EP3871320A1 - 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 - Google Patents
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 associeInfo
- 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
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.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Motor Or Generator Frames (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Mechanical Engineering (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1859801A FR3087594B1 (fr) | 2018-10-23 | 2018-10-23 | 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 |
| PCT/FR2019/052453 WO2020084224A1 (fr) | 2018-10-23 | 2019-10-16 | 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 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3871320A1 true EP3871320A1 (fr) | 2021-09-01 |
Family
ID=65444050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19806029.5A Pending EP3871320A1 (fr) | 2018-10-23 | 2019-10-16 | 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 |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11973408B2 (fr) |
| EP (1) | EP3871320A1 (fr) |
| CN (1) | CN112913124A (fr) |
| FR (1) | FR3087594B1 (fr) |
| WO (1) | WO2020084224A1 (fr) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1038642B (de) * | 1956-04-05 | 1958-09-11 | Siemens Ag | Einrichtung zur Verhuetung des UEbertrittes der bei Elektromotoren, insbesondere Einphasenmotoren, auftretenden geraeuscherzeugenden Drehschwingungen des Staenders auf den Motortraeger |
| US7251100B1 (en) * | 1998-11-13 | 2007-07-31 | Hitachi Global Storage Technologies Netherlands B.V. | Mounting interface for a spindle motor |
| FR2833775B1 (fr) * | 2001-12-17 | 2004-07-23 | Valeo Climatisation | Bague de maintien et de decouplage du moteur electrique dans son support et procede d'assemblage |
| DE20201601U1 (de) * | 2002-02-02 | 2003-06-18 | ebm Werke GmbH & Co. KG, 74673 Mulfingen | Schwingungsisolierende Halterung eines Elektromotors |
| KR200457138Y1 (ko) * | 2009-03-11 | 2011-12-07 | 이더테크놀로지(주) | 진동이 없는 칩셋 냉각용 방열 장치 |
| DE102015116350A1 (de) * | 2015-09-28 | 2017-03-30 | Valeo Klimasysteme Gmbh | Befestigungsmodul zur Befestigung eines Gebläsemotors sowie Heizungs-, Lüftungs- und/oder Klimaanlagenmodul |
| JP2018014844A (ja) * | 2016-07-22 | 2018-01-25 | 株式会社ケーヒン | 空調用ブロアモータユニット |
| KR101873455B1 (ko) * | 2016-11-03 | 2018-07-02 | 뉴모텍(주) | 블로워 모터 |
| JP6271054B1 (ja) * | 2017-02-17 | 2018-01-31 | 三菱電機株式会社 | 車両用回転電機 |
| JP6651491B2 (ja) * | 2017-11-27 | 2020-02-19 | シナノケンシ株式会社 | 送風装置 |
| JP7091795B2 (ja) * | 2018-04-12 | 2022-06-28 | 株式会社デンソー | ファンモータ |
-
2018
- 2018-10-23 FR FR1859801A patent/FR3087594B1/fr active Active
-
2019
- 2019-10-16 WO PCT/FR2019/052453 patent/WO2020084224A1/fr not_active Ceased
- 2019-10-16 CN CN201980070282.3A patent/CN112913124A/zh active Pending
- 2019-10-16 US US17/287,396 patent/US11973408B2/en active Active
- 2019-10-16 EP EP19806029.5A patent/EP3871320A1/fr active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR3087594B1 (fr) | 2021-10-22 |
| WO2020084224A1 (fr) | 2020-04-30 |
| FR3087594A1 (fr) | 2020-04-24 |
| US11973408B2 (en) | 2024-04-30 |
| US20210410339A1 (en) | 2021-12-30 |
| CN112913124A (zh) | 2021-06-04 |
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