FR2995741A1 - Support for temperature sensor of stator e.g. armature of revolving electric machine, in electric car, has branch carrying sensor, and another branch, where former and latter branches are connected to each other by connection branch - Google Patents

Abstract

The support (341) has a branch carrying a temperature sensor (303), and another branch carrying a click-and-ratchet work system (342) that is intended to cooperate with a maintenance element (361) arranged interdependent of a stator e.g. armature, of a revolving electric machine e.g. alternator. The former branch and the latter branch are connected to each other by a third branch known as connection branch. The sensor is provided at a free end of the former branch of the support. The former branch includes a rectangular section. An independent claim is also included for a revolving electric machine.

Description

995 74 1 1 TEMPERATURE SENSOR FOR STATOR OF ELECTRIC MACHINE AND ELECTRIC MACHINE COMPRISING SUCH SENSOR [01] TECHNICAL FIELD OF THE INVENTION [02] The invention relates to a temperature sensor for a stator of a rotating electrical machine and a rotary electric machine including such a sensor. [03] The invention relates to the field of electrical machines such as motors, alternators, or alternator-starters. [04] The invention finds a particularly advantageous application with alternators used in so-called "range-extender" systems intended to increase the autonomy of electric vehicles. These systems comprise for this purpose a low-power heat engine mechanically rotating the alternator intended to provide, when necessary, electrical energy to the power supply batteries of an electric traction motor of the vehicle. [5] STATE OF THE ART [6] Electrical machines are known having a stator and a rotor integral with a shaft. The rotor may be integral with a drive shaft and / or driven and may belong to a rotating electrical machine in the form of an alternator as described in EP 0 803 962 or an electric motor as described in EP 0 831 580. [7] The electric machine comprises a housing, also called casing, carrying the stator. This housing is configured to rotate the shaft for example by means of bearings, such as ball bearings and / or needle. The rotor may comprise a body made of laminated sheet metal, which comprises housing. Permanent magnets are positioned inside at least some of these housings as can be seen for example in FIGS. 1 and 2 of EPO 80 3962. [8] As described in document FR 2 890 798 to which reference will be made for more In addition, the machine comprises a claw rotor and a stator body in the form of a bundle of plates with teeth for mounting coils belonging to the stator winding. The body of the stator has notches open towards the inside delimited each by two consecutive teeth. These teeth have parallel edges, a strip of material, called breech existing between the bottom of the notches and the outer periphery of the body. In this document the electrical machine is polyphase and comprises a stator winding having a plurality of preformed coils.

More precisely, the teeth of the stator body are mounted on the preformed coils made from a wire wound on several turns. The son consist for example of a copper wire coated with enamel. [9] As can be seen in FIG. 1, each coil is mounted around an electrically insulating slot insulator 1 having a body 2 having walls 4 delimiting a frame 5 of generally rectangular shape. The body 2 of the insulation further comprises a front flange 7 and a rear flange 8 defining with the walls 4 of the frame 5 a mounting groove of a coil 9. The rear flange 8 is intended to be positioned near the cylinder head 6 while the front rim 7 is located on the inner side of the electric machine. The assembly is intended to be threaded around the tooth 10. [10] In one embodiment, two coils are implanted in the same notch, each coil being wound around one of the teeth delimiting the notch by the intermediate coil insulation. [01 1] The coils are interconnected together, for example by welding or with the aid of an interconnector to form a phase of the machine which may be of the polyphase type. According to the document US5343613, it is known to implant a temperature sensor inside the machine. This sensor is connected to the power stage comprising the inverter and the control stage, as described, for example, in EPO document 831 580. The control stage cuts off power to the electric machine in the event of detection of overheating to prevent damage. [013] OBJECT OF THE INVENTION [14] The invention aims to facilitate the implantation of the temperature sensor inside the electric machine. To this end, the subject of the invention is a support made of electrically insulating material for a stator temperature sensor of a rotating electrical machine, characterized in that it comprises a first branch bearing a sensor and a second branch carrying a system latching intended to cooperate with a holding element integral with the stator of the rotating electrical machine, these two branches being connected to one another by a third branch called said connecting branch. According to other characteristics taken separately or in combination - The sensor is located at the free end of the first leg of the support. - The free end of the first branch of the support is chamfered. - The first branch is of rectangular section. - At least two of the lateral edges of the first branch are chamfered - the sensor is fixed by overmolding on the first branch). - Electrical wires are connected to the sensor and embedded in the first branch. - The first and second branches are bent on the same side 30 with respect to the connecting branch. - The support has a generally U-shaped with a second branch carrying the latching system, shorter than the first branch. The latching system, intended to cooperate with the holding element (361), comprises two portions terminated by two flanges projecting radially and spaced from one another. [015] The invention also relates to a rotating electrical machine comprising a stator and a holding element integral with the stator and provided with an opening to cooperate with the latching system of the support (341 According to other characteristics of the machine taken singly or in combination - The portions of the latching system are slightly spaced apart from one another to allow them to deform upon insertion into an opening defined by the holding member. opening is of oblong shape - the opening has a dimension less than an external gap between the flanges of the portions - the electric machine is of the polyphase type, and its stator comprises, on the one hand, a winding with several coils and a neutral and secondly, an interconnector comprising at least four ring-shaped frames stacked axially on each other and isolated from each other, each frame bearing on its periphery series internal tabs projecting inwardly of the frame to the welding of the stator coil