Motor heat dissipation structure of high-pressure unmanned aerial vehicle

Abstract

The application relates to a motor heat dissipation structure of a high-voltage unmanned plane, which comprises a motor body and a heat dissipation system, the motor body comprises a motor rotor assembly, the bottom of the motor rotor assembly is detachably connected with a motor rear cover assembly, a stator potting body and a motor stator assembly are arranged in the motor rotor assembly, the heat dissipation system comprises a heat conduction plate, a heat pipe and an aluminum shovel radiator, the heat conduction plate is in thermal contact with the coil end of the motor stator assembly, at least one heat conduction surface of the heat conduction plate is exposed to the bottom surface of the stator potting body, the heat absorption end of the heat pipe is in close thermal contact with the exposed heat conduction surface, and the heat dissipation end of the heat pipe is in close thermal contact with the aluminum shovel radiator. The combination of the heat conduction plate and the heat pipe realizes rapid and long-distance heat transportation, a direct channel for coil heat is established, the potting heat barrier is broken through, the motor and the radiator are independently installed, the path for conducting heat through the carbon pipe is cut off, and other components of the unmanned plane are protected.

Description

Technical Field

[0001] This application relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a motor heat dissipation structure for a high-voltage UAV. Background Technology

[0002] As drone propulsion systems become increasingly high-voltage, the increased power density of motors leads to a dramatic increase in heat generation. High-voltage motors in drones commonly employ potting processes to ensure protection and reliability; however, the poor thermal conductivity of potting materials creates a "thermal barrier," causing heat to accumulate in the coils and hindering further increases in motor power density. Existing cooling solutions, such as adding external heat sinks, increase the size of the system, and liquid cooling systems are complex and bulky. Furthermore, traditional installation methods easily allow heat from the motor to be conducted to the entire fuselage through structural components, affecting the lifespan of other electronic devices. Utility Model Content

[0003] Therefore, it is necessary to provide a motor heat dissipation structure for a high-voltage UAV to overcome the defects mentioned in the background art.

[0004] A heat dissipation structure for a high-voltage unmanned aerial vehicle (UAV) motor includes a motor body and a heat dissipation system. The motor body includes a motor rotor assembly with a motor rear cover assembly detachably connected to its bottom. The motor rotor assembly contains a stator potting body and a motor stator assembly. The heat dissipation system includes a heat spreader, a heat pipe, and an aluminum shovel radiator. The heat spreader is in thermal contact with the coil ends of the motor stator assembly, and at least one of its heat-conducting surfaces is exposed on the bottom surface of the stator potting body. The heat-absorbing end of the heat pipe is in close thermal contact with the exposed heat-conducting surface, and its heat-dissipating end is in close thermal contact with the aluminum shovel radiator.

[0005] As a preferred embodiment of the motor heat dissipation structure for the medium- and high-voltage UAV of this invention, the heat-absorbing ends of the heat spreader and heat pipe are accommodated within the maximum radial projection contour of the motor body.

[0006] As a preferred embodiment of the motor heat dissipation structure for the medium- and high-voltage UAV of this invention, thermally conductive silicone grease is filled between the heat spreader and the heat-absorbing end of the heat pipe. As a preferred embodiment of the motor heat dissipation structure for the medium- and high-voltage UAV of this invention, a heat pipe cover plate is provided between the heat pipe and the motor rear cover assembly.

[0007] As a preferred embodiment of the motor heat dissipation structure for the medium- and high-voltage unmanned aerial vehicle of this invention, the heat pipe is a vacuum tube containing a phase change working fluid. As a preferred embodiment of the motor heat dissipation structure for the medium- and high-voltage UAV of this invention, the motor body and the aluminum shovel heat sink are respectively connected to the carbon tube via a locking assembly.

[0008] As a preferred embodiment of the motor heat dissipation structure for the medium- and high-voltage UAV of this invention, the aluminum shovel heat sink is arranged below the motor blades.

[0009] The beneficial effects of this utility model are: This invention achieves rapid and long-distance heat transport through the combination of heat spreader and heating tube, establishing a direct channel for coil heat to reach the outside, breaking through the potting thermal barrier, and fundamentally solving the heat dissipation bottleneck of potted motors. The motor and radiator are installed independently, cutting off the path of heat conduction through carbon tubes, protecting other components of the UAV. All heat dissipation components are built into the motor projection range without any external protrusions, and do not affect the aerodynamic layout. Attached Figure Description

[0010] 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.

