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EP3231065A1 - Electric machine - Google Patents

Electric machine

Info

Publication number
EP3231065A1
EP3231065A1 EP15821117.7A EP15821117A EP3231065A1 EP 3231065 A1 EP3231065 A1 EP 3231065A1 EP 15821117 A EP15821117 A EP 15821117A EP 3231065 A1 EP3231065 A1 EP 3231065A1
Authority
EP
European Patent Office
Prior art keywords
stator
machine
electric machine
electrical machine
compression
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Withdrawn
Application number
EP15821117.7A
Other languages
German (de)
French (fr)
Inventor
Franck Giraud
Jean-Philippe Badey
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 Electrification
Original Assignee
Valeo Systemes de Controle Moteur SAS
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Valeo Systemes de Controle Moteur SAS filed Critical Valeo Systemes de Controle Moteur SAS
Publication of EP3231065A1 publication Critical patent/EP3231065A1/en
Withdrawn legal-status Critical Current

Links

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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/02—Drives of pumps; Varying pump drive gear ratio
    • F02B39/08—Non-mechanical drives, e.g. fluid drives having variable gear ratio
    • F02B39/10—Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/223—Heat bridges
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/02—Synchronous motors
    • H02K19/10—Synchronous motors for multi-phase current
    • H02K19/103—Motors having windings on the stator and a variable reluctance soft-iron rotor without windings

