Hollow cup brushless motor

Abstract

The utility model discloses a coreless brushless motor, and relates to the technical field of motors. The coreless brushless motor comprises a casing, a rotor assembly, a stator assembly, a circuit board assembly, a support ring, a drive board assembly and a steel needle connecting piece. The shell is provided with a rotating cavity and a connecting surface; the rotor assembly is rotationally arranged in the rotating cavity; the stator assembly is arranged on the inner wall of the rotating cavity; the circuit board assembly is arranged in the rotating cavity and is electrically connected with the stator assembly; the supporting ring is arranged in the circumferential direction of the connecting face and provided with a supporting face back to the connecting face. The driving plate assembly is arranged on the supporting surface, so that a first interval space is formed between the driving plate assembly and the connecting surface; one end of the steel needle connecting piece is electrically connected with the circuit board assembly, and the other end of the steel needle connecting piece is electrically connected with the driving plate assembly, so that the circuit board assembly is electrically connected with the driving plate assembly through the steel needle connecting piece. According to the technical scheme provided by the utility model, the interference among components is reduced, and meanwhile, the installation flexibility of the driving plate assembly is improved.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a hollow cup brushless motor. Background Technology

[0002] Coreless brushless motors are high-performance motors characterized by their small size, light weight, high efficiency, low noise, and fast response speed. They are suitable for high-precision drive systems, such as those used in communications, robotics, security, aerospace, and steering systems.

[0003] In existing coreless brushless motors, a typical configuration includes a housing, and a stator assembly, a rotor assembly, a circuit board assembly, and a drive board assembly housed within the rotating cavity of the housing. The stator assembly is located on the inner wall of the rotating cavity and drives the rotor assembly to rotate via electromagnetic forces. The circuit board assembly is electrically connected to the stator assembly, controlling the motor's operation. The drive board assembly is electrically connected to the circuit board assembly and connects to external devices via cables. This configuration results in both the drive board assembly and the circuit board assembly being housed within the rotating cavity, leading to overcrowding, potential interference between components, and poor heat dissipation. To avoid interference, the space within the rotating cavity is typically increased; however, this increases the motor's size and cost. Furthermore, since the drive board assembly is a consumable component, its location within the rotating cavity hinders maintenance.

[0004] Furthermore, when fixing the drive board assembly, a raised structure is usually set on the housing to limit the drive board assembly for installation and to prevent interference between the drive board assembly and the housing end cover. However, this design lacks flexibility during installation, making it impossible to adjust to different drive board assemblies or installation requirements. This results in the drive board assembly not maintaining an appropriate distance from the housing end cover, thus affecting the overall assembly accuracy of the motor. Simultaneously, the process of forming the raised structure during housing machining increases the complexity of housing processing, raises the precision requirements of the molds, and increases manufacturing costs. Utility Model Content

[0005] The main purpose of this invention is to propose a hollow cup brushless motor, which aims to reduce interference between components, achieve motor miniaturization, and improve the flexibility of drive board assembly installation.

[0006] To achieve the above objectives, this utility model proposes a hollow cup brushless motor, which includes:

[0007] A housing, wherein the housing is provided with a rotating cavity and a connecting surface located on the outer side of the rotating cavity;

[0008] A rotor assembly, wherein the rotor assembly is rotatably disposed within the rotating cavity;

[0009] A stator assembly, disposed on the inner wall of the rotating cavity, is used to drive the rotor assembly to rotate;

[0010] A circuit board assembly, wherein the circuit board assembly is disposed within the rotating cavity and is electrically connected to the stator assembly;

[0011] A support ring, the support ring being arranged circumferentially along the connecting surface and having a support surface facing away from the connecting surface;

[0012] A drive plate assembly, wherein the drive plate assembly is disposed on the support surface such that a first gap space exists between the drive plate assembly and the connecting surface; and

[0013] A steel pin connector, one end of which is electrically connected to the circuit board assembly and the other end of which is electrically connected to the drive board assembly, so that the circuit board assembly is electrically connected to the drive board assembly through the steel pin connector.

[0014] In one embodiment, the support ring has a positioning post protruding from the support surface, the drive plate assembly has a positioning hole corresponding to the positioning post, the drive plate assembly is supported on the support surface, and the positioning post is limited to the positioning hole.

[0015] In one embodiment, a cable is provided on the side of the drive board assembly facing away from the support surface. The cable and the steel pin connector are symmetrically arranged on both sides of the drive board assembly. The cable is used to connect to other devices.

[0016] The positioning post includes two posts, which are spaced apart on the support surface. The drive board assembly has a positioning hole for each positioning post. The distance between the two positioning posts and the cable is equal along the circumferential direction of the drive board assembly.

