Encoder and encoder support

Abstract

The utility model discloses an encoder and an encoder support, the encoder support comprises a side wall and a splicing block, the inside of the side wall is provided with an accommodating cavity used for accommodating an encoder rotor, the peripheral side of the side wall is provided with a splicing gap, and the splicing gap penetrates through the inner side and the outer side of the side wall along the radial direction of the side wall. The first end of the side wall in the axial direction is used for installing a circuit board, and the second end of the side wall in the axial direction is used for being fixedly connected with a motor stator. And the splicing blocks are detachably mounted on the splicing gaps. A user can extend into the accommodating cavity from the splicing gap on the side wall by means of a locking tool to fix the encoder rotor on the motor rotating shaft, and the splicing block is mounted at the splicing gap after the encoder rotor is fixed, so that foreign matters can be prevented from entering and polluting the encoder rotor in the accommodating cavity, and the accuracy of the detection result of the encoder is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of encoders, and in particular to an encoder and an encoder bracket. BACKGROUND

[0002] An encoder is a device used to feed back the position information of the output shaft of a servo motor. The encoder is installed in the motor process, the bracket is first fixed on the rear end cover of the motor, and then the encoder rotor is placed in the accommodating cavity of the bracket. The side of the bracket is provided with a through hole. After the encoder rotor is positioned by a positioning jig, a tool enters through the through hole to fix the encoder rotor on the motor shaft.

[0003] However, the through hole formed on the bracket is easy to cause foreign matter to enter the inside of the bracket and pollute the encoder rotor, thereby affecting the accuracy of the detection result. SUMMARY

[0004] The present application aims to provide an encoder and an encoder bracket to avoid polluting the encoder rotor and improve the accuracy of the detection result.

[0005] The present application provides an encoder bracket, which comprises:

[0006] a side wall, an inside of the side wall having an accommodating cavity, the accommodating cavity being used to accommodate an encoder rotor, a circumferential side of the side wall being provided with a splicing gap, the splicing gap penetrating the inside and the outside of the side wall along the radial direction of the side wall, a first end of the axial direction of the side wall being used to install a circuit board, and a second end of the axial direction of the side wall being used to be fixedly connected with a motor stator;

[0007] a splicing block, the splicing block being detachably installed on the splicing gap.

[0008] In an embodiment, the side wall is provided with a limiting structure on at least one side of the circumferential direction of the splicing gap, and the splicing block is further provided with a limiting part, the limiting structure and the limiting part being matched to limit the position of the radial direction where the splicing block is installed.

[0009] In an embodiment, the position of the radial direction where the splicing block is installed is the position corresponding to the situation that the outer side surface of the splicing block is flush with the outer side surface of the side wall.

[0010] In an embodiment, the limiting structure is a clamping groove provided on the side wall of the splicing gap, and the limiting part comprises an accommodating groove formed on the outer side surface of the splicing block and an elastic buckle fixed at one end of the inner wall of the accommodating groove, the elastic buckle and the clamping groove being matched to realize the installation of the splicing block.

[0011] In an embodiment, the elastic buckle is provided with a slot on a side surface close to the slot opening of the accommodating groove, for inserting a tool to dismount the elastic buckle from the clamping groove.

[0012] In an embodiment, the limiting structure is a threaded hole provided on the side wall on at least one side of the axial direction of the splicing gap, the threaded hole penetrating the side wall from the radial direction, the limiting part is a mounting hole provided on the splicing block, the mounting hole penetrating the splicing block from the radial direction, the mounting hole and the threaded hole are in position correspondence, so that one end of a screw passes through and is fixedly connected with the threaded hole.

[0013] In an embodiment, the limiting structure is a first half threaded hole provided on the splicing gap, the first half threaded hole penetrating the side wall from the radial direction, the limiting part is a second half threaded hole provided on the splicing block in the circumferential direction, the second half threaded hole penetrating the splicing block from the radial direction, the first half threaded hole and the second half threaded hole are in position correspondence, so as to be fixed by screwing a screw.

[0014] In an embodiment, the splicing gap penetrates both ends of the axial direction of the side wall.

[0015] In an embodiment, the circumferential outer side of the side wall is further provided with a connecting lug, the connecting lug protruding outward from the radial direction of the side wall, the connecting lug being used for fixedly connecting with a motor stator.

[0016] The application provides an encoder, comprising the encoder support, further comprising an encoder rotor and a circuit board, the encoder rotor being accommodated in the accommodating cavity and being fixedly connected with a motor rotating shaft, and the circuit board being installed at the first end of the axial direction of the side wall.

