EP3871320A1 - Assembly for damping acoustic energy, air flow generator for a cooling system provided with such an assembly, and associated cooling system - Google Patents

Assembly for damping acoustic energy, air flow generator for a cooling system provided with such an assembly, and associated cooling system

Info

Publication number
EP3871320A1
EP3871320A1 EP19806029.5A EP19806029A EP3871320A1 EP 3871320 A1 EP3871320 A1 EP 3871320A1 EP 19806029 A EP19806029 A EP 19806029A EP 3871320 A1 EP3871320 A1 EP 3871320A1
Authority
EP
European Patent Office
Prior art keywords
source
assembly
vibration source
radiating
heat sink
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.)
Pending
Application number
EP19806029.5A
Other languages
German (de)
French (fr)
Inventor
Thibaud MATHARAN
Olivier Cheriaux
Laurent Brosseron
Adil SBIY
Clara DEGORCE-DUMAS
Clémence KWACZEWSKI
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 Systemes Thermiques SAS
Original Assignee
Valeo Systemes Thermiques 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 Thermiques SAS filed Critical Valeo Systemes Thermiques SAS
Publication of EP3871320A1 publication Critical patent/EP3871320A1/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H02K9/227—Heat sinks
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H02K11/33—Drive circuits, e.g. power electronics
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the invention relates to an assembly dedicated to the damping of acoustic energy.
  • the invention also relates to an air flow generator equipped with such an assembly. It is more particularly intended for a cooling system for a motor vehicle.
  • the invention finds its application in particular in any device comprising a brushless electric motor.
  • the invention also finds its application, inter alia, in devices which are driven directly by the shaft of rotation of the electric motor, as well as devices which are driven by means of a gear train.
  • Electric motors conventionally include an engine block and an electronic control block dedicated to driving the engine block.
  • the engine block includes a rotor capable of rotating along an axis in order to reach a determined speed of rotation and a stator.
  • the engine block In normal operation, the engine block generates one or more vibrations or vibration frequencies to which the electronic control unit is exposed when it is mechanically linked to the engine block.
  • the invention makes it possible to overcome the aforementioned problems and to this end proposes a set comprising:
  • At least one compressible member in contact with said vibration source and said radiating source said assembly being characterized in that the compressible member is mounted compressed between said vibration source and said radiating source so as to damp said acoustic waves.
  • This provides an assembly in which the vibration source and the radiating source can be linked, in particular mechanically, while limiting the noise generated by the radiating source.
  • Acoustic emission peaks corresponding to well-defined frequencies, called pure tones, are transformed into emissions of reduced intensity over a wider frequency range. The sounds emitted are thus perceived as attenuated and are therefore less disturbing for users.
  • the compressible member, mounted between the vibration source and the radiating source in a compressed manner makes it possible to damp the vibrational energy received by the radiating source.
  • the compressible member is located at the level of damping zones
  • the vibration source is separated from the radiating source by a distance, d, less than a length, called length in the rest state, of the compressible member when said member is in a decompressed configuration;
  • the compressible member is an elastomer, preferably a thermoplastic elastomer
  • the compressible member is mounted either on the vibration source or the radiating source.
  • the assembly can be intended to equip an air flow generator for a cooling system for a motor vehicle, said assembly being characterized in that the vibration source is formed by all or part of an engine support and the radiant source is formed by all or part of a heat sink.
  • the vibrations of the heat sink, caused by the rotation of the motor, and capable of creating an audible noise, are absorbed by the compressible member.
  • the assembly includes several compressible members extending from a surface of said motor support facing the heat sink;
  • the motor support and / or the dissipator has a substantially circular shape, said compressible members being regularly distributed angularly;
  • the engine mount includes said vibration source, configured to allow attachment of the engine, and a mounting portion, configured to be attached to a mount;
  • the invention also relates to an air flow generator equipped with an assembly as described above, said air generator comprising an electric motor unit comprising the source of vibrations and a control unit electronics comprising the radiating source.
  • said engine block and said electronic control block are located in the extension of one another along a longitudinal axis of the engine block.
  • the invention further relates to a cooling system for a motor vehicle comprising an air flow generator as mentioned above.
  • FIG. 1 a schematically illustrates, in sectional view, an assembly according to the prior art
  • FIG. 2 is an exploded view of an air flow generator according to the prior art
  • FIG. 3 illustrates, in perspective, a motor support of the air flow generator according to the invention
  • FIG. 4 illustrates, in perspective, in an alternative embodiment, a heat sink of an air flow generator according to the invention
  • FIG. 5a presents a comparison of two acoustic spectra centered around the frequency 4 kHz: the dark gray spectrum is associated with the acoustic waves generated without the invention and, the light gray spectrum is associated with the acoustic waves generated by a set according to the invention;
  • FIG. 5b presents a comparison of five acoustic spectra illustrating an emission peak associated with the eighth harmonic of the acoustic spectrum associated with an air flow generator comprising a rotary vibration source rotating at a speed of 2300 RPM (rotation per minute ), the spectrum in the thickest line is associated with the air flow generator equipped with the assembly according to the invention.
  • FIG. 1 a schematically illustrates in a simplified manner an assembly 100 according to the prior art comprising a vibration source 200 capable of dissipating a vibrational energy e v and a radiating source 300 capable of generating acoustic waves from said vibratory energy e v .
  • the vibration source 200 and the radiating source 300 are mechanically linked by means of fixing means 120.
  • the invention relates to an assembly 10 comprising a vibration source 20 capable of dissipating a vibrational energy e v and a radiating source 30 capable of generating acoustic waves from said vibratory energy e v .
  • the vibration source 20 can be any part of any device capable of undergoing instantaneous deformations, that is to say capable of vibrating and dissipating vibrational energy e v , for example under the effect of rotational movements, shocks produced by objects or other parts, displacements, etc.
  • This type of vibration source is found in particular in mechanical systems comprising rotary mechanisms such as motors, reactors, pumps, turbomachines, etc.
  • the vibration source 20 according to the invention is in particular rotary.
  • the vibrational energy e v emitted by such a source is capable of propagating, step by step, through the elements of the surrounding medium in the form of a wave so that a “vibratory bridge” or even “vibratory path” is created between the source of the vibration and the elements of the medium through which said wave passes.
  • the vibrational energy e v dissipated by the vibration source 20 is thus able to propagate from the vibration source 20 towards the radiating source 30, that is to say transferred to said radiating source 30.
  • the radiating source 30 for its part, is any element of the medium capable of generating acoustic waves from the vibrational energy e v of the vibration source.
  • the capacity of the radiating source 30 to generate acoustic waves from the vibrational energy e v depends on its sensitivity to the frequency (s) of the wave (s) produced from the vibrations.
  • the intensity with which these acoustic waves are perceived depends on the structure as well as on the nature of the material from which the radiating source is made 30.
  • the sound emitted by a metal plate, for example aluminum, subjected to a vibration will be perceived more clearly than the sound emitted by a plate made of plastic.
  • the vibrational energy e v is transformed into resonance peaks linked to vibration modes in aluminum, while in the other case said energy e v will be more easily absorbed in plastic, that -this being able to attenuate the vibrations.
  • the intensity with which the acoustic waves are perceived also depends on the shape of the radiating source, the presence or absence of openings at its ends, its dimensions, etc.
  • the assembly according to the invention also comprises at least one compressible member 40 in contact with said source of vibrations 20 and said radiating source 30.
  • the compressible member 40 is linked in a vibratory manner both at the source of vibrations 20 and at the radiating source 30.
  • the compressible member 40 is mounted compressed between said vibration source 20 and said radiating source 30 so as to dampen the acoustic waves.
  • the vibrational energy e v provided by the vibration source 20 allows the compressible member 40 to deform by compression / decompression.
  • the vibrational energy e v is stored, that is to say absorbed, by the compressible member 40 then transformed, at least in part, into potential energy of deformation e P d which results in the deformation of the compressible member 40.
  • the vibrational energy e v is distributed at the output between one (s) main vibrational frequency (s) f a, P and secondary vibrational frequencies fa, s so that it is not only attenuated but also spread over a wider frequency range.
  • the compressible member 40 can advantageously be made of an elastomer, preferably of the thermoplastic type, the latter being elastic and having a low cost.
  • the vibration source 20 and the radiating source 30 can be linked mechanically, even rigidly, without this affecting the proper functioning of the assembly 10 according to the invention.
  • the attenuation of the vibratory energy e v is made possible by the intermediary of the compressible member 40 so that in the presence of said compressible member 40, it is not compulsory to mechanically decouple the source of vibrations 20 and the radiating source 30.
  • the assembly 10 can thus comprise a source of vibrations 20 and a radiating source 30 mechanically linked.
  • the compressible member 40 can be mounted either on the vibration source 20 or on the radiating source 30. Indeed, it is not so much the surface from which the compressible member 40 extends that matters in the context of the invention, but the fact that said compressible member 40 is in contact with the vibration source 20 and the radiating source 30 and mounted compressed between said sources 20, 30.
  • the compressible member 40 can be mounted on a support portion 42, either from the vibration source 20 and extending towards the radiating source 30 or, from the radiating source 30 and extending towards the vibration source 20
  • This support portion 42 makes it possible to locally reduce the difference between said sources 20 and 30 depending on the distance separating the vibration source 20 and the radiating source 30.
  • the support portion 42 has a cylindrical shape, which is better suited to the propagation of acoustic waves. It is not mandatory that the support portion 42 be made of the same material as the source from which it originates.
  • the compressible member 40 is located in one or different discrete zones, called damping zones, and, at the level of said damping zone or zones, the vibration source 20 is separated from the radiating source 30 by a distance , d, less than a length, called length in the rest state, of the compressible member 40 when said member is in a decompressed configuration, before mounting.
  • said depreciation areas can be distributed in any way. That said, their spatial distribution can be determined based on the position of nodes / nodal lines and / or bellies / ventral lines of the vibrations that exist in the room when the damping zones are not implemented.
  • the nodes / nodal lines are formed at defined and fixed locations where the vibrations of the same frequency and the same intensity produced by the vibration source 20 cancel each other out perfectly so that the vibrations disappear.
  • Bellies / belly lines form at locations, also defined and fixed, where vibrations of the same frequency and the same intensity produced by the vibration source 20 add up so that the vibrations are amplified.
  • the position of the ventral lines depends on that of the nodal lines.
  • the damping zones can therefore be located at the level of the bellies / ventral lines.
  • the cushioning zones can be positioned in two configurations. In a first configuration, the damping zones can be positioned at the level of a belly / ventral line associated with a given frequency. In this case, the acoustic waves generated by the radiating source 30 from the vibrations produced at this frequency will be significantly damped. In a second configuration, the damping zones can be positioned at the level of several bellies / ventral lines so as to target several given frequencies, or even a range of frequencies. In such a case, all the acoustic waves generated by the radiating source 30 from the vibrations produced at these frequencies will be damped.
  • the assembly 10 comprises a number of damping zones adapted to the intensity of the vibrations.
  • the vibrational energy e v which can be attenuated, and therefore the vibrational amplitude transferred to the radiating source 30.
  • the number of damping zones makes it possible to control the damping of the acoustic waves.
  • the intensity of the vibrations varies as a function of the speed of rotation.
  • the number of damping zones can be adjusted according to the speed of rotation so that the damping is adapted to the intensity of the vibrations.
  • the compressible member 40 may advantageously be in the form of a cross.
  • the support portion 42 may also have the shape of a cross.
  • the cross shape of the compressible member 40, and optionally of the support portion 42 has an immediate influence on the shape and location of the ventral and nodal lines. Let's go back to the example of the whole
  • the cross comprises a first branch oriented towards the axis of rotation of the vibration source 20 and a second branch perpendicular to said first branch
  • FIG. 2 illustrates an air flow generator 1 for sucking and blowing air.
  • the air flow generator 1 comprises a motor unit 2 and an electronic control unit 3 located in the extension of one another along a main longitudinal axis X (illustrated by a dotted line).
  • the electronic control unit 3 is thus positioned to power the engine unit 2 while limiting the magnetic nuisance generated by its own internal elements which will be described later.
  • the motor unit 2 consists of a brushless electric motor, also called an electric motor with electronic commutation. It is able to rotate a ventilation wheel 28 via an output shaft 260 of said engine block 2, extending along said longitudinal axis X.
  • the engine block 2 mainly comprises a stator 24 provided with an excitation winding and a rotor 26, carrying the output shaft 260 capable of driving the ventilation wheel 28.
  • the stator 24 is made integral with a heat sink heat 32 of the electronic control unit 3, and the rotor 26 is arranged around the stator 24 to be driven in rotation under the effect of magnetic fields generated by the winding and magnets associated with the rotor.
  • the stator 24 has a shape of revolution around the main longitudinal axis X.
