Heat dissipation structure and outer rotor motor with same

Abstract

The utility model provides a kind of heat dissipation structure and the outer rotor motor with it, heat dissipation structure is used to heat dissipation to outer rotor motor, outer rotor motor includes outer rotor shell, rotating shaft and stator support, heat dissipation structure includes: fan blade subassembly, including first axial fan blade and second axial fan blade, outer rotor shell includes air inlet and air outlet, first axial fan blade and second axial fan blade are used to set on outer rotor shell and respectively correspond to located air inlet and air outlet, to make first axial fan blade and second axial fan blade rotate with outer rotor shell;Flow guide subassembly is set on stator support, flow guide subassembly includes the flow guide channel extending along the axis direction of rotating shaft, to make the air current entering from air inlet by flow guide channel carry out the heat inside outer rotor shell by air outlet.The utility model solves the problem that the inside of conventional outer rotor motor is closed in prior art, air in motor cannot flow and heat dissipation lead to internal temperature excessively high.

Description

Technical Field

[0001] This utility model relates to the field of motor heat dissipation, and more specifically, to a heat dissipation structure and an external rotor motor having the same. Background Technology

[0002] Currently, various measures are employed for heat dissipation and cooling of electric motors, with cooling strategies being particularly crucial for external rotor motors. Due to their unique structure, external rotor motors have a rotor located externally, with the end caps and housing rotating coaxially with the rotor, while the stator is fixed internally. While this design maximizes space utilization and achieves high power density, it also presents a significant challenge: the stator, as the motor's primary heat source, suffers from limited heat dissipation due to its enclosed internal space, easily leading to temperature increases that negatively impact motor performance and lifespan. To improve heat dissipation, existing technologies often employ the addition of fan blades to the shaft, using the rotation of these blades to drive airflow and thus achieve cooling.

[0003] However, the addition of extra structures in this solution not only complicates the motor design but may also lead to decreased system reliability, increased maintenance difficulty, and higher production costs. Furthermore, in open-type motors, although the end cap housing is not completely sealed, which theoretically should facilitate natural cooling, in reality, relying solely on natural convection or additional fan assistance is often insufficient to meet the heat dissipation requirements of high-power-density motors, especially in applications without waterproof or dustproof requirements. The motor's interior is directly connected to the outside air, which, while facilitating heat dissipation, also presents challenges in structural redundancy and cost control. Utility Model Content

[0004] The main purpose of this utility model is to provide a heat dissipation structure and an external rotor motor having the same, so as to solve the problem that the conventional external rotor motor in the prior art is closed inside, and the air inside the motor cannot flow to dissipate heat, resulting in excessively high internal temperature.

[0005] To achieve the above objectives, according to one aspect of the present invention, a heat dissipation structure is provided for dissipating heat from an external rotor motor. The external rotor motor includes an external rotor housing, a rotating shaft, and a stator support. The heat dissipation structure includes: a fan assembly comprising a first axial flow fan blade and a second axial flow fan blade; the external rotor housing includes an air inlet and an air outlet; the first and second axial flow fan blades are disposed on the external rotor housing and respectively located at the air inlet and air outlet, so that the first and second axial flow fan blades rotate with the external rotor housing; and a flow guiding assembly disposed on the stator support, the flow guiding assembly including a flow guiding channel extending along the axial direction of the rotating shaft, so that the airflow entering from the air inlet carries the heat inside the external rotor housing out through the air outlet via the flow guiding channel.

[0006] Furthermore, the external rotor motor also includes a rotor, and the external rotor housing includes: a first end cover and a second end cover, which are detachably connected to each other; a first axial flow fan is disposed on the first end cover; a second axial flow fan is disposed on the second end cover; and the rotor is disposed on the inner peripheral wall of the first end cover or the second end cover.

[0007] Furthermore, the first end cap includes a first supporting spoke and a cylindrical first cover body. The first supporting spoke is rotatably connected to a rotating shaft. The first axial flow fan blade includes a plurality of first axial flow blades, which are spaced apart circumferentially along the first supporting spoke. The two ends of each first axial flow blade are respectively connected to the inner peripheral wall of the first cover body and the outer peripheral wall of the first supporting spoke. The blade surface of the first axial flow blade has a first preset angle α with respect to the axis of the rotating shaft. The first preset angle α satisfies: 10°≤a≤45°. And / or, the first cover body, the first supporting spoke, and the plurality of first axial flow blades are integrally formed.

