WO2021051702A1 - 电机内定子的紧固结构 - Google Patents

电机内定子的紧固结构 Download PDF

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Publication number
WO2021051702A1
WO2021051702A1 PCT/CN2019/128248 CN2019128248W WO2021051702A1 WO 2021051702 A1 WO2021051702 A1 WO 2021051702A1 CN 2019128248 W CN2019128248 W CN 2019128248W WO 2021051702 A1 WO2021051702 A1 WO 2021051702A1
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WIPO (PCT)
Prior art keywords
stator
hole
fastening structure
fastening
motor according
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PCT/CN2019/128248
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English (en)
French (fr)
Inventor
杨奇飞
赵云峰
卫云
阳小兰
陈予中
胡国庆
Original Assignee
安徽皖南电机股份有限公司
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Publication of WO2021051702A1 publication Critical patent/WO2021051702A1/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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
    • H02K1/187—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to inner stators

Definitions

  • the present invention relates to the technical field of motors, and in particular to a fastening structure of a stator in a motor.
  • the traditional inner stator structure is mostly a full circle structure, and many mold tools are required for production.
  • the enameled wire must pass through the stator core slot when winding. Therefore, the enameled wire often encounters the slot damage during the winding process.
  • the full-circle structure of the punching sheet is processed by integral punching and blanking, and the material utilization rate is not high, which seriously restricts the development of this type of motor. Therefore, the ring-shaped stator core structure formed by the stator unit through the tenon and the tenon-groove in series has emerged.
  • the problem with this structure is that if the tenon and the tenon-groove fit too loosely, the motor will produce noise and vibration. If it is too tight, it cannot be assembled. Therefore, how to fasten the stator unit is a problem to be solved urgently.
  • the purpose of the present invention is to provide a fastening structure for the inner stator of the motor with reliable connection and good cooling effect.
  • a fastening structure for the stator of a motor including a stator unit formed by stacking a plurality of stator punching units, and a plurality of stator units are connected in series in the circumferential direction.
  • An annular stator core The inner hole of the annular stator core is provided with a support tube and the two form a fixed connection.
  • the stator unit is provided with a hole or slot. The length of the hole or slot is the same as that of the annular stator core.
  • the mandrel directions are parallel.
  • each stator unit is uniformly radioactive. Move outward to achieve the purpose of supporting the cylinder to tighten the stator unit.
  • the arrangement of holes or slots constitutes a part of the internal circulation air path, optimizing the cooling structure inside the motor, and on the other hand, it is also for the fastening of the stator units to each other. Fasteners provide connection channels.
  • Figure 1 is a perspective view of Embodiment 1 of the present invention.
  • Figure 2 is a front view of Figure 1;
  • Figure 3 is a cross-sectional view of Figure 2;
  • Fig. 4 is a partially enlarged schematic diagram of Fig. 1;
  • Figure 5 is a structural diagram of the fastening cleat in Figure 1;
  • Figure 6 is a cross-sectional view of the support cylinder in Figure 1;
  • Figure 7 is a front view of the stator unit in Figure 1;
  • Figure 8 is a front view of the annular stator core in the second embodiment of the present invention.
  • Fig. 9 is a partially enlarged schematic diagram of Fig. 8.
  • Figure 10 is a front view of the support cylinder in the second embodiment
  • Fig. 11 is a partial enlarged schematic diagram of Fig. 10;
  • Figure 12 is an assembly diagram of the annular stator core and the support cylinder in the second embodiment
  • Figure 13 is a front view of the buckle in the third embodiment of the present invention.
  • Fig. 14 is a left side view of Fig. 13.
  • a fastening structure for a stator in a motor includes a stator unit 10 formed by stacking a plurality of stator punching units, a ring-shaped stator core formed by a plurality of stator units 10 connected in series in the circumferential direction, and a ring-shaped stator
  • the inner hole of the iron core is provided with a support tube 20 and the two form a fixed connection.
  • the stator unit 10 is provided with a hole 11, and the length direction of the hole 11 is parallel to the core axis direction of the annular stator iron core. Since the annular stator core is formed by a plurality of stator units 10 connected in series, the entire annular stator core is loose after assembly. Under the support of the support cylinder 20, each stator unit 10 is balanced and radioactive.
