Agricultural unmanned aerial vehicle

Abstract

The invention discloses an agricultural unmanned aerial vehicle. The agricultural unmanned aerial vehicle comprises a vehicle body; the vehicle arms extend out of the vehicle body; the power motor is arranged at the end part of the machine arm, an air flow channel which is through up and down is arranged in the power motor, a top cover is further mounted on the top side of the power motor, an air inlet hole is formed in the top cover, and when the agricultural unmanned aerial vehicle flies forwards, air flow can be injected into the air flow channel through the air inlet hole so as to carry away heat in the power motor; and the propeller is connected with the power motor. In the forward flying process of the agricultural unmanned aerial vehicle, forward flying countercurrent can be injected into the airflow channel of the power motor through the air inlet holes and is discharged downwards through the airflow channel, the purpose of promoting rapid dissipation of heat in the power motor is achieved, and the problem that heat dissipation of the power motor is difficult in the forward flying process is solved; and a series of problems that the performance of the power motor is influenced, the electric conversion efficiency is reduced, the service life of the power motor is shortened and the like caused by poor heat dissipation of the motor are effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to an agricultural drone. Background Art

[0002] With the continuous improvement of the performance of rotary-wing UAVs, higher requirements are put forward for the heat dissipation design of rotary-wing UAV motors. Rotary-wing UAVs mostly use brushless outer rotor motors. The main heat source is the winding copper wire and the iron core that fixes the copper wire. The main heat dissipation structure is also designed around this. The motor body used in current drones generally has a through hole inside the iron core, and a heat dissipation cover is designed on the top of the motor body, and drainage fins are provided on the inside of the heat dissipation cover. When the rotor rotates, the heat dissipation cover is driven to rotate, and the rotation of the drainage fins on the inside of the heat dissipation cover will drive the air to pass through the inside of the motor from bottom to top, thereby achieving the purpose of accelerating the heat dissipation of the motor. After research by the inventor, it was found that when the drone is hovering and not flying forward, the upward airflow can be smoothly guided out from the side of the heat dissipation cover, so there is a certain heat dissipation effect; however, when the drone flies forward, the forward counterflow will hinder the blowing of the airflow inside the motor, which will lead to the blockage of the high-temperature airflow inside the motor, and the copper wire and iron core of the motor will have the problem of cumulative temperature rise, thereby affecting the performance of the motor, and causing the disadvantages of reduced electrical conversion efficiency and reduced motor service life. Especially for agricultural UAVs, which are devices that mostly work in forward flight, the heat cannot be effectively dissipated during most of the working time, resulting in a more serious problem of poor heat dissipation. Summary of the invention

[0003] The purpose of the embodiments of the present invention is to provide an agricultural drone that can solve the above-mentioned problems existing in the prior art.

[0004] To achieve the above objectives, this application adopts the following technical solutions:

[0005] An agricultural drone is provided, comprising:

[0006] Body;

[0007] An arm extending from the body;

[0008] A power motor is arranged at the end of the arm, an air flow channel is provided inside the power motor, and a top cover is installed on the top side of the power motor. The top cover is provided with an air inlet hole. When the agricultural UAV flies forward, air can flow into the air flow channel through the air inlet hole to carry away the heat inside the power motor;

[0009] A propeller is connected to the power motor.

[0010] Optionally, the power motor includes a stator assembly, the stator assembly includes a stator core and a coil, the stator core includes a winding portion, the coil is wound around the winding portion, and the airflow channel includes a first channel formed between each of the coils.

[0011] Optionally, the top cover includes a center plate, a spoke plate and an outer ring plate, the spoke plate is connected to the periphery of the center plate, the inner side edge of the outer ring plate is connected to the spokes, and the air inlet is formed between the center plate, the spoke plate and the outer ring plate.

[0012] Optionally, the outer ring plate covers the top of the coil to protect the coil, and the air flow can be poured into the first channel through the air inlet hole on the inner side of the outer ring plate.

[0013] Optionally, the outer ring plate is spaced apart from the coil so that airflow can flow into the first channel through the air inlet hole and the gap below the outer ring plate.