[0008] Furthermore, the second end cap includes a second supporting spoke and a cylindrical second cover body. The second supporting spoke is rotatably connected to the rotating shaft. The second axial flow fan blade includes a plurality of second axial flow blades, which are spaced apart circumferentially along the second supporting spoke. The two ends of each second axial flow blade are respectively connected to the inner peripheral wall of the second cover body and the outer peripheral wall of the second supporting spoke. The blade surface of the second axial flow blade has a second preset angle b with respect to the axis of the rotating shaft. The second preset angle b satisfies: 10°≤b≤45°. And / or, the second cover body, the second supporting spoke, and the plurality of second axial flow blades are integrally formed.

[0009] Furthermore, the stator support includes a third support spoke and a cylindrical support body. The third support spoke is sleeved on the rotating shaft. The flow guiding assembly includes: a flow guide vane, including multiple flow guide blades spaced circumferentially along the third support spoke. The two ends of each flow guide blade are connected to the inner circumferential wall of the support body and the outer circumferential wall of the third support spoke, respectively. The blade surface of each flow guide blade is arranged parallel to the axis of the rotating shaft. A reinforcing rib is cylindrical and located between the support body and the third support spoke, and is connected to the multiple flow guide blades.

[0010] Furthermore, the flow guiding component also includes: a plurality of first heat dissipation fins, which are spaced apart on the inner peripheral wall of the support body and arranged to avoid the flow guiding blades, and each first heat dissipation fin is arranged parallel to the axis of the rotating shaft; wherein, the first heat dissipation fin is plate-shaped and has a first preset thickness h1, the first preset thickness h1 satisfying: 1mm≤h1≤3mm.

[0011] Furthermore, the heat dissipation structure also includes a heat dissipation component, comprising a plurality of second heat dissipation fins spaced apart on the outer peripheral wall of the outer rotor housing, the plurality of second heat dissipation fins rotating with the outer rotor housing.

[0012] Furthermore, multiple second heat dissipation fins are arranged in a spiral shape on the outer peripheral wall of the outer rotor housing, and each second heat dissipation fin has a third preset angle c with the axis of the rotating shaft, the third preset angle c satisfying: 40°≤b≤70°; or, each second heat dissipation fin is arranged in an annular plate shape, and multiple second heat dissipation fins are spaced apart along the axial direction of the rotating shaft on the outer peripheral wall of the outer rotor housing.

[0013] Furthermore, the second heat dissipation fin is plate-shaped and has a second preset thickness h2, the second preset thickness h2 satisfying: 1mm≤h2≤3mm; and / or, there is a preset distance L between two adjacent second heat dissipation fins, the preset distance L satisfying: 20mm≤L≤40mm; and / or, the outer rotor housing and the multiple second heat dissipation fins are integrally formed.

[0014] According to another aspect of the present invention, an external rotor motor is provided, including the heat dissipation structure mentioned above.

[0015] The present invention provides a heat dissipation structure for cooling an external rotor motor. The external rotor motor includes an external rotor housing, a rotating shaft, and a stator support. The heat dissipation structure includes: a fan assembly comprising a first axial fan blade and a second axial fan blade; the external rotor housing includes an air inlet and an air outlet; the first and second axial fan blades are mounted on the external rotor housing and respectively located at the air inlet and air outlet, so that the first and second axial fan blades rotate with the external rotor housing; and a flow guiding assembly mounted on the stator support, comprising a flow guiding channel extending along the axial direction of the rotating shaft, so that the airflow entering from the air inlet carries the heat inside the external rotor housing out through the air outlet via the flow guiding channel.

[0016] By employing the technical solution of this embodiment, when the external rotor motor is running, the first and second axial flow fan blades generate axial airflow as the external rotor housing rotates. This allows air to flow into the external rotor housing from the air inlet, and the circumferential velocity of the airflow generated by the rotation of the first axial flow fan blades is guided into axial airflow through the guide channel. Simultaneously, the airflow blows onto the stator windings and stator core on the stator support, effectively dissipating heat. The heat is then discharged from the interior of the external rotor housing through the air outlet, improving the heat dissipation and cooling effect of the external rotor motor and increasing the motor's power density. This solves the problem of excessively high internal temperatures in conventional external rotor motors where the interior is enclosed and airflow is restricted.

