WO2019010933A1 - 一种外转子永磁伺服电机 - Google Patents

一种外转子永磁伺服电机 Download PDF

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Publication number
WO2019010933A1
WO2019010933A1 PCT/CN2018/071864 CN2018071864W WO2019010933A1 WO 2019010933 A1 WO2019010933 A1 WO 2019010933A1 CN 2018071864 W CN2018071864 W CN 2018071864W WO 2019010933 A1 WO2019010933 A1 WO 2019010933A1
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WIPO (PCT)
Prior art keywords
bearing
bolt
outer rotor
rotating shaft
permanent magnet
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PCT/CN2018/071864
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English (en)
French (fr)
Inventor
孙文林
樊桂生
Original Assignee
深圳市东方伺服数控技术有限公司
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Application filed by 深圳市东方伺服数控技术有限公司 filed Critical 深圳市东方伺服数控技术有限公司
Publication of WO2019010933A1 publication Critical patent/WO2019010933A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/22—Optical devices

Definitions

  • the invention relates to the technical field of permanent magnet synchronous motors, in particular to an outer rotor permanent magnet servo motor.
  • the outer rotor permanent magnet servo motor generally has the following two structures: one is the rotor outside and the stator is inside; the other is the stator is outside and the rotor is outside.
  • the outer rotor permanent magnet servo motor with outer rotor structure is supported by crossed roller bearings, and the crossed roller bearings are installed at the upper end of the motor, which thickens the height of the motor, which limits the installation conditions of the motor and reduces its general purpose. Sex.
  • the technical problem to be solved by the present invention is to provide an outer rotor permanent magnet servo motor for the above-mentioned defects of the prior art, which aims to solve the problem of high motor height and poor versatility in the prior art.
  • An outer rotor permanent magnet servo motor includes a rotor assembly and a stator assembly, the rotor assembly including: an upper end cover, an outer rotor fixedly coupled to a lower end surface of the upper end cover, and a rotating shaft fixedly coupled to a lower bearing cover at a lower end of the rotating shaft, A magnet is fixed on the inner side of the outer rotor, wherein the stator assembly comprises: a winding, a bearing seat and a bearing disposed between the magnet and the rotating shaft in order from the outside to the inside, wherein the lower end of the bearing seat is fixedly connected with a motor base, and the winding is The stator core and the winding wound on the stator core, the upper end surface of the stator core or the upper end surface of the bearing seat is fixed with a code disc reading head, and the upper surface of the code disc reading head is adapted to have a shaft rotating synchronously with the rotating shaft Reflective photoelectric code disk.
  • the outer rotor permanent magnet servo motor wherein the winding is selected as a fractional slot concentrated winding.
  • the outer rotor permanent magnet servo motor wherein the code disc read head is fixed to an upper end surface of the bearing housing, and the axial reflective optical code disc is fixed to the rotating shaft, the stator iron The upper end surface of the core shares a plane with the upper end surface of the bearing housing, the code head reading head is fixed to the plane, and the axial reflection type optical code disc is fixed to the upper end cover.
  • the outer rotor permanent magnet servo motor wherein the bearing is provided with two upper and lower bearings respectively; a limiting protrusion is extended on the inner side of the bearing seat; and the lower end of the upper bearing Supporting the limiting protrusion, the upper end is attached to the rotating shaft; and the upper end surface of the lower bearing is limited to the limiting protrusion.
  • the outer rotor permanent magnet servo motor has a lower bearing cap fixed to a lower end surface of the rotating shaft, and a lower bearing end surface supported by the lower bearing cap.
  • the outer rotor permanent magnet servo motor wherein the rotor assembly is composed of only the upper end cover, the outer rotor, the magnet, the rotating shaft, the lower bearing cover, and the axial reflective photoelectric code disk.
  • the outer rotor permanent magnet servo motor wherein the stator assembly is composed of only the winding, the bearing housing, the upper bearing, the lower bearing, the motor base, and the code head.
  • the outer rotor permanent magnet servo motor wherein a lower end of the outer rotor extends with a rotating protrusion, and an upper end of the motor base is adapted to the rotating protrusion to be provided with a rotating guiding groove, and the rotating convex Both the starting and the rotating guide grooves are ring-shaped.
