An outer rotor motor heat dissipation structure of a drone

Abstract

The application relates to a heat dissipation structure of an outer rotor motor of a UAV, which comprises potting glue filled in the end part of a stator winding, a heat dissipation pipeline comprising a first pipeline and a second pipeline, the first pipeline is embedded in the potting glue, the second pipeline is exposed outside the potting glue, and the first pipeline and the second pipeline are communicated, and a heat dissipation medium is injected in the heat dissipation pipeline. The utility model can achieve high heat dissipation effect, meet the lightweight and small size requirements of the motor of the UAV, and the potting glue can also fix the first pipeline, without adding additional mounting and positioning structures.

Description

Technical Field

[0001] This application relates to the field of motor heat dissipation technology, and in particular to a heat dissipation structure for an external rotor motor of a drone. Background Technology

[0002] Currently, drone motors primarily rely on their own structure for heat dissipation or on thermally conductive adhesive for encapsulation, resulting in relatively low heat dissipation capabilities. However, as drones evolve towards longer endurance, heavier payloads, and higher performance, the demand for motor power density is constantly increasing, leading to a surge in the need for motor cooling. Traditional drone motor cooling methods are no longer sufficient to meet these requirements. Designing complex cooling structures would result in excessive motor weight or size, failing to meet the lightweight and compact requirements of drone motors.

[0003] Therefore, there is a need to provide a heat dissipation structure for the external rotor motor of a drone that can meet the requirements of lightweight and small size. Utility Model Content

[0004] Therefore, it is necessary to provide a heat dissipation structure for the external rotor motor of a UAV, and the specific technical solution is as follows.

[0005] A heat dissipation structure for an external rotor motor of a drone includes: Encapsulating adhesive is applied to the ends of the stator windings; The heat dissipation pipe includes a first pipe and a second pipe; the first pipe is embedded in the sealing glue, the second pipe is exposed outside the sealing glue, and the first pipe and the second pipe are connected; the heat dissipation pipe is filled with a heat dissipation medium.

[0006] Furthermore, both ends of the stator winding are respectively filled with sealing glue.

[0007] Furthermore, the encapsulating adhesive includes an encapsulating adhesive body and heat dissipation fins; the heat dissipation fins are connected to the surface of the encapsulating adhesive body and protrude toward the side away from the stator winding.

[0008] Furthermore, multiple heat dissipation fins are attached to the surface of the encapsulating adhesive body.

[0009] Furthermore, the stator winding is wound on the stator core, and the stator core is sleeved on the stator base; the stator base is provided with a through slot; the second pipe extends to the through slot, so that the projection of the second pipe along the axis of the stator base partially or completely overlaps with the projection of the through slot along the axis of the stator base.

[0010] Furthermore, the second pipe is arranged in a continuously curved manner.

[0011] Furthermore, the second pipe includes multiple sub-pipes, which are U-shaped and connected end to end.

[0012] Furthermore, the stator base includes an installation end and a non-installation end, with the second pipe arranged at the non-installation end of the stator base.

[0013] Furthermore, the first pipe is connected to an inlet pipe; the second pipe is connected to an outlet pipe.

[0014] Furthermore, multiple stator windings are wound on the stator core, and the multiple stator windings are arranged in a ring. The first pipe is arc-shaped, and the projection of the first pipe along the axial direction of the stator core passes through the multiple stator windings.

[0015] Beneficial effects: The heat dissipation structure for the external rotor motor of a drone provided by this utility model can effectively dissipate heat from the stator winding by pre-embedding the first pipe in the potting compound, absorbing the heat generated by the stator winding through the potting compound and exchanging heat with the first pipe, and exchanging heat with the outside through the second pipe. The overall heat dissipation structure is simple, lightweight, and does not increase the size of the motor. While improving the heat dissipation effect, it can also meet the requirements of lightweight and small size of drone motor. In addition, the potting compound can also fix the first pipe, eliminating the need for additional installation and positioning structures. Attached Figure Description

[0016] 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 without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the stator; Figure 2 A partial cross-sectional view of the stator; Figure 3 This is a schematic diagram of the sealing and potting adhesive; Figure 4 This is a schematic diagram of the heat dissipation pipes; Figure 5 This is a sectional view of the stator.