[0017] As can be seen, by directly integrating the fan blades and airflow guide components into the outer rotor housing and stator support, the addition of extra heat dissipation structures is avoided, simplifying the overall design of the outer rotor motor, reducing production costs and assembly difficulty, and improving system reliability. It fully utilizes the existing components of the outer rotor motor, without requiring additional internal space, maintaining the compactness of the motor structure. It is also suitable for outer rotor motors of different sizes and power ratings, improving the applicability and flexibility of the solution. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0019] Figure 1 A schematic diagram of the overall structure of an embodiment of an external rotor motor according to the present invention is shown;

[0020] Figure 2 A half-sectional view of an embodiment of an external rotor motor according to the present invention is shown;

[0021] Figure 3 A schematic diagram of the structure of the first end cover provided in an embodiment of the external rotor motor according to the present invention is shown;

[0022] Figure 4 A schematic diagram of the structure of a first embodiment of the second end cover provided according to an embodiment of an external rotor motor of the present invention is shown;

[0023] Figure 5 A schematic diagram of the structure of a second embodiment of the second end cover provided according to an embodiment of the external rotor motor of the present invention is shown;

[0024] Figure 6 A schematic diagram of the assembled flow guide assembly and stator support provided in an embodiment of the external rotor motor according to the present invention is shown.

[0025] The above figures include the following reference numerals:

[0026] 1. Outer rotor housing; 2. Shaft; 3. Stator support; 300. Support body; 301. Third support spoke; 4. Rotor; 5. Stator core; 6. Stator winding;

[0027] 10. First end cap; 100. First cover body; 101. First support spoke; 11. Second end cap; 110. Second cover body; 111. Second support spoke;

[0028] 20. Fan blade assembly; 21. First axial flow fan blade; 210. First axial flow blade; 22. Second axial flow fan blade; 220. Second axial flow blade;

[0029] 30. Airflow guide assembly; 31. Airflow guide vane; 310. Airflow guide blade; 32. Reinforcing rib; 33. First heat dissipation fin;

[0030] 40. Heat dissipation component; 41. Second heat dissipation fin. Detailed Implementation

[0031] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] To address the problem of excessively high internal temperatures caused by the closed internal structure of conventional external rotor motors, which prevent airflow and heat dissipation, this invention provides a heat dissipation structure and an external rotor motor incorporating it.

[0033] Please refer to Figures 1 to 6 As shown, the present invention provides a heat dissipation structure for cooling an external rotor 4 motor. The external rotor 4 motor includes an external rotor housing 1, a rotating shaft 2, and a stator support 3. The heat dissipation structure includes: a fan assembly 20, including a first axial flow fan blade 21 and a second axial flow fan blade 22; the external rotor housing 1 includes an air inlet and an air outlet; the first axial flow fan blade 21 and the second axial flow fan blade 22 are mounted on the external rotor housing 1 and respectively located at the air inlet and the air outlet, so that the first axial flow fan blade 21 and the second axial flow fan blade 22 rotate with the external rotor housing 1; and a flow guiding assembly 30, mounted on the stator support 3, which includes a flow guiding channel extending along the axial direction of the rotating shaft 2, so that the airflow entering from the air inlet carries the heat inside the external rotor housing 1 out through the air outlet via the flow guiding channel.

[0034] By employing the technical solution of this embodiment, when the outer rotor 4 motor is running, the first axial flow fan blade 21 and the second axial flow fan blade 22 generate axial airflow as the outer rotor housing 1 rotates. This causes air to flow into the outer rotor housing 1 from the air inlet, and the circumferential velocity of the airflow generated by the rotation of the first axial flow fan blade 21 is guided into axial airflow through the guide channel. Simultaneously, the airflow blows onto the stator winding 6 and stator core 5, which are experiencing severe heat generation on the stator support 3, effectively dissipating heat. The heat is then discharged from the outer rotor housing 1 through the air outlet, improving the heat dissipation and cooling effect of the outer rotor 4 motor and increasing the motor's power density. This solves the problem in the prior art where the conventional outer rotor 4 motor is internally enclosed, preventing airflow and heat dissipation, leading to excessively high internal temperatures.

[0035] As can be seen, by directly integrating the fan blades and airflow guide assembly 30 onto the outer rotor housing 1 and stator support 3, the addition of extra heat dissipation structures is avoided, simplifying the overall design of the outer rotor 4 motor, reducing production costs and assembly difficulty, and improving system reliability. It fully utilizes the existing components of the outer rotor 4 motor, without requiring additional internal space, maintaining the compactness of the motor structure. It is also suitable for outer rotor 4 motors of different sizes and power ratings, improving the applicability and flexibility of the solution.

