Hidden heat dissipation structure of high-speed brushless motor

Abstract

The utility model belongs to the technical field of motors, and particularly relates to a hidden heat dissipation structure of a high-speed brushless motor, which comprises an outer rotor shell and a stator winding, a main shaft is fixedly connected to the center of the inner bottom of the outer rotor shell, and a plurality of air inlets are formed in the side surface of the outer rotor shell; a through hole is formed in the center of the bottom of the outer rotor shell, a blind hole is formed in the tail of the main shaft, and the through hole and the blind hole are communicated to form an exhaust cavity. The stator winding is rotatably connected with the main shaft through fixed installation of the stator winding and the stator core support, a transfer cavity is formed in the inner side of the stator core support, air exhaust holes used for air exhaust are formed in the transfer cavity and the air exhaust cavity section of the main shaft, and external air is exhausted out of the motor after sequentially passing through the air inlet, the transfer cavity and the air exhaust cavity. Heat generated by a stator winding can be discharged out of the outer side of the motor in a heat convection mode, and interference to a motor driving plate and a driven part fixed to a main shaft is avoided through the design of tail air exhaust.

Description

Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to a hidden heat dissipation structure for a high-speed brushless motor. Background Technology

[0002] An external rotor brushless motor is a brushless motor in which the rotation of the external rotor housing drives the main shaft to rotate. Brushless motors generally have high speeds, and their heat dissipation is not good at full load power. They generally rely on the usage scenario for heat dissipation. For example, brushless motors can be cooled when drones are in flight. However, for usage scenarios that are not conducive to the heat dissipation of brushless motors, external devices or heat dissipation structures are generally required to prevent the brushless motor from overheating. However, brushless motors generally do not have a good heat dissipation structure. Utility Model Content

[0003] To address the problems mentioned in the background section, this invention provides a concealed heat dissipation structure for a high-speed brushless motor. This structure offers excellent heat dissipation and, through its tail exhaust design, avoids interference with the motor drive board and the driven components fixed to the spindle.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a hidden heat dissipation structure for a high-speed brushless motor, comprising an outer rotor housing and a stator winding, a main shaft fixedly connected to the center of the inner bottom of the outer rotor housing, several air inlets opened on the side of the outer rotor housing, a through hole opened at the center of the bottom of the outer rotor housing, and a blind hole opened at the tail of the main shaft, the through hole and the blind hole communicating to form an exhaust cavity;

[0005] The stator winding is rotatably connected to the main shaft through a fixed installation with the stator core support. A transfer cavity is provided on the inner side of the stator core support. Both the transfer cavity and the exhaust cavity section of the main shaft are provided with exhaust holes for ventilation.

[0006] As a preferred embodiment of the concealed heat dissipation structure for a high-speed brushless motor of this utility model, a number of outer rotor magnets are fixedly connected to the inner wall of the outer rotor housing, and the air inlet is located between two adjacent outer rotor magnets.

[0007] As a preferred embodiment of the concealed heat dissipation structure for a high-speed brushless motor according to this utility model, a fixing rod is fixedly connected to the inner side of the air inlet, and a flexible sealing sheet is rotatably connected to the outer side of the fixing rod. The flexible sealing sheet seals the air inlet through its own elasticity.

[0008] As a preferred embodiment of the concealed heat dissipation structure for a high-speed brushless motor according to this utility model, counterweight strips are fixedly connected to the inner sides of both ends of the flexible sealing sheet.

[0009] As a preferred embodiment of the concealed heat dissipation structure for a high-speed brushless motor of this utility model, a number of linearly arranged air guide grooves are provided on the outer end face of the outer rotor housing, and the air guide grooves are connected to the air inlet.

[0010] As a preferred embodiment of the concealed heat dissipation structure for a high-speed brushless motor of this utility model, a bearing A is fixedly connected to the outer side of one end of the spindle, a motor mounting bracket is fixedly connected to the outer surface of the bearing A, and the motor mounting bracket is fixedly connected to the motor drive board.

[0011] As a preferred embodiment of the concealed heat dissipation structure for a high-speed brushless motor according to this utility model, a bearing B is fixedly connected to the inner side of one end of the stator core bracket, and the inner surface of the bearing B is fixedly connected to the outer side of one end of the main shaft.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This solution opens an air inlet on the outer rotor housing and, through the intermediate cavity provided by the stator core support, forces external air to enter the motor's internal space from the air inlet when the outer rotor housing rotates. Then, in conjunction with the exhaust hole, the external air passes through the air inlet, intermediate cavity, and exhaust cavity in sequence before being discharged from the motor. This allows the heat generated by the stator windings to be discharged to the outside of the motor through thermal convection. The tail exhaust design avoids interference with the motor drive board and the driven components fixed to the main shaft. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a front view of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the rear of the overall structure of this utility model;

