Brushless motor

Abstract

The invention relates to the technical field of motor installation, and provides a brushless motor which comprises a motor body, an installation support and a fastening assembly. A power output shaft is arranged at one end of the motor body, and a clamping groove is formed in the power output shaft in the circumferential direction of the power output shaft; the installation support is detachably connected to the end, located on the power output shaft, of the motor body. The fastening assembly comprises a fastening sleeve and a fastening elastic piece. The fastening sleeve is arranged on the motor body in a penetrating mode, and one end of the fastening sleeve abuts against the side, away from the motor body, of the installation support. The fastening elastic piece is clamped in the clamping groove through elasticity and abuts against the end, away from the mounting support, of the fastening sleeve. Therefore, the working stability of the brushless motor can be improved.

Description

Technical Field

[0001] The present application relates to the field of motor installation, and in particular to a brushless motor. Background Art

[0002] A brushless motor is a motor that uses direct current but does not require brushes for commutation. It has the advantages of high efficiency, low energy consumption, low noise, long life, high reliability, servo control, and stepless frequency and speed regulation. It is mostly used in advanced electric vehicles, hybrid electric vehicles, medical equipment, power tools, industrial automation products, etc.

[0003] In the related art, the brushless motor includes a motor body and a mounting bracket, wherein the mounting bracket is detachably connected to one end of the motor body and fixedly connected to the product through the mounting bracket, thereby fixing the motor body. The shape of the mounting bracket is adapted to the product to be installed. Since the mounting bracket is detachably connected to the motor body, mounting brackets of different shapes can be replaced according to actual needs to be suitable for different products, thereby improving the applicability of the brushless motor.

[0004] However, in actual applications, the mounting bracket and the motor body are prone to loosening, resulting in poor working stability of the brushless motor, so improvement is needed. Summary of the invention

[0005] In order to improve the working stability of a brushless motor, the present application provides a brushless motor.

[0006] The present application provides a brushless motor adopting the following technical solution: A brushless motor comprises a motor body, a mounting bracket and a fastening assembly; a power output shaft is provided at one end of the motor body, and a clamping groove is provided on the power output shaft along its circumference; the mounting bracket is detachably connected to the motor body at one end of the power output shaft; the fastening assembly comprises a fastening sleeve and a fastening spring; the fastening sleeve is passed through the motor body and one end of the fastening sleeve abuts against a side of the mounting bracket away from the motor body; the fastening spring is elastically clamped in the clamping groove and abuts against one end of the fastening sleeve away from the mounting bracket.

[0007] By adopting the above technical solution, in actual applications, the fastening sleeve is inserted into the motor body to protect the components in the motor body, one end of the fastening sleeve is abutted against the side of the mounting bracket away from the motor body, and the fastening spring sheet elastically clamped in the clamping groove is clamped against the end of the fastening sleeve away from the mounting bracket, so that the mounting bracket is pressed between the motor body and the fastening sleeve. Even if the detachable connection between the mounting bracket and the motor body becomes loose, the stability of the installation of the mounting bracket can be guaranteed, thereby improving the working stability of the brushless motor.

[0008] Preferably, the fastening assembly further comprises a fastening ring, which is located between the fastening sleeve and the fastening spring sheet, and has one end rotatably connected to the fastening sleeve and the other end pressed against the fastening spring sheet.

[0009] By adopting the above technical solution and providing a fastening ring, the dry friction between the fastening spring sheet and the fastening sleeve can be effectively reduced, and the normal operation of the brushless motor can be guaranteed while ensuring the tightening effect on the mounting bracket.

[0010] Preferably, the fastening assembly further comprises a bearing, the bearing is sleeved on the power output shaft at the clamping groove, and the fastening spring is elastically clamped to the bearing and confined in the clamping groove.

[0011] By adopting the above technical solution and setting a bearing, the fastening spring sheet and the power output shaft can rotate relative to each other, so that the fastening spring sheet can abut the fastening sleeve more stably and reduce the friction force on the rotation of the power output shaft.

[0012] Preferably, the fastening assembly also includes a limiting shaft and a limiting spring, the limiting shaft is slidably connected to the fastening spring sheet, the limiting spring is arranged between the limiting shaft and the fastening spring sheet to drive the limiting shaft to block the opening of the fastening spring sheet, and the limiting shaft abuts against the bearing.