  • the stator 24 comprises a casing having an annular central wall 240 which delimits the contour of an internal bore 242, and the external face of which is extended by a plurality of teeth 244 arranged radially in a star.
  • the excitation winding is composed of several phases, each comprising at least one wire winding 246, the outputs of which are electrically connected to supply means here not shown (only the connection means 248 are visible).
  • the stator 24 here has twelve teeth wound in three phase.
  • the wire winding is carried out around the teeth 244, each tooth carrying a winding element.
  • the rotor 26 has a bell shape, with an annular crown 264 and a perforated closure wall 262, disposed at one end of said crown.
  • the closure wall can take a planar shape substantially perpendicular to the axis of the crown or else a curved shape in disengagement from the crown, and it carries in its center the motor output shaft 260.
  • the crown 264 has a diameter greater than the outside diameter of the stator 24, so that the rotor 26 can come to cover the stator.
  • the crown has an internal face which faces the stator in this covering position, and a plurality of permanent magnets 266 is arranged on this internal face of the rotor crown.
  • the stator 24 When the engine block 2 is assembled, the stator 24 is disposed in the body of the rotor delimited by the crown 264.
  • the rotor and the stator are thus arranged so that the permanent magnets 266, carried by the rotor 26, are constantly arranged in the magnetic field generated by the stator 24 coils when these are supplied with current, so as to generate a rotational movement of the rotor around the stator.
  • the stator 24 and the rotor 26 are arranged so that the closing wall 262 of the rotor faces the ventilation wheel 28 and that the stator is arranged, opposite, opposite the heat sink 32.
  • the heat sink 32 performs the function of articulation of the motor shaft 260. It also fulfills here the functions of grounding and improvement of the EMC.
  • the heat sink 32 comprises a plate 320, of substantially circular shape, and a barrel 322 projecting from the plate and having an internal channel 324 opening out substantially at the center of the plate.
  • the plate 320 extends in a plane substantially perpendicular to the axis of revolution of the internal channel of the barrel.
  • the barrel 322, which is substantially cylindrical, is capable of being housed in the internal bore 242 of the stator 24 and of receiving the motor output shaft 260 integral with the rotor 26.
  • the plate 320 has a discoidal shape, but this- this can take other forms, for example rectangular, square, elliptical, etc.
  • the heat sink 32 ensures the correct positioning of the rotor 26 relative to the stator 24.
  • the stator 24 and the heat sink 32 are fixed to each other.
  • the stator is arranged around the barrel 322, being in contact with the external face of said barrel, while the rotor 26 is received, by means of the output shaft 260 of which it is integral, in the internal channel 324 of the was.
  • One or more bearings 80, 82 can be inserted in the heat sink 32 in particular in the barrel 322 to serve as a rotation guide for the output shaft 260 also driven in rotation by the rotor 26.
  • This (s) bearing (s) can (wind) be a ball bearing (s), but it (s) can (wind) take the form of a roller, needle, or other bearing (s).
  • the output shaft 260 carried by the rotor 26, is mounted for rotation inside the barrel 322 of the motor support by means of the bearing or bearings 80, 82.
  • the plate 320 and the barrel 322 form a single piece which contributes to good EMC.
  • the heat sink 32 is made of aluminum, so that light weight and good characteristics are combined for this part. thermal conduction.
  • the heat sink 32 can be connected to the electrical ground.
  • the ventilation wheel 28 of the air flow generator 1 is made integral with the free end of the output shaft 260 of the engine. It comprises, arranged at its periphery, a plurality of fins 280 and a cover 282. The rotation of the rotor 26 rotates the ventilation wheel 28 which contributes to producing pulsed air by means of the fins.
  • the engine block 2 is supported by means of an engine support 22 having here and without limitation a substantially circular shape.
  • the engine mount 22 includes a mounting portion 222 configured to be attached to an HVAC package.
  • the mounting part 222 includes numerous fixing zones.
  • the mounting part 222 comprises two portions, a central portion 222a and a peripheral portion 222b, both arranged coaxially with a central orifice 224.
  • the peripheral portion 222b is intended to be fixed to an HVAC box.
  • the engine support 22 is mechanically linked to the heat sink 32 rigidly, in particular at the level of the central portion 222a. More specifically, the engine support 22 and the heat sink 32 are screwed to each other so that the heat sink 32 is in contact with the engine support 22 in particular at the level of the screwing well 228. It is in particular plated, at least in part, on the motor support 22. Plating is facilitated by means of positioning pads 230 distributed angularly and / or concentrically at the edge of the central portion 222a. Thus, when the rotor 26 rotates, the attachment zones located at the level of the motor support 22 are all sources of vibration for the heat sink 32. Vibratory decoupling is therefore necessary.
  • the engine support 22 comprises first, second and third acoustic decoupling means 226a, 226b and 226c.
  • the acoustic decoupling means 226a, 226b and 226c are arranged concentrically and / or radially around the central orifice 224 which makes it possible to reduce the vibrations induced by the engine block 2 at the fixing zones of the mounting part 222.
  • they are preferably made of plastic, and very preferably made of elastomer, for example silicone.
  • the first acoustic decoupling means 226a comprises elements of generally elliptical shape distributed angularly around the periphery of the central orifice 224 and in contact with the barrel 322.
  • the second acoustic decoupling means 226b is located at the level of grooves formed inside the central portion 222a and forms a decoupling path from the first acoustic decoupling means 226a to the third acoustic decoupling means 226c .
  • the third acoustic decoupling means 226c is annular and arranged coaxially between the central portion 222a and the peripheral portion 222b. It further reduces the vibrations induced by the engine block 2 at the barrel 322.
  • the acoustic decoupling means 226a, 226b and 226c do not allow the vibrations induced by the motor to be damped on the heat sink 32, all the more so since the heat sink 32 is metallic. Other means of depreciation are required. These means are described below.
  • the electronic control unit 3 it comprises, in addition to the plate 320 and the barrel 322, an electronic control card 34 and a cover 36.
  • the electronic card 34, the heat sink 32 and the cover 36 are held integral by means of fixing means passing through (not shown), for example, screws.
  • fixing means passing through (not shown), for example, screws.
  • the cover 36 is hollow and represents the external envelope of the electronic control unit 3. It participates in the heat dissipation.
  • the cover 36 includes an appropriate interior volume allowing it to accommodate the electronic control card 34 by matching the contours of said electronic card 34.
  • the cover 36 is the part most likely to generate acoustic waves.
  • the electronic control card 34 comprises one or more control elements and / or connectors to external circuits. It is intended for food from the engine block 2.
  • the control elements give off heat which must be dissipated at the risk of causing damage to the electronic control card 34.
  • the electronic card requires limited operating temperatures, for example 120 or 150 ° vs.
  • the electronic card 34 can be thermally coupled to the heat sink 32, here metallic, by means of a thermal paste making it possible to effectively cool said electronic card 34 by thermal conduction.
  • the heat sink 32 integrates several functions including the cooling of the components of said electronic card 34 and the support of the electronic control unit 3.
  • the plate 320 of the heat sink 32 forms a housing intended to accommodate the electronic control card 34.
  • the housing has a shape, in this case rectangular, matching the contours of the electronic card 34.
  • the interior surface of the housing 320 is generally planar. It nevertheless has some excavations adapted to the elements passing through said electronic card 34 and allowing close contact between the electronic card 34 and said housing 320.
  • the heat sink 32 can be directly connected to the ground of the electronic card 34, which, combined with the fact that it is made of metal, makes it possible to block electromagnetic radiation emitted by the electronic card, this radiation being able to disturb the operation of the engine block 2.
  • the engine support 22 When the air flow generator 1 is in operation, the engine support 22 generates vibrations induced by the rotation of the rotor 26 at its central orifice 224 which receives the barrel 322, itself linked to the rotor by the (s ) bearing (s) 80, 82.
  • the heat sink 32 and the engine support 22 being in contact, the electronic control unit 3 is exposed to the vibrations induced by the engine unit 2.
  • the motor support 22 forms a source of vibrations 20 in particular capable of dissipating vibrational energy e v
  • the heat sink 32 being metallic, consists of a radiating source 30 capable of generating acoustic waves from of said vibrational energy e v .
  • the compressible members 40 in the form of pellets, are linked to the motor support 22. Once the air flow generator 1 has been assembled, these members compressible 40 are further in contact with the heat sink 32.
  • the compressible members 40 are arranged on cylindrical portions 220, called “studs”, coming from the motor support 22.
  • these studs 220 extend axially from the central portion 222a in parallel with the main longitudinal axis X. In addition, they rise enough to locally reduce the distance between the motor support 22 and the heat sink 32. Their length may even be greater than the distance between the motor support 22 and the heat sink 32.
  • the central portion 222a has cavities which locally create gaps between the motor support 22 and the heat sink 32, in particular the plate 320.
  • the compressible members 40 are distributed angularly and regularly from the central portion 222a (which, as a reminder, is located opposite the heat sink 32) and form damping zones. This configuration is particularly suitable for the concentric propagation of the vibratory waves created by the engine block 2 from the central orifice 224 of the engine support. In addition, the ventral / nodal lines associated with these vibrations also propagate concentrically so that the angular distribution of said compressible members 40 makes it possible to target them one by one.
  • the compressible members 40 and the pads 220 are located at the same distance from the main longitudinal axis X, and therefore the axis of the heat sink 32.
  • the compressible members 40 and the studs 220 can be located at different distances from the main longitudinal axis X. In this case, several vibration frequencies are targeted, all of the Acoustic waves generated by the heat sink 32 from the vibrations produced at these frequencies will be damped.
  • the compressible members 40 are three in number, which allows appropriate damping of the acoustic waves taking into account the fact that the heat sink 32 is metallic and the intensity of the vibrations generated by the engine block 2, knowing that the latter performs approximately 2300 rpm on average in normal operation.
  • This number of compressible members 40 is not limiting and must be adapted according to the characteristics of the engine block 2.
  • the compressible members 40 are mounted compressed between said motor support 22 and said heat sink 32 so as to dampen said acoustic waves capable of being generated by the heat sink 32.
  • they are preferably made of thermoplastic elastomer.
  • the compressible members 40 are thus vibratively linked both to the motor support 22 and to the heat sink 22.
  • the compressible members 40 being in contact with the heat sink 32, the vibrational energy e v dissipated by the motor support 22 is attenuated and spread out then transferred to the heat sink 32 so that the acoustic waves capable of being generated by said dissipator 32 are damped.
  • the compressible members 40 are in the form of a cross.
  • the same is true for the studs 220.
  • the cross shape of the compressible members 40 and of the support portion 42 makes it possible to target both the radial ventral lines and the angular ventral lines. Therefore, this allows access to a higher number of vibration frequencies.
  • the compressible members 40 extend from the heat sink 32.
  • the compressible members 40 extend parallel to the main longitudinal axis X from cavities present on one face of the heat sink oriented opposite the motor support 22. They extend more precisely from excavations (adapted to the traversing elements of said electronic card 34) formed in the heat sink 32. In addition, they rise enough so that once the air flow generator 1 assembled, they are in contact with the motor support 22, without any additional means (in particular without plot).
  • the compressible members 40 are distributed angularly and regularly from the heat sink 32 and form damping zones.
  • the compressible members are each in the form of two angular cylinder sectors which follow the periphery of the excavations made in the heat sink 32 and which are connected by a portion of fine material extending substantially at the level of a median zone of said sectors.
  • the compressible members 40 are located at the same distance from the main longitudinal axis X, the two sectors being located at different radial positions, it is at least two different vibration frequencies that can be targeted. Thus, it is well understood that even in their form, the compressible members 40 can influence the number of frequencies at which the acoustic waves can be damped.
  • the compressible members 40 are mounted compressed between said motor support 22 and said heat sink 32 so as to damp said acoustic waves likely to be generated by the heat sink 32.
  • the compressible members 40 are three in number, which allows appropriate damping of the acoustic waves of the engine block 2. They are preferably made of the same material as the decoupling means, in particular an elastomer, by example of silicone.
  • the dark gray spectrum is associated with the acoustic waves generated by a motor support 22 and a heat sink 32 of an air flow generator without the invention and, the light gray spectrum is associated with the acoustic waves generated by a assembly 1 according to the example illustrated in FIG. 3 of the invention.
  • the aluminum heat sink 32 emits acoustic waves according to an acoustic spectrum Sa for which the main emission peak is located at a main frequency f a, P substantially centered at 4 kHz.
  • the acoustic waves generated by the assembly 1 according to the invention are damped, since at this frequency the emission peak is itself damped, i.e. attenuated and spread over a greater frequency range.
  • an air flow generator 1 equipped with such an assembly induces much less noise than those which would be caused by the pure sounds emitted in the absence of said assembly.
  • FIG. 5b is illustrated a comparison of five acoustic spectra having an emission peak associated with the eighth harmonic of the acoustic spectrum of FIG. 5a.