ends (11). The interconnector further comprises a holding element for a temperature sensor overmoulded on a support comprising a latching system designed to cooperate with said holding element. - The stator includes teeth, a coil with multiple coils and at least one coil insulator, this coil insulator has a body having frame-forming walls and a leading edge and a trailing edge defining with frame walls a mounting groove for winding a coil. This coil insulator comprises a hollow flexible tab carried by one of the edges of the coil insulator, this tab delimiting a housing intended to receive the first branch of the support of the temperature sensor. The tab exerts an elastic action against the first branch of the temperature sensor so as to keep it in contact with the coil. - The tab is elastically connected to the flange by a strip of material thickness reduce. Grooves are formed around the leg. [16] BRIEF DESCRIPTION OF THE FIGURES [17] The invention will be better understood on reading the description which follows and on examining the figures which accompany it. These figures are given for illustrative but not limiting of the invention. [18] Figure 1, already described, shows a coil insulation according to the state of the art to be mounted around a tooth of a stator; [19] Figures 2a and 2b show respectively perspective views of a single stator and a wound stator provided with an interconnector according to the invention; [20] Figure 2c shows a detailed view of the connections between a stator coil and the interconnector according to the invention; [21] Figures 3a to 3c respectively show perspective views from above and below the interconnector according to the invention; [022] Figure 4 shows, in a perspective view, a phase frame of the interconnector according to the invention; [23] Figure 5 shows a perspective view of a stack of frames forming the interconnector according to the invention; [24] Figure 6 shows a cross-sectional view of the stack of frames of the interconnector according to the invention; [025] Figure 7 shows, in a detailed perspective view, a connecting lug of the interconnector according to the invention; [026] Figure 8 shows, in a perspective view, the detail of the connection between an indexing pin of the interconnector according to the invention with a coil insulation guiding system; [027] Figure 9 shows, in a perspective view, a coil insulator for mounting on the teeth of the stator according to the invention. [028] Figures 10a and 10b show views in perspective and in cross section of a coil insulator according to the invention provided with a tab defining a housing for receiving a temperature sensor; [029] Figures 11a and 11b show two embodiments for obtaining an elastic effect for a leg provided with a hole for insertion of a mounting tool; [30] Figures 12a and 12b show the steps for positioning the temperature sensor in the housing of the tab with the mounting tool; [31] Figures 13a to 13c show perspective views corresponding to an embodiment in which the temperature sensor is overmolded on a support attached to the interconnector. [32] Identical, similar or similar elements retain the same reference from one figure to another. [33] DESCRIPTION OF EXAMPLES OF EMBODIMENT OF THE INVENTION [34] FIGS. 2a and 2b show an X-axis stator 11 having a body 12 having teeth 14 regularly distributed on the inner periphery as well as notches 15 open towards the interior, two consecutive notches 15 being separated by a tooth 14. These teeth 14 are parallel edges in pairs, a strip of material, corresponding to the yoke 17 between the bottom of the notches 15 and the outer periphery of the body 12 The body 12 is formed by a stack of sheets made of ferromagnetic material extending in a radial plane perpendicular to the axis X. The package of sheets is held by means of rivets (not shown) passing axially through them. stacking of sheets. [35] The stator belongs to a polyphase rotating electrical machine comprising in this embodiment a stator winding having a plurality of coils 19, here preformed, and a neutral point, said to be neutral of the machine, visible for example in FIG. 1 of EP 0 831 580.

The coils 19 are interconnected with each other by means of a compact interconnector 22 comprising a plurality of frames 31-34, one of which 31, called the neutral frame 31, is connected to the neutral of the rotating electrical machine.  [36] More specifically, as can be seen in FIG. 2b, the preformed coils 19 forming the winding of the stator 11 are mounted on the stator teeth 14.  These coils 19 are made from a wire wound on several turns.  The son consist of an electrically conductive wire, for example a copper wire and / or aluminum, coated with an electrical insulator, such as enamel.  The son may be of circular, rectangular or flat-shaped section.  [037] In one embodiment, two coils 19 are implanted in the same notch 15, each coil 19 being wound around one of the teeth 14 delimiting the notch via a coil insulator 20 insulator 20 is an electrical insulator made in this embodiment of electrically insulating and moldable material.  The ends 191, 192 of each coil 19 protrude axially from the coil on the same side of the corresponding stator 11 in FIG. 2b to the upper side of the stator 11.  Preferably, the ends 191, 192 of the coils 19 are located substantially along the same circumference on the side of the free end of the teeth 14, that is to say on the far side of the cylinder head. 17 and the nearest side of the gap between the inner periphery of the stator and the outer periphery of the rotor that comprises the electric machine.  Each coil 19 has a first end 191 called "input" intended to be connected with the other inputs alternately to belong to one of the phases U, V, W of the machine and a second end 192 called "output" intended to be connected to the neutral of the electric machine.  For this purpose, the coils 19 are interconnected to form the different phases U, V, W using the interconnector 22 of axis X1 coinciding with the X axis when the interconnector 22 is installed on the stator 11.  [38] More precisely, as can be seen in FIGS. 5 and 6, the interconnector 22 comprises four annular-shaped frames 31-34 extending in a radial plane.  The frames 31-34 are electrically conductive, for example being of copper or advantageously of another weldable metal material.  These frames 31-34 have substantially identical internal and external diameters.  The outer diameter of the frames 31-34, substantially corresponding to the external diameter of the interconnector 22, is smaller than the external diameter of the stator 11, constituted by the external diameter of the yoke 17, to facilitate an impregnation operation 20 of the coils 19 and reducing the diametral bulk.  These frames 31-34 are stacked axially on each other and electrically insulated from each other.  Each frame 31-34 carries on its inner periphery apparent tabs 36 projecting radially inwards towards the frame for welding the ends 191, 192 of the stator coils.  