EP3221949A2 - Electric machine with an asymmetric rotor for use in a motor vehicle - Google Patents

Electric machine with an asymmetric rotor for use in a motor vehicle

Info

Publication number
EP3221949A2
EP3221949A2 EP15805592.1A EP15805592A EP3221949A2 EP 3221949 A2 EP3221949 A2 EP 3221949A2 EP 15805592 A EP15805592 A EP 15805592A EP 3221949 A2 EP3221949 A2 EP 3221949A2
Authority
EP
European Patent Office
Prior art keywords
rotor
stator
teeth
electric machine
section
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15805592.1A
Other languages
German (de)
French (fr)
Inventor
Yacine AYAD
Samir Guerbaoui
Abdou Salembere
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 de Controle Moteur SAS
Original Assignee
Valeo Systemes de Controle Moteur SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valeo Systemes de Controle Moteur SAS filed Critical Valeo Systemes de Controle Moteur SAS
Publication of EP3221949A2 publication Critical patent/EP3221949A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/24—Rotor cores with salient poles ; Variable reluctance rotors
    • H02K1/246—Variable reluctance rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations

Definitions

  • the present invention relates to an electric machine, and more particularly to an electric motor with variable reluctance or permanent magnets for application in a motor vehicle, in particular for an electric supercharger.
  • the invention also relates to an electric supercharger compressor for a motor vehicle, comprising such a variable reluctance motor or permanent magnets.
  • Such an electric supercharger is conventionally implemented in the air intake line of a combustion engine of a motor vehicle, upstream or downstream of a turbocharger.
  • a compressor can be implemented on a recirculation line of the exhaust gas of the internal combustion engine.
  • the electric supercharger conventionally comprises a wheel for compressing the air entering the compressor and a variable-reluctance electric machine or permanent magnets for driving the wheel in rotation.
  • the electric supercharger powered by an electric motor, has a very short response time. This makes it possible to increase the torque of the internal combustion engine at low speed, to compensate for the turbocharger response time and to improve the accelerations of the motor vehicle on which is mounted the internal combustion engine equipped with the electric supercharger.
  • the electric machine and for example the variable reluctance motor or permanent magnets used in such an electric supercharger is subjected to large amplitude vibrations due to variations in flux and electromagnetic forces, which are detrimental to comfort. of the driver of the motor vehicle.
  • the object of the present invention is to provide an electric machine, and for example an electric motor with variable reluctance or permanent magnets, improved for automotive application, in particular for electric supercharging compressor, not having at least some of the aforementioned drawbacks.
  • the invention proposes an electric machine and in particular an electric motor with variable reluctance or permanent magnets for application in a motor vehicle, in particular for an electric supercharger for a motor vehicle, comprising a rotor and a stator provided with radial teeth, at least one of the rotor and the stator having a cross section which can be divided into angular sectors of the same angle in the center and including a single radial tooth, at least one of said angular sectors being different from at least one of the other said angular sectors.
  • the noise emitted by the machine is shifted to the lower frequencies. Indeed, it limits the noisy phenomena related to the rotation of the rotor relative to the stator which have a frequency equal to a multiple of the rotor rotation frequency.
  • the overall noise emitted by the machine has higher harmonics for lower frequencies which are less uncomfortable for users, or that may be inaudible to some users.
  • the comfort of use of the engine is improved.
  • each of said angular sectors is different from the other said angular sectors
  • stator has a cross-section with symmetry of revolution
  • the rotor has a symmetrical cross section
  • the rotor and the stator have a cross-section which can be divided into angular sectors of same angle in the center and including a single radial tooth, at least one of said angular sectors of each of the rotor and of the stator being different from at least one other said angular sectors of the rotor, respectively of the stator;
  • the center of gravity of the rotor is located on its axis of rotation
  • At least one of the teeth of at least one of the rotor and the stator is different from the other teeth of the same one of the rotor and the stator;
  • the tooth is wider than the other teeth.
  • the invention relates to an electric supercharger compressor for a motor vehicle, comprising a compression wheel and an electric machine, for example an electric motor with variable reluctance or permanent magnets, as described above in all its combinations, to drive the compression wheel in rotation.
  • FIG. 1 shows a cross section of an electric machine of a supercharger for a motor vehicle
  • FIG. 1 is an enlargement of the rotor of the electric machine shown in Figure 1.
  • an electrical machine 10 essentially comprises a rotor 12 and a stator 14.
  • the rotor 12 is here mounted radially inside the stator 14.
  • the rotor 12 and the stator 14 are made of ferromagnetic metallic material.
  • the stator does not comprise here winding oriented in the longitudinal direction of the electric machine 10.
  • the rotor 12 has teeth 16 (hereinafter radially rotor teeth 16), oriented radially outward, here four in number .
  • the rotor teeth 16 are equidistributed angularly.
  • the stator 14 has for its teeth 18 (hereinafter statoric teeth 18) also radial, oriented in the opposite direction to the teeth 16 of the rotor 12.
  • stator teeth 18 are more numerous than the rotor teeth 16.
  • the stator 14 has six statoric teeth 18.
  • the statoric teeth 18 are angularly distributed.
  • Each of the stator teeth 18 is surrounded by a winding 20 or phase winding.
  • two opposite (or symmetrical) coils are electrically powered, they form electromagnets and cause the rotor 12 to rotate to align the rotor teeth 16 with the stator teeth 18 surrounded by the electrically powered coils.
  • the rotor 12 is rotated, the torque being produced by the tendency of the rotor to position itself so that the reluctance between a stator tooth and a rotor tooth is at a minimum. that is, the gap between these rotor and stator teeth is minimal.
  • the rotor 12 has a cross section that can be divided into four angular sectors S1-S4 of the same angle in the center, each angular sector S1 -S4 including a single rotor tooth 16.
  • Each of the angular sectors S1 -S4 here corresponds to a central angle of 90 °.
  • Each of said angular sectors S1-S4 is here different from each of the other angular sectors S1-S4. This allows to move to the lower frequencies, the noise emissions of the electrical machine, and for example the variable reluctance motor or permanent magnets, 10, especially in a frequency range inaudible to at least some users.