Definitions

  • the present invention relates to the field of electrical machines, and more particularly relates to electric machines for electric compressor, and for example an electric supercharger.
  • An electric machine is a machine, also called a motor, which has at least one stator.
  • the stator has teeth around which the coils are surrounded.
  • the supply of each of the coils allows the creation of a magnetic field in the stator, a rotor oriented along the field lines.
  • these electrical machines are for example used in electric compressors.
  • these machines are used on the air intake circuit to improve the efficiency of the vehicle, to overcome the latency of the conventional turbocharger at startup, or in the transient phases of the vehicle.
  • this type of machine is a source of noise.
  • the vibrations of the motor can interfere with the resonance frequency of the machine and generate additional vibrations and thus micro-displacements at high frequency and in the audible range of the human ear.
  • the vibrations are transmitted throughout the structure of the machine, and propagate in the air and in the supports of the machine. If the noise from the machine to the support can be reduced by dampers, the noise intrinsic to the machine is more difficult to deal with.
  • One solution to this noise is to reduce the effects of radial forces.
  • the effects of radial forces are reduced, for example, by providing material recesses on the outer face of the stator, in the extension of the stator teeth.
  • Such a solution allows a gain of deformation, to reduce the radial forces on the workpiece in contact with the stator. This gain contributes to the partial reduction of noise, which is still audible by a human ear.
  • the present invention therefore aims to overcome one or more of the disadvantages of the machines of the prior art by providing an electrical machine configured to limit noise.
  • the present invention proposes an electric machine, comprising at least one stator, and noise reduction means comprising at least acoustic insulation means of the stator relative to the rest of the electrical machine.
  • the acoustic insulation means are axial isolation means.
  • the axial isolation means are formed by at least two joints arranged at the axial ends 610 of the stator.
  • At least a portion of the seal is in compression with the surface of the end of the stator.
  • the number of portions in compression is determined as a function of the stator mass.
  • the compression portion is made by the joint itself.
  • the compression portion is made by a complementary piece which compresses some local areas of the joint.
  • the machine comprises radial heat dissipation means are formed by resin covering at least a portion of the outer radial surface of the stator.
  • the invention also relates to the use of the electric machine according to the invention in an electric supercharger for a motor vehicle.
  • the invention also relates to an electric supercharger equipped with an electric machine according to the invention.
  • FIG. 1 is a schematic representation of a cross-sectional view of the device concerned by the present invention
  • FIG. 2 is a schematic representation of a longitudinal sectional view of the device according to the invention integrated in an electric compressor
  • FIG. 3 is a schematic representation of a detail A of FIG. 3 according to the invention.
  • FIG. 4 is a schematic representation of the additional piece according to the invention.
  • FIG. 5 is a schematic representation of a variant of an axial sound insulation means according to the invention.
  • the present invention relates to an electric machine 1.
  • the electric machine 1 comprises at least one stator 2, illustrated in FIGS. 1 and 3.
  • the electric machine also comprises a rotor 3 disposed inside the stator 2. More precisely, the rotor 3 is disposed in a space 4 formed in the center of the stator 2.
  • the stator is disposed in a recess formed in the body 110 of the electric machine, illustrated in FIG.
  • the electrical machine is a continuous or alternating current machine, synchronous, or any type of electric machine of the same type.
  • the electrical machine is a variable reluctance motor (also called SRM machine for Switched Reluctance Motor according to English terminology).
  • the electric machine is a permanent magnet motor.
  • the stator 2 is formed of at least one body 21. According to one embodiment of the invention, the stator is in one piece. According to one embodiment of the invention, the stator is formed of several bodies. The stator is also formed of several teeth 22. The teeth 22 are disposed on the internal face 221 of the stator body delimiting the space 4 in which the rotor is located. The stator 2 has n teeth 22, n being greater than or equal to 4, preferably between 4 and 20, preferably between 4 and 12, and very preferably equal to 6. Around each of the teeth 22 is arranged a winding which thus forms the coils 23 of the stator. The supply of each of the coils 23 allows the creation of a magnetic field in the stator 2.
  • the rotor 3 comprises rotor teeth 32 oriented along the field lines of the stator 2.
  • the number of teeth of the rotor 3 is between 2 and 8, and preferably is equal to 4.
  • the noise reduction means comprise acoustic insulation means of the stator relative to the rest of the electrical machine.
  • the axial sound insulation means 6, 61 “are formed by at least two seals 6, 61" disposed at the radial ends 610 of the stator 2.
  • the axial ends 610 of the stator correspond to both external surfaces of the stator 2 arranged perpendicular to the axis 31 of the stator 2.
  • the longitudinal axis 31 of the stator is defined as the axis 31 along which the stator extends, passing through the center of the stator, that is to say the axis 31 around which is disposed the stator and the axis of rotation of the rotor.
  • the seals 6, 61 are elastomer seals.
  • the seals are of the fluoroelastomer type (FKM, peroxide FKM) hydrogenated nitrile rubbers (HNBR for hydrogenated nitrile butadiene rubber according to English terminology ) or ethylene-propylene-diene monomer (EPDM).
  • FKM fluoroelastomer type
  • HNBR hydrogenated nitrile rubbers
  • EPDM ethylene-propylene-diene monomer
  • the joints 61 ', 61 are arranged at the periphery of the surface 610 forming the ends of the stator 2.
  • the term compression portion a compression point of the seal against the surface 600 of the end of the stator. That is to say an area whose contact pressure is higher than the other areas of contact of the seal with the surface of the end of the stator.
  • the number of portions in compression is determined as a function of the stator mass. That is, the higher the mass, the more points of contact may be required.
  • At least six portions of the gasket 6, 61 are in compression with the surface of the end of the stator.
  • At least eight portions of the seal 61 ' are provided.
  • the compression portion is made by the gasket 6, 61 "itself, that is to say that the gasket has relief elements 611 allowing a greater contact with the surface 160 of the end of the stator 2.
  • the raised elements 611 are protuberances which have all forms to ensure contact with the surface of the end of the stator
  • the relief elements are shaped hump, cone or plane.
  • the compression portion is made by a complementary part 7 which locally compresses certain zones of the gasket 6, 61. More specifically, the complementary piece 7 comes to press the gasket 6, 61 against the end surface 160 of the stator 2. The plating is made more strongly in certain areas, it is the portions of compressions.
  • the complementary piece 7 is a circular piece 71 whose diameter is adapted so that the piece cooperates with the seal 61 ',
  • the complementary piece 7 comprises raised zones 72. It is these zones 72 which, when the complementary piece 7 is pressed against the gasket 6, 61 ", exerts a complementary pressure on certain zones.
  • the areas in relief are for example bumps, cones or plane.
  • the complementary piece 7 is made of aluminum.
  • the complementary piece 7 is any part making it possible to achieve these points of compression.
  • the electric machine 1 comprises heat transfer means 5. More specifically, the heat transfer means 5 are radial heat dissipation means.
  • the heat dissipation means 5 are formed by resin covering the outer radial surface of the stator 2.
  • the radial surface of the stator is the outer face 222 of the stator 2. This is the face which does not have a tooth 22 and which is disposed outside the stator 2 if we consider the internal face 221 of the stator delimits an area 4 of the stator 2 in which the rotor 3 is placed.
  • the resin 5 completely bridges the gap between the radial surface of the stator 2 and the body 110 of the electric machine 1.
  • the resin fills a portion of the vacuum between the radial surface of the stator 2 and the body 110 of the electric machine 1. More specifically, one or more portions of the vacuum are filled by the resin.
  • the hardness and the damping coefficient of the resin are chosen so that it does not interfere with the radial forces, so as not to increase the noise caused by the machine, but that it allows a sufficient heat transfer. Indeed, it is important that the heat of the electric machine is not stored in the electric machine but is dissipated to the outside. This prevents overheating of the machine, including its electronic system.
  • the resin is a flexible resin.
  • the resin has a hardness less than or equal to 80 shore A, preferably less than or equal to 60 shore A, very preferably less than or equal to 40 shore A.
  • the electric machine when the stator 2 is formed of several parts, the electric machine comprises an aluminum ring 120 disposed between the stator 2 and the resin 5.
  • Such an electric machine according to the invention allows a gain of 5 to 15 dB depending on the rotational speed of the engine of the vehicle in which the machine is used.
  • the noise emitted by the electric machine is thus no longer considered a noise nuisance for the human ear.
  • the invention also relates to the use of such a machine according to the invention in an electric supercharger compressor 10 for a motor vehicle.
  • the invention also relates to an electric supercharger compressor 10 equipped with such a machine 1 according to the invention. More specifically, the invention also relates to an electric compressor 10 equipped with a variable reluctance motor according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

