Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
  • H02K49/02—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type
  • H02K49/04—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type
  • H02K49/043—Dynamo-electric clutches; Dynamo-electric brakes of the asynchronous induction type of the eddy-current hysteresis type with a radial airgap
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
  • H02K11/04—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for rectification
  • H02K11/042—Rectifiers associated with rotating parts, e.g. rotor cores or rotary shafts
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/20—Structural association with auxiliary dynamo-electric machines, e.g. with electric starter motors or exciters
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
  • H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
  • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
  • H02K7/11—Structural association with clutches, brakes, gears, pulleys or mechanical starters with dynamo-electric clutches
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K9/00—Arrangements for cooling or ventilating
  • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
  • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
  • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

Definitions

• the present invention relates to an arrangement of at least one electronic circuit in a rotating electrical machine such as an electromagnetic retarder, and a rotating electrical machine comprising such an arrangement.
• Rotating electrical machines for example electromagnetic motors, comprise means for creating a stream of a gaseous fluid, typically a stream of air, for cooling the induction coils arranged in a ring on a rotor of the electric machine and inside a stator that surrounds the rotor.
• the stator is intended to be mounted on a chassis of a vehicle.
• One of the cooling means is a fan described for example in EP-A-0331559 and FR-A-1467310 (US-A-3 416 016).
• the fan is often also used to cool other heating elements, for example electronic circuits. Some units have two fans; they are usually hooked to a retarder tree.
• the fan when When the retarder starts to operate, the fan (s) create a flow of air flowing to the retarder coils and to the electronic circuits to cool them. This cooling makes it possible to avoid a fall in performance of the hot retarder. Overall, a fan helps create up to ten percent of the total retarding torque generated by the retarder.
• the inductor rotor is powered by a generator, for example a three-phase generator, through one or more rotating diode bridges.
• the diode bridges mounted on radiators to ensure their cooling, are placed in a zone through which a cooling gaseous fluid is conveyed by means of the fan or fans of the retarder.
• the electromagnetic slow-downs comprise, as described for example in documents FR-AI 467 730, EP-BO 331 559 and FR-A-2,814,003, a wound inductor rotor and a current generator provided with a supply rotor for supplying direct current to the coils of the inductor rotor via a DC rectifier device with rectifying components.
• the rectifying device is a rectifier bridge carrying rectifying components in the form of diodes mounted in pairs, a diode of one pair being connected to ground and the other diode of this pair to a supply line of the coils of the inductor rotor.
• the diodes 55 of the rectifier bridge are mounted in a support 56 integral with the front face of the inductor rotor of the retarder (FIG. 1 of the document) so that the diodes are implanted in a hot region, knowing that the coils of the inductor rotor can reach temperatures of the order of 200 ° C.
• the current rectifier bridge is located in the vicinity of the coils of the rotor inducer of the retarder, so that it is implanted also in a hot region.
• the diodes 18 of the rectifier bridge are mounted on a web 20 forming a flange for fastening to a plate secured to the output shaft of the gearbox so that that the diodes are implanted in a region with high mechanical stress.
• the diodes are implanted at the inner periphery of the inductor rotor on the opposite side to the current generator so that the electrical connections between the diodes and the rotor of the generator are of great length. and that the diodes are implanted in a region of high heat.
• the diode bridges are cooled with an already hot gaseous fluid, since having passed in front of the induction coils of the rotor. If, in addition, the retarder is equipped with a disengageable fan, the diode bridges may not be sufficiently cooled during and especially after use of the retarder.
• the object of the invention is to overcome the various disadvantages mentioned above.
• the invention must propose a solution that makes it possible, if possible, to optimize the mounting of one or more electronic circuits in a retarder, in particular components of the current rectifier, such as diodes or transistors. of the MOSFET type.
• the invention must propose a solution which makes it possible to ensure a better cooling of one or more electronic circuits, hereinafter also briefly referred to as "electronics", of a rotary electrical machine, for example of an electromagnetic retarder, and to reduce the temperature of the components of the electronics, and this with simple, robust, and space-saving means and which, when the solution had to comprise additional parts compared to the fans used before the invention, allows them to be housed inside the electrical machine so that they do not contribute to an increase in the size of the electric machine, especially when it is a question of electromagnetic retarder.