  • a noisy phenomenon, related to the rotation of the rotor 12 is limited and has a frequency greater than that of the rotation of the rotor 12, in particular equal to a multiple of the rotor rotation frequency 12.
  • the rotor teeth I 6 1 -I 6 4 are connected, in cross section, by distinct curves.
  • regular curves which are easier to make, are preferred.
  • the curve does not form, for example, sharp stops, these being fragile.
  • the curve does not form, preferably, notches on the radially outer surface of the rotor 12. In particular, the curve does not form wedge angles, which can create rotor failure primers 12.
  • the first and second rotor teeth I 6 1 , 16 2 are connected here, in cross-section, by a right-hand section 22.
  • rounded corners have been formed between the section 22 and the profile 24i, 24 2 of the first and second rotor teeth 16 1 , 16 2 , to prevent the formation of a fracture primer at these angles.
  • the second and third rotor teeth 16 2 , 163 are connected, in cross section, by a circular arc 26, open radially inwards.
  • rounded corners were formed between the arc 26 and the profile 24 2 , 24 3 of the second and third rotor teeth 162, 163 to prevent the formation of a fracture primer at these angles.
  • the third and fourth rotor teeth 163, 16 4 are connected, in cross-section, by a straight section 28, longer than the section of right 22 between the first and second rotor teeth 16i, I 6 2 .
  • rounded corners have been formed between the circular arc 26 and the profile 24 2 , 24 3 of the second and third rotor teeth 16 2 , 163 so as to avoid the formation of a fracture primer at these levels. angles.
  • first and fourth rotor teeth I 6 1 , 16 4 are connected, in cross section, by a circular arc 30 open radially outwards.
  • the profile of the first and fourth rotor teeth I 6 1 , 16 4 extend in the extension of the arc 30.
  • a rotor tooth 16 may be wider than the others, better still, each rotor tooth 16 may have a width different from the other rotor teeth 16.
  • the rotor 12 is arranged to maintain the center of gravity of the rotor 12 located on its axis of rotation, especially at its geometric center. This avoids the unbalance effects that could cause premature wear of the O-machine.
  • the rotor 12 and the stator 14 have cavities 32, 34, 36, respectively. These cavities 32, 34, 36 make it possible to reduce the rigidity of the rotor 12 and / or of the stator 14, which makes it possible to limit the noise emitted by the machine, and for example the variable reluctance motor or permanent magnets and / or lower the emission frequencies of these noises.
  • these cavities 32, 34 on the torque exerted on the rotor 12 are formed in the rotor 16 and stator 18, respectively, and open only at the two faces end of the rotor 12 and the stator 14.
  • the stator 14 also has on its radially outer surface cavities 36 which extend substantially in the longitudinal direction of the electrical machine 10 and which open at the two end faces of the stator 14 and on its radially outer surface.
  • the stator teeth 18 also present here, in cross-section, a chamfer 38.
  • the profile of the stator teeth 18 here have a base portion with two parallel sides, connected to the top of the stator teeth 18 by inclined surfaces relative to the two parallel sides of the base part.
  • the angle of inclination of these surfaces can in particular be greater than 1 °, more preferably greater than 3 °, and less than 10 °, more preferably less than 7 °.
  • chamfers 38 make it possible to limit the amplitude of the variations of magnetic flux when the rotor teeth 16 align with the stator teeth 18. Indeed, because of the presence of the chamfers 38, this variation of the magnetic flux is achieved less suddenly, which limits the noise emitted by the electric machine 10.
  • chamfers may be provided only on the rotor 12 or both on the rotor 12 and on the stator 14.
  • An electric machine and for example a variable reluctance motor or permanent magnet, as just described can be implemented in many applications in a motor vehicle. In particular, it can be implemented for a traction motor system.
  • the electric machine and for example the variable reluctance motor or permanent magnets as just described can be implemented in an electric supercharger for a motor vehicle, comprising a wheel of compression driven in rotation by the rotation of the motor rotor.
  • stator 14 can be received in a housing of the machine leaving empty spaces (or gaps) between the stator 14 and the housing, the empty spaces extending substantially in a longitudinal direction of the electric machine.
  • the stator and the housing of the machine then preferably define linear contact areas. These empty spaces between the stator and the housing of the machine can limit the noise radiated by the machine.
  • the stator 14 may have a cross section of generally polygonal shape, possibly having one or more cuts formed by the cavity or cavities 28 opening on the radially outer surface of the stator 14 and, preferably, rounded corners intended for in contact with the housing of the machine, which housing of the machine is preferably generally circular in cross section.
  • stator has a cross section with symmetry of revolution.
  • the stator 14 may have a cross-section that can be divided into angular sectors of same angle in the center and including a single radial tooth, at least one of said angular sectors being different from at least one of said other angular sectors, preferably each angular sector being different from the other angular sectors.
  • This also makes it possible to move the noise emissions of the electrical machine, and for example of the variable-reluctance motor or permanent magnets, to the higher frequencies, especially in a frequency range that is inaudible to at least some users.
  • the rotor may then have a cross-section with symmetry of revolution.
  • the rotor 12 and the stator 14 both have a cross-section which can be divided into angular sectors of same angle at the center and including a single radial tooth, at least one of said angular sectors of each of the rotor and the stator, being different from at least one of said other angular sectors of the rotor, respectively of the stator.
  • each of the angular sectors of the rotor and the stator are different from the other angular sectors of the rotor and the stator, respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Synchronous Machinery (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

The invention relates to an electric machine (10) and, for example, an electric motor with reluctance varied by permanent magnets, for use in a motor vehicle, in particular for an electric supercharger for a motor vehicle, comprising a rotor (12) and a stator (14) provided with radial teeth (16; 18), at least one of the rotor (12) and stator (14) having a cross-section which can be divided into angular segments (S1-S4) having the same angle at the centre and including a single radial tooth (161-164), at least one of the angular segments (S1-S4) being different from at least one of the other angular segments (S1-S4). The invention also relates to an electric supercharger for a motor vehicle, comprising a compression wheel and an electric machine(10) for rotating the compression wheel.