  • the radiating source 30 is capable of vibrating by being connected to a source of vibrations other than the source of vibrations 20 carrying / in contact with the compressible member.
  • the vibration source 20 can itself be subjected to vibrations generated by the radiating source 30.
  • the insertion is based on the use a vibrating element, at the vibration source 20, to dampen the vibrations of a noise source, namely the radiating source 30, by interposing a compressible member between the two.

Abstract

The invention relates to an assembly (10) comprising a vibrating source (20) capable of dissipating vibrational energy (ev); a radiating source (30) capable of generating acoustic waves from the vibrational energy (ev); at least one compressible member (40) which is in contact with the vibrating source (20) and the radiating source (30); the assembly (10) being characterised in that the compressible member (40) is mounted so as to be compressed between the vibrating source (20) and the radiating source (30) in such a way as to dampen the acoustic waves.

Description

ENSEMBLE DEDIE A L’AMORTISSEMENT D’UNE ENERGIE ACOUSTIQUE, GENERATEUR DE FLUX D’AIR POUR UN SYSTEME DE REFROIDISSEMENT EQUIPE D’UN TEL ENSEMBLE ET SYSTEME DE REFROIDISSEMENT ASSOCIE  ASSEMBLY DEDICATED TO ACOUSTIC ENERGY DAMPING, AIRFLOW GENERATOR FOR A COOLING SYSTEM EQUIPPED WITH SUCH AN ASSEMBLY AND ASSOCIATED COOLING SYSTEM
Domaine de l’invention Field of the invention
L’invention concerne un ensemble dédié à l’amortissement d’une énergie acoustique. L’invention concerne également un générateur de flux d’air équipé d’un tel ensemble. Elle est plus particulièrement destinée à un système de refroidissement pour véhicule automobile. The invention relates to an assembly dedicated to the damping of acoustic energy. The invention also relates to an air flow generator equipped with such an assembly. It is more particularly intended for a cooling system for a motor vehicle.
L’invention trouve en particulier son application dans tout dispositif comprenant un moteur électrique sans balais. L’invention trouve également son application entre autres dans les dispositifs à entrainement direct par l’arbre de rotation du moteur électrique, ainsi que les dispositifs à entrainement par l’intermédiaire d’un train d’engrenages. The invention finds its application in particular in any device comprising a brushless electric motor. The invention also finds its application, inter alia, in devices which are driven directly by the shaft of rotation of the electric motor, as well as devices which are driven by means of a gear train.
Etat de la technique State of the art
Les moteurs électriques comprennent classiquement un bloc moteur et un bloc de commande électronique dédié au pilotage du bloc moteur. Le bloc moteur comprend un rotor apte à tourner selon un axe en vue d’atteindre une vitesse de rotation déterminée et un stator. En fonctionnement normal, le bloc moteur génère une ou plusieurs vibrations ou fréquences vibratoires auxquelles le bloc de commande électronique est exposé quand il est lié mécaniquement au bloc moteur. Electric motors conventionally include an engine block and an electronic control block dedicated to driving the engine block. The engine block includes a rotor capable of rotating along an axis in order to reach a determined speed of rotation and a stator. In normal operation, the engine block generates one or more vibrations or vibration frequencies to which the electronic control unit is exposed when it is mechanically linked to the engine block.
Un problème survient lorsque le bloc de commande électronique comprend des pièces dont la fréquence de vibration se situe dans le domaine audible, ce qui est notamment le cas d’éléments métalliques. En effet, en réponse à la (aux) vibration(s) générée(s) par le bloc moteur, les éléments métalliques émettent un(des) son(s) pur(s) désagréable(s) à l’ouïe humaine. Il a donc été proposé de découpler de façon acoustique le bloc moteur et le bloc de commande électronique, permettant ainsi de supprimer ces sons purs. A problem arises when the electronic control unit includes parts whose vibration frequency is in the audible range, which is particularly the case with metallic elements. Indeed, in response to the vibration (s) generated by the engine block, the metal elements emit a pure sound (s) unpleasant (s) to human hearing. It has therefore been proposed to acoustically decouple the engine block and the electronic control block, thus making it possible to eliminate these pure sounds.
Cette solution est certes efficace mais ne convient pas à toutes les situations. Par exemple, avec des moteurs électriques, il n’est pas souhaitable de découpler le bloc moteur et le bloc de commande car cela crée des discontinuités de matière limitant les performances en terme de compatibilité électromagnétique (CEM) du dispositif. Dans d’autre cas de figures, le découplage ne peut s’effectuer au niveau de la zone où est(sont) émis le(s) son(s) pur(s). En effet, certains moteurs nécessitent que le découplage acoustique soit effectué en aval de cette zone. This solution is certainly effective but is not suitable for all situations. For example, with electric motors, it is not desirable to decouple the motor unit and the control unit because this creates discontinuities of material limiting the performances in terms of electromagnetic compatibility (EMC) of the device. In other cases, decoupling cannot be carried out in the area where the pure sound (s) is (are) emitted. Indeed, some engines require that acoustic decoupling be performed downstream of this zone.
L’invention permet de surmonter les problèmes précités et propose à cet effet un ensemble comprenant : The invention makes it possible to overcome the aforementioned problems and to this end proposes a set comprising:
- une source de vibrations apte à dissiper une énergie vibratoire, - a source of vibrations capable of dissipating vibrational energy,
- une source rayonnante susceptible de générer des ondes acoustiques à partir de ladite énergie vibratoire, - a radiating source capable of generating acoustic waves from said vibrational energy,
- au moins un organe compressible en contact avec ladite source de vibrations et ladite source rayonnante, ledit ensemble étant caractérisé en ce que l’organe compressible est monté compressé entre ladite source de vibrations et ladite source rayonnante de sorte à amortir lesdites ondes acoustiques. - At least one compressible member in contact with said vibration source and said radiating source, said assembly being characterized in that the compressible member is mounted compressed between said vibration source and said radiating source so as to damp said acoustic waves.
On dispose de cette manière d’un ensemble dans lequel la source de vibrations et la source rayonnante peuvent être liées, en particulier mécaniquement, tout en limitant le bruit généré par la source rayonnante. Les pics d’émissions acoustiques correspondant à des fréquences bien déterminées, appelés sons purs, sont transformés en des émissions d’intensité réduite sur une plage de fréquence élargie. Les sons émis sont ainsi perçus comme atténués et sont donc moins dérangeant pour les utilisateurs. En effet, l’organe compressible, monté entre la source de vibrations et la source rayonnante de façon compressée permet d’amortir l’énergie vibratoire reçue par la source rayonnante. This provides an assembly in which the vibration source and the radiating source can be linked, in particular mechanically, while limiting the noise generated by the radiating source. Acoustic emission peaks corresponding to well-defined frequencies, called pure tones, are transformed into emissions of reduced intensity over a wider frequency range. The sounds emitted are thus perceived as attenuated and are therefore less disturbing for users. Indeed, the compressible member, mounted between the vibration source and the radiating source in a compressed manner makes it possible to damp the vibrational energy received by the radiating source.
Selon différentes caractéristiques de l’invention qui pourront être prises ensemble ou séparément : According to different characteristics of the invention which can be taken together or separately:
- la source de vibration est rotative ; - the vibration source is rotary;
- la source de vibrations et la source rayonnante sont liées mécaniquement ; - the vibration source and the radiating source are mechanically linked;
- la source de vibration et la source rayonnante sont liées de façon rigide ; - the vibration source and the radiating source are rigidly linked;
- l’organe compressible est localisé au niveau de zones d’amortissement ; - the compressible member is located at the level of damping zones;
- au niveau de la ou desdites zones d’amortissement, la source de vibration est séparée de la source rayonnante par une distance, d, inférieure à une longueur, dite longueur à l’état de repos, de l’organe compressible lorsque ledit organe est dans une configuration décompressée ; - At the level of said damping zone (s), the vibration source is separated from the radiating source by a distance, d, less than a length, called length in the rest state, of the compressible member when said member is in a decompressed configuration;
- la ou les zones d’amortissement sont réparties de manière discrète ; - the depreciation area (s) are discreetly distributed;
- l’organe compressible est un élastomère, de préférence un élastomère thermoplastique ; - The compressible member is an elastomer, preferably a thermoplastic elastomer;
- l’organe compressible est monté indifféremment sur la source de vibrations ou la source rayonnante. - the compressible member is mounted either on the vibration source or the radiating source.
Avantageusement, l’ensemble peut être destiné à équiper un générateur de flux d’air pour un système de refroidissement pour véhicule automobile, ledit ensemble étant caractérisé en ce que la source de vibrations est formée par tout ou partie d’un support moteur et la source rayonnante est formée par tout ou partie d’un dissipateur de chaleur. Les vibrations du dissipateur de chaleur, engendrées par la rotation du moteur, et susceptibles de créer un bruit audible, sont amorties par l’organe compressible. Advantageously, the assembly can be intended to equip an air flow generator for a cooling system for a motor vehicle, said assembly being characterized in that the vibration source is formed by all or part of an engine support and the radiant source is formed by all or part of a heat sink. The vibrations of the heat sink, caused by the rotation of the motor, and capable of creating an audible noise, are absorbed by the compressible member.
Selon d’autres caractéristiques qui pourront être prises ensemble ou séparément : According to other characteristics which can be taken together or separately:
- l’ensemble comprend plusieurs organes compressibles s’étendant depuis une surface dudit support moteur en vis-à-vis du dissipateur de chaleur ; - the assembly includes several compressible members extending from a surface of said motor support facing the heat sink;
- le support moteur et/ou le dissipateur présente une forme sensiblement circulaire, lesdits organes compressibles étant répartis régulièrement angulairement ; - The motor support and / or the dissipator has a substantially circular shape, said compressible members being regularly distributed angularly;
- le support moteur comprend ladite source de vibrations, configurée pour permettre une fixation du moteur, et une partie de montage, configurée pour être fixée à un support ; - The engine mount includes said vibration source, configured to allow attachment of the engine, and a mounting portion, configured to be attached to a mount;
- ladite source de vibration et la partie de montage sont reliées par des moyens de découplage acoustique ; - Said vibration source and the mounting part are connected by means of acoustic decoupling;
- lesdits moyens de découplage acoustique et les organes compressibles sont réalisés dans le même matériau. - Said acoustic decoupling means and the compressible members are made of the same material.
L’invention concerne également un générateur de flux d’air équipé d’un ensemble tel que décrit précédemment, ledit générateur d’air comprenant un bloc moteur électrique comportant la source de vibrations et un bloc de commande électronique comportant la source rayonnante. Avantageusement, ledit bloc moteur et ledit bloc de commande électronique sont situés dans le prolongement l’un de l’autre le long d’un axe longitudinal du bloc moteur. The invention also relates to an air flow generator equipped with an assembly as described above, said air generator comprising an electric motor unit comprising the source of vibrations and a control unit electronics comprising the radiating source. Advantageously, said engine block and said electronic control block are located in the extension of one another along a longitudinal axis of the engine block.
L’invention concerne en outre un système de refroidissement pour véhicule automobile comprenant un générateur de flux d’air tel que précité. The invention further relates to a cooling system for a motor vehicle comprising an air flow generator as mentioned above.
Présentation des figures Presentation of the figures
D’autres objets, caractéristiques et avantages de l’invention apparaîtront plus clairement dans la description qui suit, faite en référence aux figures annexées, dans lesquelles : Other objects, characteristics and advantages of the invention will appear more clearly in the description which follows, given with reference to the appended figures, in which:
- la figure 1 a illustre de manière schématique, en vue de coupe, un ensemble selon l’art antérieur ; - Figure 1 a schematically illustrates, in sectional view, an assembly according to the prior art;
- la figure 1 b illustre de manière schématique, en vue de coupe, un ensemble selon l’invention ; - Figure 1b schematically illustrates, in sectional view, an assembly according to the invention;
- la figure 2 est une vue éclatée d’un générateur de flux d’air selon l’art antérieur; - Figure 2 is an exploded view of an air flow generator according to the prior art;
- la figure 3 illustre, en perspective, un support moteur du générateur de flux d’air selon l’invention; - Figure 3 illustrates, in perspective, a motor support of the air flow generator according to the invention;
- la figure 4 illustre, en perspective, dans une variante de réalisation, un dissipateur de chaleur d’un générateur de flux d’air conforme à l’invention ; - Figure 4 illustrates, in perspective, in an alternative embodiment, a heat sink of an air flow generator according to the invention;
- la figure 5a présente une comparaison de deux spectres acoustiques centrés autour de la fréquence 4 kHz : le spectre en gris foncé est associé aux ondes acoustiques générées sans l’invention et, le spectre en gris clair est associé aux ondes acoustiques générées par un ensemble selon l’invention ; - Figure 5a presents a comparison of two acoustic spectra centered around the frequency 4 kHz: the dark gray spectrum is associated with the acoustic waves generated without the invention and, the light gray spectrum is associated with the acoustic waves generated by a set according to the invention;
- la figure 5b présente une comparaison de cinq spectres acoustiques illustrant un pic d’émission associé à la huitième harmonique du spectre acoustique associé à un générateur de flux d’air comprenant une source vibratoire rotative tournant à une vitesse de 2300 RPM ( rotation par minute), le spectre dans le trait le plus épais est associé au générateur de flux d’air équipé de l’ensemble selon l’invention. - Figure 5b presents a comparison of five acoustic spectra illustrating an emission peak associated with the eighth harmonic of the acoustic spectrum associated with an air flow generator comprising a rotary vibration source rotating at a speed of 2300 RPM (rotation per minute ), the spectrum in the thickest line is associated with the air flow generator equipped with the assembly according to the invention.
