A circuit board with an open-type threading groove

Abstract

This invention provides a circuit board with an open wire-passing groove, belonging to the field of brushless motor technology. The circuit board is disposed inside the motor to control its operation. The circuit board has a wire-passing groove and an open groove. A first end of the open groove extends along its own direction and communicates with the wire-passing groove, while a second end communicates with the outside, allowing the motor winding harness to move through the open groove to the wire-passing groove and remain inside it, thus ensuring electrical connection between the winding harness and the circuit board. This invention improves the assembly efficiency of the motor winding harness and the circuit board, thereby enhancing the overall motor assembly efficiency.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, and in particular to a circuit board with an open wire channel. Background Technology

[0002] Small-power motors generally use three-phase brushless DC motors as their drive core. Compared with traditional AC motors, three-phase brushless DC motors have advantages such as high efficiency, low noise, long life, and good speed regulation performance, and are therefore widely used in small-power products with high requirements for energy consumption and quiet operation.

[0003] To ensure reliable operation of a brushless motor, a dedicated circuit board (or driver board) needs to be installed inside the motor. This circuit board uses power switching devices to electronically commutate the three-phase windings using Hall effect or non-Hall effect methods, and provides protection functions such as starting, speed regulation, overcurrent, overvoltage, and stall protection. However, in related technical solutions, the mechanical structure design of the circuit board has the following shortcomings:

[0004] Because of the compact structure of low-power motors, the three-phase windings need to pass through the circuit board and be soldered to the corresponding pads. The relevant circuit board only has simple through holes for wires, and the wires are prone to crossing and twisting when passing through. In addition, manual threading is required, and an assembly line often requires two people to meet the requirements, resulting in low assembly efficiency. Utility Model Content

[0005] This utility model provides a circuit board with an open wire channel, the purpose of which is to improve the assembly efficiency of the motor winding harness and the circuit board, thereby improving the assembly efficiency of the motor.

[0006] To achieve the above objectives, this utility model provides a circuit board with an open wire-passing groove. The circuit board is disposed inside a motor to control the operation of the motor. The circuit board has a wire-passing groove and an open groove. A first end of the open groove along its own extension direction is connected to the wire-passing groove, and a second end of the open groove is connected to the outside, so that the winding harness of the motor can move through the open groove to the wire-passing groove and remain in the state of passing through the wire-passing groove, so that the winding harness is electrically connected to the circuit board.

[0007] In one embodiment, the distance between the two opposite walls of the opening groove gradually increases in the direction away from the threading groove.

[0008] In one embodiment, the minimum distance between the two opposite slot walls of the opening slot is greater than or equal to twice the wire diameter of the winding harness.

[0009] In one embodiment, the circuit board has a riveting interface, through which the circuit board is riveted to the fan bracket of the motor or the heat sink of the motor.

[0010] In one embodiment, the circuit board has mounting holes, through which the circuit board is connected to the fan housing of the motor or the end cover of the motor.

[0011] The above-mentioned solution of this utility model has the following beneficial effects:

[0012] In this embodiment, the opening slot communicating with the outside world is connected to the wire threading slot, allowing the motor winding harness to be directly inserted into the wire threading slot from the side of the circuit board through the opening slot. This enables the circuit board of this application to be threaded using an automated robotic arm. On one hand, the robotic arm grips the winding harness and inserts it into the wire threading slot through the opening slot. Compared to manual threading, the robotic arm can complete the simultaneous threading of multiple winding harnesses at once, shortening the threading cycle time and improving the automation level of threading the winding harnesses in the circuit board. This, in turn, improves the assembly efficiency of the motor winding harness and the circuit board, thereby increasing the assembly efficiency of the motor, for example, reducing it from 8-10 seconds / wire to less than 1 second / wire. On the other hand, since manual threading is not required, it can... The same production capacity can be achieved with just one inspector at the threading station, which helps reduce the labor cost of threading. Thirdly, the robotic arm uses the opening slot to insert the winding harness into the threading slot to a uniform depth, and the winding harness can be fixed at the bottom of the threading slot. This results in a high degree of consistency between the circuit board and the winding harness in this application, thereby reducing the possibility of welding errors during the subsequent soldering of the winding harness on the circuit board. For example, the welding error can be reduced from ±1mm to ±0.2mm, effectively reducing the possibility of incomplete soldering and misalignment defects. Fourthly, the opening slot in this application can be milled or stamped from an existing circuit board without adding any additional parts, making the improvement cost of the circuit board in this application lower and the structure simpler.

[0013] Other beneficial effects of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the circuit board structure in one embodiment of the present invention;

[0015] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A in the middle.

[0016] [Explanation of Labels in the Attached Image]

[0017] 1. Circuit board; 11. Wire channel; 12. Opening slot; 13. Riveting interface; 14. Fixing hole. Detailed Implementation

[0018] To make the technical problems, solutions, and advantages of this utility model clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] In related technologies, the method of manually threading the motor winding harness through the circuit board and electrically connecting it to the circuit board is cumbersome and inefficient. Therefore, how to design a circuit board for a three-phase brushless DC motor that is simple in structure, easy to assemble, and reliable in positioning without increasing the overall cost has become a technical problem that urgently needs to be solved by those skilled in the art.

[0022] This application addresses the problems of low wire threading efficiency and the need for manual wire threading of each wire due to "closed wire threading holes" in related technologies. It proposes a solution that improves the closed wire threading slot into an "open slot" structure. This structure enables rapid, snap-fit ​​wire threading of motor winding harnesses on automated equipment without adding extra components or increasing costs, thereby significantly reducing manual labor on the production line, lowering assembly time, and improving consistency.

