Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/04—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for rectification
  • H02K11/049—Rectifiers associated with stationary parts, e.g. stator cores
  • H02K11/05—Rectifiers associated with casings, enclosures or brackets
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/30—Structural association with control circuits or drive circuits
  • H02K11/33—Drive circuits, e.g. power electronics
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/14—Means for supporting or protecting brushes or brush holders
  • H02K5/141—Means for supporting or protecting brushes or brush holders for cooperation with slip-rings

Definitions

• the invention particularly relates to a brush holder for a rotating electrical machine.
• a reversible machine is a rotating electrical machine able to work in a reversible manner, on the one hand, as an electric generator in alternator function and, on the other hand, as an electric motor for example to start the engine of the motor vehicle .
• a rotating electrical machine comprises a rotor rotatable about an axis and a fixed stator surrounding the rotor.
• the rotor, the stator and the shaft are mounted in a housing which also supports an electronic assembly controlling the operation of the machine.
• alternator mode when the rotor is rotating, it induces a magnetic field to the stator which transforms it into electric current to power the vehicle electronics and recharge the battery.
• motor mode the stator is electrically powered and induces a magnetic field driving the rotor in rotation.
• the integration of these two electrical networks inside the vehicle causes the rotating electrical machine must be able to handle these different voltages.
• the two electrical networks have the same ground potential, said chassis weight, which is connected in particular to the carcass of the vehicle.
• the excitation of the machine is made with the second electrical network which has a voltage level higher than that of the first network conventionally used in the vehicle.
• the control of the machine via the motor control is done through the first network.
• the electronic unit of the machine is connected to both electrical networks.
• the first network also makes it possible to reduce the mass to the electronic assembly of the machine.
• the path for connecting the mass to the electronic assembly is not direct and may be longer or shorter and therefore inductive depending on the arrangement of the vehicle.
• An offset between the chassis ground and the mass brought back to the electronic assembly can be created in particular because of voltage drops in the power supply circuit of the machine. Such an offset causes electromagnetic compatibility problems with the motor environment.
• the present invention aims to reduce the disadvantages of the prior art and in particular to avoid problems of electromagnetic compatibility.
• the subject of the present invention is therefore a rotary electrical machine, in particular for a motor vehicle.
• the machine comprises active parts comprising in particular a rotor and a stator; a housing surrounding the active parts.
• the machine further comprises a brush holder comprising at least one brush for supplying electrical power to one of the active parts, at least one electrical excitation trace of said brush and a housing formed of an electrically insulating material, the casing surrounding at least a part the excitation trace and having a housing housing at least partly the broom.
• the machine comprises an electronic assembly comprising a control module adapted to drive said machine and an excitation trace connecting the excitation trace of the brush holder to said control module.
• the electronic assembly comprises a mass trace, said ground trace being electrically connected to the control module and to the housing via the brush holder.
• control module has a direct connection with the ground potential. This improves the electromagnetic compatibility of the machine with the engine environment. Thus, the machine is better protected from external disturbances and it does not emit disturbance to the external environment.
• the brush holder is mounted on the housing.
• the casing is at an electric potential of mass.
• the brush holder comprises a ground trace which is electrically connected, on the one hand, to the housing and, on the other hand, to the ground trace of the electronic assembly.
• a ground trace which is electrically connected, on the one hand, to the housing and, on the other hand, to the ground trace of the electronic assembly.
• the mass trace of the brush holder is housed at least partly in a housing formed in the housing of said brush holder.
• the housing is opening so that the mass trace has a first connection portion with the ground trace of the electronic assembly and a second connection portion with the housing, the first connection portion and the second connecting portion being, respectively, formed by a first face and a second face of the ground trace electrically connected to each other.
• the mass trace is overmolded at least in part in the housing of the brush holder.
• the mass trace has a shape of rectangular section, the first face and the second face being opposite faces relative to each other.
• the two faces are axially opposed.
• both sides extend parallel to one another.
• the mass trace of the electronic assembly comprises a first connection portion with the mass trace of the brush holder and a second connection portion with the control module.
• the mass trace is reported to the control module.
• the ground trace can be integrated in the control module.
• the electronic assembly comprises a housing on which is disposed the control module and wherein are molded, at least in part, the mass trace and the excitation trace.
• the electronic assembly and, in particular, the control module is arranged so as to manage two different electrical networks.