[0018] Explanation of reference numerals in the attached diagram: 1. Encapsulating resin; 2. Heat dissipation pipe; 3. Stator winding; 4. Stator core; 5. Stator base; 11. Encapsulating adhesive body; 12. Heat dissipation fins; 13. Heat dissipation fin assembly; 21. First pipeline; 22. Second pipeline; 23. Sub-pipeline; 24. Inlet pipeline; 25. Outlet pipeline; 51. Through slot; 52. Mounting end; 53. Non-mounting end. Detailed Implementation

[0019] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0020] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 of this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0023] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] Example Reference Figure 1 and Figure 2 As shown, this embodiment provides a heat dissipation structure for the external rotor motor of a UAV, including a potting compound 1 and a heat dissipation pipe 2. It should be noted that the heat dissipation structure provided in this embodiment is mainly used to dissipate heat from the stator windings 3 of the external rotor motor.

[0026] Specifically, the sealing adhesive 1 is applied to the end of the stator winding 3. The sealing adhesive 1 is poured and molded at the end of the stator winding 3 to form a certain thickness; the specific potting process can refer to existing stator potting processes. The heat dissipation pipe 2 includes a first pipe 21 and a second pipe 22; the first pipe 21 is embedded in the sealing adhesive 1, and the second pipe 22 is exposed outside the sealing adhesive 1, with the first pipe 21 and the second pipe 22 connected; the heat dissipation pipe 2 is filled with a heat dissipation medium.

[0027] The potting compound 1 protects the stator winding 3. The thickness of the potting compound 1 is greater than the diameter of the first pipe 21, ensuring that the potting compound 1 completely covers the first pipe 21. This also allows the potting compound 1 to fix the first pipe 21 and transfer heat between it and the pipe. In this embodiment, the potting compound 1 absorbs the heat generated during the operation of the stator winding 3 and transfers it to the cooling medium in the first pipe 21. The cooling medium then flows to the second pipe 22 and exchanges heat with the outside environment, thereby cooling the medium and facilitating continued heat dissipation circulation.

[0028] In this embodiment, a pump body can be used to pump the cooling medium to achieve the circulation of the cooling medium in the first pipe 21 and the second pipe 22. Specifically, the pump body is connected to the first pipe 21 and the second pipe 22 respectively. The pump body can be installed in other positions of the motor, such as the housing.

[0029] In this embodiment, the cooling medium can be a liquid medium, such as water, ethylene glycol solution, or special cooling oil; or a gaseous medium.

[0030] The external rotor motor heat dissipation structure for a drone provided in this embodiment effectively dissipates heat from the stator winding 3 by pre-embedding the first pipe 21 into the potting compound 1. The potting compound 1 absorbs the heat generated by the stator winding 3 and exchanges heat with the first pipe 21, and exchanges heat with the outside through the second pipe 22. The overall heat dissipation structure is simple, lightweight, and does not increase the size of the motor. While improving the heat dissipation effect, it can also meet the requirements of lightweight and small size of drone motor. In addition, the potting compound 1 can also fix the first pipe 21 without the need for additional installation and positioning structures.

[0031] Specifically, the two ends of the stator winding 3 are respectively filled with sealing glue 1, which can dissipate heat from the two ends of the stator winding 3.

[0032] Specifically, refer to Figure 3 As shown, the encapsulating adhesive 1 includes an encapsulating adhesive body 11 and heat dissipation fins 12. The heat dissipation fins 12 are connected to the surface of the encapsulating adhesive body 11 and protrude toward the side away from the stator winding 3. By providing the heat dissipation fins 12, heat inside the encapsulating adhesive body 11 can be transferred outward, improving the heat dissipation effect of the encapsulating adhesive 1.

[0033] Specifically, multiple heat dissipation fins 12 arranged according to a certain rule can be provided on the surface of the encapsulating adhesive body 11. In this embodiment, multiple rings of heat dissipation fin groups 13 are provided, each ring of heat dissipation fin group 13 is coaxially arranged with the motor, and each ring of heat dissipation fin group 13 includes multiple evenly arranged heat dissipation fins 12, so that the surface of the encapsulating adhesive body 11 can be evenly dissipated through the evenly arranged heat dissipation fins 12, ensuring the uniformity of the temperature of the stator winding 3 and avoiding local overheating.