Description

MAC H I N E É LECTRIQU E À ROTOR ASYM ÉT RIQU E PO U R AP P LICATIO N DAN S U N VÉ H I C U LE AUTOMOB I LE  ASYM ROTOR MAC H I N E R A T E R A T IO N A R A T IO N P A R A T IO N THE VEHICLE
La présente invention concerne une machine électrique, et plus particulièrement un moteur électrique à reluctance variable ou aimants permanents pour application dans un véhicule automobile, notamment pour un compresseur électrique de suralimentation. L'invention se rapporte également à un compresseur électrique de suralimentation pour véhicule automobile, comportant un tel moteur à reluctance variable ou aimants permanents. The present invention relates to an electric machine, and more particularly to an electric motor with variable reluctance or permanent magnets for application in a motor vehicle, in particular for an electric supercharger. The invention also relates to an electric supercharger compressor for a motor vehicle, comprising such a variable reluctance motor or permanent magnets.
Il est connu de mettre en œuvre un compresseur électrique de suralimentation (en anglais « electric supercharger ») dans un circuit d'alimentation en air d'un moteur à combustion interne de véhicule automobile.  It is known to implement an electric supercharger in an air supply circuit of an internal combustion engine of a motor vehicle.
Un tel compresseur électrique de suralimentation est classiquement mis en œuvre dans la ligne d'admission d'air d'un moteur à combustion thermique d'un véhicule automobile, en amont ou en aval d'un turbocompresseur. En variante, ou au surplus comme décrit dans la demande FR-A-2 991 725 au nom de la Demanderesse, un tel compresseur peut être mis en œuvre sur une ligne de recirculation des gaz d'échappement du moteur à combustion interne.  Such an electric supercharger is conventionally implemented in the air intake line of a combustion engine of a motor vehicle, upstream or downstream of a turbocharger. Alternatively, or moreover as described in FR-A-2 991 725 in the name of the Applicant, such a compressor can be implemented on a recirculation line of the exhaust gas of the internal combustion engine.
Le compresseur de suralimentation électrique comporte de manière classique une roue destinée à comprimer l'air entrant dans le compresseur et une machine électrique à reluctance variable ou aimants permanents pour entraîner la roue en rotation.  The electric supercharger conventionally comprises a wheel for compressing the air entering the compressor and a variable-reluctance electric machine or permanent magnets for driving the wheel in rotation.
À la différence des turbocompresseurs, entraînés par les gaz d'échappement, le compresseur électrique de suralimentation, fonctionnant avec un moteur électrique, a un temps de réponse très court. Ceci permet de renforcer le couple du moteur à combustion interne à bas régime, de compenser le temps de réponse du turbocompresseur et améliore les accélérations du véhicule automobile sur lequel est monté le moteur à combustion interne muni du compresseur électrique de suralimentation. Unlike turbochargers, driven by exhaust gases, the electric supercharger, powered by an electric motor, has a very short response time. This makes it possible to increase the torque of the internal combustion engine at low speed, to compensate for the turbocharger response time and to improve the accelerations of the motor vehicle on which is mounted the internal combustion engine equipped with the electric supercharger.
Cependant, la machine électrique, et par exemple le moteur à reluctance variable ou aimants permanents mis en œuvre dans un tel compresseur électrique de suralimentation est soumis à des vibrations de grandes amplitudes du fait des variations de flux et de forces électromagnétiques, qui nuisent au confort du conducteur du véhicule automobile.  However, the electric machine, and for example the variable reluctance motor or permanent magnets used in such an electric supercharger is subjected to large amplitude vibrations due to variations in flux and electromagnetic forces, which are detrimental to comfort. of the driver of the motor vehicle.
En outre, notamment du fait du régime auquel est utilisé une telle machine électrique, un tel compresseur est bruyant.  In addition, particularly because of the speed at which such an electric machine is used, such a compressor is noisy.
Le but de la présente invention est de proposer une machine électrique, et par exemple un moteur électrique à reluctance variable ou aimants permanents, perfectionnée pour application automobile, notamment pour compresseur électrique de suralimentation, ne présentant pas au moins certains des inconvénients susmentionnés.  The object of the present invention is to provide an electric machine, and for example an electric motor with variable reluctance or permanent magnets, improved for automotive application, in particular for electric supercharging compressor, not having at least some of the aforementioned drawbacks.
À cette fin, l'invention propose une machine électrique et notamment un moteur électrique à reluctance variable ou aimants permanents pour application dans un véhicule automobile, notamment pour compresseur de suralimentation électrique pour véhicule automobile, comprenant un rotor et un stator munis de dents radiales, au moins l'un parmi le rotor et le stator présentant une section transversale pouvant être divisée en des secteurs angulaires de même angle au centre et incluant une unique dent radiale, au moins un desdits secteurs angulaires étant différent d'au moins un des autres dits secteurs angulaires.  To this end, the invention proposes an electric machine and in particular an electric motor with variable reluctance or permanent magnets for application in a motor vehicle, in particular for an electric supercharger for a motor vehicle, comprising a rotor and a stator provided with radial teeth, at least one of the rotor and the stator having a cross section which can be divided into angular sectors of the same angle in the center and including a single radial tooth, at least one of said angular sectors being different from at least one of the other said angular sectors.
Ainsi, on déplace en fréquence, vers les fréquences plus basses, le bruit émis par la machine. En effet, on limite ainsi les phénomènes bruyants liés à la rotation du rotor par rapport au stator qui présentent une fréquence égale à un multiple de la fréquence de rotation du rotor.  Thus, the noise emitted by the machine is shifted to the lower frequencies. Indeed, it limits the noisy phenomena related to the rotation of the rotor relative to the stator which have a frequency equal to a multiple of the rotor rotation frequency.
Le bruit globalement émis par la machine présente des harmoniques plus importantes pour des fréquences plus basses qui sont moins inconfortables pour les utilisateurs, voire qui peuvent être inaudibles pour certains utilisateurs. The overall noise emitted by the machine has higher harmonics for lower frequencies which are less uncomfortable for users, or that may be inaudible to some users.
Le confort d'utilisation du moteur s'en trouve amélioré.  The comfort of use of the engine is improved.
Selon différents modes de réalisation, qui pourront être pris ensemble ou séparément :  According to different embodiments, which can be taken together or separately:
- chacun desdits secteurs angulaires est différents des autres dits secteurs angulaires ;  each of said angular sectors is different from the other said angular sectors;