• control module is connected to a first electrical network via an engine control module and to a second electrical network for the excitation of the machine.
• the electric excitation trace of the brush holder has a first connection portion with the electrical excitation trace of the electronic assembly and a second connection portion with the brush.
• the electrical excitation trace of the electronic assembly has a first connection portion with the electric excitation trace of the brush holder and a second connection portion with the control module.
• the surface of the mass trace of the brush holder is smaller than the surface of the excitation trace of said brush holder and the surface the mass trace of the electronic assembly is smaller than the surface of the excitation trace of said electronic assembly.
• the first connection portion of the mass trace of the electronic assembly has a surface, and in particular a radial section, smaller than that of the first connection portion of one or the other of the traces. exciting said electronic assembly.
• the connection face of the mass trace of the brush holder has a surface, and in particular a radial section, smaller than that of the first connection portion of one or the other of the excitation traces. said brush holder.
• the different surfaces of the mass traces may be greater than those of the excitation traces.
• the surface of the first face of the mass trace of the brush holder is smaller than the surface of the first connection portion of the excitation trace of said brush holder.
• the surface of the first connection portion of the ground trace of the electronic assembly is smaller than the surface of the first connection portion of the excitation trace of said electronic assembly.
• an electrical contact between the mass trace of the brush holder and the ground trace of the electronic assembly and an electrical contact between the ground trace of said brush holder and the housing are made by means of a same fixing device.
• the brush holder is mounted on the housing by means of the fixing device.
• the electronic assembly is mounted on the housing by means of the fixing device.
• the housing comprises a front bearing and a rear bearing, the brush holder and the electronic assembly being mounted on said rear bearing.
• an electrical contact between the mass trace of the brush holder and the ground trace of the electronic assembly is achieved by screwing. This contact is, especially a direct contact.
• an electrical contact between the mass trace of the brush holder and the housing is made by screwing. This contact is, especially a direct contact.
• the housing of the electronic assembly, the housing of the brush holder and the housing each comprise an opening for the passage of the fixing device to mechanically connect them together.
• Such a fixing device makes it possible to mechanically connect said parts and to electrically connect said traces together. This reduces the size of the machine,
• the fastening device is a screw or a tie rod.
• the respective openings of the electronic assembly, the brush holder and the housing are positioned vis-à-vis each other.
• the electronic assembly comprises a clamping piece made of electrically insulating material and positioned so as to exert pressure on the excitation trace and the ground trace of the electronic assembly.
• the clamping piece ensures good electrical contact between the tracks of the electronic assembly and those of the brush holder.
• the machine comprises at least one electrical insulation device for electrically isolating the mass traces of the excitation traces.
• the electrical insulation device is for example carried by the clamping piece. Alternatively, such a device can be carried by the housing of the brush holder.
• the housing comprises at least one bearing and a stud projecting from the bearing, the stud being arranged to allow the mounting of the brush holder and to allow electrical contact between the housing and the mass trace. said brush holder.
• the brush holder comprises two brushes respectively arranged in two housings of the housing and respectively connected to two traces of electrical excitation.
• one of the brushes is at a positive electrical potential of the second power grid and the other brush is at a negative electrical potential or mass of the second power grid.
• the rotating electrical machine comprises a collector mounted on one of the active parts and in that the brush is in contact with a collector trace of the collector for the power supply of said active part.
• the brush holder and the electronic assembly are distinct from each other.
• the brush holder and the electronic assembly form two separate elements so that the electronic assembly is not integrated in the brush holder.
• the rotating electrical machine can advantageously form an alternator, an alternator-starter or a reversible machine.
• FIG. 1 represents, schematically and partially, a cross-sectional view of a rotating electrical machine according to an exemplary implementation of the invention
• FIG. 2 represents, schematically and partially, a part-view of part of the machine of FIG. 1,
• FIG. 3 represents, schematically and partially, a perspective view from above of an example of the brush holder of FIG. 1,
• FIG. 4 represents, schematically and partially, a perspective view in transparency of the brush holder of FIG. 3;
• FIG. 5 represents, schematically and partially, a perspective view from below of an example of the brush holder of FIG. 1,
• FIG. 6 represents, schematically and partially, a perspective view of an example of a part of the electronic assembly of FIG. 1,
• FIG. 7 represents, schematically and partially, a perspective view of an exemplary trace configuration of the electronic assembly of FIG. 6;
• FIG. 8 represents, schematically and partially, a perspective view of an example of a clamping piece of the electronic assembly of FIG. 1;
• FIG. 9 represents, schematically and partially, a sectional view of the zone of attachment of the electronic assembly and of the brush holder on the bearing according to the example of FIG. 1, and
• FIG. 10 shows a simplified electrical diagram of the machine of Figure 1 in the vehicle.
