• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to an electric machine comprising a rotor (10) and a stator (12) comprising a wall (32) opposite the rotor, said stator carrying a multiplicity of radial notches arranged circumferentially along said stator. According to the invention, the notches (36) comprise a low wall (38) at a distance (E) from the wall of the stator so as to form a multiplicity of closed notches.
    公开号:FR3036870A1
    申请号:FR1554835
    申请日:2015-05-28
    公开日:2016-12-02
    发明作者:Julien Boisson；Wissam Dib；Rinato Biglino；Davide Bettoni
    申请人:IFP Energies Nouvelles IFPEN；Mavel SRL；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a rotating electrical machine with a stator with closed notches and more particularly to a synchronous electric machine with variable reluctance assisted by permanent magnets.
    [0002] Generally, such an electric machine comprises a stator and a rotor arranged coaxially one inside the other. The rotor is formed of a rotor body with a stack of sheets placed on a rotor shaft. These sheets include housings for permanent magnets and perforations to create flux barriers for radially directing the magnetic flux of the magnets to the stator. This rotor is generally housed inside a stator which carries electrical windings for generating a magnetic field for rotating the rotor. As best described in EP 1 057 242, the stator is annular in shape and comprises a plurality of radial notches open towards the rotor and extending all the way around the stator.
    [0003] These notches are provided to receive armature coils which are introduced into the stator by the open face of the notches and are fixed thereto by any known means. In general, torque ripple is important in this type of synchronous machine with reluctance assisted permanent magnets. This can generate jolts and vibrations in the rotor causing discomfort of use of this machine. The present invention aims to remedy the disadvantages enumerated above by means of an electric machine with a closed slot stator which makes it possible to reduce the torque ripple and the acoustic noise. For this purpose, the present invention relates to an electric machine comprising a rotor and a stator having a wall facing the rotor, said stator bearing a multiplicity of radial notches arranged circumferentially along said stator, characterized in that the notches comprise a low wall distance from the wall of the stator so as to form a multiplicity of closed notches. The notches may extend axially along the stator. The notches may have an oblong section with a low wall away from the wall of the stator, a high wall and two faces connecting the walls. The notches may have a circular section. The rotor may include housings for magnetic flux generators and recesses forming flow barriers. The other features and advantages of the invention will now appear on reading the description which will follow, given solely by way of illustration and not limitation, and to which are appended: FIG. 1 which is a diagrammatic cross-sectional view of the electrical machine according to the invention, - Figure 2 which is a schematic cross-sectional view of the stator of the machine of Figure 1 with a local section along the closed line A, - Figure 3 which is a graph illustrating the evolution of the constant current torque as a function of the electric position of the rotor for an electric machine 25 of the prior art and for an electric machine according to the invention and - Figure 4 which is a graph with curves illustrating the torque instantaneous electric machine (in Nm) relative to the electrical position of the machine.
    [0004] As illustrated in Figure 1 a rotating electrical machine, here a synchronous machine with variable reluctance assisted permanent magnet, comprises a rotor 10 and a stator 12 nested one inside the other being coaxial.
    [0005] The rotor comprises, in a manner known per se, a shaft 14, preferably magnetic, on which is placed a stack of identical flat ferromagnetic plates 16, which are assembled to each other by any known means.
    [0006] The circular-shaped plates 16 comprise a central bore 18 through which the rotor shaft 14 passes and a plurality of axial recesses 20 which pass through the sheets from one side to the other. A first series of rectangular axial recesses 22, arranged radially one above the other and at a distance from each other, form housings for magnetic flux generators, here permanent magnets 24 in the form of a bar which is also rectangular length substantially equal to the length of the stack of sheets. The other series of recesses consists of perforations 26 of inclined radial direction, which leave these dwellings to arrive near the edge 15 of the sheets. As shown in FIG. 1, the inclined perforations are arranged symmetrically with respect to the housings 22 of the magnets. Thus, each time a geometric figure substantially V-shaped flattened bottom is formed with the flat bottom formed by the housing 22 and with the inclined arms of the V 20 formed by the perforations 26. It thus creates barriers of flow 28 formed by the perforations. The magnetic flux coming from the magnets can only then pass through the solid parts between the perforations.
    [0007] Referring additionally to FIG. 2, the stator 12 comprises an annular ring 30 with an inner wall 32 whose inner diameter is provided to receive the rotor 10 with a gap necessary to provide an air gap 34, and an outer wall 33 This ring comprises a multiplicity of bores 36, here of oblong section, which form closed notches for the armature windings. More precisely, these bores extend axially all along the stator by being arranged radially on the ring while being placed circumferentially at a distance from each other by a distance D.
    [0008] In the example described, these oblong holes have a lower wall 38 of semicircular shape which is located at a distance E from the inner wall 32 of the stator, a high wall 40 of shape also semicircular, here of dimension diametral greater than that of the lower wall, and away from the outer wall 33 of the stator, and two side faces 42 connecting the ends of the semicircular walls. Advantageously, the distance E is a minimum value of 0.35 mm and a maximum value between 0.5 mm and 1 mm.