- le stator a une section transversale à symétrie de révolution ;  the stator has a cross-section with symmetry of revolution;
- le rotor a une section transversale à symétrie de révolution ;  the rotor has a symmetrical cross section;
- le rotor et le stator présentent une section transversale pouvant être divisée en des secteurs angulaires de même angle au centre et incluant une unique dent radiale, au moins un desdits secteurs angulaires de chacun du rotor et du stator, étant différente d'au moins un des autres dits secteurs angulaires du rotor, respectivement du stator ;  the rotor and the stator have a cross-section which can be divided into angular sectors of same angle in the center and including a single radial tooth, at least one of said angular sectors of each of the rotor and of the stator being different from at least one other said angular sectors of the rotor, respectively of the stator;
- deux dents successives d'au moins l'un parmi le rotor et le stator, sont reliées, en coupe transversale, par :  two successive teeth of at least one of the rotor and the stator are connected in cross section by:
- un arc de cercle ouvert radialement vers l'extérieur,  - a circular arc open radially outwards,
- un arc ce cercle ouvert radialement vers l'intérieur,  - an arc this circle open radially inwards,
- un tronçon de droite, les angles entre le tronçon de droite et le profil des dents successives étant de préférence arrondi ; - A right section, the angles between the right section and the profile of the successive teeth being preferably rounded;
- le centre de gravité du rotor est situé sur son axe de rotation ; - The center of gravity of the rotor is located on its axis of rotation;
- au moins l'une des dents de l'un au moins parmi le rotor et le stator est différentes des autres dents du même parmi le rotor et le stator ; et  at least one of the teeth of at least one of the rotor and the stator is different from the other teeth of the same one of the rotor and the stator; and
- la dent est plus large que les autres dents.  - the tooth is wider than the other teeth.
Selon un autre aspect, l'invention se rapporte à un compresseur électrique de suralimentation pour véhicule automobile, comportant une roue de compression et une machine électrique, par exemple un moteur électrique à reluctance variable ou aimants permanants, telle que décrite ci-avant dans toutes ses combinaisons, pour entraîner la roue de compression en rotation. Les figures annexées feront bien comprendre comment l'invention peut être réalisée, sur lesquelles : According to another aspect, the invention relates to an electric supercharger compressor for a motor vehicle, comprising a compression wheel and an electric machine, for example an electric motor with variable reluctance or permanent magnets, as described above in all its combinations, to drive the compression wheel in rotation. The appended figures will make it clear how the invention can be implemented, in which:
- la figure 1 représente une coupe transversale d'une machine électrique d'un compresseur de suralimentation pour véhicule automobile ; et  - Figure 1 shows a cross section of an electric machine of a supercharger for a motor vehicle; and
- la figure 2 est un agrandissement du rotor de la machine électrique représenté sur la figure 1 .  - Figure 2 is an enlargement of the rotor of the electric machine shown in Figure 1.
Comme illustré à la figure 1 , une machine électrique 10 comprend essentiellement un rotor 12 et un stator 14. Le rotor 12 est ici monté radialement à l'intérieure du stator 14. Le rotor 12 et le stator 14 sont en matériau métallique ferromagnétique. Notamment, le stator ne comprend pas ici de bobinage orienté selon la direction longitudinale de la machine électrique 10. Le rotor 12 présente des dents 16 (ci-après dents rotoriques 16) radiales, orientées radialement vers l'extérieur, ici au nombre de quatre. Les dents rotoriques 16 sont équiréparties angulairement. Le stator 14 présente quant à lui des dents 18 (ci-après dents statoriques 18) également radiales, orientées dans le sens opposé aux dents 16 du rotor 12. Classiquement les dents statoriques 18 sont plus nombreuses que les dents rotoriques 16. En l'espèce, le stator 14 présente six dents statoriques 18. Les dents statoriques 18 sont équiréparties angulairement. Chacune des dents statoriques 18 est entourée par un bobinage 20 ou bobinage de phase. Lorsque deux bobinages 20 opposés (ou symétriques) sont alimentés électriquement, ils forment des électroaimants et provoquent la rotation du rotor 12 pour aligner les dents rotoriques 16 avec les dents statoriques 18 entourées par les bobinages 20 alimentés électriquement. En commandant successivement l'alimentation des couples de bobinages 20 opposés, on entraine en rotation le rotor 12, le couple étant produit par la tendance du rotor à se positionner de façon que la réluctance entre une dent statorique et une dent rotorique soit minimum, c'est- à-dire que l'entrefer entre ces dents rotoriques et statoriques soit minimal.  As illustrated in FIG. 1, an electrical machine 10 essentially comprises a rotor 12 and a stator 14. The rotor 12 is here mounted radially inside the stator 14. The rotor 12 and the stator 14 are made of ferromagnetic metallic material. In particular, the stator does not comprise here winding oriented in the longitudinal direction of the electric machine 10. The rotor 12 has teeth 16 (hereinafter radially rotor teeth 16), oriented radially outward, here four in number . The rotor teeth 16 are equidistributed angularly. The stator 14 has for its teeth 18 (hereinafter statoric teeth 18) also radial, oriented in the opposite direction to the teeth 16 of the rotor 12. Classically the stator teeth 18 are more numerous than the rotor teeth 16. In the In this case, the stator 14 has six statoric teeth 18. The statoric teeth 18 are angularly distributed. Each of the stator teeth 18 is surrounded by a winding 20 or phase winding. When two opposite (or symmetrical) coils are electrically powered, they form electromagnets and cause the rotor 12 to rotate to align the rotor teeth 16 with the stator teeth 18 surrounded by the electrically powered coils. By successively controlling the supply of pairs of opposite windings, the rotor 12 is rotated, the torque being produced by the tendency of the rotor to position itself so that the reluctance between a stator tooth and a rotor tooth is at a minimum. that is, the gap between these rotor and stator teeth is minimal.
Ici, cependant, le rotor 12 présente une section transversale pouvant être divisée en quatre secteurs angulaires S1 -S4 de même angle au centre, chaque secteur angulaire S1 -S4 incluant une unique dent rotorique 16. Chacun des secteurs angulaires S1 -S4 correspond ici à un angle au centre de 90°. Chacun desdits secteurs angulaires S1 -S4 est ici différent de chacun des autres secteurs angulaires S1 -S4. Ceci permet de déplacer vers les fréquences plus graves, les émissions de bruit de la machine électrique, et par exemple du moteur à reluctance variable ou aimants permanents, 10, notamment dans un domaine de fréquences inaudibles pour au moins certains utilisateurs. On limite en effet ainsi qu'un phénomène bruyant, lié à la rotation du rotor 12, n'ait une fréquence supérieure à celle de la rotation du rotor 12, notamment égale à un multiple de la fréquence de rotation du rotor 12. Here, however, the rotor 12 has a cross section that can be divided into four angular sectors S1-S4 of the same angle in the center, each angular sector S1 -S4 including a single rotor tooth 16. Each of the angular sectors S1 -S4 here corresponds to a central angle of 90 °. Each of said angular sectors S1-S4 is here different from each of the other angular sectors S1-S4. This allows to move to the lower frequencies, the noise emissions of the electrical machine, and for example the variable reluctance motor or permanent magnets, 10, especially in a frequency range inaudible to at least some users. Indeed, a noisy phenomenon, related to the rotation of the rotor 12, is limited and has a frequency greater than that of the rotation of the rotor 12, in particular equal to a multiple of the rotor rotation frequency 12.
