EP3659238A1 - Machine électrique tournante comportant un organe élastique - Google Patents
Machine électrique tournante comportant un organe élastiqueInfo
- Publication number
- EP3659238A1 EP3659238A1 EP18742815.6A EP18742815A EP3659238A1 EP 3659238 A1 EP3659238 A1 EP 3659238A1 EP 18742815 A EP18742815 A EP 18742815A EP 3659238 A1 EP3659238 A1 EP 3659238A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- elastic member
- stator
- machine according
- bosses
- alternator
- 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.)
- Withdrawn
Links
- 239000007769 metal material Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 description 10
- 238000013016 damping Methods 0.000 description 9
- 230000005284 excitation Effects 0.000 description 5
- 210000000078 claw Anatomy 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 150000002894 organic compounds Chemical class 0.000 description 4
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000000872 buffer Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/0829—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial loading of both hub and shaft by an intermediate ring or sleeve
- F16D1/0835—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial loading of both hub and shaft by an intermediate ring or sleeve due to the elasticity of the ring or sleeve
Definitions
- the present invention relates to an elastic member for a rotating electrical machine equipping a motor vehicle and a rotating electrical machine comprising such an elastic member.
- a motor vehicle with a combustion engine is equipped with an alternator whose function is to transform the mechanical energy from the engine into electrical energy, in particular for the purpose of recharging the vehicle battery and supplying the vehicle's on-board electrical system.
- the alternator comprises a rotor mounted on a shaft rotated and a stator surrounding the rotor, the stator being carried by a housing.
- the rotor When the alternator is in operation, the rotor generates a rotating magnetic field that acts on the stator and causes it to vibrate. Depending on the rotational speed of the alternator, the stator vibrations may generate a magnetic noise that is manifested as a hissing sound, causing hearing discomfort.
- 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, a resilient 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 present 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 electrical machine. Therefore, its implementation is quick to implement and does not require waiting time unlike the case of the resin used in the prior art.
- the elastic member is formed of a multilayer material.
- multilayer material is meant that the elastic member is formed of a succession of layers of different materials, these layers succeeding one another in the radial direction.
- the elastic member is formed of at least two different materials.
- the elastic member is formed of three different materials.
- the elastic member is formed of a succession of layers of different materials with different properties.
- At least two layers have different radial stiffness.
- At least one layer is metallic.
- At least one layer is formed of an organic compound.
- a layer formed of an organic compound has a higher damping modulus than a layer formed of a metallic material.
- a layer of damping material is between two layers of metallic materials.
- the elastic member makes it possible both to filter and to damp the vibrations of the stator, in the radial direction.
- the elastic member extends circumferentially around the stator.
- the elastic member has a plane of symmetry, said plane of symmetry comprising the axis of rotation.
- the elastic member may also have a second plane of symmetry extending perpendicularly to the axis of rotation.
- the elastic member has a cross section relative to the axis, the cross section being open.
- the first plane of symmetry passes through the opening and in particular the center in a circumferential direction of said opening.
- the elastic member forms an arc having an angle of at least 240 °.
- the elastic member has a wavy shape.
- the corrugation is performed in the direction of positioning of said member between the housing and the stator.
- the corrugation can thus be radial if the elastic member is positioned radially between the casing and the stator.
- the corrugation may be axial if the elastic member is positioned axially between the housing and the stator.
- the elastic member comprises bosses.
- the bosses extend in particular in a radial direction.
- the elastic member having an inner surface oriented towards the reference axis and an outer surface opposite to the inner surface, the outer surface and / or the inner surface being provided with bosses.
- each boss has a height, in a radial direction, preferably between 0.5 mm and 30 mm.
- each boss has a bearing surface that extends axially.
- the elastic member comprises at least one opening disposed adjacent to one of the bosses.
- the elastic member has openings disposed on either side of at least one boss.
- the aperture extends in an axial direction.
- the opening extends in a circumferential direction.
- the elastic member comprises at least one opening on the boss.
- the elastic member comprises an opening made to separate the boss in two parts preferably having identical dimensions.
- the opening extends in an axial direction.
- the opening extends in a circumferential direction.
- the elastic member has a thickness, in a radial direction, of between 0.1 mm and 1 mm.
