Motor heat dissipation structure, brushless motor and unmanned aerial vehicle
By designing heat dissipation fins on the side plates and ring walls of the brushless motor, heat dissipation efficiency is improved, the problem of motor overheating and damage is solved, and the motor achieves high-efficiency operation.
Patent Information
- Application Number
- CN202520175953.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-27
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-27
AI Technical Summary
Existing brushless motors have low heat dissipation efficiency, which makes them prone to overheating and damage when running at high power for extended periods.
Design a motor heat dissipation structure, including a side plate and an annular wall. The inner side of the side plate is provided with heat dissipation fins. Cold air is drawn in from the air inlet of the motor base, and after heat exchange by the heat dissipation fins, it is discharged from the air outlet of the annular wall. The heat dissipation fins are distributed in a circumferential array and gradually increase in width to enhance the strength of the connection. The air outlet is also distributed in a circumferential array.
It improves heat dissipation efficiency by 8-10%, reduces the probability of motor damage due to overheating, ensures continuous and efficient operation of the motor, and enhances the working condition of the brushless motor.
Smart Images
Figure CN223829158U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of brushless motors, in particular to a motor heat dissipation structure, a brushless motor and a drone. BACKGROUND
[0002] The motor body in the existing brushless motor mainly includes a stator and a rotor. The brushless motor needs to be effectively cooled during operation to ensure that the brushless motor is in a good working state. The heat dissipation efficiency of the motor heat dissipation structure in the prior art is low. In the case of high power and long time operation, the motor is easily damaged due to overheating. CONTENT OF THE INVENTION
[0003] The purpose of the embodiments of the present application is to provide a motor heat dissipation structure, a brushless motor and a drone to improve the heat dissipation efficiency of the motor heat dissipation structure. The specific technical solutions are as follows:
[0004] The first aspect of the present application provides a motor heat dissipation structure fixedly connected with an outer rotor of a motor, comprising a side plate and a ring wall arranged at the outer edge of the side plate, wherein the ring wall is provided with a plurality of air outlets; the inner side of the side plate is provided with a plurality of heat dissipation fins, the plurality of heat dissipation fins extend outward along the center of the side plate and are distributed in a circumferential array; the two sides of the heat dissipation fin along the circumferential direction are arc-shaped; when the motor operates, cold air is sucked into the motor from the air inlet on the side of the motor base, the cold air is heat exchanged in the motor, the heat dissipation fin flings the heat exchanged air outward, and the heat exchanged air is discharged from the air outlet of the ring wall.
[0005] In some embodiments, the width of the heat dissipation fin gradually increases along the direction in which the heat dissipation fin extends outward.
[0006] In some embodiments, one end of the heat dissipation fin close to the ring wall is provided with a reinforcing step, and the reinforcing step is used to strengthen the strength of the connection between the heat dissipation fin and the ring wall.
[0007] In some embodiments, the side of the ring wall facing the motor base is provided with a plurality of partition columns, and the positions of the adjacent partition columns form mounting grooves, the magnets of the motor correspond one-to-one with the positions of the mounting grooves, and the magnets of the motor are at least partially located in the mounting grooves.
[0008] In some embodiments, the air outlets are arrayed along the circumferential direction of the ring wall.
[0009] In some embodiments, a reinforcing connecting plate is arranged at the center of the inner side of the side plate.
[0010] The heat dissipation fin extends outward from the reinforcing connecting plate, and the rotating shaft of the motor passes through the center of the reinforcing connecting plate.
[0011] In some embodiments, the reinforcing connecting plate is provided with a plurality of weight-reducing grooves, which are distributed in a circumferential array.
[0012] In some embodiments, the reinforcing connecting plate is provided with connecting holes that can connect to external drone propellers.
[0013] An embodiment of the second aspect of this application provides a brushless motor, including the motor heat dissipation structure described above.
[0014] An embodiment of the third aspect of this application provides a drone including the brushless motor described above.
[0015] In this embodiment, the motor cooling structure is connected to the outer rotor. During motor operation, the cooling structure and the outer rotor rotate together. Cool air is drawn in through the air inlet on the side of the motor base and undergoes heat exchange inside the motor. During the rotation of the motor cooling structure, the arc-shaped cooling fins on both sides along the circumferential direction accelerate the outward ejection of the heat-exchanged air and its discharge from the air outlet of the motor cooling structure. This design effectively dissipates heat from the running motor. Compared to existing motor cooling structures, the heat dissipation efficiency can be improved by 8% to 10%, effectively reducing the probability of motor damage due to excessive internal heat. This allows the motor to maintain a continuously high-efficiency working state, improving overall work efficiency.
