WO2015170037A1

WO2015170037A1 - Overmoulded casing component of an electronic assembly for an electrical rotating machine for a motor vehicle

Info

Publication number: WO2015170037A1
Application number: PCT/FR2015/051145
Authority: WO
Inventors: Khadija El Baraka; Svetislav JUGOVIC; Farouk Boudjemai
Original assignee: Valeo Equipements Electriques Moteur
Priority date: 2014-05-05
Filing date: 2015-04-28
Publication date: 2015-11-12
Also published as: FR3020728B1; FR3020728A1

Abstract

The invention relates to a plastic overmoulded casing component of an electronic assembly (10) for an electrical rotating machine, suitable for being mounted on a lower ground plane (300) and comprising housings (101) for receiving power modules (200), a power module comprising a conductive support (2010), a power-conducting support (102) overmoulded in the casing part, the power-conducting part being connected to at least one connector (2011) of the conductive support of each power module, phase traces (103a, 103b) overmoulded in the casing component, the phase traces being suitable for connecting to phase connectors (2012a, 2012b) of the conductive support of each power module, and assembly openings (104', 104a, 104b) receiving means (114) for mounting the power modules on the casing component.

Description

OVERHEAD CASE-PIECE OF AN ELECTRONIC ASSEMBLY FOR A ROTARY ELECTRIC MACHINE FOR A MOTOR VEHICLE

DOMAI N E TECH N I A L OF THE I NVE NTI ON

The present invention relates to an over-molded piece-piece made of plastic material of an electronic assembly for a rotating electrical machine for a motor vehicle. The present invention also relates to an electronic assembly comprising such an overmolded piece-housing, and a rotating electrical machine comprising such an electronic assembly.

It finds a particular but non-limiting application in the field of automotive starter-alternators. I NV E NTI ON I N A T I N A T I N A T IO N E R T

In a motor vehicle comprising a heat engine and a rotating electrical machine such as an alternator-starter, such a machine includes, without limitation:

a rotor comprising an inductor into which an excitation current is supplied; and

a stator comprising a polyphase winding.

The alternator-starter operates in motor mode or in generator mode. It is a so-called reversible machine.

In alternator mode, also called generator mode, the machine makes it possible to transform a rotational movement of the rotor driven by the engine of the vehicle into an electric current induced in the phases of the stator. In this case, a rectifier bridge connected to the stator phases makes it possible to rectify the sinusoidal induced current in a direct current to supply consumers of the vehicle as well as a battery.

On the contrary, in motor mode, the electric machine acts as an electric motor for driving in rotation, via the rotor shaft, the engine of the vehicle. It makes it possible to transform electrical energy into mechanical energy. In this case an inverter makes it possible to transform a direct current coming from the battery into an alternating current to supply the phases of the stator so as to rotate the rotor.

Control components are used to determine the operating mode of the rotating electrical machine (motor mode or generator mode) via control signals.

The power components (bridge rectifier and inverter) are generally divided into a power module by rectifier / inverter bridge arm. Each power module is composed of:

- A piece of conductive traces overmolded type IML (IML for "Isolated Molded Leadframe" in English) contained in a high-end plastic housing capable of withstanding high temperatures. A plurality of electronic switches, typically MOSFETs, are soldered at high temperature on the circuit of conductive traces, the electronic switches of a module being intended to provide a rectifier / inverter bridge arm for a phase of the rotating electrical machine;

- A ceramic-type substrate on which are glued components (called "driver" in English) for carrying out the control of the power switches;

- A rear conductive plate, typically aluminum (called "backplate" in English), to achieve the mass of the bridge rectifier / inverter;

- A plastic cover type PPS, PBT or PA, for sealing the power module;

- Pins or "pins" of signal connection integrated into the housing and which provide a connection with an interconnection piece for a transit of power signals between the power module and a control module. Each power module is tested unitarily and then mounted on a heatsink of the electric machine by means of a plurality of screws per power module. Then, for each power module, electrical welds are made for a connection to the phases of the electrical machine and to a power inter-connector for connection to a terminal, called terminal B +, for connection to the vehicle battery and, on the other hand, laser welds for a signal pin connection to a control module. Then a deposit of silicone resin or gel is performed in order to guarantee a protection of the laser welds against the environmental aggressions and to ensure the tightness of the module. And finally, the electric machine is tested as a whole.

