• 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 a rotor (2) of electric motor (1) comprising a body (6) of substantially cylindrical shape, conducting a magnetic field, delimiting at least one housing (12) receiving a group of magnets (4) comprising at minus two permanent magnets (4). The two magnets (4) circumferentially adjacent to the housing (12) are separated from each other by an air gap (24).
    公开号:FR3032839A1
    申请号:FR1551282
    申请日:2015-02-16
    公开日:2016-08-19
    发明作者:Andry Randria；Bruno Raguin
    申请人:Alstom Transport Technologies SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to an electric motor rotor comprising a body of substantially cylindrical shape, conducting a magnetic field, delimiting at least one housing receiving a group of magnets comprising at least two permanent magnets. EP 2 264 860 discloses an electric motor rotor comprising a tubular laminated assembly and magnets "buried", that is to say not extending on the periphery of the rotor. Housings formed in this assembly each receive a group of permanent magnets, each group of permanent magnets forming a magnetic pole of the rotor. All the magnets of the same group are covered on each of their faces with an electrical insulating material intended to isolate the magnets from each other and from the laminated assembly. Such a rotor does not give complete satisfaction. Indeed, the addition of an insulating material surrounding the magnets individually on each of their faces increases the manufacturing cost of the rotor and complicates the assembly process. An object of the invention is to provide an electric motor rotor having satisfactory magnetic properties while being able to be assembled simply and quickly. To this end, the invention relates to an electric motor rotor as mentioned above, wherein the two circumferentially adjacent magnets of the housing are separated from each other by an air gap. The invention makes it possible to avoid the addition of an insulating material on each of the faces of the permanent magnets, which simplifies the method of assembling the rotor, and to implement a rotor which is less expensive than a rotor with blocks of magnetic elements glued and isolated from each other. The rotor according to the invention may comprise one or more of the following characteristics, taken in isolation or in any technically possible combination: the air gap has a thickness greater than or equal to 0.01 mm; the housing delimits notches for receiving the permanent magnets, each magnet being inserted into a respective notch by one of its longitudinal ends, and the notches being configured so that two magnets circumferentially adjacent to one and the same housing are separated; one from the other by the air gap when their ends are engaged in their respective notches; - Two circumferentially adjacent magnets, respectively inserted into a slot of the housing, are offset radially; 3032839 2 - the adjustment between the notch and the magnet is at least one sliding adjustment so as to allow a hand positioning of the magnet in its notches, immobilization of the magnet in its notches, and disassembly of the magnet from its notches without damaging the magnet; The magnet has a single elementary block shape having a chamfer on each of its edges; - The periphery of the body is formed by a metal matrix of said body, the housing extending at a distance from said periphery; the main axis of the housing forms a non-zero angle with a radial direction of the body; two circumferentially and symmetrically adjacent housings in the radial direction of the body, form a V-shaped magnetic pole or a substantially plane magnetic pole; - several poles symmetrically distributed in rotation symmetry; The body comprises a substantially planar face extending at the periphery of said body between two circumferentially adjacent poles; - It comprises a stack of bodies forming a laminated assembly. The invention also relates to an electric motor comprising a rotor as defined above.
