CN220754503U - Motor structure - Google Patents

Abstract

The application relates to the technical field of motor manufacturing and provides a motor structure. The motor structure comprises a shell, a motor shaft and a plurality of rolling bodies; the motor shaft penetrates through the shell, and one of the motor shaft and the shell can rotate around the axis of the motor shaft relative to the other; an assembly cavity circumferentially arranged around the motor shaft is formed between the machine shell and the motor shaft, a plurality of rolling bodies are mounted in the assembly cavity and are arranged at intervals or adjacently along the circumferential direction of the motor shaft, and each rolling body can rotate in the assembly cavity. The motor structure provided by the application is equivalent to a structure that a bearing is directly integrated on a shell and/or a motor shaft to be rotated and supported instead of the bearing, so that the bearing assembly step is omitted, and the assembly difficulty is reduced. Meanwhile, only the assembly of a plurality of rolling bodies is considered, and more assembly space is not occupied on the shell and the motor shaft; besides, each rolling body can be made into a smaller size, and only the rolling bodies are required to be installed into the assembly cavity, so that the small-size requirement of the motor structure can be met.

Description

Motor structure

Technical Field

The application relates to the technical field of motor manufacturing, in particular to a motor structure.

Background

In the related art, no matter the motor is an inner rotor motor or an outer rotor motor, a bearing is required to be installed for rotation support during power output. However, when the motor size is reduced, the corresponding size of each structure is correspondingly reduced, which results in increased assembly difficulty and easy influence on coaxiality requirements.

Disclosure of Invention

Based on this, it is necessary to provide a motor structure, can satisfy the rotation support assembly when the small-size, reduces the assembly degree of difficulty, guarantees the axiality requirement.

A motor structure comprises a shell, a motor shaft and a plurality of rolling bodies; the motor shaft penetrates through the shell, and one of the motor shaft and the shell can rotate around the axis of the motor shaft relative to the other; an assembly cavity circumferentially arranged around the motor shaft is formed between the machine shell and the motor shaft, a plurality of rolling bodies are mounted in the assembly cavity and are circumferentially arranged at intervals or adjacently arranged along the motor shaft, and each rolling body can rotate in the assembly cavity.

It is understood that the assembly cavity circumferentially arranged along the motor shaft is arranged between the motor shaft and the housing and is matched with a plurality of rolling bodies circumferentially spaced or adjacently arranged along the motor shaft so as to meet the rotation support between the motor shaft and the housing and facilitate power transmission. The arrangement is equivalent to directly integrating a structure for replacing the bearing to rotate and support on the shell and/or the motor shaft, so that the bearing assembly step is omitted, and the assembly difficulty is reduced. Meanwhile, compared with the direct adoption of the bearing, only the assembly of a plurality of rolling bodies is needed to be considered, and more assembly space is not needed to be occupied on the shell and the motor shaft; besides, each rolling body can be made into a smaller size, and only the rolling bodies are required to be installed into the assembly cavity, so that the small-size requirement of the motor structure can be met. In addition, because the assembling cavity is directly formed between the shell and the motor shaft, the problem that the coaxiality is lower due to the fact that the bearing is directly adopted and the problem of processing is solved.

In some embodiments, the housing is configured with a through hole for the motor shaft to pass through, and at least one of a wall of the through hole and a side wall of the motor shaft is concavely provided with a groove to define the assembly cavity.

In some embodiments, the casing is configured with an assembling boss at the penetrating hole, the assembling boss extends along the axial direction of the motor shaft, the penetrating hole penetrates through the assembling boss, and the groove is formed in the assembling boss.

In some embodiments, the assembly cavity is configured as an annular space in a closed ring circumferentially arranged around the motor shaft, and a plurality of the rolling bodies are adjacently arranged in the assembly cavity along the circumferential direction of the motor shaft; or, the assembly cavity comprises a plurality of subchambers, each subchamber is arranged at intervals along the circumferential direction of the motor shaft, and at least one rolling body is installed in each subchamber.

