Circuit board fixing structure of brushless motor

Abstract

A circuit board fixing structure of a brushless motor comprises conductive insertion pieces of a stator and insertion holes formed in a control circuit board, the conductive insertion pieces are inserted into the corresponding insertion holes and are fixed together with the corresponding insertion holes through welding, connecting protruding columns are arranged at the end of the stator at intervals, and the connecting protruding columns are connected with the control circuit board. The control circuit board is provided with board body through holes capable of being connected with the connecting protruding columns in an inserted mode, and when the conductive inserting pieces and the corresponding inserting holes are fixed, the connecting protruding columns and the corresponding board body through holes are connected together. The utility model has the advantages that: on the basis of the connection of the conductive insertion sheet and the insertion hole, an insertion structure of the connecting convex column and the plate body through hole is added, so that the connecting convex column corresponds to and is inserted into the plate body through hole on the control circuit board, and the installation stability of the control circuit board is improved; and the connecting convex columns are arranged at intervals and can abut against the control circuit board in a multi-point manner, so that the mounting stability of the control circuit board is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor manufacturing, in particular to a circuit board fixing structure of a brushless motor. Background Art

[0002] There is a Chinese utility model patent with application number CN201120546009.4 and titled "A brushless motor circuit board mounting structure and a brushless motor" which discloses a brushless motor circuit board mounting structure and a brushless motor. The brushless motor circuit board mounting structure includes an insulating base, a circuit board, a plurality of winding pins, and an electromagnetic interference-resistant pin. The circuit board is spaced apart from one end face of the insulating base; one end of the plurality of winding pins is fixedly connected to the insulating base, and the other end is inserted into and fixed to the circuit board. The winding pins electrically connect the windings connected thereto with the circuit board; one end of the electromagnetic interference-resistant pin is fixedly connected to the insulating base, and the other end is inserted into and fixed to the circuit board. The electromagnetic interference-resistant pins electrically connect the stator with the circuit board. The brushless motor circuit board mounting structure improves the problem of high manufacturing cost and long assembly time when the circuit board is fixed on the stator. However, the fixing of the circuit board in the mounting structure is not stable, and there is still room for improvement, so the mounting structure needs to be further improved. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a circuit board fixing structure for a brushless motor with a control circuit board that is stably and firmly connected to the control circuit board in view of the above-mentioned existing technical status.

[0004] The technical solution adopted by the utility model to solve the above technical problems is as follows: the circuit board fixing structure of the brushless motor comprises a conductive plug of the stator and a socket arranged on the control circuit board, wherein the conductive plug is plugged into the corresponding socket and fixed with the corresponding socket by welding, and is characterized in that: connecting bosses are arranged at intervals at the end of the stator, and a plate body through hole capable of plugging the connecting bosses is arranged on the control circuit board, and when the conductive plug is fixed with the corresponding socket, the connecting boss is connected with the corresponding plate body through hole.

[0005] As an improvement, the connecting bosses may preferably correspond to the conductive plugs one by one, and each connecting boss is located on one side of the corresponding conductive plug.

[0006] As a further improvement, the end of the connecting boss may preferably be provided with a step body, and when the conductive plug is fixed to the corresponding plug hole, the step body is inserted into the corresponding plate body through hole.

[0007] As a further improvement, the height of the step body may preferably be greater than the thickness of the control circuit board, the end of the step body is fixed to the cover plate, the control circuit board is clamped between the connecting boss and the cover plate, and a ventilation gap is left between the end face of the control circuit board and the cover plate.

[0008] As a further improvement, any step body may preferably be a hollow structure, and the step body is connected to the cover plate by screws.

[0009] As a further improvement, a cover plate vent may preferably be provided in the middle of the cover plate.

[0010] As an improvement, the stator can be preferably connected to the shell, the rotor passes through the stator and is connected to the shell, the end of the rotor is connected to the fan, the shell is connected to the wind cover, and the fan is located in the wind cavity formed by the connection of the wind cover and the shell.

