Plant protection unmanned aerial vehicle power motor and plant protection unmanned aerial vehicle

Abstract

The application discloses a plant protection unmanned aerial vehicle power motor and a plant protection unmanned aerial vehicle. The plant protection unmanned aerial vehicle power motor comprises a stator assembly and a rotor assembly. The rotor assembly comprises a rotor shell, a magnetic isolation piece and a plurality of permanent magnets. The rotor shell is rotationally matched with the stator assembly and is at least partially sleeved on the outer periphery of the stator assembly. The magnetic isolation piece is installed on the rotor shell. The plurality of permanent magnets are arranged on the inner periphery side of the rotor shell in the circumferential direction and are spaced from each other by the magnetic isolation piece. According to the plant protection unmanned aerial vehicle power motor, the magnetic isolation piece can be separately manufactured, and compared with related technologies, the magnetic isolation piece no longer needs to be stretched from a profile and then be milled on a thin stretched structure, thereby reducing the manufacturing difficulty of the magnetic isolation piece, ensuring better machining precision of the magnetic isolation piece, and thereby facilitating the manufacturing precision of the rotor assembly.

Description

Technical Field

[0001] This application relates to the field of rotary drive components, and in particular to a power motor for an agricultural drone and an agricultural drone. Background Technology

[0002] The power motor used to drive the propeller assembly on agricultural drones is primarily an external rotor motor. The external rotor motor includes a stator assembly and a rotor assembly fitted around the outer periphery of the stator assembly. In related technologies, the rotor assembly includes a separate cover, a metal ring, and multiple permanent magnets. The metal ring and cover are interconnected, and the metal ring surrounds the outer periphery of the stator assembly. The multiple permanent magnets are mounted on the metal ring. The cover is placed on the stator assembly, and spacer teeth are formed on the cover as magnetic separators to separate the permanent magnets. Due to the lightweight requirements of agricultural drones, the cover needs to be stretched first during the manufacturing process of the magnetic separators, and then milled to form the magnetic separators. However, due to the structural strength limitations of the stretched cover, it is difficult to guarantee the machining accuracy of the spacer teeth during the processing. Utility Model Content

[0003] This application provides a power motor for an agricultural drone and an agricultural drone, which can reduce the manufacturing difficulty of the magnetic shielding component and facilitate the improvement of the manufacturing precision of the rotor assembly.

[0004] In a first aspect, embodiments of this application provide a power motor for an agricultural drone, comprising: a stator assembly; and a rotor assembly. The rotor assembly includes a separately disposed rotor housing, a magnetic shielding component, and a plurality of permanent magnets. The rotor housing is rotatably fitted with the stator assembly. The rotor housing is at least partially sleeved on the outer periphery of the stator assembly. The magnetic shielding component is installed on the rotor housing. The plurality of permanent magnets are arranged circumferentially on the inner periphery of the rotor housing and are spaced apart from each other by the magnetic shielding component.

[0005] According to the foregoing embodiments of the first aspect of this application, the rotor housing includes an integrally formed surrounding portion and a cover portion, the surrounding portion surrounding the outer periphery of the stator assembly, the cover portion being located at one end of the surrounding portion in the axial direction, and the cover portion covering one end face of the stator assembly in the circumferential direction.

[0006] According to any of the foregoing embodiments of the first aspect of this application, the cover portion has a hollow structure.

[0007] According to any of the foregoing embodiments of the first aspect of this application, the magnetic shielding element is embedded in the inner peripheral side of the surrounding portion.

[0008] According to any of the foregoing embodiments of the first aspect of this application, the magnetic shielding member includes a support ring and a plurality of spacer teeth, the plurality of spacer teeth extending outward from one side end face of the support ring along the axial direction, and the plurality of spacer teeth being arranged in a circumferentially spaced manner.

[0009] According to any of the foregoing embodiments of the first aspect of this application, the magnetic shielding component is an injection molded component and is fixedly connected to the rotor housing and the plurality of permanent magnet components by a cured structural adhesive.

