• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention essentially relates to an elastic member (40) for a rotating electrical machine (10) comprising a stator (15) carried by a housing (11). The elastic member (40) is assembled between the stator (15) and the casing (11) in a radial direction, is at least partially formed of a metallic material and is shaped to present a stiffness in the radial direction intended to filter vibrations of the stator (15).
    公开号:FR3069724A1
    申请号:FR1757116
    申请日:2017-07-27
    公开日:2019-02-01
    发明作者:Mathieu Redon；Pierre Faverolle；Andre Sauvignet；Maxime Grospeaud
    申请人:Valeo Equipements Electriques Moteur SAS；
    IPC主号:
    专利说明:

    ROTATING ELECTRIC MACHINE COMPRISING A
    ELASTIC BODY
    TECHNICAL FIELD OF THE INVENTION
    The present invention relates to an elastic member for a rotary electric machine fitted to a motor vehicle and a rotary electric machine comprising such an elastic member.
    TECHNOLOGICAL BACKGROUND OF THE INVENTION
    A motor vehicle with a thermal engine is equipped with an alternator which has the function of transforming the mechanical energy coming from the engine into electric energy with the aim in particular of recharging the vehicle battery and of supplying the on-board network of the vehicle. To do this, the alternator comprises a rotor mounted on a shaft driven in rotation and a stator surrounding the rotor, the stator being carried by a casing.
    When the alternator is in operation, the rotor generates a rotating magnetic field which acts on the stator and makes it vibrate. Depending on the speed of rotation of the alternator, the vibrations of the stator can generate a magnetic noise which manifests itself in the form of a whistling sound, which causes hearing impairment.
    In order to attenuate the magnetic noise, it is known, in particular from document EP 1249064 B1, to insert between the stator and the housing vibration damping elements such as buffers and resin. A drawback to this procedure is that the installation of such damping elements requires a lot of time. Indeed, it is necessary in particular to position the pads, pour the resin and wait for it to polymerize.
    SUMMARY OF THE INVENTION
    The present invention aims to solve the problem which has just been mentioned by proposing a means of damping the vibrations of a rotary electrical machine which is faster to install.
    To this end, a first aspect of the invention relates to a rotating electric machine for a motor vehicle. The machine comprises a stator, a casing surrounding a rotor and the stator, the rotor being rotated about an axis, an elastic member disposed between the stator and the casing in a radial direction, the elastic member being at least partially formed of a metallic material and being shaped to have a stiffness in the radial direction intended to filter vibrations of the stator.
    The elastic member is a mechanical part which is placed between the stator and the casing of the rotating electric machine. Consequently, its installation is quick to implement and does not require any waiting time unlike the case of the resin used in the prior art.
    For example, the elastic member extends circumferentially around the stator.
    According to one embodiment, the elastic member has a plane of symmetry, said plane of symmetry comprising the axis of rotation. In addition, the elastic member may also have a second plane of symmetry extending perpendicular to the axis of rotation.
    According to one embodiment, the elastic member has a cross section relative to the axis, the cross section being open. In this case, the first plane of symmetry passes through the opening and in particular through the center in a circumferential direction of said opening.
    According to one embodiment, the elastic member forms an arc of a circle having an angle of at least 240 °.
    According to one embodiment, the elastic member has a wavy shape. The corrugation is carried out in the direction of positioning of said member between the casing and the stator. The ripple can thus be radial if the elastic member is positioned radially between the casing and the stator. Alternatively, the corrugation can be axial if the elastic member is positioned axially between the casing and the stator.
    According to one embodiment, the elastic member includes bosses. The bosses extend in particular in a radial direction.
    According to one embodiment, the elastic member comprising an internal surface oriented towards the reference axis and an external surface opposite the internal surface, the external surface and / or the internal surface being provided with bosses.
    According to one embodiment, each boss has a height, in a radial direction, preferably between 0.5 mm and 30 mm.
    According to one embodiment, each boss has a support surface which extends axially.
    According to one embodiment, the elastic member has at least one opening disposed adjacent to one of the bosses. In this case, the elastic member has openings arranged on either side of at least one boss.