[0017] In one embodiment, the circuit board assembly includes a circuit board body and a terminal frame. The circuit board body is disposed within the rotating cavity and is electrically connected to the stator assembly. The terminal frame is disposed on the side of the circuit board body facing away from the stator assembly.

[0018] One end of the steel pin connector is inserted into the terminal frame and electrically connected to the circuit board body.

[0019] In one embodiment, the connecting surface has a first notch communicating with the rotating cavity. The first notch connects the rotating cavity and the first interval space. The first notch is correspondingly arranged with the terminal frame so that the other end of the steel pin connector passes through the first notch and is electrically connected to the drive board assembly.

[0020] In one embodiment, the first notch is located at the periphery of the connecting surface, and the support ring has a second notch corresponding to the first notch.

[0021] In one embodiment, the hollow cup brushless motor further includes a bracket disposed on the inner wall of the rotating cavity. One side of the bracket abuts against the stator assembly, and the other side of the bracket forms a mounting surface. The bracket is provided with a baffle protruding from the mounting surface. The circuit board assembly is supported on the mounting surface. The baffle abuts against the terminal frame and is correspondingly disposed to the first notch.

[0022] In one embodiment, the housing includes a main body and a rear end cover. The main body has the rotating cavity and an opening communicating with the rotating cavity. The rear end cover is disposed in the opening, and the connecting surface is formed on the side of the rear end cover facing away from the rotating cavity.

[0023] In one embodiment, the circuit board assembly is a Hall plate, which is provided with a plurality of Hall sensors. The plurality of Hall sensors are located on the side of the Hall plate facing the rotor assembly and are electrically connected to the Hall plate. The Hall sensors are used to detect the rotation of the rotor assembly. The side of the Hall plate facing the rotor assembly is electrically connected to the stator assembly, and the other side of the Hall plate is electrically connected to the drive board assembly through the steel pin connector.

[0024] In one embodiment, the circuit board assembly is a terminal block, with one side of the terminal block facing the stator assembly electrically connected to the stator assembly, and the other side of the terminal block electrically connected to the drive board assembly via the steel pin connector.

[0025] The technical solution of this utility model involves mounting the drive board assembly onto the connecting surface of the housing, while simultaneously embedding the circuit board assembly within the rotating cavity of the housing. Steel pin connectors are used to connect the circuit board assembly and the drive board assembly. This achieves a structure where the circuit board assembly is internal and the drive board assembly is external relative to the rotating cavity, reducing interference between the circuit board assembly and the drive board assembly, and also reducing the space occupied by the rotating cavity, thus decreasing the size of the hollow cup brushless motor. Furthermore, the external drive board assembly facilitates replacement and maintenance. Secondly, the drive board assembly is mounted on the support surface of the support ring, forming a first gap between it and the housing connecting surface. This allows adjustment of the distance between the drive board assembly and the connecting surface by adjusting the height of the support ring, thereby adapting to different installation requirements and improving installation flexibility. Finally, since the support ring and the housing are independently machined, the machining complexity of the housing is not increased. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 A schematic diagram of a hollow cup brushless motor according to an embodiment of the present invention;

[0028] Figure 2 This is a partial exploded view of a hollow cup brushless motor.

[0029] Figure 3 This is a cross-sectional view of a hollow cup brushless motor.

[0030] Figure 4 This is a partial structural diagram of a hollow cup brushless motor when the circuit board assembly is a terminal block.

[0031] Figure 5 This is a partial structural diagram of a hollow cup brushless motor when the circuit board assembly is a Hall plate.

[0032] Figure 6 This is a partial structural diagram from another perspective when the circuit board assembly of a hollow cup brushless motor is a Hall plate.

[0033] Figure 7 This is a partial structural diagram from another perspective when the circuit board assembly of a hollow cup brushless motor is a Hall plate.

[0034] Figure 8 for Figure 7 Exploded view of the middle section of the structure.

[0035] Explanation of icon numbers:

[0036] 100. Hollow Cup Brushless Motor; 1. Housing; 11. Main Body; 111. Rotating Cavity; 112. Opening; 12. Rear End Cover; 121. Connecting Surface; 122. Second Gap Space; 123. First Notch; 124. Base; 125. Lug; 126. Second Through Hole; 2. Rotor Assembly; 21. Shaft; 22. Magnetic Ring; 3. Stator Assembly; 31. Iron Core; 32. Armature Coil Cup; 4. Circuit Board Assembly; 40. Circuit Board Body; 41. Limit 42. Slot; Hall sensor; 43. Terminal block; 431. Second insertion hole; 44. First insertion hole; 45. First through hole; 5. Drive board assembly; 51. Cable; 52. Third insertion hole; 53. Positioning hole; 6. Steel pin connector; 61. First end; 62. Second end; 7. Bracket; 71. Mounting surface; 72. Baffle; 73. Limiting post; 8. Support ring; 81. First interval space; 82. Support surface; 83. Positioning post; 84. Second notch.