[0017] According to the encoder and the encoder support of the above-mentioned embodiments, the user can fix the encoder rotor on the motor rotating shaft by inserting a locking tool into the accommodating cavity through the splicing gap on the side wall, and install the splicing block at the splicing gap after fixing the encoder rotor, so as to avoid foreign matters from entering and polluting the encoder rotor in the accommodating cavity, and further improve the accuracy of the detection result of the encoder. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a perspective view of the encoder support provided by the application in the first embodiment;

[0019] Figure 2 FIG. 2 is an exploded view of the encoder support provided by the application in the first embodiment;

[0020] Figure 3 FIG. 3 is a perspective view of the side wall of the encoder support provided by the application in the first embodiment;

[0021] Figure 4 The encoder bracket provided by the present application is in the first embodiment of the assembled block Figure 1 ;

[0022] Figure 5 The encoder bracket provided by the present application is in the first embodiment of the assembled block Figure 2 ;

[0023] Figure 6 The encoder bracket provided by the present application is in the second embodiment of the assembled block

[0024] Figure 7 The encoder bracket provided by the present application is in the second embodiment of the assembled block

[0025] Figure 8 The encoder bracket provided by the present application is in the second embodiment of the assembled block

[0026] Figure 9 The encoder bracket provided by the present application is in the third embodiment of the assembled block

[0027] Figure 10 The encoder bracket provided by the present application is in the third embodiment of the assembled block

[0028] Figure 11 The encoder bracket provided by the present application is in the third embodiment of the assembled block

[0029] Reference signs:

[0030] Side enclosure 10, first end 101, second end 102, accommodating cavity 110, splicing gap 11, side wall 12, limiting structure 13, limiting block 131, clamping groove 14, threaded hole 15, first half threaded hole 16, connecting lug 17, assembled block 20, limiting part 21, limiting gap 210, accommodating groove 211, elastic buckle 212, insertion slot 213, mounting hole 22, second half threaded hole 23, first bolt fastener 30, second bolt fastener 40, circuit board 100. DETAILED DESCRIPTION

[0031] The application will be described in further detail below with specific reference being made to the drawings. Like elements are referenced with like numerals throughout the specification and figures. Many of the details of the application can be substituted by other elements, materials, methods, etc. without departing from the scope of the application. In some instances, certain operations have not been shown or described in the specification in order to avoid obscuring the application. Such operations will nevertheless be readily discernible by one skilled in the art of the application, in light of the detailed description herein and the associated drawings.

[0032] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments, and the operation steps involved in each embodiment can be sequentially adjusted or modified in a manner that is apparent to those skilled in the art. Therefore, the specification and drawings are only for the purpose of clearly describing one embodiment, and do not mean that the composition and / or order is necessary.

[0033] In this paper, the serial number of the components, such as "first", "second", etc., is only used to distinguish the described objects, and has no technical meaning. The "connection" and "coupling" in this application include direct and indirect connection (coupling) unless otherwise specified.

[0034] In the related art, for example, an optical encoder includes a stator and a rotor. The stator includes a bracket and a circuit board fixed to the bracket. The rotor includes a code disc holder and a code disc fixed to the code disc holder. The side of the code disc holder is provided with at least two top screw holes. The bracket side is provided with a through hole corresponding to the position of the top screw hole. During installation, the bracket is first fixedly arranged on the rear end cover of the motor. Then, the position of the code disc holder is positioned by means of a positioning tool. The top screw is screwed into the top screw hole from the through hole of the bracket to the end of the top shaft by using a screwdriver. Thus, the code disc holder is fixed to the motor shaft. The code disc can rotate synchronously with the motor shaft. The photoelectric sensor provided on the circuit board can sense the rotation of the code disc holder to obtain the motor position information.

[0035] However, the through hole provided on the bracket is easy to cause foreign matter to enter the inside of the bracket, which pollutes the code disc and affects the accuracy of the photoelectric sensor sensing.

[0036] In view of the above problems, the application provides an encoder and an encoder support, the support is provided in a split structure of a side wall and a block, after the encoder rotor and the motor rotating shaft are fixed through the splicing gap on the side wall, the block is installed at the splicing gap, foreign matters can be avoided from entering the inside of the support to contaminate the encoder rotor, and the accuracy of the detection result of the encoder can be improved. Embodiment one

[0037] Referring to Figures 1-11 The encoder support provided by the embodiment includes a side wall 10 and a block 20.

