EP1627151B1 - Lüfter für einen wechselstromgenerator - Google Patents

Lüfter für einen wechselstromgenerator Download PDF

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Publication number
EP1627151B1
EP1627151B1 EP04742729.9A EP04742729A EP1627151B1 EP 1627151 B1 EP1627151 B1 EP 1627151B1 EP 04742729 A EP04742729 A EP 04742729A EP 1627151 B1 EP1627151 B1 EP 1627151B1
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EP
European Patent Office
Prior art keywords
fans
fixing
blades
fan
spot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP04742729.9A
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English (en)
French (fr)
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EP1627151A1 (de
Inventor
Claudiu Vasilescu
Richard Tellier
Nam-Gook Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valeo Equipements Electriques Moteur SAS
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Valeo Equipements Electriques Moteur SAS
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Publication of EP1627151A1 publication Critical patent/EP1627151A1/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers

Definitions

  • the present invention relates to a ventilation device for a rotating electrical machine, especially for a motor vehicle.
  • Such a machine may be an alternator or a starter-alternator for a motor vehicle, or another type of rotary electric machine, and is described for example in the documents FR-A-2602925 and JP-A-6121497 , the content of which we can refer for more details.
  • This machine comprises a hollow support for fixing the machine on a fixed part, a stator and a rotor carrying at least one ventilation device.
  • the stator surrounds the rotor, which is integral with a rotor shaft.
  • the carrier carries, at its outer periphery, the stator and centrally bearings, such as bearings with one or two rows of balls, for rotatably mounting the rotor shaft so that the rotor and the stator are mounted to the rotor.
  • interior of the support comprising two parts called front bearing and rear bearing.
  • the rotor and / or the stator comprise at least one winding so that, in operation, the machine heats. Frictions mechanicals also occur in operation. This friction contributes to the heating of the machine.
  • the machine In some applications, particularly when it is an alternator or a starter-alternator for a motor vehicle, the machine carries electronic components that must be protected against overheating to prevent their destruction.
  • a cooling fluid generally air
  • This fan comprises a central flange from which a series of fan blades extend radially outwardly and projecting axially.
  • This type of ventilation device gives satisfaction, nevertheless in some cases it can be difficult to obtain a large number of blades of the desired shape.
  • At least between two consecutive blades of one of the fans is implanted at least one blade of the other fan and the blades are each connected to a peripheral branch that has each flange at its outer periphery.
  • the blades are thus carried by the branches.
  • the central flanges are superimposed and adjacent and their fixing means consist of one or more series of attachment points, consisting of welding points, which are for example arranged in a circle (s) and which are distributed on the surface of the two superimposed flanges which are of generally annular shape.
  • This attachment is for example provided by means of a series of attachment points, such as welding points, between one of the flanges and the rotor.
  • the invention proposes a device of the type mentioned above, characterized by the characterizing part of claim 1.
  • branches are configured so that they have overlapping areas, which in combination with the attachment points make it possible to stiffen the ventilation device while having room at the central annular portion of the flanges for attachment to the rotor.
  • At least one of these branches carries a blade which allows to have the number and / or size of the desired blades.
  • each branch carries a blade.
  • Balancing means are therefore located in the vicinity of the fastening means of the branches of the fans.
  • one of the fans may be in several parts and that one of the fans may comprise a metal insert and blades with stiffened plastic branches by virtue of the overlapping zones and the fixing points. .
  • the fastening means of the two fans comprise for example at least one point for fixing the overlapping portions of the two branches.
  • the aforementioned balancing means are located in the vicinity of this point of attachment.
  • the fixing point is made by welding or gluing.
  • the fixing point is made by riveting, in particular by extrusion to reduce the number of parts.
  • the fixing point is made by clinching.
  • said fixing means comprise two attachment points of the overlapping portions of the two branches, which are in particular arranged in the vicinity of opposite ends of the two cover portions to give the greatest possible rigidity to the ventilation device.
  • the fixing points make it possible to overcome the presence of stiffening ribs for the blades and the branches of one of the fans, or even for the two fans.
  • the two attachment points are angularly and radially offset relative to each other to obtain a robust attachment of the fans.
  • Said first and second overlapping portions are planar portions that extend in parallel transverse planes.
  • Each of said transverse planar overlap portions extends in the same plane as the central flange from which extends the corresponding branch.
  • At least one blade of one of the fans is angularly interposed between at least two consecutive blades of the other fans.
  • At least each of the blades of one of the fans is carried by a branch having a lap portion with a lap portion of a branch carrying a blade of the other fan, and said fastening means of the two fans are arranged at least partly at all of said branch covering portions.