    [0002] The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the appended drawings, in which: FIG. 1 is a radial sectional view of a rotor in conformity with to the invention; - Figure 2 is a detail sectional view of a pole of the rotor of Figure 1; and FIG. 3 is a simplified view in radial section of a rotor according to a second embodiment of the invention. In all that follows, the term "axial" direction means the direction extending along the axis of rotation of a motor 1 and the term "radial" direction means a direction perpendicular to that direction. rotation axis. As shown in Figure 1, an electric motor 1 comprises a stator 30 secured to a housing (not shown) and a rotor 2 secured to a shaft and rotatable about an axis relative to the stator. The rotor 2 comprises a hub (not shown) secured in rotation by means of drive means not shown on the shaft, a laminar assembly of tubular shape, substantially cylindrical, extending along the axis of rotation, surrounding the hub 35 and fitted tight at the periphery of the hub at each of its axial ends, and 3 magnetic elements 4, for example, permanent magnets, distributed on the inner periphery of the laminated assembly. The magnetic elements 4 are permanent magnets, each being in the form of a single elementary block, for example, substantially parallelepipedal 5 and having a chamfer on each of its edges, to facilitate its insertion into the laminated assembly, as will be described later. Permanent magnets 4 are made, for example, samarium cobalt (SmCo) or neodymium iron boron (NdFeB). For a permanent magnet 4 neodymium boron iron, the outer surface of the permanent magnet 4 advantageously comprises a surface coating protecting it from corrosion. The laminated assembly is formed by a body stack 6 in the form of machined or cut metal sheet, magnetic field conductors, the laminated assembly being covered on its outer radial surfaces, by a magnetic insulating plate (not shown) intended to maintain the permanent magnets 4 housed inside the stack. That is to say that the metal sheets located at the axial ends of the stack are covered by an insulating plate, formed for example by a sheet of insulating material. The magnetic insulating plate is able to block the axial displacement of the permanent magnets 4. The magnetic insulating plate is able to avoid short circuits of magnetic flux. The insulating plate comprises a non-ferromagnetic plate, advantageously made of aluminum alloy. The insulating plate is screwed onto the hub. The bodies 6 are stacked along the axis of rotation to form the laminated assembly. The bodies 6 are formed by a metal matrix.
    [0003] Each body 6 extends along the axis of rotation of the rotor 2. The body 6 is substantially cylindrical in shape and has an annular shape. The body 6 comprises a first and a second plane main surface 8 extending in a radial plane, that is to say substantially perpendicular to the rotor axis 2, and a peripheral surface 10 connecting the first and second surfaces. 8 at the outer radial ends of the main surfaces 8 and extending in the axial direction. As illustrated in FIG. 1, the laminated assembly delimits housings 12 crossing the assembly along an axis extending in the axial direction, forming magnetic poles 14, each pole being formed by a pair of housings 12. According to FIG. the embodiment shown in the figures, the laminated assembly comprises for example twelve housings 12 forming six magnetic poles 14.
    [0004] The peripheral surface 10 of the body comprises faces 16, each face 16 extending between two adjacent poles 14 circumferentially. The faces 16, for example substantially planar, are interconnected by curved sections having an arcuate section of radius equal to the radius of the assembly, each curved section extending opposite two adjacent housing 12. The peripheral surface 10 and the faces 16 define the shape of the magnetic flux generated. Each housing 12 of the body is intended to receive a plurality of permanent magnets 4 having the same polarity. Each housing 12 is substantially an oblong hole through the rotor 2 and 10 opening axially into the main external surfaces of the laminated assembly. The housings 12 are remote from the peripheral surface 10 of the body. The housing 12 extends, in section, that is to say in a radial plane, along a main axis D, between a first end 18 close to the peripheral surface 10 and a second end 20 extending at a distance from the peripheral surface 10 and closer to the axis of rotation. The main axis D of the housing 12 is substantially perpendicular to the axial direction and forms a non-zero angle O with a radial axis D passing between this housing and an adjacent housing, as shown in Figure 2. Two housing 12 adjacent circumferentially and substantially symmetrical to each other with respect to the radial axis D passing between these two housings 12 form a pole 14. These two housings 12 thus form a V. According to the embodiment shown in the figures, six poles 14 are distributed symmetrically on the main surface 8 of the body. The housings 12 of each pole 14 have permanent magnets 4 of the same polarity. Two circumferentially adjacent poles 14 successively present an alternation of polarity of the permanent magnets 4. In a variant, as illustrated by FIG. 3, the housing 12 extends along a principal axis E, substantially perpendicular to a radial axis passing through an axis of The first end 18 of the housing has, for example, substantially the outline of a semicircle having a radius extending along the main axis D of the housing 12. The second end 20 of the housing has the outline of a degauchi semi-circle. The second end 20 has a contour arranged to advantageously distribute, homogeneously, the internal stresses associated with the removal of material from the housing 12.
