Hollow cup brushless motor

Abstract

The utility model discloses a coreless brushless motor, which relates to the technical field of motors and comprises a stator assembly, a rotor assembly and a circuit board assembly. A rotating cavity is formed in the stator assembly; the rotor assembly is rotationally arranged in the rotating cavity, and the rotor assembly is provided with a rotating shaft arranged in the axis direction of the rotor assembly; the circuit board assembly comprises a Hall plate, a support and a wiring board, the Hall plate, the support and the wiring board are arranged on the rotating shaft in a sleeving mode, the Hall plate and the wiring board are located on the two opposite sides of the support, and the Hall plate is located on the side, facing the stator assembly, of the support. The wiring board is electrically connected with the stator assembly, and the Hall plate is used for detecting rotation of the rotor assembly. The coreless brushless motor provided by the utility model can optimize the layout of the circuit board assembly, simplify the installation mode, and reduce the safety risk.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially relate to a hollow cup brushless motor. BACKGROUND

[0002] The hollow cup brushless motor is a kind of special structure miniature DC motor, compared with ordinary brushless DC motor, hollow cup brushless motor has many advantages such as small size, high efficiency, strong controllability, low noise and good heat dissipation effect.Hollow cup brushless motor is suitable for application in high-precision drive system, such as communication, robot, security, aerospace, rudder control system and other fields.

[0003] At present, when hollow cup brushless motor is used, the multiple wire ends of armature coil cup are prone to accumulate, thereby extra occupying the internal space of motor, the compactness of structure is affected, unnecessary complexity is brought to the overall layout of motor.

[0004] And, direct contact between coil and motor shell can also be caused.Once coil and shell touch, poor insulation can be caused, so not only the performance and service life of motor are affected, but also great security risks, such as short circuit, overheating and even fire risk, can be brought to the use of user. UTILITY MODEL CONTENT

[0005] The main purpose of the utility model is to provide a kind of hollow cup brushless motor, to optimize the layout of circuit board assembly, simplify installation mode, reduce security risk.

[0006] To achieve the above purpose, the utility model provides a kind of hollow cup brushless motor, the hollow cup brushless motor includes:

[0007] Stator assembly, the stator assembly is formed with rotation cavity;

[0008] Rotor assembly, the rotor assembly is rotationally arranged in the rotation cavity, the rotor assembly has rotation shaft along its axial direction;And

[0009] Circuit board assembly, the circuit board assembly includes hall plate, support and wiring board, the hall plate, the support and the wiring board are sleeved on the rotation shaft, the hall plate and the wiring board are located on the opposite sides of the support, and the hall plate is located on the side of the support facing the stator assembly, the wiring board and the stator assembly are electrically connected, and the hall plate is used to detect the rotation of the rotor assembly.

[0010] In an embodiment, the bracket comprises a bottom plate and a surrounding plate arranged around the periphery of the bottom plate, the bottom plate is formed with a through hole, the rotating shaft is movably arranged in the through hole, the bottom plate and the surrounding plate are integrally formed, and the bottom plate and the surrounding plate form a receiving groove; the Hall plate is arranged in the receiving groove, and the wiring board is arranged on the side of the bottom plate away from the receiving groove.

[0011] In an embodiment, the side of the bottom plate facing the receiving groove is provided with a plurality of limiting blocks, and the limiting blocks are arranged on the inner wall of the surrounding plate along the circumferential direction of the surrounding plate, and the limiting blocks abut against the side wall of the Hall plate.

[0012] The bottom plate extends away from the receiving groove near the through hole to form a boss protruding from the surface of the bottom plate, and the wiring board is sleeved on the outer wall of the boss.

[0013] In an embodiment, the side wall of the boss is provided with a limiting protrusion, and the inner wall of the wiring board is provided with a limiting groove matched with the limiting protrusion.

[0014] In an embodiment, the bottom plate is formed with a first avoiding hole, the wiring board is formed with a third avoiding hole corresponding to the first avoiding hole, and the wires of the Hall plate pass through the first avoiding hole and the third avoiding hole in sequence.

[0015] And / or, the first avoiding hole extends along the circumferential direction of the bottom plate.

[0016] And / or, the first avoiding hole is arranged adjacent to the boss.