Ici, plus précisément, les dents rotoriques I 61-I 64 sont reliées, en section transversale, par des courbes distinctes. De préférence, on préfère des courbes régulières, plus faciles à réaliser. La courbe ne forme pas de préférence, par exemple, d'arrêtés vives, celles-ci étant fragiles. La courbe ne forme pas non plus, de préférence, d'encoches sur la surface radialement externe du rotor 12. Notamment la courbe ne forme pas d'angles en coin, qui peuvent créer des amorces de rupture du rotor 12. Here, more specifically, the rotor teeth I 6 1 -I 6 4 are connected, in cross section, by distinct curves. Preferably, regular curves, which are easier to make, are preferred. The curve does not form, for example, sharp stops, these being fragile. The curve does not form, preferably, notches on the radially outer surface of the rotor 12. In particular, the curve does not form wedge angles, which can create rotor failure primers 12.
Ainsi, comme cela est plus nettement visible à la figure 2, les première et deuxième dents rotoriques I 61, 162 sont reliées ici, en section transversale, par un tronçon de droite 22. Ici on a formé des angles arrondis entre le tronçon de droite 22 et le profil 24i, 242 des première et deuxième dents rotoriques 161 , 162, pour éviter la formation d'une amorce de rupture au niveau de ces angles. Thus, as is more clearly visible in FIG. 2, the first and second rotor teeth I 6 1 , 16 2 are connected here, in cross-section, by a right-hand section 22. Here rounded corners have been formed between the section 22 and the profile 24i, 24 2 of the first and second rotor teeth 16 1 , 16 2 , to prevent the formation of a fracture primer at these angles.
Les deuxième et troisième dents rotoriques 162, 163 sont reliées, en section transversale, par un arc de cercle 26, ouvert radialement vers l'intérieur. Ici aussi, on a formé des angles arrondis entre l'arc de cercle 26 et le profil 242, 243 des deuxième et troisième dents rotoriques 162, 163 pour éviter la formation d'une amorce de rupture au niveau de ces angles. The second and third rotor teeth 16 2 , 163 are connected, in cross section, by a circular arc 26, open radially inwards. Here too, rounded corners were formed between the arc 26 and the profile 24 2 , 24 3 of the second and third rotor teeth 162, 163 to prevent the formation of a fracture primer at these angles.
Les troisième et quatrième dents rotoriques 163, 164 sont reliées, en section transversale, par un tronçon de droite 28, plus long que le tronçon de droite 22 entre les première et deuxième dents rotoriques 16i, I 62. Encore une fois ici, on a formé des angles arrondis entre l'arc de cercle 26 et le profil 242, 243 des deuxième et troisième dents rotoriques 162, 163 pour éviter la formation d'une amorce de rupture au niveau de ces angles. The third and fourth rotor teeth 163, 16 4 are connected, in cross-section, by a straight section 28, longer than the section of right 22 between the first and second rotor teeth 16i, I 6 2 . Once again here, rounded corners have been formed between the circular arc 26 and the profile 24 2 , 24 3 of the second and third rotor teeth 16 2 , 163 so as to avoid the formation of a fracture primer at these levels. angles.
Enfin, les première et quatrième dents rotoriques I 61, 164 sont reliées, en section transversale, par un arc de cercle 30 ouvert radialement vers l'extérieur. Ici, le profil des première et quatrième dents rotoriques I 61, 164 s'étendent dans le prolongement de l'arc de cercle 30. Finally, the first and fourth rotor teeth I 6 1 , 16 4 are connected, in cross section, by a circular arc 30 open radially outwards. Here, the profile of the first and fourth rotor teeth I 6 1 , 16 4 extend in the extension of the arc 30.
Bien entendu, d'autres courbes peuvent être imaginées.  Of course, other curves can be imagined.
En variante ou au surplus de courbes différentes reliant les dents rotoriques, on peut obtenir des secteurs angulaires distincts en prévoyant des géométries différentes des dents rotoriques. Notamment, une dent rotorique 16 peut être plus large que les autres, mieux, chaque dent rotorique 16 peut présenter une largeur différente des autres dents rotoriques 16.  As a variant or in the surplus of different curves connecting the rotor teeth, it is possible to obtain distinct angular sectors by providing different geometries of the rotor teeth. In particular, a rotor tooth 16 may be wider than the others, better still, each rotor tooth 16 may have a width different from the other rotor teeth 16.
De préférence cependant, on s'arrange pour maintenir le centre de gravité du rotor 12 situé sur son axe de rotation, notamment en son centre géométrique. Ceci permet d'éviter les effets de balourd qui pourraient provoquer une usure prématurée de la machinel O.  Preferably, however, it is arranged to maintain the center of gravity of the rotor 12 located on its axis of rotation, especially at its geometric center. This avoids the unbalance effects that could cause premature wear of the O-machine.
Par ailleurs, comme illustré sur les figures, le rotor 12 et le stator 14 présentent des cavités 32, 34, 36, respectivement. Ces cavités 32, 34, 36 permettent de réduire la rigidité du rotor 12 et/ou du stator 14, ce qui permet de limiter le bruit émis par la machine, et par exemple le moteur à reluctance variable ou aimants permanents et/ou d'abaisser les fréquences d'émission de ces bruits. Par facilité de fabrication et pour limiter l'influence des cavités 32, 34 sur le couple exercé sur le rotor 12, celles-ci sont réalisées dans les dents rotoriques 16 et statoriques 18, respectivement, et ne débouchent qu'au niveau des deux faces d'extrémité du rotor 12 et du stator 14.  Moreover, as illustrated in the figures, the rotor 12 and the stator 14 have cavities 32, 34, 36, respectively. These cavities 32, 34, 36 make it possible to reduce the rigidity of the rotor 12 and / or of the stator 14, which makes it possible to limit the noise emitted by the machine, and for example the variable reluctance motor or permanent magnets and / or lower the emission frequencies of these noises. By ease of manufacture and to limit the influence of the cavities 32, 34 on the torque exerted on the rotor 12, these are formed in the rotor 16 and stator 18, respectively, and open only at the two faces end of the rotor 12 and the stator 14.