Description détaillée La figure 1 a illustre schématiquement et de manière simplifié un ensemble 100 selon l’art antérieur comprenant une source de vibrations 200 apte à dissiper une énergie vibratoire ev et une source rayonnante 300 susceptible de générer des ondes acoustiques à partir de ladite énergie vibratoire ev. La source de vibrations 200 et la source rayonnante 300 sont liées mécaniquement par l’intermédiaire de moyens de fixation 120. Afin de découpler de manière vibratoire la source de vibrations 200 et la source rayonnante 300, il est classiquement proposé de placer un isolant acoustique entre les deux sources, de sorte qu’il n’est plus possible d’assurer une liaison mécanique rigide entre lesdites sources. Dans certains dispositifs cette contrainte doit pourtant être respectée. detailed description Figure 1 a schematically illustrates in a simplified manner an assembly 100 according to the prior art comprising a vibration source 200 capable of dissipating a vibrational energy e v and a radiating source 300 capable of generating acoustic waves from said vibratory energy e v . The vibration source 200 and the radiating source 300 are mechanically linked by means of fixing means 120. In order to decouple the vibration source 200 and the radiating source 300 in a vibratory manner, it is conventionally proposed to place an acoustic insulator between the two sources, so that it is no longer possible to provide a rigid mechanical connection between said sources. In some systems, this constraint must however be respected.
En référence à la figure 1 b, l’invention concerne un ensemble 10 comprenant une source de vibrations 20 apte à dissiper une énergie vibratoire ev et une source rayonnante 30 susceptible de générer des ondes acoustiques à partir de ladite énergie vibratoire ev. Referring to Figure 1b, the invention relates to an assembly 10 comprising a vibration source 20 capable of dissipating a vibrational energy e v and a radiating source 30 capable of generating acoustic waves from said vibratory energy e v .
La source de vibrations 20 peut être n’importe quelle pièce d’un dispositif quelconque apte à subir des déformations instantanées, c’est-à-dire apte à vibrer et à dissiper une énergie vibratoire ev, par exemple sous l’effet de mouvements de rotation, de chocs produits par des objets ou d’autres pièces, des déplacements, etc. On trouve notamment ce type de sources de vibrations dans les systèmes mécaniques comprenant des mécanismes rotatifs tels que des moteurs, des réacteurs, des pompes, des turbomachines, etc. La source de vibrations 20 selon l’invention est en particulier rotative. The vibration source 20 can be any part of any device capable of undergoing instantaneous deformations, that is to say capable of vibrating and dissipating vibrational energy e v , for example under the effect of rotational movements, shocks produced by objects or other parts, displacements, etc. This type of vibration source is found in particular in mechanical systems comprising rotary mechanisms such as motors, reactors, pumps, turbomachines, etc. The vibration source 20 according to the invention is in particular rotary.
L’énergie vibratoire ev émise par une telle source est apte à se propager, de proche en proche, à travers les éléments du milieu environnant sous forme d’onde de sorte qu’un « pont vibratoire » ou encore « chemin vibratoire » est créé entre la source de la vibration et les éléments du milieu traversés par ladite onde. L’énergie vibratoire ev dissipée par la source de vibration 20 est ainsi apte à se propager depuis la source de vibrations 20 vers la source rayonnante 30, c’est-à-dire transférée à ladite source rayonnante 30. The vibrational energy e v emitted by such a source is capable of propagating, step by step, through the elements of the surrounding medium in the form of a wave so that a “vibratory bridge” or even “vibratory path” is created between the source of the vibration and the elements of the medium through which said wave passes. The vibrational energy e v dissipated by the vibration source 20 is thus able to propagate from the vibration source 20 towards the radiating source 30, that is to say transferred to said radiating source 30.
La source rayonnante 30, est quant à elle, tout élément du milieu susceptible de générer des ondes acoustiques à partir de l’énergie vibratoire ev de la source de vibrations. La capacité de la source rayonnante 30 à générer des ondes acoustiques à partir de l’énergie vibratoire ev dépend de sa sensibilité à la(aux) fréquence(s) de(s) l’onde(s) produites à partir des vibrations. The radiating source 30, for its part, is any element of the medium capable of generating acoustic waves from the vibrational energy e v of the vibration source. The capacity of the radiating source 30 to generate acoustic waves from the vibrational energy e v depends on its sensitivity to the frequency (s) of the wave (s) produced from the vibrations.
L’intensité avec laquelle sont perçues ces ondes acoustiques dépend de la structure ainsi que de la nature du matériau dont est faite la source rayonnante 30. À titre d’exemple, le son émis par une plaque en métal, par exemple en aluminium, soumise à une vibration sera perçu plus clairement que le son émis par une plaque faite en plastique. En effet, dans un cas l’énergie vibratoire ev est transformée en des pics de résonance liés à des modes de vibration dans l’aluminium, tandis que dans l’autre cas ladite énergie ev sera plus facilement absorbée dans le plastique, celui-ci étant capable d’atténuer les vibrations. Cela étant, l’intensité avec laquelle sont perçues les ondes acoustiques dépend également de la forme de la source rayonnante, de la présence ou non d’ouvertures à ses extrémités, de ses dimensions, etc. The intensity with which these acoustic waves are perceived depends on the structure as well as on the nature of the material from which the radiating source is made 30. For example, the sound emitted by a metal plate, for example aluminum, subjected to a vibration will be perceived more clearly than the sound emitted by a plate made of plastic. Indeed, in one case the vibrational energy e v is transformed into resonance peaks linked to vibration modes in aluminum, while in the other case said energy e v will be more easily absorbed in plastic, that -this being able to attenuate the vibrations. However, the intensity with which the acoustic waves are perceived also depends on the shape of the radiating source, the presence or absence of openings at its ends, its dimensions, etc.
Comme cela est également illustré sur la figure 1 b, l’ensemble selon l’invention comprend également au moins un organe compressible 40 en contact avec ladite source de vibrations 20 et ladite source rayonnante 30. Autrement dit, l’organe compressible 40 est lié de manière vibratoire aussi bien à la source de vibrations 20 qu’à la source rayonnante 30.  As also illustrated in FIG. 1 b, the assembly according to the invention also comprises at least one compressible member 40 in contact with said source of vibrations 20 and said radiating source 30. In other words, the compressible member 40 is linked in a vibratory manner both at the source of vibrations 20 and at the radiating source 30.
Selon l’invention, l’organe compressible 40 est monté compressé entre ladite source de vibration 20 et ladite source rayonnante 30 de sorte à amortir les ondes acoustiques. Incidemment, l’énergie vibratoire ev apportée par la source de vibrations 20 permet à l’organe compressible 40 de se déformer par compression/décompression. En effet, l’énergie vibratoire ev est emmagasinée, c’est- à-dire absorbée, par l’organe compressible 40 puis transformée, au moins en partie, en énergie potentielle de déformation ePd ce qui résulte en la déformation de l’organe compressible 40. L’énergie vibratoire ev se retrouve répartie en sortie entre une(des) fréquence(s) vibratoire(s) principale(s) fa,P et des fréquences vibratoires secondaires fa, s de sorte qu’elle est non seulement atténuée mais également étalée sur une gamme de fréquences plus large. According to the invention, the compressible member 40 is mounted compressed between said vibration source 20 and said radiating source 30 so as to dampen the acoustic waves. Incidentally, the vibrational energy e v provided by the vibration source 20 allows the compressible member 40 to deform by compression / decompression. Indeed, the vibrational energy e v is stored, that is to say absorbed, by the compressible member 40 then transformed, at least in part, into potential energy of deformation e P d which results in the deformation of the compressible member 40. The vibrational energy e v is distributed at the output between one (s) main vibrational frequency (s) f a, P and secondary vibrational frequencies fa, s so that it is not only attenuated but also spread over a wider frequency range.
L’organe compressible 40 étant en contact avec la source rayonnante 30, cette énergie vibratoire ev est certes transférée à la source rayonnante 30 mais les ondes acoustiques susceptibles d’être générées par ladite source rayonnante 30 sont amorties car l’énergie vibratoire ev est atténuée et étalée en fréquences. Une fois que l’énergie vibratoire ev a été transférée à la source rayonnante 30, l’organe compressible 40 reprend alors sa configuration initiale, de même que l’ensemble 10. The compressible member 40 being in contact with the radiating source 30, this vibratory energy e v is certainly transferred to the radiating source 30 but the acoustic waves capable of being generated by said radiating source 30 are damped because the vibrational energy e v is attenuated and spread in frequencies. Once the vibrational energy e v has been transferred to the radiating source 30, the compressible member 40 then resumes its initial configuration, as does the assembly 10.
L’organe compressible 40 peut avantageusement être fait d’un élastomère, de préférence de type thermoplastique, ce dernier étant élastique et ayant un faible coût. The compressible member 40 can advantageously be made of an elastomer, preferably of the thermoplastic type, the latter being elastic and having a low cost.
Avantageusement, dans la configuration de l’invention, la source de vibrations 20 et la source rayonnante 30 peuvent être liées mécaniquement, même de façon rigide, sans que cela nuise au bon fonctionnement de l’ensemble 10 selon l’invention. En effet, l’atténuation de l’énergie vibratoire ev est rendue possible par l’intermédiaire de l’organe compressible 40 de sorte qu’en présence dudit organe compressible 40, il n’est pas obligatoire de découpler mécaniquement la source de vibrations 20 et la source rayonnante 30. L’ensemble 10 peut ainsi comprendre une source de vibrations 20 et une source rayonnante 30 liées mécaniquement. Advantageously, in the configuration of the invention, the vibration source 20 and the radiating source 30 can be linked mechanically, even rigidly, without this affecting the proper functioning of the assembly 10 according to the invention. Indeed, the attenuation of the vibratory energy e v is made possible by the intermediary of the compressible member 40 so that in the presence of said compressible member 40, it is not compulsory to mechanically decouple the source of vibrations 20 and the radiating source 30. The assembly 10 can thus comprise a source of vibrations 20 and a radiating source 30 mechanically linked.
L’organe compressible 40 peut être monté indifféremment sur la source de vibrations 20 ou sur la source rayonnante 30. En effet, ce n’est pas tant la surface depuis laquelle s’étend l’organe compressible 40 qui importe dans le cadre de l’invention, mais le fait que ledit organe compressible 40 soit en contact avec la source de vibrations 20 et la source rayonnante 30 et monté compressé entre lesdites sources 20, 30. The compressible member 40 can be mounted either on the vibration source 20 or on the radiating source 30. Indeed, it is not so much the surface from which the compressible member 40 extends that matters in the context of the invention, but the fact that said compressible member 40 is in contact with the vibration source 20 and the radiating source 30 and mounted compressed between said sources 20, 30.
Avantageusement, l’organe compressible 40 peut être monté sur une portion support 42, issue indifféremment de la source de vibrations 20 et s’étendant vers la source rayonnante 30 ou, de la source rayonnante 30 et s’étendant vers la source de vibrations 20. Cette portion support 42 permet de réduire localement l’écart entre lesdites sources 20 et 30 selon la distance séparant la source de vibrations 20 et la source rayonnante 30. De préférence, la portion support 42 présente une forme cylindrique, qui convient mieux à la propagation des ondes acoustiques. Il n’est pas obligatoire que la portion support 42 soit faite du même matériau que la source dont elle est issue. Advantageously, the compressible member 40 can be mounted on a support portion 42, either from the vibration source 20 and extending towards the radiating source 30 or, from the radiating source 30 and extending towards the vibration source 20 This support portion 42 makes it possible to locally reduce the difference between said sources 20 and 30 depending on the distance separating the vibration source 20 and the radiating source 30. Preferably, the support portion 42 has a cylindrical shape, which is better suited to the propagation of acoustic waves. It is not mandatory that the support portion 42 be made of the same material as the source from which it originates.