[0038] The inside of the side wall 10 has a containing cavity 110, which is used for containing an encoder rotor, which is fixedly connected with a motor rotating shaft. The side wall 10 is provided with a splicing gap 11 on the circumferential side, the splicing gap 11 penetrates the inside and the outside of the side wall 10 along the radial direction of the side wall 10, wherein the side wall 10 can be understood as a ring structure, the inside of the side wall 10 is the inner ring of the side wall 10 of the ring structure, the outside of the side wall 10 is the outer ring of the side wall 10 of the ring structure, and the splicing gap 11 provided on the circumferential side of the ring structure 10 penetrates the inside and the outside of the side wall 10 in the radial direction and communicates with the containing cavity 110, so as to facilitate the encoder rotor to be fixed on the motor rotating shaft by means of a tool.

[0039] The two ends of the side wall 10 along the axial direction are a first end 101 and a second end 102, respectively, the first end 101 of the side wall 10 along the axial direction is used for installing a circuit board 100, and the second end 102 of the side wall 10 along the axial direction is used for fixedly connecting with a motor stator. Wherein, the axial direction of the side wall 10 is perpendicular to the radial direction of the side wall 10, and the circuit board 100 installed at the first end 101 of the side wall 10 along the axial direction is usually provided with a sensor.

[0040] The block 20 is detachably installed on the splicing gap 11, so that the side wall 10, the block 20, the circuit board 100 and the motor stator are enclosed to form a complete containing cavity 110.

[0041] For example, taking an optical encoder as an example, the encoder rotor is composed of a code disc holder and a code disc fixed on the code disc holder, the code disc holder has a shaft hole, at least two locking holes (such as threaded holes) penetrating the shaft hole are arranged on the side surface of the code disc holder, after the side wall 10 is fixed to the motor, the code disc holder is sleeved on the motor rotating shaft through the shaft hole, the locking tool (such as a screwdriver) is inserted into the containing cavity 110 inside the encoder support through the splicing gap 11 on the side wall 10, and the locking piece (such as a jack) is screwed in the locking hole, so that the code disc holder is fixed on the motor rotating shaft by the friction between the locking piece and the motor rotating shaft. The motor works and drives the code disc holder to rotate synchronously through the motor rotating shaft, and the sensor senses the rotation of the code disc holder to obtain the position information of the motor.

[0042] In the present application, the user can enter the accommodating cavity 110 from the splicing gap 11 on the side wall 10 by means of a locking tool to fix the encoder rotor (code disc support) on the motor rotating shaft, and after fixing the encoder rotor, the block 20 is installed at the splicing gap 11, which can prevent foreign matters from entering and polluting the encoder rotor in the accommodating cavity 110, and further improve the accuracy of the detection result.

[0043] Referring to Figure 2 , Figure 3 , Figure 8 and Figure 11 , the splicing gap 11 penetrates the first end 101 and the second end 102 of the side wall 10 in the axial direction, leaving more space for the locking tool to enter, improving the installation efficiency of the encoder rotor.

[0044] Of course, in other embodiments, the splicing gap 11 is only a gap structure formed on the side wall 10, and of course, the gap structure needs to be arranged to facilitate the fixing of the code disc support on the motor rotating shaft by means of a tool. The structure of the splicing gap 11 can be selected according to actual needs.

[0045] After the block 20 is installed at the splicing gap 11, the block 20 has the possibility of moving in the radial direction of the side wall 10, in order to ensure that the block 20 can be limited at the splicing gap 11, referring to Figure 2 , Figure 3 , Figure 7 , Figure 8 and Figure 10 and Figure 11 , the side wall 10 is provided with a limiting structure 13 on at least one side of the circumference of the splicing gap 11, referring to Figure 4 , the block 20 is also provided with a limiting portion 21, and the limiting structure 13 cooperates with the limiting portion 21 to limit the position of the block 20 in the radial direction after installation, which is the position of the block 20 in the radial direction of the side wall 10 towards the inner ring of the side wall 10.

[0046] When installing the block 20 at the splicing gap 11 of the side wall 10, in order to ensure that the block 20 is flush with the outer surface of the side wall 10 to make the encoder support more beautiful, in the present embodiment, the position of the block 20 in the radial direction after installation is the position corresponding to the outer side surface of the block 20 flush with the outer side surface of the side wall 10, so that the outer side surface of the block 20 can be flush with the outer side surface of the side wall 10, further improving the sealing effect and reducing the overall size of the encoder.