  • An angular indexing means intervenes between the first and second flanges to angularly position the blades first blades relative to the second blades.
  • Each flange is centrally perforated and comprises, in its inner radial edge, a notch so as to obtain said relative angular positioning of blades by coinciding the notches.
  • one of the fans comprises a projection penetrating in a complementary way in a recess or opening of the other fan so as to constitute means of angular indexing by cooperation of complementary shapes.
  • the first and second flanges are superimposed.
  • the first and second flanges are in direct or indirect contact with the interposition of a thermal insulation means, such as a coating or a thermally insulating layer.
  • one of the fans preferably the one farthest from the rotor, is mounted with prestressing on the rotor.
  • the figure 1 is only intended to briefly recall the general structure of a polyphase alternator with internal ventilation for a motor vehicle engine, in order to place the invention in its context of preferred use.
  • the alternator shown essentially comprises a rotor 10 surrounded by a stator 12 and rotatably mounted on a rotor shaft 14, the front end of which rotates a pulley 16 and the rear end of the slip rings (not referenced) belonging to a manifold 18.
  • the pulley 16 is intended to be connected to the engine of the vehicle by a belt transmission.
  • the rotor 10 is here of the claw type and comprises two pole wheels, designated by the references 20 and 21, having axially oriented teeth angularly offset from one wheel to the other.
  • Reference 22 designates the excitation winding of the rotor mounted between the front wheels 20 and rear wheels 21.
  • the stator comprises a body 24 internally provided with notches for the passage of wires or pins from the windings 26 of the stator.
  • the coils 26 pass through the body 24, constituted by a stack of axially stacked sheets, and extend in axial projection from each other. other body 24 to form a front bun and a rear bun (not referenced).
  • the number of coils 26 depends on the applications, in particular the number of phases that the alternator comprises.
  • the rotor shaft 14 is supported by front and rear ball bearings 28 mounted in axial end bearings respectively front 32 and rear 34 here perforated with louvers 36, 38 for the circulation of air.
  • the bearings 32, 34 have a hollow shape and are shaped to carry at their outer periphery the body 24 of the stator 12. Tie rods or screws, shown in the document FR-A-2602925 mentioned above, connect the bearings 32 and 34 constituting a hollow support or housing intended to be fixed on a fixed part of the vehicle.
  • Reference numeral 40 denotes the conventional rectification device 41 of the alternating current produced by the machine. This device is connected to the outputs of the windings 26 of the stator and is carried here by the rear bearing 34, which also carries a voltage regulator (not visible at the figure 1 ) and a brush holder (shown partly in figure 1 ).
  • the brushes (not referenced), slidably mounted in the brush holder, are intended to cooperate with the slip rings of the manifold 18 which are connected by wire bonds to the ends of the excitation coil 22, while the brushes are connected to the voltage regulator which, in a manner known per se, thus controls the excitation winding.
  • the alternator comprises front and rear ventilation devices 42 each of which is fixed in rotation on a front transverse front face 44, rear 46 respectively of the front pole wheel 20 and the rear pole wheel 21.
  • Each ventilation device or fan 42 comprises an annular central flange 48 applied and fixed on the end face 44, 46 of the support pole wheel and, at its outer periphery, a plurality of blades 50 projecting axially with respect to the flange 48.
  • the two ventilation devices or fans 42 which therefore extend in the vicinity of the front bearing 32 and the rear bearing 34, have the function of creating a circulation of a cooling fluid, in this case air, for cooling the hottest active parts of the alternator, such as the diodes 41 of the rectifying device 40, the bearings 28, 30, the rotor winding 10 and the stator windings 26, passing through various appropriate openings in the bearings, as illustrated by arrows.
  • a cooling fluid in this case air
  • each bearing 32, 34 has centrally in the vicinity of the associated bearing 28, 30 air inlet openings facing a portion of the blades 50 and outlet openings facing the bun concerned windings 26.
  • the ventilation devices or fans 42 are located beneath the bunches of the windings, knowing that the ventilation device, or rear fan, is advantageously more powerful than the ventilation device, or fan, before, since it must also cool the device. rectification 40 and the voltage regulator.
  • the figure 2 illustrates a rear ventilation device according to the invention which is designed for this purpose. It is generally referred to as 60 and is, in the embodiment described, in the place of the rear fan 42 of the figure 1 , the front of the device 60 being in direct or indirect contact with the rear transverse face 46 of the wheel 21.
  • This ventilation device 60 here comprises two adjacent fans 62a, 62b, hereinafter referred to respectively first fan and second fan.
  • the second fan 62b is intended to be fixed, for example in known manner by welding or riveting points, on the end face 46 of the axial end concerned of the rear rotor wheel 21 of the rotor of the figure 1 .