- the stator comprises a body extending axially on a first length, the elastic member extending axially on a second length of between 10% and 120% of the first length.
- the machine comprises a second elastic member extending between the stator and the housing in an axial direction and being shaped to present a stiffness in the axial direction intended to filter vibrations of the stator.
- This second elastic member may come in addition to the first elastic member for damping the transmission of vibrations in a second direction, particularly axial.
- 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 driving member of the rotating electrical machine.
- FIG. 1 is a schematic longitudinal sectional view of an alternator, according to one embodiment of the invention.
- FIG. 2 is a schematic perspective view of a first example of a resilient member equipping the alternator of FIG. 1;
- FIG. 3 is an enlarged view of the bosses of the elastic member of FIG. 2;
- Figure 4A shows a first embodiment of the bosses of Figure 3;
- Figure 4B shows a second embodiment of the bosses of Figure 3;
- Figure 5 shows a third embodiment of the bosses of Figure 3.
- FIG. 6 is a schematic perspective view of a second example of a resilient member equipping the alternator of FIG. 1;
- FIGS. 7A and 7B show magnetic noise variation curves of the alternator of FIG. 1 and of an alternator of the prior art as a function of the rotational speed of the alternator, respectively without and with a phase preheating the alternator;
- FIG. 8 is a schematic perspective view of a third example of elastic member according to the invention.
- a motor vehicle with a 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 heat engine into energy. electric in particular to recharge the vehicle battery and electrically power the vehicle on-board network.
- a rotating electrical machine such as an alternator or an alternator-starter
- An alternator / starter is a reversible alternator, that is to say that it also has a mode of operation in which it transforms electrical energy into mechanical energy to start the engine of the motor vehicle.
- the rotating machine behaves like an electric motor.
- the alternator 10 comprises a rotor 12 rotatably mounted on a shaft 13 and a stator 15 surrounding the rotor 12.
- the rotor 12 and the stator 15 are arranged inside a housing 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.
- the stator 15 comprises a body 27 formed of a stack of sheets each having a generally annular shape. Notches are provided at the inner 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 disposed on either side of the body 27 of the stator 15.
- the body 27 of the stator 15 has a generally cylindrical annular shape defined by a front face disposed facing the front bearing 16, a rear face disposed facing the rear bearing 17, an inner cylindrical surface and a external cylindrical surface.
- the front and rear faces of the body 27 of the stator 15 are transverse to the longitudinal axis X.
- the rotor 12 comprises two pole wheels 31 each comprising a flange 32 disposed transversely with respect to the longitudinal axis X and provided with claws 33 extending axially around the periphery of the flange.
- the claws 33 of one of the pole wheels 31 are angularly offset relative to the claws 33 of the other pole wheel 31 so that the claws 43 of the two pole wheels 31 reciprocally engage.
- a cylindrical core 34 is interposed axially between the flanges 32 of the pole wheels 31.
- the core 34 consists of two half-cores each belonging to one of the flanges 32.
- This core 34 carries at its outer periphery an 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 powered by an electrical excitation current from a voltage regulator.
- the slip rings 21 are disposed on the rear end of the shaft 13.
- the cooling of the alternator 10 is ensured by an air flow generated by two fans 25, 26 respectively disposed 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 housing 1 January.
- the elastic member 40 is disposed between the stator 15 and a single bearing, in this case the front bearing 16, to facilitate assembly.
- the elastic member can mechanically connect the stator to the rear bearing or both bearings at a time.
- the elastic member 40 is shaped to filter the vibrations of the stator resulting from the electromagnetic forces present in the alternator 10 when in operation.
- the elastic member 40 limits the propagation of the vibrations of the stator 15 to the casing 1 1 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 shown in FIG. 2.
- the elastic member 40 is mounted around the outer cylindrical surface of the body 27 of the stator 15.
- the elastic member 40 has an inner surface 41 disposed facing, and preferably in contact with, the outer cylindrical surface of the body 27 of the stator 15, and an outer surface 42 opposite to the inner surface 41.
- the elastic member 40 has bosses 44 extending radially outwardly on the outer surface 42.
- the inner 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 housing 1 1.
- the bosses 44 of the elastic member 40 are more clearly visible in FIG. 3.