[0014] Optionally, the power motor also includes a rotor assembly arranged on the outer periphery of the stator assembly, the top cover is connected to the rotor assembly, and the top cover also includes a fin arranged on the side of the outer ring plate close to the coil, and during the rotation of the top cover, the airflow between the outer ring plate and the stator assembly can be pushed into the first channel through the fin.

[0015] Optionally, the power motor also includes a rotor assembly arranged on the outer periphery of the stator assembly, and the outer edge of the outer ring plate is provided with a flange folded toward the side where the rotor assembly is located, and the flange is connected to the rotor assembly to prevent the airflow from flowing directly outward from the gap between the rotor assembly and the outer ring plate.

[0016] Optionally, the stator core includes an inner core ring and an outer core ring, the outer core ring is sleeved on the outer circumference of the inner core ring, and the first channel is arranged on the outer core ring; the airflow channel also includes a second channel, and the second channel is arranged on the inner core ring.

[0017] Optionally, the inner ring of the core includes an inner ring, an outer ring and a plurality of connecting ribs, the inner ring is located at the center of the outer ring, the connecting ribs are connected between the inner ring and the outer ring, and the second channel is formed between the inner ring, the outer ring and the connecting ribs.

[0018] Optionally, a heat sink is provided on the inner circumference of the outer ring.

[0019] Optionally, the inner ring of the core is further provided with a guide vane located in the second channel, and the guide vane guides the airflow in the second channel to blow toward the outer ring.

[0020] Optionally, the inner edge of the guide plate is connected to the inner ring, the side edge is connected to the rib plate, and the outer edge is spaced apart from the outer ring.

[0021] Optionally, at least two guide vanes are arranged in the second channel at intervals along the up and down directions, and with the central axis of the inner ring of the core as a reference, the radiation radius of the guide vane located below is greater than the radiation radius of the guide vane located above.

[0022] The beneficial effects of the present application are as follows: the present invention provides an agricultural drone, wherein the power motor is provided with an airflow channel that runs through from top to bottom, and a top cover with an air inlet is installed on the top side of the power motor. On the one hand, the top cover can provide a certain covering and protection function for the power motor; on the other hand, during the forward flight of the agricultural drone, the forward flight countercurrent can be poured into the airflow channel of the power motor through the air inlet, and discharged downward through the airflow channel, thereby achieving the purpose of promoting the rapid dissipation of heat inside the power motor. Therefore, this solution cooperates with the use scenario of the agricultural drone, introduces the forward flight countercurrent during the flight of the agricultural drone into the motor to promote heat dissipation, solves the problem of difficult heat dissipation of the motor during the forward flight, and effectively overcomes a series of problems caused by poor heat dissipation of the motor, such as affecting motor performance, reducing electrical conversion efficiency, and reducing motor service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present application is further described in detail below based on the drawings and embodiments.

[0024] Figure 1 It is a structural schematic diagram of an existing motor;

[0025] Figure 2 It is a schematic diagram of the air flow direction when the existing motor flies forward;

[0026] Figure 3 This is a schematic diagram of the structure of the power motor described in the embodiment of the present application;

[0027] Figure 4 A top view of the power motor described in an embodiment of the present application;

[0028] Figure 5 This is an exploded schematic diagram of the power motor described in the embodiment of the present application;

[0029] Figure 6 A cross-sectional view of the power motor described in an embodiment of the present application;

[0030] Figure 7 This is a schematic diagram of the inner structure of the top cover described in the embodiment of the present application;

[0031] Figure 8 This is one of the structural schematic diagrams of the inner ring of the core described in the embodiment of the present application;

[0032] Fig. 9 This is the second structural schematic diagram of the inner ring of the core according to the embodiment of the present application;

[0033] Fig.10 A cross-sectional view of the inner ring of the core described in the embodiment of the present application;

[0034] Fig.11 This is a schematic diagram of the air flow direction when the power motor described in an embodiment of the present application is flying forward.