Preferably, the frames 31-34 are embedded in a body 38 made of electrically insulating material, such as plastic.  A layer of electrically insulating material 38 is present between each frame as visible for example in FIG.  [39] One of the frames 31, called a neutral frame, is intended to be connected to the neutral of the winding of the electric machine comprising the coils 19 arranged here in a star configuration with a neutral point formed in favor of the frame 31.  This neutral frame 31 is located at one end of the stack of frames 31-34, here at the farthest end of the yoke 17.  Since each coil 19 has an output end 192 connected to the neutral, the neutral frame 31 has a number of tabs 36 equal to the number of coils 19, in this case equal to 15.  [40] The other three frames 32-34, said phase frames, are intended to be each connected to the inputs 191 of the coils 19 of the phase U, V, W concerned the electric machine, here of three-phase type.  The inlet ends 191 of the coils 19 are thus alternately circumferentially connected to the phase outputs of the winding of the electrical machine via one of the phase frames 32-34 of the interconnector 22.  The phase frames each comprise a number of tabs equal to the number of coils divided by the number of phases of the machine, here 15/3 = 5 (cf.  Figure 4).  More precisely each phase comprises five coils 19 electrically interconnected by one of the frames 32-34, the number of legs 36 is equal to five.  [41] For this purpose, as shown in Figures 2b, 3a, 3b and 3c, 4 and 5, each phase frame 32-34 has on its outer periphery a terminal 41-43 connection for interconnection with a connector power supply (not shown) itself connected to an inverter described for example in the document EP 0 831 580.  These terminals 41-43 connection side-by-side have a U-shaped end and are the outputs of the phases of the coil winding 19 of the machine.  It will be appreciated that the terminals 41-43 are simplified with respect to the terminals described in US 2005/0253466 because they are part of the frames 32-34.  These terminals 41-43 are rigid and compact.  [42] The tabs 36 of the various frames 31-34 are angularly offset relative to each other.  In addition, to have enough room to pinch a tab 36 and an end 191, 192 of a coil 19 with a welding electrode, an assembly 47, formed by a tab 36 of one of the frames of phase 32-34 and a tab 36 of the neutral frame 31 intended to be welded on the ends 191, 192 of the same coil 19, is configured to be positioned between the sides 50, 51 of said coil 19 extending between the axial ends of the coil 19 (cf.  Figures 2c and 3b).  More precisely, the tabs 36 of the assembly 47 are in contact with the zones facing the ends 191, 192 as best seen in FIG. 2c.  Note that the ends 191, 192 are shifted towards each other.  [43] Furthermore, as can be seen in FIGS. 2c and 3a, the neutral frame 31 being situated at one end of the stack of the frames 31-34, the tabs 36 of the neutral frame 31 are directed, following a axial direction, in a reverse direction relative to the tabs 36 of the phase frames 32-34, so that all the tabs 36 of the interconnector 22 is at the same height as the coil ends 191, 192.  Indeed, the tabs 36 of the neutral frame 31 are directed in the axial direction referenced L1; while the tabs 36 of the phase frames are directed in the opposite axial direction referenced L2.  Such a configuration which limits the distance between the tabs 36 of the interconnector 22 and the ends of the coils 19 makes it possible to reduce the length of the winding wires.  [44] In an embodiment shown in FIG. 7, each tab 36 has an L-shaped portion having a first arm 361 derived from the inner periphery of a frame 31-34 which extends inwardly of the frame 31-34 and a second arm 362 perpendicular to the first arm 361.  The tab 36 also includes a head 363 on which is welded the end 191, 192 of a coil 19.  This head 363 connected to one of the edges of the second arm 362 has a hollow convex shape.  The L-shaped portion of the tabs 36 of the neutral frame 31 is folded in a reverse direction with respect to the L-shaped portions of the tabs 36 of the phase frames 32-34.  Preferably, in an assembly 47 of two tabs 36 intended to be connected to an inlet 191 and an outlet 192 of the same coil 19, the hollow portions of the heads 363 of these two tabs 36 are turned toward each other .  [45] Furthermore, as shown in FIGS. 2b, 3a, 3b, 3c and 8, the interconnector 22 comprises pins 53 making it possible, during assembly, to index the interconnector 22 with respect to the coils 19 in order to reduce the risk of poor connections between coils.  These indexing pins 53 of axial extension are borne by an outer periphery of the interconnector 22.  According to one embodiment, these pins 53 comprise a material base with the outer periphery of the interconnector 22 carrying a substantially cylindrical rod 58 having a beveled free end 11.  These indexing pins 53 are intended to cooperate with guide systems carried by the coil insulators 20.  As can be seen in FIGS. 2b and 8, these guidance systems are formed by protuberances 54 defining a passage for an indexing pin 53.  To facilitate the insertion of the indexing pins 53 between the protuberances 54, the protuberances 54 are shaped in such a way that the passage has a slightly flared shape at its end opening towards the ends 191, 192 of the wire of the coil 19.  In this case, the interconnector 22 has two indexing pins 53.  [046] As can be seen in FIGS. 2b, 3a, 3b, and 3c, the interconnector 22 also has support feet 61 intended to rest on a rim of the yoke 17 of the stator 11.  These bearing feet 61 have an L shape with one end fixed to the outer periphery of the body 38 and one end terminated by a support 62 resting on the rim of the yoke 17.  The support 62 has recesses 63 visible in FIG. 3c intended to receive ends of the fastening rods of the stator.  [47] The support legs 61 are here four in number distributed regularly around the body 38.  Two successive support feet 61 are thus angularly spaced at a 90 degree angle.  The bearing feet 61 make it possible to hold the body 38 of the connector 22 above the coils 19 without the body 38 being in contact with the coils 19.  In addition, the circumferential size of the feet 19 is sufficiently small to prevent the interconnector 22 completely covering the outer periphery of the coils 19, which facilitates the cooling of the stator 11 due to the large clearance zone between two feet of 61 successive support and the space between the body 38 of the interconnector 22 and the coils 19.  [48] The shapes of the indexing pins 53 and the bearing feet 61 may be obtained by molding.  [49] In a nonlimiting embodiment, the interconnector 22 comprises frames 31-34 made of copper having internal diameters D1 of the order of 198.5 mm and external diameters D2 of the order of 218. , 5 mm (cf.  