  • a fastening clip 30 for pressing the stator unit 10 is penetrated in the hole 11, and a bolt 40 fixes the fastening clip 30 on the support cylinder 20.
  • a bolt 40 fixes the fastening clip 30 on the support cylinder 20.
  • the fastening tab 30 passes through the hole 11 opened in the stator unit 10 and compresses the stator unit 10, Then the two ends of the fastening clip 30 are fixedly connected to the support cylinder 20 by the bolts 40, so as to ensure the reliable connection between the support cylinder 20 and the stator unit 10.
  • the inner circular surface of the stator unit 10 is provided with a convex rib 16.
  • the length direction of the convex rib 16 is consistent with the axial direction of the stator unit 10, and the outer circular surface of the support cylinder 20 is aligned with the convex rib 16
  • a groove 22 is provided at the corresponding position.
  • the length direction of the groove 22 is consistent with the axial direction of the support cylinder 20.
  • the ribs 16 and the groove 22 are fitted with each other to form an axial and circumferential limit cooperation. Since the stator unit 10 itself is composed of multiple stator punching units, its inner circular surface has a certain degree of roughness.
  • This feature is used to limit the displacement of the stator unit 10 and the support cylinder 20 in the axial direction, plus the convexity.
  • the ribs 16 and the grooves 22 are fitted with each other to limit the displacement of the stator unit 10 and the support cylinder 20 in the circumferential direction, thereby ensuring a reliable connection between the support cylinder 20 and the stator unit 10.
  • the buckles 50 are Z-shaped as a whole, and include a clamping plate 51 and a connecting plate 52 parallel to each other, between the clamping plate 51 and the connecting plate 52 Connected by a transition step 53, the transition step 53 is arranged perpendicular to the clamping plate 51 and the connecting plate 52, the clamping plate 51 is placed in the hole 11 and the plate surface of the clamping plate 51 is provided with a clamping joint 511 protruding toward the wall of the hole 11.
  • the snap joint 511 forms a snap fit with the snap groove provided on the wall of the hole 11, the transition step 53 abuts on the end surface of the stator unit 10, and the connecting plate 52 is attached to the outer wall of the support cylinder 20 and fixedly connected by bolts.
  • the buckle 50 of this structure does not need to pass through the entire hole 11, but only needs to be arranged at the two ends of the hole 11.
  • the clamping plate 51 is connected to the wall of the hole 11 through the clamping joint 511, and the connecting plate 52 is connected by bolts.
  • the annular stator core With the outer wall of the support cylinder 20, the annular stator core is restricted from moving in the circumferential direction relative to the annular support cylinder 20, and then the transition step 53 abuts against the end surface of the stator unit 10 to restrict the annular stator core relative to the circle.
  • the annular support cylinder 20 moves in the axial direction to ensure a reliable connection between the support cylinder 20 and the stator unit 10.
  • support cylinder 20 it is also possible to adopt the support cylinder 20 to be interference embedded in the inner hole of the annular stator core and to be connected as a whole through the heat-sleeve process.
  • a rivet is arranged in the hole 11, and the rivet passes through the stator unit 10 and the support cylinder 20 to fix the two.
  • the fastening clasp 30 is in the shape of a zigzag as a whole, the middle piece 31 is pressed tightly on the wall of the hole 11, and the end pieces 32 at both ends are in close contact with the wall of the support cylinder 20.
  • the sheet 32 is provided with a through hole 321, and the bolt 40 passes through the through hole 321 to be fixedly connected to the support cylinder 20.
  • the middle plate body 31 of the fastening buckle 30 is provided with a reinforcing rib 33.
  • the arrangement of the reinforcing rib 33 not only increases the strength of the fastening buckle 30, but also increases the air inside the stator core and the motor.
  • the contact area improves the cooling cycle inside the motor; in order to ensure that the hole 11 is an internal circulation air path, the ribs 33 are arranged perpendicular to the middle plate 31, and the ribs 33 are arranged perpendicular to the middle plate 31, and
  • the length of the rib piece 33 is the same as the length of the middle plate body 31, and the width of the rib piece 33 is smaller than the width of the hole 11.