[0034] Specifically, continue to refer to Figure 2As shown, the stator winding 3 is wound on the stator core 4, and the stator core 4 is fitted onto the stator base 5. The stator base 5 is provided with a through slot 51. The second pipe 22 extends to the through slot 51, such that the projection of the second pipe 22 along the axis of the stator base 5 partially or completely overlaps with the projection of the through slot 51 along the axis of the stator base 5. The through slot 51 is located between the axis of the stator base 5 and the stator winding 3. There is airflow at the through slot 51. The airflow comes from the airflow during flight or the airflow generated by the negative pressure fan on the outer rotor as the outer rotor rotates. This can accelerate the heat exchange between the second pipe 22 and the outside, improve the heat dissipation effect, reduce the temperature of the cooling medium in the pipe, and allow the cooling medium to absorb more heat from the sealing glue 1 after circulating to the first pipe 21, thereby improving the heat dissipation effect of the stator winding 3 and avoiding additional increase in the size of the motor.

[0035] Specifically, the second pipe 22 is arranged in a continuously curved manner, which can form a regular or irregular continuous curved structure. This extends the length of the second pipe 22, increases the overlap area between the second pipe 22 and the through groove 51, thereby improving the heat dissipation effect of the second pipe 22 and further reducing the temperature of the cooling medium. (Refer to...) Figure 4 As shown, in this embodiment, the second pipe 22 includes a plurality of sub-pipes 23, the sub-pipes 23 being U-shaped and connected end to end.

[0036] Specifically, refer to Figure 5 As shown, the stator base 5 includes an mounting end 52 and a non-mounting end 53. The mounting end 52 is used to mount the stator base 5 onto other structures of the motor. The second pipe 22 is arranged at the non-mounting end 53 of the stator base 5 to avoid interference with the installation of the stator base 5.

[0037] Specifically, the first pipe 21 is connected to an inlet pipe 24; the second pipe 22 is connected to an outlet pipe 25.

[0038] Specifically, the stator core 4 is wound with multiple stator windings 3 arranged in a ring. The first pipe 21 is arc-shaped, and the projection of the first pipe 21 along the axial direction of the stator core 4 passes through multiple stator windings 3. This allows the first pipe 21 to pass through each stator winding 3 as much as possible, improving the uniformity of heat dissipation among the stator windings 3.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A heat dissipation structure for an external rotor motor of a drone, characterized in that, include: Encapsulating adhesive is applied to the ends of the stator windings; The heat dissipation pipe includes a first pipe and a second pipe; the first pipe is embedded in the sealing glue, the second pipe is exposed outside the sealing glue, and the first pipe and the second pipe are connected; the heat dissipation pipe is filled with a heat dissipation medium.

2. The heat dissipation structure for an external rotor motor of a UAV according to claim 1, characterized in that, Both ends of the stator winding are filled with sealing glue.

3. The heat dissipation structure for an external rotor motor of a UAV according to claim 1, characterized in that, The encapsulating adhesive includes an encapsulating adhesive body and heat dissipation fins; the heat dissipation fins are connected to the surface of the encapsulating adhesive body and protrude toward the side away from the stator winding.

4. The heat dissipation structure for an external rotor motor of a UAV according to claim 3, characterized in that, Multiple heat dissipation fins are attached to the surface of the encapsulating adhesive body.

5. The heat dissipation structure for an external rotor motor of a UAV according to claim 1, characterized in that, The stator winding is wound on the stator core, and the stator core is sleeved on the stator base; the stator base is provided with a through slot; the second pipe extends to the through slot, so that the projection of the second pipe along the axis of the stator base partially or completely overlaps with the projection of the through slot along the axis of the stator base.

6. The heat dissipation structure for an external rotor motor of a UAV according to claim 5, characterized in that, The second pipe is arranged in a continuously curved manner.

7. The heat dissipation structure for an external rotor motor of a UAV according to claim 6, characterized in that, The second pipe includes multiple sub-pipes, which are U-shaped and connected end to end.

8. The heat dissipation structure for an external rotor motor of a UAV according to claim 5, characterized in that, The stator base includes an installation end and a non-installation end, and the second pipe is arranged at the non-installation end of the stator base.

9. The heat dissipation structure for an external rotor motor of a UAV according to claim 1, characterized in that, The first pipe is connected to an inlet pipe; the second pipe is connected to an outlet pipe.

10. The heat dissipation structure for an external rotor motor of a UAV according to claim 1, characterized in that, Multiple stator windings are wound on the stator core, and the multiple stator windings are arranged in a ring. The first pipe is arc-shaped, and the projection of the first pipe along the axial direction of the stator core passes through the multiple stator windings.

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