WO2011070281A1

WO2011070281A1 - Current rectifying arrangement for a rotary electric machine, comprising at least two modules, and rotary electric machine comprising such an arrangement

Info

Publication number: WO2011070281A1
Application number: PCT/FR2010/052623
Authority: WO
Inventors: Benjamin Loret; Michel Fakes; Fabrice Tauvron; Mathieu Bonnici; Aurélien Petrez
Original assignee: Valeo Equipements Electriques Moteur
Priority date: 2009-12-11
Filing date: 2010-12-07
Publication date: 2011-06-16
Also published as: FR2954017B1; FR2954017A1

Abstract

The disclosed current rectifying arrangement (100A) comprises a bearing that is part of a multiphase rotary electric machine and electrically insulates at least two modules, each of which has a part (16-10') that includes a piece (10') for supporting current rectifying elements (93, 94) and a heat dissipator (16), the outer periphery of which is provided with a base (19) rigidly connected to the first piece. On at least one of the circumferential ends of its base (19), each module (100A) has a mounting zone in the form of a projection (701, 702) for connection to the other module. Said projections are designed to be placed on top of each other and are bored (590) so as to allow a fixing member to penetrate therethrough in order to mount the modules on the bearing, electric insulation means (592, 593) being placed between the two projections (701, 702). Said means comprise a sleeve (592) which penetrates the aligned bores (590) of the projections (701, 702) and is provided with a collar (593) that is to be inserted between the ends of the two projections (701, 702). The multiphase rotary electric machine is characterized in that it holds such an arrangement. Application: motor vehicle alternator.

Description

"Current rectifying arrangement with at least two modules for a rotating electrical machine and a rotating electrical machine having such an arrangement"

Field of the invention

The present invention relates to a current rectifying arrangement comprising a current rectifying device and a bearing belonging to a polyphase rotating electrical machine, in particular an internally ventilated motor vehicle alternator, said bearing electrically insulating the current rectifying device. comprising at least two modules each comprising a part provided with at least one fixing zone for fixing it on the bearing of the electrical machine and provided, on the one hand, with a first electrically conductive support portion for elements of rectifying current, such as diodes, of a phase of the electric machine, and secondly, a second part forming a heat sink with a base integral with the first party.

The present invention also relates to a polyphase rotating electrical machine comprising such an arrangement.

State of the art

Such an arrangement and such a polyphase rotating electrical machine, in the form of a multiphase alternator with internal ventilation for a motor vehicle, are described in document FR 2 911 444. This machine comprises, for example as in EP 515 259 and FR 2 602 925, a casing carrying a stator surrounding a rotor integral with a rotor shaft rotatably mounted in the housing.

The housing comprises at least two perforated flanges, called front bearing and rear bearing, ring-shaped and hollow, each bearing a central ball bearing for rotational mounting of the shaft.

At least one excitation coil is associated with the rotor. This winding is for example connected by wire links to slip rings integral with the rear end of the rotor shaft. Brushes, carried by a brush holder integral with a voltage regulator, are allowed to rub on the rings.

The stator has a groove body carrying a stator winding through the grooves and extending on either side of the body to form buns.

The winding comprises one or more windings per phase. These windings are obtained for example from a continuous coiled wire covered with enamel or from enamel-coated conductive segments, such as pins connected together by welding.

The windings are connected in star or delta and have phase outputs connected to inputs belonging to a current rectifier, on the one hand, carried by one of the front and rear bearings and, on the other hand, having current rectifying elements, such as diodes, belonging to at least one AC rectifying bridge in DC current. This device is capped by a perforated protective cover secured to the bearing.

The number of phases depends on the applications. It is equal to or greater than three as described in WO 03/009452, with the presence of one or two bridge rectifiers.

Referring to FIGS. 1 and 2, which correspond to FIGS. 3 and 6 of document FR 2 911 444, it can be seen that the rear bearing 50, of annular and hollow shape, comprises a bottom 56, generally of transverse orientation with respect to the axis XX of the shaft 61 of the rotor 58, here with claws, carrying a rear fan 57 provided with blades 570. The bottom 56 has air inlet openings 51 and is extended at its outer periphery by a rim 55 annular globally axial orientation relative to the axis XX. The flange 55 has openings 53 for air outlet and internally houses the body 155 of the stator carrying a bun 156 implanted radially between the blades 570 and the openings 53, which comprise an axial portion affecting the rim 55 and a radial portion affecting the outer periphery of the bottom 56.

The bun 156 belongs to the stator winding and carries the outputs of the windings of the phases, which each pass through a radial portion of an opening 53 or alternatively a specific opening made at the outer periphery of the bottom 56 as in EP 515 259.

The reference 52 designates a central cylindrical core internally defining the central opening of the bottom 56 and externally the openings 51 of air inlet. A capsule 62 is interposed between the core and the outer periphery of the outer ring of the bearing 60. When the excitation coil of the rotor is electrically powered and the shaft 61 rotates, the rotor is magnetized and an induced alternating current is generated in the stator winding.

This reciprocating AC current is rectified into a DC current by the current rectifier device, in particular to recharge the vehicle battery and supply the consumers of the on-board vehicle network with direct current.

An air circulation between the openings 51 and

53 is achieved by the rotation of the fan 57 to cool the rectifier and the stator winding and ball bearings. The current rectifier device - bearing is a current rectifying arrangement, which comprises:

- A 50 openwork bearing, here back, belonging to the housing of the polyphase alternator with internal ventilation comprising a plurality of phases each having an output;

an AC direct current rectification device carried by the bearing 50 and comprising at least two modules 100 each comprising an electrically conductive plate 10, on the one hand, designed to be electrically connected to the output of the phase in question, and on the other hand, carrying a pair of diodes 93, 94.

The bearing 50 of the alternator housing is metallic, here aluminum or alternatively based on magnesium. he is electrically connected to the ground and to the negative terminal of the battery.

Its bottom 56 electrically insulated the modules 100, via an electrically insulating piece 40, which is interposed between the modules 100 and the bottom 56 of the bearing 50 and which has openings of substantially the same shape as the openings 51 associated with the modules. The plate 10 is extended by a heat sink 16 integral with the plate 10, here with the aid of screws 92. This dissipator 16 has a base 19, extended inwards by the fins 18. A heat conducting element 17 is interposed between the dorsal face 102 of the plate 10 and the front face of the base 19.

The air passes through the fins 18 located vis-à-vis an opening 51 and it is for this reason that the fins are of different length to fit the shape of the openings 51. The module is well cooled .

The diodes 93, 94, grouped in pairs, project outwardly with respect to the front face 103 of the plate 10. They are provided with a base, comprising a solid main part extended axially by a base having a fixing face for a semiconductor element 200 interposed between the base and the head of a rigid wire-shaped connection element called the tail or axis of the diode. Resin surrounds the head of the tail of the diode and the semiconductor element. This resin is integral with the base. The tail 97 of the diode 94 is intended to be electrically connected to the ground via the metal bearing 50, whereas the tail 96 of the diode 93 is intended to be electrically connected to a terminal connected by a cable to the positive terminal of the drums. For more details, refer in particular to the wiring diagram of FIG. 8 of document FR 2 911 444, given that in this embodiment there are six modules (see FIG. 2 of this document).

Each plate 10 has at least one protuberance 15 for attachment with a fastener 91 to the bottom 56. In FIGS. 1 and 2, there is provided a single protuberance per module in the form of a tab 15 perforation extending perpendicularly to the plate 10. The fastener, in the form of a screw 15, passes through the lug 15 via an insulating barrel 199 to screw into a hole 150 of the bottom 56, connected to the ground, while the plate 10 is connected to the output of the phase concerned through to do the bottom 56.

With two mounting protrusions per module is obtained a more reliable fixation and a longer life because this dual attachment is particularly less sensitive to vibration phenomena.

Thus in document FR 2 919 770 two fixing points are used per module as can be seen in FIGS. 9 and 10 of this document. To do this the base of a module has two fixing holes for the each passage of a fastener of the module to the bearing with the intervention of an electrical insulation sleeve. A problem arises when increasing the number of fixing protuberances. Indeed for at least two modules to be fixed on the bearing of the electrical machine, it is necessary to increase the number of fasteners 91. In a solution of the type described in document FR 2 827 436, which does not appeal at modules, two adjacent heat sinks have at one of their circumferential ends a protrusion of connection with the other heat sink, said protuberances being configured to be superimposed and pierced for the passage of a fastener of the two dissipators at the bearing with intervention of an electrical insulation sleeve.