    For example, the opening extends in an axial direction. Alternatively, the opening extends in a circumferential direction.
    According to one embodiment, the elastic member has a thickness, in a radial direction, of between 0.6 mm and 30.1 mm.
    According to one embodiment, the stator comprises a body extending axially over a first length, the elastic member extending axially over a second length of between 10% and 120% of the first length.
    According to one embodiment, the machine comprises a second elastic member extending between the stator and the casing in an axial direction and being shaped to have a stiffness in the axial direction intended to filter vibrations of the stator. This second elastic member can come in addition to the first elastic member to dampen the transmission of vibrations in a second, in particular axial, direction.
    According to one embodiment, the casing comprises a first bearing called "front bearing" and a second bearing called "rear bearing", the elastic member mechanically connecting the stator to the front bearing, the front bearing corresponding to the bearing which is closest to the drive member of the rotating electric machine.
    BRIEF DESCRIPTION OF THE FIGURES
    The invention and its various applications will be better understood on reading the description which follows and on examining the figures which accompany it, among which:
    - Figure 1 is a schematic view in longitudinal section of an alternator, according to an embodiment of the invention;
    - Figure 2 is a schematic perspective view of a first example of an elastic member fitted to the alternator of Figure 1;
    - Figure 3 is an enlarged view of the bosses of the elastic member of Figure 2;
    - Figure 4 shows a first alternative embodiment of the bosses of Figure 3;
    - Figure 5 shows a second alternative embodiment of the bosses of Figure 3;
    FIGS. 6A and 6B represent variation curves of the magnetic noise of the alternator of FIG. 1 and of an alternator of the prior art as a function of the speed of rotation of the alternator, respectively without and with a phase alternator preheating;
    - Figure 7 is a schematic perspective view of a second example of an elastic member according to the invention.
    The figures are presented only as an indication and in no way limit the invention.
    For the sake of clarity, identical or similar elements are identified by identical reference signs in all the figures.
    DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION
    A motor vehicle with an internal combustion engine is equipped with a rotating electrical machine, such as an alternator or an alternator-starter, configured to transform the mechanical energy coming from the internal combustion engine into electrical energy with the aim in particular of recharging the vehicle battery. and electrically supply the vehicle's on-board network.
    An alternator-starter is a reversible alternator, that is to say that it also has an operating mode in which it transforms electrical energy into mechanical energy, in particular to start the heat engine of the motor vehicle. In this case, the rotating machine behaves like an electric motor.
    An embodiment of an alternator 10 according to the invention will now be described, with reference to FIG. 1. The alternator 10 comprises a rotor 12 mounted for rotation on a shaft 13 and a stator 15 surrounding the rotor 12. The rotor 12 and the stator 15 are arranged inside a casing 11 comprising a front bearing 16 and a rear bearing 17.
    The shaft 13 extends along a longitudinal axis X and is rotated by the motor via a motion transmission device comprising a pulley 20 fixed to a front end of the shaft 13. The longitudinal axis X of the shaft 13 forms the axis of rotation of the rotor 12.
    Throughout the description and in the claims, the terms "axial", "radial", "tangential", "interior", "exterior" and their derivatives are defined with respect to the longitudinal axis X.
    The stator 15 comprises a body 27 formed of a stack of sheets each having a generally annular shape. Notches are provided at the internal periphery of each sheet. The notches of the stacked sheets form grooves in which electrically conductive wires are wound so as to form armature coils 28. The coils 28 define electrical phases, each phase comprising at least one coil. The coils 28 form a front bun 29 and a rear bun 30 arranged on either side of the body 27 of the stator 15.
    The body 27 of the stator 15 has a generally cylindrical annular shape delimited by a front face arranged opposite the front bearing 16, a rear face arranged opposite the rear bearing 17, an internal cylindrical surface and an external cylindrical surface. The front and rear faces of the body 27 of the stator 15 are transverse with respect to the longitudinal axis X.