The present invention relates to an electric machine comprising at least one stator (2), and noise reduction means comprising at least acoustic insulation means (61', 61") of the stator (2) with respect to the remainder of the electric machine (1).

Description

MACHINE ELECTRIQUE  ELECTRIC MACHINE
La présente invention se rapporte au domaine des machines électriques, et se rapporte plus particulièrement aux machines électriques pour compresseur électrique, et par exemple un compresseur de suralimentation électrique. The present invention relates to the field of electrical machines, and more particularly relates to electric machines for electric compressor, and for example an electric supercharger.
Une machine électrique est une machine, également appelée moteur, qui comporte au moins un stator. Le stator comporte des dents autour desquelles sont entourées les bobines. L'alimentation de chacune des bobines permet la création d'un champ magnétique dans le stator, un rotor s'orientant suivant les lignes de champ.  An electric machine is a machine, also called a motor, which has at least one stator. The stator has teeth around which the coils are surrounded. The supply of each of the coils allows the creation of a magnetic field in the stator, a rotor oriented along the field lines.
Dans le domaine de l'automobile, ces machines électriques sont par exemple utilisées dans des compresseurs électriques. Par exemple, ces machines sont utilisées sur le circuit d'admission d'air pour améliorer le rendement du véhicule, pallier le temps de latence du turbocompresseur classique au démarrage, ou dans les phases transitoires du véhicule.  In the automotive field, these electrical machines are for example used in electric compressors. For example, these machines are used on the air intake circuit to improve the efficiency of the vehicle, to overcome the latency of the conventional turbocharger at startup, or in the transient phases of the vehicle.
Cependant, ce type de machine est source de bruit. En effet, les vibrations du moteur peuvent interférer avec la fréquence de résonnance de la machine et engendrer des vibrations supplémentaires et ainsi des micro-déplacements à haute fréquence et dans le domaine audible de l'oreille humaine. Les vibrations se transmettent sur toute la structure de la machine, et se propagent dans l'air et dans les supports de la machine. Si les bruits conduits par la machine vers le support peuvent être réduits par des amortisseurs, les bruits intrinsèques à la machine sont plus difficiles à traiter.  However, this type of machine is a source of noise. Indeed, the vibrations of the motor can interfere with the resonance frequency of the machine and generate additional vibrations and thus micro-displacements at high frequency and in the audible range of the human ear. The vibrations are transmitted throughout the structure of the machine, and propagate in the air and in the supports of the machine. If the noise from the machine to the support can be reduced by dampers, the noise intrinsic to the machine is more difficult to deal with.
Une solution à ce bruit, consiste à réduire les effets des efforts radiaux. Les effets des efforts radiaux sont réduits, par exemple, en aménageant des évidements de matière sur la face externe du stator, dans le prolongement des dents du stator. Une telle solution permet un gain de déformation, permettant de réduire les efforts radiaux sur la pièce en contact avec le stator. Ce gain participe à la réduction partielle du bruit, qui reste ainsi encore audible par une oreille humaine.  One solution to this noise is to reduce the effects of radial forces. The effects of radial forces are reduced, for example, by providing material recesses on the outer face of the stator, in the extension of the stator teeth. Such a solution allows a gain of deformation, to reduce the radial forces on the workpiece in contact with the stator. This gain contributes to the partial reduction of noise, which is still audible by a human ear.
La présente invention a donc pour objet de pallier un ou plusieurs des inconvénients des machines de l'art antérieur en proposant une machine électrique configurée pour limiter les nuisances sonores. Pour cela la présente invention propose une machine électrique, comportant au moins un stator, et des moyens de réduction du bruit comprenant au moins des moyens d'isolation acoustiques du stator par rapport au reste de la machine électrique. The present invention therefore aims to overcome one or more of the disadvantages of the machines of the prior art by providing an electrical machine configured to limit noise. For this, the present invention proposes an electric machine, comprising at least one stator, and noise reduction means comprising at least acoustic insulation means of the stator relative to the rest of the electrical machine.
En effet, il a été mis en évidence que l'utilisation de moyens d'isolation acoustique axiale 6 , 61" permet de réduire les nuisances sonores d'au moins 15 db.  Indeed, it has been demonstrated that the use of axial sound insulation means 6, 61 "reduces noise nuisance of at least 15 db.
Selon un mode de réalisation de l'invention, les moyens d'isolation acoustique sont des moyens d'isolation axiale.  According to one embodiment of the invention, the acoustic insulation means are axial isolation means.
Selon un mode de réalisation de l'invention, les moyens d'isolation axiale sont formés par au moins deux joints disposés aux extrémités axiales 610 du stator.  According to one embodiment of the invention, the axial isolation means are formed by at least two joints arranged at the axial ends 610 of the stator.