In some embodiments, the assembly cavity is provided with first cavity walls which are oppositely arranged along the radial direction of the motor shaft, each first cavity wall is convexly provided with a curved surface groove, and two oppositely arranged curved surface grooves are matched with one rolling body.

In some of these embodiments, each of the rolling bodies is configured as a ball, and the curved groove is configured as a spherical groove; alternatively, each of the rolling bodies is configured as a roller shaft, an axial direction of each of the roller shafts is the same as an axial direction of the motor shaft, and the curved groove is configured as a curved groove.

In some of these embodiments, the assembly chamber has a first chamber wall disposed radially opposite the motor shaft, and the assembly chamber has a second chamber wall disposed axially opposite the motor shaft; the thickness of the first cavity wall at the machine shell along the radial direction of the motor shaft is different from the thickness of the second cavity wall at the machine shell along the axial direction of the motor shaft.

In some embodiments, the casing includes a first casing and a second casing fastened to the first casing, and the first casing and the second casing are both provided with the assembly cavity along an opposite end of the motor shaft in an axial direction.

In some embodiments, the first housing is provided with a first connecting arm along a radial direction of the motor shaft, and the second housing is provided with a second connecting arm along a radial direction of the motor shaft, and the first connecting arm is connected with the second connecting arm.

In some embodiments, the first connecting arm and the second connecting arm are both in an annular structure surrounding the circumference of the motor shaft, the first connecting arm is provided with a plurality of first connecting holes which are arranged at intervals around the axis of the motor shaft, the second connecting arm is provided with a plurality of second connecting holes which are arranged at intervals around the axis of the motor shaft, and the first connecting holes and the second connecting holes are in one-to-one correspondence; the motor structure further comprises a plurality of locking pieces, and each locking piece penetrates through the corresponding first connecting hole and the corresponding second connecting hole so as to lock the first connecting arm and the second connecting arm.

Drawings

In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings that are required to be used in the description of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic diagram of a motor structure according to an embodiment of the present disclosure;

fig. 2 is a partial enlarged view at a in fig. 1.

Reference numerals: 100. a motor structure; 10. a housing; 11. assembling a boss; 12. a first housing; 13. a second housing; 20. a motor shaft; 30. a rolling element; 40. a stator assembly; 101. penetrating holes; 110. an assembly chamber; 121. a first connecting arm; 131. a second connecting arm; 1101. a first cavity wall; 1102. a second chamber wall; 1103. a curved surface groove; 1211. a first connection hole; 1311. and a second connection hole.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used in the description of the present application for purposes of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact of the first feature with the second feature, or an indirect contact of the first feature with the second feature via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The term "and/or" as used in the specification of this application includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, an embodiment of the present application provides a motor structure 100, which can meet the rotation support in small size, reduce the assembly difficulty, and effectively ensure the coaxiality requirement. Specifically, the motor structure 100 includes a housing 10, a motor shaft 20 and a plurality of rolling elements 30, wherein the motor shaft 20 is disposed through the housing 10, and one of the motor shaft 20 and the housing 10 can rotate around an axis of the motor shaft 20 relative to the other. An assembly chamber 110 circumferentially arranged around the motor shaft 20 is constructed between the casing 10 and the motor shaft 20, a plurality of rolling bodies 30 are mounted in the assembly chamber 110 and are arranged at intervals or adjacently along the circumferential direction of the motor shaft 20, and each rolling body 30 can rotate in the assembly chamber 110.

Compared with the direct rotary support by adopting the bearing, only the assembly of a plurality of rolling bodies 30 is needed, and more assembly space is not needed to occupy on the shell 10 and the motor shaft 20; moreover, each rolling element 30 can be smaller in size, so that the corresponding assembly cavity 110 can be correspondingly reduced in size, and the small-size requirement of the motor structure 100 is met. Moreover, since the assembly cavity 110 is directly arranged between the housing 10 and the motor shaft 20, which is equivalent to a structure of directly and integrally assembling between the housing 10 and the motor shaft 20 to replace a bearing for rotation support, the bearing assembly step is omitted, the assembly difficulty is reduced, and the problem that the end face of the housing 10 is easy to deform when the bearing is pressed in is effectively solved. In addition, since the plurality of rolling bodies 30 are arranged around the axis of the motor shaft 20, the stress between the motor shaft 20 and the housing 10 is balanced to ensure the concentricity requirement; moreover, since the assembly cavity 110 is directly formed between the housing 10 and the motor shaft 20, the problem of low coaxiality due to the processing problem when the bearing is directly adopted is solved.