    The rotor 12 comprises two pole wheels 31 each comprising a flange disposed transversely to the longitudinal axis X and provided with claws 33 extending axially at the periphery of the flange. The claws 33 of one of the pole wheels 31 are angularly offset with respect to the claws 33 of the other pole wheel 31 so that the claws 43 of the two pole wheels 31 alternately interpenetrate. A cylindrical core 34 is axially interposed between the flanges 32 of the pole wheels 31. In this case, the core 34 consists of two half-cores each belonging to one of the flanges 32. This core 34 carries at its outer periphery a excitation coil 35 wound in an insulator radially interposed between the core 34 and the excitation coil 35.
    The bearings 16, 17 are each equipped with a ball bearing 18, 19 for the rotational mounting of the shaft 13. The rear bearing 17 is equipped with a brush holder 24 provided with brushes 23 arranged to rub on slip rings 21 electrically connected to the excitation coil 35 of the rotor 12. The excitation coil 35 can thus be supplied with an electric excitation current from a voltage regulator. The slip rings 21 are arranged on the rear end of the shaft 13.
    The alternator 10 is cooled by an air circulation generated by two fans 25, 26 arranged respectively on the front face and on the rear face of the rotor 12.
    The alternator 10 comprises an elastic member 40 disposed between the stator 15 and the casing 11. According to the embodiment of FIG. 1, the elastic member 40 is disposed between the stator 15 and a single bearing, in this case the front bearing 16, to facilitate assembly. According to other embodiments, the elastic member can mechanically connect the stator to the rear bearing or to the two bearings at the same time. The elastic member 40 is shaped to filter the vibrations of the stator 15 resulting from the electromagnetic forces present in the alternator 10 when it is in operation. Thus, the elastic member 40 limits the propagation of vibrations from the stator 15 to the casing 11 of the alternator 10 so as to reduce the magnetic noise of the alternator 10.
    The elastic member 40 is for example in the form of a tolerance ring, as illustrated in FIG. 2. In this case, the elastic member 40 is mounted around the external cylindrical surface of the body 27 of the stator 15. The elastic member 40 has an internal surface 41 arranged opposite, and preferably in contact with, the external cylindrical surface of the body 27 of the stator 15, and an external surface 42 opposite the internal surface 41.
    According to this embodiment, the elastic member 40 includes bosses 44 extending radially outwardly on the external surface 42. Conversely, the internal surface 41 is provided with recesses 45 having a shape complementary to the bosses 44. The bosses 44 act in as damping elements between the stator 15 and the casing 11. The bosses 44 of the elastic member 40 are better visible in FIG. 3.
    According to another embodiment, the bosses can be reversed, that is to say be formed on the internal peripheral surface 41.
    When the stator 15 is assembled in the casing 11, the bosses 44 of the elastic member 40 are at least partially elastically deformed in order to exert a radial force on the stator 15 and on the casing 11 so as to prevent the stator 15 from move axially and / or radially and / or in rotation relative to the casing 11. The bosses 44 of the elastic member 40 therefore make it possible to keep the stator 15 in position in the casing 11.
    The elastic member 40 extends axially over a total length LT preferably between 10% and 120% of the length LS of the body 27 of the stator 15. Thus, the elastic member can extend over an axial length less than that of the stator body or, as a variant, extend over a length greater than that of the stator body. The elastic member 40 has a thickness E, in a radial direction, preferably between 0.6 mm and 30.1 mm.
    Each boss 44 has a bearing surface 47 arranged in contact with the casing 11 if the bosses are arranged on an external circumferential face of the elastic member or in contact with the body 27 of the stator if the bosses are arranged on a circumferential face internal of said organ. In an alternative embodiment, the elastic member may include bosses located respectively on the internal and external faces of said member. The arrangement of the bosses on one side or the other may depend on the method of assembling the alternator in the sense that the bearing surface 47 is in particular in contact with the movable part (casing or stator) during the mounting of the stator. in the housing. The elastic member is therefore notably mounted, before assembly between the stator and the casing, on the stationary part during this assembly.