Ici, le stator 14 présente également sur sa surface radialement externe des cavités 36 qui s'étendent sensiblement selon la direction longitudinale de la machine électrique 10 et qui débouchent au niveau des deux faces d'extrémité du stator 14 et sur sa surface radialement externe. Les dents statoriques 18 présentent également ici, en section transversale, un chanfrein 38. En d'autres termes, le profil des dents statoriques 18 présentent ici une partie de base avec deux côtés parallèles, reliée au sommet des dents statoriques 18 par des surfaces inclinées par rapport aux deux côtés parallèles de la partie de base. L'angle d'inclinaison de ces surfaces (ou angle de chanfrein) peut notamment être supérieur à 1 °, de préférence encore supérieur à 3°, et inférieur à 10°, de préférence encore inférieur à 7°. Ces chanfreins 38 permettent de limiter l'amplitude des variations de flux magnétiques quand les dents rotoriques 16 s'alignent avec les dents statoriques 18. En effet, du fait de la présence des chanfreins 38, cette variation du flux magnétique est réalisée de manière moins brusque, ce qui permet de limiter le bruit émis par la machine électrique 10. En variante, de tels chanfreins peuvent être prévus uniquement sur le rotor 12 ou à la fois sur le rotor 12 et sur le stator 14. Here, the stator 14 also has on its radially outer surface cavities 36 which extend substantially in the longitudinal direction of the electrical machine 10 and which open at the two end faces of the stator 14 and on its radially outer surface. The stator teeth 18 also present here, in cross-section, a chamfer 38. In other words, the profile of the stator teeth 18 here have a base portion with two parallel sides, connected to the top of the stator teeth 18 by inclined surfaces relative to the two parallel sides of the base part. The angle of inclination of these surfaces (or chamfer angle) can in particular be greater than 1 °, more preferably greater than 3 °, and less than 10 °, more preferably less than 7 °. These chamfers 38 make it possible to limit the amplitude of the variations of magnetic flux when the rotor teeth 16 align with the stator teeth 18. Indeed, because of the presence of the chamfers 38, this variation of the magnetic flux is achieved less suddenly, which limits the noise emitted by the electric machine 10. Alternatively, such chamfers may be provided only on the rotor 12 or both on the rotor 12 and on the stator 14.
Une machine électrique, et par exemple un moteur à reluctance variable ou aimants permanents, 10 telle qu'elle vient d'être décrite peut être mis en œuvre dans de nombreuses applications dans un véhicule automobile. Notamment, il peut être mis en œuvre pour un système de moteur de traction.  An electric machine, and for example a variable reluctance motor or permanent magnet, as just described can be implemented in many applications in a motor vehicle. In particular, it can be implemented for a traction motor system.
Selon une application particulièrement intéressante cependant, la machine électrique, et par exemple le moteur à reluctance variable ou aimants permanents tel qu'il vient d'être décrit peut être mis en œuvre dans un compresseur électrique de suralimentation pour véhicule automobile, comportant une roue de compression entraînée en rotation par la rotation du rotor du moteur.  According to a particularly interesting application however, the electric machine, and for example the variable reluctance motor or permanent magnets as just described can be implemented in an electric supercharger for a motor vehicle, comprising a wheel of compression driven in rotation by the rotation of the motor rotor.
L'invention ne se limite pas au seul exemple de réalisation décrit ci- avant en regard des figures, à titre d'exemple illustratif et non limitatif.  The invention is not limited to the single embodiment described above with reference to the figures, by way of illustrative and non-limiting example.
Notamment, le stator 14 peut être reçu dans un boîtier de la machine en laissant des espaces vides (ou jeux) entre le stator 14 et le boîtier, les espaces vides s'étendant essentiellement selon une direction longitudinale de la machine électrique. Le stator et le boîtier de la machine définissent alors de préférence des zones de contact linéiques. Ces espaces vides entre le stator et le boîtier de la machine permettent de limiter le bruit rayonné par la machine. In particular, the stator 14 can be received in a housing of the machine leaving empty spaces (or gaps) between the stator 14 and the housing, the empty spaces extending substantially in a longitudinal direction of the electric machine. The stator and the housing of the machine then preferably define linear contact areas. These empty spaces between the stator and the housing of the machine can limit the noise radiated by the machine.
Par exemple, le stator 14 peut présenter une section transversale de forme générale polygonale, présentant le cas échéant une ou plusieurs découpes formées par la ou les cavités 28 débouchant sur la surface radialement externe du stator 14 et, de préférence, des angles arrondis destinés à être en contact avec le boîtier de la machine, lequel boîtier de la machine est de préférence de forme générale circulaire, en section transversale.  For example, the stator 14 may have a cross section of generally polygonal shape, possibly having one or more cuts formed by the cavity or cavities 28 opening on the radially outer surface of the stator 14 and, preferably, rounded corners intended for in contact with the housing of the machine, which housing of the machine is preferably generally circular in cross section.
Par ailleurs, ici, le stator a une section transversale à symétrie de révolution.  Moreover, here, the stator has a cross section with symmetry of revolution.
Cependant, le stator 14 peut présenter une section transversale pouvant être divisée en des secteurs angulaires de même angle au centre et incluant une unique dent radiale, au moins un desdits secteurs angulaires étant différent d'au moins un des autres dits secteurs angulaires, de préférence chaque secteurs angulaire étant différent des autres secteurs angulaires. Ceci permet également de déplacer vers les fréquences plus élevées, les émissions de bruit de la machine électrique, et par exemple du moteur à reluctance variable ou aimants permanents 10, notamment dans un domaine de fréquences inaudibles pour au moins certains utilisateurs. Dans ce cas, le rotor peut alors avoir une section transversale à symétrie de révolution.  However, the stator 14 may have a cross-section that can be divided into angular sectors of same angle in the center and including a single radial tooth, at least one of said angular sectors being different from at least one of said other angular sectors, preferably each angular sector being different from the other angular sectors. This also makes it possible to move the noise emissions of the electrical machine, and for example of the variable-reluctance motor or permanent magnets, to the higher frequencies, especially in a frequency range that is inaudible to at least some users. In this case, the rotor may then have a cross-section with symmetry of revolution.
Selon une autre variante encore, le rotor 12 et le stator 14 présentent tous les deux une section transversale pouvant être divisée en des secteurs angulaires de même angle au centre et incluant une unique dent radiale, au moins un desdits secteurs angulaires de chacun du rotor et du stator, étant différente d'au moins un des autres dits secteurs angulaires du rotor, respectivement du stator. De préférence, chacun des secteurs angulaires du rotor et du stator sont différents des autres secteurs angulaires du rotor et du stator, respectivement.  According to yet another variant, the rotor 12 and the stator 14 both have a cross-section which can be divided into angular sectors of same angle at the center and including a single radial tooth, at least one of said angular sectors of each of the rotor and the stator, being different from at least one of said other angular sectors of the rotor, respectively of the stator. Preferably, each of the angular sectors of the rotor and the stator are different from the other angular sectors of the rotor and the stator, respectively.