[0036] In this embodiment, the outer rotor 4 motor also includes a rotor 4, and the outer rotor housing 1 includes a first end cover 10 and a second end cover 11, which are detachably connected to each other. A first axial flow fan blade 21 is disposed on the first end cover 10, a second axial flow fan blade 22 is disposed on the second end cover 11, and the rotor 4 is disposed on the inner peripheral wall of the first end cover 10 or the second end cover 11.

[0037] By installing a first axial flow fan blade 21 and a second axial flow fan blade 22 on the first end cover 10 and the second end cover 11 respectively, a strong axial airflow is generated when the outer rotor 4 motor is running, as the fan blades rotate with the end cover. This airflow can enter the outer rotor housing 1 from the air inlet and quickly remove heat from the motor, especially the heat between the rotor 4 and the stator, effectively reducing the operating temperature of the outer rotor 4 motor and improving its heat dissipation performance. Furthermore, the detachable connection between the first end cover 10 and the second end cover 11 makes maintenance and repair of the outer rotor 4 motor more convenient. Without damaging the main structure of the motor, the end cover can be easily removed, the fan blade assembly 20 can be replaced or cleaned, and even the fan blade layout can be adjusted to adapt to different cooling requirements, improving the maintenance efficiency and flexibility of the motor.

[0038] Furthermore, by directly mounting the axial fan blades on the end cover, eliminating the need for additional supports or guide vanes, the entire motor structure becomes more compact, saving internal space. This is particularly advantageous for applications requiring high power density and a compact design. Compared to the traditional method of mounting a cooling fan on the motor shaft, integrating the fan blades into the end cover avoids additional moving parts, reduces potential failure points, and improves the reliability and lifespan of the external rotor 4-motor.

[0039] In this embodiment, axial flow fan blades are added directly to the end cover, and the blades of the axial flow fan blades are formed by changing the shape of the original support spokes of the end cover, without adding an additional heat dissipation structure, resulting in a simple and compact structure.

[0040] Specifically, such as Figure 3As shown, the first end cover 10 includes a first support spoke 101 and a cylindrical first cover body 100. The first support spoke 101 is rotatably connected to the rotating shaft 2. The first axial flow fan blade 21 includes a plurality of first axial flow blades 210, which are spaced apart circumferentially along the first support spoke 101. The two ends of each first axial flow blade 210 are respectively connected to the inner peripheral wall of the first cover body 100 and the outer peripheral wall of the first support spoke 101. The blade surface of the first axial flow blade 210 has a first preset angle α with respect to the axis of the rotating shaft 2. The first preset angle α satisfies: 10°≤a≤45°.

[0041] In this way, by setting multiple first axial flow blades 210, each first axial flow blade 210 has a first preset included angle α with the axis of the rotating shaft 2, and this included angle is between 10° and 45° to form an airflow angle of attack. As the first end cover 10 rotates, the first axial flow blades 210 will create a pressure difference on both sides, causing air to flow axially. This draws air from the front of the outer rotor 4 motor and flows into the inner side of the outer rotor 4 motor from the air inlet. This specific angle selection can optimize the axial distribution of airflow, making the airflow generated by the outer rotor 4 motor more concentrated in the axial direction, thereby effectively enhancing the axial airflow and improving heat dissipation efficiency.

[0042] In this embodiment, the first cover 100, the first support spokes 101, and the plurality of first axial flow blades 210 are integrally formed. This configuration, by modifying the shape of the original support spokes of the end cover to form an integral structure, avoids the need for additional heat dissipation structures, enhances the stability of the entire end cover structure, reduces performance degradation caused by loosening or wear at component connections, and improves the reliability and durability of the external rotor 4 motor. Simultaneously, it simplifies the assembly process, reduces manufacturing costs and the possibility of assembly errors, and improves production efficiency.

[0043] Specifically, such as Figure 4 As shown, the second end cap 11 includes a second supporting spoke 111 and a cylindrical second cover 110. The second supporting spoke 111 is rotatably connected to the rotating shaft 2. The second axial flow fan blade 22 includes a plurality of second axial flow blades 220, which are spaced apart circumferentially along the second supporting spoke 111. The two ends of each second axial flow blade 220 are respectively connected to the inner peripheral wall of the second cover 110 and the outer peripheral wall of the second supporting spoke 111. The blade surface of the second axial flow blade 220 has a second preset angle b with respect to the axis of the rotating shaft 2. The second preset angle b satisfies: 10°≤b≤45°.