Selon un mode de réalisation de l'invention, au moins une portion du joint est en compression avec la surface de l'extrémité du stator.  According to one embodiment of the invention, at least a portion of the seal is in compression with the surface of the end of the stator.
Selon un mode de réalisation de l'invention, le nombre de portion en compression est déterminé en fonction de la masse du stator.  According to one embodiment of the invention, the number of portions in compression is determined as a function of the stator mass.
Selon un mode de réalisation de l'invention, la portion de compression est réalisée par le joint lui même.  According to one embodiment of the invention, the compression portion is made by the joint itself.
Selon un mode de réalisation de l'invention, la portion de compression est réalisée par une pièce complémentaire qui vient comprimer localement certaines zones du joint.  According to one embodiment of the invention, the compression portion is made by a complementary piece which compresses some local areas of the joint.
Selon un mode de réalisation de l'invention, la machine comporte des moyens de dissipation thermique radiaux sont formés par de la résine recouvrant au moins une partie de la surface radiale extérieure du stator.  According to one embodiment of the invention, the machine comprises radial heat dissipation means are formed by resin covering at least a portion of the outer radial surface of the stator.
L'invention concerne également, l'utilisation de la machine électrique selon l'invention dans un compresseur de suralimentation électrique pour véhicule automobile.  The invention also relates to the use of the electric machine according to the invention in an electric supercharger for a motor vehicle.
L'invention concerne également, un compresseur de suralimentation électrique équipé d'une machine électrique selon l'invention.  The invention also relates to an electric supercharger equipped with an electric machine according to the invention.
D'autres buts, caractéristiques et avantages de l'invention seront mieux compris et apparaîtront plus clairement à la lecture de la description faite, ci-après, en se référant aux figures annexées, données à titre d'exemple et dans lesquelles: Other objects, features and advantages of the invention will be better understood and will appear more clearly on reading the description given hereinafter with reference to the appended figures given by way of example and in which:
- la figure 1 est une représentation schématique d'une vue en coupe transversale du dispositif concerné par la présente invention, - la figure 2 est une représentation schématique d'une vue en coupe longitudinale du dispositif selon l'invention intégré dans un compresseur électrique, FIG. 1 is a schematic representation of a cross-sectional view of the device concerned by the present invention, FIG. 2 is a schematic representation of a longitudinal sectional view of the device according to the invention integrated in an electric compressor,
- la figure 3 est une représentation schématique d'un détail A de la figure 3 selon l'invention,  FIG. 3 is a schematic representation of a detail A of FIG. 3 according to the invention,
- la figure 4 est une représentation schématique de la pièce supplémentaire selon l'invention,  FIG. 4 is a schematic representation of the additional piece according to the invention,
- la figure 5 est une représentation schématique d'une variante d'un moyen d'isolation acoustique axiale selon l'invention.  FIG. 5 is a schematic representation of a variant of an axial sound insulation means according to the invention.
La présente invention concerne une machine électrique 1. La machine 1 électrique comporte au moins un stator 2, illustré figure 1 et 3. La machine électrique comporte également un rotor 3 disposé à l'intérieur du stator 2. Plus précisément, le rotor 3 est disposé dans un espace 4 formé au centre du stator 2.  The present invention relates to an electric machine 1. The electric machine 1 comprises at least one stator 2, illustrated in FIGS. 1 and 3. The electric machine also comprises a rotor 3 disposed inside the stator 2. More precisely, the rotor 3 is disposed in a space 4 formed in the center of the stator 2.
Selon un mode de réalisation de l'invention, le stator est disposé dans un évidement formé dans le corps 110 de la machine électrique, illustré figure 3.  According to one embodiment of the invention, the stator is disposed in a recess formed in the body 110 of the electric machine, illustrated in FIG.
Selon un mode de réalisation de l'invention, la machine électrique est une machine à courant continue ou alternatif, synchrone, ou tout type de machine électrique du même type.  According to one embodiment of the invention, the electrical machine is a continuous or alternating current machine, synchronous, or any type of electric machine of the same type.
Selon un mode de réalisation de l'invention, la machine électrique est un moteur à reluctance variable (également appelée machine SRM pour Switched Reluctance Motor selon la terminologie anglaise).  According to one embodiment of the invention, the electrical machine is a variable reluctance motor (also called SRM machine for Switched Reluctance Motor according to English terminology).
Selon un mode de réalisation de l'invention, la machine électrique est un moteur à aimants permanents.  According to one embodiment of the invention, the electric machine is a permanent magnet motor.