[0035] In the figure:

[0036] 01. Motor body; 02. Heat dissipation cover;

[0037] 1. Stator assembly; 11. Stator core; 111. Core inner ring; 1111. Inner ring; 1112. Rib plate; 1113. Outer ring; 1114. Heat sink; 1115. Guide vane; 112. Core outer ring; 1121. Winding part; 2. Rotor assembly; 3. Top cover; 31. Air inlet; 32. Center plate; 33. Spoke plate; 34. Outer ring plate; 35. Fin; 36. Flanging; 4. Air flow channel; 41. First channel; 42. Second channel. DETAILED DESCRIPTION

[0038] In order to make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved more clearly, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0039] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] Rotor drones mostly use brushless outer rotor motors. The main heat source is the winding copper wire and the iron core that fixes the copper wire. The main heat dissipation structure is also designed around this. Figure 1 As shown, the motor body 01 currently used in drones generally has a through hole inside the iron core, and a heat sink cover 02 is designed on the top of the motor body 01, and drainage fins are provided on the inner side of the heat sink cover 02. When the rotor rotates, it drives the heat sink cover 02 to rotate, and the rotation of the drainage fins on the inner side of the heat sink cover 02 drives the air to pass through the inside of the motor from bottom to top, thereby achieving the purpose of accelerating the heat dissipation of the motor. The inventors have found through research that when the drone is in a hovering state without flying forward, the active airflow directed upward can be smoothly guided out from the side of the heat sink cover 02, so there is a certain heat dissipation effect; however, if Figure 2 As shown in the figure, when the drone flies forward, the reverse flow of the forward flight will hinder the blowing of the active airflow inside the motor, which will lead to the blockage of the high-temperature airflow inside the motor, and the problem of cumulative temperature rise of the motor copper wire and iron core, which will affect the motor performance, and cause the disadvantages of reduced power conversion efficiency and reduced motor service life. In particular, agricultural drones are a device that mostly works in forward flight. The heat of most of its working time cannot be effectively dissipated, and there is a more serious problem of poor heat dissipation.

[0042] In order to overcome the above technical problems, Figure 3-Figure 11 As shown, this embodiment provides an agricultural UAV, which can introduce the forward flight countercurrent during the forward flight of the UAV into the interior of the power motor to dissipate the heat of the motor, so as to overcome the problem of poor heat dissipation of traditional motors.

[0043] The agricultural drone of this embodiment includes a body, an arm, a power motor and a propeller. The arm extends from the body, the power motor is installed at the end of the arm, and the propeller is connected to the power motor. The power motor drives the propeller to rotate to provide lift, thereby achieving the purpose of driving the agricultural drone to fly.

[0044] In the specific scheme, an air flow channel 4 running through from top to bottom is provided inside the power motor, and a top cover 3 is also installed on the top side of the power motor. The top cover 3 is provided with an air inlet 31. When the agricultural UAV flies forward, the air flow can be poured into the air flow channel 4 through the air inlet 31 to carry away the heat inside the power motor.

[0045] Based on the structure of the motor of this embodiment, on the one hand, the top cover 3 can provide a certain covering and protection function for the power motor; on the other hand, during the forward flight of the agricultural drone, the forward flight countercurrent can be poured into the air flow channel 4 of the power motor through the air inlet 31, and discharged downward through the air flow channel 4, so as to achieve the purpose of promoting the rapid dissipation of heat inside the power motor. Therefore, this solution cooperates with the use scenario of the agricultural drone, introduces the forward flight countercurrent during the flight of the agricultural drone into the power motor to promote heat dissipation, solves the problem of heat dissipation difficulty of the power motor during the forward flight, and effectively overcomes a series of problems caused by poor heat dissipation of the power motor, such as affecting the performance of the power motor, reducing the electric conversion efficiency, and reducing the service life of the power motor.

[0046] It should be emphasized that the power motor of this embodiment is particularly suitable for the application scenarios of agricultural drones. Traditional drones for filming generally need to hover in the air for a long time for filming, but agricultural drones are different. Agricultural drones are generally used to complete tasks such as spraying liquid medicine, sowing seeds and fertilizers, lifting goods, throwing rice seedlings, and patrolling. Therefore, agricultural drones rarely hover during actual work, and most of the time they are in forward flight. The power motor of this solution just uses the countercurrent air during the forward flight of the agricultural drone to dissipate the heat of the power motor, so it can ensure that the power motor is in an effective heat dissipation scenario most of the time.

