WO2021093103A1 - 一种永磁体固定结构 - Google Patents

一种永磁体固定结构 Download PDF

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Publication number
WO2021093103A1
WO2021093103A1 PCT/CN2019/127892 CN2019127892W WO2021093103A1 WO 2021093103 A1 WO2021093103 A1 WO 2021093103A1 CN 2019127892 W CN2019127892 W CN 2019127892W WO 2021093103 A1 WO2021093103 A1 WO 2021093103A1
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WO
WIPO (PCT)
Prior art keywords
permanent magnet
rotor core
magnetic isolation
fixing structure
magnet fixing
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PCT/CN2019/127892
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English (en)
French (fr)
Inventor
朱利湘
王冬梅
刘勇
李广
崔斯柳
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中车株洲电机有限公司
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Application filed by 中车株洲电机有限公司 filed Critical 中车株洲电机有限公司
Publication of WO2021093103A1 publication Critical patent/WO2021093103A1/zh

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    • 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
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • 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
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets

Definitions

  • This application belongs to the technical field of permanent magnet direct drive motors, and specifically relates to a permanent magnet fixing structure.
  • Permanent magnets are the source of magnetic force that generates the magnetic field.
  • the permanent magnets in the permanent magnet synchronous motor are all installed on the rotor to generate the rotor magnetic field.
  • the rotor magnetic field interacts with the stator magnetic field to transform electrical energy into mechanical energy or mechanical energy into electrical energy.
  • the rotor structure of the permanent magnet synchronous motor is generally divided into three types: surface type, built-in type and claw pole type.
  • Surface permanent magnets are permanent magnets installed on the surface of the rotor, including the inner and outer surfaces of the rotor.
  • the permanent magnet In the traditional surface permanent magnet structure, the permanent magnet is usually fixed to the surface of the rotor core with glue only.
  • the disadvantage of this method is that the glue is easy to fail and age under the condition of large vibration and heat. This causes the permanent magnet to shift or even fall off in the circumferential direction.
  • Magnetic barrier strips are usually installed between adjacent permanent magnets to compress or fix permanent magnets. They are made of non-magnetic materials to prevent adjacent permanent magnets with different polarities from causing large magnetic flux leakage here. In this way, the magnetic barrier strip itself is fixed on the surface of the rotor core in two ways:
  • the first dovetail groove is arranged on the inner surface of the rotor core in the axial direction.
  • the cross section of the magnetic isolation bead is in the shape of a double dovetail.
  • the first dovetail of the magnetic isolation bead is clamped into the first dovetail groove in the rotor core.
  • the second dovetail adjacent to the magnetic bead forms another dovetail groove, and the permanent magnet is clamped into the dovetail groove.
  • This application mainly solves the technical problems existing in the above-mentioned prior art and provides a permanent magnet fixing structure.
  • a permanent magnet fixing structure including a rotor core, a permanent magnet and a magnetic barrier strip
  • the magnetic isolation bead includes a bar body, indenters located on both sides of the bar body, and a number of connecting pieces.
  • the magnetic isolation bead penetrates the rotor core in the radial direction, and the indenter and the connecting members are respectively located at Both sides of the rotor core;
  • the permanent magnets are installed on the inner surface or the outer surface of the rotor core through the adjacent pressure heads.
  • the outer surface or the inner surface of the rotor core is provided with a mounting counterbore at a corresponding position to accommodate the The connecting piece and the fasteners matched with it; the connecting piece is threadedly connected with the fastener; the width of the bar in the magnetic isolation strip is smaller than the diameter of the thread or the threaded hole on the connecting piece;
  • the gaps between the permanent magnets, the magnetic isolation bar and the rotor core are all filled with glue and sealed.
  • the connecting member is a screw
  • the fastener is a nut matching the screw
  • the connecting piece is a cylinder with a threaded hole
  • the fastener is a screw matching the threaded hole
  • the connecting members on the adjacent magnetic isolation bead are staggered.
  • the number of the connecting members on the adjacent magnetic isolation bead is different.
  • a retaining ring is provided on both sides of the permanent magnet in the axial direction.
  • the cross section of the bead is a dovetail shape, and the side surface of the permanent magnet connected with the bead matches the shape of the bead.
  • the magnetic isolation bead includes a bar body, indenters located on both sides of the bar body, and a number of connecting pieces.