[0016] Of course, any product implementing this application does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings.
[0018] Figure 1 This is a schematic diagram of the motor heat dissipation structure in an embodiment of this application;
[0019] Figure 2 This is an exploded view of the brushless motor in the embodiments of this application;
[0020] Figure 3 This is an isometric view of the brushless motor in an embodiment of this application;
[0021] Figure 4 for Figure 3 A cross-sectional view of the brushless motor shown.
[0022] Figure 5 forFigure 3 The image shows a side view of the brushless motor.
[0023] Figure label:
[0024] Motor heat dissipation structure 10; side plate 111; ring wall 112; air outlet 1121; heat dissipation fins 113; reinforcing step 1131; first side 1132; second side 1133; partition column 114; mounting groove 115; reinforcing connecting plate 116; weight reduction groove 1161; connecting hole 1162;
[0025] Motor base 21; air inlet 211; magnet 22; shaft 23; stator 24; bearing 25; steel ring 26. Detailed Implementation
[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art based on this application are within the scope of protection of this application.
[0027] To improve the heat dissipation efficiency of the motor, such as Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the motor heat dissipation structure in an embodiment of this application; Figure 2 This is an exploded view of a brushless motor in an embodiment of this application. An embodiment of the first aspect of this application provides a motor heat dissipation structure 10, which is connected to the outer rotor of the motor. The motor heat dissipation structure 10 includes: a side plate 111 and an annular wall 112 disposed on the outer edge of the side plate 111. The annular wall 112 has multiple air outlets 1121. Multiple heat dissipation fins 113 are provided on the inner side of the side plate 111, extending outwards along the center of the side plate 111 and arranged in a circumferential array. The two sides of the heat dissipation fins 113 are arc-shaped in the circumferential direction. When the motor is running, cold air is drawn into the motor from the air inlet 211 on the side of the motor base 21. The cold air undergoes heat exchange inside the motor, and the heat dissipation fins 113 throw the heat-exchanged air outwards and discharge it from the air outlets 1121 of the annular wall 112.
[0028] In this embodiment, the motor cooling structure 10 is connected to the outer rotor of the motor. During motor operation, the motor cooling structure 10 and the outer rotor rotate together. Cold air is drawn in from the air inlet 211 on the side of the motor base 21, and heat exchange occurs inside the motor. During the rotation of the motor cooling structure 10, the arc-shaped heat dissipation fins 113 on both sides along the circumferential direction can accelerate the speed at which the heat-exchanged air is thrown outward and discharged from the air outlet 1121 of the motor cooling structure 10. Through the above configuration, the operating motor can be effectively cooled. Compared with the existing motor cooling structure 10, the heat dissipation efficiency can be improved by 8% to 10%, which can effectively reduce the probability of motor damage caused by excessive internal heat, thereby enabling the motor to continuously operate in a high-efficiency state and improving work efficiency.
[0029] like Figure 1 , Figure 2 As shown, during the operation of the motor, the outer rotor drives the motor heat dissipation structure 10 to rotate. Along the center of the motor heat dissipation structure towards the edge, the air speed gradually increases. The air speed is fastest at the air outlet of the motor heat dissipation structure ring wall. In other words, the motor heat dissipation structure can expel the air inside the motor in a timely manner.
[0030] It should be noted that the shape of the two sides of the heat dissipation fin 113 along the circumferential direction is designed according to actual needs. For example, the shape of the two sides can be "C" or "S" shaped, such as... Figure 1 As shown, the two sides of the heat dissipation fin 113 along the circumferential direction are the first side 1132 and the second side 1133, both of which are "S" shaped. The thickness and number of heat dissipation fins 113 can be designed according to actual usage requirements such as the type of motor. For example, for small motors, the thickness of the heat dissipation fins 113 can be from 0.8mm to 2mm. The greater the thickness of the heat dissipation fins 113, the better the heat dissipation effect.