[0017] In an embodiment, the wiring board is provided with a plurality of wiring heads, and the wiring heads and the third avoiding hole are arranged along the same circumferential direction.

[0018] In an embodiment, the bottom plate is formed with a plurality of second avoiding holes, and the second avoiding holes are used for the wires of the stator assembly to pass through.

[0019] And / or, the second avoiding hole is a long hole extending along the circumferential direction of the bottom plate.

[0020] And / or, along the circumferential direction of the bottom plate, the second avoiding hole is arranged alternately with the limiting block.

[0021] In an embodiment, the wiring board is formed with a plurality of fourth avoiding holes, and the fourth avoiding holes are arranged on the periphery of the wiring board along the circumferential direction of the wiring board, the fourth avoiding holes correspond to the second avoiding holes, and the wires of the stator assembly pass through the second avoiding holes and the fourth avoiding holes in sequence to be welded on the side of the wiring board away from the receiving groove.

[0022] In an embodiment, two ends of each of the second avoiding holes correspond to one of the fourth avoiding holes respectively.

[0023] In an embodiment, the stator assembly comprises:

[0024] A casing is formed with the rotating cavity, and a wire passing port is formed on a side of the casing close to the circuit board assembly, and the terminal board is connected with other devices through the wire passing port;

[0025] A stator core is annularly arranged on the inner wall of the casing and abuts against the support; and

[0026] An armature coil cup is arranged on the inner wall of the stator core and electrically connected with the terminal board.

[0027] The technical scheme of the utility model integrates the wires of the stator assembly to the terminal board through the electrical connection between the stator assembly and the terminal board, avoids the problem of traditional wire accumulation, improves the utilization rate of the internal space of the motor, and significantly reduces the safety risk caused by the disorder of the wires. Meanwhile, the Hall board and the terminal board are directly installed on the opposite sides of the support through the support structure, which not only simplifies the assembly process, but also ensures the stability of the circuit board assembly. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative labor.

[0029] Figure 1 The structure schematic diagram of an embodiment of the hollow cup brushless motor provided by the utility model is shown in the figure;

[0030] Figure 2 The cross-sectional view of the hollow cup brushless motor is shown in the figure; Figure 1

[0031] The structure schematic diagram of the circuit board assembly is shown in the figure; Figure 3 Figure 1 The exploded view of the circuit board assembly is shown in the figure;

[0032] Figure 4 The exploded view of the circuit board assembly from another perspective is shown in the figure. Figure 1

[0033] The exploded view of the circuit board assembly from another perspective is shown in the figure. Figure 5 Figure 1 The exploded view of the circuit board assembly from another perspective is shown in the figure.

[0034] ​​Brief Description of Drawings

[0035] 100, hollow cup brushless motor; 1, stator assembly; 11, rotating cavity; 12, shell; 121, wire port; 13, stator core; 14, armature coil cup; 15, front end cover; 16, rear end cover; 2, rotor assembly; 21, rotating shaft; 22, magnetic ring; 3, circuit board assembly; 31, Hall plate; 311, Hall element; 32, bracket; 321, bottom plate; 3211, through hole; 3212, limiting block; 3213, boss; 3214, limiting protrusion; 3215, first avoiding hole; 3216, second avoiding hole; 322, surrounding plate; 323, accommodating groove; 33, wiring board; 331, limiting groove; 332, third avoiding hole; 333, wiring head; 334, fourth avoiding hole.

[0036] The realization, functional features and advantages of the utility model will be further described in combination with embodiments with reference to the drawings. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0038] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0039] In addition, if the embodiments of the utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, taking "A and / or B" as an example, including A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0040] The hollow cup brushless motor is a special structure of miniature DC motor, compared with the ordinary brushless DC motor, the hollow cup brushless motor has the advantages of small size, high efficiency, strong controllability, small noise and good heat dissipation effect. The hollow cup brushless motor is suitable for application in high-precision driving system, such as communication, robot, security, aerospace, rudder control system and other fields.

[0041] At present, the hollow cup brushless motor in use, the multiple wire ends of the armature coil cup are prone to accumulate, thereby occupying the internal space of the motor, affecting the compactness of the structure, and bringing unnecessary complexity to the overall layout of the motor.

