FR3020728A1 - OVERMOLDED COMPONENT PIECE OF AN ELECTRONIC ASSEMBLY FOR A ROTARY ELECTRIC MACHINE FOR A MOTOR VEHICLE - Google Patents

Abstract

The present invention relates to an over-molded case-piece (100) made of plastic material of an electronic assembly (10) for a rotating electrical machine, adapted to be mounted on a lower ground plate (300) and having housings (101) for receiving power modules (200), a power module comprising a conductive support (2010), a power conducting part (102) overmolded in the housing 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) overmolded in the housing part, the phase traces being adapted to be connected to phase connectors (2012a, 2012b) of the conductive support of each module power supply, mounting holes (104 ', 104a, 104b) receiving means (114) for mounting the power modules on the housing part.

Description

The present invention relates to an over-molded piece-piece made of plastic material of an electronic assembly for a rotating electric machine for a motor vehicle. BACKGROUND OF THE INVENTION 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.

BACKGROUND OF THE INVENTION In a motor vehicle comprising a heat engine and a rotating electrical machine such as an alternator-starter, such a machine comprises in a nonlimiting manner: a rotor comprising an inductor into which a current is supplied. excitement; 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 molded conductive traces IML type (IML for "Isolated Molded Leadframe" in English) contained in a high-end plastic housing capable of withstanding high temperatures. A plurality of electronic switches, conventionally MOSFETs, are welded at high temperature to the conductive trace circuit, the electronic switches of a module being intended to produce 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) intended to carry 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 30.

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 overcome the above-mentioned disadvantage. GENERAL DESCRIPTION OF THE INVENTION To this end, the invention proposes a molded plastic body 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 over-molded housing 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 overmolded part-case, 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 on the molded housing part.

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-out piece made of plastics material may furthermore include one or more additional characteristics among the following: the plastic material of the overmolded piece-piece 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.

There is also provided 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. There is also provided 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 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 rear bearing dissipator 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 on reading the description which follows and on 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 housing part 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; FIG. 9 represents a perspective view of the electronic assembly of FIG. 8 assembled on the dissipator 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 The 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 rotary electrical machine is in this type of application 20 used for the electrical generation and start of the engine (with the functionality called "Stop & Go" or "Stop / Start" in English). As illustrated in Figure 1, according to a non-limiting embodiment, the electronic assembly 10 comprises: - an over-molded case-piece 100 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 30 to be mounted on a dissipator 11 of the rotating electrical machine and 10 ^ ^ intended to be connected to the potential terminal negative of the vehicle battery. The different elements of the electronic assembly 10 are described in more detail below. Overmolded Part-Case The overmolded case-piece 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 (Polyphthalamides). 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 part-housing molded. The overmolded case-piece 100 comprises: a plurality of housings 101; A plurality of power conductive traces including 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 nonlimiting illustrated example, there are three housings 101 making it possible to mount three power modules 200 in the room. The power conductive 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 such that illustrated in the sectional figures 3 and 4. It comprises a plurality of overmolded external power connection tongues 102 ', a power connection tab 102' 10 being associated with a power module 200. Thus, a connection tab of FIG. power 102 'opens into each housing 101 and is adapted to cooperate with a power connector (described below) of a power module 200. The tabs 102' are posit parallel to the (horizontal) plane of the overmolded case-piece 15 100; 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 overmoulded in said overmolded case-piece 100. Two phase traces 103a, 103b are associated with a power module 200. They allow each power module 200 to be connected 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 traces of phases 103a, 103b provides the 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 molded phase connection tab 103a ', 103b' adapted to connect a power module 200. Two first phase connection tabs 103a ', 103b' are adapted to cooperating with phase connectors (described later) of a power module 200. As illustrated in Figure 2 or 4, the first tongues 103a ', 103b' are positioned parallel to the plane of the molded housing part 100 ; this makes it possible to reduce the vertical bulk of the electronic assembly 10. - a second molded phase connection tab 103a ", 103b" adapted to connect a phase of the stator. Two first phase connection tabs 103a ", 103b" are adapted to cooperate with phases of the stator. As illustrated in FIG. 3, the first tabs 103a ", 103b" are positioned vertically with respect to the (horizontal) plane of the overmolded casing member 100; this allows easy access to said tabs for connection with the phases of the stator. The mounting holes 104 ', 104a and 104b shown in Figures 2 and 4, are adapted to receive mounting means 114 for mounting each power module 200 to said overmoulded case member 100. Still in this particular embodiment of the invention, a machine having six phases, each housing 101 has three mounting holes 104 ', 104a and 104b, an orifice 104' being integrated in the power tab 102 'and an orifice 104a and 104b being respectively integrated in each phase tongue 103a ', 103b'. As illustrated in FIG. 4, the overmolded casing part 100 further comprises: first mounting orifices 105 adapted to mount the overmolded casing part 100 on a dissipator 11 of the rear bearing of the rotating electrical machine. These two orifices 105 are placed on the inner circumference of said overmolded case-piece 100; and second mounting orifices 106 adapted to mount the over-molded casing member 100 on the dissipator 11 of the rear bearing of the rotating electrical machine. These two orifices 106 are placed on the outer circumference of said overmolded casing member 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 B + trace, a phase trace and a ground trace; a plurality of electronic power switches 2020 mounted on visible power traces; and a control circuit integrating 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 hereinafter) to two phases of the stator via two phase traces 103a and 103b of the over-molded case-piece 100. As illustrated in FIG. 6 , the conductive support 2010 comprises: a power connector 2011 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 power connectors 2011 and phase 2012a, 2012b include respective mounting holes 2014 ', 2014a, 2014b corresponding to the mounting holes 104', 104a, 104b of the overmolded case-piece 100, namely, the orifices 2014 ', 2014a, 2014b are adapted to be positioned respectively vis-à-vis the 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 114, which are in a non-limiting example of the fixing screws. It will be noted that the fixing screws 114 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 2011 and 2012a and 2012b respectively an electrical connection between the modules of power 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 2011 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 be easily assembled and removed from the molded case-piece 100 via the fixing screws 114 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 mass plate 300 supports the overmolded casing part 100. The plate is in a non-limiting embodiment of aluminum and has an electrically insulating part (anodization for example) in order to ensure a good isolation with the potential lead B + and phase conductive traces and a conductive part for making the power modules' ground connection via a wire bonding connection with the electronic power switches (MOSFETs) .