A disadvantage of this state of the art lies in the fact that during the final test of the electric machine as a whole, if any problem is detected for example on a power module, the whole of the electric machine must be set discarded because the removal of the welds leads to a deterioration of the electric machine.

In this context, the present invention aims to solve the aforementioned drawback.

I NV E NTI ON G ENERAL C OMMITTEE

To this end, the invention proposes a molded plastic case-part of an electronic assembly for a rotating electric machine for a motor vehicle, adapted to be mounted on a plate of lower mass and comprising:

a plurality of housings adapted to each receive a power module, a power module comprising a conductive support;

a power conductive part overmolded in the molded-over part, the power-conducting part (102) being adapted to be connected to at least one connector of the conductive support of each power module;

a plurality of phase traces overmolded in the over-molded housing part, the phase traces being adapted to be connected to phase connectors of the conductive support of each power module;

mounting holes adapted to receive mounting means for mounting each power module to the molded case member.

Thus, thanks to the plastic molded part-case of the electronic assembly, and thanks to the mechanical mounting means (the orifices in particular) of the overmolded piece-housing associated with each module, when the electric machine does not work because of for example a power module, simply dismantle the power module of the molded-case part to discard it, replace it with a new power module and test the electronic assembly then the machine electric as a whole. It is no longer necessary to discard the entire electrical machine.

According to non-limiting embodiments, the molded plastic molded part-piece may further comprise one or more additional characteristics from the following:

- The plastic material of the overmolded part-case is PPS or PBT.

- The power conducting part comprises a plurality of power connection tabs arranged parallel to the plane of the molded housing part, a power connection tab being adapted to cooperate with a power module. - The phase traces each comprise a first phase connection tab adapted to connect a power module, a first phase connection tab being positioned parallel to the plane of the molded housing part.

- The phase traces each comprise a second phase connection tab adapted to connect a phase of the stator, a first tab being positioned vertically with respect to the plane of the molded housing part.

- The molded housing part comprises first and second mounting holes, the mounting holes being adapted to mount the electronic assembly on a heatsink of the rotating electrical machine. It is also proposed an electronic assembly for a rotating electrical machine comprising:

an over-molded case-piece as briefly described above;

a plurality of power modules comprising:

a conductive support on which are mounted:

a plurality of electronic power switches;

- signal components;

said conductive support comprising:

- a power connector;

- at least two phase connectors.

It is also proposed a rotating electrical machine comprising:

- a rotor;

a stator coupled to said rotor and comprising a plurality of phases;

an electronic assembly as briefly described above, said plastic molded over-molded case-piece of said electronic assembly being adapted to be connected to the phases of said stator; a rear bearing supporting said stator; and

a sink of the rear bearing adapted to receive the lower ground plate of said electronic assembly. According to a non-limiting embodiment, said rotating electrical machine is an alternator-starter.

BRIEF DESCRIPTION OF THE FIGURES

The invention and its various applications will be better understood by reading the following description and examining the figures that accompany it. FIG. 1 represents an exploded perspective view of a non-limiting embodiment of an electronic assembly for a rotating electrical machine for a motor vehicle, said electronic assembly comprising an overmolded plastic case-piece according to the invention;

FIG. 2 represents a view from above of the overmolded case-piece of the electronic assembly of FIG. 1;

FIG. 3 represents an axial sectional view of the overmolded case member of FIG. 2;

FIG. 4 represents a radial sectional view of the overmolded case member of FIG. 3;

FIG. 5 represents a perspective view of a non-limiting embodiment of a power module of the electronic assembly of FIG. 1;

FIG. 6 represents a perspective view of a conductive support of the power module of FIG. 5;

Fig. 7 is an exploded perspective view of the overmolded plastic body member and a bottom ground plate of the electronic assembly of Fig. 1; Figure 8 shows an exploded perspective view of the assembly of the electronic assembly of Figure 1 on a heatsink of the rotating electrical machine;

Figure 9 shows a perspective view of the electronic assembly of Figure 8 assembled on the heatsink of the rotating electrical machine;

Figure 10 shows a perspective view of the electronic assembly of Figure 8 assembled on the heatsink of the rotating electrical machine comprising a control module.

