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 drive board assembly and a steel needle connecting piece, the casing is provided with a rotating cavity and a connecting surface located at the outer side of the rotating cavity, the rotor assembly is rotatably arranged in the rotating cavity, and the stator assembly is rotatably arranged in the connecting surface. The stator assembly is arranged on the inner wall of the rotating cavity and used for driving the rotor assembly to rotate, the circuit board assembly comprises a circuit board body and a terminal frame arranged on the circuit board body, the circuit board body is arranged in the rotating cavity and electrically connected with the stator assembly, the driving board assembly is arranged on the connecting face, and one end of the steel needle connecting piece is arranged on the terminal frame and connected with the circuit board body. And the other end of the steel needle connecting piece is connected with the driving plate assembly, so that the circuit board body 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 reliability of connection between the circuit board assembly and the driving board assembly is improved, and the problem of poor contact during connection is solved.

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 lightweight and compact. During operation, they can achieve high speed and efficiency, and run smoothly with low noise. They are often used in systems with high precision and performance requirements, such as communications, robotics, security, aerospace, and steering control systems.

[0003] Existing coreless brushless motors typically consist of a driver board and a circuit board. The driver board is used for motor drive control, generating corresponding drive current based on received signals to enable the motor to operate normally. The circuit board is used for signal processing and logic control, such as adjusting the motor speed and controlling the direction. The two work together to enable the coreless brushless motor to operate stably according to the set working mode.

[0004] When connecting circuit boards and driver boards, cables are generally used. However, cable connections present several problems. First, cable routing is complex and requires careful planning to avoid messy wiring and incorrect connections. Second, cable connections have relatively low reliability; over long-term use, poor contact may occur, affecting the normal operation of the motor. Utility Model Content

[0005] The main purpose of this invention is to propose a hollow cup brushless motor, which aims to improve the reliability of the connection between the circuit board assembly and the drive board assembly and solve the problem of poor contact during connection.

[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, the circuit board assembly including a circuit board body and a terminal frame disposed on the circuit board body, the circuit board body being disposed in the rotating cavity and electrically connected to the stator assembly;

[0011] A drive board assembly, wherein the drive board assembly is disposed on the connection surface; and

[0012] A steel pin connector, one end of which is disposed on the terminal frame and electrically connected to the circuit board body, and the other end of which is electrically connected to the drive board assembly, so that the circuit board body is electrically connected to the drive board assembly through the steel pin connector.

[0013] In one embodiment, the steel needle connector has a first end and a second end disposed opposite to each other;

[0014] Wherein, the first end is welded to the drive board assembly; or, the first end is detachably connected to the drive board assembly;

[0015] And / or, the second end is soldered to the circuit board body; or, the second end is detachably connected to the circuit board body.

[0016] In one embodiment, the terminal block is located on the side of the circuit board body facing the drive board assembly. The circuit board body is provided with a first insertion hole, the terminal block is provided with a second insertion hole, and the drive board assembly is provided with a third insertion hole. The first insertion hole, the second insertion hole, and the third insertion hole are coaxially arranged.

[0017] The first end is inserted into the third connector and electrically connected to the drive board assembly; the second end is sequentially inserted into the second connector and the first connector and electrically connected to the circuit board body.

[0018] In one embodiment, the steel needle connector is provided with multiple holes, and the first insertion hole, the second insertion hole, and the third insertion hole are all provided with multiple holes;

[0019] Each of the steel pin connectors corresponds to a first insertion hole, a second insertion hole, and a third insertion hole; and / or, the terminal frame is arranged along the periphery of the circuit board body, and a plurality of second insertion holes are arranged along the circumference of the terminal frame.

[0020] 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 at the opening, and the connecting surface is formed on the side of the rear end cover facing away from the rotating cavity. The rear end cover has a notch communicating with the rotating cavity. The terminal bracket corresponds to the notch so that the steel needle passes through the 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 body is supported on the mounting surface. The baffle abuts against the terminal block and corresponds to the notch.

[0022] In one embodiment, the rear end cover includes a base portion and a hook portion disposed at one end of the base portion. The base portion is inserted into the rotating cavity so that the hook portion abuts against the opening of the main body portion. The side of the base portion facing away from the rotating cavity forms the connecting surface.

[0023] Wherein, a first gap space is provided between the side of the base portion away from the ear portion and the circuit board body.

[0024] In one embodiment, the bracket is provided with a plurality of limiting posts in the circumferential direction, and the circuit board body is provided with a plurality of limiting grooves in the circumferential direction, and each of the limiting posts corresponds to a limiting groove.