  • the magnetic isolation bead penetrates the rotor core in the radial direction and is The indenter and the connecting member are respectively located on both sides of the rotor core; the permanent magnets are installed on the inner or outer surface of the rotor core through the adjacent indenters, and correspondingly, the rotor core
  • the outer surface or the inner surface of the corresponding position is provided with a mounting counterbore to accommodate the connecting piece and the fasteners matched with it; the connecting piece is threadedly connected with the fastener; the magnetic isolation strip
  • the width of the bar body is smaller than the diameter of the thread or the threaded hole on the connecting piece, so that under the condition that the space between adjacent permanent magnets is small in the circumferential direction, a larger size screw or nut can be used to fix the permanent magnet,
  • a threaded fastening structure that achieves a large fast
  • the above-mentioned permanent magnet fixing structure solves the problem of reliable fixing of permanent magnets on the surface of the rotor in a motor with a large number of poles in a small space.
  • the connecting members on the adjacent magnetic shielding strips are staggered, and correspondingly, the adjacent rows of mounting counterbores arranged on the inner or outer surface of the rotor core are along the rotor
  • the axial direction of the iron core is also staggered, thereby reducing the magnitude of the decrease in the strength of the rotor core by the opening.
  • FIG. 1 is a cross-sectional view of the permanent magnet fixing structure in the first specific embodiment of the present invention
  • Fig. 2 is a three-dimensional structural diagram of the left magnetic isolation bead in Fig. 1;
  • Fig. 3 is a three-dimensional structure diagram of the right magnetic isolation bead in Fig. 2;
  • Fig. 4 is a three-dimensional view of the permanent magnet fixing structure in Fig. 1;
  • FIG. 5 is a cross-sectional view of the permanent magnet fixing structure in the second specific embodiment of the present invention.
  • Fig. 6 is a three-dimensional structural view of the left magnetic isolation bead in Fig. 5;
  • Fig. 7 is a three-dimensional structural view of the right magnetic isolation bead in Fig. 5;
  • Fig. 8 is a three-dimensional view of the permanent magnet fixing structure in Fig. 5.
  • a permanent magnet fixing structure comprising a rotor core 1, a permanent magnet 4 and a magnetic isolation pressure strip; the permanent magnet 4 is installed on the inner or outer surface of the rotor core 1 through two adjacent said magnetic isolation pressure strips, that is, the invention is applicable to For the inner rotor permanent magnet direct drive motor, it is also suitable for the outer rotor permanent magnet direct drive motor.
  • the corresponding drawings of the present invention are the arrangement of the permanent magnet fixed structure in the outer rotor motor.
  • both the permanent magnet 4 and the magnetic isolation bar can be made into multiple sections, so that the total length of the permanent magnet 4 matches the rotor core.
  • a retaining ring 8 can be provided to position the permanent magnet 4 in the axial direction, and it is usually arranged at both ends of the permanent magnet 4 in the axial direction.
  • the magnetic isolation bead includes a bar body, indenters located on both sides of the bar body, and a number of connecting members.
  • the magnetic isolation bead penetrates the rotor core 1 in the radial direction, and the indenter and the indenter
  • the connecting pieces are respectively located on both sides of the rotor core 1; that is, the rotor core 1 is provided with a through hole for facilitating the passage of the magnetic isolation bar.
  • the cross section of the indenter is preferably a dovetail shape, of course, it can also be in other shapes, such as a T-shape.
  • the bar body can be set in a rectangular shape.
  • the permanent magnet 4 is installed on the inner surface or the outer surface of the rotor core 1 through the adjacent pressure heads, and correspondingly, the outer surface or the inner surface of the rotor core 1 is provided with a mounting counterbore to accommodate the connection Parts and the fasteners that match it.
  • the connecting piece is threadedly connected with the fastener, and the width of the bar body in the magnetic isolation bead is smaller than the diameter of the thread or the threaded hole on the connecting piece, so that the space between adjacent permanent magnets 4 is relatively large.
  • a screw 21 or a nut 2 of a larger size can be used to fix the permanent magnet 4, so as to achieve a threaded fastening structure with a larger fastening force.
  • the connecting members are usually evenly distributed on the strip body, and the number can be more than one.
  • the connecting member and the bar body may be welded.