• the object of the invention is achieved with an arrangement of an electronic circuit in a rotating electrical machine, such as an electromagnetic retarder, comprising a wound inductor rotor and a current generator provided with a feed rotor for electrically feeding. the inductor rotor coiled via the electronic circuit.
• the electronic circuit is mounted axially adjacent to the feed rotor forming a unitary assembly with the body of the feed rotor.
• the adverb "axially” is used here as opposed to the adverb "laterally” and must express that the electronic circuit is disposed substantially within a dummy cylindrical envelope surrounding the feed rotor.
• Another advantage is that the or each of the electronic circuits is close to the supply rotor of the current generator while being implanted in an area not dedicated to a connection in rotation with the retarder shaft, so that this area is less mechanically stressed.
• the electronics of the rotating electrical machine is located in a cooler zone than that of the wound rotor.
• This body provides a good support surface for the electronic circuit and is remote from the wound rotor of the transmitter.
• This solution also makes it possible to implant a fan between the wound inductor rotor and the supply rotor.
• the electric machine is an electromagnetic retarder comprising a wound inductor rotor and a current generator provided with a supply rotor for electrically feeding the wound inductor rotor via a rectifying component current rectifying device
• the electronic circuit is a rectification device mounted axially adjacent the supply rotor forming a unitary assembly with the body of the supply rotor.
• the invention therefore proposes in a first embodiment to arrange the electronics, that is to say the electronic circuit or circuits, in a position axially adjacent to the supply rotor and thus in the front part of the reactor, seen in the direction of the flow of the cooling gaseous fluid, that is to say directly at the inlet gaseous fluid in the space to be cooled, even before the location where an axial-acting fan is located in the reamers used prior to the invention.
• the layout of the electronics in front of an electromagnetic retarder cleverly uses the retarder design.
• the retarder comprises a rotating shaft for attachment to a main or secondary output shaft of a gearbox, to an input shaft of a rear axle of a motor vehicle, to a rear axle of a trailer or a semi-trailer or a gearbox with multiplication of speed, and a rotor integral in rotation with the rotating shaft, induction coils arranged in a ring on the rotor and inside a stator surrounding the rotor and intended to be mounted on a chassis of the vehicle, a generator mounted on one end of the rotary shaft of the rotor and supplying the induction coils, and an axial-acting fan for introducing a cooling gaseous fluid to the inside the retarder and to circulate it on induction coils and electronics.
• the output of the gaseous fluid is assisted by means giving the flow of the gaseous fluid a transverse orientation with respect to the axis of the retarder.
• the invention instead of cooling the electronics, as before the invention, by a gaseous fluid already heated, since passed in front of the induction coils, the invention therefore has the electronics in a place where the gaseous fluid is not yet heated, that is to say before the induction coils.
• the invention thus makes it possible to increase the performance and reliability of the retarder by better controlling the cooling of the electronics.
• the solution that the invention proposes is simple to integrate into the design of a retarder, is not bulky, is lightweight and very economical.
• the invention also relates to the following features considered in isolation or in any technically possible combination:
• the or each of the electronic circuits is arranged, seen in the direction of the flow of cooling gaseous fluid, alternately at the front or at the rear of the generator rotor of the rotating electrical machine;
• the or each electronic circuit is disposed inside the body of the rotor of the generator of the rotating electrical machine, that is to say, it is or they are implanted in the thickness of the body of the power rotor; the or each of the electronic circuits is integral with the body of the supply rotor;
• the electronic circuit is a current rectifier device comprising two radiators, respectively a negative radiator intended to be connected to ground and a positive radiator electrically isolated from the body of the supply rotor;
• the electronic circuit is mounted on one or more supports forming one or more radiators, the or each radiator being provided with striations for increase the exchange surface;
• the negative radiator is also electrically insulated with respect to the body of the supply rotor when the latter must not be connected to ground;
• radiators are made of metal to better evacuate the heat
• the diodes are mounted by force-fitting in the radiators and comprise for this purpose a knurled body;
• the diodes are reported by brazing on the radiators;
• the radiators are provided with radial fins or radial ribs to both increase the heat dissipation and to channel the flow of a gaseous cooling fluid, the radiators thus forming a radially-acting fan;
• the body of the feed rotor is mechanically connected to the body of the stator wound by tie rods;
• the generator stator cover forming a protective cover, is centrally perforated to channel the flow of a gaseous cooling fluid, generally air, licking the radiators (ribs or finned) components of the electronic circuit for example a current rectifying circuit; the circulation of the gaseous cooling fluid is caused by a fan of larger diameter than that of the body of the supply rotor; thanks to this arrangement, the bunks of the feed rotor of the generator are well cooled; the electronic circuit is fixed by means of an insulating support;
• the insulating support has at its outer periphery ears for attachment to the body of the supply rotor;
• the electronic circuit is located below the winding that includes the feed rotor.