[0047] It should be noted that the outer side surface of the side wall 10 is the outer ring surface of the annular structure side wall 10, and the outer side surface of the block 20 is the side surface of the block 20 facing away from the accommodating cavity 110 after the block 20 is installed at the splicing gap 11.

[0048] In one embodiment of the present application, as shown in Figure 3 , Figure 7 , Figure 8 , Figure 10 and Figure 11 , a limiting block 131 is further arranged on the side wall 12 of the splicing gap 11, wherein the side wall 12 of the splicing gap 11 is the side wall in the circumferential direction of the splicing gap 11, and the limiting block 131 is arranged on the side wall 12 in a protruding manner, as shown in Figure 4 , a limiting gap 210 is further arranged on the side wall of the splicing block 20 for cooperating with the limiting block 131, and through the cooperation between the limiting block 131 and the limiting gap 210, the limiting block 131 can form a blocking function to the splicing block 20, so as to further limit the splicing block 20 at the splicing gap 11, and the position of the splicing block 20 in the radial direction after installation is the position corresponding to the situation that the outer side surface of the splicing block 20 is flush with the outer side surface of the side wall 10.

[0049] Of course, the limiting block 131 can also be arranged on the side wall of the splicing block 20, and the limiting gap 210 can be arranged on the side wall 12 at the splicing gap 11 of the side wall 10 or the outer side of the side wall 10, and the specific selection can be made according to the actual needs, which is not limited here.

[0050] As shown in Figure 3 , the limiting structure 13 is a clamping groove 14 arranged on the side wall 12 of the splicing gap 11, as shown in Figure 2 and Figure 4 , the limiting part 21 includes a receiving groove 211 and an elastic buckle 212, wherein the receiving groove 211 is formed by recessing inwardly from the outer side surface of the splicing block 20, and one end of the elastic buckle 212 is fixed to the inner wall of the receiving groove 211, and the elastic buckle 212 cooperates with the clamping groove 14 to realize the installation of the splicing block 20.

[0051] In a specific embodiment, the elastic buckle 212 can be clamped in the clamping groove 14 to fix the splicing block 20 at the splicing gap 11. At least part of the elastic buckle 212 is exposed to the receiving groove 211, and in the process of installing the splicing block 20 at the splicing gap 11, the part of the elastic buckle 212 exposed to the receiving groove 211 is deformed by the extrusion of the side wall 12 of the splicing gap 11 and is retracted into the receiving groove 211, and when moving to the position of the clamping groove 14, the elastic buckle 212 is reset and clamped in the clamping groove 14, so that the elastic buckle 212 is clamped in the clamping groove 14.

[0052] As shown in Figure 5As shown, in order to facilitate the disassembly of the block 20, an insertion slot 213 is formed on the side surface of the elastic buckle 212 close to the accommodating groove 211. The insertion slot 213 is used for inserting a disassembly tool, so that the elastic buckle 212 is disassembled from the clamping groove 14 by means of the disassembly tool, and then the block 20 can be disassembled.

[0053] The elastic buckle 212 and the clamping groove 14 are clamped in a common clamping connection mode, that is, the elastic buckle 212 is retracted under stress deformation, and after reset, it can be clamped in the clamping groove 14. The disassembly tool can be a screwdriver. By inserting the screwdriver into the insertion slot 213, an acting force is applied to the elastic buckle 212 to make it deform and retract into the accommodating groove 211, so that the block 20 can be disassembled from the splicing gap 11.

[0054] As shown in Figures 1-3 , and Figures 6-11 As shown, the circumferential outer side of the side wall 10 is also provided with a connecting lug 17 which protrudes outward in the radial direction of the side wall 10. The connecting lug 17 is used for fixedly connecting with the motor stator, so as to fix the encoder support on the motor stator.

[0055] In a specific embodiment, the connecting lug 17 is fixedly connected with the motor stator, so that the encoder support formed by the side wall 10 and the block 20 and the rear end cover of the motor and the circuit board 100 close the accommodating cavity 110 to form a sealed cavity, thereby preventing foreign matters from entering the inside of the accommodating cavity 110. Embodiment two

[0056] The embodiment provides an encoder support, which is different from the embodiment one in the connection mode of the block 20 and the splicing gap 11 on the side wall 10. For details, please refer to the following embodiment.