DESCRIPTION OF EMBODIMENTS OF THE INVENTION

Identical elements, structure or function, appearing in different figures retain, unless otherwise specified, the same references.

The electronic assembly 10 for a rotating electrical machine is described with reference to FIGS. 1 to 10.

The rotating electrical machine is in a non-limiting example an alternator-starter. The rotating electrical machine is in this type of application used for the electrical generation and starting of the engine (with the so-called "Stop & Go" or "Stop / Start" feature in English).

As illustrated in FIG. 1, according to one nonlimiting embodiment, the electronic assembly 10 comprises:

an over-molded case-piece 100 made of plastic material (called "housing");

a plurality of power modules 200;

a plate of lower mass 300 (called backplate) adapted to receive said overmolded casing part 100 and to be mounted on a dissipator 11 of the rotating electrical machine and intended to be connected to the negative potential terminal of the vehicle battery.

The different elements of the electronic assembly 10 are described in more detail below.

Overmolded piece-case

The overmolded casing part 100 is illustrated in FIGS. 2 to 4.

Its particular function is the mechanical protection of the power modules 200 and the mechanical strength of all the power modules on the rotating electrical machine. In addition, it accommodates the interconnection with the control module.

The over-molded case-piece 100 is made of plastic material. In a non-limiting embodiment, the plastic material is PPS (Polyphenylene Sulfide), PBT (Polybutylene Terephthalate) or PPA

(Polyphthalamide).

These types of plastics are inexpensive plastics whose temperature resistance is of the order of 120 ° C to 250 ° C. It is indeed not necessary to use a high-end plastic that withstands higher temperatures because there are no electrical welds or laser welds of the power modules 200 made at the molded-case part .

The overmolded case-piece 100 comprises:

a plurality of housings 101;

a plurality of power conducting traces comprising phase traces 103a, 103b and a trace B + 102 (connected to the power terminal 107); and

mounting holes 104 ', 104a, 104b. As illustrated in FIG. 2, the housings 101 are adapted to each receive a power module 200. In the non-limiting illustrated example, there is has three housings 101 for mounting three power modules 200 in the molded housing part 100.

The power conducting part 102, also called a power trace or a power bus, allows the current to pass through the components of the power modules 200. It is overmolded in said overmolded case-piece 100 as illustrated in FIGS. section 3 and 4. It comprises a plurality of overmolded outer power connection tongues 102 ', a power connection tab 102' being associated with a power module 200. Thus, a power connection tab 102 'opens into each housing 101 and is adapted to cooperate with a power connector (described below) of a power module 200. The tongues 102 'are positioned parallel to the (horizontal) plane of the molded housing part 100; this makes it possible to reduce the vertical bulk of the electronic assembly 10.

The phase traces 103a, 103b, as illustrated in FIG. 1, are overmolded in said overmolded box-piece 100. Two phase traces 103a, 103b are associated with a power module 200. They enable each module to be connected to each other. power 200 to the phases of the stator. In the particular embodiment described here, two phase traces 103a, 103b are disposed in each housing 101 at right angles to the plane of said overmolded case-piece 100. Overmolding the phase traces 103a, 103b provides modularity as to the position of the phase outputs of the stator. It is easy to choose to overmould the traces at this or that place of the overmolded part-case according to the wishes of the electrical machine manufacturers for example and the number of phases of the machine.

The phase traces 103a, 103b respectively comprise: a first overmolded phase connection tab 103a ', 103b' adapted to connect a power module 200. Two first phase connection tabs 1 03a ', 1 03b' are adapted to cooperate with phase connectors (described below) of a power module 200. As shown in Figure 2 or 4, the first tabs 1 03a ', 1 03b' are positioned parallel to the plane of the molded housing part 100; this reduces the vertical space requirement of the electronic assembly 1 0.

a second phase connection tab 1 03a ", 1 03b" molded adapted to connect a phase of the stator. Two first phase connection tabs 1 03a ", 103b" are adapted to cooperate with phases of the stator. As shown in Figure 3, the first tabs 103a ", 1 03b" are positioned vertically relative to the (horizontal) plane of the molded case-part 1 00; this allows easy access to said tabs for connection with the phases of the stator.