- the bosses can be reversed, that is to say be arranged on the inner peripheral surface 41.
- 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 the housing 1 1 so as to prevent the stator 15 to move axially and / or radially and / or rotational relative to the housing 1 1.
- the bosses 44 of the elastic member 40 thus allow the stator 15 to be held in position in the housing 1 1.
- 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 may extend over an axial length less than that of the stator body or, alternatively, 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 0.1 mm and 1 mm.
- Each boss 44 has a bearing surface 47 disposed in contact with the casing January 1 if the bosses are disposed on an outer circumferential face of the resilient member or in contact with the body 27 of the stator if the bosses are disposed on an inner circumferential face of said member.
- the elastic member may comprise bosses located respectively on the inner and outer faces of said member. The arrangement of the bosses on one side or the other may depend on the assembly method of the alternator in the sense that the bearing surface 47 is in particular in contact with the part (housing or stator) movable during mounting of the stator in the crankcase. The elastic member is therefore mounted, especially before assembly between the stator and the housing, on the immobile part during this assembly.
- each boss 44 extends axially over a length L preferably between 20% and 1 10% of the length LS of the body 27 of the stator 15.
- Each boss 44 has a height H, considered according to a radial direction between the inner surface 41 and the bearing surface 27, preferably between 0.5 mm and 30 mm.
- each boss 44 has for example a width, in a circumferential direction, preferably between 0.2 mm and 30 mm.
- the bosses of the same elastic member 40 are all identical along the circumference of said member.
- the bosses may be evenly distributed along the circumference of the elastic member or not regularly distributed.
- groups of several bosses can be regularly distributed to each other, in this case in the figures groups of two bosses are represented.
- the elastic member 40 has a cross section relative to the X axis 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 makes it possible to ensure the centering of the stator 15 relative to the housing 1 1.
- the elastic member 40 may be made of metal such as steel or aluminum.
- metal such as steel or aluminum.
- One advantage of using metal is to obtain a good thermal conduction between the stator 15 and the housing 1 1 so as to remove the heat resulting from the generation of the current induced in the stator.
- the elastic member 40 may comprise openings 48 disposed on either side of each boss 44.
- the elastic member 40 may comprise a single boss opening 44, for example arranged in the middle of the boss.
- a boss 44 may be formed of several strips spaced apart by openings.
- each boss 44 may comprise an additional opening 48, as represented in FIG. 4B, made to separate the boss 44 in two parts preferably having identical dimensions.
- the various openings that comprise the elastic member 40, 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 sufficiently rigid to maintain in position the stator 15 in the housing 1 1 while being flexible enough to filter the vibrations.
- the elastic member 40 may be formed of a multilayer material 60.
- multilayer material is meant that the elastic member is formed of a succession of layers of different materials, these layers succeeding one another in the radial direction.
- the elastic member comprises bosses 44 and is formed of three layers 61, 62, 61.
- the upper and lower layers 61 are formed of a metallic material, and the intermediate layer 62 is formed of an organic compound.
- the metal layers can be made of steel, aluminum, copper, brass or other.
- the intermediate layer may be made of rubber, polymeric foams or the like.
- the intermediate layer, formed of an organic compound, has a higher damping modulus than the two layers formed of a metallic material.
- the elastic member makes it possible both to filter and to damp the vibrations of the stator, in the radial direction.
- FIG. 7A shows a first curve 601 of variation of the magnetic noise BM as a function of the rotation speed 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 preheating phase before the realization of the measure.
- the magnetic noise BM is expressed in dB (A) w acoustic decibel and the rotational speed is expressed in revolutions per minute rpm.
- a decrease in magnetic noise BM is noted at least in a speed range between 1800 rpm and 5200 rpm.
- the range of speeds between 1800 rpm and 4000 rpm is particularly interesting because it is in it that the magnetic noise is the most audible and therefore the most troublesome. Indeed, beyond this range, the aeraulic noise fans providing cooling of the alternator covers the magnetic noise.
- FIG. 7B shows a third curve 603 for the variation of the magnetic noise BM as a function of the rotation speed V of the alternator according to the prior art and a second curve 604 for the variation of the magnetic noise BM. according to the rotation speed V of the alternator 10 according to the invention.