  • the second fan 62b is in contact with the polar wheel concerned.
  • This contact is a direct or indirect contact means, hereinafter third means of thermal insulation, such as a coating or a layer of electrically insulating material, being interposed at least locally between the pole wheel 21 concerned and the second 62b fan.
  • each fan 62a, 62b is metallic and economically made of sheet metal.
  • Each fan 62a, 62b comprises a central portion in the form of annular flange 64a, 64b substantially flat annular transverse orientation which is provided with a circular central opening 66a, 66b for the passage of the rotor shaft 14 of the figure 1 , and at its outer periphery, radially outwardly projecting, a series of fan blades 68a, 68b protruding axially relative to the flange 64a, 64b.
  • Outwardly diverging ventilation channels are thus formed on each fan.
  • each fan 62a, 62b are distributed angularly so that between at least two consecutive blades 68a, 68b of one of the fans 62a, 62b is located at least one blade 68b, 68a of the fan. other fan 62b, 62a.
  • the blades are, in one embodiment, distributed angularly in a regular manner.
  • the first and second blades are not distributed angularly regularly to reduce noise, the circumferential intervals between two consecutive blades 68a, 68b are not regular.
  • the blades 68a, 68b are here obtained by cutting and folding from their metal flange 64a, 64b and have a curved shape as best visible in the figure 2 , the ventilation device 60 here being of the centrifugal type. Blades 68a and 68b are here of the same type.
  • the blades 68a, 68b are radially long and are therefore very efficient in terms of ventilation.
  • the blades here radially longer than their axial height.
  • the second blades 68b are reinforced by pairs of parallel ribs 67b, which, thanks to the invention, can be extended at the level of the branches 78b, which the fan 62b presents, by ribs of great length because the second fans are provided with as described hereinafter of branches 78b with second cover portions.
  • the blades are plane in being of radial orientation, the fan being centrifugal.
  • the blades are inclined with respect to an axial and / or radial direction.
  • the blades are axially higher than long radially.
  • the blades may be inclined and curved with respect to the plane of the flange concerned as described in the document FR-A-2602925 supra.
  • the blades of this fan are in the form of a helix, the fan being of the helico-centrifugal type.
  • at least some blades are perpendicular to the plane of the flange and of non-radial orientation. All combinations are possible, the blades of each of the fans being of the centrifugal, helico-centrifugal or axial type.
  • the distribution of the blades is determined according to the electric machine to be cooled to obtain the best cooling with a minimum aerodynamic noise.
  • An angular indexing means intervenes between the two flanges 64a, 64b for a good angular position and therefore a good orientation of the blades 68a, 68b.
  • each flange 64a, 64b has, in the edge of its central circular opening 66a, 66b a pair of notches 72a, 72b and 74a, 74b.
  • the notches 72a, 72b and 74a, 74b here have a bottom of identical shape, namely a semi circular bottom. Note that the notches 72a and 72b are deeper than the notches 74a, 74b so that it allows to angularly index the two fans relative to each other.
  • This assembly is then fixed on the rotor for example by spot welding or through the laser type, by screwing or riveting, the rivets being advantageously from the rotor.
  • the blades 68a, 68b are here all axially substantially at the same height, that is to say that the free edges 69a, 69b of the blades are in the same transverse plane. More precisely, the blades 68a have a slightly lower height than the blades 68b, the difference in height being equal to the thickness of the second flange 64b.
  • the blades 68a, 68b are axially different heights. As a result, The free edges 69a, 69b of the blades are then not all in the same plane.
  • the embodiment of the ventilation device 60 in two parts or fans having complex blade configurations giving them an increased cooling power, is obtained at a relatively low cost, while having a good mechanical strength.
  • attachment points 76 have a large geometric extent, thanks to the characteristics of the invention d written below, and here are six in number. These points are shown in Figures 2 to 4 by circular gridded portions.
  • the fastening means between the two fans 62a and 62b intervene between at least a first branch 78a and a second branch 78b having a first and a second overlapping portion for forming a covering zone Z.
  • each flange 64a, 64b has radially outwardly projecting at its outer periphery respectively branches 78a, 78b respectively called first branches 78a and second branches 78b.
  • Each branch 78a, 78b thus extends transversely in the plane of the central annular flange 64a, 64b and carries in this embodiment respectively a first blade 68a and a second blade 68b.
  • the blades are formed each at the free end of a branch being each carried by a branch.
  • the branches are respectively obtained by cutting and the blades by folding at the free end of the branch concerned from the metal flange of the fan concerned.
  • the blades are each connected to a branch being here in one piece with this branch.