[0013] By adopting the above technical solution, a limit shaft and a limit spring are set to block the opening of the fastening spring sheet, and the limit shaft abuts against the peripheral side of the bearing to prevent the fastening spring sheet from accidentally falling off the bearing, thereby improving the stability of the fastening spring sheet connection and ensuring the stability of the fastening of the mounting bracket.

[0014] Preferably, a positioning column is provided on one side of the mounting bracket close to the fastening sleeve, a positioning hole is formed on the fastening sleeve, and the positioning column is inserted into the positioning hole.

[0015] By adopting the above technical solution, by providing the positioning column and the positioning hole, the positioning installation of the fastening sleeve and the mounting bracket can be achieved, and the relative movement between the fastening sleeve and the mounting bracket can be restricted.

[0016] Preferably, the mounting bracket is provided with a mounting hole, a positioning spring is provided between the mounting hole and the positioning column, the positioning spring is used to drive the positioning column to extend out of the positioning hole, and the fastening sleeve is provided with a rotation groove along its circumference at one end close to the mounting bracket, and the rotation groove is connected to the positioning hole.

[0017] By adopting the above technical solution, by setting a positioning spring and a rotating groove, the positioning spring drives the positioning column to extend out of the positioning hole, so that the positioning column is more stably inserted into the positioning hole. When the mounting bracket needs to be replaced, before removing the fastening spring sheet, the positioning column is pressed and the fastening sleeve is rotated to make the positioning column move along the rotating groove. After removing the fastening spring sheet, the positioning column is driven by the positioning spring to lift the fastening sleeve to facilitate the separation of the fastening sleeve and the mounting bracket, thereby facilitating the removal of the fastening sleeve.

[0018] Preferably, the groove depth of the rotating groove gradually decreases from one end close to the positioning hole toward the other end.

[0019] By adopting the above technical solution, the depth of the rotating groove is gradually reduced from one end close to the positioning hole toward the other end, so that the positioning column can be rotated into the rotating groove by pressing the positioning column a small distance, and when the positioning column moves to the end of the rotating groove away from the positioning hole, the force applied by the positioning spring to the positioning column increases, making it easier to separate the fastening sleeve from the mounting bracket.

[0020] Preferably, a limiting hole is formed on the end of the fastening sleeve located away from the positioning hole.

[0021] By adopting the above technical solution and providing the limiting hole, when the positioning column moves along the rotation groove to the limiting hole, the rotation of the positioning column can be restricted, so that the positioning column can lift the fastening sleeve more stably.

[0022] Preferably, the fastening assembly also includes a pull rope, one end of which is arranged at one end of the limiting shaft away from the fastening spring plate, and the other end is passed through the fastening sleeve, and the end of the pull rope away from the limiting shaft is arranged perpendicular to the limiting hole and passed through the limiting hole.

[0023] By adopting the above technical solution, a pull rope is set so that the pull rope can be used to pull the limit shaft, thereby facilitating the installation and disassembly of the fastening spring piece, and when the positioning column moves from the rotating groove to the limit hole, the positioning column moves along the limit hole driven by the positioning spring, so that the positioning column squeezes the pull rope, so that the pull rope pulls the limit shaft to automatically release the blockage of the limit shaft on the fastening spring piece, so as to facilitate the disassembly of the fastening spring piece.

[0024] Preferably, two limiting posts are provided at one end of the fastening sleeve close to the fastening spring sheet, and the two limiting posts are arranged at intervals and abut against the opening of the fastening spring sheet, so that the fastening sleeve and the fastening spring sheet rotate synchronously.