  • the outer rotor permanent magnet servo motor wherein the outer rotor permanent magnet servo motor further comprises: a connecting component, which is composed of a first bolt, a second bolt, a third bolt and a fourth bolt;
  • the upper end cover and the outer rotor are connected via the first bolt, the upper end surface is adapted to be that the first bolt is provided with a first receiving groove, and the outer rotor is adapted to the first bolt is provided with a first threaded hole ;
  • the upper end cover and the rotating shaft are connected via the second bolt, the upper end cover is adapted to be provided with a second receiving groove, and the rotating shaft is adapted to the second bolt to be provided with a second threaded hole;
  • the motor base and the bearing housing are connected via the third bolt, the motor base is adapted to the third bolt, and the third bolt is disposed, the bearing seat is adapted to the third bolt, and the third threaded hole is disposed. ;
  • the lower bearing cap is coupled to the rotating shaft via the fourth bolt, the lower bearing cap is adapted to the fourth bolt, and the fourth bolt is disposed, and the rotating shaft is adapted to the fourth bolt, and the fourth threaded hole is disposed. .
  • the outer rotor permanent magnet servo motor wherein the inner end cover is provided with a first bearing hole, the rotating shaft is provided with a second bearing hole, and the lower bearing cover is provided with a third bearing hole.
  • the motor base is provided with a fourth bearing hole, and the first bearing hole, the second bearing hole, the third bearing hole and the fourth bearing hole have the same diameter.
  • the outer rotor permanent magnet servo motor provided by the invention adopts an outer rotor and a rotating shaft fixed to the lower end surface of the upper end cover, and is sequentially disposed on the winding, the bearing seat and the bearing between the outer rotor and the rotating shaft, and is disposed at the lower end of the bearing.
  • the motor base is arranged on the upper end surface of the stator core or the upper end of the bearing housing, and the axial reflective photoelectric code disc is matched with the code head reading head; so that the outer rotor permanent magnet servo motor can be built in the motor stator
  • the core bearing eliminates the need for an external crossed roller bearing, which reduces the overall height of the motor and improves the versatility of the motor.
  • Figure 1 is a schematic view showing the structure of a preferred embodiment of an outer rotor permanent magnet servo motor of the present invention.
  • FIG. 2 is a schematic view showing the structure of another preferred embodiment of the outer rotor permanent magnet servo motor of the present invention.
  • FIG. 1 is a schematic structural view of a preferred embodiment of an outer rotor permanent magnet servo motor according to the present invention
  • FIG. 2 is a schematic structural view of another preferred embodiment of the outer rotor permanent magnet servo motor of the present invention.
  • the outer rotor permanent magnet servo motor (which may be referred to as a motor) provided by the present invention mainly has the following two key improvements.
  • the present invention is built in the motor (here, the built-in refers to the upper end).
  • the bearing of the inner cavity formed by the cover, the outer rotor and the motor base, and the prior art adopts a cross roller bearing, which is disposed outside the motor, and the height thereof is inevitably increased, so that the device with limited installation space cannot use the motor.
  • the versatility is inevitable;
  • the invention adopts an axial reflection type optical code disc and sets it into a sheet shape, and then detects the rotation angle of the motor through a code disc read head located directly below it, and the overall size of the motor can be Be smaller.
  • the outer rotor permanent magnet servo motor comprises: a rotor assembly, a stator assembly and a connection assembly.
  • the motor consists of only three, that is to say, except for the three components, does not contain any other Parts.
  • the connection component can be set without being replaced by other connection methods, such as a snap connection.
  • the rotor assembly includes: an upper end cover 1, an outer rotor 2 attached to an outer edge of a lower end surface of the upper end cover 1, and a rotating shaft attached to an inner edge of a lower end surface of the upper end cover 1. 3.
  • the rotor assembly consists of and consists solely of the above structure.
  • the lower end outer edge of the upper end cover 1 is provided with a rotating boss.
  • the upper end of the outer rotor 2 is sleeved on the outside, and is connected via a first bolt.
  • the lower end inner edge of the upper end cover 1 is provided with a rotating concave table.
  • the first end and the second bolt are respectively provided with a first receiving groove and a second receiving groove, and the outer rotor 2 is adapted to the first bolt.
  • a first threaded hole is provided, and the rotating shaft 3 is adapted to the second bolt to be provided with a second threaded hole.
  • the first bolt and the second bolt are important components of the connection assembly, and are respectively disposed at a plurality of intervals on the upper end cover 1.