Claims

REVENDICATIONS
1 . Machine électrique (10) pour application dans un véhicule automobile, notamment pour compresseur électrique de suralimentation pour véhicule automobile, comprenant un rotor (12) et un stator (14) munis de dents radiales (16 ; 18), au moins l'un parmi le rotor (12) et le stator (14) présentant une section transversale pouvant être divisée en des secteurs angulaires (S1 -S4) de même angle au centre et incluant une unique dent radiale (16i-164), dans lequel chacun desdits secteurs angulaires (S1 -S4) est différents des autres dits secteurs angulaires (S1 -S4). 1. Electric machine (10) for application in a motor vehicle, in particular for an electric supercharger for a motor vehicle, comprising a rotor (12) and a stator (14) provided with radial teeth (16; 18), at least one of the rotor (12) and the stator (14) having a cross-section which can be divided into angular sectors (S1-S4) of the same central angle and including a single radial tooth (16 -16 4 ), wherein each of said sectors angular (S1-S4) is different from the other said angular sectors (S1-S4).
2. Machine électrique (10) selon la revendication 1 , dans lequel le stator (14) a une section transversale à symétrie de révolution. An electric machine (10) according to claim 1, wherein the stator (14) has a rotationally symmetrical cross-section.
3. Machine électrique (10) selon la revendication 1 , dans lequel le rotor (12) a une section transversale à symétrie de révolution. Electric machine (10) according to claim 1, wherein the rotor (12) has a rotationally symmetrical cross-section.
4. Machine électrique (10) selon la revendication 1 , dans lequel le rotor (12) et le stator (14) présentent une section transversale pouvant être divisée en des secteurs angulaires (S1 -S4) de même angle au centre et incluant une unique dent radiale (16i-164 ; 18), au moins un desdits secteurs angulaires (S1 -S4) de chacun du rotor (12) et du stator (14), étant différente d'au moins un des autres dits secteurs angulaires (S1 -S4) du rotor (12), respectivement du stator (14). An electrical machine (10) according to claim 1, wherein the rotor (12) and the stator (14) have a cross-section which can be divided into angular sectors (S1-S4) of the same central angle and including a single radial tooth (16i-16 4; 18), at least one of said angular sectors (S1 -S4) of each rotor (12) and the stator (14) being different from at least one other of said angular sectors (S1 -S4) of the rotor (12), respectively of the stator (14).
5. Machine électrique (10) selon l'une quelconque des revendications précédentes, dans lequel deux dents (16i-164) successives d'au moins l'un parmi le rotor (12) et le stator (14), sont reliée, en coupe transversale, par : Electric machine (10) according to any one of the preceding claims, wherein two successive teeth (16i-16 4 ) of at least one of the rotor (12) and the stator (14) are connected, in cross section, by:
- un arc de cercle ouvert radialement vers l'extérieur,  - a circular arc open radially outwards,
- un arc ce cercle ouvert radialement vers l'intérieur, - un tronçon de droite, les angles entre le tronçon de droite et le profil des dents successives étant de préférence arrondi. - an arc this circle open radially inwards, - A straight section, the angles between the right section and the profile of the successive teeth being preferably rounded.
6. Machine électrique (10) selon l'une quelconque des revendications précédentes, dans lequel le centre de gravité du rotor (12) est situé sur son axe de rotation. Electric machine (10) according to any of the preceding claims, wherein the center of gravity of the rotor (12) is located on its axis of rotation.
7. Machine électrique (10) selon l'une quelconque des revendications précédentes, dans lequel au moins l'une des dents (16i-164) de l'un au moins parmi le rotor (12) et le stator (14) est différentes des autres dents (16i-164) du même parmi le rotor (12) et le stator (14). Electric machine (10) according to any of the preceding claims, wherein at least one of the teeth (16i-16 4 ) of at least one of the rotor (12) and the stator (14) is different from the other teeth (16i-16 4 ) of the same among the rotor (12) and the stator (14).
8. Machine électrique (10) selon la revendication 8, dans lequel la dent (16i-164) est plus large que les autres dents (16i-164). An electric machine (10) according to claim 8, wherein the tooth (16i-16 4 ) is wider than the other teeth (16i-16 4 ).
9. Compresseur électrique de suralimentation pour véhicule automobile, comportant une roue de compression et une machine électrique (10) selon l'une quelconque des revendications 1 à 8, pour entraîner la roue de compression en rotation. An electric supercharger for a motor vehicle, comprising a compression wheel and an electric machine (10) according to any one of claims 1 to 8, for driving the compression wheel in rotation.
EP15805592.1A 2014-11-20 2015-11-18 Electric machine with an asymmetric rotor for use in a motor vehicle Withdrawn EP3221949A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1461265A FR3029027B1 (en) 2014-11-20 2014-11-20 ASYMMETRIC ROTOR ELECTRIC MACHINE FOR APPLICATION IN A MOTOR VEHICLE
PCT/FR2015/053118 WO2016079427A2 (en) 2014-11-20 2015-11-18 Electric machine with an asymmetric rotor for use in a motor vehicle