• the number of components of the electronic circuit or circuits depends on the number of phases of the generator.
• the generator is of the three-phase type.
• the generator may have 5, 6 or 7 phases.
• the body of the feed rotor like the body of the wound rotor, is a rotor with salient poles.
• this body is grooved for assembling windings with at least two stages, as described in document FR A 1 467 730.
• the object of the invention is also achieved with an electromagnetic retarder in which the electronics is arranged as described above.
• FIG. 1 is a perspective view, with local tearing, an electromagnetic retarder comprising several fans mounted on a rotating shaft of the retarder secured to a gearbox output shaft,
• FIG. 2 is a perspective view, with local cutaway, of one of the two ends of a retarder of the invention, which comprises an arrangement of electronic circuits according to a preferred embodiment of the invention
• FIG. 3 is a perspective view, with local cutaway, of the retarder of FIG. 2, shown with a view of the other of the two ends of the retarder and a representation of the cooling flow
• FIG. 4 is a perspective view, with FIG. 5 is an axial sectional view of the retarder of FIG. 2, showing the arrangement of electronic circuits according to FIG. the invention and the flow of a gaseous cooling fluid through the retarder of FIG. 1;
• FIG. 6 is a perspective view of the insulating support of the radiators of the rectifier bridge, and
• FIG. 7 is a perspective view of the current rectifier bridge radiators equipped with diodes.
• Figure 1 recalls the general structure of an electromagnetic retarder with two fans mounted on a rotating shaft of the retarder.
• the electromagnetic retarder is shown in a perspective view with axial partial section and as being mounted on a gearbox 105 of a motor vehicle.
• This retarder is intended to slow down a transmission shaft of the vehicle and more particularly here the output shaft of the gearbox 105, here via a speed multiplier described for example in the document FR-A-2861912 to which reference will be made.
• the retarder generates an alternately distributed magnetic field in an internal ferromagnetic part 121 of a stator 110, which also comprises a cooling jacket 103 in a helical form in a single turn.
• the jacket 103 is provided with an intake duct C and a discharge duct D.
• the jacket 103 delimits, with the inner part 121, a chamber inside which a cooling fluid circulates, here the the engine of the vehicle.
• the retarder comprises a rotating shaft 102 hooked on the output shaft, here a secondary output shaft, the gearbox 105 and an inductor rotor 101 integral in rotation with the rotating shaft 102.
• Induction coils 107 are arranged in a ring on the rotor 101 and inside the stator 110 surrounding the rotor 101.
• the stator 110 which comprises the cooling water jacket 103 and the inner part 121, is intended to be mounted on a chassis of the vehicle.
• the retarder also comprises a current generator 106, here of the three-phase type, mounted on one end of the rotating shaft 102 of the rotor 101, a rotor 124 (see FIGS.
• the fan 109A is axially acting while the fan 108 is radially acting, c ' that is to say centrifugal type, the blades of these two fans being configured accordingly.
• the fan 109A is disengageable in this embodiment.
• the generator 106 provides the excitation energy necessary to generate the alternating distribution magnetic field.
• This generator 106 comprises an inductor stator 114 formed in the exemplary embodiment by a ring of coils or windings 104 of electrical wires around cores constituting multiple magnetic poles with alternating polarities, and the induced rotor 124 constituting a feed rotor for the rotor 101 with coils 107.
• This supply-induced rotor 124 comprises a body 214 (FIGS. 4 and 5), here in the form of a bundle of sheets, as can be seen in FIGS. 2 and 3. This body carries in a embodiment of the cores for mounting induced coils so that the rotor 124 is at salient poles.
• this body is provided with grooves for mounting coils or windings for example two stages as described in document FR-A-1 467 730.
• the feed rotor 124 therefore comprises a winding comprising coils or windings.
• a gaseous fluid, such as air can pass through the winding in all cases.