[0011] As a further improvement, an annular limiting convex edge may preferably be provided on the end face of the shell surrounded by the air inlet, a connecting convex portion is provided in the groove surrounded by the limiting convex edge, the rotating shaft of the rotor passes through the connecting convex portion, the fan body of the fan is conical, the fan blades of the fan are distributed on the outer wall of the fan body, the bottom outer edge of the fan body extends into the groove, and a fan body recess extending into the connecting convex portion is provided in the middle of the bottom surface of the fan body.

[0012] Further improvement, ribs may be preferably arranged at intervals on the outer wall of the connecting protrusion, the ribs are triangular, and the inclined surface of the ribs is adapted to the inner wall of the concave portion of the fan body.

[0013] As a further improvement, the rotor may preferably include a rotating shaft, a bearing, a magnet, a spacer ring and a balancing block, and the bearing, the spacer ring, the magnet and the balancing block are sequentially sleeved on the rotating shaft.

[0014] Compared with the prior art, the advantages of the utility model are: on the basis of connecting the conductive plug and the socket, a plug-in structure of the connecting boss and the plate through hole is added, so that the connecting boss corresponds to the plate through hole on the control circuit board and is plugged together, thereby improving the installation stability of the control circuit board; and the connecting bosses are arranged at intervals, so that they can touch the control circuit board at multiple points, further improving the installation stability of the control circuit board; the structure is simple and easy to manufacture, so that the control circuit board is stably and firmly connected to the stator, which helps the brushless motor to work stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A three-dimensional diagram of an embodiment of the utility model;

[0016] Figure 2 for Figure 1 Front projection of

[0017] Figure 3 yes Figure 2 Sectional view along line AA;

[0018] Figure 4 yes Figure 1 The structural breakdown diagram of

[0019] Figure 5 yes Figure 4 Further structural decomposition diagram of ;

[0020] Figure 6 yes Figure 5 A further structural exploded view after removing the cover and control circuit board;

[0021] Figure 7 yes Figure 5 The structural exploded view at another angle after the cover and control circuit board are removed;

[0022] Figure 8 yes Figure 7 Further structural decomposition diagram of ;

[0023] Fig. 9 yes Figure 8 An exploded view of the structure at another angle. DETAILED DESCRIPTION

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 9 As shown, the circuit board fixing structure of the brushless motor of this embodiment includes a conductive plug 31 of the stator 3 and a socket 42 arranged on the control circuit board 4. The conductive plug 31 is inserted into the corresponding socket 42 and fixed to the corresponding socket 42 by welding. The end of the stator 3 is provided with connecting bosses 32 at intervals, and the control circuit board 4 is provided with a board through hole 41 that can be inserted with the connecting boss 32. When the conductive plug 31 is fixed to the corresponding socket 42, the connecting boss 32 is connected to the corresponding board through hole 41.

[0026] The connecting bosses 32 correspond to the conductive plugs 31 one by one, and each connecting boss 32 is located on one side of the corresponding conductive plug 31. A step body 321 is provided at the end of the connecting boss 32. When the conductive plug 31 is fixed to the corresponding plug hole 42, the step body 321 is plugged into the corresponding plate body through hole 41. The height of the step body 321 is greater than the thickness of the control circuit board 4. The end of the step body 321 is fixed to the cover plate 7. The control circuit board 4 is sandwiched between the connecting boss 32 and the cover plate 7. A ventilation gap is left between the end face of the control circuit board 4 and the cover plate 7. Any step body 321 is a hollow structure, and the step body 321 is connected to the cover plate 7 by screws.

[0027] The stator 3 is connected to the shell 1, the rotor 2 passes through the stator 3 and is connected to the shell 1, the end of the rotor 2 is connected to the fan 5, the shell 1 is connected to the wind cover 6, and the fan 5 is located in the wind cavity formed by the connection of the wind cover 6 and the shell 1.

[0028] An annular limiting convex edge 12 is provided on the end surface of the housing 1 surrounded by the air inlet 11, a connecting convex portion 13 is provided in the groove surrounded by the limiting convex edge 12, the rotating shaft 21 of the rotor 2 passes through the connecting convex portion 13, the fan body of the fan 5 is conical, the blades 52 of the fan 5 are distributed on the outer wall of the fan body, the bottom outer edge of the fan body extends into the groove, and a fan body concave portion 51 extending into the connecting convex portion 13 is provided in the middle of the bottom surface of the fan body. Ribs 131 are arranged at intervals on the outer wall of the connecting convex portion 13, the ribs 131 are triangular, and the inclined surface of the ribs 131 is adapted to the inner wall of the fan body concave portion 51.