[0031] Specifically, with the center of the side plate 111 as the center, at the same position on the outer periphery of the same concentric circle, the concave and convex directions of the first side surface 1132 and the second side surface 1133 of each heat dissipation fin 113 can be the same; that is, at the same radial distance, the concave and convex directions of the first side surface 1132 and the second side surface 1133 of each heat dissipation fin 113 can be the same. This setting can further improve the heat dissipation efficiency of the motor heat dissipation structure and will not be affected by the forward and reverse rotation of the motor.
[0032] In some embodiments of this application, such as Figure 1 As shown, the width of the heat dissipation fin 113 gradually increases along the outward direction of the heat dissipation fin 113.
[0033] In this embodiment, the width of the heat dissipation fin 113 gradually increases from the center outward. Under the premise of ensuring the heat dissipation performance of the motor heat dissipation structure, the structure of the heat dissipation fin 113 can be optimized, the strength of the heat dissipation fin 113 can be improved, and thus the strength of the motor heat dissipation structure 10 can be increased.
[0034] In some embodiments of this application, such as Figure 1 As shown, the heat dissipation fin 113 has a reinforcing step 1131 at one end near the annular wall 112. The reinforcing step 1131 is used to strengthen the connection between the heat dissipation fin 113 and the annular wall 112.
[0035] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the annular wall 112 is provided with a plurality of partition columns 114 on the side facing the motor base 21, and an installation groove 115 is formed between adjacent partition columns 114. The position of the motor magnet 22 corresponds one-to-one with the position of the installation groove 115, and the motor magnet 22 is at least partially located in the installation groove 115.
[0036] In this embodiment, a portion of the motor's magnet is located within the mounting groove 115 formed between adjacent partition columns 114, which improves the space utilization within the motor. Furthermore, the partition columns 114 can be fixedly connected to the motor's steel ring, enhancing the connection strength between the motor's heat dissipation structure and the motor's outer rotor. Specifically, the partition columns 114 can be connected to the motor's steel ring by bonding or welding.
[0037] In some embodiments of this application, the air outlets 1121 on the motor heat dissipation structure are arrayed along the circumferential direction of the annular wall 112, which can improve the uniformity of air output from the air outlets during heat dissipation. Specifically, the air inlets 211 of the motor base 21 are also arrayed circumferentially, which can improve the uniformity of air intake to the motor.
[0038] In some embodiments of this application, a reinforcing connecting plate 116 is provided at the center of the inner side of the side plate; the heat dissipation fins 113 extend outward from the reinforcing connecting plate 116, and the motor shaft 23 passes through the center of the reinforcing connecting plate 116.
[0039] In some embodiments of this application, the reinforcing connecting plate 116 is provided with a plurality of weight-reducing grooves 1161, which are distributed in a circumferential array. In the embodiments of this application, the provision of weight-reducing grooves 1161 can reduce the weight of the reinforcing connecting plate 116 while ensuring the strength of the reinforcing connecting plate 116, thereby reducing the weight of the entire heat dissipation structure and thus reducing the weight of the motor.
[0040] In some embodiments of this application, the reinforcing connecting plate 116 is provided with a connecting hole 1162, which can be used to connect external UAV propellers. In the embodiments of this application, the connection hole 1162 is directly provided on the reinforcing connecting plate 116, which can reduce the need to set other connecting parts in other positions of the motor, thereby simplifying the structure and making the motor lighter and more compact.
[0041] An embodiment of the second aspect of this application provides a brushless motor, including the motor heat dissipation structure 10 described in the above embodiments.
[0042] In this embodiment, the motor cooling structure 10 is connected to the outer rotor of the motor. During motor operation, the motor cooling structure 10 and the outer rotor rotate together. Cold air is drawn in through the air inlet 211 on the side of the motor base 21, and heat exchange occurs inside the motor. During the rotation of the motor cooling structure 10, the arc-shaped heat dissipation fins 113 on both sides along the circumferential direction accelerate the outward ejection of the heat-exchanged air and its discharge from the air outlet 1121 of the motor cooling structure 10. Through this design, the operating motor can be effectively cooled. Compared to the existing motor cooling structure 10, the cooling efficiency can be improved by 8% to 10%, effectively reducing the probability of motor damage due to excessive internal heat. This allows the motor to continuously operate at high efficiency, thereby improving the cooling efficiency of the brushless motor.