• the stator 114 may comprise alternatively a body is provided with grooves for mounting coils or windings, for example two-stage as described in document FR-AI 467 730 allowing the passage of a gaseous fluid, such as 1 air.
• a gaseous fluid such as 1 air.
• Figure 2 there is not shown the rotor winding 124, visible in Figure 5, to see better the groove body of the rotor 124, which is connected to the body of the rotor 101 by tie rods.
• the inductor stator 114 also includes a body 215 (Figs. 4 and 5) carrying coil-mounting cores 104, as previously mentioned.
• the inductor stator therefore also comprises a winding.
• the coils 104 are electrically interconnected and constitute the winding of the inductor stator 114.
• the winding of the inductor stator and the winding of the supply rotor extends on either side of the body, respectively of the inductor stator and the feed rotor, to form projecting buns.
• the grooves of the bodies are advantageously of the semi-closed type. 300 is shown in FIG. 4 one of the grooves of the body 214 of the rotor 401 and the rear ends of the tie rods connecting the body 214 to the body of the rotor 101 with the presence of a spacer 209 between the two bodies as described below.
• the front ends of the tie rods are visible in FIG. 2, one of them being identified by the reference 402.
• the inductor stator 114 surrounds the induced rotor 124 with a small gap.
• a rectifier bridge 201 is interposed between the induced rotor of the generator 106 and the coils 107 of the rotor 101, as described in the documents EP-A-0331559 and FR-A-1467310.
• stator coils 104 When the stator coils 104 are electrically powered by a DC power source such as a battery of the vehicle equipped with the power. The intensity of this current is adjusted according to the resistant resisting torque that the retarder must produce. Indeed, by adjusting the intensity of the induction current of the coils 104 of the stator 114, the intensity of the electric current generated by the induced rotor of the generator 106 is regulated and, finally, the intensity of the eddy currents generators of the retarding and heating resistant torque generated in the ferromagnetic part 121 of the stator 110 of the retarder.
• Generating the power supply current required for the generation of eddy currents by a generator 106 integrated in the retarder provides a double advantage.
• the first advantage consists of a very low external electrical energy input taken from the vehicle battery, for example of the order of 20 to 30% of the total energy required.
• the second advantage is that the generation of electric current by the generator itself consumes some mechanical energy taken from the tree to slow down.
• the excitation current generated by the winding of the induced rotor 124 of the generator 106 feeds the induction coils 107 of the rotor 101 of the retarder to generate a magnetic field.
• the coils 107 are formed by windings of electrical wires around cores forming integral parts of the rotor 101.
• the cores belong to the body of the rotor 101 made of ferromagnetic material and form salient poles.
• the magnetic field induces the stator 110 of the retarder and generates eddy currents therein, in particular in the inner part 121 of the stator 110 made of a ferromagnetic material.
• the eddy currents being opposed, by their effects, to the cause that gives them the meaning, namely the rotational movement of the rotor, the rotational movement of the rotor 101 thus generates a reverse torque, thus a slow-down torque. of the shaft 102.
• the body of the rotor 101 is made of ferromagnetic material and here consists of a package of sheets.
• the fan 109A has blades whose feet are anchored in a sleeve 111 inside which is mounted a bearing, here a ball bearing (not visible), intervening between the outer periphery of the shaft 102 and the inner periphery of the sleeve 111.
• the heads of the blades are anchored in an outer peripheral ring 119.
• the fan 109A and the sleeve 111 are interposed between the two rotors 101, 124.
• the fan 109A is a disengageable fan. This fan is engaged when the coils 107 are electrically powered, that is to say when the retarder operates. The fan is disengaged, being free in rotation by the aforementioned bearing, when the retarder does not work, that is to say when the coils 107 are not electrically powered.
• the fan 109A carries a ring 112 of ferromagnetic material, which extends below the heads of the coils 107.
• a magnetic field is generated that allows a magnetic loop with the 112.
• This looping rotates the fan 109A axial action which rotates with the stator 110 and the shaft 102 of the retarder.
• the fan is then engaged; otherwise it is disengaged and does not rotate with stator 110 and shaft 102.
• Fan 109A is small in size axial and allows to reduce the no-load losses and the consumption of a torque on the shaft 102 during periods of non-use of the rrs is seur.
• the end of the retarder through which the air enters the retarder here constituted by the perforated cover 113
• the front of the retarder and the opposite end, here constituted by the perforated support 314, is called the back of the retarder.