In this document the heatsinks carry positive diodes and the negative diodes are carried by the bearing so that the heatsinks do not belong to a module.

Object of the invention

The object of the present invention is, in the context of a solution with current rectification modules, to increase the number of fixing points of the module, without appreciably increasing the number of fasteners. According to the invention, a current rectifying arrangement comprising a current rectifying device and a perforated bearing belonging to a polyphase rotating electrical machine, in particular a motor vehicle alternator, said bearing carrying electrically insulating the current rectifying device comprising at least two modules each comprising a part provided with at least one attachment zone for fixing it on the bearing of the electrical machine and having, on the one hand, a first electrically conductive support part for current rectifying elements, such as diodes, a phase of the rotating electrical machine, and secondly, a second part forming a heat sink provided at its outer periphery with a base integral with the first part, is characterized in that that each module has at at least one of its circumferential ends of its base a fixing zone under the an interface protrusion with the other module, in that the connecting protuberances of two adjacent modules are, on the one hand, configured to be superposed and, on the other hand, are pierced for the passage of an organ fixing the modules to the bearing, in that electrical insulation means intervene between the two protuberances and comprise a sleeve penetrating into the aligned bores of the superimposed protuberances and in that the sleeve has a flange intended to be inserted between the ends of the two superimposed protuberances of two adjacent modules. According to one characteristic, the electrical insulation means are also means of thermal insulation. These means are in a plastic embodiment.

According to one characteristic, the flange is extended by two overlapping covers and circumferentially offset by 180 ° relative to one another.

Each cover is dedicated to a protrusion and partially masks the outer periphery of a protuberance.

The modules are thus thermally insulated relative to each other.

It is thus formed a chain of more stable modules with altogether an additional fixing member for fixing this chain to the bearing. Fixing these modules is more reliable and safe by being less sensitive to vibration phenomena. For a current rectifying device comprising six modules, seven fasteners are sufficient.

These modules are well electrically isolated from each other.

According to one characteristic, the sum of the stack heights is generally less than the thickness of the dissipator.

According to another characteristic, the height of a protuberance is less than or equal to half the thickness of the dissipator. This reduces the axial size.

In one embodiment, the protuberances consist of chimneys. The two chimneys of two adjacent modules are configured to be stacked one above the other, that is to say superimposed.

The chimneys constitute the fixing zones provided with a bore in the form of a central passage. According to a characteristic, each base of a module has a protuberance at each of its circumferential ends. The two protuberances are offset with respect to each other. Thus one of the protuberances is closer to the dorsal surface of the dissipator than the other protuberance closer to the front face of the dissipator.

The modules implanted at one of the circumferential ends of the current rectifying device may be different from the other modules and have a single protrusion, adjacent to the protuberance of the neighboring module, and another fixing point, such as the tab of the FIG. 2 or an enlarged area formed in the base.

The module may comprise a plate like the module of FIG.

As a variant, the first part of the part consists of a sole with a thickness less than the thickness of the dissipator. According to a characteristic, the first part of the part of a module consists of a sole protruding outwards with respect to the second part and the sole, seen in the axial direction, is of thickness less than the thickness of the second heat sink portion so that the end face of the second portion is axially offset from the end face of the first portion.

According to another characteristic, the heat sink and the soleplate of the part are made of electrically and thermally conductive material.

The heat sink and the soleplate are metallic. They are for example aluminum or copper.

A rotating electrical machine of the type indicated above is characterized in that it carries such a rectifying current arrangement.

In the case of an embodiment with a base that is less thick than the dissipator, the current rectifying elements, such as diodes, extend perpendicularly to the baseplate.

We take advantage of the difference in thickness between the soleplate and the dissipator to implement with this difference in thickness the tails of the diodes so that the solution is compact radially and axially. According to one characteristic, it is advantageous to use this difference in thickness to also implant a connection connector to the tails of the diodes opposite the front face of the soleplate.

This connector comprises, in one embodiment, two parallel traces each having connecting arms to the tails of the diodes.

All of these features make the connector compact while having a desired length dissipator. The solution with two parallel traces is simpler, less cumbersome and more economical than that of document FR 2 910 770 involving a chain of connection pieces with holes for diode passage, having protruding flanges and fixed to one another. by welding.

According to a characteristic, the modules are mounted in a partitioned housing made of electrically insulating material and also advantageously thermally insulating.

The housing comprises a perforated bottom adjacent the perforated bearing and partitions perpendicular to the bottom for forming module mounting housings.

Each partition is in two parts to create a passage space protuberances electrically insulated relative to each other.

This makes it possible to thermally isolate the modules from each other and thus to standardize the temperatures of the modules. All its characteristics, which provide other advantages, are to be considered individually or in combination.

Other advantages will become apparent from the following description and with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial view in axial section in axial section of a polyphase rotating electrical machine according to the application FR 2 911 444;

FIG. 2 is a perspective view of a dc AC rectifying module mounted on the bottom of the bearing of FIG. 1;

FIG. 3 is a perspective and exploded view of the components of the DC rectifier rectification rectifier arrangement according to the invention;

- Figure 4 is an enlarged perspective view of the connector to the terminal and the bearing of Figure 3;

Figure 5 is an enlarged perspective view of the housings of DC AC rectifier modules of Figure 3;

FIG. 6 is a perspective view of the two diodes of a current rectifying module of FIG. 3;

FIG. 7 is a perspective view of one of the current rectifying modules of FIG. 3;

FIG. 8 is a view similar to FIG. 7 showing the current rectification module at another angle, also showing in perspective the electrical insulation sleeve intended to penetrate. in the hole in the enlarged area of the heat sink base of the current rectifier module;

Fig. 9 is a perspective view, without the connector body, of the DC AC rectifier device belonging to the rectifier arrangement of Fig. 3;

FIG. 10 is a view showing the current rectifying arrangement of FIG. 3 when assembled on the bearing concerned;

- Figure 11 is a perspective view similar to Figure 10 with the assembly of the voltage regulator assembly - brush holder;

FIGS. 12 to 14 are views similar to FIGS. 7 to 9 for a second embodiment of

The invention;

FIG. 15 is a sectional view showing, during assembly, the adjacent connecting and fixing chimneys of two consecutive modules.

Description of Embodiments of the Invention

In the figures, the identical elements will be assigned the same reference signs and the radial, axial and transverse orientations will be made with reference to the axis XX of FIG. 1. The term dorsal designates the face of a part directed towards the bottom 56 of the bearing 50 and the frontal term the face of a part directed in opposite direction to the bottom 56.

FIGS. 3 to 15 show two exemplary embodiments of a direct current rectifying arrangement of direct current, which has several current rectifying modules 100A, each of which is dedicated to the rectification of a current of a phase of the polyphase rotating electrical machine and which replace the modules 100 of FIG.

As can be seen in particular in FIGS. 3, 8 and 13, the current rectifying arrangement comprises the bearing, here rear 50 with a perforated transverse base 56, belonging to the casing of the rotating electrical machine in the form of an alternator with internal ventilation. as in Figures 1 and 2.

This bearing 50 carries a housing 27 of electrically insulating material, here made of plastic, on the one hand, provided with partitioned housing and on the other hand, with a perforated bottom 21 facing the air inlet openings. 51 of the bearing 50 and adjacent to the bottom 56 of the bearing 50.

This housing 27 serves to accommodate several modules 100A belonging to the AC direct current rectifier device belonging to the rectifier arrangement.

These modules 100A are mounted in the partitioned housing of the housing 27 and electrically isolated from the bearing 50 via the bottom 21 of the housing;

There is also provided an external peripheral connector 26 configured to be connected to a terminal, called terminal B +, and to the bearing 50.

Fixing the current rectifying device on the bearing 50, electrically insulated via the bottom 21 of the housing 27, is carried out using, on the one hand, fastening members 192 of the connector 26, modules 100A and from the housing 27 to the bearing 50 and secondly with sleeves 492 of electrically insulating material to be traversed by the members 192 and to be threaded into the modules 100A. Elastic washers, such as Belleville washers (not referenced), are in contact with the dorsal face of the fasteners. The modules 100A, the connector 26 and the housing 27 therefore belong to the AC direct current rectification device which is secured to the perforated bearing 50 for forming the current rectifying arrangement.