[0047] In one embodiment, the power motor includes a stator assembly 1, the stator assembly 1 includes a stator core 11 and a coil, the stator core 11 includes a winding portion 1121, the coil is wound around the winding portion 1121, and the airflow channel 4 includes a first channel 41, and the first channel 41 is formed between each of the coils.

[0048] The stator core 11 is the skeleton of the stator assembly 1, and is usually formed by laminating multiple layers of thin iron sheets to reduce eddy current loss and iron loss. The stator core 11 is provided with a winding portion 1121 for carrying current and generating a magnetic field. The coil is a key part of the stator assembly 1, which is wound on the winding portion 1121. The current passing through the coil interacts with the magnetic field generated by the rotor, thereby generating an electromagnetic torque to drive the stator to rotate.

[0049] In the power motor, the coil and the winding part 1121 are the main heat-generating parts. In this embodiment, a first channel 41 is arranged between the coils. The first channel 41 allows external air to enter the motor more easily and directly contact the main heat-generating components such as the coil and the winding part 1121, and take away the heat from these components, thereby achieving more effective heat dissipation.

[0050] In one embodiment, the top cover 3 includes a center plate 32, a spoke plate 33 and an outer ring plate 34, the spoke plate 33 is connected to the periphery of the center plate 32, the inner side edge of the outer ring plate 34 is connected to the spokes, and the air inlet 31 is formed between the center plate 32, the spoke plate 33 and the outer ring plate 34.

[0051] The center plate 32 is located at the center of the top cover 3, and the spoke plate 33 is connected to the periphery of the center plate 32, playing the role of supporting and connecting the center plate 32 and the outer ring plate 34. The spoke plate 33 can be designed in different shapes and quantities to optimize air flow and enhance the structural strength of the top cover 3. The outer ring plate 34 is located at the outermost layer of the top cover 3, and its inner side is connected to the spoke plate 33. Through the combined design of the center plate 32, the spoke plate 33 and the outer ring plate 34, the shape and size of the air inlet 31 are optimized, which helps to more effectively guide the countercurrent air when the agricultural drone flies forward into the power motor and improve the heat dissipation efficiency. The design of the spoke plate 33 not only helps to optimize air flow, but also enhances the structural strength of the top cover 3, which enables the top cover 3 to better withstand the vibration and impact during the flight of the agricultural drone, and improves the reliability and durability of the power motor.

[0052] Optionally, the entire top cover 3 is an integrated structure, which can be integrally stamped, integrally die-cast or integrally injection molded.

[0053] In one embodiment, the outer ring plate 34 covers the coil to protect the coil, and the airflow can flow into the first channel 41 through the air inlet hole 31 on the inner side of the outer ring plate 34 .

[0054] The coil is a relatively fragile part of the stator assembly 1, and the outer ring plate 34 covering the top of the coil can provide effective protection for it. Therefore, this embodiment successfully achieves effective protection of the coil by making the outer ring plate 34 cover the top of the coil. At the same time, the area outside the coil, that is, the inner side of the outer ring plate 34 is hollowed out to form the air inlet 31, so that the airflow can be smoothly poured into the first channel 41 through the air inlet 31 during the forward flight process, so as to effectively dissipate the heat of the coil.

[0055] In one embodiment, the outer ring plate 34 is spaced apart from the coil, so that airflow can flow into the first channel 41 through the air inlet hole 31 and the gap below the outer ring plate 34 .

[0056] A sufficient gap is kept between the outer ring plate 34 and the coil to ensure that air can smoothly pass through the air inlet 31 and the gap below the outer ring plate 34 into the first channel 41 inside the motor for heat dissipation. This design not only improves the performance and stability of the motor, but also enhances its ability to adapt to different working environments.

[0057] In one embodiment, in combination Figure 7 The structure shown and Fig.11 As shown in the airflow effect, the power motor also includes a rotor assembly 2 arranged on the outer periphery of the stator assembly 1, the top cover 3 is connected to the rotor assembly 2, and the top cover 3 also includes a fin 35 arranged on the side of the outer ring plate 34 close to the coil. During the rotation of the top cover 3, the airflow between the outer ring plate 34 and the stator assembly 1 can be pushed into the first channel 41 through the fin 35.