The mounting holes 104 ', 104a and 104b illustrated in Figures 2 and 4, are adapted to receive mounting means 1 14 for mounting each power module 200 on said overmolded housing member 100.

Still in this particular embodiment of a machine comprising six phases, each housing January 01 has three mounting holes January 04 ', April 1 and April 1, a port 1 04' being integrated in the power tab 1 02 'and an orifice 1 04a and 1 04b being respectively integrated in each phase tab 1 03a ', 1 03b'.

As illustrated in FIG. 4, the overmolded case-piece 1 00 furthermore comprises:

first mounting orifices 1 05 adapted to mount the overmolded casing part 1 00 on a dissipator 1 1 of the rear bearing of the rotating electrical machine. These two orifices 1 05 are placed on the inner circumference of said over-molded case-piece 100; and

second mounting orifices 106 adapted to mount the over-molded case-piece 100 on the dissipator 1 1 of the rear bearing of the rotating electrical machine. These two orifices 106 are placed on the outer circumference of said overmolded case-piece 100.

It will be noted that the inner circumference of the overmolded casing member 100 is at the periphery of a location 108 for receiving the rotor shaft. The first and second mounting holes are adapted to receive mounting means such as in a non-limiting example fastening screws (not shown).

Thus, these mounting means 105-106 of the over-molded housing part make it possible to mount the set of power modules 200 on the dissipator of the rotating electrical machine. There are no longer mounting means associated with each power module. Thus, the number of mounting means is reduced, which makes it possible to optimize the volume occupied by the electronic assembly 10. These mounting means 105-106-screws make it possible to easily assemble and disassemble the over-molded case-piece 10 of the electrical machine. rotating without risk of deterioration.

It will be noted that the overmolded case-piece 100 furthermore comprises a signal bus (not illustrated) which connects in a conventional manner, in a nonlimiting example by wire bonding, to the signal components of the modules of FIG. power. The power modules are described below.

Power Module A power module 200 is illustrated in Figures 5 and 6 in non-limiting embodiments. As illustrated in FIG. 5, a power module 200 comprises:

a conductive substrate 2010 integrating three power traces, namely, a trace B +, a phase trace and a mass trace;

a plurality of electronic power switches 2020 mounted on visible power traces; and

a control circuit incorporating signal components 2030 integrated in the substrate.

The 2020 electronic power switches and the 2030 signal components are mounted on the 2010 conductive substrate.

The electronic switches are in a nonlimiting example of the MOSFET transistors, the switches of a module being intended to provide at least one rectifier / inverter bridge arm for a phase of the rotating electrical machine. In both illustrated examples, the power module 200 includes two MOSFETs for a bridge arm. It is therefore easy to adapt the electronic assembly 10 for a three-phase machine or a hexaphase machine. In the case of a three-phase machine, it is sufficient to connect only one phase connector (described below) to a phase of the stator via phase trace 103a or 103b of the overmolded case-piece 100, while in the In the case of a hexaphase machine, it is sufficient to connect the two phase connectors (described below) to two phases of the stator via two phase traces 103a and 103b of the over-molded case-piece 100.

As illustrated in Figure 6, the 2010 driver support includes:

a power connector 201 1 adapted to be connected to the power conducting part 102 of said overmolded case-piece 100, via one of its power tabs 102 ';

at least two phase connectors 2012a and 2012b adapted to be respectively connected to the phase traces 103a and 103b of said overmolded case-piece 100 via the first two corresponding tabs 103a 'and 103b'.

The 201 1 and phase 2012a, 2012b power connectors incorporate respective mounting holes 2014 ', 2014a, 2014b corresponding to the mounting holes 104', 104a, 104b of the overmolded casing member 100, namely, the orifices 2014 ', 2014a, 2014b are adapted to be respectively screwed to -vis mounting holes 104 ', 104a, 104b. In the illustrated example, a power module 100 has 3 mounting holes 2014 ', 2014a, 2014b. They allow to receive the mounting means 1 14, which are in a non-limiting example of the fixing screws.

