 in tension to maintain the pressure force between the connection track 62 and the phase output 50 corresponding.

In an alternative embodiment, the connection track 62 is not produced in a connection support 61 but belongs to the electronic power module 51 in the form of an integrated track of electronic circuit.

The invention has been described with reference to an alternator 10 or an alternator-starter, but it can also be implemented with an electric motor or any other electric machine comprising a winding provided with phase outputs 50 intended to be connected to a electronic power module 51.

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.

Claims (11)

1. Rotating electric machine (10) comprising: - a bearing (18), - a stator (16) carried by said bearing (18), said stator (16) being provided with a stator body (43) and a winding having a plurality of phase windings (48), each winding of phase (48) having one end forming a phase output (50), and - an electronic power module (51), characterized in that each phase output (50) is mounted wedged between an insulating support (54) bearing against said bearing (18) and a corresponding connection track (62) electrically connected to said electronic power module (51), said wedging of each phase output (50) being obtained by axial clamping of said electronic power module (51) on said bearing (18) via at least one fixing member (78). 2. Rotating electric machine according to claim 1, characterized in that an elastic element (71) is mounted compressed between said connection track (62) and an end face (79) of said electronic power module (51). 3. Rotating electric machine according to claim 1 or 2, characterized in that said connection track (62) belongs to a connection support (61). 4. Rotating electric machine according to claim 3, characterized in that said connection track (62) is extended by a tab (63) having a fixing interface (64) on the side of its free end for fixing on said electronic module of power (51). 5. Rotating electric machine according to claim 4, characterized in that said connection track (62) and said tab (63) have an L shape. 6. Rotating electric machine according to claim 4 or 5, characterized in that said tab (63) and said connection track (62) are overmolded by a plastic portion (68). 7. Rotating electric machine according to any one of claims 1 to 6, characterized in that said phase output (50) is folded against said insulating support (54). 8. Rotating electric machine according to any one of claims 5 to 7, characterized in that said insulating support (54) comprises lateral retaining means (55) of said phase output (50). 9. rotary electric machine according to claims 2 and 3, characterized in that it comprises a plurality of connection supports îo (61) connected together by said elastic element (71). 10. rotary electrical machine according to claims 6 and 9, characterized in that said connection supports (61) are interconnected by thermoforming of the elastic element (71) on said plastic portion (68) molded from each connection support (61). 11. A rotary electrical machine according to claims 6 and 9, characterized in that said connection supports (61) are interconnected by snap-fastening of said elastic element (71) onto said plastic portion (68) molded from each connection support ( 61). 1/4 2/4