Brushless motor

Abstract

A brushless motor comprises a shell, a rotor, a stator capable of being connected with a control circuit board, a fan and a fan cover, an annular limiting protruding edge is arranged on the end face, defined by an air inlet, of the shell, a connecting protruding part is arranged in a groove defined by the limiting protruding edge, a rotating shaft of the rotor penetrates through the connecting protruding part, the outer edge of the bottom of the fan extends into the groove, and the outer edge of the bottom of the fan extends into the groove. And a fan body concave part extending into the connecting convex part is arranged on the bottom surface of the fan. The fan body is conical, the fan blades are distributed on the outer wall of the fan body, the outer edge of the bottom of the fan body extends into the groove, and the fan body concave part is arranged in the middle of the bottom face of the fan body. The brushless motor has the advantages that the limiting convex edge is matched with the bottom of the fan, and the connecting convex part is matched with the concave part of the fan body of the fan, so that a zigzag gap is formed, the sealing performance of the end surface of the shell on the inner side of the air inlet is improved, the waterproof and dustproof effects are good, and the service life of the brushless motor is prolonged. The fan body can be of a conical structure, and the sealing effect is further improved.

Description

Technical Field

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

[0002] There is a Chinese utility model patent with application number CN201120546009.4 and titled "New Brushless Motor Winding Stator for Electric Vehicles", which discloses a new brushless motor winding stator for electric vehicles, including a motor housing, a motor cover fixedly installed on the top of the motor housing, the motor cover is a circular disc structure, and the outer side of the motor cover coincides with the inner upper end wall of the motor housing, and the top wall of the motor cover is provided with four air inlet and heat dissipation ports, the air inlet and heat dissipation ports are arc-shaped holes, and the air inlet and heat dissipation ports penetrate the entire motor cover, and a rotating bearing is fixedly installed at the center position of the motor cover, and the outer side of the rotating bearing coincides with the inner wall of the motor cover. In the invention, the new brushless motor winding stator for electric vehicles, the guide cone will suck air from the outside through the air inlet and heat dissipation port due to the presence of the inclined slot during the rotation process, and the air will enter the stator after being sucked in, and then be discharged from the air outlet and heat dissipation port, and the circulation of air will take away the heat, achieving the effect of ventilation and heat dissipation. However, the conical structure in the brushless motor is a dust cover, and the dust-proof effect of the dust cover connecting structure and the internal structure of the dust cover still needs to be improved, so the structure of the brushless motor needs to be further improved. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a brushless motor with good waterproof sealing effect of the rotating shaft 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: the brushless motor includes a shell, a rotor, a stator that can be connected to a control circuit board, a fan, and a wind cover, and is characterized in that: an annular limiting convex edge is arranged on the end face of the shell surrounded by the air inlet, a connecting convex portion is arranged in the groove surrounded by the limiting convex edge, the rotating shaft of the rotor passes through the connecting convex portion, the bottom outer edge of the fan extends into the groove, and a fan body recess extending into the connecting convex portion is arranged on the bottom surface of the fan.

[0005] As an improvement, the fan may preferably include a fan body and fan blades, the fan body is conical, the fan blades are distributed on the outer wall of the fan body, the bottom outer edge of the fan body extends into the groove, and the fan body recess is arranged in the middle of the bottom surface of the fan body.

[0006] As a further improvement, ribs may be preferably arranged at intervals on the outer wall of the connecting protrusion, the ribs are triangular in shape, and the inclined surfaces of the ribs are matched with the inner walls of the recessed part of the fan body.

[0007] As a further improvement, a limiting convex ring which can reduce the friction between the inner end surface and the rotor surface can be preferably provided on the inner end surface of the recessed portion of the sector body.

[0008] As an improvement, the cover body of the wind cover may preferably be a closed conical cover adapted to the fan.

[0009] As an improvement, the rotor may preferably include a rotating shaft, a bearing, a magnet, a spacer ring and a balancing weight, and the bearing, the spacer ring, the magnet and the balancing weight are sequentially sleeved on the rotating shaft.

[0010] As a further improvement, the spacer ring may preferably be an aluminum sleeve with good heat dissipation effect.

[0011] As an improvement, the stator may preferably be detachably connected to the housing.

[0012] As a further improvement, a connecting boss may be preferably provided on one side of each conductive plug of the stator, and a plate through hole capable of plugging into the connecting boss is provided at a corresponding position of the control circuit board.

[0013] As a further improvement, the connection end of any connecting boss may preferably be provided with a step body, and the step body is inserted into the corresponding through hole of the plate body.