Figure 3b).  These frames 31-34 are separated from each other by a thickness E of insulating material of the order of 1.6 mm (cf.  Figure 6).  [50] Furthermore, the coil insulator 20 is made of electrically insulating material, for example plastic material such as PA 6. 6, which may be reinforced by fibers, such as glass fibers.  As shown in FIG. 9, the coil insulator 20 comprises a body 201 formed by a frame 202 as well as a front flange 203 and a rear flange 204 defining with the walls of the frame 202 a groove for mounting the coil 19, as shown in Figure 2b.  The rear flange 204, intended to be positioned on the side of the yoke 17, is extended on one side by a heel 207; and the other by a fin 208 via a folding zone 209.  The heel 207 is thinner and narrower than the fin 208.  The heel 207 reduces the voltage drop between the yoke 17 and the coil 19 concerned.  [51] The coil insulation 20 further includes grooves 211 blind in the inner faces of the upper and lower walls of the frame 24.  The non-opening side of the blind grooves 211 is located on the inside of the machine in order to prevent the impregnation varnish from flowing inside the machine and at the gap delimited by the free ends of the teeth. 14 and the outer periphery of the rotor of the machine.  [52] Preferably, as shown in FIGS. 2b and 9, the longitudinal edges of the front flange 203 are configured at one of their ends 213 to serve as a wire guide for each end 191, 192 of the coil 19.  For this purpose, the longitudinal edges of the flange 203 have at one end the shape of a bowl receiving one end of the wire.  The wire of the coil 19 can be held in position for welding the connector 22 by resting on the side faces of the bowl.  [053] Each flange 203, 204 has two longitudinal edges and two transverse edges interconnecting the longitudinal edges of greater length.  The heel 207 and the fin 208 are derived from the longitudinal edges of the rear flange (see FIG. 9).  Thus in other embodiments the fin 208 may be fixed by means of a latching system with the longitudinal edge of the front flange 203 located on the side of the fin 208.  The snap system may be formed by tabs carried by the longitudinal edge of the front flange 203.  These tabs are intended to cooperate by snapping with windows formed in the wall of the fin 208 and may each have the shape of a hook having a triangular ramp-shaped side terminated by a flange for retaining the fin 208 after that paw went through a window.  The folding zone, the edge of the vane 208, located on the side of the windows, is also thinned to allow optimal plating of the fin 208 against the side of the coil.  [054] Alternatively, the latching system may be formed by a notch formed in the thickness of the front flange 203.  The free edge of the fin 208 then forms a tongue intended to fit inside the notch to hold the fin 208 folded against the body 23 of the insulator 20.  For this purpose, the portion of the fin 208 forming the tongue may have a thinner thickness to facilitate the positioning of the tongue within the notch and to ensure a good plating of the fin 208 against a lateral side of the coil 19.  [055] In an embodiment according to the invention at least one of the insulators 20 is configured to receive a temperature sensor 303 carried to a fixation according to a characteristic by an electrically insulating support 341 partially visible in Figure 10b and visible in Figures 13a to 13b.  The sensor 303 may be overmoulded on the support 341.  Alternatively the sensor 303 may be fixed by gluing or any other means on the support 341.  As shown in FIGS. 10a and 10b, this specific insulator 20 comprises a flexible and hollow lug 301 carried in this embodiment by the upper transverse border of the front flange 203.  This tab 301 defines a housing 302, clearly visible in Figure 10b, open on the side of the coil 19 and for receiving a temperature sensor 303.  This sensor 303 is connected, here by electrical wires visible in FIG. 13a, to the control and control stage of the machine (not shown) able to cut off the supply of the stator coils 11 when overheating of the machine is detected.  The control and control stage belongs to the electronics of the electrical machine also comprising a power stage equipped with an inverter as described for example in the aforementioned document EP 0 831 580.  The temperature sensor 303 is preferably a CTN (Negative Temperature Coefficient) type sensor.  Of course, in a variant, a sensor 303 of the CTP type (Positive Temperature Coefficient) is used, this depending on the applications.  These CTN and CTP sensors are thermistors whose resistance varies as a function of temperature.  [56] As best seen in FIGS. 13a to 13b, the carrier 341 is equipped in this embodiment with a snap-fit system 342, which allows the carrier 341 to be attached directly or indirectly to the stator 11 via an electrically insulating holding member 361.  In this embodiment, the holding element 361 is fixed directly to the stator 11 by being carried by the internal periphery of the interconnector 22 belonging to the stator 11.  The connection of the temperature sensor 303 to the control stage is carried out by the wires referenced 343.  In this embodiment the sensor is fixed, for example by overmolding or gluing on a first branch 344 of the support.  [57] More specifically, the support 341 comprises a first branch 344 carrying the sensor 303 and a second branch 345 carrying the latching system 342, these two branches 344, 345 being connected to one another by a third branch 346 called link branch.  The first 344 and the second 345 branches being folded on the same side relative to the connecting leg 346, the support 341 generally has a U-shape with a branch, namely that 345 carrying the latching system 342, shorter than the other branch 344 which is parallel to it.  In this embodiment the first leg 344 is configured to be received in the hollow leg 301.  The sensor 303 is implanted at the free end of the first branch 344 of the support 341.  The first branch 344 is in the form of a bar of rectangular section, which may be of square section.  The free end of the first leg 344 is chamfered, here rounded, as best seen in Figure 13a.  In addition at least two of the side edges of the first leg 344 are chamfered for insertion of the first leg 344 into the hollow leg 301.  The other two side edges of the first leg 344 may be chamfered so as not to damage the relevant coil.  [58] The electrical wires connecting the sensor to the power and control stage of the machine can be embedded in the first branch 344.  These wires are thus protected.  [59] The tab 301 exerts an elastic action against the first leg 344 of the support 341 of the sensor 303 so as to keep the sensor 303 in contact with the coil 19 and to prevent the movements of the sensor 303.  A resin material may be introduced into the housing 302 to improve heat transfer and electrical isolation between the sensor 303 and the coil.  