Classifications

• • 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
  • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
  • F02B37/04—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
• • 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
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D25/00—Pumping installations or systems
  • F04D25/02—Units comprising pumps and their driving means
  • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
  • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
  • F04D29/663—Sound attenuation
• • 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
  • H02K1/14—Stator cores with salient poles
  • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
• • 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
  • H02K1/14—Stator cores with salient poles
  • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
  • H02K1/148—Sectional cores
• • 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
  • H02K1/00—Details of the magnetic circuit
  • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
  • H02K1/246—Variable reluctance rotors
• • 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
  • H02K1/22—Rotating parts of the magnetic circuit
  • H02K1/27—Rotor cores with permanent magnets
  • H02K1/2706—Inner rotors
  • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
  • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
  • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/12—Improving ICE efficiencies

Definitions

• the present invention relates to the field of electrical machines, and relates more particularly to electrical machines having at least one stator.
• An electric machine is a machine, also called a motor, which has at least one stator.
• the stator has teeth forming the coils.
• 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 electrical systems such as supercharged electric compressors.
• these machines are used on the 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, making it possible to reduce the radial forces on the piece in contact with the stator by 10%. 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 electrical machine comprising noise reduction means configured to obtain a resonance frequency of the electrical machine located in a resonant frequency range that does not match the frequency range of the harmonics of the electric machine.
• the noise reduction means are configured to obtain a resonance frequency of the electrical machine between 1500HZ and 2500Hz.
• the machine comprises at least one stator, the noise reduction means comprising at least one recess, formed in the stator, associated with mechanical insulation means of the stator relative to the rest of the stator. the electric machine.
• the isolation means comprise axial isolation means and radial isolation means.
• the axial isolation means are formed by at least two seals arranged at the radial ends of the stator.
• the radial insulation means are formed by resin covering the outer radial surface of the stator.
• the recess extends longitudinally in the stator body parallel to a longitudinal axis of the stator and to any geometric shape to limit the mechanical stresses on the stator.
• the width of the internal recess is smaller than the width of a stator tooth and is arranged in the axis of a stator tooth.
• the internal recess is formed in the stator body at a sufficient distance from an inner face 221 of the stator body so as not to disturb the magnetic field.
• the stator comprises at least two external recesses formed on the outer face 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 sectional view of a part of the device according to the invention
• FIG. 2 is a schematic representation of a detail of a part of the device according to the invention.
• FIG. 3 is a schematic representation of a sectional view of the device according to the invention.
• FIG. 4 is a schematic representation of a detail A of the device of FIG. 3 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 2.
• 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 FIGS. 3 and 4.
• the electrical machine is a continuous or alternating current machine, synchronous or asynchronous or any type of electric machine of the same type.
• the electric motor is a variable reluctance motor (also called SRM machine for Switched Reluctance Motor according to English terminology).
• the stator comprises a body constituted by a stack of thin sheets forming a crown, also called a package of sheets, whose inner face is provided with notches open towards the inside to receive phase windings which form a winding.
• the rotor is permanent magnets.
• the stator 2 is formed of at least one body 21. 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 comprises n teeth 22, n being between 4 and 12, and very preferably equal to 6.
• Around each of the teeth 22 is disposed a coil 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 reduction of noise is achieved by defining a resonant frequency range of the machine which is not in agreement with the harmonics of the electric machine.
• the harmonics 4 and 8 are particularly audible.
• the frequency range in which the harmonics will agree with the vibration frequency of the machine and be noise source is between 2333Hz and 10000HZ.
• the range of resonance frequency in which the noise nuisance will be limited is between 1500Hz and 2500Hz, and beyond 10000Hz.
• the objective of the present invention is therefore to propose an electrical machine comprising noise reduction means configured to obtain a resonance frequency of the electrical machine located in a resonance frequency range that does not match the frequency range of the harmonics. .
• the noise reduction means are configured to obtain a resonance frequency of the electrical machine between 1500HZ and 2500Hz.
• the noise reduction means comprise at least one recess 24 formed in the stator 2 associated with mechanical acoustic insulation means 61 ', 61 ", 5 of the stator relative to the rest of the the electric machine 1. This combination gives the necessary flexibility to the system to avoid the resonance frequencies mentioned above.