It will be noted that the fixing screws 1 14 make it possible not only to carry out the mechanical strength of the power modules in the overmolded casing part 100 but also to perform together with the connectors 201 1 and 2012a and 2012b respectively an electrical connection between the power modules 200 and the power conducting part 102, and an electrical connection between the power modules 200 and the phase traces 103a, 103b.

The power connectors 201 1 and phase 2012a and 2012b are positioned parallel to the plane of the conductive support 2010 which reduces the overall size of the electronic assembly 10.

A power module 200 can thus be easily mounted and dismounted from the overmolded housing part 100 via the fixing screws 1 14 which fit into the mounting holes 2014 ', 2014a, 2014b and 104', 104a, 104b. It is thus possible to disassemble one or more defective power modules without damaging the rest of the electronic assembly 10 or the rotating electrical machine.

It will also be noted that the phase welds present in the state of the prior art have been replaced by mechanical means which fulfill an electrical connection function. By eliminating these phase welds, it reduces reducing the overall size of the electronic assembly since it is no longer necessary to have specific access to said phases to achieve a weld. In a non-limiting embodiment illustrated in FIGS. 5 and 6, the conductive power support 2010 of the power module 200 consists of three power conducting traces separated by an insulating (epoxy) layer and accommodating a PCB printed circuit (" Printed Circuit Board ") for the 2030 (" driver ") components of the 2020 electronic switch control. The 2020 power electronic switches are soldered directly to the visible portions of the 2040 power traces.

Thus, with this embodiment, one replaces the plurality of housings (present in the state of the prior art) plastic power modules that can hold very high temperatures, by a single housing, namely the room -molded casing 100, made of plastic material which makes it possible to hold lower temperatures, single casing in which the power modules are mounted without electrical and laser welds, the mounting on the dissipator of the electrical machine being carried out via mechanical assembly means common to all modules.

Lower mass plate

The lower ground plate 300 supports the overmolded casing part 100. The plate is in a non-limiting embodiment of aluminum and comprises an electrically insulating part (anodization for example) in order to ensure a good insulation with the conductive traces of power (leadframe) of potential B + and phases and a conductive portion for performing the ground connection of the power modules via a connection by brazed son ("wire bonding" in English) with the electronic power switches (MOSFET). As illustrated in FIG. 7, the plate 300 comprises:

third mounting holes 305 adapted to be coupled to the corresponding first mounting orifices 105 of the overmolded casing part 100. In a nonlimiting example, it comprises two orifices 305 placed on the inner circumference of said plate 300; fourth mounting orifices 306 adapted to be coupled to the corresponding second mounting orifices 106 of the overmolded casing part 100. In a nonlimiting example, it comprises two orifices 306 placed on the outer circumference of said plate 300. It will be noted that the inner circumference of the plate 300 is at the periphery of a location 308 for receiving the rotor shaft.

The third and fourth mounting orifices 305 and 306 together with mounting screws (not shown) allow mounting of the overmolded housing member 100 on the bottom ground plate 300 and on the dissipator 11 of the rear bearing of the rotating electrical machine. . Thus, all of the mounting holes 105-106 and 305-306 are adapted to mount the electronic assembly 10 on the dissipator January 1.

As illustrated in FIG. 8, the plate 300 is mounted directly on the dissipator 11. It is thus electrically connected to the general mass potential of the vehicle.

It will be recalled that in the non-limiting embodiment in which the rotating electrical machine is an alternator-starter type machine operating under a DC voltage adapted to a vehicle with a 48-volt electrical network (or any other voltage), for example, Voltage potentials B + and B- are present in the machine and correspond respectively to +48 V and 0 V of 48 Volts. It will be noted here that the B- (0 V) and the general ground potential of the vehicle are electrically connected in the rotating electrical machine.

The potential B + is connected to the electrical circuit of the vehicle through an electrical terminal 107 isolated from B-. As illustrated in FIG. 2 or 4, the power conducting piece 102 is connected to the electrical terminal 107. Conductor 102 of the overmolded casing part 100 is thus connected to the potential B +. The power modules are thus connected to the potential B + via the power conducting part 102 (the power connectors 201 1 seen previously being connected to the part 102 via the tongues 102 ').