[0016] Figure 3 This is a partial cross-sectional view of the outer rotor housing in this utility model;

[0017] Figure 4 In this utility model Figure 3 A magnified structural diagram at point A;

[0018] Figure 5 This is a partial sectional view of the stator core support in this utility model;

[0019] Figure 6 This is a front sectional view of the installation structure of the flexible sealing sheet in this utility model;

[0020] Figure 7This is a schematic diagram of the connection structure between the stator winding and the motor drive board in this utility model;

[0021] Figure 8 This is a schematic diagram showing the positional relationship between the outer rotor magnet and the air inlet in this utility model;

[0022] In the picture:

[0023] 1. Outer rotor housing; 2. Main shaft; 3. Air inlet; 4. Exhaust chamber; 5. Stator winding; 6. Stator core support; 7. Transfer chamber; 8. Exhaust vent;

[0024] 9. External rotor magnet;

[0025] 10. Fixing rod; 11. Flexible sealing sheet;

[0026] 12. Counterweight bar;

[0027] 13. Air guide duct;

[0028] 14. Bearing A; 15. Motor mounting bracket; 16. Motor drive board;

[0029] 17. Bearing B. Detailed Implementation

[0030] 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 protection scope of the present utility model.

[0031] like Figures 1-8 As shown:

[0032] A concealed heat dissipation structure for a high-speed brushless motor includes an outer rotor housing 1 and a stator winding 5. A main shaft 2 is fixedly connected to the center of the inner bottom of the outer rotor housing 1. Several air inlets 3 are opened on the side of the outer rotor housing 1. A through hole is opened at the center of the bottom of the outer rotor housing 1. A blind hole is opened at the tail of the main shaft 2. The through hole and the blind hole communicate to form an exhaust cavity 4.

[0033] The stator winding 5 is rotatably connected to the main shaft 2 through the fixed installation of the stator core support 6. The inner side of the stator core support 6 is provided with a transfer cavity 7. Both the transfer cavity 7 and the exhaust cavity 4 of the main shaft 2 are provided with exhaust holes 8 for exhaust.

[0034] In this solution, the external rotor brushless motor is a brushless motor that drives the main shaft 2 to rotate by rotating the external rotor housing 1. Brushless motors generally have high speeds and poor heat dissipation at full load power. They generally rely on the usage scenario for heat dissipation. For example, brushless motors can be cooled when drones are flying. However, for usage scenarios that are not conducive to the heat dissipation of brushless motors, external devices or heat dissipation structures are generally required to prevent the brushless motor from overheating. However, brushless motors themselves generally do not have good heat dissipation structures.

[0035] This solution involves opening an air inlet 3 on the outer rotor housing 1 and using the intermediate cavity 7 of the stator core support 6. When the outer rotor housing 1 rotates, external air is forced to enter the motor's internal space through the air inlet 3. In conjunction with the exhaust hole 8, the external air passes through the air inlet 3, the intermediate cavity 7, and the exhaust cavity 4 in sequence before being discharged from the motor. This allows the heat generated by the stator winding 5 to be discharged to the outside of the motor through thermal convection. The tail exhaust design avoids interference with the motor drive board 16 and the driven components fixed to the main shaft 2.

[0036] In an optional embodiment, a plurality of outer rotor magnets 9 are fixedly connected to the inner wall surface of the outer rotor housing 1, and the air inlet 3 is disposed between two adjacent outer rotor magnets 9.

[0037] In this embodiment, in order for external air to pass smoothly through the air inlet 3, the air inlet 3 is set between two adjacent external rotor magnets 9.

[0038] In an optional embodiment, a fixing rod 10 is fixedly connected to the inner side of the air inlet 3, and a flexible sealing sheet 11 is rotatably connected to the outer side of the fixing rod 10. The flexible sealing sheet 11 seals the air inlet 3 through its own elasticity.

[0039] In this embodiment, when not in use, to prevent external dirt from entering the brushless motor, the flexible sealing sheet 11 seals the air inlet 3 with its elasticity. Simultaneously, to increase the air intake effect during use, the flexible sealing sheet 11 is provided, and it can be opened during use, such as... Figure 6As shown, when the outer rotor housing 1 rotates clockwise, the centrifugal force causes the two ends of the flexible sealing sheet 11 to be thrown outward, creating a certain gap between the end of the flexible sealing sheet 11 and the outer rotor housing 1. Under the action of wind resistance, the wind can blow the gap larger, thus enabling the air inlet 3 to be open for a long time. The right side of the flexible sealing sheet 11 tilts upward, and due to the elasticity of the flexible sealing sheet 11 itself and the limitation of the rotation position, the left side of the flexible sealing sheet 11 will be pressed downward, thus forming an inclined air inlet gap that is conducive to the entry of external air in this rotation direction. The principle is the same when the outer rotor housing 1 rotates counterclockwise. Therefore, the design of this structure has a good heat dissipation and air guiding effect when the brushless motor rotates in both forward and reverse directions.