[0042] And, it may also cause direct contact between the coil and the motor shell. Once the coil touches the shell, it may cause poor insulation, which not only affects the performance and service life of the motor, but also may bring great safety hazards to the user, such as short circuit, overheating and even fire risk.

[0043] The main purpose of the utility model is to provide a hollow cup brushless motor 100, which aims to optimize the layout of the circuit board assembly 3, simplify the installation method and reduce the safety risk.

[0044] Please refer to Figures 1 to 5 In an embodiment of the utility model, the hollow cup brushless motor 100 includes a stator assembly 1, a rotor assembly 2 and a circuit board assembly 3. The stator assembly 1 forms a rotating cavity 11. The rotor assembly 2 is rotatably arranged in the rotating cavity 11, and the rotor assembly 2 has a rotating shaft 21 arranged along its axial direction. The circuit board assembly 3 includes a Hall plate 31, a bracket 32 and a wiring board 33, the Hall plate 31, the bracket 32 and the wiring board 33 are sleeved on the rotating shaft 21, the Hall plate 31 and the wiring board 33 are located on the opposite sides of the bracket 32, and the Hall plate 31 is located on the side of the bracket 32 facing the stator assembly 1, the wiring board 33 is electrically connected with the stator assembly 1, and the Hall plate 31 is used for detecting the rotation of the rotor assembly 2.

[0045] The technical scheme of the utility model realizes the electrical connection between the stator assembly 1 and the wiring board 33, integrates the wiring of the stator assembly 1 on the wiring board 33, avoids the problem of traditional wire accumulation, improves the utilization rate of the internal space of the motor, and significantly reduces the safety risk caused by the disorder of the wire. At the same time, through the structure of the bracket 32, the Hall plate 31 and the wiring board 33 are directly installed on the opposite sides of the bracket 32, which not only simplifies the assembly process, but also ensures the stability of the circuit board assembly 3.

[0046] It should be noted that in this embodiment, the included angle between the Hall elements 311 of the Hall plate 31 can be 60 degrees or 120 degrees. Among them, according to the magnetization pole number and slot number of the hollow cup brushless motor 100, the included angle between the Hall elements 311 can be adjusted adaptively.

[0047] Referring to Figure 4 and Figure 5 In an embodiment, the bracket 32 comprises a bottom plate 321 and a surrounding plate 322 arranged around the periphery of the bottom plate 321. The bottom plate 321 is formed with a through hole 3211 through which the rotating shaft 21 is movably arranged. The bottom plate 321 and the surrounding plate 322 are integrally formed. The bottom plate 321 and the surrounding plate 322 form a receiving groove 323. The Hall plate 31 is arranged in the receiving groove 323. The wiring board 33 is arranged on the side of the bottom plate 321 away from the receiving groove 323.

[0048] In the embodiment, the bracket 32 mainly comprises a bottom plate 321 and a surrounding plate 322 arranged around the periphery of the bottom plate 321. The bottom plate 321 is provided with a through hole 3211 through which the rotating shaft 21 passes. The bottom plate 321 and the surrounding plate 322 are integrally formed to reduce the error generated during assembly of the bottom plate 321 and the surrounding plate 322, and to improve the structural strength of the bracket 32. The receiving groove 323 formed by the surrounding plate 322 and the bottom plate 321 provides installation space for the Hall plate 31, which not only protects the Hall plate 31 from external interference and damage, but also ensures that the relative position between the Hall plate 31 and the rotor assembly 2 meets the requirements. The wiring board 33 is arranged on the side of the bottom plate 321 away from the receiving groove 323, avoiding interference between the wiring board 33 and the Hall plate 31, increasing the distance between the two, improving the heat dissipation efficiency, and reducing the safety risk.

[0049] Referring to Figure 4 and Figure 5 In an embodiment, the side of the bottom plate 321 facing the receiving groove 323 is provided with a plurality of limiting blocks 3212. The limiting blocks 3212 are arranged on the inner wall of the surrounding plate 322 along the circumferential direction of the surrounding plate 322, and abut against the side wall of the Hall plate 31. The bottom plate 321 extends away from the receiving groove 323 near the through hole 3211 to form a boss 3213 protruding from the surface of the bottom plate 321. The wiring board 33 is sleeved on the outer wall of the boss 3213.