The potential B is conventionally connected to the negative electrical terminal of the battery or batteries of the vehicle while the general mass of the vehicle is connected to the chassis thereof on which is mounted the rear bearing 1 1 of the electric machine. The lower ground plate 300 is thus connected directly to the vehicle ground since mounted on the dissipator 1 1 of the rear bearing of said machine. The plate 300 thus makes it possible to ground the conductive support 2010 of the power modules 200 when the latter are mounted in the housings 101 of the overmolded housing part 100, each support 2010 then being in contact with the plate 300.

The assembly of the different elements of the electronic assembly 10 is carried out as follows:

- Each power module 200 is mounted in the housing 101 provided for this purpose of the molded housing part 100 by the three fastening screws 1 14 inserted into the orifices 2014 ', 2014a, 2014b and 104', 104a, 104b;

the overmolded casing member 100 is mounted on the bottom mass plate 300;

- The assembly-case molded housing 100-plate 300 is mounted on the dissipator 1 1 of the rear bearing of the rotating electrical machine by means of the set screw mounting holes 305-306 and 105-106.

Of course, the sequence of the steps described above may be different. It is thus possible to mount the modules 200 in the overmolded case-piece 100 after having mounted the 100-plate-on-molded case-casing assembly 300 on the dissipator. Figure 8 illustrates an exploded assembly of the electronic assembly 10 on the dissipator 1 1 of the rear bearing of the rotating electrical machine. The dissipator 1 1 has first mounting orifices 1 15 which are found opposite the third orifices 305 and first orifices 105 respectively of the lower ground plate 300 and the overmolded housing part 100, and second orifices 1 16 which are found vis-à-vis the fourth orifices 306 and 1 second orifices 06 respectively of the lower ground plate 300 and the over-molded housing part 100.

Figure 9 and Figure 10 show the electronic assembly 10 assembled on the dissipator 1 1 of the rear bearing of the rotating electrical machine.

Figure 10 further illustrates in a non-limiting embodiment an additional element 400 which comprises a control module. The control module comprises components for controlling the rotating electrical machine and in particular the adjustment of the machine by controlling the power modules via the signal bus. The control components being known to those skilled in the art, they are not described in detail in the following description. Of course, other embodiments may be made in which the control module is for example disposed above the over-molded case-piece on a plane parallel to said overmolded case-piece.

Thus, the electronic assembly 10 described makes it possible to operate the alternator-starter. The latter includes:

a rotor;

a stator coupled to said rotor and having a plurality of phases; an electronic assembly 10 according to any one of the preceding characteristics, the over-molded case-piece 100 made of plastic material of said electronic assembly 10 being adapted to be connected to the phases of said stator; a rear bearing supporting said stator; and

a dissipator on which the electronic assembly 10 rests.

Of course, the description of the invention is not limited to the application, the embodiments and the examples described above.

Thus, the present invention applies to all types of reversible polyphase rotating electrical machines, such as alternator-starters, driven for example by belt or integrated, and in particular for hybrid applications.

Thus, in a non-limiting embodiment, the electronic assembly 10 may comprise as many power modules as necessary (two phases per module at most) to achieve a machine with three, five, six or seven phases.

Thus, in another non-limiting embodiment, the power module 200 may comprise a ceramic comprising the control components (driver) of the electronic switches and the signal components. The electronic switches are transferred to the conductive support by soldering and wire bonding. In this case, the power module further comprises a contour of plastic material which allows the mechanical strength of all the elements of the power module between them. In non-limiting embodiments, the plastic material of the contour is PEEK (polyetheretherketone) or PPA (polyphthalamide). These plastics are high-performance high performance plastics that can be used at high temperatures, for example around 350 ° C, which is interesting when soldering the electronic switches on the conductive support.

Thus, with this embodiment, a single casing is used, namely the overmolded casing piece 100, in which the casing modules are mounted. power without electrical and laser welds, mounting on the heatsink of the electrical machine being performed via mechanical mounting means common to all modules. Thus, in another non-limiting embodiment, a so-called "copper in lay" technology can be used for the power modules 200.