  • the first bolt passes through the upper end cover 1 and is screwed to the outer rotor 2 during assembly. Similarly, the second bolt passes through.
  • the upper end cover 1 is screwed to the rotating shaft 3, and the bolted connection is convenient in assembly and high in stability.
  • a rotating protrusion is disposed on the lower end of the outer rotor 2, and the rotating protrusion is disposed on the upper end of the motor base 6 to provide a rotation guiding groove, and the rotating protrusion and the rotating guiding groove are ring-shaped.
  • the upper end of the outer rotor 2 has an engaging protrusion extending upwardly, and the upper end cover 1 is provided with an engaging groove for the engaging protrusion, and the engaging protrusion extends inward from the outer edge of the outer rotor 2. , about 1/4 to 1/3 of the size of the upper end surface of the outer rotor 2, and the engaging protrusion is inwardly the position where the first bolt is disposed.
  • the axially reflective photoelectric code disk 9 is preferably arranged in a ring shape, on which is marked a strip of reflected light for use as a basis for detecting the angle of rotation of the motor.
  • the specific setting location is as follows:
  • the first code wheel read head 10 is fixed to an upper end surface of the bearing housing 4, and the axial reflective photoelectric code disk 9 is fixed to the rotating shaft 3.
  • the specific setting position of the code head read head 10 can be in three forms: 1. fixed to the upper end surface of the stator core; 2. fixed to the upper end surface of the bearing housing 4; 3. partially fixed to the upper end surface of the stator core, and A part is fixed to the upper end surface of the bearing housing 4.
  • the stator assembly includes a winding 7, a bearing housing 4 and a bearing disposed in order from the outside to the inside, and a motor base 6 fixed to the lower end of the bearing housing 4, and a code head read head 10.
  • the bearing is provided with two upper and lower.
  • the stator assembly is read by and only by the winding 7, the bearing housing 4, the upper bearing 11, the lower bearing 12, the motor base 6 and the code wheel.
  • the first 10 is composed.
  • the winding 7 is composed of a stator core and a winding, and uses a fractional slot concentrated winding.
  • a rotational gap is provided between the winding 7 and the magnet 8 for preventing the magnet 8 and the winding 7 from rubbing against each other.
  • a limiting protrusion is disposed on the inner side of the bearing housing 4; a lower end of the upper bearing 11 is supported by the limiting protrusion, and an upper end is attached to the upper end cover 1; an upper end surface of the lower bearing 12 is limited to the limit The lower end surface is supported by the lower bearing cover 5. That is, the bearing housing 4 is in a "convex" shape that is rotated 90° clockwise.
  • the upper end of the motor base 6 is provided with a rotating boss bearing seat 4, and is connected thereto via a third bolt.
  • the motor base 6 is adapted to the third bolt, and a third receiving groove is provided.
  • the third bolt is adapted to be provided with a third threaded hole.
  • the lower bearing cover 5 and the rotating shaft 3 are connected via the fourth bolt, the lower bearing cover 5 is adapted to the fourth bolt, and a fourth receiving groove is provided, and the rotating shaft 3 is adapted to the fourth bolt.
  • the fourth threaded hole has an axial preload force on the bearing by controlling the mounting clearance of the rotating shaft 3 and the bearing seat 4 in the longitudinal direction and the tightening torque of the fourth bolt, so that the rotor assembly rotates without a turning gap.
  • the axial reflection grating ring 9 is mounted on the rotating shaft 3 to improve the control precision of the rotor permanent magnet direct drive servo motor.
  • the axial runout of the reflective grating disk ring and the radial oscillation of the grating center are as small as possible.
  • a plastic tank 14 is disposed on the rotating shaft 3, and the axial reflective grating disk is round. The non-reflecting surface of the ring piece abuts against the upper plane of the rotating shaft 3, and is bonded to the rotating shaft 3 at the glue receiving groove 14, which reduces the influence of the thickness variation of the rubber layer on the mounting precision.
  • the connecting component is composed of the first bolt, the second bolt, the third bolt and the fourth bolt.
  • the upper end cover and the outer rotor can be die-cast and integrally formed, and the first bolt of the corresponding connecting component is omitted, and the upper end cover and the rotating shaft can be die-cast and processed into one body, thereby eliminating the need for the invention.
  • Corresponding connection assembly second bolt can be die-cast and integrally formed, and the first bolt of the corresponding connecting component is omitted, and the upper end cover and the rotating shaft can be die-cast and processed into one body, thereby eliminating the need for the invention.