[0044] The second preset angle b formed by the second axial flow blade 220 and the axis of the rotating shaft 2 is between 10° and 45°. This angle setting helps the airflow to form an optimal axial flow pattern inside the motor. Especially at the air outlet, it can accelerate the airflow discharge, thereby improving heat dissipation efficiency and cooling effect.

[0045] In this embodiment, the second cover 110, the second support spokes 111, and the multiple second axial flow blades 220 are integrally formed. This configuration, by modifying the shape of the original support spokes of the end cover to form an integral structure, avoids the need for additional heat dissipation structures, enhances the stability of the entire end cover structure, reduces performance degradation caused by loosening or wear at component connections, and improves the reliability and durability of the external rotor 4 motor. It also simplifies the assembly process, reduces manufacturing costs and the possibility of assembly errors, and improves production efficiency.

[0046] In this embodiment, as Figure 6 As shown, the stator support 3 includes a third support spoke 301 and a cylindrical support body 300. The third support spoke 301 is sleeved on the rotating shaft 2. The flow guiding assembly 30 includes a flow guide vane 31 and a reinforcing rib 32. The flow guide vane 31 includes a plurality of flow guide blades 310 spaced circumferentially along the third support spoke 301. The two ends of each flow guide blade 310 are respectively connected to the inner peripheral wall of the support body 300 and the outer peripheral wall of the third support spoke 301. The blade surface of each flow guide blade 310 is arranged parallel to the axis of the rotating shaft 2. The reinforcing rib 32 is cylindrical and is located between the support body 300 and the third support spoke 301 and connected to the plurality of flow guide blades 310.

[0047] The guide vanes 310, arranged parallel to the axis of the rotating shaft 2, form an axially extending guide channel. This guides the circumferential velocity of the airflow entering from the air inlet to axial flow, preventing disordered diffusion of airflow inside the motor and improving the efficiency of linear airflow. This allows for more effective heat removal from the outer rotor 4 motor, achieving a uniform and efficient cooling effect. The cylindrical reinforcing ribs 32, located between the support body 300 and the third support spokes 301, not only improve the overall mechanical strength of the stator support 3 but also, through their connection with multiple guide vanes 310, form a stable and robust structural network capable of withstanding vibrations and stresses during the operation of the outer rotor 4 motor, ensuring the smoothness and reliability of motor operation.

[0048] In this embodiment, the stator support 3 and the airflow guide assembly 30 are integrally formed. Airflow guide vanes 31 are added directly to the original stator support 3 of the external rotor motor. The blades of the airflow guide vanes 31 are formed by changing the shape of the original support spokes of the stator support 3, without adding an additional heat dissipation structure, resulting in a simple and compact structure. This integrated design of the airflow guide vanes 310 with the third support spokes 301 and the support body 300 simplifies the overall assembly process. Furthermore, during maintenance, the entire assembly can be disassembled, facilitating the inspection and cleaning of internal components, thus improving maintenance efficiency and convenience.

[0049] Specifically, the flow guiding component 30 further includes: a plurality of first heat dissipation fins 33, which are spaced apart on the inner peripheral wall of the support body 300 and are arranged to avoid the flow guiding blades 310. Each first heat dissipation fin 33 is arranged parallel to the axis of the rotating shaft 2. The first heat dissipation fin 33 is plate-shaped and has a first preset thickness h1, which satisfies: 1mm≤h1≤3mm.

[0050] The first heat dissipation fin 33 significantly increases the heat dissipation surface area in contact with airflow. Especially when the outer rotor 4 motor is running, the airflow flows along the first heat dissipation fin 33, greatly improving the heat dissipation efficiency, helping to reduce the internal temperature of the outer rotor 4 motor, and improving motor efficiency and reliability. The plate-shaped first heat dissipation fin 33, with a thickness between 1mm and 3mm, ensures effective heat transfer from the inside of the motor to the first heat dissipation fin 33. At the same time, since the first heat dissipation fin 33 is parallel to the axis, the airflow can flow smoothly, avoiding flow resistance, and making it easier for heat to be carried out of the outer rotor 4 motor.

[0051] Furthermore, the integrated design of the first heat dissipation fin 33 and the support body 300 simplifies the maintenance of the external rotor 4 motor. When cleaning dust or checking the motor condition, there is no need to disassemble the heat dissipation fins, improving the convenience and efficiency of maintenance. Additionally, the thickness and spacing of the first heat dissipation fin 33 can be adjusted according to specific operating conditions and dimensions to adapt to external rotor 4 motors with different power levels and cooling requirements, ensuring the flexibility and wide applicability of the heat dissipation solution.