  • the shape of the branches depends on the applications
  • the aforementioned two branches 78a, 78b are superimposed and overlap or overlap at least partly in a zone of overlap Z which is indicated in dashed lines at the figure 3A , and it is thus possible to achieve here pairs of associated attachment points 80 and 82.
  • These points 80, 82 have a range less than that of the attachment points 76.
  • the ribs 67b here because of two per blade 68b, also affect the branches 78b and extend to the vicinity of a blade 68a.
  • each radially outer fixing point 80 is also angularly offset in the blade direction with respect to the radially inner point 82.
  • Each blade 68a is connected to a first branch 78a, which is in overlap with a second branch 78b connected to the blade 68b and each overlap zone Z has two attachment points 80 and 82.
  • the attachment between the two fans 62a, 62b is thus particularly rigid, while allowing the arrangement of a large number of attachment points 76 of the ventilation device 60 on the rotor. This attachment makes it possible not to ribb the blades 68a.
  • the two fixing points belonging to a pair of points 80, 82 in a covering zone Z are at most distant from each other, being arranged at the boundaries of this zone Z for covering the branches 78a, 78b to further increase this overall rigidity, as well as the rigidity of these branches, forming the roots of the blades, and the rigidity of the corresponding blades 68a, 68b.
  • the attachment points 80, 82 can be made according to all known and adapted technologies.
  • They can for example be made by gluing or welding to reduce costs.
  • They can also be constituted by rivets which are preferably obtained by extrusion as visible in 79b at the figure 12 .
  • the two flanges of the fans 62a, 62b are metallic and the head of the rivet 79b, obtained by extrusion of the flange of the fan 62b, is crushed in contact with the covering portion of the branch 78a of the fan 62a having a passage hole of the rivet 79b .
  • the head of the rivet 79b is not crushed and the assembly is made by clinching, the hole of the covering portion of the branch 78a being sized for force fitting said portion 78a on the rivet 79b.
  • one of the two fans can be made of plastic.
  • the first fan 62a is for example preferably plastic while the second fan 62b is made of metal for producing a rivet 79b by extrusion.
  • a first thermal insulation means occurs at least in the major part between the two flanges of the fans.
  • second thermal insulation means intervening between the covering portions of the branches 78a, 78b.
  • the first fan 62a is metallic and the second fan 62b plastic so that in the figure 12 the heads of the rivets 79b molded with the second fan are hot-crushed.
  • the rivets 79b instead of being of hollow form, as in the Figures 11 and 12 , are of solid form and advantageously a third heat insulating means occurs at least in the major part between the flange of the fan 62b and the rotor.
  • the first, second and third thermal insulation means consist for example of a layer or a thermally insulating coating, for example a material having the properties of asbestos. All combinations are possible whatever the nature (metal or plastic) of the fan. These combinations also apply to the other embodiments.
  • the second fan may be provided on one of its faces with a first thermally coated insulation for cooperating with the rotor and on the other of its faces at the branches 78b of a coating to cooperate with the branches 78a.
  • the second fan is provided with three thermal insulation means.
  • the entire zone Z is in one embodiment at least partly a bonding zone.
  • the fixing points can be connected to form a fastening strip for example obtained by gluing or transparent welding, also called through welding, of the laser type. This is possible thanks to the invention.
  • At least one branch for example a second branch, may be devoid of blades.
  • a blade-free branch has a covering portion with an overlapping portion of a branch with or without a blade.
  • one of the fans 62a may comprise a central flange 84a for stiffening which projects axially.
  • This collar 84a is alternately extended axially to form a sleeve for mounting, for example by forced fitting, an annular magnetic target used in the case of an alternator-starter, as visible for example in the figure 12 of the document WO 01/69762 which will be referred to for more details.
  • This collar 84a further stiffens the first fan 62a, which is thus in a thicker embodiment than the fan 62b.
  • the flange can participate in the relative centering of the two fans, especially when it is the second fan 62b which has such a flange. In this case the inner periphery of the first fan is in intimate contact with the outer periphery of this collar.
  • the invention is not limited to the fixing of two superimposed fans for the realization of a ventilation device, the number of fans may be higher depending on the complexity of the device, and in particular depending on the number and the conformation of the blades.
  • FIG. figure 1 Representatives Figures 5 to 7 another example for the realization of a rear ventilation device, which is intended to replace the rear device 42 shown in FIG. figure 1 which is fixed on the front transverse face 44 of the front wheel 20.
  • the figure 5 illustrates a rear ventilation device according to the invention which is designed for this purpose. It is generally referred to as 60 and is, in the embodiment described, in the place of the rear fan 42 of the figure 1 , the rear of the device 60 being in direct or indirect contact with the transverse face 46 of the rear wheel 21.