In actual use, the motor structure 100 employs an external rotor motor. Specifically, a stator assembly 40 and a rotor assembly are installed in the casing 10, the stator assembly 40 is connected with the motor shaft 20, and the rotor assembly is installed at the outer side of the stator assembly 40 and is connected with the casing 10. The motor shaft 20 mainly plays a supporting role, and the casing 10 rotates around the axis of the motor shaft 20 along with the rotor assembly to perform power output. At this time, the rotational support of the casing 10 with respect to the motor shaft 20 is satisfied by the fitting of the fitting chamber 110 with the plurality of rolling bodies 30, so as to ensure the power output stability. In an alternative embodiment, the motor structure 100 may also be an inner rotor motor, in which case the motor shaft 20 rotates relative to the housing 10. In any motor structure 100, it is sufficient to provide an assembly chamber 110 between the housing 10 and the motor shaft 20 for assembling the plurality of rolling elements 30, and to realize a rotation support.

Referring to fig. 1, for example, the assembly cavity 110 is an annular space which is circumferentially arranged around the motor shaft 20 and is in a closed loop, so that a plurality of rolling bodies 30 are located on the same circumference, and assembly concentricity is ensured. The number of rolling elements 30 is related to the size of the assembly cavity 110 and the size of the rolling elements 30 themselves. Any adjacent two rolling bodies 30 are in clearance fit or only contact, so as to ensure that each rolling body 30 can rotate. In the axial direction of the motor shaft 20, a projection area corresponding to an area surrounded by the plurality of rolling elements 30 is substantially the same as a projection area corresponding to the fitting chamber 110.

In an alternative embodiment, the assembly chamber 110 includes a plurality of subchambers, each of which is spaced apart along the circumference of the motor shaft 20, with one rolling element 30 mounted within each subchamber. In this way, a plurality of intermittent rotation support points are formed between the motor shaft 20 and the housing 10, and the plurality of rotation support points are located on the same circumference to ensure concentricity requirement. Each rolling element 30 is rotatable within a corresponding subchamber to satisfy the rotational support.

In other embodiments, more than two rolling elements 30 may be mounted in each sub-cavity, and the projection of each sub-cavity along the motor shaft 20 may be arc-shaped. By means of the arrangement, the number of the subcavities can be reduced, and the strength of each structure can be ensured on the basis of meeting the requirement of rotating support.

Referring to fig. 1 and 2, in an alternative embodiment, the assembly cavity 110 has first cavity walls 1101 disposed opposite to each other along the radial direction of the motor shaft 20, each first cavity wall 1101 is concavely provided with a curved slot 1103, and two oppositely disposed curved slots 1103 are adapted to one rolling element 30, so as to meet the rotation requirement of the rolling element 30. One of the first chamber walls 1101 is located in the housing 10 and the other first chamber wall 1101 is located in the motor shaft 20. On the one hand, the curved surface grooves 1103 are utilized to promote the radial dimension of the assembly cavity 110 along the motor shaft 20 to be smaller than the dimension of each rolling body 30, so that each rolling body 30 is more conveniently constrained in the assembly cavity 110, and the rolling stability of each rolling body 30 is improved; on the other hand, the rolling stability of each rolling element 30 is further improved by using two curved grooves 1103 arranged opposite to each other to restrict the position of each rolling element 30.

Further, each rolling element 30 is configured as a ball, and the curved groove 1103 is configured as a spherical groove. The spherical grooves are adapted to the balls so that the balls can rotate more smoothly in the assembly cavity 110.