• FIG. 1 represents a rotating electrical machine 10 which is compact and polyphase, in particular for a motor vehicle.
• This rotating electrical machine 10 transforms mechanical energy into electrical energy, into alternator mode, and can operate in motor mode to transform electrical energy into mechanical energy.
• This rotary electrical machine 10 is, for example, an alternator, an alternator-starter or a reversible machine.
• the rotary electrical machine 10 comprises a housing 1 1. Inside this housing 1 1, it further comprises a shaft 13, a rotor 12 integral in rotation with the shaft 13 and a stator 15 surrounding the rotor 12. The rotational movement of the rotor 12 is around an X axis.
• the axial, radial, external and internal denominations refer to the axis X crossing at its center the shaft 13.
• the axial direction corresponds to the X axis while the radial orientations correspond to the planes concurrent, and in particular perpendicular, to the X axis.
• the external or internal denominations are assessed with respect to the same axis X, the inner denomination corresponding to an element oriented towards the axis, or closer to the axis with respect to a second element, the external denomination designating a distance from the axis.
• the housing 1 1 comprises a front bearing 16 and a rear bearing 17 which are assembled together.
• These bearings 16, 17 are hollow in shape and each carries a respective ball bearing 18, 19 for the rotational mounting of the shaft 13.
• a pulley 20 is fixed on a front end of the shaft 13, at the front bearing 16, for example by means of a nut bearing against the bottom of the cavity of this pulley. This pulley 20 transmits the rotational movement to the shaft 13 or to the shaft 13 to transmit its rotational movement to the belt.
• the rear end of the shaft 13 carries a manifold 22.
• This manifold comprises a body made of electrically insulating material and slip rings 21 overmolded in said body.
• the slip rings 21 have an annular shape and are rotated with the rotor 12.
• Brushes 23 belonging to a brush holder 24 are arranged so as to rub on the slip rings 21.
• the brush holder 24 is electrically connected to an electronic assembly 36 controlling the voltage applied to the brushes.
• the front bearing 16 and the rear bearing 17 may further comprise substantially lateral openings for the passage of air in order to allow the cooling of the rotary electric machine by air circulation generated by the rotation of a fan. before 25 on the front axial face of the rotor 12, that is to say at the level of the front bearing 16 and a rear fan 26 on the rear axial face of the rotor, that is to say at the level of the bearing rear 17.
• the bearings may include conduits for the passage of a coolant.
• the rotor 12 is a claw rotor. It has two pole wheels 31. Each pole wheel 31 is formed of a flange 32 and a plurality of claws 33 forming magnetic poles.
• the flange 32 is of transverse orientation and has, for example, a shape substantially annular.
• This rotor 12 further comprises a cylindrical core 34 which is interposed axially between the pole wheels 31.
• this core 34 is formed of two half-cores each belonging to one of the pole wheels.
• the rotor 12 comprises, between the core 34 and the claws 33, a coil 35 comprising, here, a winding hub and an electric winding on this hub.
• the slip rings 21 belonging to the collector 22 are connected by wire bonds to said coil 35.
• the rotor 12 may also comprise magnetic elements interposed between two adjacent claws 33,
• the stator 15 comprises a body 27 in the form of a pack of sheets with notches, for example of the semi-closed or open type, equipped with slot insulator for mounting an electric winding. 28.
• This coil 28 passes through the notches of the body
• the coil 28 is connected, for example, in a star or in a triangle.
• the winding 28 is formed of one or more phases. Each phase comprises at least one conductor passing through the notches of the stator body 27 and forms, with all phases, the buns.
• the coil 28 is electrically connected to an electronic assembly 36.
• the electronic assembly 36 comprises at least one electronic power module for controlling a winding phase
• the electronic assembly 36 comprises a housing 62 that can accommodate the power module and / or the control module 61.
• This housing 62 is mounted on a heat sink which has fins extending projecting and channeling a cooling air flow of the various modules.
• the heat sink may include cooling fluid circulation ducts for cooling different modules.
• the heat sink may include both fins and cooling ducts.