  • This ventilation device 60 here again comprises two adjacent fans 62a, 62b, hereinafter referred to respectively as the first fan and the second fan.
  • the second fan 62b is intended to be fixed, for example in known manner by welding points or by riveting, on the end face 44 of the axial end concerned of the rear rotor wheel 21 of the rotor of the figure 1 .
  • the second fan 62b is in contact with the polar wheel concerned.
  • This contact is a direct or indirect contact, a third thermal insulation means, such as a coating or a layer of electrically insulating material, being interposed at least locally between the pole wheel 21 concerned and the second fan 62b.
  • one of the two fans here the first fan 62a, may comprise grooves or ribs 86a of radial orientation for the passage of the wire links of the ends of the excitation coil. 22 to the slip rings of the manifold 18, these ribs 86a also participating in the stiffening of the first fan 62a.
  • the second fan 62b is made in two parts, substantially in two halves so as to define two slots 86b arranged facing the open faces of the grooves 86a.
  • the second fan can be made in more than two parts, for example three parts.
  • This second fan 62b is in a less thick embodiment than the first fan 62a.
  • the first blades 68a each comprise an end chamfer 88a so as to improve the mechanical resistance against the centrifugal force.
  • a blade 68a As shown in the figure 7 , it is alternatively possible to stiffen a blade 68a by a corner stamping, or rebrappe, 90a formed at the radial end of the blade at the connection fold between its curved active main portion and axial orientation, and its branch 78a.
  • the figure 8 represents an alternative embodiment of a front ventilation device 60 according to the invention with non-regular blades and which comprises a single series of mutual attachment points 80 arranged in a circle and distributed in a substantially regular manner.
  • This device 60 is intended to be mounted in place of the device before 42 ventilation of the figure 1 .
  • the central annular flanges are almost completely disengaged, especially with a view to arranging the fixing points of the ventilation device 60 on the front wheel 20 of the rotor.
  • Ventilators are possible for the cooling of a rotating electrical machine which may also include only one ventilation device at one of the axial ends of the rotor.
  • portions of mutual overlapping blades which are not necessarily portions of the transverse orientation roots of the blades, but for example axially oriented portions provided for this purpose. effect or belonging to the curved active parts of the blades.
  • attachment point 76 of a ventilation device will now be described on the rotor, knowing that in general one of the fans 62a, 62b is designed to have attachment points 76 intended to be mounted on the rotor of the rotating electrical machine and advantageously these s attachment points 76 have a larger size than the attachment points 80, 82 of the two fans 62a, 62b as described above.
  • This first example illustrated in figure 9 corresponds to a first fan 62a of plastic or metal and a second fan 62b of metal.
  • the second flange comprises a stamping 94b so that the welding point 76 sweeps the rotor is of the type standard. It will be appreciated that the hole 92a in the flange 64a is large thanks to the invention.
  • the figure 10 illustrates an inversion from what is represented in the figure 9 with the second flange 64b of plastic or metal and the first flange 64a of metal. It will be appreciated that the second flange is well plated on the rotor because it is sandwiched between the relevant face of the rotor of the rotor. figure 1 and the first flange 64a.
  • the hole 92b in the flange 64b is also large thanks to the invention which allows to stamp locally the flange 64a so that it enters the hole 92b.
  • the flange 64a is staged locally so that the point solder 76 is of the standard type.
  • the weld point is alternatively obtained by stamping the flange concerned in the other direction with respect to Figures 9 and 10 .
  • the figure 13 analogous to the figure 10 , shows such an embodiment, the stamped in the opposite direction bearing the reference 194a, the dorsal face of this stamped revealing a trapezoidal footprint.
  • the stamp is deeper as visible in 294a and 394a in the Figures 14 and 15 analogous to the figure 10 , the stamp 394a being of similar shape to the stamped 194a, while the stamp 294a is similar to the embossed 94a.
  • the ventilation device according to the invention can be mounted in a reversible alternator, called alternator-starter, which can also operate in electric motor mode, in particular to start the engine of the motor vehicle as described in document WO 01/69762 .
  • this ventilation device can be mounted in an alternator having a rotor with salient poles and / or permanent magnets as described in document WO 02/054566 .
  • the rotor comprises a pack of cut sheets for forming housing, intended to receive permanent magnets, and for arm formations around which are wound excitation coils.
  • the housings of the magnets are closed by non-magnetic holding parts having recesses for receiving the excitation coils. These pieces extend on either side of the sheet metal bundle by being integral with this bundle, for example by means of tie-rods of the pieces and the bundles of sheets.