In an alternative embodiment, each rolling body 30 is configured as a roller shaft, and the axial direction of each roller shaft is the same as the axial direction of the motor shaft 20, and the curved groove 1103 is configured as a curved groove. The cambered surface groove is matched with the peripheral wall of the roll shaft so as to ensure smooth rotation of each roll shaft. Of course, in another alternative embodiment, curved grooves 1103 may not be provided on the two first chamber walls 1101, and the rolling elements 30 may be in point contact with the first chamber walls 1101. As long as it achieves stable rotation of the rolling elements 30.

As shown in fig. 1 and 2, in actual use, the assembly chamber 110 has a second chamber wall 1102 disposed opposite to each other along the axial direction of the motor shaft 20, and the thickness of the second chamber wall 1102 along the axial direction of the motor shaft 20 at the housing 10 is different from the thickness of the first chamber wall 1101 along the radial direction of the motor shaft 20 at the housing 10. In this case, two groove walls of the groove along the axial direction of the motor shaft 20 are taken as the second cavity wall 1102, and a groove wall of the groove along the radial direction of the motor shaft 20 is taken as the first cavity wall 1101, so that the assembly cavity 110 is defined by the groove provided on the housing 10.

It will be appreciated that the load experienced may vary due to the different manner in which the motor structure 100 is mounted. Thus, when the respective thicknesses of the first chamber wall 1101 in the radial direction and the second chamber wall 1102 in the axial direction are different, the corresponding fitting manner can be selected according to different loads. For example, when subjected primarily to axial loads, the corresponding thickness of the second chamber wall 1102 may be increased; when subjected primarily to radial loads, the corresponding thickness of the first chamber wall 1101 may be increased. The device mainly can meet different loads so as to ensure effective rotation support. Wherein, the dimension between the two second chamber walls 1102 is larger than the dimension of the rolling bodies 30 along the axial direction of the motor shaft 20.

In some particular embodiments, the thickness of the first chamber wall 1101 in the radial direction of the motor is greater than the thickness of the second chamber wall 1102 in the radial direction of the motor shaft 20. Such an arrangement may be used for power take-off when the motor structure 100 is required to withstand axial loads.

As shown in fig. 1 and 2, in an alternative embodiment, the housing 10 is configured with a through hole 101 for the motor shaft 20 to pass through, and at least one of the wall of the through hole 101 and the side wall of the motor shaft 20 is concavely provided with a groove to define the assembly cavity 110. That is, the fitting chamber 110 is provided between the wall of the penetration hole 101 and the motor shaft 20. And, with the arrangement of the grooves, the processing and the manufacturing are facilitated, so that the assembly with a plurality of rolling bodies 30 is facilitated.

Further, the casing 10 is configured with an assembling boss 11 at the through hole 101, the assembling boss 11 extends along the axial direction of the motor shaft 20, the through hole 101 penetrates the assembling boss 11, and the groove is formed in the assembling boss 11. It will be appreciated that by arranging the mounting boss 11, it is equivalent to reserving a position on the casing 10 where a groove is specially provided, so as to ensure the wall thickness of the groove. Wherein the assembling boss 11 may be provided at an end of the casing 10 facing the rotor assembly. Specifically, the assembly protrusion protrudes inwards along the axial direction of the motor shaft 20 from the inner end surface of the casing 10; and, the fitting projection is an annular projection to be fitted with the motor shaft 20. The groove is arranged on one side of the assembly protrusion facing the motor shaft 20, and the notch of the groove faces the motor shaft 20, so that a plurality of rolling bodies 30 are arranged between the assembly protrusion and the motor shaft 20, and the rotary support of the machine shell 10 and the motor shaft 20 is realized. In actual use, the two ends of the casing 10 along the axial direction of the motor shaft 20 are respectively provided with an assembling boss 11, and each assembling boss 11 is provided with a groove, so that the two ends of the casing 10 are respectively provided with an assembling cavity 110 to meet the rotation support of the two ends.