• the rotor 12 When the electric winding 35 is electrically powered from the brushes 23, the rotor 12 is magnetized and becomes an inductor rotor with formation of magnetic north-south poles at the claws. This inductor rotor creates an alternating induced current in the stator induced when the shaft 13 is rotating.
• the power module of the electronic assembly 36 then transforms this AC induced current into a direct current, in particular to supply the loads and the consumers of the on-board network of the motor vehicle as well as to recharge its battery in alternator mode.
• the vehicle needs a more powerful electrical network than that conventionally used.
• the vehicle may comprise two separate batteries as shown in Figure 10.
• the first battery 76 feeds a first power grid conventionally used in motor vehicles.
• the second battery 77 supplies a second electrical network having electrical potentials different from those of the conventional network.
• the second battery 77 is more powerful than the first battery 76.
• the electrical potentials of the first electrical network vary between 0V and 12V and those of the second electrical network vary between 0V and 60V and in particular between 0V and 48V.
• the two batteries are interconnected by an electronic converter DC / DC 43 said DC-DC converter.
• the excitation of the rotating electrical machine 10 operates with the second electrical network.
• the supply of the rotor coil 35 is carried out by the second network which is directly connected to the electronic assembly 36 of the machine 10 and in particular to the control module 61.
• the vehicle also comprises a motor control module 41 for controlling the machine 10 according to what the user wants.
• This module 41 transmits control signals to the electronic assembly 36 of said machine and in particular to the module 61.
• This module 41 operates with the first power grid.
• the electronic assembly 36, and in particular the control module 61 is arranged so as to be able to manage these two different electrical networks.
• the vehicle carcass is connected to a chassis ground potential 75 which is the same as the ground potential of the DC / DC converter 43.
• the casing 1 1 which is in contact with the carcass is also at ground potential.
• the control module 61 is connected to ground via its connection with the engine control module 41. However, this connection being made by means of son that can be longer or shorter depending on the vehicle layout, the mass brought down may be slightly different from the chassis weight 75. For reasons of electromagnetic compatibility, the control module 61 needs to have a more direct access to the chassis mass 75.
• the brush holder 24 is used to bring the chassis mass 75 back to the control module 61.
• the vehicle may comprise a single battery with a power level equivalent to that of the second battery 77.
• a transformer may be used to create the other power grid to power the engine control module.
• the brush holder 24 is mounted on the rear bearing 17 around the manifold 22 which is mounted at a rear end of the shaft 13.
• the electronic assembly 36 is also mounted on the rear bearing 17 and comprises a housing in which the collector 22 and the brush holder 24 are inserted at least partially.
• the brush holder 24 comprises a housing 37 made of an electrically insulating material and two brushes 23. Each brush 23 is at an electrical potential of the second network in order to supply the rotor coil 35 via the collector 22.
• the housing 37 comprises two housings 39 each in which are inserted at least partially the brushes 23. Each housing 39 is opening on a radial inner wall of the housing so that the associated brush comes into contact with the ring collector 21 corresponding.
• Each brush 23 extends in a radial direction relative to the axis X and has an inner face and an outer face radially opposite, the inner face being in contact with the associated slip ring 21.
• the brush holder 24 comprises springs 40, visible in Figure 1, arranged in the housing 39, each spring being associated with a brush 23 and exerting a force on the outer face of the associated brush.
• the force exerted is of radial direction.
• each spring 40 is in a compressed state. The force exerted by the spring on the broom ensures electrical contact between said brush and the slip ring while compensating for the wear of the brush due to the rotational movement of the ring.
• the brush holder 24 further comprises a protective cover 38 extending from the end of the housing 37 in which the housings 39 are opening.
• the protective cover 38 surrounds the collector 22 and the end of the shaft 13. The protective cover then makes it possible to isolate the respective electrical contacts between the brushes and the slip rings of the external environment.
• the brush holder 24 comprises two electrical excitation traces 44, each of which is at a different electrical potential and can feed a brush 23.
• one of the brushes is at a positive electric potential of the second electrical network and the other brush is at a negative electric potential or mass of the second electrical network.
• the excitation traces 44 are electrically isolated from each other thanks to the housing 37.
• each trace 44 has a first connection portion 45 with the electronic assembly 36, a second connection portion 46 with the associated brush 23 and a connecting portion 47 for connecting the first and the second connection portion together.
• the connecting portion 47 is entirely housed in the housing 37 of the brush holder as shown in FIG. 4.