Le stator 2 est formé d'au moins un corps 21. Selon un mode de réalisation de l'invention, le stator est monobloc. Selon un mode de réalisation de l'invention, le stator est formé de plusieurs corps. Le stator est également formé de plusieurs dents 22. Les dents 22 sont disposées sur la face interne 221 du corps du stator délimitant l'espace 4 dans lequel se trouve le rotor. Le stator 2 comporte n dents 22, n étant supérieur ou égale à 4, de préférence compris entre 4 et 20, de manière préférée entre 4 et 12, et de manière très préférée égale à 6. Autour de chacune des dents 22 est disposé un bobinage qui forme ainsi les bobines 23 du stator. L'alimentation de chacune des bobines 23 permet la création d'un champ magnétique dans le stator 2. The stator 2 is formed of at least one body 21. According to one embodiment of the invention, the stator is in one piece. According to one embodiment of the invention, the stator is formed of several bodies. The stator is also formed of several teeth 22. The teeth 22 are disposed on the internal face 221 of the stator body delimiting the space 4 in which the rotor is located. The stator 2 has n teeth 22, n being greater than or equal to 4, preferably between 4 and 20, preferably between 4 and 12, and very preferably equal to 6. Around each of the teeth 22 is arranged a winding which thus forms the coils 23 of the stator. The supply of each of the coils 23 allows the creation of a magnetic field in the stator 2.
Selon un mode de réalisation de l'invention, le rotor 3 comporte des dents 32 de rotor orientées suivant les lignes de champ du stator 2. Le nombre de dents du rotor 3 est compris entre 2 et 8, et de manière préférée est égale à 4.  According to one embodiment of the invention, the rotor 3 comprises rotor teeth 32 oriented along the field lines of the stator 2. The number of teeth of the rotor 3 is between 2 and 8, and preferably is equal to 4.
Dans le cadre de l'invention, les moyens de réduction du bruit comprennent des moyens d'isolation acoustique du stator par rapport au reste de la machine électrique.  In the context of the invention, the noise reduction means comprise acoustic insulation means of the stator relative to the rest of the electrical machine.
Selon un mode de réalisation de l'invention, il a été mis en évidence que l'utilisation de moyens d'isolation acoustique axiale 6 , 61" permet de réduire les nuisances sonores de 15 db.  According to one embodiment of the invention, it has been demonstrated that the use of axial sound insulation means 6, 61 "reduces noise nuisance of 15 db.
Selon un mode de réalisation de l'invention, les moyens d'isolation acoustique axiale 6 , 61" sont formés par au moins deux joints 6 , 61" disposés aux extrémités radiales 610 du stator 2. Les extrémités axiales 610 du stator correspondent aux deux surfaces externes du stator 2 disposées perpendiculairement par rapport à l'axe 31 du stator 2.  According to one embodiment of the invention, the axial sound insulation means 6, 61 "are formed by at least two seals 6, 61" disposed at the radial ends 610 of the stator 2. The axial ends 610 of the stator correspond to both external surfaces of the stator 2 arranged perpendicular to the axis 31 of the stator 2.
Dans le cadre de l'invention, l'axe 31 longitudinal du stator est défini comme étant l'axe 31 le long duquel s'étend le stator, passant par le centre du stator, c'est-à-dire l'axe 31 autour duquel est disposé le stator et l'axe de rotation du rotor.  In the context of the invention, the longitudinal axis 31 of the stator is defined as the axis 31 along which the stator extends, passing through the center of the stator, that is to say the axis 31 around which is disposed the stator and the axis of rotation of the rotor.
Selon un mode de réalisation de l'invention, les joints 6 , 61" sont des joints élastomère. Par exemple, les joints sont de type fluoroélastomères (FKM, FKM peroxydé) caoutchoucs nitriie hydrogénés (HNBR pour hydrogenated nitrile butadiene rubber selon la terminologie anglaise) ou éthylène-propylène-diène monomère (EPDM).  According to one embodiment of the invention, the seals 6, 61 "are elastomer seals.For example, the seals are of the fluoroelastomer type (FKM, peroxide FKM) hydrogenated nitrile rubbers (HNBR for hydrogenated nitrile butadiene rubber according to English terminology ) or ethylene-propylene-diene monomer (EPDM).
Selon un mode de réalisation de l'invention, les joints 61', 61" sont disposés en périphérie de la surface 610 formant les extrémités du stator 2.  According to one embodiment of the invention, the joints 61 ', 61 "are arranged at the periphery of the surface 610 forming the ends of the stator 2.
Selon un mode de réalisation de l'invention, au moins une portion du joint 6 , 61" est en compression avec la surface 610 de l'extrémité du stator. Selon un mode de réalisation de l'invention, plusieurs portions du joint 6 , 61" sont en compression avec la surface de l'extrémité du stator. En effet, il a été mis en évidence que la réduction du bruit était plus importante lorsque certaines zones du joint sont comprimées sur la surface de l'extrémité du stator. Dans le cadre de l'invention, on entend par portion en compression, un point de compression du joint contre la surface 600 de l'extrémité du stator. C'est-à-dire une zone dont la pression de contact est plus forte que les autres zones de contact du joint avec la surface de l'extrémité du stator. According to one embodiment of the invention, at least one portion of the seal 6, 61 "is in compression with the surface 610 of the end of the stator According to one embodiment of the invention, several portions of the seal 6, 61 "are in compression with the surface of the end of the stator. Indeed, it has been demonstrated that the noise reduction is greater when certain areas of the seal are compressed on the surface of the end of the stator. In the context of the invention, the term compression portion, a compression point of the seal against the surface 600 of the end of the stator. That is to say an area whose contact pressure is higher than the other areas of contact of the seal with the surface of the end of the stator.