In an alternative embodiment, the mounting boss 11 may also be located outside the housing 10, i.e., protruding axially outward from the outer end surface of the housing 10 along the motor shaft 20. Of course, a part of the mounting boss 11 may be located outside the casing 10 and a part may be located inside the casing 10. Meanwhile, the mounting boss 11 may be provided only at one end of the housing 10 in the axial direction of the motor shaft 20, and the other end may satisfy the arrangement of the mounting cavity 110 by increasing the wall thickness of the housing 10. The installation of the assembly cavity 110 and the assembly of the plurality of rolling elements 30 can be realized, and the specific installation situation can be adjusted according to the actual requirement, which is only illustrated here.

In alternative embodiments, grooves may also be provided on the motor shaft 20; alternatively, grooves are provided on both the motor shaft 20 and the housing 10, and the notches of the two grooves are disposed opposite to each other so as to jointly enclose the fitting chamber 110 for mounting the rolling elements 30. Of course, only the recess may be provided on the housing 10 in consideration of the rigidity requirement of the motor shaft 20.

With continued reference to fig. 1, in an alternative embodiment, the housing 10 includes a first housing 12 and a second housing 13 fastened to the first housing 12; and, the first housing 12 and the second housing 13 are each provided with an assembly cavity 110 at opposite ends in the axial direction of the motor shaft 20. That is, the casing 10 in the present embodiment is assembled in a split manner, improving the convenience of assembly. In actual use, the motor shaft 20 may be connected to the corresponding stator assembly 40; one of the first housing 12 and the second housing 13 is then assembled with respect to the motor shaft 20, and the other is assembled with respect to the motor shaft 20; finally, the first housing 12 and the second housing 13 are connected; thus, the assembling operation can be realized.

The first casing 12 and the second casing 13 are both in cylindrical structures, and end surfaces thereof are abutted and fixed to assemble the complete casing 10. To further facilitate the connection of the first housing 12 and the second housing 13 and to reduce the effect of connection stresses on the rotor assembly within the housing 10. In some embodiments, the first housing 12 and the second housing 13 are each provided with a protruding connecting arm along the radial direction of the motor shaft 20, which is a first connecting arm 121 and a second connecting arm 131, respectively, which are press-fitted. The first housing 12 and the second housing 13 may be assembled by bolting or welding as long as the fixation of the first connecting arm 121 and the second connecting arm 131 is satisfied.

Further, in view of the sealing property requirement, a sealing ring or gasket may be pressed between the first and second connection arms 121 and 131. When a seal ring is employed, at least one of the first and second connection arms 121, 131 is configured with a seal groove to constrain the seal ring within the seal groove; then, the sealing ring is forced to deform by the compression of the first connecting arm 121 and the second connecting arm 131, so that sealing is realized.

With continued reference to fig. 1, in some embodiments, the first and second connecting arms 121, 131 are each configured as an annular structure that surrounds the circumference of the motor shaft 20. That is, a closed ring-shaped connection position is formed in the circumferential direction of the casing 10, improving the tightness and sealing. Further, first connection holes 1211 are provided through the thickness of the first connection arm 121, second connection holes 1311 are provided through the thickness of the second connection arm 131, and the number of the first connection holes 1211 and the number of the second connection holes 1311 are plural and are arranged at intervals around the axis of the motor shaft 20, and each first connection hole 1211 corresponds to one second connection hole 1311. At this time, the motor structure 100 further includes a plurality of locking members, each of which may be penetrated through the corresponding first and second coupling holes 1211 and 1311 to lock the first and second coupling arms 121 and 131.

Each locking piece can be a screw or a bolt and nut matched. As long as the fixation of the first connecting arm 121 and the second connecting arm 131 can be satisfied.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of the present application is to be determined by the following claims.