This resin also fixes the first support branch 344 of the sensor 303.  [60] As shown in Figures 11a and 11b, the tab 301 has a substantially parallelepiped shape.  The tab 301 is thus delimited by an upper horizontal face 321 located substantially at the same level as the upper edge of the front flange 203 and a lower horizontal face 322 opposite.  The tab 301 also has two vertical faces 323 and 324 perpendicular to the front flange 203 and two other vertical faces 325 and 326 interconnecting the faces 323 and 324.  The housing 302 of the tab 301 is located on the side of the face 326.  [61] In one embodiment the lug 301 has a hole 331 adapted to receive a mounting tool 332 shown in Figures 12a and 12b for moving the lug 301 relative to the coil for the implantation of the first leg 344 of the support 341 of the temperature sensor 303 in the housing 302.  The tool may be a screwdriver or a blade as shown in these figures 12a and 12b.  The hole 331 which extends substantially parallel to the front edge 203 opens on the side of the upper horizontal face 321 of the tab 301.  This hole 331 is preferably blind to allow axial locking of the tool after insertion.  Alternatively the hole 331 may be through.  In FIGS. 12a and 12b, the arrows A and B respectively show the movements of the tool 332 during its insertion inside the hole 331 and during the spacing of the tab 301 to install the sensor 303 to the inside the dwelling 302.  [62] As seen in Figure 11b, the tab 301 is resiliently connected to the leading edge 203 by a strip 334 of reduced thickness material.  This strip 334 of material extends between the ends of the transverse edge of the front flange 203 and the vertical faces 323 and 324 of the tab 301 perpendicular to the front flange 203.  This strip 334 of material has a width substantially identical to that of the lug 301.  Thanks to this arrangement the tab 331 is flexible and exerts an elastic action against the sensor [63] Alternatively, to obtain the elastic effect, grooves 337 of shallow depth visible in particular in Figures 11a, 12a and 12b are formed around from the paw 301.  These grooves 337 are made along the vertical faces 323 and 324 perpendicular to the front flange 203 and along the lower horizontal face 322.  [64] In these Figures 11a, 12a and 12b there is also a strip of material as in Figure 11b.  This band of material is affected by the grooves 337.  [65] It will be appreciated that the strip of material makes it possible to reduce the axial size of the tab 331 relative to the flange 203, more precisely with respect to the upper transverse edge of the flange 203.  [066] Of course alternatively we can delete the material strip in Figures 11a, 12a, 12b due to the presence of the grooves 337.  Advantageously in this variant the tab 331 is connected to the upper transverse edge of the front flange by a rooting zone delimited by the two grooves 337 and of a thickness less than that of said transverse flange.  [067] In replacement or in addition to the hole 331, the tab 301 has a protuberance 338 shown in broken lines in Figure 11b to allow manual movement of the tab 301 for the implantation of the sensor 303 inside the housing 302.  In this figure the protuberance extends in axial projection with respect to the face 325 of the tab 301.  This protuberance may consist of a radial projection, such as a tongue 338 ', relative to the upper transverse edge of the front edge 203 as visible in Figure 10b.  This protuberance 338, 338 'may alternatively be perforated for the passage of the end of a hook for pulling the lug for setting up the support branch 344 of the sensor 303.  [68] In the embodiment of Figures 13a to 13b the latching system 342 for cooperating with the retaining member 361 comprises two portions 351 and 352 terminated by two flanges 353 and 354 projecting radially.  These portions 351, 352 are slightly spaced from one another to allow them to deform upon insertion within an opening 360 delimited by the holding member 361 carried by the interconnector 22.  For this purpose, the opening 360 has a dimension less than an external gap between the flanges 353 and 354.  The portions 351 and 352 have a chamfered end to facilitate their insertion inside the opening 360.  Once engaged inside the opening 360, the collars 352 and 354 axially retain the support 341.  The opening 360 preferably has an oblong shape to compensate for the different tolerances for mounting the interconnector 22 with the stator 11 and thus facilitate the fixing of the support 341 on the element 361 holding.  In this example, the holding element 361 is in the form of a projecting ear provided with the opening 360.  [69] The holding element 361 is in this molded embodiment with the body 38 of the interconnector 22.  This body 38 is preferably moldable plastic.  [070] In FIGS. 11a to 12b the hole 331 is configured to receive a tool.  Of course the tool may be constituted by the support 341.  [071] Thus, as is clearly visible in FIGS. 13b and 13c, a hole 331 'having a shape substantially identical to that of the hole 331 is used to receive the free end of the first branch 344 carrying the temperature sensor 303.  The hole 331 'can be blind or through.  For this purpose, the end of the leg 344 is preferably chamfered as shown in Fig. 13a to facilitate insertion of the sensor 303 into the hole 331 '.  The deformation of the tab 301 during the insertion of the branch 344 will ensure a good plating of the sensor 303 against the coil.  Note that the contact area between the sensor 303 and the tab 301 is substantially flat.  [72] In this embodiment, it is also possible to introduce resin into the hole 331 'in order to improve the thermal conductivity between the coil 19 and the sensor 303.  [73] The height of the assembly formed by the support and the sensor preferably does not exceed the height of the interconnector 22 so as to obtain a compact assembly.  [74] In a variant, the support 341 is fixed on a holding element coming from the outer periphery of the interconnector 22.  [75] The support 341 is made of electrically insulating material such as moldable plastic, preferably rigid.  It is the same for the element 361 come molded with the body of the connector 22 of plastic moldable.  The support 341 may be in PA 6. 6.  [76] An operation is described below to obtain the wound stator according to the invention connected to the interconnector 22.  [077] Initially, the coil insulators are positioned around an external tool.  The wire is then wrapped around the coil insulator within the groove.  Each coil insulator 20 is then removed from the tool and then threaded around a tooth 14 of the stator 11.  As shown in FIG. 2b, the heel 207 of each tooth 14 is then positioned so as to be pressed against the bottom of a notch 15 to effectively isolate the coils 19 from the yoke 17.  