In one embodiment these sleeves 492 are adjusted in length to pass through the base 19 of the module concerned and engage with the bottom 21 of the housing 27 and with the connector 26 for forming a housing subassembly 27-modules 100A- connector 26 before fixing this subassembly on the bearing 50 by means of fasteners 192.

The structure of the stator and rotor of the alternator is retained, its rear bearing being provided with additional holes as described below.

According to a characteristic, the housing 27 is configured to receive the modules 100A of FIGS. 3 to 11 with a single fixing zone on the bearing and also the modules of FIGS. 12 to 15 with two fixing zones on the bearing.

Each module 100A (FIGS. 7, 8, 12, 13, 15) comprises a pair of ac current rectifying elements here in the form of diodes 93, 94 each having a tail 96, 97, as in FIG. FIGS. 1 and 2, and according to a characteristic, a part 16-10 'comprising several parts, namely: a first part 16 configured to form a heat sink 16 provided in FIG. 3 with fins 18 for cooling and at its outer periphery with a base 19;

- A second portion 10 'shaped sole configured to form a mounting bracket diodes 93, 94 respectively positive and negative.

According to one characteristic, the base 19 comprises at least one fixing zone for fixing it on the bearing 50, this zone is pierced as described below.

According to another characteristic, the dissipator 16 and the soleplate 10 'are made of electrically and thermally conductive material.

In one embodiment the dissipator 16 and the sole 10 'are metallic.

In the embodiments of Figures 3 to 15, the dissipator 16 and the sole 10 'are metal based on aluminum, which is a good conductor of heat, just like copper.

The 16-10 'aluminum-based part is made in this embodiment by molding which allows to easily obtain the desired shapes.

In a variant, the single piece 16-10 'is obtained by molding while being based on magnesium.

In a variant, the piece 16-10 'is based on copper. In this case the part 16-10 'is obtained by machining.

In this embodiment the piece 16-10 'is monobloc.

According to a characteristic, the part 16-10 'is, seen in the axial direction, stepped in thickness and is circumferentially narrower at its inner periphery. In FIGS. 7 to 15, according to one characteristic, the thickness of the sole, seen in the axial direction, is less than the thickness of the dissipator 16, viewed in the axial direction, so that the front face of the dissipator 16 is offset axially relative to the front face of the sole 10 '.

The sole 10 'protrudes outwards with respect to the internal dissipator 16. This sole 10' extends in the radial extension of the dissipator and in parallel with the bottom 56 of transverse orientation of the rear bearing 50.

The inner periphery of the outer flange 10 'of the part 16-10' is connected to the base 19 of the outer peripheral 16 of the dissipator 16 of the room 16-10 '.

The outer periphery of the flange 10 'has an electrically conductive protrusion 110 configured to be connected to the output of a phase of the alternator, this output passing through an air outlet opening 53.

The protuberances 110 are located opposite the radial portions of the air outlets 53.

In FIGS. 3 to 15, the protuberance 110 consists of a generally parallelepipedal projection provided with a tapped hole 15 'for fastening, with the aid of a screw, a perforated tongue constituting the end of an exit of phase of the alternator.

Alternatively, when the piece 16-10 'is made of copper, the output of the phase is welded directly to the protrusion 110 or alternatively to the edge of the sole between the two diodes 93, 94, so that the presence of the protrusion 110 is not imperative. In a variant, the protuberance 110 is slotted to receive force-fitting from the end of the exit of the phase. The sole 10 ', integral with the dissipator 16, is the support of the pair of diodes 93, 94 each having a cylindrical base and a shank 96, 97 implanted inside the openings 53. The sole 10' electrically conductive 10 is a diode carrier. This sole 10 'has in Figs 3 to 15 a constant thickness, which is a function of the axial height of the base of the diodes.

The diodes are, in one embodiment, fixed by soldering or any other means on the front face of the soleplate 10, especially when the latter is made of copper.

In Figures 3 to 15, economically, the sole 10 'has two holes 119, namely a cylindrical hole 119 for each diode. The cylindrical pellets of the diodes 93, 94 are each provided with a knurled portion 98 (FIG. 6) for press fitting of the pellets of the diodes into the holes 119. The heat dissipation is thus achieved by conduction in the sole 10 '. in engagement with the knurled portions 98. This heat is then transmitted by conduction to the heatsink 16 thicker. Then the heat is removed by convection in favor of the fins 18.

In these embodiments the thickness of the sole 10 'is greater than the height of the knurled portion 98 to engage therewith. Penetration penetration diodes in the holes reduces the size of the module 100A.

The sole 10 'thus carries the diodes with good geometric precision; the knurled pellets 98 being by their knurling in engagement with the edges of the mounting holes 119 of the diodes.

These diodes are called diodes of the type "press fit". Thanks to these arrangements the diodes 93, 94 are well cooled by the dissipators 16.

The holes 119 each belong to a portion 219 of the sole 10 '. The holes 119 are here cylindrical as the caps of the diodes. In a variant, the caps of the diodes and the holes 119 have another shape, for example polygonal. The holes 119 have in all cases a shape complementary to that of the caps of the diodes.

The protuberance 110 extends between the two portions 219. The portions 219 are generally in the form of ears as can be seen more clearly in FIGS. 7 to 14. These lugs 219 are connected to the base 19 of the dissipator 16.

The circumferential width of these two lugs 219 decreases towards the base 19. The contour of a sole 10 'has two internal sections inclined towards the axis of the machine and which are each connected to an outer portion generally circular. Each outer section is connected to one of the circumferential ends of the protuberance 110 for fixing a phase output. The inclined inner sections are therefore of decreasing width in the direction of the base 19 integral with the sole 10 '. This arrangement makes it possible to save material (see FIGS. 9 to 11 and 14) while having a sufficient band of material for fixing the diodes 93, 94. According to one characteristic, the outer periphery of the base 19 is corrugated. (Figures 7 to 14) to create a clearance for the passage of the tool for fitting the caps of the diodes and for welding the tails of the diodes on the connector 26 in the manner described below.

According to another characteristic, the current rectifying elements, here the diodes 93, 94, extend perpendicular to the sole 10 'and therefore perpendicular to the bottom 56 of the rear bearing 50.

The tails 96, 97 of the diodes 93, 94 (FIGS. 7 to 14) are therefore of axial orientation and extend in the same direction generally perpendicular to the fins 18 of radial orientation of the dissipator. In an economical embodiment, diodes of the standard type having tails of identical length are used, so that the free ends of the tails 96, 97 project axially with respect to the front face of the dissipator 16.

In a variant, the tails of the diodes are of different length so that at least one of the two tails 96, 97 is not projecting with respect to the front face of the dissipator 16.

In a variant, the two tails 96, 97 are shorter so that the two tails 96, 97 are not protruding with respect to the front face of the dissipator 16, or are not not protruding from the front face of the housing 27 which minimizes the overall axial size. This is possible due to the difference in thickness between the sole 10 'and the dissipator 16, knowing that the dorsal surface of the sole is in the extension of the dorsal face of the dissipator 16. In the embodiment of FIGS. 6 to 8 , 12 and 13 the diodes 93, 94, of the standard type, have a base of generally 12.7 mm diameter and a height of 8.5 mm overall of their dorsal face at their front end delimited by the cone portion of the diodes traversed by the tail of the diode as best seen in Figures 7 and 12. The length of the tails of the diodes is generally equal to 20.8 mm, the thickness of the material strip between the outer portions and the holes 119 is generally 1.8 mm. The thickness of the sole is generally 9 mm. The length of the knurled portion 98 of the base of the diode is generally equal to 3.1 mm. The thickness of the dissipator is globally equal to 24.5 mm.

In FIG. 6, the knurled portion 18 is located at the base of the base of the diode.

In an advantageous embodiment the knurled portion 98 of the diode is offset from the dorsal face of the diode base for better heat dissipation by conduction in the sole.