- these two curves 603, 604 are obtained when the alternator has undergone a preheating phase, also for an ambient temperature of about 25 ° C. It can also be seen that in the speed range V between 1800 rpm and 4000 rpm the magnetic noise is reduced or remains approximately equal.
- FIG. 8 shows another example of a second elastic member 50 that 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 may be assembled axially between each face of the body 27 of the stator 15 and the bearing 16, 17 corresponding so that the axis of revolution coincides with the axis of rotation X.
- the alternator 10 may comprise two second elastic members 50.
- the elastic member 50 has corrugations 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.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1757116A FR3069724B1 (fr) | 2017-07-27 | 2017-07-27 | Machine electrique tournante comportant un organe elastique |
| PCT/EP2018/070252 WO2019020730A1 (fr) | 2017-07-27 | 2018-07-26 | Machine électrique tournante comportant un organe élastique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3659238A1 true EP3659238A1 (fr) | 2020-06-03 |
Family
ID=60765723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18742815.6A Withdrawn EP3659238A1 (fr) | 2017-07-27 | 2018-07-26 | Machine électrique tournante comportant un organe élastique |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP3659238A1 (fr) |
| CN (1) | CN110945750A (fr) |
| FR (1) | FR3069724B1 (fr) |
| WO (1) | WO2019020730A1 (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112513484B (zh) * | 2018-07-17 | 2023-05-02 | 圣戈班性能塑料万科有限公司 | 公差环和具有公差环的组件 |
| FR3104850B1 (fr) | 2019-12-12 | 2022-06-03 | Valeo Equip Electr Moteur | Machine électrique tournante comportant un organe élastique |
| EP3929436B1 (fr) * | 2020-06-24 | 2024-02-21 | BITZER Kühlmaschinenbau GmbH | Compresseur de réfrigérant |
| DE102020118191A1 (de) | 2020-06-24 | 2021-12-30 | Bitzer Kühlmaschinenbau Gmbh | Kältemittelverdichter |
| DE102022209587A1 (de) | 2022-09-13 | 2024-03-14 | Robert Bosch Gesellschaft mit beschränkter Haftung | Stator für eine elektrische Maschine, eine elektrische Maschine und Verfahren zum Herstellen eines solchen Stators |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150022052A1 (en) * | 2013-07-18 | 2015-01-22 | Denso Corporation | Stator for rotating electric machine |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2632861A (en) * | 1951-03-16 | 1953-03-24 | Gen Electric | Frame structure for dynamo-electric machines |
| FR2727807B1 (fr) * | 1994-12-02 | 1997-01-17 | Valeo Equip Electr Moteur | Machine electrique tournante, et notamment alternateur de vehicule automobile, comportant des moyens perfectionnes de montage elastique du stator |
| US6798094B2 (en) | 2000-10-06 | 2004-09-28 | Valeo Equipements Electriques Moteur | Rotary electric machine, and in particular motor vehicle alternator, comprising a stator elastically mounted in a heat-conductive resin |
| US20020135244A1 (en) * | 2001-03-21 | 2002-09-26 | Strong Scott Lewis | Brushless D.C. motor |
| JP2010057309A (ja) * | 2008-08-29 | 2010-03-11 | Toyota Motor Corp | 回転電機 |
| US20120183422A1 (en) * | 2011-01-13 | 2012-07-19 | Visteon Global Technologies, Inc. | Retainer for a stator of an electric compressor |
-
2017
- 2017-07-27 FR FR1757116A patent/FR3069724B1/fr active Active
-
2018
- 2018-07-26 CN CN201880048960.1A patent/CN110945750A/zh active Pending
- 2018-07-26 EP EP18742815.6A patent/EP3659238A1/fr not_active Withdrawn
- 2018-07-26 WO PCT/EP2018/070252 patent/WO2019020730A1/fr not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20150022052A1 (en) * | 2013-07-18 | 2015-01-22 | Denso Corporation | Stator for rotating electric machine |
Also Published As
| Publication number | Publication date |
|---|---|
| FR3069724B1 (fr) | 2020-07-17 |
| CN110945750A (zh) | 2020-03-31 |
| WO2019020730A1 (fr) | 2019-01-31 |
| FR3069724A1 (fr) | 2019-02-01 |
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