Claims (10)

1. A motor structure, characterized in that the motor structure (100) comprises a housing (10), a motor shaft (20) and a plurality of rolling bodies (30);

the motor shaft (20) penetrates through the shell (10), and one of the motor shaft (20) and the shell (10) can rotate around the axis of the motor shaft (20) relative to the other; an assembly cavity (110) circumferentially arranged around the motor shaft (20) is formed between the machine shell (10) and the motor shaft (20), a plurality of rolling bodies (30) are mounted in the assembly cavity (110) and are circumferentially arranged at intervals or adjacently arranged along the motor shaft (20), and each rolling body (30) can rotate in the assembly cavity (110).

2. The motor structure according to claim 1, characterized in that the housing (10) is configured with a penetration hole (101) for penetration of the motor shaft (20), at least one of a wall of the penetration hole (101) and a side wall of the motor shaft (20) being concavely provided with a groove to define the fitting chamber (110).

3. The motor structure according to claim 2, characterized in that the housing (10) is configured with an assembly boss (11) at the through hole (101), the assembly boss (11) extends along the axial direction of the motor shaft (20), the through hole (101) penetrates the assembly boss (11), and the groove is provided in the assembly boss (11).

4. The motor structure according to claim 1, characterized in that the fitting chamber (110) is configured as an annular space in a closed ring circumferentially arranged around the motor shaft (20), a plurality of the rolling bodies (30) being adjacently arranged to the fitting chamber (110) along the circumferential direction of the motor shaft (20); or alternatively

The assembly cavity (110) comprises a plurality of subchambers, each subchamber is arranged at intervals along the circumferential direction of the motor shaft (20), and at least one rolling body (30) is arranged in each subchamber.

5. The motor structure according to claim 1, characterized in that the assembly chamber (110) has first chamber walls (1101) disposed radially opposite to each other along the motor shaft (20), each of the first chamber walls (1101) being provided with curved grooves (1103) protruding therefrom, both of the curved grooves (1103) being disposed opposite to each other to be fitted to one of the rolling elements (30).

6. The motor structure according to claim 5, characterized in that each of the rolling bodies (30) is configured as a ball, and the curved groove (1103) is configured as a spherical groove; or alternatively

Each of the rolling bodies (30) is configured as a roller shaft, the axial direction of each roller shaft is the same as the axial direction of the motor shaft (20), and the curved surface groove (1103) is configured as a curved surface groove.

7. The motor structure according to claim 1, characterized in that the assembly chamber (110) has a first chamber wall (1101) arranged diametrically opposite along the motor shaft (20), the assembly chamber (110) having a second chamber wall (1102) arranged axially opposite along the motor shaft (20);

the thickness of the first cavity wall (1101) at the housing (10) along the radial direction of the motor shaft (20) is different from the thickness of the second cavity wall (1102) at the housing (10) along the axial direction of the motor shaft (20).

8. The motor structure according to any one of claims 1 to 7, characterized in that the housing (10) includes a first housing (12) and a second housing (13) fastened to the first housing (12), and the first housing (12) and the second housing (13) are each provided with the fitting chamber (110) at opposite ends in an axial direction of the motor shaft (20).

9. The motor structure according to claim 8, characterized in that the first housing (12) is provided with a first connecting arm (121) protruding in a radial direction of the motor shaft (20), the second housing (13) is provided with a second connecting arm (131) protruding in a radial direction of the motor shaft (20), and the first connecting arm (121) and the second connecting arm (131) are connected.

10. The motor structure according to claim 9, characterized in that the first connecting arm (121) and the second connecting arm (131) are each in an annular structure surrounding a motor shaft (20), the first connecting arm (121) is configured with a plurality of first connecting holes (1211) arranged at intervals around an axis of the motor shaft (20), the second connecting arm (131) is configured with a plurality of second connecting holes (1311) arranged at intervals around the axis of the motor shaft (20), and the first connecting holes (1211) and the second connecting holes (1311) are in one-to-one correspondence;

the motor structure (100) further comprises a plurality of locking pieces, and each locking piece is arranged through the corresponding first connecting hole (1211) and the corresponding second connecting hole (1311) in a penetrating mode so as to lock the first connecting arm (121) and the second connecting arm (131).