[0025] By adopting the above technical solution, two limit columns are set to achieve the positioning and installation of the fastening spring piece, and under the action of the two limit columns, the fastening sleeve and the fastening spring piece rotate synchronously to ensure the normal operation of the pull rope and the stable operation of the fastening assembly.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. In practical applications, the fastening sleeve is inserted into the motor body to protect the parts in the motor body. One end of the fastening sleeve abuts against the side of the mounting bracket away from the motor body, and the fastening spring sheet elastically clamped in the clamping groove abuts against the end of the fastening sleeve away from the mounting bracket, so that the mounting bracket is pressed between the motor body and the fastening sleeve. Even if the detachable connection between the mounting bracket and the motor body is loosened, the stability of the mounting bracket can be ensured, thereby improving the working stability of the brushless motor; 2. By setting a positioning spring and a rotating groove, the positioning spring drives the positioning column to extend out of the positioning hole, so that the positioning column is more stably inserted into the positioning hole. When the mounting bracket needs to be replaced, before removing the fastening spring sheet, the positioning column is pressed and the fastening sleeve is rotated so that the positioning column moves along the rotating groove. After removing the fastening spring sheet, the positioning column pushes up the fastening sleeve driven by the positioning spring to facilitate the separation of the fastening sleeve from the mounting bracket, thereby facilitating the removal of the fastening sleeve; 3. By setting a pull rope, it is convenient to use the pull rope to pull the limit shaft, so as to facilitate the installation and removal of the fastening spring piece. When the positioning column moves from the rotating groove to the limit hole, the positioning column moves along the limit hole driven by the positioning spring, so that the positioning column squeezes the pull rope, so that the pull rope pulls the limit shaft to automatically release the blockage of the limit shaft on the fastening spring piece, so as to facilitate the removal of the fastening spring piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the overall structure of the brushless motor in Example 1 of the present application; Figure 2 It is a schematic diagram of the exploded structure of the brushless motor in Example 1 of the present application; Figure 3 is a schematic diagram of the overall structure of the brushless motor in Example 2 of the present application; Figure 4 It is a schematic diagram of the partial structure of the brushless motor in Example 2 of the present application; Figure 5 is a partial exploded schematic diagram of the brushless motor in Example 2 of the present application; Figure 6 is a schematic diagram of the overall structure of the fastening sleeve in Example 2 of the present application; Figure 7 It is a schematic diagram of the partial structure of the fastening assembly in Example 2 of the present application.

[0028] Figure numerals: 1. Motor body; 11. Power output shaft; 12. Snap-in groove; 2. Mounting bracket; 21. Positioning column; 22. Mounting hole; 23. Positioning spring; 3. Fastening assembly; 31. Fastening sleeve; 311. Positioning hole; 312. Rotating groove; 313. Limiting hole; 314. Limiting column; 32. Fastening spring; 33. Fastening ring; 34. Bearing; 35. Limiting shaft; 36. Limiting spring; 37. Pull rope. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-7 This application is described in further detail.

[0030] The embodiment of the present application discloses a brushless motor.

[0031] Embodiment 1: Reference Figure 1 and Figure 2 The brushless motor includes a motor body 1, a mounting bracket 2 and a fastening assembly 3. A power output shaft 11 protrudes from the upper end of the motor body 1. The power output shaft 11 is provided with a clamping groove 12 along its circumference. The mounting bracket 2 is detachably connected to the upper end of the motor body 1. In this embodiment, the mounting bracket 2 is detachably connected to the motor body 1 by bolt connection. In other embodiments, it can also be achieved by clamping, plugging, etc.

[0032] The fastening assembly 3 includes a fastening sleeve 31 and a fastening spring 32. The lower end of the fastening sleeve 31 is coaxially arranged in the motor body 1, and the power output shaft 11 is located in the fastening sleeve 31. The fastening sleeve 31 can protect the components in the motor body 1. The upper end of the fastening sleeve 31 abuts against the upper side of the mounting bracket 2. The fastening spring 32 has a "V"-shaped opening. The fastening spring 32 is elastically clamped in the clamping groove 12, and the fastening spring 32 abuts against the upper end of the fastening sleeve 31.

[0033] In actual application, after the mounting bracket 2 is installed on the motor body 1, the fastening sleeve 31 is first coaxially inserted into the motor body 1, so that the upper end of the fastening sleeve 31 abuts against the upper side of the mounting bracket 2, and then the fastening spring piece 32 is clamped in the clamping groove 12, so that the fastening spring piece 32 abuts against the upper end of the fastening sleeve 31, so that the mounting bracket 2 is pressed between the motor body 1 and the fastening sleeve 31, even if the detachable connection between the mounting bracket 2 and the motor body 1 becomes loose, the stability of the installation of the mounting bracket 2 can be guaranteed, thereby improving the working stability of the brushless motor.