[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0039] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0040] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0041] Coreless brushless motors are high-performance motors characterized by their small size, light weight, high efficiency, low noise, and fast response speed. They are suitable for high-precision drive systems, such as those used in communications, robotics, security, aerospace, and steering systems.

[0042] In existing coreless brushless motors, a typical configuration includes a housing, and a stator assembly, a rotor assembly, a circuit board assembly, and a drive board assembly housed within the rotating cavity of the housing. The stator assembly is located on the inner wall of the rotating cavity and drives the rotor assembly to rotate via electromagnetic forces. The circuit board assembly is electrically connected to the stator assembly, controlling the motor's operation. The drive board assembly is electrically connected to the circuit board assembly and connects to external devices via cables. This configuration results in both the drive board assembly and the circuit board assembly being housed within the rotating cavity, leading to overcrowding, potential interference between components, and poor heat dissipation. To avoid interference, the space within the rotating cavity is typically increased; however, this increases the motor's size and cost. Furthermore, since the drive board assembly is a consumable component, its location within the rotating cavity hinders maintenance.

[0043] Furthermore, when fixing the drive board assembly, a raised structure is usually set on the housing to limit the drive board assembly for installation and to prevent interference between the drive board assembly and the housing end cover. However, this design lacks flexibility during installation, making it impossible to adjust to different drive board assemblies or installation requirements. This results in the drive board assembly not maintaining an appropriate distance from the housing end cover, thus affecting the overall assembly accuracy of the motor. Simultaneously, the process of forming the raised structure during housing machining increases the complexity of housing processing, raises the precision requirements of the molds, and increases manufacturing costs.

[0044] The main purpose of this utility model is to propose a hollow cup brushless motor 100, which aims to reduce interference between components, achieve motor miniaturization, and improve the installation flexibility of the drive board assembly 5.

[0045] Please see Figures 1 to 8 In one embodiment of this utility model, the hollow cup brushless motor 100 includes a housing 1, a rotor assembly 2, a stator assembly 3, a circuit board assembly 4, a support ring 8, a drive plate assembly 5, and a steel pin connector 6. The housing 1 has a rotating cavity 111 and a connecting surface 121 located outside the rotating cavity 111; the rotor assembly 2 is rotatably disposed in the rotating cavity 111; the stator assembly 3 is disposed on the inner wall of the rotating cavity 111 and is used to drive the rotor assembly 2 to rotate; the circuit board assembly 4 is disposed in the rotating cavity 111 and is electrically connected to the stator assembly 3; the support ring 8 is disposed circumferentially along the connecting surface 121 and has a support surface 82 facing away from the connecting surface 121; the drive plate assembly 5 is disposed on the support surface 82 so that there is a first gap space 81 between the drive plate assembly 5 and the connecting surface 121; one end of the steel pin connector 6 is electrically connected to the circuit board assembly 4, and the other end of the steel pin connector 6 is electrically connected to the drive plate assembly 5, so that the circuit board assembly 4 is electrically connected to the drive plate assembly 5 through the steel pin connector 6.

[0046] The technical solution of this utility model involves mounting the drive board assembly 5 on the connecting surface 121 of the housing 1, while simultaneously embedding the circuit board assembly 4 within the rotating cavity 111 of the housing 1. A steel pin connector 6 connects the circuit board assembly 4 and the drive board assembly 5, achieving a structure where the circuit board assembly 4 is internal and the drive board assembly 5 is external relative to the rotating cavity 111. This reduces interference between the circuit board assembly 4 and the drive board assembly 5, reduces the space occupied by the rotating cavity 111, and decreases the size of the hollow cup brushless motor 100. Furthermore, the external placement of the drive board assembly 5 facilitates replacement and maintenance. Secondly, the drive board assembly 5 is mounted on the supporting surface 82 of the support ring 8, forming a first gap space 81 between it and the connecting surface 121 of the housing 1. This allows adjustment of the distance between the drive board assembly 5 and the connecting surface 121 by adjusting the height of the support ring 8, thus adapting to different installation requirements and improving installation flexibility. Finally, since the support ring 8 and the housing 1 are independently machined, the machining complexity of the housing 1 is not increased.

[0047] Optionally, the support ring 8 can be made of aluminum alloy or plastic to improve its support strength and durability, while reducing the overall weight of the hollow cup brushless motor 100. The drive plate assembly 5 can be modularly designed according to actual needs to facilitate replacement and maintenance.