[0014] Compared with the prior art, the advantages of the utility model are: by cooperating with the limiting convex edge and the bottom of the fan, and at the same time cooperating with the connecting convex part and the concave part of the fan body, a tortuous gap is formed, thereby improving the sealing performance of the shell end face inside the air inlet, and having good waterproof and dustproof effects, thereby extending the service life of the brushless motor; the fan body can adopt a conical structure to further improve the sealing effect. 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 An exploded view of the structure at another angle;

[0021] Figure 7 yes Figure 5 Further structural decomposition diagram of ;

[0022] Figure 8 yes Figure 1 A three-dimensional diagram after connecting the control circuit board;

[0023] Fig. 9 yes Figure 8 Structural breakdown diagram. 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 brushless motor of this embodiment includes a shell 1, a rotor 2, a stator 3 that can be connected to a control circuit board 4, a fan 5, and a wind cover 6. An annular limiting ridge 12 is arranged on the end face of the shell 1 surrounded by an air inlet 11, and a connecting ridge 13 is arranged in the groove surrounded by the limiting ridge 12. The rotating shaft 21 of the rotor 2 passes through the connecting ridge 13, and the bottom outer edge of the fan 5 extends into the groove. A fan body recess 51 extending into the connecting ridge 13 is arranged on the bottom surface of the fan 5.

[0026] The fan 5 includes a fan body and fan blades 52. The fan body is conical. The fan blades 52 are distributed on the outer wall of the fan body. The outer edge of the bottom of the fan body extends into the groove. The fan body recess 51 is set in the middle of the bottom surface of the fan body. Ribs 131 are arranged at intervals on the outer wall of the connecting protrusion 13. The ribs 131 are triangular in shape. The inclined surface of the ribs 131 is matched with the inner wall of the fan body recess 51. A limiting convex ring 511 is arranged on the inner end surface of the fan body recess 51 to reduce the friction between the inner end surface and the rotor surface. The cover body of the wind cover 6 is a closed conical cover that is matched with the fan 5.

[0027] The rotor 2 comprises 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 sleeved on the rotating shaft 21 in sequence. The spacer ring 24 is an aluminum sleeve with good heat dissipation effect.

[0028] The stator 3 can be detachably connected to the housing 1. The specific structure of the stator belongs to the known technology, so it will not be described in detail. A connecting boss 32 is provided on one side of each conductive plug 31 of the stator 3, and a plate through hole 41 that can be plugged into the connecting boss 32 is provided at the corresponding position of the control circuit board 4. The specific circuit structure adopted by the control circuit board 4 belongs to the existing technology, so it will not be described in detail. A socket 42 is provided on the control circuit board 4, and the conductive plug 31 is inserted into the corresponding socket 42 and connected together by welding to achieve electrical conduction. A step body 321 is provided at the connection end of any connecting boss 32, and the step body 321 is plugged into the corresponding plate through hole 41.

Claims

1. A brushless motor, comprising a housing (1), a rotor (2), a stator (3) connectable to a control circuit board (4), a fan (5), and a fan cover (6), 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 bottom outer edge of the fan (5) extends into the groove, and a fan body concave portion (51) extending into the connecting convex portion (13) is arranged on the bottom surface of the fan (5).

2. The brushless motor according to claim 1, characterized in that: The fan (5) comprises a fan body and fan blades (52); the fan body is conical; the fan blades (52) are distributed on the outer wall of the fan body; the outer edge of the bottom of the fan body extends into the groove; and the fan body recess (51) is arranged in the middle of the bottom surface of the fan body.

3. The brushless motor according to claim 2, 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).

4. The brushless motor according to claim 3, characterized in that: A limiting convex ring (511) is arranged on the inner end surface of the sector body recess (51) to reduce friction between the inner end surface and the rotor surface.

5. The brushless motor according to any one of claims 2 to 4, characterized in that: The cover body of the wind cover (6) is a closed conical cover that is compatible with the fan (5).

6. The brushless motor according to any one of claims 1 to 4, 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.

7. The brushless motor according to claim 6, characterized in that: The spacer ring (24) is an aluminum sleeve with good heat dissipation effect.

8. The brushless motor according to any one of claims 1 to 4, characterized in that: The stator (3) is detachably connected to the housing (1).

9. The brushless motor according to claim 8, characterized in that: A connecting boss (32) is provided on one side of each conductive plug (31) of the stator (3), and a plate body through hole (41) capable of plugging the connecting boss (32) is provided at a corresponding position of the control circuit board (4).

10. The brushless motor according to claim 9, characterized in that: A step body (321) is provided at the connection end of any connection boss (32), and the step body (321) is inserted into a corresponding plate body through hole (41).

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