Avantageusement, l’organe compressible 40 est localisé en une ou différentes zones discrètes, dites zones d’amortissement, et, au niveau de la ou desdites zones d’amortissement, la source de vibration 20 est séparée de la source rayonnante 30 par une distance, d, inférieure à une longueur, dite longueur à l’état de repos, de l’organe compressible 40 lorsque ledit organe est dans une configuration décompressée, avant montage. Advantageously, the compressible member 40 is located in one or different discrete zones, called damping zones, and, at the level of said damping zone or zones, the vibration source 20 is separated from the radiating source 30 by a distance , d, less than a length, called length in the rest state, of the compressible member 40 when said member is in a decompressed configuration, before mounting.
En principe, lesdites zones d’amortissements peuvent être réparties de n’importe quelle façon. Cela dit, leur répartition spatiale peut être déterminée en fonction de la position de nœuds/lignes nodales et/ou de ventres/lignes ventrales des vibrations qui existent dans la pièce lorsque les zones d’amortissements ne sont pas implémentées. Les nœuds/lignes nodales se forment à des emplacements définis et fixes où les vibrations de même fréquence et de même intensité produites par la source de vibration 20 s’annulent parfaitement de sorte que les vibrations disparaissent. Les ventres/lignes ventrales, en revanche, se forment à des emplacements, également définis et fixes, où les vibrations de même fréquence et de même intensité produites par la source de vibration 20 s’additionnent de sorte que les vibrations sont amplifiées. La position des lignes ventrales dépend de celle des lignes nodales. In principle, said depreciation areas can be distributed in any way. That said, their spatial distribution can be determined based on the position of nodes / nodal lines and / or bellies / ventral lines of the vibrations that exist in the room when the damping zones are not implemented. The nodes / nodal lines are formed at defined and fixed locations where the vibrations of the same frequency and the same intensity produced by the vibration source 20 cancel each other out perfectly so that the vibrations disappear. Bellies / belly lines, on the other hand, form at locations, also defined and fixed, where vibrations of the same frequency and the same intensity produced by the vibration source 20 add up so that the vibrations are amplified. The position of the ventral lines depends on that of the nodal lines.
Avantageusement, les zones d’amortissement peuvent donc être situées au niveau des ventres/lignes ventrales. Les zones d’amortissement peuvent être positionnées selon deux configurations. Dans une première configuration, les zones d’amortissement peuvent être positionnées au niveau d’un ventre/ligne ventrale associée à une fréquence donnée. Dans ce cas, les ondes acoustiques générées par la source rayonnante 30 à partir des vibrations produites à cette fréquence seront significativement amorties. Dans une seconde configuration, les zones d’amortissement peuvent être positionnées au niveau de plusieurs ventres/lignes ventrales de manière à cibler plusieurs fréquences données, voire une gamme de fréquences. Dans un tel cas, toutes les ondes acoustiques générées par la source rayonnante 30 à partir des vibrations produites à ces fréquences seront amorties. Advantageously, the damping zones can therefore be located at the level of the bellies / ventral lines. The cushioning zones can be positioned in two configurations. In a first configuration, the damping zones can be positioned at the level of a belly / ventral line associated with a given frequency. In this case, the acoustic waves generated by the radiating source 30 from the vibrations produced at this frequency will be significantly damped. In a second configuration, the damping zones can be positioned at the level of several bellies / ventral lines so as to target several given frequencies, or even a range of frequencies. In such a case, all the acoustic waves generated by the radiating source 30 from the vibrations produced at these frequencies will be damped.
Avantageusement, encore, l’ensemble 10 comprend un nombre de zones d’amortissement adapté à l’intensité des vibrations. En plus de la possibilité de cibler la(es) fréquence(s) vibratoire(s) d’intérêt selon la position relative des zones d’amortissement par rapport aux lignes ventrales, il est également possible d’ajuster l’énergie vibratoire ev qui peut être atténuée, et donc l’amplitude vibratoire transférée à la source rayonnante 30. En effet, on comprend bien que plus le nombre de zones d’amortissement est élevé et plus l’énergie vibratoire ev pouvant être atténuée est élevée. En d’autres termes, le nombre de zones d’amortissement permet de contrôler l’amortissement des ondes acoustiques. Par exemple, dans le cas d’un ensemble 10 comprenant une source de vibrations 20 rotative qui tourne à vitesse constante autour de son axe de rotation, et de laquelle s’étend un organe compressible 40 réparti angulairement au niveau de différentes zones d’amortissement localisées autour dudit axe de rotation, l’intensité des vibrations varie en fonction de la vitesse de rotation. Le nombre de zones d’amortissement peut être ajusté en fonction de la vitesse de rotation de sorte que l’amortissement soit adapté à l’intensité des vibrations. Certaines applications peuvent nécessiter quatre zones d’amortissement ou plus, tandis que d’autres n’en nécessiteront que deux. Advantageously, again, the assembly 10 comprises a number of damping zones adapted to the intensity of the vibrations. In addition to the possibility of targeting the vibration frequency (s) of interest according to the relative position of the damping zones relative to the ventral lines, it is also possible to adjust the vibrational energy e v which can be attenuated, and therefore the vibrational amplitude transferred to the radiating source 30. In fact, it is clear that the higher the number of damping zones and the higher the vibrational energy e v that can be attenuated. In other words, the number of damping zones makes it possible to control the damping of the acoustic waves. For example, in the case of an assembly 10 comprising a rotary vibration source 20 which rotates at constant speed around its axis of rotation, and from which extends a compressible member 40 angularly distributed at different damping zones located around said axis of rotation, the intensity of the vibrations varies as a function of the speed of rotation. The number of damping zones can be adjusted according to the speed of rotation so that the damping is adapted to the intensity of the vibrations. Some applications may require four or more amortization zones, while others will require only two.
En outre, l’organe compressible 40 peut avantageusement être en forme de croix. Préférentiellement, dans une telle configuration, la portion support 42 pourra également présenter une forme de croix. La forme en croix de l’organe compressible 40, et optionnellement de la portion support 42 a une influence immédiate sur la forme et l’emplacement des lignes ventrales et nodales. Revenons à l’exemple de l’ensembleIn addition, the compressible member 40 may advantageously be in the form of a cross. Preferably, in such a configuration, the support portion 42 may also have the shape of a cross. The cross shape of the compressible member 40, and optionally of the support portion 42 has an immediate influence on the shape and location of the ventral and nodal lines. Let's go back to the example of the whole
10 comprenant une source de vibrations 20 rotative. En l’espèce, en considérant que la croix comprend une première branche orientée vers l’axe de rotation de la source de vibrations 20 et une deuxième branche perpendiculaire à ladite première branche,10 comprising a rotary vibration source 20. In this case, considering that the cross comprises a first branch oriented towards the axis of rotation of the vibration source 20 and a second branch perpendicular to said first branch,
11 devient alors possible de cibler aussi bien les lignes ventrales radiales que les lignes ventrales angulaires. Par conséquent, cela permet d’avoir accès à un nombre plus élevé de fréquences vibratoires. It then becomes possible to target both the radial ventral lines and the angular ventral lines. Therefore, this allows access to a higher number of vibration frequencies.
Exemple de réalisation de l’invention sous la forme d’un générateur de flux d’air Example of embodiment of the invention in the form of an air flow generator
La figure 2 illustre un générateur de flux d’air 1 permettant d’aspirer et de souffler de l’air. Le générateur de flux d’air 1 comprend un bloc moteur 2 et un bloc de commande électronique 3 situés dans le prolongement l’un de l’autre le long d’un axe longitudinal principal X (illustré par une ligne en pointillés). Le bloc de commande électronique 3 est ainsi positionné pour alimenter le bloc moteur 2 tout en limitant les nuisances magnétiques générées par ses propres éléments internes qui seront décrits plus loin. Figure 2 illustrates an air flow generator 1 for sucking and blowing air. The air flow generator 1 comprises a motor unit 2 and an electronic control unit 3 located in the extension of one another along a main longitudinal axis X (illustrated by a dotted line). The electronic control unit 3 is thus positioned to power the engine unit 2 while limiting the magnetic nuisance generated by its own internal elements which will be described later.
Le bloc moteur 2 consiste en un moteur électrique sans balais, appelé encore moteur électrique à commutation électronique. Il est apte à entraîner en rotation une roue de ventilation 28 par l’intermédiaire d’un arbre de sortie 260 dudit bloc moteur 2, s’étendant selon ledit axe longitudinal X. The motor unit 2 consists of a brushless electric motor, also called an electric motor with electronic commutation. It is able to rotate a ventilation wheel 28 via an output shaft 260 of said engine block 2, extending along said longitudinal axis X.
Le bloc moteur 2 comporte principalement un stator 24 muni d’un bobinage d’excitation et un rotor 26, porteur de l’arbre de sortie 260 apte à entraîner la roue de ventilation 28. Le stator 24 est rendu solidaire d’un dissipateur de chaleur 32 du bloc de commande électronique 3, et le rotor 26 est agencé autour du stator 24 pour être entraîné en rotation sous l’effet de champs magnétiques générés par le bobinage et des aimants associés au rotor. The engine block 2 mainly comprises a stator 24 provided with an excitation winding and a rotor 26, carrying the output shaft 260 capable of driving the ventilation wheel 28. The stator 24 is made integral with a heat sink heat 32 of the electronic control unit 3, and the rotor 26 is arranged around the stator 24 to be driven in rotation under the effect of magnetic fields generated by the winding and magnets associated with the rotor.
Le stator 24 présente une forme de révolution autour de l’axe longitudinal principal X. Le stator 24 comporte un carter présentant une paroi centrale annulaire 240 qui délimite le contour d’un alésage interne 242, et dont la face externe est prolongée par une pluralité de dents 244 agencées radialement en étoile. The stator 24 has a shape of revolution around the main longitudinal axis X. The stator 24 comprises a casing having an annular central wall 240 which delimits the contour of an internal bore 242, and the external face of which is extended by a plurality of teeth 244 arranged radially in a star.
Le bobinage d’excitation est composé de plusieurs phases, comportant chacune au moins un enroulement de fil 246, dont les sorties sont raccordées électriquement à des moyens d’alimentation ici non représentés (seuls les moyens de raccordement 248 sont visibles). Le stator 24 comporte ici douze dents bobinées en triphasé. L’enroulement de fil est réalisé autour des dents 244, chaque dent portant un élément de bobinage. The excitation winding is composed of several phases, each comprising at least one wire winding 246, the outputs of which are electrically connected to supply means here not shown (only the connection means 248 are visible). The stator 24 here has twelve teeth wound in three phase. The wire winding is carried out around the teeth 244, each tooth carrying a winding element.
Le rotor 26 présente une forme de cloche, avec une couronne annulaire 264 et une paroi de fermeture 262, ajourée, disposée à une extrémité de ladite couronne. La paroi de fermeture peut prendre une forme plane sensiblement perpendiculaire à l’axe de la couronne ou bien une forme incurvée en dégagement de la couronne, et elle porte en son centre l’arbre de sortie moteur 260. The rotor 26 has a bell shape, with an annular crown 264 and a perforated closure wall 262, disposed at one end of said crown. The closure wall can take a planar shape substantially perpendicular to the axis of the crown or else a curved shape in disengagement from the crown, and it carries in its center the motor output shaft 260.
La couronne 264 présente un diamètre supérieur au diamètre extérieur du stator 24, de sorte que le rotor 26 peut venir en recouvrement du stator. La couronne présente une face interne qui est tournée vers le stator dans cette position de recouvrement, et une pluralité d’aimants permanents 266 est disposée sur cette face interne de la couronne du rotor. The crown 264 has a diameter greater than the outside diameter of the stator 24, so that the rotor 26 can come to cover the stator. The crown has an internal face which faces the stator in this covering position, and a plurality of permanent magnets 266 is arranged on this internal face of the rotor crown.
Lorsque le bloc moteur 2 est assemblé, le stator 24 est disposé dans le corps du rotor délimité par la couronne 264. Le rotor et le stator sont ainsi agencés pour que les aimants permanents 266, portés par le rotor 26, soient constamment disposés dans le champ magnétique généré par les bobines du stator 24 lorsque celles-ci sont alimentées en courant, de manière à générer un mouvement de rotation du rotor autour du stator. Incidemment, le stator 24 et le rotor 26 sont agencés de sorte que la paroi de fermeture 262 du rotor est tournée vers la roue de ventilation 28 et que le stator est disposé, à l’opposé, en regard du dissipateur de chaleur 32. When the engine block 2 is assembled, the stator 24 is disposed in the body of the rotor delimited by the crown 264. The rotor and the stator are thus arranged so that the permanent magnets 266, carried by the rotor 26, are constantly arranged in the magnetic field generated by the stator 24 coils when these are supplied with current, so as to generate a rotational movement of the rotor around the stator. Incidentally, the stator 24 and the rotor 26 are arranged so that the closing wall 262 of the rotor faces the ventilation wheel 28 and that the stator is arranged, opposite, opposite the heat sink 32.