[0048] Optionally, an insulating material may be fitted on the outside of the steel pin connector 6 to prevent accidental contact between the steel pin connector 6 and other electronic components or contact terminals.

[0049] Understandably, the drive board is a consumable component. By placing it on the outside of the rotating cavity 111, it is easy to disassemble and maintain. If the drive board were built-in, when the size of the coreless brushless motor 100 is small and Hall effect control is required, the electronic components on the circuit board assembly 4 might not be able to fit. Meanwhile, the steel pin connector 6 has higher reliability than the cable 51, avoiding potential contact problems that may occur with the cable 51 during long-term use. It also simplifies the connection process, reduces space occupation, and makes the coreless brushless motor 100 more convenient to assemble and maintain.

[0050] In one implementation, please refer to Figure 3 The stator assembly 3 includes a stator core 31 and an armature coil cup 32. The stator core 31 is arranged around the inner wall of the rotating cavity 111 and abuts against the circuit board assembly 4. The armature coil cup 32 is arranged on the inner wall of the core 31 and is electrically connected to the circuit board assembly 4.

[0051] In this embodiment, the stator core 31 is typically made of silicon steel sheets stacked into a ring and mounted on the inner wall of the rotating cavity 111 to generate a magnetic field. The armature coil cup 32 is mounted on the inner side of the stator core 31 and is typically composed of multiple windings to conduct current and interact with the magnetic field of the rotor assembly 2.

[0052] In one implementation, please refer to Figure 3 The rotor assembly 2 includes a rotating shaft 21 disposed in the rotating cavity 111 and a magnetic ring 22 sleeved on the rotating shaft 21.

[0053] In this embodiment, the rotating shaft 21 is rotatably disposed within the rotating cavity 111 to support the magnetic ring 22 and transmit torque. The magnetic ring 22 is sleeved on the rotating shaft 21 and is typically made of permanent magnet material. It is used to generate a rotating magnetic field and interact with the armature coil of the stator assembly 3 to drive the rotating shaft 21 to rotate.

[0054] In one implementation, please refer to Figure 1 and Figure 2 The support ring 8 is provided with a positioning post 83 protruding from the support surface 82, and the drive plate assembly 5 is provided with a positioning hole 53 corresponding to the positioning post 83. The drive plate assembly 5 is supported on the support surface 82, and the positioning post 83 is limited to the positioning hole 53.

[0055] In this embodiment, when the drive plate assembly 5 is installed on the support surface 82, the positioning pin 83 is inserted into the positioning hole 53, thereby achieving stable support and limiting contact of the drive plate assembly 5 on the support ring 8. This ensures the positional accuracy of the drive plate assembly 5 during installation, prevents displacement or shaking during operation, and improves the reliability of the hollow cup brushless motor 100.

[0056] Optionally, the positioning post 83 can be configured in various shapes, such as cylindrical, square, or with external threads, to adapt to different positioning requirements. The shape and size of the positioning hole 53 match the positioning post 83 to ensure a tight connection. Furthermore, an interference fit can be used between the positioning post 83 and the positioning hole 53 to enhance the stability of the connection. Understandably, the cooperation between the positioning post 83 and the positioning hole 53 simplifies the installation process of the drive board assembly 5 and improves installation efficiency.

[0057] In one implementation, please refer to Figure 1 and Figure 2 A cable 51 is provided on the side of the drive board assembly 5 facing away from the support surface 82. The cable 51 and the steel needle connector 6 are symmetrically arranged on both sides of the drive board assembly 5. The cable 51 is used to connect with other devices. There are two positioning posts 83, which are spaced apart on the support surface 82. The drive board assembly 5 has a positioning hole 53 for each positioning post 83. Along the circumferential direction of the drive board assembly 5, the distance between the two positioning posts 83 and the cable 51 is equal.

[0058] In this embodiment, two positioning posts 83 are symmetrically arranged on both sides of the support surface 82 along the radial direction of the support surface 82 to balance the force between the drive plate assembly 5 and the support ring 8, ensuring the stability of the drive plate assembly 5 during operation. A cable 51 is provided on the side of the drive plate assembly 5 away from the support surface 82. The cable 51 and the steel needle connector 6 are symmetrically arranged on both sides of the drive plate assembly 5, which can also balance the force.

[0059] Understandably, this not only improves the aesthetics of the hollow cup brushless motor 100 but also optimizes the spatial layout, preventing the cable 51 from contacting the steel pin connector 6 and ensuring orderly circuit flow. Furthermore, the equal distance between the two positioning posts 83 and the cable 51 creates a symmetrical arrangement, enhancing structural stability and ensuring that the drive board assembly 5 is evenly stressed after installation, reducing the risk of loosening due to uneven stress. Simultaneously, the symmetrical arrangement facilitates positioning and installation during production and assembly, improving production efficiency.