  • Corresponding connection assembly second bolt can be die-cast and integrally formed, and the first bolt of the corresponding connecting component is omitted, and the upper end cover and the rotating shaft can be die-cast and processed into one body, thereby eliminating the need for the invention.
  • Corresponding connection assembly second bolt can be die-cast and integrally formed, and the first bolt of the corresponding connecting component is omitted, and the upper end cover and the rotating shaft can be die-cast and processed into one body, thereby eliminating the need for the invention.
  • the bearing is preferably an angular contact bearing, and the rotation angle of the motor is detected.
  • a magnetic grid, a multi-stage rotary transformer, or the like can also be used.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Permanent Magnet Type Synchronous Machine (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Brushless Motors (AREA)

Abstract

一种外转子永磁伺服电机，包括：转子组件及定子组件，所述转子组件包括：上端盖（1），固定连接于上端盖（1）下端面的外转子（2）及转轴（3），固定连接于转轴（3）下端的下轴承盖（5），所述外转子（2）内侧固定有磁体（8），所述定子组件包括：由外到内依次设置于磁体（8）与转轴（3）之间的绕组（7）、轴承座（4）及轴承，所述轴承座（4）下端固定连接有电机底座（6），所述绕组（7）由定子铁芯及缠绕于定子铁芯上的绕线组成，所述定子铁芯上端面或轴承座（4）上端面固定有一码盘读头（10），所述码盘读头（10）上方适配有一随转轴（3）同步旋转的轴向反射式光电码盘（9）。该电机使得外转子永磁伺服电机可采用内置于电机的轴承，不必外接交叉滚子轴承，减小了电机的整体高度，提高了电机通用性。

Description

一种外转子永磁伺服电机 技术领域
本发明涉及永磁同步电机技术领域，尤其涉及的是一种外转子永磁伺服电机。
背景技术
现有技术中，外转子永磁伺服电机总的来说有以下两种结构：一种是转子在外，定子在内；另一种是定子在外，转子外内。而具有外转子结构的外转子永磁伺服电机采用交叉滚子轴承做支撑，交叉滚子轴承安装于电机的上端，加厚了电机的高度，使得电机的安装条件受到了限制，降低了其通用性。
因此，现有技术还有待于改进和发展。
发明内容
本发明要解决的技术问题在于，针对现有技术的上述缺陷，提供一种外转子永磁伺服电机，旨在解决现有技术中电机高度大，通用性差的问题。
本发明解决技术问题所采用的技术方案如下：
一种外转子永磁伺服电机，包括转子组件及定子组件，所述转子组件包括：上端盖，固定连接于上端盖下端面的外转子及转轴，固定连接于转轴下端的下轴承盖，所述外转子内侧固定有磁体，其中，所述定子组件包括：由外到内依次设置于磁体与转轴之间的绕组、轴承座及轴承，所述轴承座下端固定连接有电机底座，所述绕组由定子铁芯及缠绕于定子铁芯上的绕线组成，所述定子铁芯上端面或轴承座上端面固定有一码盘读头，所述码盘读头上方适配有一随转轴同步旋转的轴向反射式光电码盘。