Selon un mode de réalisation de l'invention, le nombre de portion en compression est déterminé en fonction de la masse du stator. C'est-à-dire que plus la masse est élevée, plus il peut être nécessaire d'avoir des points de contact.  According to one embodiment of the invention, the number of portions in compression is determined as a function of the stator mass. That is, the higher the mass, the more points of contact may be required.
Selon un mode de réalisation de l'invention, au moins six portions du joint 6 , 61" sont en compression avec la surface de l'extrémité du stator.  According to one embodiment of the invention, at least six portions of the gasket 6, 61 "are in compression with the surface of the end of the stator.
Selon un mode de réalisation de l'invention, au moins huit portions du joint 61', According to one embodiment of the invention, at least eight portions of the seal 61 ',
61" sont en compression avec la surface 610 de l'extrémité du stator. 61 "are in compression with the surface 610 of the end of the stator.
Selon un mode de réalisation de l'invention, entre 1, c'est-à-dire une couronne 612 complète du joint, et 30 portions du joint 6 , 61" sont en compression avec la surface 610 de l'extrémité du stator.  According to one embodiment of the invention, between 1, that is to say a ring 612 complete seal, and 30 portions of the seal 6, 61 "are in compression with the surface 610 of the end of the stator.
Selon un mode de réalisation de l'invention illustrée figure 5, la portion de compression est réalisée par le joint 6 , 61" lui même. C'est-à-dire que le joint possède des éléments en relief 611 permettant un contact plus important avec la surface 160 de l'extrémité du stator 2. Les éléments en relief 611 sont des protubérances qui ont toutes formes permettant d'assurer le contact avec la surface de l'extrémité du stator. Par exemple, les éléments en relief sont en forme de bosse, de cône ou plane.  According to one embodiment of the invention illustrated in FIG. 5, the compression portion is made by the gasket 6, 61 "itself, that is to say that the gasket has relief elements 611 allowing a greater contact with the surface 160 of the end of the stator 2. The raised elements 611 are protuberances which have all forms to ensure contact with the surface of the end of the stator For example, the relief elements are shaped hump, cone or plane.
Selon un mode de réalisation de l'invention illustrée figure 4, la portion de compression est réalisée par une pièce complémentaire 7 qui vient comprimer localement certaines zones du joint 6 , 61". Plus précisément la pièce complémentaire 7 vient plaquer le joint 6 , 61" contre la surface 160 d'extrémité du stator 2. Le plaquage est réalisé plus fortement au niveau de certaines zones, ce sont les portions de compressions.  According to one embodiment of the invention illustrated in FIG. 4, the compression portion is made by a complementary part 7 which locally compresses certain zones of the gasket 6, 61. More specifically, the complementary piece 7 comes to press the gasket 6, 61 against the end surface 160 of the stator 2. The plating is made more strongly in certain areas, it is the portions of compressions.
Selon un mode de réalisation de l'invention, la pièce complémentaire 7 est une pièce circulaire 71 dont le diamètre est adapté pour que la pièce coopère avec le joint 61', Selon un mode de réalisation de l'invention, la pièce complémentaire 7 comporte des zones en relief 72. Ce sont ces zones 72 qui, lorsque la pièce complémentaire 7 est plaquée contre le joint 6 , 61", exerce une pression complémentaire sur certaines zones du joint et réalise les points de compression. Les zones en relief sont par exemple des bosses, des cônes ou plane. According to one embodiment of the invention, the complementary piece 7 is a circular piece 71 whose diameter is adapted so that the piece cooperates with the seal 61 ', According to one embodiment of the invention, the complementary piece 7 comprises raised zones 72. It is these zones 72 which, when the complementary piece 7 is pressed against the gasket 6, 61 ", exerts a complementary pressure on certain zones. The areas in relief are for example bumps, cones or plane.
Selon un mode de réalisation de l'invention, la pièce complémentaire 7 est en aluminium.  According to one embodiment of the invention, the complementary piece 7 is made of aluminum.
Selon un mode de réalisation de l'invention, la pièce complémentaire 7 est toute pièce permettant de réaliser ces points de compression.  According to one embodiment of the invention, the complementary piece 7 is any part making it possible to achieve these points of compression.
Dans le cadre de l'invention, la machine électrique 1 comporte des moyens de transfert thermique 5. Plus précisément, les moyens de transfert thermique 5 sont des moyens de dissipation thermiques radiaux.  In the context of the invention, the electric machine 1 comprises heat transfer means 5. More specifically, the heat transfer means 5 are radial heat dissipation means.
Selon un mode de réalisation de l'invention, les moyens de dissipation thermique 5 sont formés par de la résine recouvrant la surface radiale extérieure du stator 2.  According to one embodiment of the invention, the heat dissipation means 5 are formed by resin covering the outer radial surface of the stator 2.