In an optimum embodiment, the knurled portion 98 is implanted generally in the middle of the base of the diode. There is thus obtained a better diffusion of heat by conduction between the sole 10 'and the base of the diode. Indeed, the thickness of the soleplate being generally 9 mm, the height of the base generally 8.5 mm and the length of the median knurled portion globally 3.1 mm; it is thus formed at the hole 119 on either side of the knurled portion 98 a strip of material in the sole 10 '. Thus a heat diffusion cone is made in the sole; the heat being evacuated by the strip of material of the sole, said strip of joining material, assembled with the knurled portion 98 and also by the two strips of material arranged on either side of this strip of joining material . A good heat diffusion cone is thus obtained, the three strips of material being generally of the same length.

The thickness of the sole 10 'is therefore in these embodiments greater than the height of the base of the diodes. Of course the diodes, in this example, also have a shorter tail, advantageously generally equal to 16 mm not to exceed relative to the front face of the housing 27 in the plane of the front face of the dissipator 16. Alternatively the face front of the housing is protruding from the front face of the dissipator.

The length of the tails depends on the thickness of the connector 26 described below. The size of the sole 10 'depends on the applications and in particular the diameter and the height of the base of the diode. It follows from the foregoing that the electrical function of the module 100A is achieved using the diodes 93, 94 and the sole 10 ', while the heat dissipation function is carried out mainly by the dissipator 16 arranged for the most part in the air flow and connected to thermal conduction at the sole 10 '.

This dissipator (Figures 7 to 14) has at its outer periphery a base 19 extended internally by thin fins 18 in one piece with the base 19. The dissipator has a generally trapezoidal shape whose large base is formed by the base 19 of corrugated shape at its outer periphery.

The fins 18 are obtained, for example when the part 16-10 'is based on aluminum, by molding. In a variant, the fins 18 are machined.

These fins 18 extend, seen in the axial direction, perpendicular to the sole 10 '. They have decreasing lengths at the circumferential ends of the base 19 to give the dissipator a generally trapezoidal shape adapted to that of the air passage openings 51 of the bearing 50, some of which are visible in FIG. 3. These openings 51 are generally of trapezoidal shape, and are delimited internally by the central core 52, laterally by arms and externally the material of the bottom 56. Axial air passages are present between two consecutive fins 18, which are in correspondence with an opening 51 associated with the module 100A. In an advantageous embodiment, according to one characteristic, some of the fins 18 are extended in the vicinity of their free end by a secondary plunger 180 more cast and directed axially towards the inside of the bearing 50. These fins 180 are configured to penetrate axially to less in part in the relevant opening 51 of the rear bearing 50. The fins 180 extend in axial projection relative to the dorsal surface of the flange 10 'concerned. As shown in Figures 8 and 13 four fins 18, here the central fins, are extended by secondary fins. In the embodiment of Figure 8 there are provided ten fins 18, while in the embodiment of Figure 13 it is expected that eight fins 18, including two wings 597 shorter axially.

The size of the secondary fins 180 is dictated by the shape and size of the openings 51.

In all cases, these fins 180 increase the axial length of the fins 18 and thus allow a better cooling of the pair of diodes 93, 94 of the modules 100A. These fins 180 extend in axial projection with respect to the dorsal surface of the sole 10 '.

The central position of the fins 180 makes it possible to avoid any interference with the fan blades of FIG.

These secondary fins 180 may therefore, in one embodiment, pass through the opening 51 of the air inlet concerned. Alternatively the dissipator 16 is free of secondary fins 180 or has a smaller number of secondary fins.

Alternatively some of the modules 100A are provided with secondary fins 180, while the other modules have no secondary fins.

The modules 100a can therefore differ from each other only by their number of secondary fins.

Thanks to the secondary fins can also make more consistent temperature of the diodes. Indeed, in some applications, one or more diodes may be hotter than the others. In this case the dissipator, associated with these hot diodes, is provided with secondary fins 180, whose number is a function of the temperature reached by these diodes.

In all cases the dorsal surface of the sole 10 'is in the extension of the dorsal face of the base 19. Of course the fins 18 of the modules of Figure 2 are alternatively extended by secondary fins 180 as modules of Figures 8 and 13.

The dissipators 16 are in all cases implanted, via at least their fins 18, into the axial flow of air passing through the openings 51.

When the rotor of the machine rotates, there is creation of a flow of air generated by the rotation of the fan 57 of Figure 1. The air thus axially passes through in all cases the fins 18, alternatively also the secondary fins 180, and the openings 51. The modules are well cooled so that the rotating electrical machine can work at higher temperatures without destroying the diodes. The fins 18, in the embodiment of Figures 3 to 11 have, in the middle of the base, a shorter length at their outer periphery for forming an enlarged central area 190 of the base 19. This area 190 constitutes the zone for fixing the module 100A on the bearing 50. The drilling of this zone 190 consists of a cylindrical hole 490 passing through the dissipator (FIGS. 7 and 8) for the passage of an electrically insulating and also thermally insulating sleeve 492, here in plastic material, traversed by a fastener 192, here a screw alternatively a rivet or bolts, for fixing the module 100A to the bottom 56 of the bearing 50. Each module (Figures 3, 9 to 11 and 14), as above , is intended to be mounted here in the housing 27 of electrically insulating material and preferably thermally insulating, here plastic. The housing 27 has a bottom 21 parallel and adjacent to the bottom 56 of the bearing 50. This bottom 21 is provided with openings 251, generally trapezoidal shape, in correspondence with the openings 51 of the bottom 56 of this bearing. The bottom 21 electrically isolates the parts 16, 10 'and the diodes 93, 94 relative to the bottom 56 of the bearing.

The housing has a plurality of circumferentially distributed partitions. These partitions 30, generally of axial orientation, extend perpendicularly to the bottom 21 and define two consecutive openings 251. The openings 251 are here (FIG. 3) in correspondence with the openings 51. According to one characteristic, the partitions 30 electrically and heat-insulate the heatsinks 16 relative to each other so that the modules 100A have a more homogeneous temperature. More precisely, the temperature of a module is generally independent of the temperature of the adjacent module or modules. The partitions 30 are advantageously axially as high as the fins 18, alternatively higher than the fins, to make the temperature of the modules even more independent and homogeneous.

The length of the tails of the diodes is advantageously adjusted, that is to say calculated, so that these tails do not project relative to the free ends of the partitions 30.

The openings 251 are delimited, like the openings 51, circumferentially by arms. The size of the openings 251 is in this embodiment adapted to the size of the openings 51. The partitions 30 are integrally molded with these arms (not referenced) being narrower than these arms. These partitions 30 are each connected at their inner periphery to an annular wall 129 extending also perpendicularly with respect to the bottom 21. The wall 129 makes it possible to house the brush holder of the assembly 14 regulator voltage-brush holder as visible in FIG. Figure 11. This assembly 14 is implanted between the circumferential ends of the housing 27 extending angularly over more than 180 °. The wall 129 makes it possible to make the temperature of the modules even more independent of each other without the influence of the assembly 14. Partitions 230, generally axially oriented and lower than the partitions 30, are located in the extension of the partitions 30 as shown in FIG.

The partitions 230 are perpendicular to the bottom 21 while being implanted at the outer periphery of the housing 27.

A radial space exists, according to one characteristic, between two partitions 30, 230 in the extension of one another. Holes 521 'are implanted in this space. This space allows the passage of protuberances according to the invention described below.

Each housing is blind and is delimited by two pairs of consecutive partitions 30-230 and internally by the wall 129. This housing is open at its outer periphery and at its front face. The partitions 30-230 and the wall 129 of a housing make it possible to channel the flow of air. A pair of partitions 30, 230 therefore extends in facing relation to the sole plate 10 'and to the dissipator 16 of a module. More precisely by considering the circumferential edge of a module, the face of a partition 230 extends opposite the edge of the sole 10 ', while the partition 30 extends vis-à-vis Screw the slice of the dissipator 16.

The size of these partitions is adapted to that of the slice of the dissipator 16 and the sole 10 'of a module. The pair of partitions 30, 230 constitutes a partition in two parts. The housing 27 thus circumferentially comprises a plurality of partitions in two parts extending perpendicularly to the bottom 21 of the housing 27.

Each housing comprises three holes namely two extreme holes 521 'and a central hole 521 formed in a central lug 352 that has an opening 251 at its outer periphery.

The bottom 56 of the bearing 50 also has holes in correspondence with the holes 521 ', 521. The bottom holes 56 are here threaded for the fastening of the fasteners 192. This is made possible with respect to a conventional alternator because the bearing 50 does not have holes for press fit of the caps of the negative diodes 94.