• the cover 113 and the support 114 are fixed for example by screwing on the cooling jacket of the retarder.
• FIG. 2 is a perspective view, locally cut away, of the front of a retarder according to the invention with a fan 109 not disengageable.
• This figure shows more particularly an arrangement of electronic circuits, here a rectifier bridge 201 of alternating current in direct current, for supplying DC current to the coils 104 of the stator 114 of the generator 106, according to the preferred embodiment of the invention.
• the body of the rotor 101 internally has arms for mounting on the shaft 102 and is traversed by the tie rods connecting the body of the feed rotor 124.
• the ends 402, 401 of these tie rods are located generally centrally relative to the rotor body 11.
• the arms of this body are here assembled by rivets visible in Figures 4 and 5.
• the tie rods are also used to assemble the sheets of the body of the rotor 101 in connection with the spacer 209 A space exists in favor of the tie rods between the two rotors 124, 101, more precisely between the bodies thereof.
• the fan 109 here axially acting, is implanted between these two bodies being integral with the shaft 102.
• the present invention proposes to arrange the electronics, that is to say the electronic circuit (s), of the retarder in a position adjacent to the induced supply rotor 124 and thus in the front part of the colder retarder. .
• the electronics form a unitary assembly with the body of the supply rotor.
• the electronics is secured to the body of the feed rotor as described below.
• the rectifier bridge 201 is, in FIGS. 2 to 5, mounted on a disk-shaped support 202 which is disposed at the front of the generator 106 and comprises a central return 203 and an external peripheral (see FIG. 4) as well as ears 302 for mounting just behind the perforated cover 113, here hollow to form a protective cover.
• the central and peripheral returns are of axial orientation with respect to the axis of the shaft 102. These returns delimit a blind cavity whose bottom is constituted by the disk of the support. The cavity is located inside the body of the feed rotor 124.
• the support 202 is made of electrically insulating material, here made of plastic material.
• This support 202 in hollow form, has at its outer periphery four perforated ears 302 (see FIG. FIG. 6) for its fixing by means of fasteners, such as screws or rivets, on the body of the induced rotor 124 and thus forming a unitary assembly, which is manipulable and transportable.
• the bridge 201 is remote from the rotor 101.
• the rectifier bridge 201 is implanted in a cold region below the grooves of the body of the supply rotor 124 and therefore of the winding of this rotor
• the ears 302 are angularly distributed at 90 ° to each other. Two of these diametrically opposite lugs 302 are extended radially inwards by separating ribs 303. These ribs 303 serve for the separation of the two radiators 304, 305 (see FIG. 7) that the rectifying bridge 201 presents.
• the ribs stiffen the support 202.
• the fixing of the bridge on the rotor body 124 is robust
• the radiators 304, 305 are metallic and each extend generally 180 ° as visible in Figure 7. They include notches for the passage of the attachment lugs 302.
• Radiators 304, 305, forming heat sinks are each fixed on the front face of the insulating support 202, stiffened by its flanges, for example by means of screws or rivets not shown.
• the fastening is made by overmoulding
• the radiators 304, 305 are in contact with the front face of the support 202 belonging to the disk thereof. Radiators 304, 305 carry each of the current rectifying elements, here in the form of diodes.
• the tails of the diodes are mounted in the cavity defined by the central and peripheral returns and thus are well protected and remote from the rotor winding 124.
• the rectifier bridge 201 comprises branches, here four branches, each comprising two diodes connected in series between the ground and a supply line of the coils 107 as visible for example in the documents FR-AI 467 310 and EP-B-0 331 559. Compared to these two documents, there are six diodes and two additional diodes, called freewheeling. The six diodes are mounted in pairs at the rate of two diodes per branch.
• One of the radiators for example the radiator 304, carries the so-called negative diodes, intended to be connected to ground, and the other of the radiators, therefore the radiator 305, carries the other diodes, that is to say the so-called positive diodes.
• the diodes have a knurled body, for a press fit in the radiator concerned 304, 305, and an axially oriented tail (see Figure 4).
• the tails of the diodes pass through the support disk which carries, at its rear face, metal traces (not shown) for interconnecting the diodes.
• the knurled body of the diodes can also be used for fixing the disk of the support by press fit. It will be appreciated that the connection between the tails of the diodes and the coils 107 of the rotor 101 is short.