  • these holding pieces are provided with locally threaded bosses for screw fastening of the ventilation device as in the embodiment of the Figures 15 and 16 of this document WO 02/054566 .
  • the alternator can also be water cooled and equipped with axial fans.
  • the stator windings may comprise conductor elements in the form of bars, such as generally U-shaped pins and advantageously rectangular section as described in the document FR A 2,820,896 .
  • the internal ventilation device according to the invention allows to cool the head of the pins because it can have the desired shape.
  • stator windings each comprise a delta winding and a star winding of different cross section mounted in the same notches as described in the documents.
  • the alternator may have only a ventilation device at the rear thanks to the power of the ventilation device according to the invention.
  • the ventilation device according to the invention makes it possible to obtain blades of the same configuration, in particular identical but which are very close together and thus in large numbers and / or blades of long or complicated shape, and which in fact can not be made by folding from a single fan.
  • At least one blade of one of the fans is endowed, in overhang, with a fin extending inclined or perpendicular with respect to the plane of the flange of the fan concerned as described and visible in FIGS. Figures 11 to 13 of the document FR A 2,811,156 .
  • at least one blade and preferably at least some of the blades at least one of the fans can be corrugated or be axially decreasing height or be flat and inclined relative to a radial direction as respectively in the figures 6 , 15 and 2 of this document.
  • the ventilation device makes it possible to manufacture easily and economically at least one fan provided with at least one blade, preferably several blades, having a configuration such that the entry angle formed on the inner circle between the blade and the direction of the radius at this point of the circle is substantially the same as the exit angle formed on the outer circle between the blade and the corresponding radius as described in the application FR 01 14301 filed on 31/10/2001 , said angle being identical to the entry and exit angles for all points between entry and exit.
  • this arrangement is minimized turbulent flows of the cooling fluid, here air, while having a large number of blades.
  • At least a portion of the blades of at least one of the fans may be configured in such a way that the angle of incidence of the blades at the leading edge is between 150 ° and 175 °, and angle of incidence of the blades, at the trailing edge, is between 90 ° and 165, relative to the tangent to a circle generated during the rotation of the blades, the ratio between the average pitch of the blades and the length average of these latter is less than 0.975 as described in the application FR 01 05772 filed on 27/04/2001 . With this arrangement is reduced friction losses of the cooling fluid.
  • At least one blade of at least one of the fans has perforations, such as holes or slots, for passage of the cooling fluid, in this case air, from one face to the other of this blade to compensate for the slowing down of the fluid vein and thus avoid the separation of the fluid and reduce the noise.
  • At least one blade of at least one of the fans extends alternately inclined with respect to the plane perpendicular to the flange of the fan concerned.
  • the blades of the fans extend axially in the same direction.
  • At least one fan has at least one blade axially directed in opposite direction relative to the other blades so that the fan comprises at least two blades extending on either side of its flange. These blades in an embodiment extending in the space between the teeth of the pole wheels 20,21 of the rotor 10.
  • At least one of the fans in one embodiment is made by molding a plastic material on an advantageously metal insert so that the blades can be at least partially made of plastic.
  • the insert extends at least substantially over the full extent of the fan flange or at least two-thirds of the overmoulded part of the fan as described in the document. FR A 2,830,293 which will be referred to for more details.
  • the blade is reported at least in part on its associated branch.
  • FIG. figure 16 in order to reduce the noise, at least part of the space between the teeth of the adjacent polar wheel can be plugged at least partly as visible in FIG. figure 16 .
  • this figure is shown in 120 the teeth of the front wheel 20 and 220 the spaces between the teeth 120, the fan being of the type of that of the figure 8 .
  • overlapping areas Z are located opposite spaces 220 to block here in part these.
  • the balancing is alternatively carried out by performing at least one piercing in at least one of the fans at a branch overlap area as visible in 176 at the figure 3 and at 276 in FIG. 26, the bore in this figure being made in a suitable branch of the fan 62a between two fixing points 80, 82.
  • At least in the fan 62a may be removed from the material in the vicinity of a point of attachment of the branches as visible in FIG. figure 3 .
  • chamfers 88a also make it possible to achieve a balancing. It is the same in making openings in the blades.
  • Dynamic balancing can be achieved in advance by adding material as visible in 179 to the figure 16 .
  • the first fan 62a is mounted with prestressing on the rotor as described for example in the document FR A 2,743,951 , the faces 44 and / or 46 of the wheels 20, 21 being of frustoconical shape and the attachment sweating the rotor made by riveting or crimping.
  • the two fans are fixed on the rotor with a ring force-fitted on the grooves of the rotor shaft 14.