Outre sa fonction de dissipateur, le dissipateur de chaleur 32 remplit la fonction d’articulation de l’arbre moteur 260. Il remplit en outre ici les fonctions de mise à la masse et l’amélioration de la CEM. In addition to its dissipative function, the heat sink 32 performs the function of articulation of the motor shaft 260. It also fulfills here the functions of grounding and improvement of the EMC.
Pour cela, par exemple, le dissipateur de chaleur 32 comprend une platine 320, de forme sensiblement circulaire, et un fût 322 disposé en saillie de la platine et présentant un canal interne 324 débouchant sensiblement au centre de la platine. La platine 320 s’étend dans un plan sensiblement perpendiculaire à l’axe de révolution du canal interne du fût. Le fût 322, sensiblement cylindrique, est apte à être logé dans l’alésage interne 242 du stator 24 et à recevoir l’arbre de sortie moteur 260 solidaire du rotor 26. De préférence, la platine 320 présente une forme discoïdale, mais celle-ci peut prendre d’autres formes, par exemple rectangulaire, carrée, elliptique, etc. For this, for example, the heat sink 32 comprises a plate 320, of substantially circular shape, and a barrel 322 projecting from the plate and having an internal channel 324 opening out substantially at the center of the plate. The plate 320 extends in a plane substantially perpendicular to the axis of revolution of the internal channel of the barrel. The barrel 322, which is substantially cylindrical, is capable of being housed in the internal bore 242 of the stator 24 and of receiving the motor output shaft 260 integral with the rotor 26. Preferably, the plate 320 has a discoidal shape, but this- this can take other forms, for example rectangular, square, elliptical, etc.
Le dissipateur de chaleur 32 assure le positionnement correct du rotor 26 par rapport au stator 24. Le stator 24 et le dissipateur de chaleur 32 sont fixés l’un à l’autre. Le stator est disposé autour du fût 322, en étant au contact de la face externe dudit fût, tandis que le rotor 26 est reçu, par l’intermédiaire de l’arbre de sortie 260 dont il est solidaire, dans le canal interne 324 du fût. The heat sink 32 ensures the correct positioning of the rotor 26 relative to the stator 24. The stator 24 and the heat sink 32 are fixed to each other. The stator is arranged around the barrel 322, being in contact with the external face of said barrel, while the rotor 26 is received, by means of the output shaft 260 of which it is integral, in the internal channel 324 of the was.
Un ou plusieurs roulements 80, 82 peuvent être insérés dans le dissipateur de chaleur 32 en particulier dans le fût 322 pour servir de guide de rotation à l’arbre de sortie 260 entraîné par ailleurs en rotation par le rotor 26. Ce(s) roulement(s) peut(vent) être un(des) roulement(s) à billes, mais il(s) peut(vent) prendre la forme d’un(de) roulement(s) à rouleaux, à aiguilles, ou autres. One or more bearings 80, 82 can be inserted in the heat sink 32 in particular in the barrel 322 to serve as a rotation guide for the output shaft 260 also driven in rotation by the rotor 26. This (s) bearing (s) can (wind) be a ball bearing (s), but it (s) can (wind) take the form of a roller, needle, or other bearing (s).
Autrement dit, l’arbre de sortie 260, porté par le rotor 26, est monté à rotation à l’intérieur du fût 322 du support moteur par l’intermédiaire du ou des roulements 80, 82. In other words, the output shaft 260, carried by the rotor 26, is mounted for rotation inside the barrel 322 of the motor support by means of the bearing or bearings 80, 82.
La platine 320 et le fût 322 forment une pièce monobloc ce qui contribue à une bonne CEM. Préférentiellement, le dissipateur de chaleur 32 est en aluminium, de telle sorte que l’on associe pour cette pièce des caractéristiques de légèreté et de bonne conduction thermique. Le dissipateur de chaleur 32 peut être relié à la masse électrique. The plate 320 and the barrel 322 form a single piece which contributes to good EMC. Preferably, the heat sink 32 is made of aluminum, so that light weight and good characteristics are combined for this part. thermal conduction. The heat sink 32 can be connected to the electrical ground.
A l’opposé du ou des roulements 80, 82, la roue de ventilation 28 du générateur de flux d’air 1 est rendue solidaire de l’extrémité libre de l’arbre de sortie 260 du moteur. Elle comporte, disposées à sa périphérie, une pluralité d’ailettes 280 et un capot 282. La rotation du rotor 26 entraîne en rotation la roue de ventilation 28 qui contribue à produire de l’air pulsé par l’intermédiaire des ailettes. Unlike the bearing or bearings 80, 82, the ventilation wheel 28 of the air flow generator 1 is made integral with the free end of the output shaft 260 of the engine. It comprises, arranged at its periphery, a plurality of fins 280 and a cover 282. The rotation of the rotor 26 rotates the ventilation wheel 28 which contributes to producing pulsed air by means of the fins.
Le bloc moteur 2 est supporté au moyen d’un support moteur 22 présentant ici et de manière non limitative une forme sensiblement circulaire. The engine block 2 is supported by means of an engine support 22 having here and without limitation a substantially circular shape.
Comme cela peut être mieux vu à la figure 3, le support moteur 22 comprend une partie de montage 222 configurée pour être fixée à un boîtier HVAC. À ce titre, la partie de montage 222 comporte de nombreuses zones de fixation. La partie de montage 222 comporte deux portions, une portion centrale 222a et une portion périphérique 222b, toutes deux disposées coaxialement avec un orifice central 224. La portion périphérique 222b est destinée à être fixée à un boîtier HVAC. As can best be seen in Figure 3, the engine mount 22 includes a mounting portion 222 configured to be attached to an HVAC package. As such, the mounting part 222 includes numerous fixing zones. The mounting part 222 comprises two portions, a central portion 222a and a peripheral portion 222b, both arranged coaxially with a central orifice 224. The peripheral portion 222b is intended to be fixed to an HVAC box.
Le support moteur 22 est lié mécaniquement au dissipateur de chaleur 32 de façon rigide en particulier au niveau de la portion centrale 222a. Plus précisément, le support moteur 22 et le dissipateur de chaleur 32 sont vissées l’un à l’autre de sorte que le dissipateur de chaleur 32 se trouve en contact avec le support moteur 22 notamment au niveau de puits de vissage 228. Il est notamment plaqué, au moins en partie, sur le support moteur 22. Le plaquage est facilité au moyen de plots de positionnement 230 répartis angulairement et/ou de manière concentrique en bordure de la portion centrale 222a. Ainsi, lorsque le rotor 26 tourne, les zones de fixation situées au niveau du support moteur 22 sont autant de source de vibrations pour le dissipateur de chaleur 32. Un découplage vibratoire est donc nécessaire. The engine support 22 is mechanically linked to the heat sink 32 rigidly, in particular at the level of the central portion 222a. More specifically, the engine support 22 and the heat sink 32 are screwed to each other so that the heat sink 32 is in contact with the engine support 22 in particular at the level of the screwing well 228. It is in particular plated, at least in part, on the motor support 22. Plating is facilitated by means of positioning pads 230 distributed angularly and / or concentrically at the edge of the central portion 222a. Thus, when the rotor 26 rotates, the attachment zones located at the level of the motor support 22 are all sources of vibration for the heat sink 32. Vibratory decoupling is therefore necessary.
Avantageusement, le support moteur 22 comprend un premier, un deuxième et un troisième moyen de découplage acoustique 226a, 226b et 226c. Les moyens de découplage acoustique 226a, 226b et 226c sont disposés de manière concentrique et/ou radiale autour de l’orifice central 224 ce qui permet de réduire les vibrations induites par le bloc moteur 2 au niveau des zones de fixations de la partie de montage 222. À cet égard, ils sont, de préférence, faits en matière plastique, et très préférentiellement faits en élastomère, par exemple en silicone. Le premier moyen de découplage acoustique 226a comprend des éléments de forme généralement elliptique répartis angulairement sur le pourtour de l’orifice central 224 et en contact avec le fût 322. Ces éléments reliés de manière vibratoire au fût 322 induisent une première atténuation des vibrations induites par le bloc moteur 2. Le deuxième moyen de découplage acoustique 226b est situé au niveau de rainures formées à l’intérieur de la portion centrale 222a et forme un chemin de découplage depuis le premier moyen de découplage acoustique 226a vers le troisième moyen de découplage acoustique 226c. Le troisième moyen de découplage acoustique 226c est annulaire et disposé de façon coaxiale entre la portion centrale 222a et la portion périphérique 222b. Il réduit encore les vibrations induites par le bloc moteur 2 au niveau du fût 322. Advantageously, the engine support 22 comprises first, second and third acoustic decoupling means 226a, 226b and 226c. The acoustic decoupling means 226a, 226b and 226c are arranged concentrically and / or radially around the central orifice 224 which makes it possible to reduce the vibrations induced by the engine block 2 at the fixing zones of the mounting part 222. In this regard, they are preferably made of plastic, and very preferably made of elastomer, for example silicone. The first acoustic decoupling means 226a comprises elements of generally elliptical shape distributed angularly around the periphery of the central orifice 224 and in contact with the barrel 322. These elements vibratively connected to the barrel 322 induce a first attenuation of the vibrations induced by the engine block 2. The second acoustic decoupling means 226b is located at the level of grooves formed inside the central portion 222a and forms a decoupling path from the first acoustic decoupling means 226a to the third acoustic decoupling means 226c . The third acoustic decoupling means 226c is annular and arranged coaxially between the central portion 222a and the peripheral portion 222b. It further reduces the vibrations induced by the engine block 2 at the barrel 322.
Les moyens de découplage acoustique 226a, 226b et 226c ne permettent pas d’amortir les vibrations induites par le moteur sur le dissipateur de chaleur 32, à plus forte raison car le dissipateur de chaleur 32 est métallique. D’autres moyens de d’amortissement sont nécessaires. Ces moyens sont décrits dans la suite. The acoustic decoupling means 226a, 226b and 226c do not allow the vibrations induced by the motor to be damped on the heat sink 32, all the more so since the heat sink 32 is metallic. Other means of depreciation are required. These means are described below.
Pour ce qui est du bloc de commande électronique 3, il comprend en plus de la platine 320 et du fût 322, une carte électronique de commande 34 et un couvercle 36. Lorsque le bloc de commande électronique 3 est assemblé, la carte électronique 34, le dissipateur de chaleur 32 et le couvercle 36 sont maintenus solidaires par l’intermédiaire de moyens de fixation traversant (non illustrés), par exemple, des vis. Ainsi, l’électronique contenue dans le bloc de commande électronique 3 est avantageusement rapprochée dudit bloc moteur 2. As for the electronic control unit 3, it comprises, in addition to the plate 320 and the barrel 322, an electronic control card 34 and a cover 36. When the electronic control unit 3 is assembled, the electronic card 34, the heat sink 32 and the cover 36 are held integral by means of fixing means passing through (not shown), for example, screws. Thus, the electronics contained in the electronic control unit 3 are advantageously brought closer to said engine unit 2.
Le couvercle 36 est creux et représente l’enveloppe externe du bloc de commande électronique 3. Il participe à la dissipation thermique. Le couvercle 36 comprend un volume intérieur approprié lui permettant d’accueillir la carte électronique de commande 34 en épousant les contours de ladite carte électronique 34. Ainsi, lorsque le bloc électronique de commande 3 est assemblé, la carte électronique 34 est intégralement intégrée dans le volume intérieur et est ainsi protégée de l’environnement extérieur. En l’occurrence, le couvercle 36 est la pièce la plus susceptible de générer des ondes acoustiques. The cover 36 is hollow and represents the external envelope of the electronic control unit 3. It participates in the heat dissipation. The cover 36 includes an appropriate interior volume allowing it to accommodate the electronic control card 34 by matching the contours of said electronic card 34. Thus, when the electronic control unit 3 is assembled, the electronic card 34 is fully integrated in the interior volume and is thus protected from the external environment. In this case, the cover 36 is the part most likely to generate acoustic waves.
La carte électronique de commande 34 comprend un ou plusieurs éléments de commande et/ou connecteurs à des circuits externes. Elle est destinée à l’alimentation du bloc moteur 2. Les éléments de commande dégagent de la chaleur qui doit être dissipée au risque de provoquer une détérioration de la carte électronique de commande 34. De manière classique la carte électronique exige des températures de fonctionnement limitées, par exemple 120 ou 150°C. The electronic control card 34 comprises one or more control elements and / or connectors to external circuits. It is intended for food from the engine block 2. The control elements give off heat which must be dissipated at the risk of causing damage to the electronic control card 34. Conventionally, the electronic card requires limited operating temperatures, for example 120 or 150 ° vs.