• the second connection portion 46 is electrically connected to a braid (not shown) which is itself connected to the brush 23 associated.
• This second connection portion is housed in an end wall of the housing 37 in an apparent manner to simplify the connection with the braid.
• said second portion is positioned in the outer radial end wall of the casing 37.
• the braid is disposed inside the corresponding housing 39 and is connected to the connecting portion, for example by crimping and / or welding.
• the second connection portion could be positioned in a housing of the housing and not on its surface.
• the brush holder 24 further comprises a ground trace 64 making it possible to transmit the chassis ground 75 to the electronic assembly 32 and in particular to the control module 61.
• This mass trace 64 comprises a first connection face 65 with the electronic assembly 36, a second connection face 66 with the housing 1 1, and in particular the rear bearing 17, and a body 67.
• the ground trace is housed in a housing housing 37.
• the housing is open, in particular axially, so that the connection faces 65, 66 is arranged visibly.
• the body 67 has a shape having a substantially rectangular section, the first face 65 and the second face 66 being opposite faces of said rectangle.
• the first connection face 65 extends opposite the electronic assembly 36 and the second connection face 66 extends opposite the housing 1 January.
• said faces are axially opposed.
• the first portions 45 of the excitation traces 44 are housed in an end wall of the housing 37 in an apparent manner. Said wall is opposite the electronic assembly 36, preferably it is an axial end wall of the housing 37.
• each first connection portion 45 is in contact, preferably direct, with an associated excitation trace 48 of the electronic assembly 36.
• the first face 65 is in contact, preferably direct, with an associated ground trace 63 of the electronic assembly 36.
• the electronic assembly 36 thus comprises a ground trace 63 and two excitation traces 48. These traces make it possible to electrically connect the control module to the respective traces 44, 64 of the brush holder 24.
• the excitation traces 48 and the ground trace 63 each have a first connection portion 68 with the respective traces of the brush holder, a second connection portion 69 with the control module 61 and a connecting portion 70 for connecting the first and second connection portion together.
• the connecting portions 70 are overmolded at least partly in the housing 62 of the electronic assembly 36.
• the first portions 68 and the second portions 69 project from both sides of the
• the second connection portions 69 each have a form of connection tab cooperating with housings of the control module 61.
• the excitation traces 48 and the ground trace 63 may extend projecting directly from the control module 61.
• a fixing device 49 makes it possible to guarantee the contact between the first portions 68 of the excitation traces 48 of the electronic assembly 36 and the first portions 45 of the excitation traces 44 of the brush holder as well as the contact between the first portion 68 of the mass trace 63 of the electronic assembly 36 and the first face 65 of the ground trace 64 of the brush holder and the contact between the second face 66 of the ground trace 64 of the brush holder and the housing 1 1.
• the housing 37 of the brush holder 24 and the housing 62 of the electronic assembly 36 each comprise an opening disposed facing each other to allow the passage of the fixing device 49.
• the fixing device 49 is for example a screw or a tie rod.
• the first portions 45 of the excitation traces 44 each have a shape of a circular arc and are positioned around the opening 55 formed in the housing 37.
• the two connecting portions 45 of the excitation traces 44 are positioned symmetrically with respect to said opening.
• the mass trace 64 is disposed between said first portions 45 of the excitation traces 44.
• the surface of the first face 65 is smaller than the surface of one or the other of the first portions 45.
• the first portions 68 of the excitation traces 48 and the ground trace 63 of the electronic assembly 36 each have a shape adapted to that of the first portion 45 or the first face 65 with which it is in contact.
• the mass trace 63 is arranged between the excitation traces 48.
• the different first portions 68, 45 and the first face 65 extend substantially flat and vis-à-vis the respective portion with which it comes into contact.
• a contact grease can be added, particularly at the electrical contact between the excitation traces of the brush holder and those of the electronic assembly, to prevent corrosion of said traces.
• the electronic assembly 36 comprises a clamping piece 50 made of electrically insulating material and positioned to exert pressure on the first portions 68 to ensure good electrical contact.
• This clamping piece is positioned between a part of the fixing device 49, such as a screw head, and the tracks 48, 63 of the electronic assembly. It also makes it possible to electrically isolate the fixing device 49 from said traces 48.
• this clamping piece 50 is inserted into a housing 73 arranged in the housing 62 of the electronic assembly 36, at least part of the traces 48, 63 of the electronic assembly also extending into said housing 73.