Dans le cadre de l'invention, la surface radiale du stator est la face externe 222 du stator 2. C'est la face qui ne comporte pas de dent 22 et qui est disposée à l'extérieur du stator 2 si l'on considère que la face interne 221 du stator délimite une zone 4 du stator 2 dans laquelle est disposé le rotor 3.  In the context of the invention, the radial surface of the stator is the outer face 222 of the stator 2. This is the face which does not have a tooth 22 and which is disposed outside the stator 2 if we consider the internal face 221 of the stator delimits an area 4 of the stator 2 in which the rotor 3 is placed.
Selon un mode de réalisation de l'invention, la résine 5 comble totalement le vide entre la surface radiale du stator 2 et le corps 110 de la machine électrique 1.  According to one embodiment of the invention, the resin 5 completely bridges the gap between the radial surface of the stator 2 and the body 110 of the electric machine 1.
Selon un mode de réalisation de l'invention, la résine comble une partie du vide entre la surface radiale du stator 2 et le corps 110 de la machine électrique 1. Plus précisément, une ou plusieurs portions du vide sont comblées par la résine.  According to one embodiment of the invention, the resin fills a portion of the vacuum between the radial surface of the stator 2 and the body 110 of the electric machine 1. More specifically, one or more portions of the vacuum are filled by the resin.
Selon un mode de réalisation de l'invention, la dureté et le coefficient d'amortissement de la résine sont choisis de façon à ce qu'elle n'interfère pas avec les efforts radiaux, de façon à ne pas augmenter le bruit provoquer par la machine, mais qu'elle permette un transfert thermique suffisant. En effet, il est important que la chaleur de la machine électrique de soit pas stockée dans la machine électrique mais soit dissipée vers l'extérieur. Cela évite toute surchauffe de la machine, et notamment de son système électronique. Selon un mode de réalisation de l'invention, la résine est une résine souple. According to one embodiment of the invention, the hardness and the damping coefficient of the resin are chosen so that it does not interfere with the radial forces, so as not to increase the noise caused by the machine, but that it allows a sufficient heat transfer. Indeed, it is important that the heat of the electric machine is not stored in the electric machine but is dissipated to the outside. This prevents overheating of the machine, including its electronic system. According to one embodiment of the invention, the resin is a flexible resin.
Selon un mode de réalisation de l'invention, la résine a une dureté inférieure ou égale à 80 shore A, de préférence inférieure ou égale à 60 shore A, de manière très préférée inférieure ou égale à 40 shore A.  According to one embodiment of the invention, the resin has a hardness less than or equal to 80 shore A, preferably less than or equal to 60 shore A, very preferably less than or equal to 40 shore A.
Selon un mode de réalisation de l'invention, lorsque le stator 2 est formé de plusieurs parties, la machine électrique comporte un anneau en aluminium 120 disposé entre le stator 2 et la résine 5.  According to one embodiment of the invention, when the stator 2 is formed of several parts, the electric machine comprises an aluminum ring 120 disposed between the stator 2 and the resin 5.
Une telle machine électrique selon l'invention, permet un gain de 5 à 15 dB suivant les régimes de rotation du moteur du véhicule dans lequel la machine est utilisée. Le bruit émis par la machine électrique n'est ainsi plus considéré comme une nuisance sonore pour l'oreille humaine.  Such an electric machine according to the invention, allows a gain of 5 to 15 dB depending on the rotational speed of the engine of the vehicle in which the machine is used. The noise emitted by the electric machine is thus no longer considered a noise nuisance for the human ear.
L'invention concerne également l'utilisation d'une telle machine selon l'invention dans un compresseur 10 de suralimentation électrique pour véhicule automobile.  The invention also relates to the use of such a machine according to the invention in an electric supercharger compressor 10 for a motor vehicle.
L'invention concerne également un compresseur 10 de suralimentation électrique équipé d'une telle machine 1 selon l'invention. Plus précisément, l'invention concerne également un compresseur électrique 10 équipé d'un moteur à reluctance variable selon l'invention.  The invention also relates to an electric supercharger compressor 10 equipped with such a machine 1 according to the invention. More specifically, the invention also relates to an electric compressor 10 equipped with a variable reluctance motor according to the invention.
La portée de la présente invention ne se limite pas aux détails donnés ci-dessus et permet des modes de réalisation sous de nombreuses autres formes spécifiques sans s'éloigner du domaine d'application de l'invention. Par conséquent, les présents modes de réalisation doivent être considérés à titre d'illustration, et peuvent être modifiés sans toutefois sortir de la portée définie par les revendications.  The scope of the present invention is not limited to the details given above and allows embodiments in many other specific forms without departing from the scope of the invention. Therefore, the present embodiments should be considered by way of illustration, and may be modified without departing from the scope defined by the claims.