These arrangements make it possible to standardize the housing 27 and the bearing 50. This makes it possible to mount in the case of the modules 100A of the type of those of the embodiment of FIGS. 7 and 8, or of the modules 100A of the embodiment of FIGS. The holes 521 'are intended for fixing the modules of Figures 12, 13 and 15, while the central holes 521 are intended for fixing the modules of Figures 7 and 8. It is the same tapped holes associated with the bottom 56.

In a variant, at least one housing and at least one module are of different sizes. It depends on the applications. More precisely in one embodiment, some diodes are hotter than the others. At least the module carrying the hottest diodes has a larger size than other modules to make the temperature of the diodes more uniform. One can also play on the presence of one or more secondary fins 180 to make the temperature of the diodes more uniform.

The connector 26 extends to the outer periphery of the housing 27. This connector 26 (FIGS. 10 and 11) covers the partitions 230 and for the most part the flanges 10 '. This connector 26 generally forms a cover for the outer periphery of the housing 27 while extending facing the front face of the flanges 10 'and this thanks to the difference in thickness between the soles and the dissipators 16.

The connector 26 comprises a body 126 of electrically insulating material. This body has at its inner periphery and its outer periphery of the sides to adapt to the shape of the housing housing 27 and the shape of the bases 19 dissipators to reduce the size, including radial. This body 126 is generally polygonal in shape at its inner and outer peripheries. It therefore comprises several polygonal sections, which extend between two side walls 230 of the same housing of a module 100A.

The modules are thus each mounted in a generally trapezoidal housing delimited by the partitions 30-230, the perforated bottom 21 and the connector 26. These housings are closed internally by the wall 129 and open at their outer periphery. The fins 18 of a module are mounted between the two consecutive partitions 30 of the housing. The end faces of the partitions 30 extend here generally in the same plane as the end faces of the dissipators 16 to electrically and thermally isolate the cooling fins. two consecutive modules. The body of the connector 126 extends radially between the bases 19 and the outer periphery of the flanges 10 '. This body extends axially between the front face of the sole 10 'and the front face of the dissipator and this thanks to the difference in thickness between the sole 10' and the dissipator 16. This body 126 is supported on the partitions 230 and mask most of the soles 10 '. The height of the partitions 230 is at least equal to the thickness of the sole 10 'to better thermally isolate the soles relative to each other. Here the protuberances 110 project from the circular outer periphery of the bottom 21. In a variant, the outer periphery of the connector 26 is circular in shape like that of the bottom 21.

The connector 26 comprises (FIGS. 9 and 14) electrically conductive traces 320, 309 embedded in the body 126 made of plastic material and locally visible at their outer periphery so as to form axially projecting arms, respectively 321 and 310, for electrical connection respectively with the tail 96 of the positive diode 93 and the tail 97 of the negative diode 94.

In order to reduce the axial space as much as possible, the height of the arms is calculated so that the connection with the tails of the diodes does not protrude from the free ends of the partitions 30, which define the end faces of the partitions 30.

The conductive traces 320, 309 are generally of rectangular section, the largest side of which is of axial orientation to compact the connector 26 and occupy the space between the front faces of the dissipator 16 and the sole 10 '. The arms 321, 310 are generally of rectangular section and extend in the extension of the traces 320, 309. These traces 320 and 309 are parallel and have several panels connected to each other by rounded areas. Each pan extends circumferentially between two partitions 230 of the same housing of the housing 27.

The arms 321 and 310 are directed axially in the same direction in the opposite direction to the flanges 10 'and the bottom 56, as the tails 96 and 97 of the diodes. The arms 321, 310 are therefore circumferentially offset. These arms each have a fold 350 with a contact tip with the tails of the diodes. Here the tails of the diodes are fixed by welding with the arms 321, 310 at the vertices of the contact plies 350.

In a variant, the fixing of the vertices of the folds 350 with the tails 96, 97 is carried out using an electrically conductive glue or by brazing. In a variant, the attachment is made by crimping.

Each housing is provided with a pair of arms 321, 310. More precisely each panel of a trace 320, 309 comprises an arm respectively 321, 310. It will be noted, according to one characteristic, that the corrugated shape of the base 19 of the piece 16, 10 'of a module makes it possible to house the arms 321, 310. This corrugated shape creates clearances for the arms 321, 310. The corrugation of the base in the embodiment of FIGS. 7 and 12 comprises two concave portions arranged on each side other than a convex top portion implanted between the two parallel tails 96, 97 of the diodes 93, 94.

The peaks of the folds 350 are located near the free ends of the arms. The folds 350 extend in axial projection with respect to the front face of the connector 26. Thus the welding, or generally the fixing by any suitable means, of the tails of the diodes 93, 94 on the arms 321, 310 is easy and fast, all the welds being axially at the same level; the free ends of the arms 321, 309 being located here in the same plane.

The connector 26 also has perforated tabs 127, which have a free end of rounded shape and which each extend between two arms 321, 310 of the same module. These tabs are hollow and are each connected by a rib 128 to the front face of the connector 26. Each rib 128 is located between two arms 321, 310 of the same module. The tabs 127 are each provided with two cavities, respectively dorsal and frontal, separated from each other by a perforated veil for the housing on either side of the web respectively of the projecting end of a sleeve 492 and a part of the elastic washer associated with the head of the fasteners 192, electrically isolated and with respect to the dissipator 16. The opening of the web allows the passage of the rod of the members 192. This rod passes through the sleeve 492 threaded in the hole 490 opening into the enlarged area 190 of the dissipator concerned. Elastic washers, here of the Belleville washer type (not referenced) associated with the heads of 192 members prevent loosening under the effect of vibration. The washers are best seen in Figures 9 and 14.

The tabs 127 are directed radially inwards to each contact with the front face of an enlarged area 190 of the base of the dissipator 16.

To reduce the axial size, the front face of an enlarged zone 190 is offset axially relative to the front face of the dissipator 16 and towards the front face of the sole 10 '. This is achieved in the embodiment of Figures 3 to 11 by cutting the material of the central fins 18 of the dissipator 16, that is to say by decreasing the length of these fins as best seen in Figure 7. The height of the cropped portion of these central fins 18, shortened in length, is a function of the axial height of the tab 127 so that the front face of the tabs 127 is in the extension of the front face of the fins 18. This zone 190 has a complementary shape to that of the corresponding tab 127. The length of the fins 18 defining the zone 190 is therefore a function of the diameter of the free end of the lug 127 of the connector.

The trace 320 has at one of these circumferential ends, an apparent tongue 332 centrally perforated for its electrical connection with a terminal 324, called terminal B +, intended to be connected via a cable to the positive terminal of the battery of the motor vehicle , bearing in mind that the bearing 50, here in aluminum, is intended to be connected to the mass of the motor vehicle. The terminal 324 comprises an electrically conductive body, here metallic. The body of the terminal (FIGS. 3, 10 and 11) is electrically insulated with respect to the bearing 50 via the bottom 21 of the housing 27. This body of the terminal 324 is in this case in contact with its edge with the enlarged outer periphery of the terminal. the circumferential end of the bottom 21 of the housing 27. This circumferential end (not referenced) is an extension of the bottom of the housing interposed between the terminal 324 and the bottom 56 of the bearing 50. This circumferential end has two protruding chimneys, one of which 326 enters an axially oriented through hole (not referenced) of the body of the terminal 324, to electrically isolate a fastening pin 327 from the terminal 324 to the bottom 56 of the bearing. This stud has two threaded portions disposed on either side of a nut associated with an elastic washer, for example of the unreferenced Belleville type. One of the fasteners 192 has the same shape as the stud 327. These studs are used for fixing the protective cover of the alternator (not visible) in a known manner by snapping; the bottom of the hood having tabs engaging the upper threaded portion of the stud.

An insulating barrel (not referenced) intervenes between the nut of the stud 327 and the terminal 324. This barrel is in the form of stepped sleeve diameter with formation of a shoulder due to the change of diameter for bearing the associated elastic washer to the dorsal face of stud nut 327 and electrically isolating stud 327 from terminal 324. The lower portion of the barrel is engaged in the through hole of the terminal 324, while the upper portion of the barrel is used to mount the nut 327 stud. The stud 327 and through the hole of the terminal 324 via the insulating barrel and the chimney 326 to screw in the tapped hole of the bottom 56 of the bearing 50.