  • the support cylinder 20 and the annular stator core are arranged in the same core and the two ends of the support cylinder 20 protrude from the outside of the two ends of the annular stator core.
  • Threaded holes 21 are opened on the walls of the two ends of the supporting barrel 20, and the positions of the threaded holes 21 and the through holes 321 of the fastening cleats 30 are arranged in a one-to-one correspondence.
  • the hole 11 is arranged at a position near the inner end in the radial direction of the stator unit 10, the length of the middle plate body 31 is the same as the length of the hole 11, and the connecting piece 34 between the middle plate body 31 and the end piece 32 and the stator unit The end of 10 rests.
  • the middle plate 31 is pressed tightly on the wall of the hole or slot 11 to limit the radial displacement of the fan-shaped stator unit 10, and the connecting plate 34 abuts against the end of the fan-shaped stator unit 10 to limit the axial displacement of the fan-shaped stator unit 10
  • the support cylinder 20 and the fastening tab 30 are firmly connected by bolts 40, so as to ensure the reliability of the connection between the sector-shaped stator unit 10 and the support cylinder 20.
  • the cross section of the clamping joint 511 is a dovetail shape
  • the cross section of the clamping groove provided on the wall of the hole 11 is also a dovetail shape.
  • the clip joint 511 cannot be removed from the Out of the slot, thereby restricting the annular stator core from moving in the circumferential direction relative to the annular support cylinder 20, and then the transition step 53 abuts on the end surface of the stator unit 10, restricting the annular stator core relative to the annular ring
  • the shaped support cylinder 20 moves in the axial direction to ensure a reliable connection between the support cylinder 20 and the stator unit 10.
  • the structure of the stator unit is described as follows: the stator unit 10 includes teeth 12, the outer ends of the teeth 12 in the radial direction are provided with a shoulder 13 and the inner end is provided with a yoke 14, and the two sides of the teeth 12 are formed.