[0011] Figure 1 This is a schematic diagram of the overall structure of the motor system according to an embodiment of this application; Figure 2 This is an exploded structural diagram of the motor system according to an embodiment of this application; Figure 3 This is a cross-sectional structural diagram of the motor system according to an embodiment of this application; Explanation of reference numerals in the attached figures: 1000, Blade assembly; 1100, Blade locking screw; 1200, Blade; 2000, Motor body; 2100, Motor rotor assembly; 2200, Stator potting compound; 2300, Motor stator assembly; 2400, Motor rear cover assembly; 3000, Heat dissipation system; 3100, Heat spreader; 3200, Heat pipe; 3300, Heat pipe cover screws; 3400, Heat pipe cover; 3500, Aluminum spatula radiator; 4000, Locking assembly; 4100, Motor pipe clamp seat locking screw; 4200, Pipe clamp seat assembly; 4300, Radiator clamping ring; 4400, Radiator locking screw; 4500, Carbon tube. Detailed Implementation

[0012] 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] According to one aspect of this application, embodiments of this application provide a motor heat dissipation structure for a high-voltage unmanned aerial vehicle (UAV), please refer to the following: Figures 1 to 3 The motor cooling structure of this high-voltage UAV includes a blade assembly 1000, a motor body 2000, a cooling system 3000, and a locking assembly 4000. The blade assembly 1000 is mounted on top of the motor body 2000, the cooling system 3000 is mounted at the bottom inside the motor body 2000, and the locking assembly 4000 is used to lock the motor body 2000 and the cooling system 3000. The motor body 2000 includes a motor rotor assembly 2100, the bottom of which is detachably connected to a motor rear cover assembly 24. 00, the motor rotor assembly 2100 is provided with a stator potting body 2200 and a motor stator assembly 2300. The heat dissipation system 3000 includes a heat spreader 3100, a heat pipe 3200 and an aluminum shovel radiator 3500. The heat spreader 3100 is in thermal contact with the coil end of the motor stator assembly 2300, and at least one of its heat-conducting surfaces is exposed on the bottom surface of the stator potting body 2200. The heat-absorbing end of the heat pipe 3200 is in close thermal contact with the exposed heat-conducting surface, and its heat dissipation end is in close thermal contact with the aluminum shovel radiator 3500.

[0019] In this embodiment, the motor heat dissipation structure of the high-voltage UAV includes a propeller assembly 1000, a motor body 2000, a heat dissipation system 3000, and a locking assembly 4000. The stator potting body 2200 in the motor body 2000 is the potting compound for the motor stator assembly 2300. The potting material has poor thermal conductivity, causing heat to accumulate in the coil of the motor stator assembly 2300. A heat spreader 3100 is disposed within the potting compound, with one end in thermal contact with the coil end and the other end exposed and not exposed to the potting compound. The potting compound is used to conduct heat. The heat-absorbing end of the heat pipe 3200 is in close thermal contact with the exposed heat spreader 3100, and its heat-dissipating end is in close thermal contact with the aluminum shovel radiator 3500, transferring heat to the aluminum shovel radiator 3500. The rotation of the blade assembly 1000 utilizes convection to provide air cooling for the aluminum shovel radiator 3500, realizing rapid and long-distance heat transport. This establishes a direct channel for the coil heat to reach the outside, breaking through the potting thermal barrier and fundamentally solving the heat dissipation bottleneck of the potted motor.

[0020] In one embodiment of this application, please refer to Figures 1 to 3 The heat absorption ends of the heat spreader 3100 and heat pipe 3200 are housed within the maximum radial projection contour of the motor body 2000. The main heat dissipation components are built into the motor projection range without any external protrusions, without increasing the radial installation size of the motor, and without affecting the aerodynamic layout.

[0021] In one embodiment of this application, the heat spreader 3100 is flatly attached to the end of the coil. The heat spreader 3100 is made of a high thermal conductivity material to ensure that it can quickly and uniformly absorb the heat generated by the coil. A layer of high-performance thermal grease is uniformly coated on the lower surface of the heat spreader 3100. The thermal grease is used to fill the uneven gaps between the heat spreader 3100 and the heat pipe 3200 to minimize the contact thermal resistance. The heat-absorbing end of the heat pipe 3200 is flatly placed on the thermal grease-coated surface of the heat spreader 3100.

[0022] In one embodiment of this application, please refer to Figure 2 and Figure 3 A heat pipe cover plate 3400 is provided between the heat pipe 3200 and the motor rear cover assembly 2400. The heat pipe cover plate 3400 covers the heat absorption end of the heat pipe 3200, and then the heat pipe cover plate 3400 is locked and fixed to the motor rear cover assembly 2400 using heat pipe cover plate screws 3300. By tightening the heat pipe cover plate screws 3300, the heat pipe cover plate 3400 will generate a uniform clamping force on the heat pipe 3200. This force is ultimately transmitted to the heat spreader 3100, thereby ensuring that a stable and tight physical contact is formed between the heat pipe 3200, the thermal grease and the heat spreader 3100, forming a heat conduction chain with extremely low thermal resistance.

[0023] In one embodiment of this application, the heat pipe 3200 is a vacuum tube containing a phase change working fluid to facilitate heat conduction.