[0057] As shown in Figures 6-8 The limiting structure 13 is a threaded hole 15 arranged on at least one side wall 12 of the side wall 11 located in the circumferential direction of the splicing gap 11. The threaded hole 15 penetrates the side wall 10 in the radial direction. The limiting portion 21 is an installation hole 22 arranged on the block 20. The installation hole 22 penetrates the block 20 in the radial direction. The installation hole 22 corresponds in position to the threaded hole 15, so that one end of a screw passes through the installation hole 22 and is fixedly connected with the threaded hole 15, thereby fixing the block 20 at the position of the splicing gap 11.

[0058] As shown in Figures 6-8 In order to facilitate the distinction, the screw passing through the installation hole 22 is defined as a first bolt fastener 30. After the first bolt fastener 30 passes through the installation hole 22, it is screwed into the threaded hole 15.

[0059] In a specific embodiment, after the tile 20 is installed at the joint gap 11, the position of the installation hole 22 corresponds to the position of the threaded hole 15, and after the first bolt fastener 30 is screwed through the installation hole 22 and screwed into the threaded hole 15, the tile 20 is installed at the gap 11 in a detachable manner.

[0060] In the embodiment, the first bolt fastener 30 can be a common fastening bolt which can be tightened in the threaded hole 15 by means of a hexagon socket, a screwdriver or the like.

[0061] In an embodiment, the limiting block 131 is a structure protruding from the side wall 12, and the threaded hole 15 can be arranged on the limiting block 131. Embodiment Three

[0062] The embodiment provides an encoder bracket, which is different from the encoder brackets in the embodiments one and two in the connection manner of the tile 20 and the joint gap 11 on the side wall 10, and specific reference can be made to the following embodiments.

[0063] Referring to Figures 9-11 As shown in the figure, the limiting structure 13 is a first half threaded hole 16 arranged on the side wall 12 of the joint gap 11, and the first half threaded hole 16 penetrates the side wall 10 from the radial direction, the limiting block 21 is a second half threaded hole 23 arranged on the circumferential end face of the tile 20, and the second half threaded hole 23 penetrates the tile 20 from the radial direction, and after the tile 20 is installed at the joint gap 11, the position of the first half threaded hole 16 corresponds to the position of the second half threaded hole 23, so that the tile 20 and the side wall 10 are connected by screwing.

[0064] For the convenience of distinction, the screw screwed in the first half threaded hole 16 and the second half threaded hole 23 in the position corresponding to each other is defined as a second bolt fastener 40. In the embodiment, the first half threaded hole 16 and the second half threaded hole 23 corresponding to each other can form a complete threaded hole, and the second bolt fastener 40 is screwed in the threaded hole, forming a function similar to a pin shaft, that is, the tile 20 and the side wall 10 are connected.

[0065] In the embodiment, the second bolt fastener 40 is a top screw (also known as a machine screw), which can ensure the flatness of the surface of the side wall 10 and the tile 20. Of course, in other embodiments, a bolt or the like can also be used to fix and connect the tile 20 and the side wall 10. Embodiment

[0066] The embodiment provides an encoder, which comprises the encoder bracket in the above-mentioned embodiments one to three, and further comprises an encoder rotor, which is accommodated in the accommodating cavity 110 and is fixedly connected with the motor rotating shaft.

[0067] For the specific structure and features of the encoder bracket, reference can be made to the above-mentioned embodiments one to three, and no further description is given here.

[0068] In summary, in the encoder and the encoder bracket provided by the application, the user can fix the encoder rotor on the motor rotating shaft by means of the locking tool from the splicing gap on the side wall into the accommodating cavity, and install the splicing block to the splicing gap after fixing the encoder rotor, so that foreign matters can be avoided from entering and polluting the encoder rotor in the accommodating cavity, and the accuracy of the detection result of the encoder is further improved.

[0069] The above describes the present application by using specific examples, which is only used to help understand the present application and does not limit the present application. According to the idea of the present application, a person skilled in the art of the present application can make some simple deductions, deformations or substitutions.

Claims

1. An encoder bracket, characterized by The encoder support comprises: a side wall, an inner side of the side wall having a receiving cavity for receiving an encoder rotor, the side wall being provided with a splicing gap penetrating through the inner side and the outer side of the side wall in a radial direction of the side wall, a first end of the side wall in an axial direction of the side wall being used for mounting a circuit board, and a second end of the side wall in the axial direction of the side wall being used for fixedly connecting with a motor stator; a splicing block being detachably mounted on the splicing gap.

2. The encoder bracket of claim 1, wherein, The side wall is provided with a limiting structure on at least one side in a circumferential direction of the splicing gap, and the splicing block is further provided with a limiting part, the limiting structure and the limiting part being matched to limit a position of the splicing block in a radial direction when the splicing block is mounted.