As illustrated in FIG. 7, the plate 300 comprises: third mounting orifices 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 holes 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 heatsink 11 of the rear bearing of the rotating electrical machine. Thus, all the mounting holes 105-106 and 305-306 are adapted to mount the electronic assembly 10 on the dissipator 11. As shown in Figure 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 FIGS. 2 or 4, the power conducting piece 102 is connected to the electrical terminal 107. The conductive piece 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 2011 seen previously being connected to the part 102 via the tabs 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 11 of the electric machine. The lower ground plate 300 is thus connected directly to the vehicle ground since mounted on the dissipator 11 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 various 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 overmolded casing member 100 by the three fixing screws 114. inserted in orifices 2014 ', 2014a, 2014b and 104', 104a, 104b; the overmolded casing member 100 is mounted on the bottom mass plate 300; - The 100-weight plate molded housing-unit assembly 300 is mounted on the dissipator 11 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 mounting the molded case-casing assembly 100-plate of mass 300 on the dissipator.

Figure 8 shows an exploded assembly of the electronic assembly 10 on the dissipator 11 of the rear bearing of the rotating electrical machine. The dissipator 11 has first mounting orifices 115 which are opposite the third orifices 305 and first orifices 105 respectively of the lower ground plate 300 and the overmolded housing part 100, and second mounting orifices 116 which are found vis-à-vis the fourth orifices 306 and 1e deuxièmes 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 11 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 can be made in which the control module is for example disposed above the casing-molded part on a plane parallel to said overmolded casing-piece. Thus, the electronic assembly 10 described makes it possible to operate the alternator 25 starter. The latter comprises: 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 features, the overmolded casing member 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 rests the electronic assembly 10. Of course the description of the invention is not limited to the application, embodiments and 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 power modules are mounted without electrical and laser welds, the mounting on the dissipator of the electric machine being carried out via mechanical mounting means common to all modules.

Thus, in another non-limiting embodiment, it is possible to use a so-called "copper in lay" technology for the power modules 200. Thus, the invention described has the following advantages in particular: it makes it possible to easily dismount: a module power that does not operate without the 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 complete electrical machine since the electrical and laser welds are dispensed with during the integration of the over-molded case-piece comprising the power modules to the electrical machine; it reduces the volume occupied by the electronic assembly on the electrical machine by replacing the mounting means of each power module that existed in the state of the prior art by means of assembly common to all the power modules and present on the 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; removing electrical and laser welds specific to each power module that existed in the state of the prior art; using a PCB for power modules; it makes it possible to choose the position of the phase outputs of the stator by over-molding the phase traces in the over-molded case-piece. This eliminates the constraints of the given position of the phase outputs; it makes it possible to easily adapt the electronic assembly for a three-phase, hexaphase or other machine.

Claims (9)

REVENDICATIONS1. Overmolded case-piece (100) made of plastic material of an electronic assembly (10) for a rotary electric machine for a motor vehicle according to which said overmolded case-piece (100) is adapted to be mounted on a lower ground plate (300), and wherein said overmoulded housing member (100) includes: a plurality of housings (101) adapted to each receive a power module (200), a power module (200) comprising a conductive support (2010); a power conductive member (102) overmolded in said overmolded body member (100), said power conductive member (102) being adapted to be connected to at least one connector (2011) of the conductive medium (2010) of each power (200); a plurality of phase traces (103a, 103b) overmolded in said overmolded case-piece (100), said phase traces being adapted to be connected to phase connectors (2012a, 2012b) of the conductive support (2010) of each power module (200); - mounting holes (104 ', 104a, 104b) adapted to receive mounting means (114) 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 member (100) is PPS or PBT. An overmoulded casing (100) according to claim 1 or claim 2, wherein the power conductive member (102) has a plurality of power connection tabs (102 ') disposed parallel to the plane of the workpiece. overmolded housing (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 (11) of the rotating electrical machine. An electronic assembly (10) for a rotating electrical machine, wherein said electronic assembly (10) comprises: - an overmoulded case (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 (2011); - 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 (11) of the rear bearing adapted to receive the lower ground plate (300) of said electronic assembly (10). 9. rotary electric machine according to claim 8, wherein said rotating electrical machine is an alternator-starter.