[0052] In this embodiment, as Figure 4 and Figure 5As shown, the heat dissipation structure also includes a heat dissipation assembly 40, which includes a plurality of second heat dissipation fins 41 spaced apart on the outer peripheral wall of the outer rotor housing 1. The plurality of second heat dissipation fins 41 rotate with the outer rotor housing 1. In this way, the arrangement of the second heat dissipation fins 41 effectively increases the heat dissipation area of ​​the outer surface of the motor. When the outer rotor housing 1 rotates, these second heat dissipation fins 41 come into contact with the air, causing the surrounding air disturbance to flow from front to back along the axial direction of the outer rotor 4 motor, forming an outer airflow. This increases the heat dissipation effect of the outer side of the outer rotor housing 1, enabling the heat generated by the outer rotor 4 motor to be dissipated from the cylindrical section, significantly improving the heat dissipation efficiency of the motor.

[0053] Unlike traditional static heat sinks, the design of the second heat sink fin 41 utilizes the rotational motion of the outer rotor housing 1, creating a fan-like effect that further enhances airflow and improves cooling efficiency. This effect is particularly pronounced for large-diameter motors. Furthermore, the spaced arrangement of multiple second heat sink fins 41 generates a turbulence effect as the outer rotor housing 1 rotates, helping to break up static air layers, promoting airflow between the fins, increasing convective heat dissipation, and improving the overall heat exchange capacity of the motor system.

[0054] In the first embodiment of the second heat dissipation fin 41 of this application, as Figure 4 As shown, multiple second heat dissipation fins 41 are arranged in a spiral shape on the outer peripheral wall of the outer rotor housing 1. Each second heat dissipation fin 41 has a third preset angle c with the axis of the rotating shaft 2. The third preset angle c satisfies: 40°≤b≤70°.

[0055] As the outer rotor housing 1 rotates, the multiple spirally arranged second heat dissipation fins 41 utilize the tangential force generated by the third preset included angle c to draw in surrounding air and allow it to flow along the spiral path, creating a propeller-like airflow effect. This significantly enhances the lateral airflow, promotes effective contact between the air outside the outer rotor housing 1 and the second heat dissipation fins 41, and improves heat dissipation efficiency. Furthermore, the spirally arranged second heat dissipation fins 41 have a larger surface area than those arranged in a straight line, allowing for more efficient utilization of the cooling effect brought by airflow. This design significantly improves heat dissipation performance, especially when the outer rotor 4 motor rotates at high speed.

[0056] Furthermore, the spiral arrangement helps to disperse airflow and reduce airflow concentration in one direction, thereby reducing noise generated by rapid airflow and improving the quietness of the motor operation. At the same time, the spiral structure has good mechanical properties, which can enhance the structural strength of the outer rotor housing 1, reduce vibration generated under high-speed rotation conditions, and ensure the smooth operation of the outer rotor 4 motor.

[0057] In a second embodiment of the second heat dissipation fin 41 of this application, as Figure 5 As shown, each of the second heat dissipation fins 41 is arranged in an annular plate shape, and multiple second heat dissipation fins 41 are spaced apart on the outer peripheral wall of the outer rotor housing 1 along the axial direction of the rotating shaft 2.

[0058] The spaced arrangement of the annular plate-shaped second heat dissipation fins 41 ensures that heat is released evenly along the axial direction of the rotating shaft 2, avoiding the formation of hot spots, improving heat dissipation uniformity, and contributing to the long-term stable operation of the motor. Compared to a spiral arrangement, the annular plate-shaped second heat dissipation fins 41 encounter less air resistance during rotation, which means lower losses and higher overall efficiency for the outer rotor 4 motor at high speeds. Furthermore, the annular plate-shaped second heat dissipation fins 41 have a simpler design, are easier to manufacture and assemble, reducing production costs and minimizing the error rate during assembly.

[0059] In this embodiment, the second heat dissipation fin 41 is plate-shaped and has a second preset thickness h2, which satisfies the following condition: 1mm ≤ h2 ≤ 3mm. The design of the second preset thickness h2 ensures sufficient heat conduction area while maintaining lightweight characteristics. A thickness of 1mm to 3mm can ensure good heat conduction performance without significantly increasing the total weight of the external rotor 4 motor, which helps to improve the power density and efficiency of the motor.