[0029] The rotor 2 includes a rotating shaft 21, a bearing 22, a magnet 23, a spacer ring 24 and a balancing weight 25, wherein the bearing 22, the spacer ring 24, the magnet 23 and the balancing weight 25 are sequentially sleeved on the rotating shaft 21. The specific structure of the stator belongs to the known technology, so it will not be described in detail. The specific circuit structure adopted by the control circuit board belongs to the existing technology, so it will not be described in detail.

Claims

1. A circuit board fixing structure for a brushless motor, comprising a conductive plug (31) of a stator (3) and a socket (42) arranged on a control circuit board (4), wherein the conductive plug (31) is plugged into a corresponding socket (42) and fixed to the corresponding socket (42) by welding, characterized in that: The end of the stator (3) is provided with connection bosses (32) at intervals, and the control circuit board (4) is provided with a plate body through hole (41) capable of plugging the connection bosses (32). When the conductive plug (31) is fixed to the corresponding plug hole (42), the connection boss (32) and the corresponding plate body through hole (41) are connected together.

2. The circuit board fixing structure according to claim 1, characterized in that: The connecting convex columns (32) correspond to the conductive plug sheets (31) one by one, and each connecting convex column (32) is located on one side of the corresponding conductive plug sheet (31).

3. The circuit board fixing structure according to claim 2, characterized in that: The end of the connecting protrusion (32) is provided with a step body (321), and when the conductive plug (31) is fixed to the corresponding plug hole (42), the step body (321) is inserted into the corresponding plate body through hole (41).

4. The circuit board fixing structure according to claim 3, characterized in that: The height of the step body (321) is greater than the thickness of the control circuit board (4); the end of the step body (321) is fixed to the cover plate (7); the control circuit board (4) is clamped between the connecting boss (32) and the cover plate (7); and a ventilation gap is left between the end surface of the control circuit board (4) and the cover plate (7).

5. The circuit board fixing structure according to claim 4, characterized in that: Any step body (321) is a hollow structure, and the step body (321) is connected to the cover plate (7) via screws.

6. The circuit board fixing structure according to claim 5, characterized in that: A cover plate vent (71) is provided in the middle of the cover plate (7).

7. The circuit board fixing structure according to any one of claims 1 to 6, characterized in that: The stator (3) is connected to the housing (1), the rotor (2) passes through the stator (3) and is connected to the housing (1), the end of the rotor (2) is connected to the fan (5), the housing (1) is connected to the wind cover (6), and the fan (5) is located in an air cavity formed by the connection of the wind cover (6) and the housing (1).

8. The circuit board fixing structure according to claim 7, characterized in that: An annular limiting convex edge (12) is arranged on the end surface of the shell (1) surrounded by the air inlet (11), a connecting convex portion (13) is arranged in the groove surrounded by the limiting convex edge (12), the rotating shaft (21) of the rotor (2) passes through the connecting convex portion (13), the fan body (5) is conical, the fan blades (52) of the fan (5) are distributed on the outer wall of the fan body, the bottom outer edge of the fan body extends into the groove, and a fan body concave portion (51) extending into the connecting convex portion (13) is arranged in the middle of the bottom surface of the fan body.

9. The circuit board fixing structure according to claim 8, characterized in that: Ribs (131) are arranged at intervals on the outer wall of the connecting protrusion (13), the ribs (131) are triangular in shape, and the inclined surface of the ribs (131) is adapted to the inner wall of the sector recess (51).

10. The circuit board fixing structure according to claim 7, characterized in that: The rotor (2) comprises a rotating shaft (21), a bearing (22), a magnet (23), a spacer ring (24) and a balancing block (25); the bearing (22), the spacer ring (24), the magnet (23) and the balancing block (25) are sleeved on the rotating shaft (21) in sequence.

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