  • the shaft is threaded and the ring consists of a nut.
  • the nets the rotor shaft is oriented in the opposite direction to the direction of rotation of the machine.
  • the fan 62a comprises, as at figure 2 , a flange force-fitted on striations of the rotor shaft.
  • the ring is mounted by shrinking on the rotor shaft.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (19)

  1. Lüfter (60), der geeignet ist, auf einer axialen Querendfläche (44, 46) eines Rotors einer elektrischen Drehmaschine befestigt zu sein, umfassend:
    - einen ersten Lüfter (62a), umfassend einen ersten zentralen Flansch (64a) mit Querausrichtung, von dem aus sich radial nach außen erste Flügel (68a) erstrecken;
    - mindestens einen zweiten Lüfter (62b), umfassend einen zweiten zentralen Flansch (64b) mit Querausrichtung, von dem aus sich radial nach außen zweite Flügel (68b) erstrecken;
    und Mittel zur Befestigung der zwei Lüfter (62a, 62b),
    bei dem jeder Flansch (64a, 64b) eines Lüfters (62a, 62b) an seiner äußeren Peripherie radial nach außen vorspringend erste Schenkel (78a) bzw. zweite Schenkel (78b) umfasst, und bei dem mindestens gewisse der ersten (78a) und zweiten (78a) Schenkel einen Flügel tragen,
    bei dem mindestens ein erster Schenkel (78a) des ersten Lüfters (62a) und mindestens ein zweiter Schenkel (78b) des zweiten Lüfters (62b) einen ersten (78a) und einen zweiten (78b) wechselseitigen Überlappungsabschnitt, die übereinander angeordnet sind, zur Bildung einer Überlappungszone (Z) umfassen,
    dadurch gekennzeichnet, dass die Befestigungsmittel (80, 82) der zwei Lüfter zumindest teilweise im Bereich der Überlappungszone (Z) angeordnet sind, und dass die Befestigungsmittel der zwei Lüfter mindestens einen Befestigungspunkt (80, 82) der Überlappungsabschnitte (78a, 78b, Z) der zwei Schenkel (78a, 78b) umfassen.
  2. Lüfter nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die Befestigungsmittel der zwei Lüfter mindestens zwei Befestigungspunkte (80, 82) der Überlappungsabschnitte (78a, 78b, Z) der zwei Schenkel umfassen.
  3. Lüfter nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die zwei Befestigungspunkte (80, 82) in der Nähe von gegenüberliegenden Enden der zwei Überlappungsabschnitte der zwei Schenkel angeordnet sind.
  4. Lüfter nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die zwei Befestigungspunkte (80, 82) im Winkel und radial zueinander versetzt sind.
  5. Lüfter nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass der oder die Befestigungspunkte durch Schweißen oder Kleben hergestellt sind.
  6. Lüfter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass einer der Lüfter (62a, 62b) ausgebildet ist, um Befestigungspunkte (76) auf dem Rotor der elektrischen Drehmaschine aufzuweisen, dass die zwei Lüfter (62a, 62b) mindestens zwei Überlappungszonen (Z) aufweisen, die jeweils mit mindestens einem Befestigungspunkt (80, 82) versehen sind, und dass die Befestigungspunkte (76) eines der Lüfter (62a, 62b) auf dem Rotor der elektrischen Drehmaschine eine größere Größe als die Befestigungspunkte (80, 82) der zwei Lüfter (62a, 62b) haben.
  7. Lüfter nach Anspruch 6, dadurch gekennzeichnet, dass ein Teil der Befestigungsmittel in der Nähe eines der Befestigungspunkte auf dem Rotor angeordnet ist.
  8. Lüfter nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass Ausgleichsmittel im Bereich des Befestigungspunktes (80, 82) der Überlappungsabschnitte (78a, 78b, Z) der zwei Schenkel (78a, 78b) angeordnet sind.
  9. Lüfter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die ersten und zweiten wechselseitigen Überlappungsabschnitte der Schenkel (78a, 78b, Z) ebene Abschnitte sind, die sich in parallelen Querebenen erstrecken.
  10. Lüfter nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass sich jeder der ebenen Querabschnitte wechselseitiger Überlappung der Schenkel (78a, 78b, Z) in derselben Ebene wie der zentrale Flansch (64a, 64b) erstreckt, von dem aus sich der entsprechende Flügel (68a, 68b) erstreckt.
  11. Lüfter nach einem der Ansprühe 1 bis 10, dadurch gekennzeichnet, dass der eine (62b) der Lüfter (62a, 62b) an mehreren Teilen auf dem anderen Lüfter (62a) durch Befestigungsmittel (80, 82) der zwei Lüfter befestigt ist.