[0034] In some embodiments, the fastening assembly 3 further includes a fastening ring 33, and the fastening ring 33 is located between the fastening sleeve 31 and the fastening spring sheet 32. Specifically, one end of the fastening ring 33 is rotatably connected to the fastening sleeve 31, and the other end is pressed against the fastening spring sheet 32. When the brushless motor is working, the fastening spring sheet 32 ​​rotates with the power output shaft 11, and the fastening ring 33 replaces the fastening spring sheet 32 ​​and presses against the fastening sleeve 31, which can effectively reduce the dry friction between the fastening spring sheet 32 ​​and the fastening sleeve 31, and ensure the normal operation of the brushless motor while ensuring the pressing effect on the mounting bracket 2.

[0035] The implementation principle of this embodiment is as follows: in actual application, after the mounting bracket 2 is installed on the motor body 1, the fastening sleeve 31 is first coaxially inserted into the motor body 1, so that the upper end of the fastening sleeve 31 abuts against the upper side of the mounting bracket 2, and then the fastening spring piece 32 is clamped in the clamping groove 12, so that the fastening spring piece 32 abuts against the upper end of the fastening sleeve 31, so that the mounting bracket 2 is pressed between the motor body 1 and the fastening sleeve 31, even if the detachable connection between the mounting bracket 2 and the motor body 1 is loosened, the stability of the installation of the mounting bracket 2 can be guaranteed, thereby improving the working stability of the brushless motor.

[0036] Embodiment 2: Reference Figure 3 and Figure 4 , the other structures of this embodiment are the same as those of the embodiment 1, and the difference lies in the structure of the fastening assembly 3. Specifically, the fastening assembly 3 also includes a bearing 34, the inner ring of the bearing 34 is sleeved on the power output shaft 11 and located in the clamping groove 12, and at the same time, the fastening spring piece 32 is elastically clamped on the outer ring of the bearing 34, so that the fastening spring piece 32 and the power output shaft 11 can rotate relative to each other, and the fastening spring piece 32 is prevented from rotating when it is pressed against the fastening sleeve 31 as much as possible, so as to improve the stability of the fastening sleeve 31, thereby improving the stability of the installation of the mounting bracket 2, and at the same time, it can also reduce the friction force of the power output shaft 11 when rotating.

[0037] In some embodiments, the fastening assembly 3 also includes a limiting shaft 35 and a limiting spring 36. The limiting shaft 35 is slidably connected in the fastening spring sheet 32 ​​and one end is located at the opening of the fastening spring sheet 32. One end of the limiting spring 36 is fixedly connected to the outer side of the fastening spring sheet 32, and the other end is fixedly connected to the limiting shaft 35 to drive the limiting shaft 35 to slide so that the limiting shaft 35 blocks the opening of the fastening spring sheet 32, and the limiting shaft 35 abuts against the peripheral side of the bearing 34. In this way, the limiting shaft 35 needs to be pulled outward so that the limiting shaft 35 slides out of the opening of the fastening spring sheet 32, so that the fastening spring sheet 32 ​​can be separated from the bearing 34, and the fastening spring sheet 32 ​​can be prevented from accidentally falling off the bearing 34 as much as possible, thereby improving the stability of the fastening spring sheet 32, and then ensuring the stability of the fastening of the mounting bracket 2.

[0038] Reference Figure 4 In some embodiments, a positioning column 21 is provided on the upper side of the mounting bracket 2, and correspondingly, a positioning hole 311 is opened on the fastening sleeve 31, and the positioning column 21 is inserted into the positioning hole 311 to achieve the positioning installation of the fastening sleeve 31 and the mounting bracket 2, and can limit the relative movement between the fastening sleeve 31 and the mounting bracket 2.

[0039] Reference Figure 5 In some embodiments, a mounting hole 22 is provided on the mounting bracket 2, one end of the positioning column 21 is located in the mounting hole 22, and a positioning spring 23 is provided between the mounting hole 22 and the positioning column 21. Specifically, one end of the positioning spring 23 is fixedly connected to the positioning column 21, and the other end is fixedly connected to the bottom wall of the mounting hole 22. The positioning spring 23 drives the positioning column 21 to extend out of the positioning hole 311, so that the positioning column 21 is more stably inserted into the positioning hole 311.