[0060] In this embodiment, a preset distance L is provided between two adjacent second heat dissipation fins 41, wherein the preset distance L satisfies: 20mm ≤ L ≤ 40mm. The preset distance L allows for adequate airflow, avoids airflow obstruction, and ensures that airflow can be evenly distributed and pass through each second heat dissipation fin 41, improving the consistency and efficiency of heat dissipation. This distance also helps prevent dust and impurities from accumulating between the second heat dissipation fins 41, keeping the heat dissipation channels unobstructed.

[0061] In this embodiment, the outer rotor housing 1 and the multiple second heat dissipation fins 41 are integrally formed. The integrally formed second heat dissipation fins 41 with the outer rotor housing 1 not only simplify the manufacturing process and reduce production costs, but also improve the rigidity and stability of the overall structure, enhancing the durability and vibration resistance of the outer rotor 4 motor under high-speed rotation. Furthermore, the thickness and spacing design of the plate-shaped second heat dissipation fins 41, along with the integrated structure with the outer rotor housing 1, work together to reduce the air resistance encountered by the outer rotor 4 motor during rotation, allowing the outer rotor 4 motor to consume less energy at the same speed, thus improving the motor's energy efficiency.

[0062] According to another aspect of the present invention, an external rotor 4-motor is provided, including the heat dissipation structure mentioned above.

[0063] By adopting the technical solution of this application, the external rotor 4 motor can form an axial airflow when the external rotor 4 rotates through the axial flow blades and guide vanes included in the heat dissipation structure. This effectively increases the airflow speed inside the motor, quickly removes the heat generated during motor operation, significantly improves cooling efficiency, and ensures that the motor can maintain a low temperature even under high power density operation.

[0064] This invention's heat dissipation solution directly utilizes existing structures, such as the end cap's supporting spokes and the housing, optimizing their shape and function without requiring additional heat dissipation devices. This results in a more compact motor design, saving internal space and reducing weight, which is beneficial for improving the motor's power density and torque density. The design without additional heat dissipation mechanisms reduces the complexity of the motor's internal structure, lowers the risk of system failure due to heat dissipation system malfunctions, and improves the motor's reliability and stability. By effectively controlling the motor's internal temperature, it avoids performance degradation and component damage caused by overheating, thereby extending the motor's lifespan and reducing maintenance and replacement costs.

[0065] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0066] When the external rotor 4 motor operates, the first axial flow fan blade 21 and the second axial flow fan blade 22 generate axial airflow as the external rotor housing 1 rotates. This causes air to flow into the external rotor housing 1 from the air inlet, and the circumferential velocity of the airflow generated by the rotation of the first axial flow fan blade 21 is guided into axial airflow through the guide channel. Simultaneously, the airflow blows onto the stator winding 6 and stator core 5, which are experiencing significant heat generation on the stator support 3, effectively dissipating heat. The heat is then discharged from the external rotor housing 1 through the air outlet, improving the heat dissipation and cooling effect of the external rotor 4 motor and increasing its power density. This solves the problem of excessively high internal temperatures caused by the closed internal structure of conventional external rotor 4 motors in the prior art, where air cannot circulate for heat dissipation. Therefore, by directly integrating the fan blades and guide assembly 30 onto the external rotor housing 1 and stator support 3, the addition of additional heat dissipation structures is avoided, simplifying the overall design of the external rotor 4 motor, reducing production costs and assembly difficulty, and improving system reliability. It makes full use of the existing components of the external rotor 4 motor, without taking up additional internal space, maintaining the compactness of the motor structure. It is also applicable to external rotor 4 motors of different sizes and power levels, improving the applicability and flexibility of the solution.

[0067] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0068] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0069] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0072] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. 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 heat dissipation structure for dissipating heat from an external rotor motor, the external rotor motor comprising an external rotor housing (1), a rotating shaft (2), and a stator support (3), characterized in that, The heat dissipation structure includes: The fan blade assembly (20) includes a first axial flow fan blade (21) and a second axial flow fan blade (22). The outer rotor housing (1) includes an air inlet and an air outlet. The first axial flow fan blade (21) and the second axial flow fan blade (22) are disposed on the outer rotor housing (1) and are respectively located at the air inlet and the air outlet, so that the first axial flow fan blade (21) and the second axial flow fan blade (22) rotate with the outer rotor housing (1). A flow guide assembly (30) is disposed on the stator support (3). The flow guide assembly (30) includes a flow guide channel extending along the axial direction of the rotating shaft (2) so that the airflow entering from the air inlet carries the heat inside the outer rotor housing (1) out through the air outlet via the flow guide channel.