[0060] In one implementation, please refer to Figure 7 and Figure 8 The circuit board assembly 4 includes a circuit board body 40 and a terminal frame 43. The circuit board body 40 is disposed in the rotating cavity 111 and is electrically connected to the stator assembly 3. The terminal frame 43 is disposed on the side of the circuit board body 40 facing away from the stator assembly 3. One end of the steel pin connector 6 is inserted into the terminal frame 43 and is electrically connected to the circuit board body 40.

[0061] In this embodiment, the circuit board body 40 is located within the rotating cavity 111 and is electrically connected to the stator assembly 3. It is used to control the operation of the stator assembly 3, thereby driving the rotor assembly 2 to rotate. The terminal frame 43 is mounted on the circuit board body 40, serving as a connector and support. One end of the steel pin connector 6 is inserted into the terminal frame 43 to achieve an electrical connection with the circuit board body 40, ensuring stable signal transmission.

[0062] Optionally, the terminal block 43 may be made of insulating material to prevent electrical short circuits, and may also be designed to have a certain degree of elasticity to provide appropriate clamping force when the steel pin connector 6 is inserted, thereby enhancing the stability of the connection.

[0063] Understandably, the terminal block 43 provides a stable mounting platform for the steel pin connector 6, which helps to improve the robustness of the connection between the circuit board assembly 4 and the drive board assembly 5. At the same time, the terminal block 43 also facilitates the insertion, removal, and replacement of the steel pin connector 6, making maintenance of the hollow cup brushless motor 100 easier.

[0064] In one implementation, please refer to Figure 8 The steel needle connector 6 has a first end 61 and a second end 62 disposed opposite to each other. The first end 61 is welded to the drive plate assembly 5; or, the first end 61 is detachably connected to the drive plate assembly 5.

[0065] In this embodiment, the steel pin connector 6 has a first end 61 and a second end 62 disposed opposite to each other. The first end 61 is used to connect to the drive board assembly 5. Depending on actual needs, the first end 61 can be welded to the drive board assembly 5. This connection is strong and can withstand large currents and high-frequency signal transmissions, but it is not easy to disassemble once connected. Alternatively, a detachable connection, such as a plug-in or threaded connection, can be used to facilitate subsequent maintenance and replacement.

[0066] In one implementation, please refer to Figure 8 The second end 62 is soldered to the circuit board body 40; or, the second end 62 is detachably connected to the circuit board body 40.

[0067] In this embodiment, the second end 62 of the steel pin connector 6 is used to connect to the circuit board body 40. Similarly, the second end 62 can be connected by soldering to form a firm electrical connection with the circuit board body 40, ensuring the stability of signal transmission. Alternatively, a detachable connection can be used, such as connecting to the circuit board body 40 via a plug or connector, so that it can be quickly disassembled and reinstalled when needed, facilitating maintenance of the circuit board assembly 4.

[0068] In one implementation, please refer to Figure 8The terminal block 43 is located on the side of the circuit board body 40 facing the drive board assembly 5. The circuit board body 40 has a first insertion hole 44, the terminal block 43 has a second insertion hole 431, and the drive board assembly 5 has a third insertion hole 52. The first insertion hole 44, the second insertion hole 431, and the third insertion hole 52 are coaxially arranged. The first end 61 of the steel pin connector 6 is inserted into the third insertion hole 52 and electrically connected to the drive board assembly 5. The second end 62 is sequentially inserted into the second insertion hole 431 and the first insertion hole 44 and electrically connected to the circuit board body 40.

[0069] In this embodiment, to achieve a stable connection between the steel pin connector 6 and the circuit board body 40 and the drive board assembly 5, a terminal frame 43 is provided between the circuit board body 40 and the drive board assembly 5, serving as a connection and support. The circuit board body 40, the terminal frame 43, and the drive board assembly 5 are respectively provided with a first insertion hole 44, a second insertion hole 431, and a third insertion hole 52, and these three insertion holes are coaxially arranged to ensure that the steel pin connector 6 can be smoothly inserted and electrically connected. The first end 61 of the steel pin connector 6 is inserted into the third insertion hole 52 of the drive board assembly 5 and electrically connected thereto. Simultaneously, the second end 62 passes through the first insertion hole 44 of the circuit board body 40 and the second insertion hole 431 of the terminal frame 43 in sequence, achieving an electrical connection with the circuit board body 40.

[0070] In one implementation, please refer to Figure 8 The steel needle connector 6 is provided with multiple first insertion holes 44, second insertion holes 431 and third insertion holes 52, wherein each steel needle connector 6 corresponds to a first insertion hole 44, a second insertion hole 431 and a third insertion hole 52.