• the housing 73 may be opening axially.
• the fixing device 49 may also comprise a washer 60 positioned between a portion of the fixing device 49 and the clamping piece 50.
• the fixing device 49 allowing electrical contact between the excitation traces 44 and the excitation traces 48 and that the electrical contact between the ground trace 64, the ground trace 63 and the rear bearing 17 also makes it possible to fix the brush holder 24 on the rear bearing 17.
• the opening of the rear bearing 17 has a threaded portion cooperating with a threaded portion of the fixing device 49.
• the opening of the rear bearing 17 is formed in a stud 42 projecting from the plateau of said bearing.
• the mass trace 64 of the brush holder is in contact with said pad and in particular with an axial end of said pad.
• the opening of the electronic assembly 36 is formed in the clamping piece 50 which is inserted in the housing 73.
• the housing 37 of the brush holder 24 comprises a fixing portion carrying the first portions 45 of the excitation traces 44, the ground trace 64 and the opening 55 through which the fixing device 49 passes.
• the fixing portion is positioned on a lateral side of the housing 37, that is to say on a portion of the brush holder extending between the two inner and outer radial ends of the housing 37.
• the fixing portion could be positioned on an outer radial end of the housing 37.
• the brush holder comprises, here, a first indexing pad 58 for indexing said brush holder on said bearing in a first direction and a second pin of indexing 59 for indexing said brush holder on said bearing in a second direction perpendicular to the first direction.
• the clamping piece 50 comprises a body and a cylinder portion 51 projecting axially from said body towards the brush holder 24 and forming an arc of circle at least partially surrounding the connections between the excitation traces 44, 48 and the mass traces 64, 63.
• the cylinder portion 51 electrically isolates said connections from the external environment.
• the housing 37 may include a groove 54 for receiving the cylinder portion 51.
• the clamping piece 50 comprises a sleeve 52 extending in axial projection from from the body of said piece to the brush holder 24.
• the sleeve is positioned between the fixing device 49 and the connections between the excitation traces 44, 48 and the mass traces 64, 63 so as to surround said fixing device 49.
• Said sleeve 52 electrically isolates the fixing device 49 which is in contact with the rear bearing 17 of said connections.
• the clamping piece 50 comprises a wall 53 projecting from the body of said piece towards the brush holder 24 between the cylinder portion 51 and the sleeve 52.
• the wall 53 extends between the two first connection portions 45 of the two excitation traces 44 to isolate them electrically with respect to each other and to avoid the formation of salt bridge.
• the housing 37 may include a cavity 46 in which the wall 53 can be inserted.
• the clamping piece 50 comprises two walls 71 positioned, each between the first face 65 of the ground trace 64 and the first portion 45 of one or other of the excitation traces 44.
• the walls 71 may extend from the sleeve 52, preferably in a substantially radial direction. Walls are used to electrically isolate the mass trace from the traces of excitation and to avoid the formation of salt bridges.
• the housing 37 may include notches 72 in which the walls 71 can be inserted respectively.
• the cylinder portion, the sleeve and the walls may be formed on the housing 37 of the brush holder 24.
• the clamping piece 50 then comprises a groove for receiving the cylinder portion, a diameter the widened opening for receiving the sleeve, a cavity and notches for receiving the walls.
• the clamping piece 50 may comprise a flange 74 projecting from the body of said piece in a direction axially opposed to the brush holder 24 and so as to at least partially surround the fixing device 49.
• the collar extends, from preferably, over the entire circumference of the body and from an outer periphery of said body. This makes it possible to protect said fixing device from the outside environment.
• the present invention finds applications in particular in the field of alternators, alternator-starters or reversible machines, but it could also apply to any type of rotating electrical machine.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Microelectronics & Electronic Packaging (AREA)
• Motor Or Generator Frames (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=59746133

Family Applications (1)

Country Status (4)

Families Citing this family (1)

Family Cites Families (8)

• 2017
  • 2017-06-20 FR FR1755624A patent/FR3067883A1/fr not_active Withdrawn
• 2018
  • 2018-06-04 CN CN201880041634.8A patent/CN111819773A/zh active Pending
  • 2018-06-04 WO PCT/EP2018/064591 patent/WO2018234023A1/fr unknown
  • 2018-06-04 EP EP18727033.5A patent/EP3642943A1/de not_active Withdrawn

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