À cet égard, la carte électronique 34 peut être couplée thermiquement au dissipateur de chaleur 32, ici métallique, par l’intermédiaire d’une pâte thermique permettant de refroidir efficacement ladite carte électronique 34 par conduction thermique. Le dissipateur de chaleur 32 intègre plusieurs fonctions parmi lesquelles le refroidissement des composants de ladite carte électronique 34 et le support du bloc de commande électronique 3. In this regard, the electronic card 34 can be thermally coupled to the heat sink 32, here metallic, by means of a thermal paste making it possible to effectively cool said electronic card 34 by thermal conduction. The heat sink 32 integrates several functions including the cooling of the components of said electronic card 34 and the support of the electronic control unit 3.
La platine 320 du dissipateur de chaleur 32 forme un logement destiné à accueillir la carte électronique de commande 34. Le logement présente une forme, dans le cas d’espèce rectangulaire, épousant les contours de la carte électronique 34. La surface intérieure du logement 320 est globalement plane. Elle présente néanmoins quelques excavations adaptées aux éléments traversant de ladite carte électronique 34 et permettant un contact étroit entre la carte électronique 34 et ledit logement 320. The plate 320 of the heat sink 32 forms a housing intended to accommodate the electronic control card 34. The housing has a shape, in this case rectangular, matching the contours of the electronic card 34. The interior surface of the housing 320 is generally planar. It nevertheless has some excavations adapted to the elements passing through said electronic card 34 and allowing close contact between the electronic card 34 and said housing 320.
De préférence, le dissipateur de chaleur 32 peut être directement relié à la masse de la carte électronique 34, ce qui, combiné au fait qu’il soit réalisé en métal, permet de bloquer des rayonnements électromagnétiques émis par la carte électronique, ces rayonnements pouvant perturber le fonctionnement du bloc moteur 2. Preferably, the heat sink 32 can be directly connected to the ground of the electronic card 34, which, combined with the fact that it is made of metal, makes it possible to block electromagnetic radiation emitted by the electronic card, this radiation being able to disturb the operation of the engine block 2.
Cela étant, tout est fait pour conserver l’électronique de commande à proximité du rotor 26 et du stator 24 d’une part aux fins de l’alimentation électrique du stator, et d’autre part afin d'éviter un découplage électromagnétique du bloc moteur 2 et du bloc de commande électronique 3 pour les raisons citées ci-avant. Incidemment, le support moteur 22 et le dissipateur de chaleur 32 étant situés à l’interface entre les deux blocs 2, 3, il n’est pas possible de les découpler de manière acoustique. However, everything is done to keep the control electronics close to the rotor 26 and the stator 24 on the one hand for the purpose of powering the stator, and on the other hand to avoid electromagnetic decoupling of the block engine 2 and the electronic control unit 3 for the reasons mentioned above. Incidentally, the motor support 22 and the heat sink 32 being located at the interface between the two blocks 2, 3, it is not possible to decouple them acoustically.
Lorsque le générateur de flux d’air 1 est en fonctionnement, le support moteur 22 génère des vibrations induites par la rotation du rotor 26 au niveau de son orifice central 224 qui accueille le fût 322, lui-même lié au rotor par le(s) roulement(s) 80, 82. Le dissipateur de chaleur 32 et le support moteur 22 étant en contact, le bloc de commande électronique 3 est exposé aux vibrations induites par le bloc moteur 2. En cela, le support moteur 22 forme une source de vibrations 20 en particulier apte à dissiper une énergie vibratoire ev, tandis que le dissipateur de chaleur 32, en étant métallique, consiste en une source rayonnante 30 susceptible de générer des ondes acoustiques à partir de ladite énergie vibratoire ev. When the air flow generator 1 is in operation, the engine support 22 generates vibrations induced by the rotation of the rotor 26 at its central orifice 224 which receives the barrel 322, itself linked to the rotor by the (s ) bearing (s) 80, 82. The heat sink 32 and the engine support 22 being in contact, the electronic control unit 3 is exposed to the vibrations induced by the engine unit 2. In this, the motor support 22 forms a source of vibrations 20 in particular capable of dissipating vibrational energy e v , while the heat sink 32, being metallic, consists of a radiating source 30 capable of generating acoustic waves from of said vibrational energy e v .
Selon une première variante de cet exemple de réalisation de l’invention illustrée à la figure 3, les organes compressibles 40, en forme de pastilles, sont liés au support moteur 22. Une fois le générateur de flux d’air 1 assemblé, ces organes compressibles 40 sont en outre en contact avec le dissipateur de chaleur 32. According to a first variant of this exemplary embodiment of the invention illustrated in FIG. 3, the compressible members 40, in the form of pellets, are linked to the motor support 22. Once the air flow generator 1 has been assembled, these members compressible 40 are further in contact with the heat sink 32.
Selon l’exemple illustré, les organes compressibles 40 sont disposés sur des portions cylindriques 220, dites « plots », issues du support moteur 22. Comme illustré sur la figure 3, ces plots 220 s’étendent axialement depuis la portion centrale 222a parallèlement avec l’axe longitudinal principal X. En outre, ils s’élèvent suffisamment pour réduire localement l’écart entre le support moteur 22 et le dissipateur de chaleur 32. Leur longueur peut même être supérieure à l’écart entre le support moteur 22 et le dissipateur de chaleur 32. En effet, comme on peut le distinguer sur la figure 3, la portion centrale 222a présente des cavités qui créent des écarts localement entre le support moteur 22 et le dissipateur de chaleur 32, en particulier la platine 320. According to the example illustrated, the compressible members 40 are arranged on cylindrical portions 220, called “studs”, coming from the motor support 22. As illustrated in FIG. 3, these studs 220 extend axially from the central portion 222a in parallel with the main longitudinal axis X. In addition, they rise enough to locally reduce the distance between the motor support 22 and the heat sink 32. Their length may even be greater than the distance between the motor support 22 and the heat sink 32. In fact, as can be distinguished in FIG. 3, the central portion 222a has cavities which locally create gaps between the motor support 22 and the heat sink 32, in particular the plate 320.
Les organes compressibles 40 sont répartis angulairement et de manière régulière depuis la portion centrale 222a (qui à titre de rappel est située en vis-à-vis du dissipateur de chaleur 32) et forment des zones d’amortissement. Cette configuration est particulièrement adaptée à la propagation en forme concentrique des ondes vibratoires créées par le bloc moteur 2 depuis l’orifice central 224 du support moteur. De plus, les lignes ventrales/nodales associées à ces vibrations se propagent également de manière concentrique de sorte que la répartition angulaire desdits organes compressibles 40 permet de les cibler une par une. The compressible members 40 are distributed angularly and regularly from the central portion 222a (which, as a reminder, is located opposite the heat sink 32) and form damping zones. This configuration is particularly suitable for the concentric propagation of the vibratory waves created by the engine block 2 from the central orifice 224 of the engine support. In addition, the ventral / nodal lines associated with these vibrations also propagate concentrically so that the angular distribution of said compressible members 40 makes it possible to target them one by one.
Ici, les organes compressibles 40 et les plots 220 sont situés à la même distance de l’axe longitudinal principal X, et donc l’axe du dissipateur de chaleur 32. Dans le mode illustré, on comprendra que, seule une fréquence vibratoire donnée est ciblée et que seules les ondes acoustiques générées par le dissipateur de chaleur 32 à partir des vibrations produites à cette fréquence seront amorties. Les organes compressibles 40 et les plots 220 peuvent être situés des distances différentes de l’axe longitudinal principal X. Dans ce cas, plusieurs fréquences vibratoires sont ciblées, l’ensemble des ondes acoustiques générées par le dissipateur de chaleur 32 à partir des vibrations produites à ces fréquences seront amorties. Here, the compressible members 40 and the pads 220 are located at the same distance from the main longitudinal axis X, and therefore the axis of the heat sink 32. In the illustrated mode, it will be understood that only a given vibrational frequency is targeted and that only the acoustic waves generated by the heat sink 32 from the vibrations produced at this frequency will be damped. The compressible members 40 and the studs 220 can be located at different distances from the main longitudinal axis X. In this case, several vibration frequencies are targeted, all of the Acoustic waves generated by the heat sink 32 from the vibrations produced at these frequencies will be damped.
De manière particulièrement avantageuse, les organes compressibles 40 (et les zones d’amortissement) sont au nombre de trois, ce qui permet un amortissement approprié des ondes acoustiques compte tenu du fait que le dissipateur de chaleur 32 est métallique et de l’intensité des vibrations générées par le bloc moteur 2, sachant que ce dernier effectue environ 2300 tours/minute en moyenne en fonctionnement normal. Ce nombre d’organes compressibles 40 n’est pas limitatif et doit être adapté en fonction des caractéristiques du bloc moteur 2. In a particularly advantageous manner, the compressible members 40 (and the damping zones) are three in number, which allows appropriate damping of the acoustic waves taking into account the fact that the heat sink 32 is metallic and the intensity of the vibrations generated by the engine block 2, knowing that the latter performs approximately 2300 rpm on average in normal operation. This number of compressible members 40 is not limiting and must be adapted according to the characteristics of the engine block 2.
Les organes compressibles 40 sont montés compressés entre ledit support moteur 22 et ledit dissipateur de chaleur 32 de sorte à amortir lesdites ondes acoustiques susceptibles d’être générées par le dissipateur de chaleur 32. À cet égard, ils sont préférablement faits en élastomère thermoplastique. Les organes compressibles 40 sont ainsi liés de manière vibratoire aussi bien au support moteur 22 qu’au dissipateur de chaleur 22. The compressible members 40 are mounted compressed between said motor support 22 and said heat sink 32 so as to dampen said acoustic waves capable of being generated by the heat sink 32. In this regard, they are preferably made of thermoplastic elastomer. The compressible members 40 are thus vibratively linked both to the motor support 22 and to the heat sink 22.
Ainsi, lors des rotations du rotor 26 autour du stator 24, les organes compressibles 40 étant en contact avec le dissipateur de chaleur 32, l’énergie vibratoire ev dissipée par le support moteur 22 est atténuée et étalée puis transférée au dissipateur de chaleur 32 de sorte que les ondes acoustiques susceptibles d’être générées par ledit dissipateur 32 sont amorties. Thus, during the rotations of the rotor 26 around the stator 24, the compressible members 40 being in contact with the heat sink 32, the vibrational energy e v dissipated by the motor support 22 is attenuated and spread out then transferred to the heat sink 32 so that the acoustic waves capable of being generated by said dissipator 32 are damped.
De manière avantageuse, les organes compressibles 40 sont en forme de croix. Préférentiellement, il en est de même pour les plots 220. La forme en croix des organes compressibles 40 et de la portion support 42 permet de cibler aussi bien les lignes ventrales radiales que les lignes ventrales angulaires. Par conséquent, cela permet d’avoir accès à un nombre plus élevé de fréquences vibratoires. Advantageously, the compressible members 40 are in the form of a cross. Preferably, the same is true for the studs 220. The cross shape of the compressible members 40 and of the support portion 42 makes it possible to target both the radial ventral lines and the angular ventral lines. Therefore, this allows access to a higher number of vibration frequencies.
Selon une deuxième variante de cet exemple de réalisation de l’invention illustrée à la figure 4, les organes compressibles 40 s’étendent depuis le dissipateur de chaleur 32. According to a second variant of this exemplary embodiment of the invention illustrated in FIG. 4, the compressible members 40 extend from the heat sink 32.
Dans cette variante, les organes compressibles 40 s’étendent parallèlement à l’axe longitudinal principal X depuis des cavités présentes sur une face du dissipateur de chaleur orientée en vis-à-vis du support moteur 22. Ils s’étendent plus précisément depuis des excavations (adaptées aux éléments traversant de ladite carte électronique 34) pratiquées dans le dissipateur de chaleur 32. En outre, ils s’élèvent suffisamment pour qu’une fois le générateur de flux d’air 1 assemblé, ils soient en contact avec le support moteur 22, sans aucun moyen supplémentaire (notamment sans plot). In this variant, the compressible members 40 extend parallel to the main longitudinal axis X from cavities present on one face of the heat sink oriented opposite the motor support 22. They extend more precisely from excavations (adapted to the traversing elements of said electronic card 34) formed in the heat sink 32. In addition, they rise enough so that once the air flow generator 1 assembled, they are in contact with the motor support 22, without any additional means (in particular without plot).
De manière similaire à la première variante, les organes compressibles 40 sont répartis angulairement et de manière régulière depuis le dissipateur de chaleur 32 et forment des zones d’amortissement. Similarly to the first variant, the compressible members 40 are distributed angularly and regularly from the heat sink 32 and form damping zones.
Les organes compressibles se présentent chacun sous la forme de deux secteurs angulaires de cylindre qui suivent le pourtour des excavations pratiquées dans le dissipateur de chaleur 32 et qui sont reliés par une portion de matière fine s’étendant sensiblement au niveau d’une zone médiane desdits secteurs. The compressible members are each in the form of two angular cylinder sectors which follow the periphery of the excavations made in the heat sink 32 and which are connected by a portion of fine material extending substantially at the level of a median zone of said sectors.