[0050] In the embodiment, the side of the bottom plate 321 facing the receiving groove 323 is provided with a plurality of limiting blocks 3212. One side of the limiting blocks 3212 is connected with the side edge of the surrounding plate 322, and the opposite side abuts against the Hall plate 31. This can ensure the stable installation of the Hall plate 31 in the receiving groove 323, thereby improving the stability of detecting the rotor assembly 2. The bottom plate 321 extends away from the receiving groove 323 near the through hole 3211 to form a boss 3213. The wiring board 33 is sleeved on the outer wall of the boss 3213 and abuts against the side of the bottom plate 321 away from the receiving groove 323. This can ensure that the wiring board 33 is accurately installed on the bracket 32.

[0051] Optionally, the limiting plates are arranged uniformly along the circumferential direction of the enclosing plate 322 on the inner wall of the enclosing plate 322 to improve the stability when limiting the Hall plate 31.

[0052] Optionally, the height of the boss 3213 is equal to the height of the wiring board 33, so that when the wiring board 33 is sleeved on the boss 3213, the end surface of the wiring board 33 is aligned with the end surface of the boss 3213, thereby increasing the aesthetics. And the aligned end surface can assist the staff to judge whether the wiring board 33 is installed in place.

[0053] Please refer to Figure 4 and Figure 5 In an embodiment, the side wall of the boss 3213 is provided with a limiting protrusion 3214, and the inner wall of the wiring board 33 is provided with a limiting groove 331 matched with the limiting protrusion 3214.

[0054] In the present embodiment, the outer wall of the boss 3213 is also provided with a limiting protrusion 3214, and the inner wall of the wiring board 33 is provided with a limiting groove 331, when the wiring board 33 is sleeved on the boss 3213, the limiting protrusion 3214 is inserted into the limiting groove 331. This not only enhances the connection strength between the wiring board 33 and the boss 3213, prevents the wiring board 33 from loosening or displacement during the operation of the motor, but also further improves the reliability of the circuit board assembly 3. In addition, it is also helpful to simplify the assembly process, because the staff can directly align the limiting protrusion 3214 and the limiting groove 331, and then move the wiring board 33 and the bracket 32 to resist, to complete the installation of the wiring board 33, thereby greatly improving the assembly efficiency and accuracy.

[0055] Please refer to Figure 3 and Figure 4 In an embodiment, the bottom plate 321 is formed with a first avoiding hole 3215, the wiring board 33 is formed with a third avoiding hole 332 corresponding to the first avoiding hole 3215, and the wiring of the Hall plate 31 passes through the first avoiding hole 3215 and the third avoiding hole 332 in sequence. And / or, the first avoiding hole 3215 extends along the circumferential direction of the bottom plate 321. And / or, the first avoiding hole 3215 is arranged adjacent to the boss 3213.

[0056] In the embodiment, the bottom plate 321 and the wiring board 33 are respectively formed with a first avoiding hole 3215 and a third avoiding hole 332, and the wiring of the Hall plate 31 can be electrically connected with other devices through the first avoiding hole 3215 and the third avoiding hole 332. It can be understood that when the first avoiding hole 3215 extends along the circumferential direction of the bottom plate 321, it helps to disperse stress and improve the overall strength of the bottom plate 321. It can be understood that the first avoiding hole 3215 is arranged adjacent to the boss 3213, so that after the wiring of the Hall plate 31 passes through the first avoiding hole 3215, the boss 3213 can resist the side of the wiring of the Hall plate 31, thereby preventing the wiring of the Hall plate 31 from shaking or shifting during the operation of the motor.

[0057] Referring to Figure 3 and Figure 4 In an embodiment, the wiring board 33 is provided with a plurality of wiring heads 333, and the wiring heads 333 are arranged along the same circumferential direction as the third avoiding hole 332.

[0058] In the embodiment, the wiring heads 333 of the wiring board 33 are arranged along the same circumferential direction as the third avoiding hole 332, which can maximize the use of space on the wiring board 33, reduce unnecessary space waste, help to maintain the compactness of the internal structure of the motor, and improve the overall space utilization. Moreover, arranging along the same circumferential direction helps to improve the neatness of the wiring and avoid safety risks caused by messy wiring.