[0040] In an optional embodiment, counterweight strips 12 are fixedly connected to the inner sides of both ends of the flexible sealing sheet 11.

[0041] In this embodiment, in order to make it easier for the two ends of the flexible sealing sheet 11 to lift up under the action of centrifugal force, counterweight strips 12 are provided at both ends of the flexible sealing sheet 11.

[0042] In an optional embodiment, a plurality of linearly arranged air guide grooves 13 are provided on the outer end face of the outer rotor housing 1, and the air guide grooves 13 are connected to the air inlet 3.

[0043] In this embodiment, in order to enable the wind to blow a larger gap under the action of wind resistance, thereby enabling the air inlet 3 to be opened for a long time, an air guide groove 13 is added, which can help the wind blow up one end of the flexible sealing sheet 11 while the other end remains unaffected.

[0044] In an optional embodiment, a bearing A14 is fixedly connected to the outer side of one end of the spindle 2, and a motor mounting bracket 15 is fixedly connected to the outer surface of the bearing A14. The motor mounting bracket 15 is fixedly connected to the motor drive board 16.

[0045] In this embodiment, the motor mounting bracket 15 is fixedly connected to the motor drive board 16, thereby ensuring that the motor drive board 16 is fixed and does not rotate. The bearing A14 is fixedly installed with the motor mounting bracket 15, which can prevent damage to the motor drive board 16 caused by force.

[0046] In an optional embodiment, a bearing B17 is fixedly connected to the inner side of one end of the stator core support 6, and the inner surface of the bearing B17 is fixedly connected to the outer side of one end of the main shaft 2.

[0047] In this embodiment: In order to reduce the instability caused by the vibration of the stator core support 6 due to the flow of air in the transfer cavity 7, a bearing B17 is added to rotatably connect the stator core support 6 and the main shaft 2. After the air enters the interior of the outer rotor housing 1, it can enter the transfer cavity 7 through the exhaust hole 8 opened on the stator core support 6. The air in the transfer cavity 7 can enter the inner side of the exhaust cavity 4 through the exhaust hole 8 opened on the exhaust cavity 4 section of the main shaft 2, and then be discharged to the outside of the brushless motor.

[0048] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A hidden heat dissipation structure of a high-speed brushless motor, comprising an outer rotor shell (1) and a stator winding (5), a main shaft (2) is fixedly connected at the inner bottom central position of the outer rotor shell (1), characterized in that: A plurality of air inlets (3) are arranged on the side surface of the outer rotor shell (1), a through hole is arranged at the central position of the bottom of the outer rotor shell (1), a blind hole is arranged at the tail of the main shaft (2), the through hole and the blind hole are communicated to form an air exhaust cavity (4); The stator winding (5) is rotatably connected with the main shaft (2) through the fixed installation of the stator core support (6), the inner side of the stator core support (6) is provided with a transfer cavity (7), the transfer cavity (7) and the air exhaust cavity (4) section of the main shaft (2) are both provided with air exhaust holes (8) for air exhaust.

2. The hidden heat dissipation structure of a high-speed brushless motor according to claim 1, characterized in that: A plurality of outer rotor magnetic steels (9) are fixedly connected to the inner wall surface of the outer rotor shell (1), and the air inlets (3) are arranged between two adjacent outer rotor magnetic steels (9).

3. The hidden heat dissipation structure of high-speed brushless motor according to claim 1, characterized in that: The inner side of the air inlet (3) is fixedly connected with a fixed rod (10), the outer side of the fixed rod (10) is rotatably connected with a flexible sealing sheet (11), and the flexible sealing sheet (11) blocks the air inlet (3) through its elasticity.

4. The hidden heat dissipation structure of high-speed brushless motor according to claim 3, characterized in that: The inner side of both ends of the flexible sealing sheet (11) is fixedly connected with a counterweight strip (12).

5. The hidden heat dissipation structure of high-speed brushless motor according to claim 3 or 4, characterized in that: A plurality of linearly arranged air guide grooves (13) are arranged on the outer end surface of the outer rotor shell (1), and the air guide grooves (13) are communicated with the air inlets (3).

6. The hidden heat dissipation structure of high-speed brushless motor according to claim 1, characterized in that: The outer side of one end of the main shaft (2) is fixedly connected with a bearing A (14), the outer surface of the bearing A (14) is fixedly connected with a motor mounting rack (15), and the motor mounting rack (15) is fixedly connected with a motor driving plate (16).

7. The hidden heat dissipation structure of high-speed brushless motor according to claim 1, characterized in that: The inner side of one end of the stator core support (6) is fixedly connected with a bearing B (17), and the inner surface of the bearing B (17) is fixedly connected with the outer side of one end of the main shaft (2).

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