  12. Lüfter nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass die zentralen Flansche übereinander und aneinandergrenzend angeordnet sind, und ihre Befestigungsmittel von einer oder mehreren Reihen von Befestigungspunkten gebildet sind.
  13. Lüfter nach Anspruch 12, dadurch gekennzeichnet, dass die oder mehrere Reihen von Befestigungspunkten in Kreis(en) angeordnet sind, die an der Oberfläche der zwei übereinander angeordneten Flansche verteilt sind.
  14. Lüfter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mindestens einer der Flügel eines der Lüfter von einem Schenkel getragen wird, der mit einem Überlappungsabschnitt (Z) mit einem Überlappungsabschnitt eines Schenkels, der einen Flügel des anderen Lüfters trägt, versehen ist, und dass die Befestigungsmittel (80, 82) der zwei Lüfter zumindest teilweise im Bereich zumindest gewisser der Überlappungsabschnitte der Schenkel angeordnet sind.
  15. Lüfter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Winkelindexierungsmittel (72a, 74a, 72b, 74b) zwischen dem ersten und dem zweiten Flansch (64a, 64b) eingreift, um die ersten Flügel in Bezug zu den zweiten Flügeln im Winkel zu positionieren, und dass der erste und der zweite Flansch (64a, 64b) übereinander angeordnet sind.
  16. Lüfter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Wärmeisoliermittel zwischen dem ersten (78a) und dem zweiten (78b) wechselseitigen Überlappungsabschnitt angeordnet ist.
  17. Lüfter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass mindestens ein Flügel eines der Lüfter im Winkel zwischen mindestens zwei aufeinanderfolgenden Flügeln des anderen der Lüfter zwischengefügt ist.
  18. Lüfter nach Anspruch 17, dadurch gekennzeichnet, dass die Flansche der Ventilatoren metallisch sind, und dass die Flügel durch Ausschneiden und Falzen aus ihrem metallischen Flansch erhalten werden.
  19. Lüfter nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Flansche der Lüfter ringförmig sind.
EP04742729.9A 2003-05-26 2004-05-14 Lüfter für einen wechselstromgenerator Expired - Lifetime EP1627151B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0306348A FR2855672B1 (fr) 2003-05-26 2003-05-26 Dispositif de ventilation, notamment pour alternateur de vehicule automobile
PCT/FR2004/001180 WO2004106748A1 (fr) 2003-05-26 2004-05-14 Dispositif de ventilation, notament pour alternateur de vehicule automobile

Publications (2)

Publication Number Publication Date
EP1627151A1 EP1627151A1 (de) 2006-02-22
EP1627151B1 true EP1627151B1 (de) 2019-06-12

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US (1) US7358630B2 (de)
EP (1) EP1627151B1 (de)
JP (1) JP4664917B2 (de)
CN (1) CN100507279C (de)
FR (1) FR2855672B1 (de)
WO (1) WO2004106748A1 (de)

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TWI319257B (en) * 2006-05-26 2010-01-01 Delta Electronics Inc Fan, motor and bearing structure thereof
FR2908942B1 (fr) * 2006-11-22 2014-03-07 Valeo Equip Electr Moteur Dispositif de ventilation pour machine electrique tournante, machine electrique tournante comportant un tel dispositif et procede de fabrication d'un tel dispositif
JP4599376B2 (ja) * 2007-07-18 2010-12-15 三菱電機株式会社 回転電機
DE102007049149A1 (de) * 2007-10-12 2009-04-16 Robert Bosch Gmbh Verfahren zum Verbinden von Teilen eines mehrteiligen Rotorträgers und Rotorträger einer elektrischen Maschine
FR2927737B1 (fr) 2008-02-18 2019-03-22 Valeo Equipements Electriques Moteur Palier de machine electrique tournante et machine electrique tournante comportant un tel palier
CN102403845B (zh) * 2010-09-14 2014-05-07 上海福源智业投资集团有限公司 激光焊接风道壁的生产工艺
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JP6094395B2 (ja) * 2013-06-17 2017-03-15 株式会社デンソー 回転電機の回転子
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Also Published As

Publication number Publication date
WO2004106748A1 (fr) 2004-12-09
US7358630B2 (en) 2008-04-15
JP4664917B2 (ja) 2011-04-06
FR2855672B1 (fr) 2005-08-19
EP1627151A1 (de) 2006-02-22
FR2855672A1 (fr) 2004-12-03
US20070041843A1 (en) 2007-02-22
CN1780989A (zh) 2006-05-31
CN100507279C (zh) 2009-07-01
JP2007502937A (ja) 2007-02-15

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