The fin 208 is folded toward the spool 19 so as to be held folded by a leading edge of an adjacent insulator.  The fin 208 thus constitutes an electrically insulating wall between two adjacent coils 19.  [078] The external interconnector 22 is then positioned above the coils 19 to provide a connection of the coils 19 to the various frames 31-34 of the phases U, V, W of the machine.  The interconnector 22 is positioned so that the feet 61 rest on a rim of the yoke 17 via the support 62 and that the indexing pins 53 fit between the corresponding protuberances 54 of the coil insulators 20.  [79] The interconnector 22 is then fixed on the stator 11 by welding the tabs 36 of the neutral frame 31 and phase frames 32-34 with the ends 191, 192 of the coils.  For this purpose, the inputs 191 of the coils 19 are alternately welded to the tabs 36 of the phase frames 32-34 corresponding to the phases U, V and W; while the outputs 192 of the coils 19 are soldered to the tabs 36 belonging to the neutral frame 31.  [80] An impregnation operation is then performed on the winding of the stator 11 by an impregnating varnish.  To this end, the stator 11 is heated as well as the varnish to be introduced in the liquid state drop by drop in the blind grooves 211.  The varnish is for example based on epoxy resin, unsaturated polyester resin or silicone resin.  Of course, in a known manner, it is possible to add accelerators to the resins in order to reduce the duration of the impregnation.  It will be noted that the blind grooves 211 of the lower and upper walls are spaced apart from each other as a function of the thickness of the yoke 17.  These grooves 43, not referenced in FIG. 2b, are not masked by the yoke 17.  [81] Alternatively, the impregnation operation may be performed by successive passage, following a rotational movement of the stator 11, the coils 19 inside a bath containing hot varnish.  Thus, alternatively, the impregnation operation may be carried out by partial soaking and rolling of the stator in a bath of impregnating varnish.  As a variant, the impregnation operation may be carried out under vacuum or by simply completely dipping the stator in an impregnating varnish bath.  In all cases the varnish is cooled by polymerizing.  [082] It is noted that the positioning of the interconnector 22 above the coils 19 and its reduced dimensions, in particular that of the outer diameter which is smaller than that of the stator 11, facilitates the passage of the impregnating varnish. outside the reels 19 via the grooves 211 blind.  [083] In a variant, the impregnation operation is carried out before soldering the interconnector 22 to the ends 191, 192 of the coils 19 of the stator 11.  [84] Preferably, the assembly formed by the stator 11 and the interconnector 22 is then mounted inside a housing by hooping, this housing may for example be cooled by water.  [85] In the embodiment of FIGS. 11 and 12, the tool 332 is inserted inside the hole 331 along arrow A.  With the end of the tool abutting against the bottom of the blind hole 331, the tool 332 is then inclined along the arrow B in a direction away from the interconnector 22 so as to move the tab 301 away from the the coil.  The first branch 334 for supporting the temperature sensor 303 is then implanted inside the housing 302.  The mounting tool 332 may take the form of an elongate rod having a shape complementary to the hole or a screwdriver.  [86] Where appropriate, the thermal conductivity enhancing resin is introduced into the housing 302.  Once the sensor 303 is positioned, the tool 332 is disengaged from the hole 331 so that the lug 301 elastically returns to its initial position so as to ensure a plating of the sensor 303 against the coil 19.  [87] In the embodiment of Figs. 13a to 13c, the chamfered free end of the first leg 344 carrying the sensor 303 is inserted into the hole 331 ', while the holder 341 is attached to the interconnector 22 by cooperating the latching system 342 with the holding member 361.  [88] For this purpose, the latching system 342 is inserted vertically within the oblong opening 360 via the portions 351 and 352 bevelled at their ends.  During insertion, the portions 351 and 352 move elastically closer to their initial configuration after the collars 352 and 354 have passed through the opening 360.  The support 341 of the sensor 303 is then held axially and radially by the holding element 361.  [089] The deformation of the tab 301 during the insertion of the end of the branch 344 ensures a good plating of the sensor 303 against the coil 19 in a substantially flat contact area.  The support 341 replaces the tool 332.  [90] In the embodiment of Fig. 10a the tab is manually peeled off with the protrusion to insert the first support leg 344 of the sensor 303.  [91] As is evident from the description and the drawings, the support 341 of the sensor 303 can be mounted before or after the impregnation operation for fixing the insulators 20 via the impregnating varnish on the teeth 14 and welding tabs 36 on the ends 191, 192 of the coils.  When the sensor support is mounted after the impregnation operation it is necessary to put a paper or shim in the housing 302, which is subsequently removed, so that this housing is not clogged with the varnish.  The flexible tab 301, movable manually or with the aid of a tool, which may be constituted by the support 341, is positioned between the two welding tabs 36 and the two ends 191, 192 concerned.  [92] In a variant, it will be possible to invert the structures, the flexible tab 301 being carried by the upper transverse border of the rear flange 204, whereas the holding element 361 is carried by the outer periphery of the interconnector 22.  The sensor may be put in place before welding the tabs 36 of the connector at the ends 191, 192 of the coil concerned and before the impregnation operation.  [93] Alternatively, the sensor may be put in place after the welding of the tabs 36 of the connector at the ends 191, 192 of the coil concerned and after the impregnation operation with the aforementioned introduction 25 of a paper or a shim that is then removed to house the branch 344 of the support 341.  [94] In Figures 13a to 13c the tab 301 is located between the two ends 191, 192 of the coil 19 concerned being centrally located with respect to the upper transverse border of the flange 30 before 203.  In a variant this lug 301 may be located centrally with respect to the upper transverse border of the rear rim 204.  It is the same with the latching system 361 vis-à-vis the tab 301 as visible in Figures 13b, 13c.  [95] Of course this tab 301 may be shifted circumferentially in one direction or the other.  It is the same with the latching system 361 vis-à-vis the tab 301 as visible in Figures 13b, 13c.  [96] The tab 301, alternatively, may be carried by the lower transverse border of the front flange 203 or the rear flange 204 centrally located with respect to this lower transverse border.