[0023] Specifically, please refer to Figure 1 and Figure 2Circuit board 1 is installed inside the motor to control its operation. Circuit board 1 has a wire-passing groove 11 and an opening groove 12. Please refer to [link to relevant documentation]. Figure 1 and Figure 2 Both the wire-passing groove 11 and the opening groove 12 penetrate the circuit board 1 along its thickness direction. The first end of the opening groove 12 along its own extension direction is connected to the wire-passing groove 11, and the second end of the opening groove 12 is connected to the outside, so that the motor winding harness can move through the opening groove 12 to the wire-passing groove 11 and remain in the state of being passed through the wire-passing groove 11, so that the winding harness is electrically connected to the circuit board 1.

[0024] For example, at the wire threading station of circuit board 1, a robotic arm can be used to clamp the motor winding harness to the second end of the opening slot 12, at which point the winding harness can be arranged perpendicular to circuit board 1. The robotic arm clamps the winding harness and enters the wire threading slot 11 through the opening slot 12, and can be engaged at the bottom of the wire threading slot 11. The end of the opening slot 12 facing away from the opening slot 12 along its own extension direction is the bottom of the opening slot 12, eliminating the need for manual threading of the winding harness from one side of the circuit board 1 to the other side. Subsequently, an automatic soldering device can solder the winding harness onto circuit board 1 in one go, without any manual intervention throughout the entire process.

[0025] In this embodiment, the opening slot 12, which communicates with the outside world, is connected to the wire threading slot 11, allowing the motor winding harness to be directly inserted into the wire threading slot 11 from the side of the circuit board 1 through the opening slot 12. This enables the circuit board 1 of this application to be threaded using an automated robotic arm. On one hand, the robotic arm grips the winding harness and inserts it into the wire threading slot 11 through the opening slot 12. Compared to manual threading, the robotic arm can complete the simultaneous threading of multiple winding harnesses at once, shortening the threading cycle time and improving the automation level of threading the winding harnesses in the circuit board 1. This, in turn, improves the assembly efficiency of the motor winding harness and the circuit board 1, thereby increasing the assembly efficiency of the motor, for example, reducing it from 8-10 seconds / wire to less than 1 second / wire. On the other hand, since manual threading is not required, it can... The same production capacity can be achieved by equipping one inspector at the threading station, which helps to reduce the labor cost of threading. Thirdly, the robotic arm inserts the winding harness into the threading groove 11 to the same depth through the opening groove 12, and the winding harness can be fixed at the bottom of the threading groove 11. This makes the assembly consistency between the circuit board 1 and the winding harness of this application high, thereby reducing the possibility of welding errors in the subsequent welding of the winding harness on the circuit board 1. For example, the welding error can be reduced from ±1mm to ±0.2mm, effectively reducing the possibility of incomplete soldering and misalignment defects. Fourthly, the opening groove 12 of this application can be milled or stamped from the existing circuit board 1 without adding additional parts, which makes the improvement cost of the circuit board 1 of this application low and the structure relatively simple.

[0026] In one embodiment, please refer to Figure 1 and Figure 2 The distance between the two opposite walls of the opening slot 12 gradually increases in the direction away from the wire-passing slot 11, so that the size of the second end of the opening slot 12 is larger than the size of the first end of the opening slot 12, so that the winding harness can be inserted into the opening slot 12 and then into the wire-passing slot 11 through the opening slot 12. For example, the second end of the opening slot 12 can be configured as a flared shape.

[0027] In one embodiment, the minimum distance between the two opposite slot walls of the opening slot 12 is greater than or equal to twice the wire diameter of the winding harness, so that the winding harness can be inserted into the opening slot 12, and also so that the winding harness can be inserted into the wire slot 11 more smoothly through the opening slot 12.

[0028] In one embodiment, please refer to Figure 1 The circuit board 1 has a riveting interface 13, which is used to rivet the circuit board 1 to the fan bracket or heat sink of the motor to fix the circuit board 1 inside the motor. For example, there can be multiple riveting interfaces 13 to improve the stability of the circuit board 1 inside the motor.

[0029] In one embodiment, please refer to Figure 1 The circuit board 1 has a fixing hole 14, which is used to connect the circuit board 1 to the fan housing of the motor or the end cover of the motor, so as to facilitate the quick positioning of the circuit board 1.

[0030] The above are preferred embodiments of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A circuit board with an open wire-passing groove, characterized in that, The circuit board is disposed inside the motor to control the operation of the motor. The circuit board has a wire-passing groove and an opening groove. The first end of the opening groove along its own extension direction is connected to the wire-passing groove, and the second end of the opening groove is connected to the outside, so that the winding harness of the motor can move through the opening groove to the wire-passing groove and remain in the state of passing through the wire-passing groove, so that the winding harness is electrically connected to the circuit board.

2. The circuit board with an open wire channel according to claim 1, characterized in that, The distance between the two opposite walls of the opening groove gradually increases in the direction away from the threading groove.

3. The circuit board with an open wire-passing groove according to claim 1, characterized in that, The minimum distance between the two opposite slot walls of the opening slot is greater than or equal to twice the wire diameter of the winding harness.

4. The circuit board with an open wire channel according to claim 1, characterized in that, The circuit board has a riveting interface, through which the circuit board is riveted to the fan bracket of the motor or the heat sink of the motor.

5. The circuit board with an open wire channel according to claim 1, characterized in that, The circuit board has mounting holes, through which it is connected to the fan housing of the motor or the end cover of the motor.

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