The body of the terminal is also radially perforated for passage of a screw 328 on which is fixed with a nut the end of the connecting cable with the positive terminal of the battery of the motor vehicle. The screw has a head, here of square shape, for immobilization in rotation by shape cooperation with the body of the notched terminal 324 for housing the head of the screw 328.

The apertured tongue 322, of generally square section as the head of the screw 328, is sandwiched between the head of this screw and the body of the terminal 324. The threaded rod of the screw 328 passes through the hole of the tongue. 322 and the hole of the body of the terminal 324. Advantageously the rod of the screw 328 has a knurled part, like the diodes 93, 94, to engage with the edge of the hole of the terminal 324 and thus fix the screw 328.

The trace 309 of the connector 26 also has at one of its ends a bracket-shaped tab 323 centrally pierced its electrical connection with the bottom 56 of the bearing 50 connected to ground. This tab is located here at the other circumferential end of the connector 26 and the housing 27.

The bracket 323 is perforated for the passage of the rod of a screw 329 screwing into a tapped hole in the bottom 56 of the Bearing 50. An elastic washer, such as a Belleville washer, is associated with the head of this screw 329. The base of the bracket 323 is thus clamped between the head of the screw 329 and the bottom 56 of the bearing 50.

The connector 26 therefore has at each of its circumferential ends means 322, 323 for its electrical connection respectively with the terminal 324 and with the bearing 50 connected to ground.

Here there are six dwellings and therefore six phase outlets. Of course, as mentioned above, this depends on the applications. Thus five slots or four slots are provided when the alternator comprises respectively five and four phase outputs.

The housings and modules 100A are advantageously standardized. Modules may remain empty when the alternator has five or four phases instead of six. The single connector 26 is also of the standard type and is configured here for a number of modules equal to six.

Each sleeve 492 passes through the hole 490 of the enlarged central zone 190 of the dissipator 16 and protrudes on either side of the faces of this enlarged zone 190 to be fitted into a complementary central hole 521 facing each other. of the same housing formed in the bottom 21 of the housing 27. The tabs 127 of the connector are also configured to receive, by means of their dorsal cavity, each of the projecting end of the sleeve 492 and thus form a subassembly 26, 27, 100A as mentioned above. The length of a sleeve 492 is adjusted so that it comes into taken with the bottom 21 and the internal cavity of the leg 127 associated.

The fasteners comprise five screws and a pin of the stud type 327 all provided with spring washers adjacent to their head. The screws 192 and the stud 192 each pass through a sleeve 492, engaged in a hole 490 of the part 16, 10 'of the module, to be screwed into a tapped hole in the bottom 56 in order to fix the connector 26, the housing 26, 27 and the modules 100A, knowing that the sleeves 492 form a spacer between the bottom 21 and the connector 26.

Mounting is performed by first mounting (Figures 6 to 8) the diodes 93, 94 in the holes of the flanges 10 'for forming the modules 100A and making the connector 26 in the same place or a different place.

Then, in the same assembly location or in a different place, the modules 100A are mounted in the housings of the housing and, using the sleeves 492, a subset is formed comprising the connector 26, the modules 100A and the housing 27.

Then the shanks of the diodes 93, 94 are welded easily to the folds 350, the arms 321, 310 for forming the rectifier device for direct current ac. In this phase the welder easily performs a rotational movement, all arms 321, 309 being advantageously at the same height. The welding is in an embodiment of the laser type for performing welds by successive shots. In a variant, the weld is of the TIG type. In the same place of assembly or in another place of assembly, the fixing members are mounted and the current rectifying device 26, 10A, 27 is fixed on the bottom 56 of the bearing 50 by means of the screws and the 192. Of course, all the fastening members 192, 327 are alternatively screws when the cover of the alternator is fastened by means of specific screws on the rear bearing 50 or connecting rods between the front bearing. and rear of the alternator.

During this step, the terminal 324 is also mounted and the bracket 32 and the tongue 302 are respectively fixed on the bottom 56 and on the screw 328. This leads to the formation of the current rectifying arrangement of FIG.

Finally, the voltage regulator-brush holder assembly 14 (FIG. 11) is mounted, which is fixed in three points, here via screws, by means of two threaded chimneys of the bearing 50 and the other chimney of the housing not referenced and visible in Figure 3.

Of course, in a variant, it is possible to first fix the current rectifying device on the bearing before fixing the tails of the diodes.

The sleeves 492, in a variant, do not therefore serve to form a subassembly.

Alternatively, Figures 12 to 15, the dissipators 16 are modified. More specifically, the central fins 16 of the dissipator 16 are not trimmed and are longer than the central fins of FIGS. 7 and 8. The fins are all coming from the base 19. Here it is provided six main fins 18 Each of these fins is extended by secondary fins as best seen in Figure 13.

The fixing of each module is carried out in two points. To do this the base 19 of each module 100A comprises at each of its circumferential ends a zone for its attachment to the bearing 50 constituted by a fastening protrusion, respectively 701, 702, at the bottom 56 of the bearing 50. The drilling of a fixing zone is constituted by the central passage of the protuberance.

These protuberances 701, 702 are offset relative to each other in the axial direction and constitute connecting protuberances of a module to the adjacent module.

Of course with respect to the modules located at the circumferential ends of the housing 27, one of the protuberances does not constitute a protrusion of connection with another module.

We can then provide for these end modules a mixed solution with an enlarged area 190 as in Figure 7 and a protrusion 701 or 702 as in Figures 12 and 13. This is made possible by the standardization of the bearing and housing 27.

In the embodiment of Figures 12 to 15 the protuberances 701, 702 have a height less than half the thickness of the dissipator for reducing the axial size. In one embodiment, the protuberances have the same height overall. In another embodiment, the protuberances have a different height. Advantageously the sum of the heights of protuberances is generally equal to or less than the thickness of the dissipator

In these Figures 12 to 15 the protuberances 701, 702 consist of chimneys.

The chimney 701 will be called low chimney because its dorsal face is in the plane of the dorsal surface of the sole 10 'concerned, while the chimney 702 will be called high chimney.

As best seen in Figure 15, the chimneys 701, 702 of the same sink each has a central passage 590, here cylindrical, and are axially offset relative to each other. The chimney 701 is adjacent to the flange 10 ', while the chimney 702 is axially offset relative to the front face of the flange 10'. The dorsal faces of the base 19, the sole 10 'and the chimney 701 are generally in the same plane. The front face of the chimney 702 is recessed, that is to say closer to the end face of the bottom 56 of the bearing 50, with respect to the front face of the dissipator 16 in order to accommodate the heads of the fasteners 192. , all consisting here of screws associated with elastic washers in engagement with their head (Figure 14). The dorsal face of the chimney 702 is axially offset while being further away from the front face of the bottom 56 relative to the front face of the sole 10 '.

The chimney 701 of a module 100A is intended, according to one characteristic, to cooperate electrically with the adjacent chimney 702 of another module 100A. These chimneys 701, 702 are stacked, that is to say superimposed, one above the other so that their passage 590 be aligned. The two passages 590 correspond to the hole 490 of FIGS. 7 and 8.

Electrical isolation means intervene between adjacent protuberances 701, 702. These means comprise a sleeve 592 and, according to a characteristic, a flange 593.

More precisely, in the same way that the sleeve 492 passes through the hole 490, a sleeve 592 of electrically and thermally insulating material, here made of plastic material, passes through the two aligned passages 590 of the two superposed chimneys 701, 702. This sleeve 592 presents in its middle a flange 593 perpendicular. This flange 593 is intended to be interposed between the front face of the chimney 701 of a module 100A and the back face of the chimney 702 of the adjacent module 100A to electrically isolate the two chimneys 701, 702 stacked one on the other . The collar also thermally insulates the two chimneys and therefore the two adjacent modules 100A.

In Figure 15 the two chimneys 701, 702 are shown during assembly and are not yet in contact with each other.

The flange 593, according to one characteristic, is extended axially by two semi-cylindrical covers 594, 595 superimposed by being axially offset with respect to one another. The sleeve 592 is obtained by molding with its covers and collar.

The cover 594 is intended to partially envelop the chimney 701, while the cover 595 is intended to partially envelop the chimney 702. The covers 594, 595 are circumferentially offset by 180 °, one per report to the other. Covers 594, 595 are therefore also electrical and thermal insulation covers for insulating a chimney of a 100A module with respect to the heatsink of the adjacent module 100A. The adjacent modules are therefore thermally insulated from each other at the level of the chimneys, unlike the embodiment described in document FR 2 827 436.