    The bearing surface 47 of each boss 44 extends axially over a length L preferably between 20% and 110% of the length LS of the body 27 of the stator 15. Each boss 44 has a height H, considered in a direction radial between the external surface 42 and the bearing surface 27, preferably between 0.5 mm and 30 mm. In addition, each boss 44 has for example a width, in a circumferential direction, preferably between 0.2 mm and 30 mm.
    For example, the bosses of the same elastic member 40 are all identical along the circumference of said member. Still for example, the bosses can be regularly distributed along the circumference of the elastic member or not regularly distributed. For example, groups of several bosses can be regularly distributed from one another, in this case in the figures the groups of two bosses are shown.
    The elastic member 40 has a cross section relative to the axis X which is open. In other words, the elastic member 40 is not a closed ring. Preferably, the elastic member 40 is such that it covers an angle of at least 240 °, which allows centering of the stator 15 relative to the casing 11.
    The elastic member 40 can be made of metal such as steel or aluminum. An advantage of using metal is to obtain good thermal conduction between the stator 15 and the casing 11 so as to dissipate the heat resulting from the generation of the current induced in the stator.
    According to alternative embodiments, the elastic member 40 may have openings 48 arranged on either side of each boss 44. As a variant, the elastic member 40 may have a single opening per boss 44, for example arranged in the middle of the boss. In another variant, a boss 44 can be formed from several strips spaced apart by openings.
    The openings 48 can extend axially as illustrated in FIG. 4, or tangentially as illustrated in FIG. 5. Optionally, each boss 44 can have an additional opening (not shown) made so as to separate the boss 44 into two parts having preferably identical dimensions. The different openings that the elastic member 40 includes, as well as their dimensions, are adapted to adjust the stiffness of the bosses 44, in particular in the radial direction, so that the elastic member 40 is rigid enough to hold the position in position. stator 15 in the casing 11 while being flexible enough to filter vibrations.
    FIG. 6A shows a first curve 601 of variation of the magnetic noise BM as a function of the speed of rotation V of an alternator according to the prior art and a second curve 602 of variation of the magnetic noise BM as a function of the speed of rotation V of the alternator 10 according to the invention. These two curves 601, 602 are obtained for an ambient temperature of approximately 25 ° C., the alternator being put into cold operation, that is to say that the alternator has not undergone a preheating phase before carrying out the measurement.
    In all the figures, the magnetic noise BM is expressed in acoustic decibel dB (A) w and the speed of rotation is expressed in revolutions per minute rpm.
    A reduction in the magnetic noise BM is observed at least in a speed range between 1800 rpm and 5200 rpm. The speed range between 1800 rpm and 4000 rpm is particularly interesting because it is there that the magnetic noise is most audible and therefore the most annoying. Indeed, beyond this range, the ventilation noise of the fans ensuring the cooling of the alternator covers the magnetic noise.
    Similarly to FIG. 6A, FIG. 6B shows a third curve 603 for variation of the magnetic noise BM as a function of the speed of rotation V of the alternator according to the prior art and a second curve 604 for variation of the magnetic noise BM as a function of the speed of rotation V of the alternator 10 according to the invention. On the other hand, these two curves 603, 604 are obtained when the alternator has undergone a preheating phase, also for an ambient temperature of around 25 ° C. It is also noted that in the speed range V between 1800 rpm and 4000 rpm the magnetic noise is reduced or remains approximately equal.
    FIG. 7 shows another example of a second elastic member 50 which can be mounted in the alternator 10 in addition to the elastic member 40.
    The elastic member 50 has for example a toroidal shape extending around an axis of revolution and is preferably formed of a metal. Such an elastic member can be assembled axially between each face of the body 27 of the stator 15 and the corresponding bearing 16, 17 so that the axis of revolution coincides with the axis of rotation X. Thus, the alternator 10 can comprise two second elastic members 50.
    The elastic member 50 has undulations which act as damping elements in the axial direction. The elastic member 50 has a cross section relative to the axis of revolution which is open.
    Naturally, the invention is not limited to the embodiments described with reference to the figures and variants could be envisaged without departing from the scope of the invention.