[0059] Referring to Figure 4 and Figure 5 In an embodiment, the bottom plate 321 is formed with a plurality of second avoiding holes 3216 for the wiring of the stator assembly 1 to pass through. And / or, the second avoiding hole 3216 is a long hole extending along the circumferential direction of the bottom plate 321. And / or, along the circumferential direction of the bottom plate 321, the second avoiding hole 3216 is arranged alternately with the limiting block 3212.

[0060] In the embodiment, the bottom plate 321 is formed with a plurality of second avoiding holes 3216 for the wiring of the stator assembly 1 to pass through, which helps to arrange the wiring neatly. It can be understood that the second avoiding hole 3216 is a long hole extending along the circumferential direction of the bottom plate 321, and the long hole allows the wiring to have a certain adjustment space when passing through, so as to adapt to different specifications or lengths of the wiring and ensure the smooth passing of the wiring. It can be understood that along the circumferential direction of the bottom plate 321, the second avoiding hole 3216 is arranged alternately with the limiting block 3212, so that after the wiring passes through the second avoiding hole 3216, the limiting plate can resist the side wall of the wiring, thereby preventing the wiring of the stator assembly 1 from shaking or shifting during the operation of the motor.

[0061] Referring to Figure 3 andFigure 4 In an embodiment, the terminal board 33 is formed with a plurality of fourth escape holes 334, which are arranged at the periphery of the terminal board 33 along the circumferential direction of the terminal board 33, and correspond to the second escape holes 3216. The wires of the stator assembly 1 pass through the second escape holes 3216 and the fourth escape holes 334 in sequence, and are welded to the side of the terminal board 33 opposite to the accommodating groove 323.

[0062] In the present embodiment, the wires of the stator assembly 1 can be welded to the terminal board 33 after passing through the second escape holes 3216 on the bottom plate 321. However, since the side of the terminal board 33 facing the bottom plate 321 is attached to the bottom plate 321, it is inconvenient to weld the wires. Therefore, the terminal board 33 is further formed with a plurality of fourth escape holes 334, so that the wires of the stator assembly 1 pass through the fourth escape holes 334 and are welded to the side of the terminal board 33 opposite to the bottom plate 321.

[0063] Referring to Figure 3 and Figure 4 In an embodiment, each second escape hole 3216 corresponds to two fourth escape holes 334 at both ends thereof.

[0064] In the present embodiment, the second escape holes 3216 are long holes, so that the wires of different stator assemblies 1 can pass through the same second escape hole 3216, thereby improving the flexibility during assembly. However, when welding the wires of the stator assembly 1 to the terminal board 33, the wires must be welded to the specified positions accurately for control. Therefore, the fourth escape holes 334 only allow a single wire to pass through. That is, in the present embodiment, each second escape hole 3216 allows two wires to pass through, and therefore, each second escape hole 3216 corresponds to two fourth escape holes 334, so as to separate the wires individually.

[0065] Referring to Figure 1 and Figure 2 In an embodiment, the stator assembly 1 includes a housing 12, a stator core 13, and an armature coil cup 14. The housing 12 is formed with a rotating cavity 11, and a wire passing port 121 is formed on the side of the housing 12 close to the circuit board assembly 3. The terminal board 33 is connected to other devices through the wire passing port 121. The stator core 13 is arranged around the inner wall of the housing 12 and abuts against the support 32. The armature coil cup 14 is arranged on the inner wall of the stator core 13 and is electrically connected to the terminal board 33.

[0066] In the embodiment, the stator assembly 1 comprises a housing 12, a stator core 13 arranged on the inner wall of the housing 12, and an armature coil cup 14 arranged on the inner wall of the stator core 13. The housing 12 is arranged to form a rotating cavity 11, and the side wall of the housing 12 is provided with a wire passing port 121 in communication with the rotating cavity 11. The wire connecting head 333 of the terminal plate 33 can be connected with other devices through the wire passing port 121. The rotor assembly 2 further comprises a magnetic ring 22 sleeved on the rotating shaft 21, and the magnetic ring 22 corresponds to the stator core 13. The hollow cup brushless motor 100 further comprises a front end cover 15 and a rear end cover 16 arranged at both ends of the housing 12, and the front end cover 15 and the rear end cover 16 are used to close the rotating cavity 11. The structures of the stator assembly 1, the rotor assembly 2, the front end cover 15 and the rear end cover 16 are common, and will not be described here.