Publications (1)

Publication Number Publication Date
EP3221949A2 true EP3221949A2 (en) 2017-09-27

Family

ID=52589523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15805592.1A Withdrawn EP3221949A2 (en) 2014-11-20 2015-11-18 Electric machine with an asymmetric rotor for use in a motor vehicle

Country Status (3)

Country Link
EP (1) EP3221949A2 (en)
FR (1) FR3029027B1 (en)
WO (1) WO2016079427A2 (en)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6028385A (en) * 1995-10-19 2000-02-22 Tridelta Industries, Inc. Switched reluctance motor
DE19938624C2 (en) * 1999-08-14 2001-06-07 Daimler Chrysler Ag Exhaust gas turbocharger
DE19943951A1 (en) * 1999-09-14 2001-03-22 Bosch Gmbh Robert Rotor for electrical machines especially switched reluctance machines, comprises number of fixing elements which correspond to at least half of number of rotor poles
US6720686B1 (en) * 2000-10-03 2004-04-13 Emerson Electric Co. Reduced noise dynamoelectric machine
FR2991725B1 (en) 2012-06-11 2017-12-15 Valeo Systemes De Controle Moteur ASSEMBLY COMPRISING A THERMAL MOTOR AND AN ELECTRIC COMPRESSOR

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2016079427A2 *

Also Published As

Publication number Publication date
WO2016079427A2 (en) 2016-05-26
WO2016079427A3 (en) 2016-08-18
FR3029027B1 (en) 2018-01-19
FR3029027A1 (en) 2016-05-27

Similar Documents

Publication Publication Date Title
EP3221947A1 (en) Electric machine with stator having cavities, for use in an automotive vehicle
FR2959362A1 (en) ROTOR OF ROTATING ELECTRIC MACHINE WITH INTERPOLAR STRUCTURES
EP2936653B1 (en) Lundell rotor comprising claws with a reduced cross-section and alternator for a vehicle comprising such a rotor
EP2283561B1 (en) Rotor for rotary electric machine with reduced-mass interpolar structures
WO2016079427A2 (en) Electric machine with an asymmetric rotor for use in a motor vehicle
EP3223393B1 (en) Rotating electrical machine with a ratio of dimensions minimising torque ripple
WO2016079448A2 (en) Electric machine having helical teeth for use in a motor vehicle
FR2945683A1 (en) VERNIER MACHINE WITH INSIDE MAGNETS.
WO2016079446A1 (en) Electrical machine
WO2016146908A1 (en) Rotor of an electrical rotating machine with permanent magnets
WO2016062953A1 (en) Electric machine designed to limit sound nuisance
FR2899736A1 (en) ROTOR OF ROTATING ELECTRIC MACHINE COMPRISING MAGNET GORGES
EP3607640A1 (en) Rotor for electrical machine having internal permanent magnets
WO2018042124A1 (en) Rotor for a rotary electric machine provided with at least one deformable portion for filling a cavity
EP3005538A1 (en) Synchronous electric motor with permanent magnets
FR3086118A1 (en) ROTATING ELECTRIC MACHINE WITH REDUCED MASS ROTOR
WO2022194740A1 (en) Rotor for a rotary electric machine
FR3055484A1 (en) ROTOR OF ROTATING ELECTRIC MACHINE WITH AT LEAST ONE CURVED PORTION OF RECEIVING A SPRING
WO2017055721A1 (en) Electric machine
WO2016146909A1 (en) Rotor of an electrical rotating machine with an optimised configuration of permanent magnets
EP3464950A1 (en) Starter motor fitted with a pinion having at least one profiled tooth
WO2022175614A1 (en) Rotor for a rotary electric machine
FR3030925A1 (en) ELECTRIC MACHINE
FR3055483A1 (en) ROTOR OF ROTATING ELECTRIC MACHINE WITH AT LEAST ONE DEFORMABLE TAB FOR FILLING A PARASITE AIR BLADE
FR3086119A1 (en) ROTATING ELECTRIC MACHINE WITH REDUCED INERTIA ROTOR

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20170518

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20191213

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20200624