    [0009] By this, a closed volume is created which forms a closed notch for receiving the armature winding. Thus, the wall 32 is a continuous wall and the air gap 34 is almost constant between the rotor and the stator and this over the entire circumference. In addition, since the outside of the rotor and the inside of the stator are smooth, this allows for reduced aerodynamic noise.
    [0010] Of course, and without departing from the scope of the invention, these bores may have a section other than an oblong section, such as a cylindrical section. In this case, the upper and lower walls of the notches are of the same diametrical dimension forming a closed line such as a circle or an oval.
    [0011] Referring now to FIG. 3 which is a graph with curves illustrating the torque of the electric machine (in Nm) with respect to the rotor electrical position (in °) for a constant current, for a machine of the prior art (dashed line) with open stator notches and for a machine according to the invention (strong line) with closed stator notches, it can be seen that the torque variations of the machine, mainly due to the effects of notches, are greatly reduced for a machine according to the invention compared to a machine of the prior art.
    [0012] FIG. 4 is a graph with curves illustrating the instantaneous torque of the electrical machine (in Nm) with respect to the machine's electrical position (in °) for a constant current and a constant deflower angle, for a machine with open slots of the stator (prior art) and for a machine according to the invention with closed notches of the stator. In this figure, it can be seen that the variations (or ripples) of the torque of the electric machine according to the invention are greatly reduced with respect to an electric machine according to the prior art.
    权利要求:
    Claims (5)
    [0001]
    CLAIMS1) Electrical machine comprising a rotor (10) and a stator (12) having an inner wall (32) facing the rotor, said stator carrying a multiplicity of radial notches arranged circumferentially along said stator, characterized in that the notches (36) comprise a low wall (38) at a distance (E) from the inner wall of the stator so as to form a multiplicity of closed notches.
    [0002]
    2) Electrical machine according to claim 1, characterized in that the notches extend axially along the stator.
    [0003]
    3) Electrical machine according to claim 1 or 2, characterized in that the notches has an oblong section with a bottom wall (38) at a distance (E) from the wall of the stator, a top wall (40) and two faces (42). ) connecting the walls.
    [0004]
    4) Electrical machine according to claim 1 or 2, characterized in that the notches has a circular section.
    [0005]
    5) Electrical machine according to claim 1, characterized in that the rotor (10) comprises housings for magnetic flux generators (24) and recesses (30) forming flow barriers (46).
    类似技术:
    公开号 | 公开日 | 专利标题
    EP3304706B1|2020-10-28|Rotating electric machine with a stator with closed notches and more particularly variable-reluctance synchronous electric machine assisted by permanent magnets
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    WO2018153783A1|2018-08-30|Rotating electric machine comprising a stator with sealed slots, and more particularly permanent magnet-assisted reluctant synchronous electric machine
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    WO2020200767A1|2020-10-08|Rotor for an electrical machine, having asymmetric poles and lateral magnets
    FR3050587A1|2017-10-27|ROTATING ELECTRIC MACHINE HAVING AN ELECTRICAL CONDUCTOR FOR CONNECTING WINDINGS
    FR3036869A1|2016-12-02|ROTATING ELECTRICAL MACHINE WITH A STATOR WITH ENCLOSURES WITH COOLING, ESPECIALLY AN ELECTRIC MOTOR.
    FR3104848A1|2021-06-18|Synchro-reluctant machine with variable air gap
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    同族专利:
    公开号 | 公开日
    EP3304706A1|2018-04-11|
    CN207732602U|2018-08-14|
    JP6783800B2|2020-11-11|
    EP3304706B1|2020-10-28|
    WO2016188764A1|2016-12-01|
    FR3036870B1|2020-05-01|
    JP2018516055A|2018-06-14|
    US20180159387A1|2018-06-07|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1670119A1|2004-12-08|2006-06-14|Samsung Electronics Co., Ltd.|Motor with Improved flux distribution|
    US20110175482A1|2010-01-20|2011-07-21|Savagian Peter J|Optimized stator tooth tip for a motor with axially inserted stator windings|