[0058] The inventor found that during the forward flight of the agricultural drone, the motor maintains a certain tilt angle, and the forward flight countercurrent will be poured into the space between the top cover 3 and the stator assembly 1 horizontally through the air inlet 31, which cannot ensure that this part of the airflow effectively contacts the coil and is discharged. Therefore, the top cover 3 of this embodiment is designed to be fixed on the stator core 11. This fixing method ensures that the top cover 3 can be driven to rotate synchronously during the rotation of the stator assembly 1. At the same time, a fin 35 is added to the side of the outer ring plate 34 close to the coil. The main function of the fin 35 is to promote the airflow between the outer ring plate 34 and the stator assembly 1 during the rotation of the top cover 3, so that this part of the airflow can change direction and blow downward toward the coil and the first channel 41, ensuring that enough air passes through the first channel 41 to achieve effective heat dissipation of the coil.

[0059] Therefore, the design of the top cover 3 of this embodiment further improves the heat dissipation efficiency of the power motor by adding fins 35. In addition, the design of the fins 35 also enhances the structural strength of the top cover 3, so that it can better cope with various working environments.

[0060] In one embodiment, the power motor also includes a rotor assembly 2 arranged on the outer periphery of the stator assembly 1, and the outer edge of the outer ring plate 34 is provided with a flange 36 folded toward the side where the rotor assembly 2 is located, and the flange 36 is connected to the rotor assembly 2 to prevent the airflow from flowing directly outward from the gap between the rotor assembly 2 and the outer ring plate 34.

[0061] The inventors found that in order to ensure that there is sufficient air intake and sufficient space to set the fins 35, a sufficiently large gap should be maintained between the outer ring plate 34 and the stator assembly 1. This results in the forward flying countercurrent entering the space below the outer ring plate 34 laterally and being easily blown out directly through the opening between the outer ring plate 34 and the rotor assembly 2, reducing the amount of air passing downward through the first channel 41 and affecting the heat dissipation effect.

[0062] Therefore, in this embodiment, a flange 36 is provided on the outer side of the outer ring plate 34, which is folded toward the side where the rotor assembly 2 is located, and the flange 36 is connected to the rotor assembly 2, so that the rotor assembly 2 drives the top cover 3 to rotate. The flange 36 can also effectively block most of the airflow from flowing out directly from the gap between the rotor assembly 2 and the outer ring plate 34. Fig.11 As shown in the effect, when the airflow contacts the flange 36, they will be blocked and deflected back, and at the same time, driven by the fins 35, they will pass downward through the coil and the first channel 41, which not only increases the airflow through the heat dissipation channel, but also improves the heat dissipation efficiency.

[0063] In one embodiment, referring to Figure 6 The stator core 11 includes an inner core ring 111 and an outer core ring 112, the outer core ring 112 is sleeved on the outer periphery of the inner core ring 111, and the first channel 41 is arranged on the outer core ring 112; the airflow channel 4 also includes a second channel 42, and the second channel 42 is arranged on the inner core ring 111.

[0064] A second channel 42 is provided in the core inner ring 111 . The introduction of the second channel 42 not only reduces the weight of the core inner ring 111 , but more importantly, enables airflow to pass through the second channel 42 and take away the heat of the core inner ring 111 , thereby improving the heat dissipation efficiency of the entire stator core 11 .

[0065] In one embodiment, referring to Figure 8-Figure 9 The core inner ring 111 includes an inner ring 1111, an outer ring 1113 and a plurality of connecting ribs 1112. The inner ring 1111 is located at the center of the outer ring 1113. The connecting ribs 1112 are connected between the inner ring 1111 and the outer ring 1113. The second channel 42 is formed between the inner ring 1111, the outer ring 1113 and the connecting ribs 1112.