Of course this tab 301 may be shifted circumferentially in one direction or the other. It is the same with the latching system 361. [97] Of course the insulation may be devoid of tab 301. Thus, in another embodiment, the holding element 361, integrally molded with the body 38 of the interconnector 22 is shifted circumferentially so that the first leg 344 -and therefore the sensor 303- is implanted between the coil 19 and the fin 208 of the insulation 20 concerned. The first support leg 344 of the sensor 303 is pressed against the coil 19 via the flap 208 which thus has an additional function. The first leg 344 may be implanted adjacent to the front edge 203. Alternatively by inverting the structures, the first leg 344 may be implanted adjacent to the rear edge 204. [98] The rotating electrical machine may be configured to operate under two different voltages as described in document FR 2 918 512 to which reference will be made. In this case the connector may be a connection connector, such as a connection plate made of electrically insulating material bearing electrically conductive traces to ensure both the electrical connection between different strings of coils and the connection of these coil strings to two terminals to which the nominal voltage of the battery is applied as in Figures 7 to 12 of FR 2 918 512. The opening 360 is in this case made in the plate. [099] As is clear from the description and drawings, the fins 208, which constitute an electrically insulating wall between two consecutive coils 19 are derived from the insulator 20, here moldable plastic, so that the manufacture insulation 20, advantageously equipped with a heel 207, is easy. The mounting of the insulator 20 on its associated tooth 14 and the welding of the ends 191, 192 is also easy thanks to the configuration of the insulation 20 advantageously configured to guide the ends 191, 192 of the coil 19. The varnish impregnation allows a good fixing of the coil on its associated tooth 14 through the grooves 211, which are blind to avoid polluting the air gap between the stator and the rotor of the electric machine. The yoke 17 is in this embodiment of annular shape and is a support for the teeth 14 extending inward towards the axis X. The teeth 14 are distributed circumferentially in a regular manner and in known manner a gap exists between the free ends of the teeth 14 and the outer periphery of the rotor of the rotating electrical machine. This gap will not be polluted by the impregnating varnish. The heels 207 make it possible to increase the power of the electric machine. The fins 208 can also increase the power of the electric machine while making it more reliable and compact. It will be appreciated that the temperature sensor is used to interrupt the electrical circuit of coils in case of excessive temperature. This sensor, via the flexible and hollow tab 301, is positioned adjacent to the coil concerned. This optimum positioning is maintained during the life of the machine. The tab 301 prevents any movement of the sensor and provides a low volume housing to the sensor. The rotor of the electric machine may be a claw rotor as in the document FR 2 890 798. In a variant, the rotor may be at salient poles. Alternatively the rotor may be a rotor with permanent magnets as in EP 0 803 962 and EP 0 831 580 above. In a variant, the rotor with claws or with salient poles may also include permanent magnets. Alternatively the teeth 14 may not be distributed circumferentially in a regular manner. The skilled person can of course modify the configuration of the interconnector 22 previously described without departing from the scope of the invention. Thus, in particular, the stator 11 may alternatively present a quadriphase, pentaphase or even hexaphase winding. In this case, the interconnector 22 has respectively 5, 6, 7 frames stacked on each other, the outer frame constituting the neutral point. In the embodiment of Figure 9, the fin 208 is intended to be folded and left free. In this case, when the coil insulators are mounted on the teeth 14, the fin 208 of a given insulator 20 bears against a leading edge 203 of an adjacent coil insulator 20. The rotating electrical machine may belong to a motor vehicle and be in the aforementioned manner an alternator, an alternator-starter which is a reversible alternator, an electric motor or an electromagnetic retarder, such as that written in Figure 15 of the document FR 2 918 512. [0105] In the context of an alternator belonging to an extension extender of an electric vehicle (range-extender in English) the rotor may be a rotor with permanent magnets with several magnets per housing subjected to action of a spring as described in the application FR 12/54733 filed on 24/05/2012. It will be appreciated that this type of machine is reversible, compact axially while being of great power. Of course, the insulator 20, which is rigid here, may be alternatively devoid of fin and / or heel. The number of coils 19 depends on the applications and can therefore be less than or greater than 15. The number of insulators 20 equipped with tabs 301 can be greater than 1. Indeed for questions of standardization it may be desirable to have several insulators, see all the insulators, equipped with tabs 301 to be able to have several positions for the implantation of the support 341 of the sensor 303. Of course the connector 22 may have another form, for example the frames 31- 34 may be concentric. The rotary electrical machine may be of the type described in FIG. 16 of document FR 2 918 512. In this case, the plate carrying the voltage regulator or the rectifier bridge is provided with the holding element 361 to opening 360 for receiving the snap-on system of the support 341 of the sensor 303 The first leg 344 of the support 341 then passes through one of the air outlet openings of the housing or casing of the machine to fit between two consecutive coils. The holding element 361, for example in the form of a projecting lug, is then secured in an indirect manner to the stator concerned via the stator support housing. In the light of this document FR 2 918 512 it appears that the holding member may be constituted by the casing or housing of the electric machine having for this purpose the receiving opening of the latching system of the support 341 wherein the first support leg 344 of the sensor 303 passes through an opening of the housing. The holding element 361 is then integral with the stator indirectly. The first branch 344 may be positioned at the heads, also called bignons of a continuous wire stator winding such as that described in EP 0454 039. Alternatively the winding is 20 bars, such as pins described in EP 0 881 752. The first branch is then implanted at the level of the heads or welded portions