[0040] Reference Figure 6 At the same time, a rotation groove 312 is provided on the lower side of the upper end of the fastening sleeve 31. The rotation groove 312 is arranged along the circumference of the fastening sleeve 31 and one end is connected to the positioning hole 311. When the mounting bracket 2 needs to be replaced, before removing the fastening spring 32, the positioning column 21 is pressed and the fastening sleeve 31 is rotated so that the positioning column 21 moves along the rotation groove 312. After removing the fastening spring 32, the positioning column 21 is driven by the positioning spring 23 to lift the fastening sleeve 31, so as to facilitate the separation of the fastening sleeve 31 from the mounting bracket 2, thereby facilitating the removal of the fastening sleeve 31. It should be noted that there are two positioning columns 21 and two positioning springs 23 to fully and stably lift the fastening sleeve 31.

[0041] In some embodiments, the depth of the rotation groove 312 is gradually reduced from one end close to the positioning hole 311 to the other end, so that the height difference between the positioning column 21 extending out of the positioning hole 311 and the rotation groove 312 is small, so that the positioning column 21 can be rotated into the rotation groove 312 by pressing the positioning column 21 for a small distance. In addition, when the positioning column 21 moves to the end of the rotation groove 312 away from the positioning hole 311, the positioning spring 23 is continuously squeezed to increase the force applied to the positioning column 21, so that the fastening sleeve 31 is more easily separated from the mounting bracket 2.

[0042] In some embodiments, a limiting hole 313 is provided at one end of the fastening sleeve 31 located in the rotating groove 312 away from the positioning hole 311. When the positioning column 21 moves along the rotating groove 312 to the limiting hole 313, the rotation of the positioning column 21 can be limited, so that the positioning column 21 can lift the fastening sleeve 31 more stably.

[0043] Reference Figure 5 , Figure 6 and Figure 7In some embodiments, the fastening assembly 3 further includes a pull rope 37, one end of which is fixedly connected to the end of the limit shaft 35 away from the fastening spring sheet 32, and the limit shaft 35 can be pulled so that the limit shaft 35 contacts and blocks the fastening spring sheet 32, thereby facilitating the installation and removal of the fastening spring sheet 32. The other end of the pull rope 37 is passed through the fastening sleeve 31 and the end is fixedly connected to the fastening sleeve 31, and the end of the pull rope 37 is perpendicular to the length direction of the limit hole 313 and is passed through the limit hole 313.

[0044] When the fastening spring piece 32 is clamped on the bearing 34, the limiting spring 36 drives the limiting shaft 35 to move so that the limiting shaft 35 blocks the opening of the fastening spring piece 32. At this time, the pull rope 37 is pulled to make the pull rope 37 in a taut state. When the mounting bracket 2 needs to be replaced, the positioning column 21 is pressed and the fastening sleeve 31 is rotated to make the positioning column 21 move along the rotating groove 312. When the positioning column 21 moves from the rotating groove 312 to the limiting hole 313, the positioning column 21 moves along the limiting hole 313 driven by the positioning spring 23, so that the positioning column 21 squeezes the pull rope 37 passing through the positioning hole 311, so that the pull rope 37 pulls the limiting shaft 35 to automatically release the blocking of the fastening spring piece 32 by the limiting shaft 35, so as to facilitate the disassembly of the fastening spring piece 32. It should be noted that, under the action of the pull rope 37 , the fastening spring piece 32 is connected to the fastening sleeve 31 , which can minimize the occurrence of the fastening spring piece 32 being lost.

[0045] Reference Figure 5 In some embodiments, two circular limiting posts 314 are protruded from the upper end of the fastening sleeve 31. The two limiting posts 314 are arranged at intervals and abut against the opening of the fastening spring piece 32, so as to realize the positioning and installation between the fastening spring piece 32 and the fastening sleeve 31, and at the same time limit the rotation of the fastening spring piece 32, so that the fastening sleeve 31 and the fastening spring piece 32 can rotate synchronously, avoid the entanglement of the pull rope 37 as much as possible, and keep it in a stable taut state to ensure the normal operation of the pull rope 37 and ensure the stable operation of the fastening component 3.