[0071] In this embodiment, multiple steel needle connectors 6 are designed, and correspondingly, multiple first insertion holes 44, second insertion holes 431, and third insertion holes 52 are also provided. Each steel needle connector 6 corresponds to one first insertion hole 44, one second insertion hole 431, and one third insertion hole 52, respectively, ensuring that each connection point can achieve a stable electrical connection, thereby ensuring the normal operation of the hollow cup brushless motor 100 and the reliability of signal transmission.

[0072] In one implementation, please refer to Figure 1 and Figure 2 The connecting surface 121 has a first notch 123 that communicates with the rotating cavity 111. The first notch 123 connects the rotating cavity 111 and the first interval space 81. The first notch 123 is correspondingly arranged with the terminal frame 43 so that the other end of the steel needle connector 6 passes through the first notch 123 and is electrically connected to the drive board assembly 5.

[0073] In this embodiment, a first notch 123 communicating with the rotating cavity 111 is also provided on the connecting surface 121. The position of the terminal frame 43 corresponds to the first notch 123, so that the steel pin connector 6 can pass smoothly through the first notch 123 to realize the electrical connection between the circuit board assembly 4 and the drive board assembly 5.

[0074] Understandably, the guiding effect of the first notch 123 allows the steel needle connector 6 to be led out from the same point, which facilitates the installation of the steel needle connector 6 and improves the assembly efficiency.

[0075] Optionally, the first notch 123 can be located in the middle region of the connecting surface 121. In this case, the first notch 123 directly connects the rotating cavity 111 and the first interval space 81, allowing one end of the steel needle connector 6 to extend from the rotating cavity 111, pass through the first notch 123 and the first interval space 81, and directly connect to the drive board assembly 5. At this time, the steel needle connector 6 is located inside the support ring 8. Although this allows for electrical connection between the drive board assembly 5 and the circuit board assembly 4, the heat dissipation performance is poor.

[0076] In one implementation, please refer to Figure 1 , Figure 2 and Figure 8 The first notch 123 is located at the periphery of the connecting surface 121, and the support ring 8 is provided with a second notch 84 corresponding to the first notch 123.

[0077] In this embodiment, the first notch 123 is located at the periphery of the connecting surface 121, and the second notch 84 on the support ring 8 communicates with the first gap space 81. The corresponding arrangement of the first notch 123, the second notch 84, and the terminal frame 43 allows the steel pin connector 6 to start from the terminal frame 43, pass through the second notch 84 and the first notch 123 in sequence, and finally achieve electrical connection with the drive board assembly 5. Understandably, this arrangement, while achieving electrical connection, also allows the steel pin connector 6 to fully contact the external environment, improving heat dissipation performance.

[0078] In one implementation, please refer to Figure 2 and Figure 3 The housing 1 includes a main body 11 and a rear end cover 12. The main body 11 forms a rotating cavity 111 and an opening 112 communicating with the rotating cavity 111. The rear end cover 12 is disposed in the opening 112, and a connecting surface 121 is formed on the side of the rear end cover 12 facing away from the rotating cavity 111.

[0079] In this embodiment, the main body 11 of the housing 1 forms a rotating cavity 111 for accommodating the rotor assembly 2 and the stator assembly 3. The rear end cover 12 is installed at the opening 112 of the main body 11, and the side of the rear end cover 12 facing away from the rotating cavity 111 forms a connecting surface 121 for mounting the drive plate assembly 5.

[0080] Optionally, the main body 11 and the rear cover 12 can be fixed by means of threaded connection, snap-fit ​​connection or welding to ensure the overall strength and sealing of the housing 1.

[0081] In one implementation, please refer to Figure 3 , Figure 7 and Figure 8 The hollow cup brushless motor 100 also includes a bracket 7 disposed on the inner wall of the rotating cavity 111. One side of the bracket 7 abuts against the stator assembly 3, and the other side of the bracket 7 forms a mounting surface 71. The bracket 7 is provided with a baffle 72 protruding from the mounting surface 71. The circuit board assembly 4 is supported on the mounting surface 71. The baffle 72 is limited and abuts against the terminal frame 43 and is correspondingly disposed with the first notch 123.

[0082] In this embodiment, the bracket 7 is installed on the inner wall of the rotating cavity 111. One side of the bracket 7 abuts against the stator assembly 3, and the other side forms a mounting surface 71 for fixing and mounting the circuit board assembly 4. The baffle 72 corresponds to the first notch 123 of the rear end cover 12 and is used to prevent the steel pin connector 6 from shifting during operation and accidentally contacting other electronic components or contact terminals.