  • the side surface of the permanent magnet 4 and the indenter matches the shape of the indenter, that is, the centripetal surface of the permanent magnet 4 in the permanent magnet fixing structure in the outer rotor motor has a chamfered structure, and the bead
  • the centripetal end of is correspondingly dovetail-shaped, so the distance between the dovetails of adjacent indenters after assembly is smaller than the width of the permanent magnet 4 to ensure that the permanent magnet 4 will not fall off centripetally.
  • the permanent magnet 4 and the indenter can be provided as a clearance fit to facilitate installation.
  • the gaps between the permanent magnet 4, the magnetic isolation bead and the rotor core 1 are all filled with glue, and the gap between the magnetic isolation bead and the permanent magnet 4 is filled to make it integrated and tight.
  • the solid force is further enhanced and a protective film is formed on the outer surface of the permanent magnet 4, which is beneficial to the anti-corrosion performance of the permanent magnet 4.
  • the above-mentioned permanent magnet fixing structure solves the problem of reliable fixing of permanent magnets on the surface of the rotor in a motor with a large number of poles in a small space.
  • the connecting member is a screw
  • the fastener is a nut 2 that can be matched with the screw
  • a washer 3 may be provided at the connection between the screw and the nut 2.
  • the screw rod passes through the through hole on the rotor core 1, a washer 3 and a nut 2 are sheathed at the counterbore of the rotor core 1, and the magnetic isolation bead is fastened by threads.
  • the washers that can be considered are flat washers GB97; spring washers GB93; disc springs GB1972; conical lock washers GB956.1.
  • the nut 2 can also be tightened with two nuts, such as the nut GB6170 plus the nut GB6174 thin type, or the nut GB6170 plus the fastening nut GB805; or directly using the locking nut GB6185.1.
  • the connecting member is a cylinder with a threaded hole
  • the fastener is a screw 21 that can be matched with the threaded hole
  • the connection between the threaded hole and the screw 21 is also A gasket 3 may be provided.
  • the cylinder When installing, the cylinder is inserted into the inner counterbore of the rotor core 1, and the screw 2 is fitted with the washer 3, then passes through the light hole in the rotor core 1, and is inserted into the threaded hole of the cylinder, and the bead is fastened by threads .
  • the outer surface of the rotor core 1 is provided with installation counterbore holes capable of accommodating the fasteners. After assembly, the outer surface of the fasteners is lower than the outer surface of the rotor core 1. surface. If it is an inner-rotor motor, then correspondingly, a counterbore that can accommodate the fasteners is provided on the inner surface of the rotor core 1.
  • the width of the bead is smaller than the diameter of the thread or the threaded hole on the connecting piece, a larger size can be adopted under the condition that the space between adjacent permanent magnets 4 in the circumferential direction is small. Screws or nuts of specifications are used to fix the permanent magnets to achieve a threaded fastening structure with greater fastening force.
  • the width of the lower bead is less than 4mm
  • the thread diameter of the upper threaded hole can be M6 and above to ensure that the thread has a certain mechanical strength.
  • the connecting piece on the magnetic isolation bar can be further provided:
  • the positions of the connecting members on the two adjacent magnetic barrier strips for fixing the same permanent magnet 4 are set to be different, preferably staggered.