Claims

REVENDICATIONS
1. Machine électrique, comportant au moins un stator 2, et des moyens de réduction du bruit comprenant au moins des moyens 6 ,61"d'isolation acoustique du stator 2 par rapport au reste de la machine électrique 1. 1. Electrical machine, comprising at least one stator 2, and noise reduction means comprising at least means 6, 61 "of acoustic insulation of the stator 2 relative to the rest of the electric machine 1.
2. Machine électrique 1 selon la revendication 1, dans laquelle les moyens d'isolation acoustique sont des moyens d'isolation axiale 6 .  2. Electrical machine 1 according to claim 1, wherein the acoustic insulation means are axial insulation means 6.
3. Machine électrique 1 selon la revendication 2, dans laquelle les moyens d'isolation axiale 6 ,61"sont formés par au moins deux joints 6 ,61"disposés aux extrémités axiales 610 du stator.  3. Electric machine 1 according to claim 2, wherein the axial insulating means 6, 61 "are formed by at least two seals 6, 61" disposed at the axial ends 610 of the stator.
4. Machine électrique 1 selon la revendication 3, dans laquelle au moins une portion du joint est en compression avec la surface de l'extrémité du stator.  4. Electrical machine 1 according to claim 3, wherein at least a portion of the seal is in compression with the surface of the end of the stator.
5. Machine électrique 1 selon la revendication 4, dans laquelle le nombre de portion en compression est déterminé en fonction de la masse du stator.  5. Electrical machine 1 according to claim 4, wherein the number of portion in compression is determined according to the mass of the stator.
6. Machine électrique 1 selon la revendication 4, dans laquelle la portion de compression est réalisée par le joint lui même.  6. Electrical machine 1 according to claim 4, wherein the compression portion is formed by the joint itself.
7. Machine électrique 1 selon la revendication 4, dans laquelle la portion de compression est réalisée par une pièce complémentaire qui vient comprimer localement certaines zones du joint.  7. Electrical machine 1 according to claim 4, wherein the compression portion is formed by a complementary piece which compresses locally certain areas of the joint.
8. Machine électrique selon une des revendications 1 à 7, comportant des moyens de dissipation thermique radiaux 5 sont formés par de la résine recouvrant au moins une partie de la surface radiale extérieure 210 du stator 2.  8. Electrical machine according to one of claims 1 to 7, comprising radial heat dissipation means 5 are formed by resin covering at least a portion of the outer radial surface 210 of the stator 2.
9. Utilisation de la machine électrique 1 selon une des revendications 1 à 8 dans un compresseur de suralimentation électrique pour véhicule automobile.  9. Use of the electric machine 1 according to one of claims 1 to 8 in an electric supercharger for a motor vehicle.
10. Compresseur de suralimentation électrique équipé d'une machine électrique 1 selon une des revendications 1 à 8.  Electric supercharger equipped with an electric machine 1 according to one of claims 1 to 8.
EP15821117.7A 2014-12-11 2015-12-11 Electric machine Withdrawn EP3231065A1 (en)

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FR1462272A FR3029963B1 (en) 2014-12-11 2014-12-11 ELECTRIC MACHINE
PCT/FR2015/053445 WO2016092229A1 (en) 2014-12-11 2015-12-11 Electric machine

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US20180131249A1 (en) 2018-05-10
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CN107210631A (en) 2017-09-26

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