[0025] When the circuit board body is supported on the mounting surface, the limiting post is inserted into the limiting groove and aligned with the outer wall of the circuit board body along the circumferential direction of the circuit board body.

[0026] In one embodiment, the circuit board body is a Hall plate, and the Hall plate 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.

[0027] In one embodiment, the circuit board body 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.

[0028] The technical solution of this utility model achieves electrical connection between the circuit board assembly and the drive board assembly by placing the circuit board body inside the rotating cavity and electrically connecting it to the stator assembly, and placing the drive board assembly on the connecting surface of the housing. One end of the steel pin connector is connected to the circuit board body, and the other end is connected to the drive board assembly. Simultaneously, fixing one end of the steel pin connector with a terminal bracket not only prevents misalignment during installation but also provides positioning and insulation. Compared to cables, the steel pin connector offers higher reliability, avoiding potential contact problems that may occur with cables during long-term use. It also simplifies the connection process, reduces space occupation, and makes the assembly and maintenance of the hollow cup brushless motor more convenient. Attached Figure Description

[0029] 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.

[0030] Figure 1 A schematic diagram of a hollow cup brushless motor according to an embodiment of the present invention;

[0031] Figure 2 This is a cross-sectional view of a hollow cup brushless motor.

[0032] Figure 3 This is a partial structural diagram of a hollow cup brushless motor when the circuit board body is a terminal block.

[0033] Figure 4 This is a partial structural diagram of a hollow cup brushless motor when the circuit board body is a Hall plate.

[0034] Figure 5 This is a partial structural diagram from another perspective when the circuit board body of a hollow cup brushless motor is a Hall plate.

[0035] Figure 6 This is a partial structural diagram from another perspective when the circuit board body of a hollow cup brushless motor is a Hall plate.

[0036] Figure 7 for Figure 6 Exploded view of the middle section of the structure.

[0037] Explanation of icon numbers:

[0038] 100. Hollow Cup Brushless Motor; 1. Housing; 11. Main Body; 111. Rotating Cavity; 112. Opening; 12. Rear End Cover; 121. Connecting Surface; 122. First Gap Space; 123. 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; 44. First insertion hole; 45. First through hole; 41. Limiting groove; 42. Hall sensor; 43. Terminal block; 431. Second insertion hole; 5. Drive board assembly; 51. Cable; 52. Third insertion 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. Second interval space.

[0039] 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

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Coreless brushless motors are lightweight and compact. During operation, they can achieve high speed and efficiency, and run smoothly with low noise. They are often used in systems with high precision and performance requirements, such as communications, robotics, security, aerospace, and steering control systems.

[0044] Existing coreless brushless motors typically consist of a driver board and a circuit board. The driver board is used for motor drive control, generating corresponding drive current based on received signals to enable the motor to operate normally. The circuit board is used for signal processing and logic control, such as adjusting the motor speed and controlling the direction. The two work together to enable the coreless brushless motor to operate stably according to the set working mode.

[0045] When connecting circuit boards and driver boards, cables are generally used. However, cable connections present several problems. First, cable routing is complex and requires careful planning to avoid messy wiring and incorrect connections. Second, cable connections have relatively low reliability; over long-term use, poor contact may occur, affecting the normal operation of the motor.

[0046] The main purpose of this utility model is to propose a hollow cup brushless motor 100, which aims to improve the reliability of the connection between the circuit board assembly 4 and the drive board assembly 5 and solve the problem of poor contact during connection.

[0047] Please see Figures 1 to 7 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 drive board 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 within 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 includes a circuit board body 40 and a terminal frame 43 disposed on the circuit board body 40. The circuit board body 40 is disposed within the rotating cavity 111 and is electrically connected to the stator assembly 3. The drive board assembly 5 is disposed on the connecting surface 121. One end of the steel pin connector 6 is disposed on the circuit board body 40 and electrically connected to the circuit board body 40, and the other end of the steel pin connector 6 is electrically connected to the drive board assembly 5, so that the circuit board body 40 is electrically connected to the drive board assembly 5 through the steel pin connector 6.

[0048] The technical solution of this utility model achieves electrical connection between the circuit board assembly 4 and the drive board assembly 5 by placing the circuit board body 40 in the rotating cavity 111 and electrically connecting it to the stator assembly 3, placing the drive board assembly 5 on the connecting surface 121 of the housing 1, and connecting one end of the steel pin connector 6 to the circuit board body 40 and the other end to the drive board assembly 5. Simultaneously, fixing one end of the steel pin connector 6 with the terminal bracket 43 not only prevents the steel pin connector 6 from tilting during installation but also provides positioning and insulation. Compared to the cable 51, the steel pin connector 6 has higher reliability, 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 hollow cup brushless motor 100 more convenient to assemble and maintain.