[0066] The inner ring 1111 is located at the center of the inner ring 111 of the core, and is usually a smaller ring structure; the outer ring 1113 surrounds the outer circumference of the inner ring 1111, and keeps a certain distance from the inner ring 1111; the connecting ribs 1112 are key components connecting the inner ring 1111 and the outer ring 1113, and are usually distributed in a radial or mesh shape, firmly connecting the inner ring 1111 and the outer ring 1113. This structure has the advantages of good stability and strong reliability.

[0067] In one embodiment, a heat sink 1114 is disposed on the inner circumference of the outer ring 1113 .

[0068] On the inner circumference of the outer ring 1113, that is, on the side in contact with the outer ring 112 of the core, heat sinks 1114 are provided. These heat sinks 1114 may be fin-shaped, rib-shaped or in other shapes, in order to increase the heat dissipation area and improve the heat dissipation efficiency. Since the winding portion 1121 is provided on the outer ring 112 of the core, the outer ring 112 of the core becomes the main heat generating component, and the outer side of the outer ring 1113 is in close contact with the outer ring 112 of the core, the heat of the outer ring 112 of the core is easily directly transferred to the outer ring 1113. By providing the heat sink 1114 on the inner circumference of the outer ring 1113, the heat dissipation area of ​​the outer ring 1113 can be significantly increased, so that the heat can be dissipated to the surrounding environment more quickly. At the same time, the heat sink 1114 is located exactly in the second channel 42, which enables the airflow to fully contact the heat sink 1114 when passing through the second channel 42, thereby achieving more effective heat dissipation.

[0069] In one embodiment, in combination Figure 10-11 The core inner ring 111 is further provided with a guide vane 1115 located in the second channel 42 , and the guide vane 1115 guides the airflow in the second channel 42 to blow toward the outer ring 1113 .

[0070] The guide vane 1115 is a thin sheet or plate-like structure disposed in the second channel 42, and its function is to guide the airflow to flow in a specific direction. In this embodiment, the guide vane 1115 is designed to guide the airflow in the second channel 42 to blow toward the outer ring 1113, so that the airflow entering the second channel 42 can make more sufficient contact with the outer ring 1113, thereby carrying away more heat and improving the heat dissipation efficiency. In addition, the guide vane 1115 can also reduce the turbulence and eddy current of the airflow in the second channel 42, reduce energy loss, and improve the overall heat dissipation performance.

[0071] In one embodiment, the inner edge of the guide plate 1115 is connected to the inner ring 1111 , the side edge is connected to the rib plate 1112 , and the outer edge is spaced apart from the outer ring 1113 .

[0072] The inner edge of the guide vane 1115 is connected to the inner ring 1111, and the side edge is connected to the connecting rib plate 1112, which provides additional support for the guide vane 1115 and ensures the stability of the guide vane 1115. At the same time, this connection method also helps to maintain the continuity of the guide vane 1115 in the airflow direction.

[0073] The outer edge of the guide plate 1115 maintains a certain distance from the outer ring 1113, so that after the airflow blows toward the outer ring 1113 and forms contact, it can be blown downward through the distance between the guide plate 1115 and the outer ring 1113, forming a continuous and stable airflow path.

[0074] In one embodiment, referring to Fig.10 At least two guide vanes 1115 are arranged in the second channel 42 at intervals along the up and down directions, and with the central axis of the core inner ring 111 as a reference, the radiation radius of the guide vane 1115 located at the bottom is greater than the radiation radius of the guide vane 1115 located at the top.

[0075] At least two guide vanes 1115 are arranged in the second channel 42 in an interval along the vertical direction, so that the airflow can be guided by the multiple guide vanes to blow toward the outer ring 1113 when the airflow passes through the second channel 42 from top to bottom, so that the air can be more fully in contact with the outer ring 1113. In addition, the radiation radius component of the guide vane 1115 increases from top to bottom, so that each guide vane 1115 can effectively play its guiding role.

[0076] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., and other directions or positional relationships are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of this application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0077] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0078] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0079] The technical principles of the present application are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present application and cannot be interpreted as limiting the scope of protection of the present application in any way. Based on the explanations herein, those skilled in the art can think of other specific implementation methods of the present application without creative work, and these methods will fall within the scope of protection of the present application.