[0046] The implementation principle of this embodiment is as follows: when the fastening spring piece 32 is clamped on the bearing 34, the limiting spring 36 drives the limiting shaft 35 to move so that the limiting shaft 35 blocks the opening of the fastening spring piece 32. At this time, the pull rope 37 is pulled to make the pull rope 37 in a taut state. When the mounting bracket 2 needs to be replaced, the positioning column 21 is pressed and the fastening sleeve 31 is rotated so that the positioning column 21 moves along the rotating groove 312. When the positioning column 21 moves from the rotating groove 312 to the limiting hole 313, the positioning column 21 moves along the limiting hole 313 driven by the positioning spring 23, so that the positioning column 21 squeezes the pull rope 37 passing through the positioning hole 311, so that the pull rope 37 pulls the limiting shaft 35 to automatically release the blocking of the fastening spring piece 32 by the limiting shaft 35, so as to facilitate the disassembly of the fastening spring piece 32.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A brushless motor, characterized in that: The invention comprises a motor body (1), a mounting bracket (2) and a fastening assembly (3); a power output shaft (11) is provided at one end of the motor body (1), and a clamping groove (12) is provided on the power output shaft (11) along its circumference; the mounting bracket (2) is detachably connected to one end of the motor body (1) located at the power output shaft (11); the fastening assembly (3) comprises a fastening sleeve (31) and a fastening spring sheet (32); the fastening sleeve (31) is passed through the motor body (1) and one end of the fastening sleeve abuts against a side of the mounting bracket (2) away from the motor body (1); the fastening spring sheet (32) is elastically clamped in the clamping groove (12) and abuts against an end of the fastening sleeve (31) away from the mounting bracket (2).

2. A brushless motor according to claim 1, characterized in that: The fastening assembly (3) further comprises a fastening ring (33), which is located between the fastening sleeve (31) and the fastening spring sheet (32), and has one end rotatably connected to the fastening sleeve (31) and the other end pressed against the fastening spring sheet (32).

3. A brushless motor according to claim 1, characterized in that: The fastening assembly (3) further comprises a bearing (34), the bearing (34) being sleeved on the power output shaft (11) at the clamping groove (12), and the fastening spring sheet (32) being elastically clamped on the bearing (34) and being limited in the clamping groove (12).

4. A brushless motor according to claim 3, characterized in that: The fastening assembly (3) further comprises a limiting shaft (35) and a limiting spring (36); the limiting shaft (35) is slidably connected to the fastening spring sheet (32); the limiting spring (36) is arranged between the limiting shaft (35) and the fastening spring sheet (32) to drive the limiting shaft (35) to block the opening of the fastening spring sheet (32); and the limiting shaft (35) abuts against the bearing (34).

5. A brushless motor according to claim 4, characterized in that: A positioning column (21) is provided on one side of the mounting bracket (2) close to the fastening sleeve (31), a positioning hole (311) is provided on the fastening sleeve (31), and the positioning column (21) is inserted into the positioning hole (311).

6. A brushless motor according to claim 5, characterized in that: The mounting bracket (2) is provided with a mounting hole (22), a positioning spring (23) is provided between the mounting hole (22) and the positioning column (21), the positioning spring (23) is used to drive the positioning column (21) to extend out of the positioning hole (311), and one end of the fastening sleeve (31) close to the mounting bracket (2) is provided with a rotation groove (312) along its circumference, and the rotation groove (312) is communicated with the positioning hole (311).

7. A brushless motor according to claim 6, characterized in that: The depth of the rotating groove (312) gradually decreases from one end close to the positioning hole (311) toward the other end.

8. A brushless motor according to claim 6, characterized in that: The fastening sleeve (31) is provided with a limiting hole (313) at one end of the rotating groove (312) away from the positioning hole (311).

9. A brushless motor according to claim 8, characterized in that: The fastening assembly (3) further comprises a pull rope (37), one end of the pull rope (37) being arranged at an end of the limiting shaft (35) away from the fastening spring sheet (32), and the other end of the pull rope (37) being passed through the fastening sleeve (31), and the end of the pull rope (37) away from the limiting shaft (35) being arranged perpendicular to the limiting hole (313) and passing through the limiting hole (313).

10. A brushless motor according to claim 9, characterized in that: Two limiting posts (314) are provided at one end of the fastening sleeve (31) close to the fastening spring sheet (32); the two limiting posts (314) are arranged at intervals and abut against the opening of the fastening spring sheet (32), so that the fastening sleeve (31) and the fastening spring sheet (32) rotate synchronously.

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