[0024] In one embodiment of this application, one end of the aluminum shovel heat sink 3500 is connected to the heat dissipation end of the heat pipe 3200, and the other end is provided with a heat dissipation fin group to increase the heat dissipation area. The heat dissipation fin group can be coated with thermal grease to enhance thermal conductivity.

[0025] In one embodiment of this application, please refer to Figures 1 to 3The motor body 2000 and the aluminum shovel radiator 3500 are respectively connected to the carbon tube 4500 through the locking assembly 4000. The locking assembly 4000 includes a motor tube clamp seat locking screw 4100 and a tube clamp seat assembly 4200. The motor body 2000 is firmly connected to the carbon tube 4500 through the motor tube clamp seat locking screw 4100 and the tube clamp seat assembly 4200. The locking assembly 4000 also includes a radiator clamping ring 4300 and a radiator locking screw 4400. The aluminum shovel radiator 3500 is connected to the carbon tube 4500 through the radiator clamping ring 4300 and the radiator locking screw 4400. The motor body 2000 and the aluminum shovel radiator 3500 are respectively and independently fixed on the carbon tube 4500. The two are only connected through the heat pipe 3200, rather than being structurally rigidly connected. This modular design not only simplifies assembly but also effectively cuts off the path of heat conduction through metal structural components, avoiding thermal interference from motor heat to the carbon tube 4500 and adjacent electronic control units, thus improving the overall reliability of the system.

[0026] In one embodiment of this application, please refer to Figures 1 to 3 The aluminum shovel heat sink 3500 is located below the propeller assembly 1000, which includes a propeller 1200. The propeller assembly 1000 is connected to the motor body 2000 by a propeller screw 1100. The aluminum shovel heat sink 3500 is located directly below the propeller 1200. It can directly use the downward flow generated by the rotation of the propeller 1200 for forced convection heat dissipation. It has high heat dissipation efficiency and does not depend on the flight speed of the UAV. Especially in the hovering condition, it can still maintain excellent heat dissipation performance without the need for additional power to drive the fan.

[0027] Working Principle: When the motor is running, the stator coils generate heat, which is rapidly absorbed by the directly attached heat spreader 3100 and efficiently transferred to the heat-absorbing end of the heat pipe 3200 via thermal grease through its exposed surface. This process successfully overcomes the thermal barrier formed by the stator potting compound 2200. The phase change working fluid inside the heat pipe 3200 evaporates at the heat-absorbing end, and the vapor flows to the heat-dissipating end under a small pressure difference. The vapor condenses at the heat-dissipating end, and the released latent heat is transferred to the aluminum shovel radiator 3500 through the pipe wall. The fin group of the aluminum shovel radiator 3500 greatly increases the heat dissipation area. At this time, the strong downward jet generated by the blades 1200 blows vertically across the fin surface, performing efficient forced convection heat transfer and rapidly carrying the heat away from the environment. The condensed liquid working fluid flows back to the heat absorption end through the internal capillary structure of the heat pipe 3200, and the cycle repeats, constructing a complete, efficient and compact heat dissipation path of heat source → heat spreader 3100 → heat pipe 3200 → aluminum spatula radiator 3500 → forced air cooling, which solves the heat dissipation problem of high-pressure potted motor.

[0028] 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.

[0029] 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 motor heat dissipation structure for a high-voltage unmanned aerial vehicle (UAV), comprising a motor body and a heat dissipation system, wherein the motor body includes a motor rotor assembly, and a motor rear cover assembly is detachably connected to its bottom; the motor rotor assembly contains a stator potting body and a motor stator assembly, characterized in that: The heat dissipation system includes a heat spreader, a heat pipe, and an aluminum shovel radiator. The heat spreader is in thermal contact with the coil end of the motor stator assembly, and at least one of its heat-conducting surfaces is exposed on the bottom surface of the stator potting body. The heat-absorbing end of the heat pipe is in close thermal contact with the exposed heat-conducting surface, and its heat-dissipating end is in close thermal contact with the aluminum shovel radiator.

2. The motor heat dissipation structure of the high-voltage UAV according to claim 1, characterized in that, The heat-absorbing ends of the heat spreader and heat pipe are housed within the maximum radial projection profile of the motor body.

3. The motor heat dissipation structure of the high-voltage UAV according to claim 2, characterized in that, Thermally conductive silicone grease is filled between the heat spreader and the heat-absorbing end of the heat pipe.

4. The motor heat dissipation structure of the high-voltage UAV according to claim 3, characterized in that, A heat pipe cover plate is provided between the heat pipe and the motor rear cover assembly.

5. The motor heat dissipation structure of the high-voltage UAV according to claim 4, characterized in that, The heat pipe is a vacuum tube containing a phase change working fluid.

6. The motor heat dissipation structure of the high-voltage UAV according to claim 1, characterized in that, The motor body and the aluminum shovel radiator are respectively connected to the carbon tube via locking components.

7. The motor heat dissipation structure of the high-voltage UAV according to claim 6, characterized in that, The aluminum shovel radiator is located below the motor blades.

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