• the lid 113 of hollow form has a disc portion 115, essentially flat orientation transverse relative to the axis of the shaft 102, an outer rim 116, directed towards the rear of the retarder and a recess or central return 117, also directed towards the rear of the retarder and contributing to form a front bearing for l rotating shaft 102. While the disc portion 115 and the rim 116 are fully closed, the recess 117 is provided with inlet openings 118 distributed in a ring around the opening of the cover 113 allowing access to a gaseous fluid cooling inside the retarder. More specifically, the recess has at its inner periphery a bushing, as can be seen in FIGS. 4 and 5.
• a bearing such as a ball bearing 301, is interposed radially between the outer periphery of the front end of the bushing. shaft 102 and the inner periphery of the socket of the depression, which thus has a dual function.
• a rounded zone connects the outer periphery of the disc portion 115 to the flange 116 of axial orientation with respect to the axis of the shaft 102.
• This flange 116 internally carries the body 215 of the inductor stator and thus the inductor stator.
• the depression 107 has a curved portion for its connection respectively to the inner periphery of the disc portion 115 and its axially oriented sleeve relative to the axis of the shaft 102.
• the gills 118 are formed in major part this zone. rounded.
• the shaft 102 has a fluted rear end (see FIGS. 3 to 5) for complementary engagement with a fluted internal bore provided by a gear belonging to a speed multiplier mentioned above between the shaft 102 and a secondary shaft of the gearbox connected to the main output shaft of the gearbox. Slowing the shaft 102 causes a slowing of the secondary and main shafts of the gearbox and thus a slowing down of the motor vehicle.
• each radiator 304, 305 of the rectifier bridge 201 is provided with fins or ribs 204 arranged radially around the central opening of the support.
• each radiator forms a radially-acting fan guiding the gaseous fluid, here air, entering through the inlet openings 118, along the radiators of the rectifier bridge 201 to cool them, before the rim 116 of the perforated cover 113 directs the gaseous fluid to the coils 104 of the stator 114 of the generator 106 and then, in favor of the spaces existing between the coils 104, towards the interior of the slow speed.
• Each diode body is implanted between two ribs 204 and is well cooled.
• the axial inlet and the radial distribution of the flow of cooling gaseous fluid are indicated in FIGS. 2, 3 and 5 by straight and curved arrows.
• the fan 109 allows a circulation gaseous fluid.
• the rectifier bridge 201 is implanted radially inside the winding 425 of the feed rotor 124 and also, as better visible in FIG. 2, at least substantially radially below the ends. 402 tie rods.
• the tails of the diodes are implanted, as can be seen in FIGS. 4 and 5, in the radial space delimited by the internal periphery of the body 214 of the rotor 124 and by the socket of the depression 107.
• Fixing the bridge rectifier on the body 214 is robust. This robustness is due in particular to the support 202 stiffened by the ribs 303 and the flange 203 of axial orientation that it has at its inner periphery.
• the support 202 with the rectifier bridge 201 may also be mounted at the rear of the generator supply rotor, or inside the rotor body of the generator of the rotating electrical machine.
• the rectifier bridge is implanted in the thickness of the body of the supply rotor.
• the diodes consist in this case in parts devoid of orientation tails.
• the flow of cooling gaseous fluid first meets the radiators of the rectifier bridge 201 and its support 202 and the cools before entering the retarder to cool the induction coils 107 of the retarder rotor.
• the face of the radiators of the rectifying bridge 201 which is exposed to the flow of gaseous fluid may be provided with ridges for increasing the exchange surface.
• Figure 3 is a perspective view, locally broken away, of the retarder of Figure 2, with a view of the rear end of the retarder and representation of the flow of gaseous cooling fluid within the retarder.
• the supply rotor 124 of the generator and the rectifier bridge (not visible here), then, in the axial assembly order, the axial-action fan 109 and the rotor 101 with the induction coils 107 surrounded by the stator 110 of the retarder and in particular the cooling jacket 103.
• the flow of gaseous cooling fluid passes through the coils 104 of the stator 114 of the generator 106 and is then accelerated by the fan 109 through the induction coils 107 of the retarder rotor.
• the cooling gaseous fluid successively cools, on its path in the form of a cylindrical envelope, the coils 104 of the generator 106 with the rectifier bridge 201, and the induction coils 107 before leaving the inside of the retarder by the gills.