of the pins. In both cases, the housing comprises at least one front flange and one rear flange, also called front bearing and rear bearing, and the holding element may be constituted by one of the flanges, the latching system 342 of the second one. branch 345 of the support 341 cooperating with an opening of the flange concerned. The opening of the holding element may be formed by means of an air passage opening formed in this flange for air circulation via an internal fan or the claw rotor. It is apparent from the description and the drawings that the holding element is integral with the stator 11, either directly, for example via the stator interconnector, or indirectly via the housing carrying the stator 11, or any other element integral with the housing such as one of the plates of FIG. 16 of document FR 2 918 512. The holding element is thus carried directly or indirectly by the stator. It will be appreciated that the sensor is well held in position by its support with two branches, one of which is fixed by snapping with the holding element. This sensor is well protected by means of its support, which cleans the coil concerned. The sensor-holder assembly is compact. It will be apparent from the description and the drawings that the first branch, in the aforementioned manner, can form a tool for moving the tab 301 away. As a variant, a tool is used to move the tab 301 away and mount the first leg 344. The size of the housing 302 therefore depends on the applications. The support 341 is of universal use and can be implanted between two coils 19 so that the presence of the tab 301 is not mandatory. The support can be mounted on a conventional electric machine and capture the temperature of a conventional stator winding. The stator may be an armature or an inductor.

Claims (19)

REVENDICATIONS1. Support (341) made of electrically insulating material for a stator temperature sensor (303) of a rotating electrical machine, characterized in that it comprises a first branch (344) carrying a sensor (303) and a second branch (345) carrying a latching system (342) intended to cooperate with a member (361) integral with the stator (11) of the rotary electrical machine, these two branches (344, 345) being connected to each other. another by a third branch (346) called the connecting branch. 2. Support (341) according to claim 1, characterized in that the sensor (303) is located at the free end of the first leg (344) of the support (341). 3. Support (341) according to claim 1 or 2, characterized in that the free end of the first leg (344) of the support (341) is chamfered. 4. Support (341) according to any one of the preceding claims, characterized in that the first leg (344) is of rectangular section. 5. Support (341) according to the preceding claim, characterized in that at least two of the side edges of the first leg (344) are chamfered. 6. Support (341) according to any one of the preceding claims, characterized in that the sensor (303) is fixed by overmolding 30 on the first branch (344). 7. Support (341) according to the preceding claim, characterized in that electrical son are connected to the sensor (303) and embedded in the first branch (344). 35 8. Support (341) according to any one of the preceding claims, characterized in that the first (344) and the second (345) branches are folded on the same side relative to the connecting branch (346) 9. Support (341) according to any one of the preceding claims, characterized in that it has generally a U-shape with a second branch (345) carrying the latching system (342), shorter than the first branch (344). 10. Support (341) according to any one of the preceding claims, characterized in that the latching system (342), intended to cooperate with the element (361) for holding, comprises two portions (351 and 352) completed by two collars (353 and 354) projecting radially and spaced from each other. 11. Support (341) according to the preceding claim, characterized in that the portions (351, 352) of the latching system (342) are slightly spaced apart from each other to allow their deformation during insertion to inside an opening (360) delimited by the holding member (361). 12. Rotating electrical machine, characterized in that it comprises a stator (11) and a holding element (361) integral with the stator (11) and provided with an opening (360) for cooperating with the latching system ( 342) of the support (341) according to any one of claims 1 to 11. 13. Machine according to claim 12, characterized in that the opening (360) is oblong. 30 14. Machine according to claims 12 or 13 taken in combination with claim 11, characterized in that the opening (360) has a dimension less than an external gap between the flanges (353 and 354) of the portions (351 and 352). . 35 Electric machine according to any one of claims 12 to 14, characterized in that it is of the polyphase type, in that its stator (11) comprises, on the one hand, a winding provided with a plurality of coils (19) and a neutral and on the other hand, a lnterconnecteur (22) comprising at least four frames (31-34) of annular shape stacked axially on each other and isolated from each other, each frame (31-34) bearing on its inner periphery tabs (36) projecting inwardly from the frame (31-34) for welding ends (191, 192) of coils (19) of the stator (11), and in that the interconnector (22) further comprises said holding member (361) for the temperature sensor (303) overmolded on a support (341) having a latching system (342) for cooperating with said holding member (361) provided with an opening (360) for this purpose. Electric machine according to one of claims 10 to 15, characterized in that its stator (11) comprises teeth (14), a winding having a plurality of coils (19) and at least one coil insulator (20). in that said coil insulator has a body (201) having frame walls (202) and a front flange (203) and a rear flange (204) defining with a frame walls (202) a groove assembly for winding a coil (19), and in that said coil insulator comprises a hollow flexible lug (301) carried by one of the flanges of the coil insulator, said lug (301) delimiting a housing (302, 331 ') for receiving the first leg (344) of the support (341) of the temperature sensor (303). 17. Machine according to the preceding claim, characterized in that the tab (301) exerts an elastic action against the first leg (344) of the temperature sensor (303) so as to maintain contact with the coil. 18. Electrical machine according to claim 16 or 17, characterized in that the tab (301) is elastically connected to the flange (203, 204) by a strip (334) of material of reduced thickness. 19. Electrical machine according to any one of claims 16 to 18, characterized in that grooves (337) are formed around the lapatte (301). 10 15 20 25 30 35