  • the mounting counterbore provided on the inner surface or the outer surface of the rotor core 1
  • the distribution is staggered along the axial direction of the rotor core 1, as shown in Figs. 4 and 8 for details. In this way, it can help improve the mechanical strength of the rotor core and reduce the impact of the opening on the rotor core.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

一种永磁体固定结构，包括灌胶密封的转子铁心、永磁体和隔磁压条；所述隔磁压条包括条身和分别位于所述条身两侧的压头、若干连接件，所述隔磁压条在径向上贯穿所述转子铁心且所述压头和所述连接件分别位于所述转子铁心的两侧；所述永磁体通过相邻的所述压头安装于所述转子铁心的内表面或外表面，所述转子铁心的外表面或内表面对应位置设有容纳所述连接件以及所述紧固件的安装沉孔，所述连接件与所述紧固件螺纹相接；所述条身的宽度小于所述连接件上螺纹或者螺纹孔的直径。上述永磁体固定结构可在永磁体圆周方向之间空间尺寸较小的条件下，采用较大尺寸规格的螺钉或螺母来达到较大的紧固力。

Description

一种永磁体固定结构
本申请要求于2019年11月12日提交中国专利局、申请号为201911100968.0、申请名称为“一种永磁体固定结构”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请属于永磁直驱电机技术领域，具体是涉及一种永磁体固定结构。
背景技术
永磁体是产生磁场的磁力源，永磁同步电机里的永磁体均安装在转子上产生转子磁场，转子磁场与定子磁场的相互作用，从而达到电能转变为机械能或机械能转变为电能。按照永磁体在转子上位置的不同，永磁同步电机的转子结构一般分为三种：表面式、内置式和爪极式。表面式永磁体即永磁体安装在转子表面，包括转子的内表面和外表面。
传统的表面式永磁体结构中，永磁体的固定方式通常是仅用胶将永磁体粘接在转子铁心表面，这种方式的缺点是：在振动大和发热的情况下，胶易失效老化，从而导致永磁体沿圆周方向移位、甚至脱落。
现有技术中对上述永磁体的固定方式做了改进，常见的就是借助隔磁压条将永磁体固定在转子铁心的内表面或外表面。隔磁压条通常安装在相邻永磁体之间，用于压紧或固定永磁体，它由不导磁的材料制成，以免相邻不同极性的永磁体在此处产生较大漏磁。这种方式中，隔磁压条自身多通过两种方式固定在转子铁心表面：
一种是通过螺栓或螺钉固定，这种方法需采用M6以上规格的螺栓或螺钉(因为只有M6以上螺栓或螺钉才能有一定的紧固力)紧固隔磁压条，但在隔磁压条宽度小于6mm的情况下，不能采用此方法。
一种是卡接，比如在转子芯体内表面沿轴向布置第一燕尾槽，隔磁压条横截面为双燕尾形状，隔磁压条第一燕尾卡入转子芯体内的第一燕尾槽内，相邻隔磁压条的第二燕尾形成另一个燕尾槽，永磁体卡入该燕尾槽中。 但是该结构设计存在装配工艺要求和运用可靠性要求的相互矛盾：从装配工艺看，为方便隔磁压条的插进安装和永磁体的插进安装，要求这些零件之间的尺寸采用间隙配合；但运用在振动条件下，这些存在于零件之间的间隙，易使永磁体等零件松动而产生故障；因此若为确保运动中不松动的可靠性要求，这些零件之间的尺寸配合需采用过盈或压紧，而过盈配合将会导致插进安装困难，工艺无法实现。
申请内容
本申请主要是解决上述现有技术所存在的技术问题，提供一种永磁体固定结构。
本申请的上述技术问题主要是通过下述技术方案得以解决的：一种永磁体固定结构，包括转子铁心、永磁体和隔磁压条；
所述隔磁压条包括条身和分别位于所述条身两侧的压头、若干连接件，所述隔磁压条在径向上贯穿所述转子铁心且所述压头和所述连接件分别位于所述转子铁心的两侧；
所述永磁体通过相邻的所述压头安装于所述转子铁心的内表面或外表面，相应地，所述转子铁心的外表面或内表面对应位置设有安装沉孔，以容纳所述连接件以及与其配合的紧固件；所述连接件与所述紧固件螺纹相接；所述隔磁压条中所述条身的宽度小于所述连接件上螺纹或者螺纹孔的直径；