[0049] In this embodiment, the housing 1 serves as the supporting structure for the hollow cup brushless motor 100. Its internal rotating cavity 111 provides space for the rotation of the rotor assembly 2, while the connecting surface 121 provides a location for the installation of the drive board assembly 5. The rotor assembly 2 can rotate freely within the rotating cavity 111. The stator assembly 3 is fixed to the inner wall of the rotating cavity 111 and drives the rotor assembly 2 to rotate by generating a rotating magnetic field. The circuit board body 40 of the circuit board assembly 4 is disposed within the rotating cavity 111 and electrically connected to the stator assembly 3, enabling control and drive of the stator assembly 3. The drive board assembly 5 is mounted on the connecting surface 121 of the housing 1 and electrically connected to the circuit board body 40 via a steel pin connector 6, thereby transmitting drive signals to the circuit board assembly 4 to control the operation of the hollow cup brushless motor 100.

[0050] 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.

[0051] 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.

[0052] Understandably, the drive board is a consumable component, and its placement on the outside of the rotating cavity 111 facilitates disassembly and maintenance. If the drive board were internal, and the hollow cup brushless motor 100 is small in size while Hall effect control is required, the electronic components on the circuit board assembly 4 might not be able to fit.

[0053] In one implementation, please refer to Figure 7 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.

[0054] 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.

[0055] In one implementation, please refer to Figure 7 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.

[0056] 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.

[0057] In one implementation, please refer to Figure 7 The 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.

[0058] 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.

[0059] In one implementation, please refer to Figure 7The 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.

[0060] 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.

[0061] In one implementation, please refer to Figure 5 and Figure 7 Terminal frame 43 is arranged along the periphery of circuit board body 40, and multiple second insertion holes 431 are arranged along the periphery of terminal frame 43.

[0062] In this embodiment, the terminal frame 43 is arranged along the periphery of the circuit board body 40, which makes full use of the space of the circuit board body 40 and improves space utilization. At the same time, multiple second insertion holes 431 are evenly arranged along the circumference of the terminal frame 43, so that the steel pin connectors 6 can be evenly distributed on the circuit board body 40, thereby achieving a more balanced electrical connection and signal distribution, which helps to improve the reliability of the hollow cup brushless motor 100.

[0063] In one implementation, please refer to Figure 2 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.

[0064] 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.

[0065] In one implementation, please refer to Figure 2 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.

[0066] 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.

[0067] In one implementation, please refer to Figure 2 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 at 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. The rear end cover 12 has a notch 123 communicating with the rotating cavity 111. The terminal frame 43 corresponds to the notch 123 so that the steel needle connector 6 passes through the notch 123.

[0068] 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. A rear end cover 12 is installed at the opening 112 of the main body 11. The side of the rear end cover 12 facing away from the rotating cavity 111 forms a connecting surface 121 for mounting the drive board assembly 5. A notch 123 communicating with the rotating cavity 111 is also provided on the rear end cover 12. The position of the terminal bracket 43 corresponds to the notch 123, allowing the steel pin connector 6 to pass smoothly through the notch 123, thus achieving electrical connection between the circuit board assembly 4 and the drive board assembly 5.

[0069] 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.

[0070] In one implementation, please refer to Figure 2 and Figure 6 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 body 40 is supported on the mounting surface 71. The baffle 72 abuts against the terminal frame 43 and corresponds to the notch 123.

[0071] 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 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.

[0072] In one implementation, please refer to Figure 6 and Figure 7The 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 first 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.

[0073] 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 housing 1. 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 first 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 first gap space 122 also facilitates the installation of the hollow cup brushless motor 100.

[0074] In one implementation, please refer to 1 and Figure 2 The hollow cup brushless motor 100 also includes a support ring 8 disposed on the connecting surface 121, and a second gap space 81 is formed between the support ring 8 and the connecting surface 121. The drive plate assembly 5 is limited to the support ring 8.

[0075] In this embodiment, the support ring 8 is disposed on the connecting surface 121, and the drive board assembly 5 is mounted on the support ring 8, so that a second gap space 81 is formed between the drive board assembly 5 and the connecting surface 121, thereby preventing the drive board assembly 5 from directly contacting the rear cover 12 and avoiding short circuit.

[0076] In one implementation, please refer to Figure 3 and Figure 7 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.