  • the yoke 14 is provided with a rib 141 and a groove 142 respectively on both sides, and the adjacent stator units 10 are inlaid with each other through the ribs and the grooves 13 and 14.
  • the stator core is composed of a plurality of stator units 10 inlaid with each other. Compared with a full circle, the material utilization rate is high, the punching die is simplified, and it is beneficial to automated mass production.
  • this series structure can be used first. Winding on the stator unit 10, and then assembling it into a ring-shaped stator core, and then connecting the coils of each stator unit 10 in series or in parallel. In this way, the wire is wound in the open space, the process is simple, and the stator slot It does not need to be large, and the slot full rate is high.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

本发明的目的是提供一种连接可靠且冷却效果好的电机内定子的紧固结构，包括由多片定子冲片单元叠压构成的定子单元，多个定子单元在圆周方向相互串接形成的圆环状定子铁芯，圆环状定子铁芯的内孔设置有支撑筒且两者构成固定连接，定子单元上开设有孔或槽，孔或槽的长度方向与圆环状定子铁芯的芯轴方向平行。由于圆环状定子铁芯是由多个定子单元相互串接形成，整个圆环状定子铁芯装配后存在松动，在支撑筒的支撑作用下，各个定子单元均衡地呈放射性地往外移动，实现支撑筒涨紧定子单元的目的，孔或槽的设置一方面构成了内循环风路的一部分，优化了电机内部的冷却结构，另一方面也为将各个定子单元相互紧固连接的紧固件提供连接通道。

Description

电机内定子的紧固结构
技术领域
本发明涉及电机技术领域，具体涉及一种电机内定子的紧固结构。
背景技术
传统的内定子结构多为整圆结构，生产制造需要的模具工装较多，绕线时漆包线必须经过定子铁芯槽口，所以绕线过程中经常出现漆包线碰到槽口伤线的情况，而且整圆结构的冲片采用整体冲压落料加工而成，材料利用率不高，严重制约了该类电机的发展。因此由定子单元通过榫头、榫槽相互串接形成的圆环状定子铁芯结构形式应运而生，但是该结构存在的问题是榫头和榫槽配合如果太松，电机会产生噪音和振动，如果太紧，则又无法装配，因此如何将定子单元紧固连接是亟待解决的问题。
发明内容
本发明的目的是提供一种连接可靠且冷却效果好的电机内定子的紧固结构。
为了实现上述目的，本发明采用的技术方案为：一种电机内定子的紧固结构，包括由多片定子冲片单元叠压构成的定子单元，多个定子单元在圆周方向相互串接形成的圆环状定子铁芯，圆环状定子铁芯的内孔设置有支撑筒且两者构成固定连接，定子单元上开设有孔或槽，孔或槽的长度方向与圆环状定子铁芯的芯轴方向平行。
上述方案中，由于圆环状定子铁芯是由多个定子单元相互串接形成，整个圆环状定子铁芯装配后存在松动，在支撑筒的支撑作用下，各个定子单元均衡地呈放射性地往外移动，实现支撑筒涨紧定子单元的目的，孔或槽的设置一方面构成了内循环风路的一部分，优化了电机内部的冷却结构，另一方面也为将各个定子单元相互紧固连接的紧固件提供连接通道。
附图说明
图1为本发明实施例一的立体图；
图2为图1的主视图；
图3为图2的剖视图；
图4为图1的部分放大示意图；
图5为图1中紧固扣片的结构图；
图6为图1中支撑筒的剖视图；
图7为图1中定子单元的主视图；
图8为本发明实施例二中圆环状定子铁芯的主视图；
图9为图8的部分放大示意图；
图10为实施例二中支撑筒的主视图；