    [0005] The housing 12 further has an arrangement of notches 22 and intermediate zones 23 so that two successive notches 22 along the main axis D of the housing 12 are separated by an intermediate zone 23, and that notch 22, in a direction perpendicular to the main direction and axial of the housing 12, or in front of an intermediate zone 23 in the same housing 12. The notches 22 are intended to receive a longitudinal end of the permanent magnet 4 of so that two circumferentially adjacent magnets 4 of the housing 12 are separated from each other by an air knife 24. The notches 22 extend parallel to the axis of rotation of the rotor 2 and form an end portion of the housing 12 along an axis perpendicular to the main axis D of the housing 12 and to the axial direction. Two notches 22 adjacent and / or facing in the direction perpendicular to the main axis D of the housing 12, are offset circumferentially. The notch 22 is substantially dovetail-shaped containing to facilitate the insertion of the permanent magnets 4. As illustrated in Figure 2, the notch 22 has a bottom 26 plane extending longitudinally along the axis of rotation rotor 2 and 15 transversely along the main axis D of the housing 12, connected to the intermediate zone 23 by two panels extending along an axis substantially perpendicular to the main axis D. The notch 22 also has a clearance of angle 28 at the intersection between the bottom 26 and the panels connecting to the intermediate zone 23. The bottom 26 has a width, along the main axis D, greater than the width 20 of the permanent magnet 4. The difference between the width of the bottom 26 and that of the permanent magnet 4 is about 0.1 mm. The intermediate zone 23 forms the other end portion of the housing 12 along an axis perpendicular to the main axis D of the housing 12 and in the axial direction and has the two faces, and an intermediate section 29 extending between two successive notches 22 25 along the main axis D of the housing 12. The intermediate section 29 has a width greater than the width of the bottom 26, suitable for forming the air gap insulation. The difference between the width of the intermediate section 29 and that of the bottom 26 is about 0.1 mm. The intersection between the two faces and the intermediate section 29 is advantageously 30 rounded. Each notch 22 and each intermediate zone 23 thus have a shape adapted to separate each permanent magnet 4 from another permanent magnet 4 circumferentially adjacent, so as to provide insulation by the air gap 24 between each circumferentially adjacent permanent magnet 4, that is, the adjacent permanent magnets are not in contact with each other.
    [0006] The notches 22 are configured such that two circumferentially adjacent magnets 4 in the same housing 12 are separated from each other by the air knife 24 when the ends of the permanent magnets 4 are engaged in the notches 22. respectively.
    [0007] The air gap 24 extends in a plane substantially perpendicular to the main axis D of the housing 12. The air gap 24 thus extends between lateral faces of two circumferentially adjacent permanent magnets 4. The air gap 24 advantageously has a thickness greater than 0.01 mm, for example equal to 0.1 mm.
    [0008] In addition, the notch 22 has a shape adapted to minimize contact between the permanent magnet 4 and the body 6 of the rotor. The adjustment of the permanent magnet 4 between the faces of the bottom 26 and the intermediate panel 29, is a sliding adjustment, so as to allow a hand placement, immobilization and disassembly of the magnet 4 of its notch 22, without deterioration of the magnet 4. The presence of chamfer on the edges of the magnet facilitates this setting up as described above. The permanent magnets 4 are thus slidably mounted in the notches 22 of the housing, they are individually removable notches 22 of the housing. The permanent magnets 4 may move under the effect of vibrations and / or variations in speed and magnetic field but can not come into contact. The permanent magnets 4 are free to move according to a game defined by the adjustment between the magnet 4 and the housing 12 of the body. This adjustment, defined between the housing 12 and the permanent magnets 4, prevents any contact between two adjacent magnets 4 circumferentially.
    [0009] Such a rotor 2 makes it possible, thanks to the air strips 24 separating the magnets 4, to avoid the addition of an insulating material to ensure that the permanent magnets 4 are isolated from each other. Such a rotor 2 has the advantage of being able to use permanent magnets 4 inserted in the slots 22 less expensive than blocks of magnetic elements glued and isolated from each other.