[0043] Specifically, such as Figure 3 , Figure 4 , Figure 5 As shown, Figure 3 This is an isometric view of the brushless motor in an embodiment of this application; Figure 4 for Figure 3 A cross-sectional view of the brushless motor shown. Figure 5 for Figure 3 The image shows a side view of the brushless motor. The brushless motor also includes a shaft 23, an outer rotor, a motor base 21, a stator 24, and bearings 25. The outer rotor includes a steel ring 26 and a magnet 22. There are two bearings 25, which are mounted side by side on the shaft 23. The motor base 21 is mounted on the two bearings 25. The stator 24 is fixedly connected to the motor base 21. The magnet 22 is fixedly connected to the inner side of the steel ring 26, and the position of the magnet 22 is opposite to the position of the stator 24. The steel ring 26 is fixedly connected to the motor heat dissipation structure 10. When the steel ring 26 rotates, it drives the motor heat dissipation structure to rotate together.
[0044] An embodiment of the third aspect of this application provides a drone including the brushless motor described above.
[0045] In this embodiment, the motor cooling structure 10 is connected to the outer rotor of the motor. During motor operation, the motor cooling structure 10 and the outer rotor rotate together. Cold air is drawn in from the air inlet 211 on the side of the motor base 21, and heat exchange occurs inside the motor. During the rotation of the motor cooling structure 10, the arc-shaped heat dissipation fins 113 on both sides along the circumferential direction can accelerate the speed at which the heat-exchanged air is thrown outward and discharged from the air outlet 1121 of the motor cooling structure 10. Through the above configuration, the operating motor can be effectively cooled. Compared with the existing motor cooling structure 10, the heat dissipation efficiency can be improved by 8% to 10%, which can effectively reduce the probability of motor damage caused by excessive internal heat. This allows the brushless motor to continuously operate at high efficiency, thereby ensuring the safe and stable flight of the UAV.
[0046] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.
Claims
1. A motor heat dissipation structure, characterized in that, The connection to the outer rotor of the motor includes: Side plate (111) and an annular wall (112) located on the outer edge of the side plate (111), the annular wall (112) being provided with a plurality of air outlets (1121). The inner side of the side plate (111) is provided with a plurality of heat dissipation fins (113), which extend outward along the center of the side plate (111) and are distributed in a circumferential array; the two sides of the heat dissipation fins (113) in the circumferential direction are arc-shaped. When the motor is running, cold air is drawn into the motor from the air inlet (211) on the side of the motor base (21). The cold air undergoes heat exchange inside the motor. The heat dissipation fins (113) throw the heat-exchanged air outward and discharge it from the air outlet (1121) of the ring wall (112).
2. The motor heat dissipation structure according to claim 1, characterized in that, Along the direction in which the heat dissipation fins (113) extend outward, the width of the heat dissipation fins (113) gradually increases.
3. The motor heat dissipation structure according to claim 1, characterized in that, The heat dissipation fin (113) has a reinforcing step (1131) at one end near the ring wall (112), and the reinforcing step (1131) is used to strengthen the connection between the heat dissipation fin (113) and the ring wall (112).
4. The motor heat dissipation structure according to claim 1, characterized in that, The ring wall (112) has multiple partition columns (114) on the side facing the motor base (21), and an installation groove (115) is formed between adjacent partition columns (114). The position of the motor magnet (22) corresponds one-to-one with the position of the installation groove (115), and the motor magnet (22) is at least partially located in the installation groove (115).
5. The motor heat dissipation structure according to claim 1, characterized in that, The air outlets are arranged in an array along the circumferential direction of the annular wall (112).
6. The motor heat dissipation structure according to any one of claims 1-5, characterized in that, A reinforcing connecting plate (116) is provided at the center of the inner side of the side plate (111); The heat dissipation fins (113) extend outward from the reinforcing connecting plate (116), and the motor shaft (23) passes through the center of the reinforcing connecting plate (116).
7. The motor heat dissipation structure according to claim 6, characterized in that, The reinforcing connecting plate (116) is provided with a plurality of weight-reducing grooves (1161), which are distributed in a circumferential array.
8. The motor heat dissipation structure according to claim 6, characterized in that, The reinforcing connecting plate (116) is provided with a connecting hole (1162), which can be connected to an external UAV propeller.
9. A brushless motor, characterized in that, Includes the motor heat dissipation structure as described in any one of claims 1-8.
10. A drone, characterized in that, Includes the brushless motor as described in claim 9.