[0067] The above is only an exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by using the utility model specification and the drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the utility model.

Claims

1. A hollow cup brushless motor, characterized by, The hollow cup brushless motor comprises: a stator assembly formed with a rotating cavity; a rotor assembly rotatably arranged in the rotating cavity, the rotor assembly having a rotating shaft arranged along an axial direction thereof; and a circuit board assembly comprising a Hall plate, a bracket and a wiring board, the Hall plate, the bracket and the wiring board being sleeved on the rotating shaft, the Hall plate and the wiring board being located on opposite sides of the bracket, the Hall plate being located on a side of the bracket facing the stator assembly, the wiring board being electrically connected with the stator assembly, and the Hall plate being used for detecting rotation of the rotor assembly.

2. The hollow cup brushless motor of claim 1, wherein, The bracket comprises a bottom plate and a surrounding plate annularly arranged around a periphery of the bottom plate, the bottom plate being formed with a through hole, the rotating shaft being movably arranged in the through hole, the bottom plate and the surrounding plate being integrally formed, and the bottom plate and the surrounding plate being formed with an accommodating groove in a manner of being enclosed, the Hall plate being arranged in the accommodating groove, and the wiring board being arranged on a side of the bottom plate away from the accommodating groove.

3. The hollow cup brushless motor of claim 2, wherein, A side of the bottom plate facing the accommodating groove is provided with a plurality of limiting blocks, the plurality of limiting blocks being arranged on an inner wall of the surrounding plate along a circumferential direction of the surrounding plate, and the limiting blocks abutting against a side wall of the Hall plate. The bottom plate extends away from the accommodating groove at a position close to the through hole to form a boss protruding from a surface of the bottom plate, and the wiring board is sleeved on an outer wall of the boss.

4. The hollow cup brushless motor of claim 3, wherein, A side wall of the boss is provided with a limiting protrusion, and an inner wall of the wiring board is provided with a limiting groove matched with the limiting protrusion.

5. The hollow cup brushless motor of claim 3, wherein, The bottom plate is formed with a first avoiding hole, the wiring board is formed with a third avoiding hole corresponding to the first avoiding hole, and wires of the Hall plate pass through the first avoiding hole and the third avoiding hole in sequence. The first avoiding hole extends along a circumferential direction of the bottom plate. The first avoiding hole is arranged adjacent to the boss.

6. The hollow cup brushless motor of claim 5, wherein, The wiring board is provided with a plurality of wire heads, and the wire heads and the third avoiding hole are arranged along the same circumferential direction.

7. The hollow cup brushless motor of claim 3, wherein, The bottom plate is formed with a plurality of second avoiding holes, and the plurality of second avoiding holes are used for wires of the stator assembly to pass through. The second avoiding hole is a long hole extending along a circumferential direction of the bottom plate. The second avoiding hole and the limiting block are arranged alternately along the circumferential direction of the bottom plate.

8. The hollow cup brushless motor of claim 7, wherein, The wiring board is formed with a plurality of fourth avoiding holes, the plurality of fourth avoiding holes being arranged on a periphery of the wiring board along a circumferential direction of the wiring board, the fourth avoiding holes corresponding to the second avoiding holes, and wires of the stator assembly passing through the second avoiding holes and the fourth avoiding holes in sequence to be welded on a side of the wiring board away from the accommodating groove.

9. The hollow cup brushless motor of claim 8, wherein, Two ends of each of the second avoiding holes correspond to a fourth avoiding hole respectively.

10. The hollow cup brushless motor according to any one of claims 1 to 9, wherein, The stator assembly comprises: a casing formed with the rotating cavity, the casing being formed with a wire passing port at a side close to the circuit board assembly, and the wiring board being connected with other devices through the wire passing port; a stator core annularly arranged on an inner wall of the casing and abutting against the bracket; and An armature coil cup is arranged on the inner wall of the stator core and is electrically connected with the terminal plate.

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