[0083] In one implementation, please refer to Figure 4 and Figure 8 The bracket 7 has multiple limiting posts 73 circumferentially, and the circuit board body 40 has multiple limiting grooves 41 circumferentially, with each limiting post 73 corresponding to a limiting groove 41. When the circuit board body 40 is supported on the mounting surface 71, the limiting posts 73 are inserted into the limiting grooves 41, and along the circumferential direction of the circuit board body 40, the limiting posts 73 are aligned with the outer sidewall of the circuit board body 40.

[0084] In this embodiment, the bracket 7 is provided with multiple limiting posts 73 in the circumferential direction, and the circuit board assembly 4 is provided with multiple limiting grooves 41 in the circumferential direction, with each corresponding to the other. When the circuit board assembly 4 is installed on the mounting surface 71 of the bracket 7, the limiting posts 73 are inserted into the limiting grooves 41 to ensure the circuit board assembly 4 is fixed and to prevent the circuit board assembly 4 from shifting during operation.

[0085] Understandably, the alignment of the limiting post 73 with the outer wall of the circuit board body 40 further enhances the compactness of the structure and reduces the volume occupied.

[0086] Alternatively, the limiting post 73 can also be configured as a flexible snap-fit, which facilitates installation and removal.

[0087] In one implementation, please refer to Figure 8The circuit board body 40 has a first through hole 45, and the rear end cover 12 has a second through hole 126 corresponding to the first through hole 45. A bearing is provided in the second through hole 126, and one end of the rotating shaft 21 is movably inserted through the first through hole 45 and the second through hole 126. The bearing is sleeved on the outer wall of the rotating shaft 21.

[0088] In this embodiment, the circuit board body 40 has a first through hole 45, while the rear end cover 12 has a corresponding second through hole 126. A bearing is installed inside the second through hole 126, and the inner ring of the bearing is tightly fitted with the outer wall of the rotating shaft 21. One end of the rotating shaft 21 passes through the first through hole 45 and the second through hole 126 in sequence and can rotate freely within them. In this way, the friction between the rotating shaft 21 and the rear end cover 12 is reduced by the support of the bearing, thereby improving the operating efficiency of the motor.

[0089] In one implementation, please refer to Figure 7 and Figure 8 The rear cover 12 includes a base portion 124 and a hook portion 125 located at one end of the base portion 124. The base portion 124 is inserted into the rotating cavity 111 so that the hook portion 125 abuts against the opening 112 of the main body portion 11. A connecting surface 121 is formed on the side of the base portion 124 facing away from the rotating cavity 111. A second gap space 122 is provided between the side of the base portion 124 away from the hook portion 125 and the circuit board body 40.

[0090] In this embodiment, the rear end cover 12 includes a base portion 124 and a hook portion 125. The base portion 124 is inserted into the rotating cavity 111, and the hook portion 125 can just abut against the opening 112 of the main body portion 11, thereby ensuring that the rear end cover 12 can fit tightly against the main body portion 11. A connecting surface 121 is formed on the side of the base portion 124 facing away from the rotating cavity 111 for mounting the drive board assembly 5. A second gap space 122 is provided between the circuit board assembly 4 and the rear end cover 12 to prevent electronic components or contact terminals on the circuit board assembly 4 from contacting the rear end cover 12, thereby causing a short circuit. At the same time, the second gap space 122 also facilitates the installation of the hollow cup brushless motor 100.

[0091] In one implementation, please refer to Figure 5 and Figure 6 The circuit board assembly 4 is a Hall plate, which is equipped with multiple Hall sensors 42. The multiple Hall sensors 42 are located on the side of the Hall plate facing the rotor assembly 2 and are electrically connected to the Hall plate. The Hall sensors 42 are used to detect the rotation of the rotor assembly 2. The side of the Hall plate facing the rotor assembly 2 is electrically connected to the stator assembly 3, and the other side of the Hall plate is electrically connected to the drive board assembly 5 through the steel pin connector 6.

[0092] In this embodiment, when the circuit board assembly 4 is a Hall plate, the Hall sensor 42 is located on the side of the Hall plate facing the rotor assembly 2, and is used to detect the rotation state of the rotor assembly 2. The other side of the Hall plate is electrically connected to the drive board assembly 5 through the steel pin connector 6 to realize signal transmission.

[0093] Understandably, at this time, eight steel pin connectors 6 can be set to connect the Hall plate and the drive board assembly 5. Among them, three steel pin connectors 6 are used to transmit the current signal of the armature coil cup 32, and five steel pin connectors 6 are used to transmit the rotor rotation signal detected by the Hall sensor 42 and provide power to the Hall sensor 42.

[0094] In one implementation, please refer to Figure 4 The circuit board assembly 4 is a terminal block. The side of the terminal block facing the stator assembly 3 is electrically connected to the stator assembly 3, and the other side of the terminal block is electrically connected to the drive board assembly 5 through the steel pin connector 6.