    权利要求:
    Claims (14)
    [1" id="c-fr-0001]
    claims
    1. Rotating electric machine for a motor vehicle, said machine (10) comprising:
    - a stator (15),
    - a casing (11) surrounding a rotor and the stator, the rotor being rotated about an axis (X), and
    - an elastic member (40) disposed between the stator (15) and the casing (11) in a radial direction, the machine being characterized in that the elastic member (40) is at least partially formed of a metallic material and in that it is shaped to have a stiffness in the radial direction intended to filter vibrations of the stator.
    [2" id="c-fr-0002]
    2. Machine according to claim 1, characterized in that the elastic member (40) has a plane of symmetry, said plane of symmetry comprising the axis (X).
    [3" id="c-fr-0003]
    3. Machine according to claim 1 or 2, characterized in that the elastic member (40) has a cross section relative to the axis (X), the cross section being open.
    [4" id="c-fr-0004]
    4. Machine according to any one of claims 1 to 3, characterized in that the elastic member (40) forms a circular arc having an angle of at least 240 °.
    [5" id="c-fr-0005]
    5. Machine according to any one of claims 1 to 4, characterized in that the elastic member (40) has a wavy shape.
    [6" id="c-fr-0006]
    6. Machine according to any one of claims 1 to 5, characterized in that the elastic member (40) has bosses (44).
    [7" id="c-fr-0007]
    7. Machine according to claim 6, characterized in that the elastic member (40) has an internal surface (41) oriented towards the axis (X) and an external surface (42) opposite the internal surface (41), the external surface (42) being provided with bosses (44).
    [8" id="c-fr-0008]
    8. Machine according to claim 6 or 7, characterized in that the elastic member (40) has an internal surface (41) oriented towards the axis (X) and an external surface (42) opposite the internal surface (41 ), the internal surface (41) being provided with bosses (44).
    [9" id="c-fr-0009]
    9. Machine according to any one of claims 6 to 8, characterized in that each boss (44) has a support surface (47) which extends axially.
    [10" id="c-fr-0010]
    10. Machine according to any one of claims 6 to 9, characterized in that the elastic member (40) has at least one opening (48) disposed adjacent to one of the bosses (44).
    [11" id="c-fr-0011]
    11. Machine according to claim 10, characterized in that the elastic member (40) has openings (48) arranged on either side of at least one boss (44).
    [12" id="c-fr-0012]
    12. Machine according to claim 10 or 11, characterized in that the opening (48) extends in an axial direction.
    [13" id="c-fr-0013]
    13. Machine according to claim 10 or 11, characterized in that the opening (48) extends in a circumferential direction.
    [14" id="c-fr-0014]
    14. Machine according to any one of claims 1 to 13, characterized in that it comprises a second elastic member (50) extending between the stator (15) and the housing (11) in an axial direction and being shaped to present a stiffness in the axial direction intended to filter vibrations of the stator.
    类似技术:
    公开号 | 公开日 | 专利标题
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    WO2018197640A1|2018-11-01|Rotary electric machine with shrink-fitted bearing
    FR3013640A1|2015-05-29|TRANSMISSION ASSEMBLY FOR A HYBRID VEHICLE EQUIPPED WITH A PENDULAR SHOCK ABSORBER
    EP3836368A1|2021-06-16|Rotating electrical machine comprising an elastic member
    FR2901427A1|2007-11-23|DYNAMOELECTRIC ROTOR
    EP3549237B1|2020-11-25|Rotor for a rotating electrical machine
    FR3063586A1|2018-09-07|ROTOR OF ROTATING ELECTRIC MACHINE HAVING AT LEAST ONE INTEGRATED FAN BEARING