优选方案中，所述的外转子永磁伺服电机，其中，所述绕组选择为分数槽集中绕组。
优选方案中，所述的外转子永磁伺服电机，其中，所述码盘读头固定于所述轴承座上端面，所述轴向反射式光电码盘固定于所述转轴，所述定子铁芯上端面与轴承座上端面共用一平面，所述码盘读头固定于该平面，所述轴向反射式光电码盘固定于所述上端盖。
优选方案中，所述的外转子永磁伺服电机，其中，所述轴承设置有两个，分别为上轴承及下轴承；所述轴承座内侧延伸设置有一限位凸起；所述上轴承下端支撑于所述限位凸起，上端贴合于转轴；所述下轴承上端面限位于所述限位凸起。
优选方案中，所述的外转子永磁伺服电机，其中，所述转轴下端面固定有下轴承盖，所述下轴承下端面支撑于所述下轴承盖。
优选方案中，所述的外转子永磁伺服电机，其中，所述转子组件由且仅由所述上端盖、外转子、磁体、转轴、下轴承盖及轴向反射式光电码盘组成。
优选方案中，所述的外转子永磁伺服电机，其中，所述定子组件由且仅由所述绕组、轴承座、上轴承、下轴承、电机底座及码盘读头组成。
优选方案中，所述的外转子永磁伺服电机，其中，所述外转子下端延伸设置有一旋转凸起，所述电机底座上端适配所述旋转凸起设置有一旋转导向槽，所述旋转凸起及旋转导向槽皆呈环型。
优选方案中，所述的外转子永磁伺服电机，其中，所述外转子永磁伺服电机还包括：连接组件，由第一螺栓、第二螺栓、第三螺栓及第四螺栓组成；
所述上端盖与外转子经由所述第一螺栓连接，所述上端面适配所述第一螺栓设置有第一收容槽，所述外转子适配所述第一螺栓设置有第一螺纹孔；
所述上端盖与转轴经由所述第二螺栓连接，所述上端盖适配第二螺栓设置有第二收容槽，所述转轴适配所述第二螺栓设置有第二螺纹孔；
所述电机底座与轴承座经由所述第三螺栓连接，所述电机底座适配所述第三螺栓设置有第三收容槽，所述轴承座适配所述第三螺栓设置有第三螺纹孔；
所述下轴承盖与转轴经由所述第四螺栓连接，所述下轴承盖适配所述第四螺栓设置有第四收容槽，所述转轴适配所述第四螺栓设置有第四螺纹孔。
优选方案中，所述的外转子永磁伺服电机，其中，所述上端盖内侧设置有第一轴承孔，所述转轴设置有第二轴承孔，所述下轴承盖设置有第三轴承孔，所述电机底座设置有第四轴承孔，所述第一轴承孔、第二轴承孔、第三轴承孔及第四轴承孔的直径相同。
本发明所提供的外转子永磁伺服电机，由于采用了固定于上端盖下端面的外 转子及转轴，依次设置于外转子与转轴之间的绕组、轴承座及轴承，以及设置于轴承下端的电机底座，设置于定子铁芯上端面或轴承座上端面的码盘读头，与码盘读头适配的轴向反射式光电码盘；使得外转子永磁伺服电机可采用内置于电机定子铁芯的轴承，不必使用外接交叉滚子轴承，减小了电机的整体高度，提高了电机通用性；而且通过轴向反射式光电码盘与带细分或正余弦输出的高精度码盘读头的配合，使轴向反射式光电码盘可制作成片状，给进一步降低电机的高度及体积留出了余地。
附图说明
图1是本发明外转子永磁伺服电机较佳实施例的结构示意图。
图2是本发明外转子永磁伺服电机另一较佳实施例的结构示意图。
附图标号说明：1、上端盖，2、外转子，3、转轴，4、轴承座，5、下轴承盖，6、电机底座，7、电机定子铁芯及绕组，8、磁体，9、轴向反射式码盘，10、码盘数头，11、上轴承，12、下轴承，14、容胶槽。
具体实施方式
为使本发明的目的、技术方案及优点更加清楚、明确，以下参照附图并举实施例对本发明进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。
图1是本发明外转子永磁伺服电机较佳实施例的结构示意图；图2是本发明外转子永磁伺服电机另一较佳实施例的结构示意图。