图11为图10的部分放大示意图；
图12为实施例二中圆环状定子铁芯与支撑筒的装配图；
图13为本发明实施例三中卡扣的主视图；
图14为图13的左视图。
具体实施方式
一种电机内定子的紧固结构，包括由多片定子冲片单元叠压构成的定子单元10，多个定子单元10在圆周方向相互串接形成的圆环状定子铁芯，圆环状定子铁芯的内孔设置有支撑筒20且两者构成固定连接，定子单元10上开设有孔11，孔11的长度方向与圆环状定子铁芯的芯轴方向平行。由于圆环状定子铁芯是由多个定子单元10相互串接形成，整个圆环状定子铁芯装配后存在松动，在支撑筒20的支撑作用下，各个定子单元10均衡地、呈放射性地往外移动，实现支撑筒20涨紧定子单元10的目的，孔11的设置一方面构成了内循环风路的一部分，优化了电机内部的冷却结构，另一方面也为将各个定子单元10相互紧固连接的紧固件提供约束连接部位。为了防止整个圆环状定子铁芯相对于圆环形支撑筒20周向及轴向位移，这里提供了以下五种关于紧固连接结构的实施例：
实施例一
如图1-图7所示，孔11内穿设有压紧定子单元10的紧固扣片30，螺栓40将紧固扣片30固定在支撑筒20上。利用定子单元10上原本设置的用来作为冷却结构的孔11来供紧固扣片30穿过，紧固扣片30穿过定子单元10上开设的孔11内，并压紧定子单元10，然后紧固扣片30的两端在通过螺栓40与支撑筒20固定连接，从而保证支撑筒20与定子单元10的可靠连接。
实施例二
如图8-图12所示，定子单元10的内圆面上设置有凸筋16，凸筋16的长度方向与定子单元10的轴向一致，支撑筒20的外圆面上与凸筋16对应位置处设置有凹槽22，凹槽22的长度方向与支撑筒20的轴向一致，凸筋16、凹槽22相互嵌合构成轴向、周向限位配合。由于定子单元10本身就是由多片定子冲片单元叠压构成的，其内圆面具有一定的粗糙度，正好利用这个特性限制定子单元10和支撑筒20在轴向上的位移，再加之凸筋16、凹槽22相互嵌合限制定子单元10和支撑筒20在圆周方向的位移，从而保证支撑筒20与定子单元10的可靠连接。
实施例三
孔11的两端设置有卡扣50，如图13-图14所示，卡扣50整体呈Z字型，包括相互平行的卡板51和连接板52，卡板51和连接板52之间由过渡台阶53相连，过渡台阶53垂直于卡板51和连接板52布置，卡板51置于孔11内且卡板51的板面上朝向孔11的壁上凸伸设置有卡接头511，卡接头511与孔11的壁上设置的卡槽构成卡接配合，过渡台阶53抵靠在定子单元10的端面上，连接板52与支撑筒20外壁贴合并通过螺栓固定连接。这种结构的卡扣50不需要穿过整个的孔11内部，只需设置在孔11的两端端部即可，卡板51通过卡接头511与孔11的壁连接、连接板52通过螺栓与支撑筒20外壁，限制圆环状定子铁芯相对于圆环形支撑筒20在周向上移动，然后过渡台阶53抵靠在定子单元10的端面上，限制圆环状定子铁芯相对于圆环形支撑筒20在轴向上移动，保证支撑筒20与定子单元10的可靠连接。
实施例四
也可以采用支撑筒20过盈镶嵌在圆环状定子铁芯内孔内并通过热套工艺连接为一体。
实施例五
进一步的，孔11内设置有铆钉，铆钉穿过定子单元10和支撑筒20将两者固定连接。
针对实施例一来说，所述的紧固扣片30整体呈几字形，中间片体31紧压在孔11的孔壁上，两端的端片32与支撑筒20的筒壁贴靠，端片32上开设有通孔321，螺栓40穿过通孔321与支撑筒20固定连接。支撑筒20涨紧定子单元10后，紧固扣片30将每个定子单元10固定在支撑筒20上，从而实现定子铁芯的紧固。
进一步的，紧固扣片30的中间片体31上设置有加强筋片33，加强筋片33的设置既增加了紧固扣片30的强度，也增大了定子铁芯和电机内部空气的接触面积，改善了电机内部的冷却循环；为了保证孔11为内循环风路的通畅性，加强筋片33垂直于中间片体31布置，且加强筋片33垂直于中间片体31布置，且加强筋片33的长度与中间片体31的长度一致，加强筋片33的宽度小于孔11的宽度。
为了使螺栓40能够与支撑筒20紧固连接，支撑筒20与圆环状定子铁芯同芯布置且支撑筒20的两端凸出于圆环状定子铁芯两端外部，凸出于外部的支撑筒20的两端的筒壁上开设有螺纹孔21，螺纹孔21与紧固扣片30的通孔321的位置一一对应布置。
进一步的，孔11设置在定子单元10径向方向上临近里端位置处，中间片体31的长度与孔11的长度一致，中间片体31与端片32之间的连接片34与定子单元10的端部贴靠。中间片体31紧压在孔或槽11的孔壁上，限制扇形定子单元10在径向的位移，连接片34与扇形定子单元10的端部贴靠限制扇形定子单元10在轴向的位移，最后再通过螺栓40将支撑筒20与紧固扣片30紧固连接，从而保证扇形定子单元10与支撑筒20连接的可靠性。