Claims

1. An agricultural drone, characterized in that: include: Body; An arm extending from the body; A power motor is arranged at the end of the arm, an air flow channel (4) is provided inside the power motor and is connected vertically. A top cover (3) is also installed on the top side of the power motor, and the top cover (3) is provided with an air inlet (31). When the agricultural UAV flies forward, air can flow into the air flow channel (4) through the air inlet (31) to carry away the heat inside the power motor. A propeller is connected to the power motor.

2. The agricultural drone according to claim 1, characterized in that: The power motor comprises a stator assembly (1), the stator assembly (1) comprises a stator core (11) and a coil, the stator core (11) comprises a winding portion (1121), the coil is wound around the winding portion (1121), and the airflow channel (4) comprises a first channel (41), the first channel (41) is formed between the coils.

3. The agricultural drone according to claim 2, characterized in that: The top cover (3) comprises a center plate (32), a spoke plate (33) and an outer ring plate (34); the spoke plate (33) is connected to the periphery of the center plate (32); the inner side edge of the outer ring plate (34) is connected to the spokes; and the air inlet (31) is formed between the center plate (32), the spoke plate (33) and the outer ring plate (34).

4. The agricultural drone according to claim 3, characterized in that: The outer ring plate (34) covers the top of the coil to protect the coil, and the airflow can be poured into the first channel (41) through the air inlet hole (31) on the inner side of the outer ring plate (34).

5. The agricultural drone according to claim 4, characterized in that: The outer ring plate (34) is spaced apart from the coil so that airflow can flow into the first channel (41) through the air inlet hole (31) and the gap below the outer ring plate (34).

6. The agricultural drone according to claim 4, characterized in that: The power motor also includes a rotor assembly (2) arranged on the outer periphery of the stator assembly (1), the top cover (3) is connected to the rotor assembly (2), and the top cover (3) also includes a fin (35) arranged on a side of the outer ring plate (34) close to the coil. During the rotation of the top cover (3), the fin (35) can push the airflow between the outer ring plate (34) and the stator assembly (1) into the first channel (41).

7. The agricultural drone according to claim 4, characterized in that: The power motor also includes a rotor assembly (2) arranged on the outer periphery of the stator assembly (1), and the outer side edge of the outer ring plate (34) is provided with a flange (36) folded toward the side where the rotor assembly (2) is located, and the flange (36) is connected to the rotor assembly (2) to prevent airflow from directly flowing out from the gap between the rotor assembly (2) and the outer ring plate (34).

8. The agricultural drone according to claim 2, characterized in that: The stator core (11) comprises an inner core ring (111) and an outer core ring (112), wherein the outer core ring (112) is sleeved on the outer circumference of the inner core ring (111), and the first channel (41) is arranged on the outer core ring (112); the air flow channel (4) further comprises a second channel (42), and the second channel (42) is arranged on the inner core ring (111).

9. The agricultural drone according to claim 8, characterized in that: The core inner ring (111) comprises an inner ring (1111), an outer ring (1113) and a plurality of connecting ribs (1112); the inner ring (1111) is located at the center of the outer ring (1113); the connecting ribs (1112) are connected between the inner ring (1111) and the outer ring (1113); and the second channel (42) is formed between the inner ring (1111), the outer ring (1113) and the connecting ribs (1112).

10. The agricultural drone according to claim 9, characterized in that: A heat sink (1114) is provided on the inner circumference of the outer ring (1113).

11. The agricultural drone according to claim 9, characterized in that: The core inner ring (111) is further provided with a guide vane (1115) located in the second channel (42), and the guide vane (1115) guides the airflow in the second channel (42) to blow toward the outer ring (1113).

12. The agricultural drone according to claim 11, characterized in that: The inner edge of the guide plate (1115) is connected to the inner ring (1111), the side edge is connected to the rib plate (1112), and the outer edge is spaced apart from the outer ring (1113).

13. The agricultural drone according to claim 12, characterized in that: At least two guide vanes (1115) are arranged in the second channel (42) at intervals in the up-down direction, and with the central axis of the core inner ring (111) as a reference, the radiation radius of the guide vane (1115) located at the bottom is greater than the radiation radius of the guide vane (1115) located at the top.

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