[0077] 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.

[0078] 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.

[0079] Alternatively, the limiting post 73 can also be configured as a flexible snap-fit, which facilitates installation and removal.

[0080] In one implementation, please refer to Figure 7 The 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.

[0081] 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.

[0082] In one implementation, please refer to Figure 1 A cable 51 is provided on the side of the drive board assembly 5 facing away from the connection surface 121. 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.

[0083] In this embodiment, the drive board assembly 5 is provided with a cable 51 on the side facing away from the connection surface 121 for connecting with other devices to realize the transmission of signals or power.

[0084] Understandably, the cable 51 and the steel pin connector 6 are symmetrically arranged on both sides of the drive board assembly 5, thereby optimizing the spatial layout, avoiding contact between the cable 51 and the steel pin connector 6, and ensuring the orderly flow of the circuit.

[0085] In one implementation, please refer to Figure 4 and Figure 5 The circuit board body 40 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.

[0086] In this embodiment, when the circuit board body 40 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.

[0087] 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.

[0088] In one implementation, please refer to Figure 2 and Figure 3 The circuit board body 40 is a wiring board. The side of the wiring board facing the stator assembly 3 is electrically connected to the stator assembly 3, and the other side of the wiring board is electrically connected to the drive board assembly 5 through the steel pin connector 6.

[0089] In this embodiment, when the circuit board body 40 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.

[0090] 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.

[0091] 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, the circuit board assembly including a circuit board body and a terminal frame disposed on the circuit board body, the circuit board body being disposed in the rotating cavity and electrically connected to the stator assembly; A drive board assembly, wherein the drive board assembly is disposed on the connection surface; and A steel pin connector, one end of which is disposed on the terminal frame and electrically connected to the circuit board body, and the other end of which is electrically connected to the drive board assembly, so that the circuit board body 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 steel needle connector has a first end and a second end that are disposed opposite to each other; Wherein, the first end is welded to the drive board assembly; or, the first end is detachably connected to the drive board assembly; And / or, the second end is soldered to the circuit board body; or, the second end is detachably connected to the circuit board body.

3. The hollow cup brushless motor as described in claim 2, characterized in that, The terminal block is located on the side of the circuit board body facing the drive board assembly. The circuit board body is provided with a first insertion hole, the terminal block is provided with a second insertion hole, and the drive board assembly is provided with a third insertion hole. The first insertion hole, the second insertion hole, and the third insertion hole are coaxially arranged. The first end is inserted into the third connector and electrically connected to the drive board assembly; the second end is sequentially inserted into the second connector and the first connector and electrically connected to the circuit board body.

4. The hollow cup brushless motor as described in claim 3, characterized in that, The steel needle connector is provided with multiple parts, and the first insertion hole, the second insertion hole and the third insertion hole are all provided with multiple parts; Each of the steel pin connectors corresponds to a first insertion hole, a second insertion hole, and a third insertion hole; and / or, the terminal frame is arranged along the periphery of the circuit board body, and a plurality of second insertion holes are arranged along the circumference of the terminal frame.

5. The hollow cup brushless motor as described in claim 3, characterized in that, The housing includes a main body and a rear end cover. The main body has a rotating cavity and an opening communicating with the rotating cavity. The rear end cover is disposed at the opening, and the side of the rear end cover facing away from the rotating cavity forms the connecting surface. The rear end cover has a notch communicating with the rotating cavity. The terminal bracket corresponds to the notch so that the steel needle connector passes through the notch.

6. 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 body is supported on the mounting surface. The baffle abuts against the terminal frame and corresponds to the notch.

7. The hollow cup brushless motor as described in claim 6, characterized in that, The rear end cover includes a base portion and a hanging ear portion disposed at one end of the base portion. The base portion is inserted into the rotating cavity so that the hanging ear portion abuts against the opening of the main body portion. The side of the base portion facing away from the rotating cavity forms the connecting surface. Wherein, a first gap space is provided between the side of the base portion away from the ear portion and the circuit board body.

8. The hollow cup brushless motor as described in claim 6, characterized in that, The bracket is provided with multiple limiting posts in the circumferential direction, and the circuit board body is provided with multiple limiting grooves in the circumferential direction, with each limiting post corresponding to a limiting groove. When the circuit board body is supported on the mounting surface, the limiting post is inserted into the limiting groove and aligned with the outer wall of the circuit board body along the circumferential direction of the circuit board body.

9. The hollow cup brushless motor according to any one of claims 1 to 8, characterized in that, The circuit board body is a Hall plate, and the Hall plate 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 body 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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