    [0010] Such a rotor 2 has the advantage of being able to facilitate the placement of permanent magnets 4 in the housing 12 called "buried" compared to a housing called "surface". The rotor 2 has the advantage of preventing the permanent magnets 4 from touching each other thanks to the shape of the notches 22 of the body. If the contact occurs between two circumferentially adjacent magnets 4 or between permanent magnets 4 with the body 6, the body 6 is localized and punctual. As a result, the increase in losses in the magnets remains very low and the efficiency of the motor remains very high.
    权利要求:
    Claims (13)
    [0001]
    Electric motor rotor (2) (1) comprising a body (6) of substantially cylindrical shape, conducting a magnetic field, delimiting at least one housing (12) receiving a group of magnets (4) comprising at least two permanent magnets (4), characterized in that the two magnets (4) circumferentially adjacent to the housing (12) are separated from each other by an air gap (24).
    [0002]
    2. Rotor (2) according to claim 1, wherein the air gap (24) has a thickness greater than or equal to 0.01 mm.
    [0003]
    3. Rotor (2) according to claim 1 or 2, wherein the housing (12) defines notches (22) for receiving permanent magnets (4), each magnet (4) being inserted into a respective notch (22). at one of its longitudinal ends, and the notches (22) being configured so that two circumferentially adjacent magnets (4) of the same housing (12) are separated from each other by the blade of air (24) when their ends are engaged (22) in their respective notches (22).
    [0004]
    4. Rotor (2) according to claim 3, wherein two circumferentially adjacent magnets (4), respectively inserted into a notch (2) of the housing (12), are offset radially.
    [0005]
    5. Rotor (2) according to claim 3 or 4, wherein the adjustment between the notch (22) and the magnet (4) is at least one sliding fit so as to allow a hand placement the magnet (4) in its notches (22), immobilizing the magnet (4) in its notches (22), and disassembling the magnet (4) from its notches (22) without damaging the magnet (4). magnet (4).
    [0006]
    6. Rotor (2) according to claim 5, wherein the magnet (4) has a single elementary block shape having a chamfer on each of its edges. 3032839 9
    [0007]
    7. Rotor (2) according to any one of claims 1 to 6, wherein the periphery (10) of the body (6) is formed by a metal matrix of said body (6), the housing (12) extending away from said periphery (10). 5
    [0008]
    8. Rotor (2) according to any one of claims 1 to 7, wherein the main axis of the housing (12) forms a non-zero angle with a radial direction of the body (6).
    [0009]
    9. Rotor (2) according to any one of claims 1 to 8, wherein two housings (12) circumferentially adjacent and symmetrical in the radial direction 10 of the body (6), form a pole (14) magnetic shaped V or a substantially planar magnetic pole (14).
    [0010]
    10. Rotor (2) according to claim 9, wherein the body (6) comprises a plurality of poles (14) symmetrically distributed in rotation symmetry. 15
    [0011]
    11. Rotor (2) according to claim 9 or 10, wherein the body (6) comprises a substantially planar face (16) extending at the periphery (10) of said body (6) between two adjacent poles (14). circumferentially. 20
    [0012]
    12. Rotor (2) according to any one of claims 1 to 11, wherein it comprises a body stack (6) forming a laminated assembly.
    [0013]