本发明所提供的外转子永磁伺服电机(可简称为电机)与现有技术相比，主要有以下两个重点改进，第一、本发明采用内置于电机(此处内置是指设置于上端盖、外转子及电机底座形成的内腔)的轴承，而现有技术采用交叉滚子轴承，将其设置于电机外部，必然增加其高度，那么安装空间有限的设备就无法采用该种电机，通用性差是必然的；第二、本发明通过轴向反射式光电码盘，并将其设置为片状，而后通过位于其正下方的码盘读头检测电机旋转角度，可以将电机的整体尺寸做到更小。
所述外转子永磁伺服电机包括：转子组件、定子组件及连接组件，在进一步 地优选实施例中，电机由且仅由三者组成，也就是说，除三个组件外，不包含其他任何零部件。当然，连接组件可以不设置，而由其他连接方式替代，如卡扣连接等。
如图1及图2所示，所述转子组件包括：上端盖1、贴合于所述上端盖1下端面外边缘的外转子2、贴合于所述上端盖1下端面内边缘的转轴3、轴向反射式光电码盘9、贴合于所述外转子2内侧的磁体8及固定于转轴3下端面的下轴承盖5。在进一步地较佳实施例中，所述转子组件由且仅由上述结构组成。
所述上端盖1的下端外缘设置有旋转凸台外转子2上端内孔套装在外部，再经由第一螺栓连接，所述上端盖1的下端内缘设置有旋转凹台转轴3上端套装在内部，再经由第二螺栓连接，所述上端盖1适配所述第一螺栓及第二螺栓分别设置有第一收容槽及第二收容槽，所述外转子2适配所述第一螺栓设置有第一螺纹孔，所述转轴3适配所述第二螺栓设置有第二螺纹孔。所述第一螺栓及第二螺栓为连接组件的重要组成部分，分别设置有多个间隔设置于上端盖1。根据第一收容槽、第一螺纹孔、第二收容槽及第二螺纹孔的设置位置可知，在装配时，第一螺栓经过上端盖1后拧紧于外转子2，同理，第二螺栓经过上端盖1后拧紧于转轴3，螺栓连接的形式装配方便性及稳定性高。
所述外转子2下端向下延伸设置有一旋转凸起，所述电机底座6上端适配所述旋转凸起设置有一旋转导向槽，所述旋转凸起及旋转导向槽皆呈环型。所述外转子2上端向上延伸设置有一卡合凸起，而所述上端盖1适配所述卡合凸起设置有一卡合槽，所述卡合凸起由外转子2外缘向内延伸，约占外转子2上端面尺寸的1/4至1/3，卡合凸起再向内即为第一螺栓的设置位置。
所述轴向反射式光电码盘9优选设置成环状，其上刻画有反射光的刻度条，用于作为检测电机旋转角度的依据。其具体设置位置由以下两种方案：
如图1所示，第一、所述码盘读头10固定于所述轴承座4上端面，所述轴向反射式光电码盘9固定于所述转轴3。
如图2所示，第二、所述定子铁芯上端面与轴承座4上端面共用一平面，所述码盘读头10固定于该平面，所述轴向反射式光电码盘9固定于所述上端盖1。 也就是说，码盘读头10的具体设置位置可以有三种形式：1、固定于定子铁芯上端面；2、固定于轴承座4上端面；3、一部分固定于定子铁芯上端面，另一部分固定于轴承座4上端面。
所述定子组件包括：由外向内依次设置的绕组7、轴承座4及轴承，以及固定连接于轴承座4下端的电机底座6，码盘读头10。所述轴承设置有上下两个，在进一步的较佳实施例中，所述定子组件由且仅由所述绕组7、轴承座4、上轴承11、下轴承12、电机底座6及码盘读头10组成。
所述绕组7由定子铁芯及绕线两部分组成，采用分数槽集中绕组。所述绕组7与磁体8之间设置有旋转间隙，用于防止磁体8与绕组7相互磨擦。
所述轴承座4内侧延伸设置有一限位凸起；所述上轴承11下端支撑于所述限位凸起，上端贴合于上端盖1；所述下轴承12上端面限位于所述限位凸起，下端面支撑于所述下轴承盖5。也就是说，所述轴承座4呈顺时针旋转90°的“凸”字型。
所述电机底座6的上端设置有旋转凸台轴承座4套装在上面，再经由第三螺栓连接，所述电机底座6适配所述第三螺栓设置有第三收容槽，所述轴承座4适配所述第三螺栓设置有第三螺纹孔。所述下轴承盖5与转轴3经由所述第四螺栓连接，所述下轴承盖5适配所述第四螺栓设置有第四收容槽，所述转轴3适配所述第四螺栓设置有第四螺纹孔，通过控制转轴3与轴承座4长度方向的安装间隙及第四螺栓的紧固力矩给轴承加一个轴向予紧力使转子组件旋转时没有转动间隙。
在本发明较佳实施例图1中，轴向反射式光栅码盘圆环片9，在转轴3上的安装精度是提高此外转子永磁直驱伺服电机控制精度的关键，在电机旋转时轴向反射式光栅码盘圆环片的轴向跳动和光栅中心的径向摆动要尽可能的小，此具体实施例中在转轴3上设置了容胶槽14，轴向反射式光栅码盘圆环片的非反射面紧靠在转轴3的上部平面，在容胶槽14处和转轴3粘结，减小了胶层厚度变化对安装精度的影响。