所述永磁体、所述隔磁压条与所述转子铁心之间的空隙均灌胶密封。
优选地，所述连接件为螺杆，所述紧固件为与所述螺杆相匹配的螺母。
优选地，所述连接件为具有螺纹孔的圆柱体，所述紧固件为与所述螺纹孔相匹配的螺钉。
优选地，相邻的所述隔磁压条上所述连接件交错分布。
优选地，相邻所述隔磁压条上所述连接件的数量不同。
优选地，所述永磁体的轴向两侧均设置有挡圈。
优选地，所述压条的截面为燕尾形，所述永磁体与所述压条相接的侧面与所述压条形状相匹配。
本发明所提供的永磁体固定结构，所述隔磁压条包括条身和分别位于所述条身两侧的压头、若干连接件，所述隔磁压条在径向上贯穿所述转子铁心且所述压头和所述连接件分别位于所述转子铁心的两侧；所述永磁体通过相邻的所述压头安装于所述转子铁心的内表面或外表面，相应地，所述转子铁心的外表面或内表面对应位置设有安装沉孔，以容纳所述连接件以及与其配合的紧固件；所述连接件与所述紧固件螺纹相接；所述隔磁压条中所述条身的宽度小于所述连接件上螺纹或者螺纹孔的直径，从而在相邻永磁体圆周方向之间空间尺寸较小的条件下，能采用较大尺寸规格的螺钉或螺母来固定永磁体，达到较大紧固力的螺纹紧固结构；然后，通过密封灌胶，将隔磁压条与永磁体之间的空隙填满，使其成为一体，紧固力进一步增强且在永磁体外表面产生一层保护膜，有利于永磁体的防腐性能。
上述永磁体固定结构解决了甚多极数电机在小尺寸空间条件下，转子表面永磁体可靠固定的问题。
在一种具体实施方式中，相邻所述隔磁压条上所述连接件交错分布，相应的，设置于所述转子铁心内表面或外表面上的相邻排的安装沉孔沿所述转子铁心的轴向也错开分布，从而减小了开孔对转子铁心强度降低的幅值。
附图说明
图1为本发明第一种具体实施方式中永磁体固定结构的剖面图；
图2为图1中左隔磁压条的立体结构图；
图3为图2中右隔磁压条的立体结构图；
图4为图1中永磁体固定结构的三维立体图；
图5为本发明第二种具体实施方式中永磁体固定结构的剖面图；
图6为图5中左隔磁压条的立体结构图；
图7为图5中右隔磁压条的立体结构图；
图8为图5中永磁体固定结构的三维立体图。
图1至图8中的附图标记如下：
1-转子铁心；2-螺母，21-螺钉；3-垫圈；4-永磁体；5-左隔磁压条；6- 右隔磁压条；8-挡圈。
具体实施方式
下面结合附图和具体实施方式对本申请作进一步描述：
一种永磁体固定结构，包括转子铁心1、永磁体4和隔磁压条；永磁体4通过两相邻的所述隔磁压条安装于转子铁心1的内表面或外表面，即该发明既适用于内转子永磁直驱电机，也适用于外转子永磁直驱电机，为方便说明，本发明对应附图均为外转子电机中永磁体固定结构的设置情况。
在电机的轴向上，永磁体4和隔磁压条均可以作成多段，使永磁体4的总长度与转子铁心相匹配即可。
另外，可设置挡圈8对永磁体4的轴向进行定位，通常其设置在永磁体4的轴向两端。
上述永磁体固定结构中所述隔磁压条包括条身和分别位于所述条身两侧的压头、若干连接件，所述隔磁压条在径向上贯穿转子铁心1且所述压头和所述连接件分别位于转子铁心1的两侧；也即转子铁心1上设置有方便隔磁压条穿过的通孔。
其中所述压头的截面优选燕尾形，当然也可以为其他形状比如T形，为方便设置所述连接件，所述条身可以设置为矩形。
永磁体4通过相邻的所述压头安装于转子铁心1的内表面或外表面，相应地，所述转子铁心1的外表面或内表面对应位置设有安装沉孔，以容纳所述连接件以及与其配合的紧固件。
所述连接件与所述紧固件螺纹相接，所述隔磁压条中所述条身的宽度小于所述连接件上螺纹或者螺纹孔的直径，从而在相邻永磁体4之间空间较小的条件下，能采用较大尺寸规格的螺钉21或螺母2来固定永磁体4，从而达到较大紧固力的螺纹紧固结构。
所述连接件通常在所述条身上均匀分布，数量可以有多个。所述连接件与所述条身之间可以为焊接。
永磁体4与所述压头相接的侧面与所述压头形状相匹配，也即在外转子电机中所述永磁体固定结构中的永磁体4的向心面具有削角结构，所述 压条的向心端相应的为燕尾形，因此装配后相邻压头的燕尾之间的距离小于永磁体4的宽度，以保证永磁体4不会向心脱落。永磁体4与所述压头之间可设置为间隙配合，以方便安装。