3. The encoder bracket of claim 2, wherein, The position of the splicing block in the radial direction when the splicing block is mounted is a position corresponding to a situation that an outer side surface of the splicing block is flush with an outer side surface of the side wall.

4. The encoder bracket of claim 2, wherein, The limiting structure is a clamping groove provided on a side wall of the splicing gap, and the limiting part comprises a receiving groove opened on an outer side surface of the splicing block and an elastic buckle fixed at an inner wall of the receiving groove, the elastic buckle being matched with the clamping groove to realize mounting of the splicing block.

5. The encoder bracket of claim 4, wherein, The elastic buckle is provided with a slot opened on a side surface close to a slot opening of the receiving groove, for a tool to be inserted into the slot to detach the elastic buckle from the clamping groove.

6. The encoder bracket of claim 2, wherein, The limiting structure is a threaded hole provided on the side wall on at least one side in the circumferential direction of the splicing gap, the threaded hole penetrating through the side wall in the radial direction, and the limiting part is a mounting hole provided on the splicing block, the mounting hole penetrating through the splicing block in the radial direction, the mounting hole being positionally corresponding to the threaded hole to allow one end of a screw to pass through and be fixedly connected with the threaded hole.

7. The encoder bracket of claim 2, wherein, The limiting structure is a first half threaded hole provided on a side wall of the splicing gap, the first half threaded hole penetrating through the side wall in the radial direction, and the limiting part is a second half threaded hole provided on an end surface in the circumferential direction of the splicing block, the second half threaded hole penetrating through the splicing block in the radial direction, the first half threaded hole being positionally corresponding to the second half threaded hole to be fixed by screwing a screw.

8. The encoder bracket of any one of claims 1-7, wherein, The splicing gap penetrates through both ends of the side wall in the axial direction.

9. The encoder bracket of any one of claims 1-7, wherein, An outer side in the circumferential direction of the side wall is further provided with a connecting lug, the connecting lug being outwardly protruded from the side wall in the radial direction, and the connecting lug being used for fixedly connecting with the motor stator.

10. An encoder comprising: The encoder support comprises: a side wall, an inner side of the side wall having a receiving cavity for receiving an encoder rotor, the side wall being provided with a splicing gap penetrating through the inner side and the outer side of the side wall in a radial direction of the side wall, a first end of the side wall in an axial direction of the side wall being used for mounting a circuit board, and a second end of the side wall in the axial direction of the side wall being used for fixedly connecting with a motor stator; a splicing block being detachably mounted on the splicing gap. The side wall is provided with a limiting structure on at least one side in a circumferential direction of the splicing gap, and the splicing block is further provided with a limiting part, the limiting structure and the limiting part being matched to limit a position of the splicing block in a radial direction when the splicing block is mounted. The position of the splicing block in the radial direction when the splicing block is mounted is a position corresponding to a situation that an outer side surface of the splicing block is flush with an outer side surface of the side wall. The limiting structure is a clamping groove provided on a side wall of the splicing gap, and the limiting part comprises a receiving groove opened on an outer side surface of the splicing block and an elastic buckle fixed at an inner wall of the receiving groove, the elastic buckle being matched with the clamping groove to realize mounting of the splicing block. The elastic buckle is provided with a slot opened on a side surface close to a slot opening of the receiving groove, for a tool to be inserted into the slot to detach the elastic buckle from the clamping groove. The limiting structure is a threaded hole provided on the side wall on at least one side in the circumferential direction of the splicing gap, the threaded hole penetrating through the side wall in the radial direction, and the limiting part is a mounting hole provided on the splicing block, the mounting hole penetrating through the splicing block in the radial direction, the mounting hole being positionally corresponding to the threaded hole to allow one end of a screw to pass through and be fixedly connected with the threaded hole. The limiting structure is a first half threaded hole provided on a side wall of the splicing gap, the first half threaded hole penetrating through the side wall in the radial direction, and the limiting part is a second half threaded hole provided on an end surface in the circumferential direction of the splicing block, the second half threaded hole penetrating through the splicing block in the radial direction, the first half threaded hole being positionally corresponding to the second half threaded hole to be fixed by screwing a screw. The splicing gap penetrates through both ends of the side wall in the axial direction. An outer side in the circumferential direction of the side wall is further provided with a connecting lug, the connecting lug being outwardly protruded from the side wall in the radial direction, and the connecting lug being used for fixedly connecting with the motor stator.

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