在实施例三中，卡接头511的截面为燕尾状，孔11的壁上设置的卡槽的截面也为燕尾状。装配时卡接头511从卡槽的端部滑入至过渡台阶53抵靠在定子单元10的端面位置停止，由于燕尾状卡接头511的悬置端的尺寸大于连接端的尺寸，卡接头511无法从卡槽中脱出，从而限制圆环状定子铁芯相对于圆环形支撑筒20在周向上移动，然后过渡台阶53抵靠在定子单元10的端面上，限制圆环状定子铁芯相对于圆环形支撑筒20在轴向上移动，保证支撑筒20与定子单元10的可靠连接。
为了便于进一步理解，这里对定子单元的结构作以下说明：定子单元10包括齿12，齿12在径向方向的外端设置有齿肩13、里端设置有轭部14，齿12两侧构成用于绕定子线圈的齿槽15，轭部14两侧分别设置有榫筋141及榫槽142，相邻的定子单元10通过榫筋、榫槽13、14相互镶嵌在一起。定子铁芯是由多个定子单元10相互镶嵌在一起构成的，相较于整圆来说材料利用率高，简化了冲片模具，有利于自动化大规模生产，同时这种串联的结构可以先在定子单元10上绕线，再组装成圆环状的定子铁芯，然后再将各定子单元10上线圈串接或并接，这样，在敞开的空间内绕线，工艺简单，定子槽口无需很大、槽满率高。

Claims (11)

  1. 一种电机内定子的紧固结构，其特征在于：包括由多片定子冲片单元叠压构成的定子单元（10），多个定子单元（10）在圆周方向相互串接形成的圆环状定子铁芯，圆环状定子铁芯的内孔设置有支撑筒（20）且两者构成固定连接，定子单元（10）上开设有孔（11），孔（11）的长度方向与圆环状定子铁芯的芯轴方向平行。
  2. 根据权利要求1所述的电机内定子的紧固结构，其特征在于：孔（11）内穿设有压紧定子单元（10）的紧固扣片（30），螺栓（40）将紧固扣片（30）固定在支撑筒（20）上。
  3. 根据权利要求1所述的电机内定子的紧固结构，其特征在于：定子单元（10）的内圆面上设置有凸筋（16），凸筋（16）的长度方向与定子单元（10）的轴向一致，支撑筒（20）的外圆面上与凸筋（16）对应位置处设置有凹槽（22），凹槽（22）的长度方向与支撑筒（20）的轴向一致，凸筋（16）、凹槽（22）相互嵌合构成轴向、周向限位配合。
  4. 根据权利要求1所述的电机内定子的紧固结构，其特征在于：孔（11）的两端设置有卡扣（50），卡扣（50）整体呈Z字型，包括相互平行的卡板（51）和连接板（52），卡板（51）和连接板（52）之间由过渡台阶（53）相连，过渡台阶（53）垂直于卡板（51）和连接板（52）布置，卡板（51）置于孔（11）内且卡板（51）的板面上朝向孔（11）的壁上凸伸设置有卡接头（511），卡接头（511）与孔（11）的壁上设置的卡槽构成卡接配合，过渡台阶（53）抵靠在定子单元（10）的端面上，连接板（52）与支撑筒（20）外壁贴合并通过螺栓固定连接。
  5. 根据权利要求1所述的电机内定子的紧固结构，其特征在于：支撑筒（20）过盈镶嵌在圆环状定子铁芯内孔内并通过热套工艺连接为一体。
  6. 根据权利要求1所述的电机内定子的紧固结构，其特征在于：孔（11）内设置有铆钉，铆钉穿过定子单元（10）和支撑筒（20）将两者固定连接。
  7. 根据权利要求2所述的电机内定子的紧固结构，其特征在于：所述的紧固扣片（30）整体呈几字形，中间片体（31）紧压在孔（11）的孔壁上，两端的端片（32）与支撑筒（20）的筒壁贴靠，端片（32）上开设有通孔（321），螺栓（40）穿过通孔（321）与支撑筒（20）固定连接。
  8. 根据权利要求7所述的电机内定子的紧固结构，其特征在于：紧固扣片（30）的中间片体（31）上设置有加强筋片（33），加强筋片（33）垂直于中间片体（31）布置，且加强筋片（33）垂直于中间片体（31）布置，且加强筋片（33）的长度与中间片体（31）的长度一致，加强筋片（33）的宽度小于孔（11）的宽度。
  9. 根据权利要8所述的电机内定子的紧固结构，其特征在于：支撑筒（20）与圆环状定子铁芯同芯布置且支撑筒（20）的两端凸出于圆环状定子铁芯两端外部，凸出于外部的支撑筒（20）的两端的筒壁上开设有螺纹孔（21），螺纹孔（21）与紧固扣片（30）的通孔（321）的位置一一对应布置。
  10. 根据权利要求8所述的电机内定子的紧固结构，其特征在于：孔（11）设置在定子单元（10）径向方向上临近里端位置处，中间片体（31）的长度与孔（11）的长度一致，中间片体（31）与端片（32）之间的连接片（34）与定子单元（10）的端部贴靠。
  11. 根据权利要求4所述的电机内定子的紧固结构，其特征在于：卡接头（511）的截面为燕尾状，孔（11）的壁上设置的卡槽的截面也为燕尾状。
PCT/CN2019/128248 2019-09-17 2019-12-25 电机内定子的紧固结构 WO2021051702A1 (zh)

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