另外上述机械装配完成后，永磁体4、所述隔磁压条与转子铁心1之间的空隙均灌胶密封，将隔磁压条与永磁体4之间的空隙填满，使其成为一体，紧固力进一步增强且在永磁体4外表面产生一层保护膜，有利于永磁体4的防腐性能。
上述永磁体固定结构解决了甚多极数电机在小尺寸空间条件下，转子表面永磁体可靠固定的问题。
在第一种具体实施方式中，所述连接件为螺杆，所述紧固件为可与所述螺杆相匹配的螺母2，所述螺杆与螺母2的连接处还可以设置有垫圈3。
安装时，所述螺杆穿过转子铁心1上的通孔，在转子铁心1的沉孔处外套垫圈3和螺母2，通过螺纹紧固所述隔磁压条。
为加强防松，可考虑的垫圈有平垫圈GB97；弹簧垫圈GB93；碟形弹簧GB1972；锥形锁紧垫圈GB956.1。同时螺母2还可考虑采用二个螺母并紧，比如螺母GB6170加螺母GB6174薄型，或者螺母GB6170加扣紧螺母GB805；或者直接采用锁紧螺母GB6185.1也即。
在第二种具体实施方式中，所述连接件为具有螺纹孔的圆柱体，所述紧固件为可与所述螺纹孔相匹配的螺钉21，所述螺纹孔与螺钉21的连接处还可以设置有垫圈3。
安装时，所述圆柱体插入转子铁心1的内侧沉孔中，螺钉2套上垫圈3后，穿过转子铁心1中的光孔，插入所述圆柱体的螺纹孔内，通过螺纹紧固压条。
上述外转子电机的永磁体固定结构中，转子铁心1的外表面上均设置有可容纳所述紧固件的安装沉孔，装配后所述紧固件的外侧表面低于转子铁心1的外表面。若为内转子电机，则相应在转子铁心1的内表面上设置可容纳所述紧固件的安装沉孔即可。
由于上述永磁体固定结构中，所述压条的宽度小于所述连接件上螺纹或者螺纹孔的直径，从而在相邻永磁体4圆周方向之间空间尺寸较小的条 件下，能采用较大尺寸规格的螺钉或螺母来固定永磁体，达到较大紧固力的螺纹紧固结构。例如，在下部压条宽度小于4mm时，上部螺纹孔的螺径可为M6及以上，以保证螺纹有一定的机械强度。
作为一种改进，可对所述隔磁压条上的所述连接件作进一步设置：
将用于固定同一永磁体4的两相邻所述隔磁压条上所述连接件的位置设置为不同，优选交错分布，此时，设置于转子铁心1内表面或外表面上的安装沉孔沿转子铁心1的轴向错开分布，具体可见图4和图8。这样的话，可有助于改善转子铁心的机械强度，减少开孔对于转子铁心带来的影响。
还可以将用于固定同一永磁体的两相邻所述隔磁压条上所述连接件的数量设置为不同，比如相差一个，此时相邻的左隔磁压条5和右隔磁压条6上的所述连接件安装后形成的交错效果更好。
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似部分互相参见即可。
以上所述仅为本申请的较佳实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (7)

  1. 一种永磁体固定结构，包括转子铁心、永磁体和隔磁压条，其特征在于，
    所述隔磁压条包括条身和分别位于所述条身两侧的压头、若干连接件，所述隔磁压条在径向上贯穿所述转子铁心且所述压头和所述连接件分别位于所述转子铁心的两侧；
    所述永磁体通过相邻的所述压头安装于所述转子铁心的内表面或外表面，相应地，所述转子铁心的外表面或内表面对应位置设有安装沉孔，以容纳所述连接件以及与其配合的紧固件；所述连接件与所述紧固件螺纹相接；所述隔磁压条中所述条身的宽度小于所述连接件上螺纹或者螺纹孔的直径；
    所述永磁体、所述隔磁压条与所述转子铁心之间的空隙均灌胶密封。
  2. 如权1所述的永磁体固定结构，其特征在于，
    所述连接件为螺杆，所述紧固件为与所述螺杆相匹配的螺母。
  3. 如权1所述的永磁体固定结构，其特征在于，
    所述连接件为具有螺纹孔的圆柱体，所述紧固件为与所述螺纹孔相匹配的螺钉。
  4. 如权1-3任一项所述的永磁体固定结构，其特征在于，
    相邻的所述隔磁压条上所述连接件交错分布。
  5. 如权4所述的永磁体固定结构，其特征在于，
    相邻所述隔磁压条上所述连接件的数量不同。
  6. 如权5所述的永磁体固定结构，其特征在于，
    所述永磁体的轴向两侧均设置有挡圈。
  7. 如权6所述的永磁体固定结构，其特征在于，
    所述压条的截面为燕尾形，所述永磁体与所述压条相接的侧面与所述压条形状相匹配。
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