2. The heat dissipation structure according to claim 1, characterized in that, The external rotor motor further includes a rotor (4), and the external rotor housing (1) includes: The first end cover (10) and the second end cover (11) are detachably connected to each other. The first axial flow fan blade (21) is disposed on the first end cover (10), the second axial flow fan blade (22) is disposed on the second end cover (11), and the rotor (4) is disposed on the inner peripheral wall of the first end cover (10) or the second end cover (11).

3. The heat dissipation structure according to claim 2, characterized in that, The first end cap (10) includes a first support spoke (101) and a cylindrical first cover body (100). The first support spoke (101) is rotatably connected to the rotating shaft (2). The first axial flow fan blade (21) includes: Multiple first axial flow blades (210) are arranged circumferentially along the first support spokes (101), and the two ends of each first axial flow blade (210) are respectively connected to the inner peripheral wall of the first cover (100) and the outer peripheral wall of the first support spokes (101). Wherein, the blade surface of the first axial flow blade (210) has a first preset angle α between the axis of the rotating shaft (2), and the first preset angle α satisfies: 10°≤a≤45°; and / or, the first cover (100), the first support spoke (101) and the plurality of first axial flow blades (210) are integrally formed structures.

4. The heat dissipation structure according to claim 2, characterized in that, The second end cap (11) includes a second support spoke (111) and a cylindrical second cover body (110). The second support spoke (111) is rotatably connected to the rotating shaft (2). The second axial flow fan blade (22) includes: Multiple second axial flow blades are arranged at circumferential intervals along the second support spokes (111), and the two ends of each second axial flow blade are respectively connected to the inner peripheral wall of the second cover (110) and the outer peripheral wall of the second support spokes (111); Wherein, the blade surface of the second axial flow blade has a second preset angle b between it and the axis of the rotating shaft (2), and the second preset angle b satisfies: 10°≤b≤45°; and / or, the second cover (110), the second support spoke (111) and the plurality of second axial flow blades are integrally formed structures.

5. The heat dissipation structure according to claim 1, characterized in that, The stator support (3) includes a third support spoke (301) and a cylindrical support body (300). The third support spoke (301) is sleeved on the rotating shaft (2). The flow guiding assembly (30) includes: The guide vane (31) includes a plurality of guide blades (310) arranged circumferentially along the third support spoke (301). The two ends of each guide blade (310) are respectively connected to the inner peripheral wall of the support body (300) and the outer peripheral wall of the third support spoke (301). The blade surface of each guide blade (310) is arranged parallel to the axis of the rotating shaft (2). The reinforcing rib (32) is cylindrical in shape and is located between the support body (300) and the third support spoke (301) and connected to the plurality of guide vanes (310).

6. The heat dissipation structure according to claim 5, characterized in that, The flow guiding component (30) further includes: Multiple first heat dissipation fins (33) are spaced apart on the inner peripheral wall of the support body (300) and are arranged to avoid the guide vanes (310). Each first heat dissipation fin (33) is arranged parallel to the axis of the rotating shaft (2). The first heat dissipation fin (33) is plate-shaped and has a first preset thickness h1, which satisfies: 1mm≤h1≤3mm.

7. The heat dissipation structure according to claim 1, characterized in that, The heat dissipation structure also includes: The heat dissipation assembly (40) includes a plurality of second heat dissipation fins (41) spaced apart on the outer peripheral wall of the outer rotor housing (1), and the plurality of second heat dissipation fins (41) rotate with the outer rotor housing (1).

8. The heat dissipation structure according to claim 7, characterized in that, Multiple second heat dissipation fins (41) are spirally arranged on the outer peripheral wall of the outer rotor housing (1), and each second heat dissipation fin (41) has a third preset angle c with the axis of the rotating shaft (2), wherein the third preset angle c satisfies: 40°≤b≤70°; or, Each of the second heat dissipation fins (41) is arranged in an annular plate shape, and a plurality of the second heat dissipation fins (41) are spaced apart along the axial direction of the rotating shaft (2) on the outer peripheral wall of the outer rotor housing (1).

9. The heat dissipation structure according to claim 7, characterized in that, The second heat dissipation fin (41) is plate-shaped and has a second preset thickness h2, wherein the second preset thickness h2 satisfies: 1mm ≤ h2 ≤ 3mm; and / or, There is a preset distance L between two adjacent second heat dissipation fins (41), the preset distance L satisfying: 20mm≤L≤40mm; and / or, The outer rotor housing (1) and the multiple second heat dissipation fins (41) are integrally formed.

10. An external rotor motor, characterized in that, The heat dissipation structure includes any one of claims 1 to 9.

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