As will be understood chimneys 701, 702, constituting the protuberances, are implanted in the radial space present between the two partitions 30, 230 in the extension of one another. The sleeve 592 enters the hole 521 'of the connector 26 concerned and is traversed by the fastener 192 which is screwed into the threaded hole vis-à-vis the bottom 56 of the bearing 50. The chimney 701 of one 100A module partially enters the adjacent housing of the other module 100A in favor of the space between the pair of two partitions 30-230. It is the same with the chimney 702.

The covers 594, 595 make it possible to mask the parts of the chimneys 701, 702 penetrating into the housing of the other module and thus to thermally insulate the two adjacent dissipators 16. The part 16-10 'of one of the modules 100A is therefore not thermally influenced by the part 16-10' of the adjacent module thanks to the presence of the covers 594, 595 circumferentially offset with respect to the other. These covers 594, 595, in combination with the collar 593 also electrically insulate the parts 16-10 'of these adjacent modules. As shown in Figures 12 and 13 the chimneys 701, 702 are rooted in the main part of the base 19 in favor of a strip of material 596. Each chimney is provided with a protruding fin 597, which is shorter and parallel to the fin 18 vis-à-vis. A blind passage thus exists between the faces facing the two wings 597, 18. This passage is closed at its base by the material strip 596. The other face of the fin 597 is connected to the rest of the outer periphery of the chimney. This fin 597 therefore delimits a first portion of the outer periphery of the chimney 701, 702. The second portion of the outer periphery of the chimney is of generally semi-cylindrical shape, which is delimited by a shoulder 598 extending the strip of material 596. Each cover 594, 595 is remote from the shoulder 598 and substantially surrounds this second part. After mounting the chimneys 702, 701 one above the other the fins 597 chimneys are circumferentially offset 180 ° relative to each other.

In a variant, the second part of the outer periphery of the chimney is modified. This second part has for example sectors of polygonal or square, or rectangular. Caches 594, 595 are configured accordingly to hide this second part. The protuberances 701, 702 are therefore not necessarily chimneys with an outer periphery comprising a semi-cylindrical part.

In all cases, a chain of 100A modules is electrically isolated and thermally isolated. relative to one another by means of the sleeves 592 with collar 593 and with covers 594, 595. The partition walls 30, 230 of the housing 27 also make it possible to increase the thermal and electrical insulation of the modules relative to one another. For six modules there are thus provided seven fasteners 192, an additional fastening member with respect to the embodiment of Figures 3 to 11.

It follows from the foregoing that each module 100A is fixed at two points stably and electrically and thermally insulated while having large central fins.

Fixing is thus safer and more reliable by being less sensitive to vibration phenomena. The number of fastening members 192 is also reduced, for fixing each module at two points.

In addition, the connector 26 is modified by the position of its tabs 127, which bear on the end faces of the chimneys 702, the outer periphery of the base 19 being corrugated as in FIGS. 7 and 8.

The housing 27 is modified because it has at each of its circumferential ends an additional chimney for replacing the chimney 701 and cooperating with the chimney 702 of the end module implanted at the circumferential end concerned housing.

The fastener passed through these stacked chimneys. The electrical insulation means is reduced to a simple sleeve 592. As can be seen from the description and the drawings, the current rectifying device 26, 100A, 27 forms a compact assembly radially and axially with diodes of axial orientation and dissipators 16 facing the air inlets 51. The tails of the diodes are remote from the air outlets 53 by being located inside the outlets 53. They are therefore not heated by the outlets 53 and less sensitive to recirculation of the air.

The position of the connector 26, of compact shape, at the outer periphery of the housing 27, more precisely outside the dissipators 16, makes it possible to weld easily over the tails of the diodes 93, 94 while having heat sinks, of great size with many fins, located next to the openings of the bearing.

The connector 26, common to all the modules, makes it possible to reduce the number of parts and to simplify the bearing 50, in particular by eliminating the projections of FIGS. 11 and 12 of the document FR 2 911 444 and the connecting pieces of the document FR 2 919 770, while decreasing the radial size.

The connector 26 allows at each of its circumferential ends a single connection with the terminal B + (the terminal 324) and with the mass via the bottom 56 of the bearing.

One could have thought of implanting the connector at the inner periphery of the support of the diodes as in the document FR 2 729 802, but in this case we can not equip the modules with dissipators because of the presence of such a connector to the internal periphery of the modules. This connector 26 also protects the diodes 93, 94 of axial orientation by masking the front face of the caps thereof.

The heatsinks 16 make it possible not to modify in a deep manner the bearing 50, which is simplified because of the absence of mounting holes for the ends of the negative diodes 94.

The bottom 56 of the bearing is thus generally of flat shape, disregarding the presence of its different chimneys.

The protruding flanges 10 ', of less thickness than the dissipator 16, make it possible to implant the connector 26 and the tails of the axially oriented diodes without unduly increasing the axial size.

These flanges 10 'make it possible to optimize the heat exchange with the caps of the diodes, in particular when the knurled part thereof is axially offset with respect to the dorsal face of the caps of the diodes.

In addition, the soles make it possible to reduce the quantity of material and to receive the pellets of the diodes 93, 94, which respectively constitute the anodes of the positive diodes and the cathodes of the negative diodes.

The secondary fins 180 can evacuate more heat and better homogenize at will the temperature of the diodes. The rotating electrical machine can therefore work at even higher temperatures without destruction of the diodes.

The housing makes it possible to electrically and thermally isolate the modules from each other by means of the partitions housing 30 so that the temperature of the diodes 93, 94 is more homogeneous from one module to the other. Assembly times are reduced.

We also reduce the number of pieces. As a variant, the modules have the shape of the modules 100 of FIGS. 1 and 2. In this case, each end of the circumferential end of the base 19 is provided with a protuberance, such as a chimney 701, 702. In this case, the room 40.

Alternatively the modules are mounted in a housing of the type of that of Figures 3 and 5. In this case the partitions 30, 230 have the same height and are separated from each other by a space for the passage of chimneys 701 702. The electrical connections can be made as in Figure 12 of document FR 2 911 444.

The fins 18 of the modules 100 are alternatively, in the aforementioned manner, extended by secondary fins 180 penetrating at least partly in the openings 51. Of course, the present invention is not limited to the described embodiments.

Thus in a degraded embodiment the partitions 30, 230 and the wall 129 are removed.

The housing, in one embodiment is reduced to a plate with flanges as in the document FR 2 919 770.

In yet another embodiment, the axial height of the partitions is reduced. The current rectifying elements consist of an embodiment in electronic chips mounted to fix on the front face of the soleplate

Thus alternatively the tabs 310, 321 are axially oriented for electrical contact with a conductive element of the front face of the chip.

The part 16, 10 'as an alternative is not necessarily monobloc.

More specifically, as a variant, the soleplate 10 'is attached to the dissipator 16, for example by a connection of the tenon-mortise type with, for example, a complementary fastening, for example by gluing or by laser welding of the type by transparency.

In this embodiment the sole 10 'and the dissipator 16 are advantageously copper to facilitate laser welding.

The parts of the part 16-10 'are alternatively of different material.

It appears from the description and the drawings that in all cases the two-part part 16-10 'is cut at its outer periphery to form a sole which, viewed in the axial direction, is of a thickness less than thickness of the dissipator 16. This arrangement reduces the thickness of the part 16-10 'to the outer periphery of the bearing, the current rectifying elements, such as diodes extending perpendicular to the sole 10' and the bottom of the bearing 50 so that the solution is compact radially and axially. In yet another variant the dissipator 16 has a trapezoidal frame in which is mounted a strip of material in the form of an accordion, which replaces the fins 18.

The strip of material is not necessarily the same material as the sole-frame assembly. For example, the sole-frame assembly is made of moldable material, for example based on aluminum, and the strip of copper material. Some portions of the material web may be axially extended to at least partially penetrate an opening 51 such as the secondary wings 180.

As a variant, as can be seen in FIG. 10 of the aforementioned document FR 2 911 444, the trapezoidal dissipater 16, instead of fins 18, has slots of oblong shape delimited by strips of material. These strips of material, in one embodiment extended by secondary fins 180. The fins 18, instead of being thin, are in another embodiment more thick.