    FR3103653A1|2021-05-28|Rotating electric machine with axial stator locking
    FR2833774A1|2003-06-20|Double circuit induction rotor for a rotating electric machine, such as a motor or alternator, especially for automotive vehicle
    FR3054743B1|2019-11-15|COIL FOR ROTATING ELECTRICAL MACHINE
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    FR3069980B1|2019-08-09|ROTATING ELECTRIC MACHINE HAVING A LIQUID DEFLECTOR
    EP3758198A1|2020-12-30|Rotary electric motor provided with cooling fins
    FR3088498A1|2020-05-15|STATOR BODY PROVIDED WITH AN ELECTROTECHNICAL HEAD OF REDUCED THICKNESS
    FR3083388A1|2020-01-03|ROTATING ELECTRIC MACHINE COMPRISING A STATOR ELASTICALLY MOUNTED BETWEEN TWO BEARINGS
    WO2021197770A1|2021-10-07|Cover for a rotating electric machine
    FR3104335A1|2021-06-11|Pole wheel for rotating electric machine rotor
    FR3090238A1|2020-06-19|ANTI-ROTATION SYSTEM FOR A STATOR AND A ROTATING ELECTRIC MACHINE HOUSING
    FR3090759A1|2020-06-26|Fan comprising an elastic holding member
    FR3111488A1|2021-12-17|Electric motor with rotor decoupling ring, for ventilation device of a ventilation, air conditioning and / or heating installation of a motor vehicle
    FR3065845A1|2018-11-02|ROTATING ELECTRIC MACHINE WITH SAFETY PICOTS
    FR3062968A1|2018-08-17|ROTOR OF ROTATING ELECTRIC MACHINE WITH MAGNETIC ELEMENT SUPPORT
    同族专利:
    公开号 | 公开日
    FR3069724B1|2020-07-17|
    WO2019020730A1|2019-01-31|
    EP3659238A1|2020-06-03|
    CN110945750A|2020-03-31|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2632861A|1951-03-16|1953-03-24|Gen Electric|Frame structure for dynamo-electric machines|
    US20020135244A1|2001-03-21|2002-09-26|Strong Scott Lewis|Brushless D.C. motor|
    JP2010057309A|2008-08-29|2010-03-11|Toyota Motor Corp|Rotating electrical machine|
    US20120183422A1|2011-01-13|2012-07-19|Visteon Global Technologies, Inc.|Retainer for a stator of an electric compressor|EP3836368A1|2019-12-12|2021-06-16|Valeo Equipements Electriques Moteur|Rotating electrical machine comprising an elastic member|FR2727807B1|1994-12-02|1997-01-17|Valeo Equip Electr Moteur|ROTATING ELECTRIC MACHINE, AND PARTICULARLY A MOTOR VEHICLE ALTERNATOR, INCLUDING IMPROVED MEANS OF ELASTIC MOUNTING OF THE STATOR|
    JP4092195B2|2000-10-06|2008-05-28|ヴァレオエキプマンエレクトリクモトゥール|Rotating electric machine having a stator that is telescopically mounted in a thermally conductive resin, and an automotive alternator|
    JP6127794B2|2013-07-18|2017-05-17|株式会社デンソー|Rotating electric machine stator|CN112513484A|2018-07-17|2021-03-16|圣戈班性能塑料万科有限公司|Tolerance ring and assembly with tolerance ring|
    DE102020118191A1|2020-06-24|2021-12-30|Bitzer Kühlmaschinenbau Gmbh|Refrigerant compressor|
    EP3929436A1|2020-06-24|2021-12-29|BITZER Kühlmaschinenbau GmbH|Refrigerant compressor|
    法律状态:
    2019-02-01| PLSC| Search report ready|Effective date: 20190201 |
    2019-07-31| PLFP| Fee payment|Year of fee payment: 3 |
    2020-07-31| PLFP| Fee payment|Year of fee payment: 4 |
    2021-07-29| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1757116|2017-07-27|
    FR1757116A|FR3069724B1|2017-07-27|2017-07-27|ROTATING ELECTRIC MACHINE COMPRISING AN ELASTIC MEMBER|FR1757116A| FR3069724B1|2017-07-27|2017-07-27|ROTATING ELECTRIC MACHINE COMPRISING AN ELASTIC MEMBER|
    PCT/EP2018/070252| WO2019020730A1|2017-07-27|2018-07-26|Rotary electric machine comprising an elastic member|
    CN201880048960.1A| CN110945750A|2017-07-27|2018-07-26|Rotating electrical machine comprising an elastic component|
    EP18742815.6A| EP3659238A1|2017-07-27|2018-07-26|Rotary electric machine comprising an elastic member|
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