Thus, the invention described has the following advantages in particular: it makes it possible to easily dismount:

- A power module that does not work without risk of damaging the electronic assembly or the rotating electrical machine;

- Overmolded housing part and ground plate without risking damage to the rotating electrical machine;

- it avoids scrapping the electric machine

complete since it eliminates the electric and laser welds during the integration of the overmolded part-housing including the power modules to the electric machine;

it reduces the volume occupied by the electronic assembly on the electric machine:

replacing the mounting means of each power module which existed in the state of the prior art by means of assembly common to all the power modules and present on the over-molded case-piece;

- by removing a piece of power of the state of the prior art, namely the inter-power connector;

- by replacing the plastic electronic boxes of each power module by a single plastic electronic box, namely the overmolded piece-case;

it reduces the total cost of the electronic assembly: - by using an inexpensive plastic for the overmolded part-case;

by eliminating the electric and laser welds specific to each power module that existed in the state of the prior art;

- using a PCB for the power modules; it makes it possible to choose the position of the phase outputs of the stator by over-molding of the phase traces in the overmolded part-case. This eliminates the constraints of the given position of the phase outputs;

it makes it easy to adapt the electronic assembly for a three-phase machine, hexaphase or other.

Claims

1. Overmolded case-piece (1 00) made of plastic material of an electronic assembly (1 0) for a rotary electric machine for a motor vehicle according to which said overmolded case-piece (1 00) is adapted to be mounted on a plate of lower mass ( 300), and wherein said overmolded housing member (100) comprises: a plurality of housings (101) adapted to each receive a power module (200), a power module (200) comprising a conductive support (201 0); );

a power conducting part (1 02) overmolded in said overmolded case-piece (1 00), said power conducting part (1 02) being adapted to be connected to at least one connector (201 1) of the conductive support (2010) each power module (200);

a plurality of phase traces (1 03a, 1 03b) overmolded in said overmolded case-piece (1 00), said phase traces being adapted to be connected to phase connectors (201 2a, 201 2b) of the conductive support ( 201 0) of each power module (200);

mounting ports (104 ', 104a, 104b) adapted to receive mounting means (14) for mounting each power module (200) to said overmolded package member (100).

An overmoulded case (100) according to claim 1, wherein the plastic material of the overmolded case (100) is PPS or PBT.

An over-molded case (1 00) according to claim 1 or claim 2, wherein the power conducting part (102) has a plurality of power connection tabs (102 ') disposed parallel to the plane of the overmolded case member (100), a power connection tab (102') being adapted to cooperate with a power module (200).

An overmoulded housing (100) according to any one of the preceding claims 1 to 3, wherein the phase traces (103a, 103b) each comprise a first phase connection tab (103a ', 103b') adapted to connecting a power module (200), a first phase connection tab (103a ', 103b') being positioned parallel to the plane of the overmolded case member (100).

An overmoulded housing (100) according to any one of the preceding claims 1 to 4, wherein the phase traces (103a, 103b) each comprise a second phase connection tab (103a ", 103b") adapted to connecting a phase of the stator, a first tongue (103a ", 103b") being positioned vertically with respect to the plane of the overmolded case-piece (100).

An overmoulded housing (100) according to any one of the preceding claims 1 to 5, wherein the overmolded housing member (100) has first and second mounting holes (105-106), said mounting holes ( 105-106) being adapted to mount said electronic assembly (10) on a dissipator (1 1) of the rotating electrical machine.

An electronic assembly (10) for a rotating electrical machine, wherein said electronic assembly (10) comprises: an overmolded case-piece (100) according to any one of the preceding claims 1 to 6;

a plurality of power modules (200) comprising:

a conductive support (2010) on which are mounted: a plurality of electronic power switches (2020);

signal components (2030);

said conductive support (2010) comprising:

a power connector (201 1);

at least two phase connectors (2012a, 2012b).

8. Rotating electrical machine comprising:

- a rotor;

a stator coupled to said rotor and comprising a plurality of phases;

- An electronic assembly (10) according to the preceding claim 7, said molded case-piece (100) of plastic material of said electronic assembly (10) being adapted to be connected to the phases of said stator;

a rear bearing supporting said stator; and

- a dissipator (1 1) of the rear bearing adapted to receive the lower ground plate (300) of said electronic assembly (10).

9. rotating electrical machine according to claim 8, wherein said rotating electrical machine is an alternator-starter.