[0095] In this embodiment, when the circuit board assembly 4 is a terminal block, the terminal block is used to realize the electrical connection between the stator assembly 3 and the drive board assembly 5. One side of the terminal block is electrically connected to the stator assembly 3, and the other side is electrically connected to the drive board assembly 5 through the steel pin connector 6.

[0096] Understandably, at this time, three steel pin connectors 6 can be set to connect the terminal block and the drive board assembly 5. The three steel pin connectors 6 are used to transmit the current signal of the armature coil cup 32.

[0097] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A hollow cup brushless motor, characterized in that, The hollow cup brushless motor includes: A housing, wherein the housing is provided with a rotating cavity and a connecting surface located on the outer side of the rotating cavity; A rotor assembly, wherein the rotor assembly is rotatably disposed within the rotating cavity; A stator assembly, disposed on the inner wall of the rotating cavity, is used to drive the rotor assembly to rotate; A circuit board assembly, wherein the circuit board assembly is disposed within the rotating cavity and is electrically connected to the stator assembly; A support ring, the support ring being arranged circumferentially along the connecting surface and having a support surface facing away from the connecting surface; A drive plate assembly, wherein the drive plate assembly is disposed on the support surface such that a first gap space exists between the drive plate assembly and the connecting surface; and A steel pin connector, one end of which is electrically connected to the circuit board assembly and the other end of which is electrically connected to the drive board assembly, so that the circuit board assembly is electrically connected to the drive board assembly through the steel pin connector.

2. The hollow cup brushless motor as described in claim 1, characterized in that, The support ring is provided with a positioning post protruding from the support surface, the drive plate assembly is provided with a positioning hole corresponding to the positioning post, the drive plate assembly is supported on the support surface, and the positioning post is limited to the positioning hole.

3. The hollow cup brushless motor as described in claim 2, characterized in that, The drive board assembly has a cable on the side facing away from the support surface. The cable and the steel pin connector are symmetrically arranged on both sides of the drive board assembly. The cable is used to connect with other devices. The positioning post includes two posts, which are spaced apart on the support surface. The drive board assembly has a positioning hole for each positioning post. The distance between the two positioning posts and the cable is equal along the circumferential direction of the drive board assembly.

4. The hollow cup brushless motor as described in claim 1, characterized in that, The circuit board assembly includes a circuit board body and a terminal frame. The circuit board body is disposed in the rotating cavity and is electrically connected to the stator assembly. The terminal frame is disposed on the side of the circuit board body facing away from the stator assembly. One end of the steel pin connector is inserted into the terminal frame and electrically connected to the circuit board body.

5. The hollow cup brushless motor as described in claim 4, characterized in that, The connecting surface has a first notch that communicates with the rotating cavity. The first notch connects the rotating cavity and the first interval space. The first notch is correspondingly arranged with the terminal frame so that the other end of the steel pin connector passes through the first notch and is electrically connected to the drive board assembly.

6. The hollow cup brushless motor as described in claim 5, characterized in that, The first notch is located at the periphery of the connecting surface, and the support ring has a second notch corresponding to the first notch.

7. The hollow cup brushless motor as described in claim 5, characterized in that, The hollow cup brushless motor also includes a bracket disposed on the inner wall of the rotating cavity. One side of the bracket abuts against the stator assembly, and the other side of the bracket forms a mounting surface. The bracket is provided with a baffle protruding from the mounting surface. The circuit board assembly is supported on the mounting surface. The baffle abuts against the terminal frame and is correspondingly disposed to the first notch.

8. The hollow cup brushless motor as described in claim 1, characterized in that, The housing includes a main body and a rear end cover. The main body has the rotating cavity and an opening communicating with the rotating cavity. The rear end cover is disposed in the opening, and the side of the rear end cover facing away from the rotating cavity forms the connecting surface.

9. The hollow cup brushless motor according to any one of claims 1 to 8, characterized in that, The circuit board assembly is a Hall plate, which is provided with multiple Hall sensors. The multiple Hall sensors are located on the side of the Hall plate facing the rotor assembly and are electrically connected to the Hall plate. The Hall sensors are used to detect the rotation of the rotor assembly. The side of the Hall plate facing the rotor assembly is electrically connected to the stator assembly, and the other side of the Hall plate is electrically connected to the drive board assembly through the steel pin connector.

10. The hollow cup brushless motor according to any one of claims 1 to 8, characterized in that, The circuit board assembly is a terminal block. The side of the terminal block facing the stator assembly is electrically connected to the stator assembly, and the other side of the terminal block is electrically connected to the drive board assembly through the steel pin connector.

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