在本发明较佳实施例中，所述连接组件即由所述第一螺栓、第二螺栓、第三 螺栓及第四螺栓组成。
在本发明较佳实施例中，所述上端盖与外转子间可以压铸成型加工成一体，省去了相应的连接组件第一螺栓，上端盖与转轴间可以压铸成型加工成一体，省去了相应的连接组件第二螺栓。
在本发明较佳实施例中，所述的轴承优先选用角接触轴承，检测电机旋转角度，也可以采用磁栅、多级旋转变压器等等。
应当理解的是，本发明的应用不限于上述的举例，对本领域普通技术人员来说，可以根据上述说明加以改进或变换，所有这些改进和变换都应属于本发明所附权利要求的保护范围。

Claims (10)

  1. 一种外转子永磁伺服电机，包括转子组件及定子组件，所述转子组件包括：上端盖，固定连接于上端盖下端面的外转子及转轴，固定连接于转轴下端的下轴承盖，所述外转子内侧固定有磁体，其特征在于，所述定子组件包括：由外到内依次设置于磁体与转轴之间的绕组、轴承座及轴承，所述轴承座下端固定连接有电机底座，所述绕组由定子铁芯及缠绕于定子铁芯上的绕线组成，所述定子铁芯上端面或轴承座上端面固定有一码盘读头，所述码盘读头上方适配有一随转轴同步旋转的轴向反射式光电码盘。
  2. 根据权利要求1所述的外转子永磁伺服电机，其特征在于，所述绕组选择为分数槽集中绕组。
  3. 根据权利要求1所述的外转子永磁伺服电机，其特征在于，所述码盘读头固定于所述轴承座上端面，所述轴向反射式光电码盘固定于所述转轴，所述定子铁芯上端面与轴承座上端面共用一平面，所述码盘读头固定于该平面，所述轴向反射式光电码盘固定于所述上端盖。
  4. 根据权利要求3所述的外转子永磁伺服电机，其特征在于，所述轴承设置有两个，分别为上轴承及下轴承；所述轴承座内侧延伸设置有一限位凸起；所述上轴承下端支撑于所述限位凸起，上端贴合于转轴；所述下轴承上端面限位于所述限位凸起。
  5. 根据权利要求4所述的外转子永磁伺服电机，其特征在于，所述转轴下端面固定有下轴承盖，所述下轴承下端面支撑于所述下轴承盖。
  6. 根据权利要求5所述的外转子永磁伺服电机，其特征在于，所述转子组件由且仅由所述上端盖、外转子、磁体、转轴、下轴承盖及轴向反射式光电码盘组成。
  7. 根据权利要求4至6中任意一项所述的外转子永磁伺服电机，其特征在于，所述定子组件由且仅由所述绕组、轴承座、上轴承、下轴承、电机底座及码盘读头组成。
  8. 根据权利要求1所述的外转子永磁伺服电机，其特征在于，所述外转子下端延伸设置有一旋转凸起，所述电机底座上端适配所述旋转凸起设置有一旋转 导向槽，所述旋转凸起及旋转导向槽皆呈环型。
  9. 根据权利要求1所述的外转子永磁伺服电机，其特征在于，所述外转子永磁伺服电机还包括：连接组件，由第一螺栓、第二螺栓、第三螺栓及第四螺栓组成；
    所述上端盖与外转子经由所述第一螺栓连接，所述上端盖适配所述第一螺栓设置有第一收容槽，所述外转子适配所述第一螺栓设置有第一螺纹孔；
    所述上端盖与转轴经由所述第二螺栓连接，所述上端盖适配第二螺栓设置有第二收容槽，所述转轴适配所述第二螺栓设置有第二螺纹孔；
    所述电机底座与轴承座经由所述第三螺栓连接，所述电机底座适配所述第三螺栓设置有第三收容槽，所述轴承座适配所述第三螺栓设置有第三螺纹孔；
    所述下轴承盖与转轴经由所述第四螺栓连接，所述下轴承盖适配所述第四螺栓设置有第四收容槽，所述转轴适配所述第四螺栓设置有第四螺纹孔。
  10. 根据权利要求1所述的外转子永磁伺服电机，其特征在于，所述上端盖内侧设置有第一轴承孔，所述转轴设置有第二轴承孔，所述下轴承盖设置有第三轴承孔，所述电机底座设置有第四轴承孔，所述第一轴承孔、第二轴承孔、第三轴承孔及第四轴承孔的直径相同。
PCT/CN2018/071864 2017-07-14 2018-01-09 一种外转子永磁伺服电机 WO2019010933A1 (zh)

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