Dans cette configuration, bien que les organes compressibles 40 soient situés à la même distance de l’axe longitudinal principal X, les deux secteurs étant situés à des positions radiales différentes, ce sont au moins deux fréquences vibratoires différentes qui peuvent être ciblées. Ainsi, on comprend bien que même dans leur forme, les organes compressibles 40 peuvent influencer le nombre de fréquences auxquelles les ondes acoustiques peuvent être amorties. In this configuration, although the compressible members 40 are located at the same distance from the main longitudinal axis X, the two sectors being located at different radial positions, it is at least two different vibration frequencies that can be targeted. Thus, it is well understood that even in their form, the compressible members 40 can influence the number of frequencies at which the acoustic waves can be damped.
Ici encore, les organes compressibles 40 sont montés compressés entre ledit support moteur 22 et ledit dissipateur de chaleur 32 de sorte à amortir lesdites ondes acoustiques susceptibles d’être générées par le dissipateur de chaleur 32. Here again, the compressible members 40 are mounted compressed between said motor support 22 and said heat sink 32 so as to damp said acoustic waves likely to be generated by the heat sink 32.
De manière particulièrement avantageuse, les organes compressibles 40 sont au nombre de trois, ce qui permet un amortissement approprié des ondes acoustiques du bloc moteur 2. Ils sont de préférence faits du même matériau que les moyens de découplage, notamment d’un élastomère, par exemple du silicone. In a particularly advantageous manner, the compressible members 40 are three in number, which allows appropriate damping of the acoustic waves of the engine block 2. They are preferably made of the same material as the decoupling means, in particular an elastomer, by example of silicone.
En référence à la figure 5a, une comparaison de deux spectres acoustiques centrés autour de la fréquence 4 kHz est illustrée. With reference to FIG. 5a, a comparison of two acoustic spectra centered around the frequency 4 kHz is illustrated.
Le spectre en gris foncé est associé aux ondes acoustiques générées par un support moteur 22 et un dissipateur de chaleur 32 d’un générateur de flux d’air sans l’invention et, le spectre en gris clair est associé aux ondes acoustiques générées par un ensemble 1 selon l’exemple illustré à la figure 3 de l’invention. Le dissipateur de chaleur 32 en aluminium émet des ondes acoustiques selon un spectre acoustique Sa pour lequel le pic d’émission principal est situé à une fréquence fa,P principale sensiblement centrée à 4 kHz. The dark gray spectrum is associated with the acoustic waves generated by a motor support 22 and a heat sink 32 of an air flow generator without the invention and, the light gray spectrum is associated with the acoustic waves generated by a assembly 1 according to the example illustrated in FIG. 3 of the invention. The aluminum heat sink 32 emits acoustic waves according to an acoustic spectrum Sa for which the main emission peak is located at a main frequency f a, P substantially centered at 4 kHz.
On peut clairement voir que les ondes acoustiques générées par l’ensemble 1 selon l’invention sont amorties, puisqu’à cette fréquence le pic d’émission est lui-même amorti, i.e. atténué et étalé sur une plus grande plage fréquentielle. En fonctionnement, un générateur de flux d’air 1 équipé d’un tel ensemble induit beaucoup moins de nuisances sonores que celles qui seraient causées par les sons purs émis en l’absence dudit ensemble.  It can clearly be seen that the acoustic waves generated by the assembly 1 according to the invention are damped, since at this frequency the emission peak is itself damped, i.e. attenuated and spread over a greater frequency range. In operation, an air flow generator 1 equipped with such an assembly induces much less noise than those which would be caused by the pure sounds emitted in the absence of said assembly.
Sur la figure 5b est illustrée une comparaison de cinq spectres acoustiques ayant un pic d’émission associé à la huitième harmonique du spectre acoustique de la figure 5a.  In FIG. 5b is illustrated a comparison of five acoustic spectra having an emission peak associated with the eighth harmonic of the acoustic spectrum of FIG. 5a.
On peut remarquer que le pic d’émission associé à cette huitième harmonique, appartenant aux fréquence fa, s dites secondaires, est également amorti.  It can be noted that the emission peak associated with this eighth harmonic, belonging to the frequencies fa, s called secondary, is also damped.
De cet exemple de réalisation particulier, on comprend que, la source rayonnante 30 est susceptible de vibrer en étant reliée à une source de vibrations autre que la source de vibrations 20 portant/en contact avec l’organe compressible. De même, la source de vibrations 20 peut être elle-même soumise à des vibrations générées par la source rayonnante 30. Quel que soit ce qui génère la vibration de l’une ou de l’autre, l’insertion repose sur l’utilisation d’un élément vibrant, à la source de vibration 20, pour amortir les vibrations d’une source de bruit, à savoir la source rayonnante 30, en intercalant un organe compressible entre les deux.  From this particular exemplary embodiment, it is understood that, the radiating source 30 is capable of vibrating by being connected to a source of vibrations other than the source of vibrations 20 carrying / in contact with the compressible member. Likewise, the vibration source 20 can itself be subjected to vibrations generated by the radiating source 30. Whatever generates the vibration of one or the other, the insertion is based on the use a vibrating element, at the vibration source 20, to dampen the vibrations of a noise source, namely the radiating source 30, by interposing a compressible member between the two.

Claims

REVENDICATIONS
1. Ensemble (10) comprenant : 1. Set (10) comprising:
- une source de vibrations (20) apte à dissiper une énergie vibratoire (ev),- a vibration source (20) capable of dissipating vibrational energy (e v ),
- une source rayonnante (30) susceptible de générer des ondes acoustiques à partir de ladite énergie vibratoire (ev), - a radiating source (30) capable of generating acoustic waves from said vibratory energy (e v ),
- au moins un organe compressible (40) en contact avec ladite source de vibrations (20) et ladite source rayonnante (30),  - at least one compressible member (40) in contact with said source of vibrations (20) and said radiating source (30),
ledit ensemble (10) étant caractérisé en ce que l’organe compressible (40) est monté compressé entre ladite source de vibrations (20) et ladite source rayonnante (30) de sorte à amortir lesdites ondes acoustiques.  said assembly (10) being characterized in that the compressible member (40) is mounted compressed between said vibration source (20) and said radiating source (30) so as to damp said acoustic waves.
2. Ensemble (10) selon la revendication 1 , dans lequel la source de vibrations (20) est rotative. 2. Assembly (10) according to claim 1, wherein the vibration source (20) is rotatable.
3. Ensemble (10) selon l’une quelconque des revendications 1 ou 2, dans lequel la source de vibrations (20) et la source rayonnante (30) sont liées mécaniquement de façon rigide. 3. An assembly (10) according to any one of claims 1 or 2, in which the vibration source (20) and the radiating source (30) are mechanically rigidly linked.
4. Ensemble (10) selon l’une quelconque des revendications précédentes, dans lequel l’organe compressible (40) est localisé en une ou différentes zones réparties de manière discrètes, dites zones d’amortissement, et, au niveau de la ou desdites zones d’amortissement, la source de vibration (20) est séparée de la source rayonnante (30) par une distance, d, inférieure à une longueur, dite longueur à l’état de repos, de l’organe compressible (40) lorsque ledit organe est dans une configuration décompressée. 4. Assembly (10) according to any one of the preceding claims, in which the compressible member (40) is located in one or different zones discretely distributed, called damping zones, and, at the level of said one or more. damping zones, the vibration source (20) is separated from the radiating source (30) by a distance, d, less than a length, called the length in the rest state, of the compressible member (40) when said member is in a decompressed configuration.
5. Ensemble (10) selon l’une quelconque des revendications précédente, dans lequel l’organe compressible (40) est un élastomère, de préférence en silicone. 5. Assembly (10) according to any one of the preceding claims, in which the compressible member (40) is an elastomer, preferably made of silicone.
6. Ensemble (10) selon l’une quelconque des revendications précédentes, dans lequel l’organe compressible (40) est monté indifféremment sur la source de vibrations (20) ou la source rayonnante (30). 6. An assembly (10) according to any one of the preceding claims, in which the compressible member (40) is mounted either on the vibration source (20) or the radiating source (30).
7. Ensemble (10) selon l’une quelconque des revendications précédentes destiné à équiper un générateur de flux d’air (1 ) pour un système de refroidissement pour véhicule automobile, caractérisé en ce que la source de vibrations (20) est formée par tout ou partie d’un support moteur (22) et la source rayonnante (30) est formée par tout ou partie d’un dissipateur de chaleur (32). 7. Assembly (10) according to any one of the preceding claims intended to equip an air flow generator (1) for a cooling system for a motor vehicle, characterized in that the vibration source (20) is formed by all or part of a motor support (22) and the radiating source (30) is formed by all or part of a heat sink (32).
8. Ensemble (10) selon la revendication 7, comprenant plusieurs organes compressibles (40) s’étendant depuis une surface (222a) dudit support moteur (22) en vis-à-vis du dissipateur de chaleur (32). 8. An assembly (10) according to claim 7, comprising a plurality of compressible members (40) extending from a surface (222a) of said motor support (22) facing the heat sink (32).
9. Ensemble (10) selon l’une des revendications 8, dans lequel le support moteur comprend ladite source de vibrations (20), configurée pour permettre une fixation du moteur, et une partie de montage, configurée pour être fixée à un support, ladite source de vibration et la partie de montage étant reliées par des moyens de découplage acoustique, lesdits moyens de découplage acoustique et les organes compressibles (40) étant réalisés dans le même matériau. 9. An assembly (10) according to one of claims 8, in which the motor support comprises said vibration source (20), configured to allow the motor to be fixed, and a mounting part, configured to be fixed to a support, said vibration source and the mounting part being connected by acoustic decoupling means, said acoustic decoupling means and the compressible members (40) being made of the same material.
10. Générateur de flux d’air (1 ) équipé d’un ensemble selon l’une quelconque des revendications 7 à 9, ledit générateur d’air (1 ) comprenant un bloc moteur (2) électrique comportant la source de vibrations (20) et un bloc de commande électronique (3) comportant la source rayonnante (30). 10. Air flow generator (1) equipped with an assembly according to any one of claims 7 to 9, said air generator (1) comprising an electric motor unit (2) comprising the source of vibrations (20 ) and an electronic control unit (3) comprising the radiating source (30).
EP19806029.5A 2018-10-23 2019-10-16 Assembly for damping acoustic energy, air flow generator for a cooling system provided with such an assembly, and associated cooling system Pending EP3871320A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1859801A FR3087594B1 (en) 2018-10-23 2018-10-23 ASSEMBLY DEDICATED TO THE AMORTIZATION OF ACOUSTIC ENERGY, GENERATOR OF AIR FLOWS FOR A COOLING SYSTEM EQUIPPED WITH SUCH ASSEMBLY AND ASSOCIATED COOLING SYSTEM
PCT/FR2019/052453 WO2020084224A1 (en) 2018-10-23 2019-10-16 Assembly for damping acoustic energy, air flow generator for a cooling system provided with such an assembly, and associated cooling system

Publications (1)

Publication Number Publication Date
EP3871320A1 true EP3871320A1 (en) 2021-09-01

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EP (1) EP3871320A1 (en)
CN (1) CN112913124A (en)
FR (1) FR3087594B1 (en)
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Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1038642B (en) * 1956-04-05 1958-09-11 Siemens Ag Device for preventing the transfer of the noise-generating torsional vibrations of the stand, which occur in electric motors, in particular single-phase motors, to the motor support
US7251100B1 (en) * 1998-11-13 2007-07-31 Hitachi Global Storage Technologies Netherlands B.V. Mounting interface for a spindle motor
FR2833775B1 (en) * 2001-12-17 2004-07-23 Valeo Climatisation RING FOR HOLDING AND DECOUPLING THE ELECTRIC MOTOR IN ITS SUPPORT AND ASSEMBLY METHOD
DE20201601U1 (en) * 2002-02-02 2003-06-18 Ebm Werke Gmbh & Co Kg Vibration-isolating bracket of an electric motor
KR200457138Y1 (en) * 2009-03-11 2011-12-07 이더테크놀로지(주) Vibration-free Heat Radiation Apparatus for Cooling Chipset
DE102015116350A1 (en) * 2015-09-28 2017-03-30 Valeo Klimasysteme Gmbh Mounting module for mounting a fan motor and heating, ventilation and / or air conditioning module
JP2018014844A (en) * 2016-07-22 2018-01-25 株式会社ケーヒン Blower motor unit for air-conditioning
KR101873455B1 (en) * 2016-11-03 2018-07-02 뉴모텍(주) Blower Motor
JP6271054B1 (en) * 2017-02-17 2018-01-31 三菱電機株式会社 Rotating electric machine for vehicles

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US20210410339A1 (en) 2021-12-30
FR3087594B1 (en) 2021-10-22
FR3087594A1 (en) 2020-04-24
CN112913124A (en) 2021-06-04
WO2020084224A1 (en) 2020-04-30

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