• the stator 2 comprises at least one internal recess 24.
• This internal recess 24 is formed in the body 21 itself of the stator.
• the internal recess 24 is formed in the body 21 of the stator 2, and extends longitudinally, along the longitudinal axis 31 of the stator, on at least a portion of the stator, in the body 21 of the stator 2. More specifically, the internal recess extends parallel to the axis 31 of the stator.
• 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 the stator is arranged.
• the internal recess 24 extends longitudinally over the entire length of the stator 2.
• the width L ei of the internal recess 24 is greater than the width L s of a tooth 22 of the stator 2.
• the width, recess and teeth of the stator is defined by the magnitude oriented along a plane P perpendicular to a plane passing through the radius R of the stator, as opposed to the height which is defined by the magnitude passing through the radius R of the stator.
• the recess 24 internal to all possible geometric shapes. More specifically, the recess 24 internal to all geometric shapes to limit the mechanical stresses on the stator 2. Indeed, it is the mechanical stresses that contribute to noise by promoting radial forces. The reduction of the effects of the efforts thus makes it possible to limit the noise nuisances.
• the internal recess 24 is a cylinder whose generatrix to any shape to limit the mechanical stresses on the stator.
• the internal recess 24 is round.
• the internal recess 24 is oval, its width L ei being greater than its height h ei .
• the internal recess 24 is square or rectangle.
• the internal recess 24 is rectangle or square, with rounded corners.
• the recess 24 internal to an ellipse shape more precisely the internal recess 24 is an elliptical cylinder whose width is greater than the height.
• the internal recess 24 is disposed in the axis of a tooth 22 of the stator. More specifically, the internal recess 24 is disposed in the portion of the body 21 of the stator 2 extending a tooth 22 of the stator.
• the internal recess 24 is formed in the stator body at a sufficient distance from the internal face 221 of the stator body so as not to disturb the magnetic field. More specifically, the smallest distance D ei between an edge of the internal recess 24 and the internal face 221 of the stator body is greater than or equal to the width of a stator tooth divided by two (L s / 2). Such an arrangement avoids modifying the magnetic field of the electric machine.
• the internal recess 24 is disposed in the body 21 of the stator 2 and at the periphery of the body 21. That is to say, the internal recess 24 is closer to the face external 222 of the stator 2 that of the internal face 221 of the stator 2.
• the outer face 222 of the stator 2 is the one which does not have a tooth 22 and which is disposed outside the stator 2 if it is considered that the internal face 221 of the stator defines a zone 4 of the stator 2 in which the rotor 3 is arranged.
• the stator 2 comprises a number of recesses 24 identical to the number of teeth 22 of the stator.
• the stator has six internal recesses 24.
• the noise reduction means also comprise sound insulation means of the stator relative to the rest of the electrical machine.
• the acoustic insulation means comprise axial sound insulation means 6, 61 "and radial sound insulation means 5.
• the axial acoustic insulation means 61 ', 61 are formed by at least two seals 61', 61" disposed at the radial ends 610 of the stator 2.
• the radial ends 610 of the stator correspond to at the two outer surfaces of the stator 2 arranged perpendicular to the axis 31 of the stator 2.
• the seals 6, 61" are O-rings.
• the radial acoustic insulation means 5 are formed by resin covering the outer radial surface of the stator 2.
• the resin 5 completely fills the void between the radial surface of the stator 2 and the body 110 of the electric machine 1.
• 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.
• 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.
• the stator 2 also comprises at least one external recess 25 formed on the outer face of the stator, illustrated in FIG.
• This outer recess forms a groove oriented along the axis 31 of the rotor 3.
• the outer recess 25 is offset from the teeth 22 of the stator.
• the outer recess is centered between two internal recesses.
• the width of the outer recess 25 is such that it overlaps, at each of its sides, an internal recess 24.
• the machine comprises two external recesses 25, the distance D ex between two external recesses being less than the width L ei of an internal recess 24.
• the stator 2 thus comprises an alternation of internal recesses 24 and external recesses 25.
• the depth of the outer recess is between 0 and a remaining thickness of the stator body greater than or equal to the width of a stator tooth divided by two (L s / 2).
• remaining thickness means the remaining thickness between the bottom of the recess and the internal face 221 of the stator or the beginning of a tooth 22 of the stator.
• the stator 2 comprises a number of external recesses 25 identical to the number of teeth 22 of the stator.
• the stator has six external recesses.
• Such an electric machine according to the invention allows a gain of 8 to 17 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.

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

Applications Claiming Priority (2)

Publications (1)

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ID=52627296

Family Applications (1)

Country Status (6)

Families Citing this family (2)

Family Cites Families (14)

• 2014
  • 2014-10-20 FR FR1460048A patent/FR3029710B1/fr active Active
• 2015
  • 2015-10-19 US US15/519,998 patent/US10756594B2/en active Active
  • 2015-10-19 JP JP2017521236A patent/JP2017531992A/ja active Pending
  • 2015-10-19 WO PCT/FR2015/052801 patent/WO2016062955A1/fr active Application Filing
  • 2015-10-19 EP EP15791325.2A patent/EP3210280A1/de not_active Withdrawn
  • 2015-10-19 CN CN201580068360.8A patent/CN107112816A/zh active Pending

Non-Patent Citations (2)

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