The dissipator 16 may have another shape and comprise for example a plurality of holes.

The heatsink is alternatively copper, the fins, the slots, the holes and the frame being made by machining.

Alternatively one can create a module to rectify the neutral point when the outputs of the phases are connected in star.

The diodes are alternatively high performance diodes, such as LLD type diodes (low leakage diodes) or junction diodes of the Schottky type. These diodes may not have tails.

The electric machine may be a brushless variant, as can be seen in document FR 2 744 575, so that the presence of the brush holder is not obligatory, which may make it possible to mount an additional module.

In light of this document we see that alternatively the current rectifier is carried by the front bearing.

We can implement elsewhere the voltage regulator and thus mount one or more additional modules depending on the applications. Alternatively the internal fans are removed and replaced by an external fan so that the air passes axially through the housing of Figure 1, devoid of openings 53, in favor of the openings 51 made in the front and rear bearings.

Alternatively, as described in document FR 2 744 575, a centrifugal pump is used for the circulation of air which draws air inside the housing of the alternator and delivers it by a channel. Similarly, the invention is applicable to the case where the rotor is a protruding pole rotor possibly with magnets as described in WO 02/054566.

Similarly the claw rotor can be assembled by crimping to the shaft and include magnets between his teeth as shown in Figure 2 of FR 2905 806 to which reference will be made. Magnet solutions increase the power of the machine and are compatible with the modules according to the invention because they are well cooled.

The solution according to the invention makes it possible to preserve the structure of the rotor.

As a variant, the current rectifying device 26, 27, 100A is mounted on a perforated mezzanine carried by the bearing 50 as described in the aforementioned document WO 2004/040738.

In all cases the housing and therefore the current rectifier is carried by the bearing front or rear concerned.

The structures can be reversed so that, alternatively, the current rectifying device is carried not by the end face of the bearing of the machine housing but by the dorsal surface of the bearing forming a protective cover.

In this embodiment the bearing concerned is elongated axially and it is the bottom 56 of the bearing which carries the housing for the rear bearing of the alternator; the slip rings being located upstream of the bottom 56 and the rear bearing.

The housing of the machine may have more than two parts. For example, the housing may comprise a front bearing, a rear bearing and an intermediate portion carrying the stator.

The centrifugal fan 57 of the figure

1 is alternatively axial action so that the presence of the openings 53 is not mandatory. The machine is alternatively also cooled by fluid circulation. For example one can remove the front fan associated with the front bearing and achieve in the front bearing a channel for circulating a coolant, such as the coolant of the engine of the vehicle.

The invention is applicable in the case where the rotating electrical machine is associated with a fixed heat engine.

The modules can carry other electronic components.

In a variant, the openings in the housings of the housing may be different from one housing to the other.

Thus housings may have trapezoidal openings and other modules of different shaped openings.

The connector 26, in one embodiment is supported on the partitions 230. Alternatively, as shown in Figure 5, the partitions have projections 232 for local support of the connector 26 and prestressing thereof to not be sensitive to vibration phenomena.

The connector 26 is thus supported on the dissipators 16 by these tabs 127 and on the projections 232 of the partitions 230.

In a variant, the sleeves 492, 592 bear only on the dorsal surface of the tabs 127.

It can be seen from the description and the drawings that, thanks to the soleplate, the current rectifying elements carried circumferentially by the soleplate can be circumferentially distant from each other by a desired distance. The distance separating the current rectifying elements from each other is greater than that separating these elements in the documents FR 2 911 144, FR 2 919 770.

Indeed it is possible in these documents to remove the current rectifying elements of the outer periphery of the bearing by bringing these elements towards the center of the bearing, but in this case the size of the plate and the base is reduced so that the distance between the current rectifying elements is not sufficient.

Thanks to the invention the heatsink can be of the desired size while having standard type current rectifying elements separated from each other by a strip of material having the required width. In addition there is room to implant the protrusion or protuberances.

Claims

1. Current rectification arrangement comprising a current rectifier (100A, 26) and a perforated bearing (50) belonging to a polyphase rotating electrical machine, in particular a motor vehicle alternator, said electrically insulating bearing (50) the current rectifying device comprising at least two modules (100A) each comprising a part (16-10 ') provided with at least one fixing zone (701, 702) for fixing it on the bearing of the electric machine and provided with on the one hand, a first electrically conductive support portion (16) for current rectifying elements (93, 94), such as diodes, a phase of the rotating electrical machine, and the other , a second portion (16) forming a heat sink provided at its outer periphery with a base (19) integral with the first part, characterized in that each module (100A) has at least one of its circumferenced ends the base (19, 19) of a fastening zone in the form of a protrusion (701, 702) for connection with the other module, in that the protuberances (701, 702) for connecting two adjacent modules are, on the one hand, configured to be superposed and on the other hand, are drilled (590) for the passage of a fastener (192) of the modules to the bearing, in that electrical insulation means (592, 593) intervene between the two protuberances (701, 702) and comprise a sleeve (592) penetrating into the aligned holes (590) protuberances (701, 702) superimposed and in that the sleeve (592) has a flange (593) intended to be interposed between the ends of the two protuberances (701, 702) superimposed two adjacent modules.

2. Arrangement according to claim 1, characterized in that the flange (593) is extended by two covers (594, 595) each dedicated to a protuberance and in that the covers (593, 594) are superimposed and offset circumferentially 180 ° with respect to each other.

3. Arrangement according to claim 1 or 2, characterized in that the electrical insulation means (592, 593) are also thermal insulation means.

4. Arrangement according to any one of the preceding claims, characterized in that the height of a protuberance (701, 702) is less than or equal to half the thickness of the dissipator (16).

5. Arrangement according to any one of the preceding claims, characterized in that each base (19) of a module (100A) has at each of its circumferential ends a protrusion (701, 702) connecting, in that the two protuberances are offset relative to one another and in that one of the protuberances (701) is closer to the dorsal face of the dissipator (16) than the other protuberance (702) closer to the front face of the dissipator (16).

6. Arrangement according to any one of the preceding claims, characterized in that the protuberances consist of chimneys (701, 702) each having a bore (590) in the form of a central passage and in that both chimneys (701, 702) of the two adjacent modules are configured to be stacked one above the other.

7. Arrangement according to any one of the preceding claims, characterized in that the first portion (10 ') of the piece (16-10') of a module (100A) consists of a sole projecting outwardly relative to to the second portion (16) and in that the sole (10 '), seen in the axial direction, is of a thickness less than the thickness of the second heat sink portion (16) so that the front face of the second portion (16) is offset axially with respect to the front face of the first portion (10).

8. Arrangement according to claim 7, characterized in that the heat sink (16) and the sole (10 ') of the part (16-10') of a module (100A) are electrically and thermally conductive material.

9. Rotating electrical machine, such as an alternator of a motor vehicle with internal ventilation, characterized in that it carries a rectifying arrangement of current according to any one of claims 1 to 8.

10. Machine according to claim 9, characterized in that the bearing (50) apertured door modules (100A) via a housing (27) of electrically insulating material and thermally insulating, such as plastic.

11. Machine according to claim 10, characterized in that the housing (27) comprises a perforated bottom (21) adjacent to the bearing (50) and partitions (30, 230) to form housing mounting modules (100A) and in that each partition is in two parts (30, 230) spaced from one another to create a passage space for the protuberances (701, 702).

12. Machine according to any one of claims 9 to 11 taken in combination with claim 8, characterized in that it comprises a connector (26) implanted opposite the front face of the sole (10 ') in favor the difference in thickness between the sole (10 ') and the dissipator (16) of a module (100A).

13. Machine according to claim 12, characterized in that its bearing (50) carries a plurality of modules (100A) each having a pair of rectifying elements of currents consisting of diodes (93, 94), in that the diodes (93, 94) each have a shank (96, 97) and a base extending perpendicular to the sole (10 ') and in that the connector (26) has two parallel traces (320, 309) each with connecting arm (321,310) to the tails (96,97) of the diodes (93,94).

14. Machine according to any one of claims 9 to 13, characterized in that the bearing (50) comprises a bottom (56) provided with air inlet openings (50) and in that the dissipator (16) ) of at least one module (100A) has secondary fins (180) penetrating at least partially in the air inlet opening (51) concerned bearing (50).