• the output of the support 114 Note that the outer ring 119 of the fan extends above the air gap between the stator windings 104 and the rotor winding of the generator 106 (see FIGS. 4 and 5).
• Figure 4 is a perspective view, with axial section, of the retarder of Figure 2, with a view of the rear end of the retarder.
• the perforated cover 113 At the inlet of the retarder, there is found the perforated cover 113 and then, in the axial assembly order, the rectifier bridge 201 with its support 202, the rotor of the generator 106 with its coils, the fan axial action 109 and the rotor with the induction coils 107 surrounded by the stator 110 of the retarder and in particular the cooling jacket 103.
• FIG. 4 shows more particularly the shape of the depression 117 of the perforated cover 113 and the shape of the central return 203 of the support 202 of the rectifying bridge 201.
• the depression 117 forms, with a bearing ring 301, the front bearing of the rotating shaft 102 of the retarder.
• the shapes of the central return 203 and the recess 117 allow a compact arrangement of the rectifier bridge 201 and the generator supply rotor 106 while creating an optimal path, and particularly effective for cooling the rectifier bridges. 201, for the passage of cooled gaseous fluid.
• FIG. 5 is a view in axial section of the retarder of FIG. 2, showing the arrangement of electronic circuits according to the invention and the flow of a gaseous cooling fluid through the retarder of FIG.
• the number of struts is in one embodiment equal to the number of tie rods, as a variant less than the number of tie rods.
• the spacers are for example of tubular form. This makes it possible to reduce the heat transfer between the two rotors 101, 124. In a variant, the spacer is of annular shape, possibly divided into several parts.
• Figure 5 shows more particularly the flow of a gaseous fluid cooling through the retarder and in particular before the support 202 of the rectifier bridge 201 to cool first.
• the gaseous fluid generally air, arrives at the cover 113 and enters the retarder through the inlet openings 118 of the cover 113, that is to say in the form of as many partial flows as the cover 113.
• Each of the partial flows enters the retarder with a non-axial orientation, essentially determined by the arrangement of the inlet lug 118 corresponding in the curved portion of the depression 117 of the lid 113.
• the set of partial flows form a cooling jacket for the generator 106 and the rectifier bridge 201 as well as a cylindrical flow of cooling passing axially through the induction coils 107 of the rotor of the slow speed.
• the merit of the invention which consists in arranging the electronics of the reactor, here the rectifier bridge 201 with its radiators and their support 202, in front of the reactor, adjacent to the rotor supplying the generator 106 of the retarder so that the cooling gaseous fluid first passes the rectifier bridges 201 to cool them before entering the interior of the retarder rotor to cool the induction coils 107 therein.
• non-disengageable fan 109 can be replaced by a disengageable fan 109A, with the crown 112, at least two stages to improve the performance of the fan and reduce the no-load losses.
• a fan facilitates cooling of the coils, while limiting the consumption of a torque on the shaft, especially during periods of non-use of the retarder.
• such a fan comprises a hub and at least two sets of blades arranged radially around the hub.
• the first set of blades is arranged directly around the hub and forms a first stage of the fan, and the one or more sets of blades are arranged around the first set of blades and successively form, towards the outside of the fan, a second stage, a third floor etc. of the fan, each stage having a number of blades greater than that of the lower stage.
• the design of a fan with at least two floors also makes it possible to optimize the fan performance by varying the inclination of the blades from the center to the periphery.
• the invention provides a solution for improving the performance of the rseurseur, including reducing losses without a vacuum.
• the invention facilitates the cooling of the electronics of the generator, while limiting the consumption of a torque on the shaft, especially during periods of non-use of the speed controller.
• the rear fan 108 may be replaced by a baffle.
• Two current rectifier bridges can be provided when the rotor winding is of the double three-phase type.
• the rotor 101 may have only one coil being a claw rotor as in Figure 4 of the document FR A 2,814,003 supra.
• the stator of the retarder may alternatively be cooled by circulation of air.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
• Motor Or Generator Cooling System (AREA)
• Synchronous Machinery (AREA)

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• 2006
  • 2006-08-10 FR FR0653347A patent/FR2904896A1/fr active Pending
• 2007
  • 2007-08-06 EP EP07823692A patent/EP2050180A2/de not_active Withdrawn
  • 2007-08-06 WO PCT/FR2007/051785 patent/WO2008017785A2/fr not_active Ceased

Non-Patent Citations (1)

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