    13. An electric motor (1) comprising a rotor (2) according to any one of the preceding claims.
    类似技术:
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    同族专利:
    公开号 | 公开日
    BR102016003073A2|2016-08-23|
    JP6799923B2|2020-12-16|
    FR3032839B1|2018-05-04|
    US20160241095A1|2016-08-18|
    CN105896769A|2016-08-24|
    JP2016152771A|2016-08-22|
    EP3057201A1|2016-08-17|
    US10270302B2|2019-04-23|
    CN105896769B|2020-08-18|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5838086A|1994-07-27|1998-11-17|Parvex|Synchronous motor with permanent magnets included in a rotor|
    EP1014542A2|1998-12-25|2000-06-28|Matsushita Electric Industrial Co., Ltd.|Motor having a rotor with interior split-permanent-magnet|
    DE102006011729A1|2006-03-14|2007-09-20|Siemens Ag|Rotor of a permanent magnet synchronous machine|
    US20130249342A1|2012-03-20|2013-09-26|Kollmorgen Corporation|Cantilevered Rotor Magnet Support|
    JP2000245085A|1998-12-25|2000-09-08|Matsushita Electric Ind Co Ltd|Motor|
    US6750580B2|2000-12-26|2004-06-15|Industrial Technology Research Institute|Permanent magnet rotor having magnet positioning and retaining means|
    ITBO20050437A1|2005-06-30|2007-01-01|Spal Automotive Srl|ROTOR FOR ELECTRIC MACHINE|
    JP4854001B2|2005-11-29|2012-01-11|三菱重工プラスチックテクノロジー株式会社|Motor for injection molding machine, rotor of embedded magnet type motor|
    JP4466681B2|2007-05-11|2010-05-26|トヨタ自動車株式会社|Rotating electric machine rotor and rotating electric machine|
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    JP5308832B2|2009-01-09|2013-10-09|株式会社日立製作所|Permanent magnet rotating electric machine|
    JP5268711B2|2009-03-02|2013-08-21|三菱電機株式会社|Electric motor and compressor, air conditioner and vacuum cleaner|
    US7843100B2|2009-03-18|2010-11-30|Gm Global Technology Operations, Inc.|Methods and apparatus for preventing demagnetization in interior permanent magnet machines|
    EP2264860B1|2009-06-18|2017-10-25|Bombardier Transportation GmbH|A rotor for a track-bound vehicle electric machine, such a machine and a track-bound vehicle having such a machine|
    GB0915872D0|2009-09-10|2009-10-14|Goodrich Control Sys|Rotor assembly|
    JP5490056B2|2011-05-17|2014-05-14|三菱電機株式会社|Embedded magnet rotating electric machine|
    JP5436525B2|2011-12-05|2014-03-05|三菱電機株式会社|Electric motor|
    US8796875B2|2012-11-20|2014-08-05|Turbogen, Llc|Housing apparatus for use with an electrical system and method of using same|CN107819365B|2016-09-13|2019-06-14|南京德朔实业有限公司|Rotor punching|
    JP6573654B2|2017-12-25|2019-09-11|本田技研工業株式会社|Rotating electrical machine rotor|
    DE102018210967A1|2018-07-04|2020-01-09|Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg|rotor|
    法律状态:
    2016-02-18| PLFP| Fee payment|Year of fee payment: 2 |
    2016-08-19| PLSC| Publication of the preliminary search report|Effective date: 20160819 |
    2017-02-17| PLFP| Fee payment|Year of fee payment: 3 |
    2018-02-02| CA| Change of address|Effective date: 20180103 |
    2018-02-23| PLFP| Fee payment|Year of fee payment: 4 |
    2020-02-19| PLFP| Fee payment|Year of fee payment: 6 |
    2021-02-24| PLFP| Fee payment|Year of fee payment: 7 |
    2022-02-16| PLFP| Fee payment|Year of fee payment: 8 |
    优先权:
    申请号 | 申请日 | 专利标题
    FR1551282|2015-02-16|
    FR1551282A|FR3032839B1|2015-02-16|2015-02-16|ELECTRIC MOTOR ROTOR AND CORRESPONDING ELECTRIC MOTOR|FR1551282A| FR3032839B1|2015-02-16|2015-02-16|ELECTRIC MOTOR ROTOR AND CORRESPONDING ELECTRIC MOTOR|
    EP16155035.5A| EP3057201A1|2015-02-16|2016-02-10|Electric motor rotor and electric motor associated|
    US15/043,250| US10270302B2|2015-02-16|2016-02-12|Electric motor rotor and electric motor associated|
    JP2016025649A| JP6799923B2|2015-02-16|2016-02-15|Electric motor rotor and related electric motor|
    BR102016003073A| BR102016003073A2|2015-02-16|2016-02-15|electric motor rotor and electric motor|
    CN201610087815.7A| CN105896769B|2015-02-16|2016-02-16|Motor rotor and related motor|
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