    FR2973179A1|2011-03-21|2012-09-28|Renault Sa|Synchronous reluctance electrical motor for electric traction car, has set of layers offset with respect to succession of teeth of stator so as to desynchronize pulses of cogging torque resulting from passage of magnets in front of teeth|
    WO2014027630A1|2012-08-16|2014-02-20|株式会社ミツバ|Rotor for use in magnet-assisted reluctance motor, and brushless motor|
    EP2887503A1|2012-08-16|2015-06-24|Mitsuba Corporation|Rotor for use in magnet-assisted reluctance motor, and brushless motor|
    US4160926A|1975-06-20|1979-07-10|The Epoxylite Corporation|Materials and impregnating compositions for insulating electric machines|
    JP2782044B2|1994-12-21|1998-07-30|セイコー精機株式会社|Spindle motor|
    WO2002031947A1|2000-10-12|2002-04-18|Matsushita Electric Industrial Co., Ltd.|Electric motor|
    KR100591338B1|2004-08-26|2006-06-19|엘지전자 주식회사|Permanent Magnet Assisted SynRM and its method for impressing flux|
    JP5745379B2|2011-10-04|2015-07-08|日立オートモティブシステムズ株式会社|Rotating electric machine and electric vehicle|FR3062253B1|2017-01-25|2020-06-12|IFP Energies Nouvelles|CLOSED ROTATING ELECTRIC MACHINE WITH AN AIR COOLING SYSTEM OF THE MAGNETS IN THE ROTOR|
    FR3063398A1|2017-02-24|2018-08-31|IFP Energies Nouvelles|ROTATING ELECTRICAL MACHINE WITH A STATOR WITH ENCLOSED NOTCHES AND, MORE PARTICULARLY, RELUCTANT SYNCHRO ELECTRICAL MACHINE ASSISTED WITH PERMANENT MAGNETS|
    FR3066657B1|2017-05-16|2019-06-14|IFP Energies Nouvelles|ELECTRIC MACHINE COMPRISING A ROTOR ROTOR TREE AND METHOD OF MANUFACTURING SUCH A MACHINE|
    FR3071370B1|2017-09-18|2019-09-13|IFP Energies Nouvelles|ISTHMA OF MAGNETIC BRIDGES OF AN ELECTRIC MACHINE ROTOR|
    FR3071371B1|2017-09-18|2019-09-13|IFP Energies Nouvelles|GEOMETRY OF MAGNETIC BRIDGES OF AN ELECTRIC MACHINE ROTOR|
    FR3084534B1|2018-07-24|2020-07-17|IFP Energies Nouvelles|ROTOR OF ELECTRIC MACHINE WITH ASYMMETRIC MAGNETIC BRIDGES|
    FR3084535B1|2018-07-24|2020-07-17|IFP Energies Nouvelles|ELECTRIC MACHINE ROTOR WITH ASYMMETRIC POLES|
    FR3094583B1|2019-03-29|2021-03-12|Ifp Energies Now|Electric machine rotor with asymmetric poles and side magnets|
    EP3742583A1|2019-05-22|2020-11-25|Siemens Aktiengesellschaft|Quadrupole synchronous reluctance machine|
    WO2021095063A1|2019-11-12|2021-05-20|Mavel edt S.p.A.|Synchronous electric machine with reluctance assisted by permanent magnets and process for making such electric machine|
    FR3104848B1|2019-12-17|2021-11-26|Ifp Energies Now|Synchro-reluctant machine with variable air gap|
    法律状态:
    2016-05-18| PLFP| Fee payment|Year of fee payment: 2 |
    2016-12-02| PLSC| Publication of the preliminary search report|Effective date: 20161202 |
    2017-05-19| PLFP| Fee payment|Year of fee payment: 3 |
    2018-05-30| PLFP| Fee payment|Year of fee payment: 4 |
    2019-05-28| PLFP| Fee payment|Year of fee payment: 5 |
    2020-05-28| PLFP| Fee payment|Year of fee payment: 6 |
    2021-05-25| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1554835A|FR3036870B1|2015-05-28|2015-05-28|ROTATING ELECTRIC MACHINE WITH A STATOR WITH CLOSED NOTCHES AND MORE PARTICULARLY SYNCHRONOUS ELECTRIC MACHINE WITH VARIABLE RELUCTANCE ASSISTED WITH PERMANENT MAGNETS.|
    FR1554835|2015-05-28|FR1554835A| FR3036870B1|2015-05-28|2015-05-28|ROTATING ELECTRIC MACHINE WITH A STATOR WITH CLOSED NOTCHES AND MORE PARTICULARLY SYNCHRONOUS ELECTRIC MACHINE WITH VARIABLE RELUCTANCE ASSISTED WITH PERMANENT MAGNETS.|
    JP2017559033A| JP6783800B2|2015-05-28|2016-05-12|Rotating electromachines with stators with closed notches, especially variable reluctance synchronous electromachines assisted by permanent magnets|
    US15/577,689| US20180159387A1|2015-05-28|2016-05-12|Rotating electric machine with a stator closed notches and, more particularly variable-reluctance synchronous electric machine assisted by permanent magnets|
    PCT/EP2016/060697| WO2016188764A1|2015-05-28|2016-05-12|Rotating electric machine with a stator with closed notches and more particularly variable-reluctance synchronous electric machine assisted by permanent magnets|
    EP16722654.7A| EP3304706B1|2015-05-28|2016-05-12|Rotating electric machine with a stator with closed notches and more particularly variable-reluctance synchronous electric machine assisted by permanent magnets|
    CN201690000072.9U| CN207732602U|2015-05-28|2016-05-12|Electric rotating machine with the stator for being provided with closed slots|
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