[0010] According to any of the foregoing embodiments of the first aspect of this application, the stator assembly includes a stator base and a stator core mounted on the stator base, the rotor assembly further includes a rotating shaft, the rotating shaft is connected to the rotor housing, the rotating shaft passes through the stator base and rotatably engages with the stator base, and the plant protection drone power motor further includes a propeller mounting base, the propeller mounting base is fixedly connected to the rotating shaft, and the propeller mounting base is used to connect the propeller assembly.

[0011] According to any of the foregoing embodiments of the first aspect of this application, the rotating shaft includes an insertion portion and a mounting portion. The insertion portion is used to pass through the stator seat, and the mounting portion is located at one end of the insertion portion along the axial direction. The mounting portion is exposed outside the rotor housing, and the mounting portion is provided with a first connection hole for connecting with the propeller mounting base.

[0012] According to any of the foregoing embodiments of the first aspect of this application, the power motor of the agricultural drone further includes: a bearing disposed between the extension portion and the stator seat, wherein the extension portion is provided with an abutment portion, and the abutment portion abuts against the end face of one end of the bearing along the axial direction.

[0013] Secondly, embodiments of this application provide an agricultural drone, which includes: an agricultural drone power motor according to any of the foregoing embodiments of the first aspect of this application, and a propeller assembly connected to the rotor assembly of the agricultural drone power motor.

[0014] According to an embodiment of this application, the rotor assembly of the agricultural drone power motor includes a rotor shell, a magnetic shielding component, and multiple permanent magnets. The magnetic shielding component is separately disposed from the rotor shell and is installed on the rotor shell. Since the magnetic shielding component and the rotor shell are separate components, the magnetic shielding component can be manufactured separately during the manufacturing process of the rotor assembly. Compared with related technologies, the magnetic shielding component no longer needs to be obtained by first stretching the cover into a profile and then milling it on a thin stretched structure, thereby reducing the manufacturing difficulty of the magnetic shielding component, ensuring that the magnetic shielding component has better processing accuracy, and thus facilitating the improvement of the manufacturing accuracy of the rotor assembly. Attached Figure Description

[0015] 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 the structures shown in these drawings without creative effort.

[0016] Figure 1 This is a top view schematic diagram of an embodiment of the power motor for an agricultural drone according to this application;

[0017] Figure 2 This is a cross-sectional schematic diagram of an embodiment of the power motor for an agricultural drone according to this application;

[0018] Figure 3 This is a three-dimensional exploded view of the rotor assembly in one embodiment of the power motor for an agricultural drone according to this application.

[0019] Explanation of reference numerals in the attached figures:

[0020] 1000-Power motor for agricultural drones;

[0021] 100 - Stator assembly; 110 - Stator base; 120 - Stator core;

[0022] 200 - Rotor assembly; 210 - Rotor housing; 211 - Surrounding part; 212 - Cover part; 212a - Hollowed-out structure; 220 - Magnetic shielding component; 221 - Support ring; 222 - Spacer teeth; 230 - Permanent magnet component; 240 - Shaft component; 241 - Extension part; 241a - Abutting part; 242 - Mounting part; 242a - First connecting hole;

[0023] 300-Bearing;

[0024] 400-Heat Dissipation Cover.

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that all directional indications in the embodiments of this application, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0028] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0029] The power motor of agricultural drones is mainly an external rotor motor, which includes a stator assembly and a rotor assembly fitted around the outer periphery of the stator assembly. In related technologies, the rotor assembly includes a separate cover, a metal ring, and multiple permanent magnets. The metal ring and cover are interconnected, and the metal ring surrounds the outer periphery of the stator assembly. The multiple permanent magnets are mounted on the metal ring. The cover is placed on the stator assembly, and spacer teeth are formed on the cover as magnetic separators to separate the permanent magnets. Due to the lightweight requirements of agricultural drones, the cover needs to be stretched first, and then milled to form the magnetic separator. However, due to the structural strength limitations after stretching, it is difficult to guarantee the machining accuracy of the spacer teeth during the spacer tooth formation process, and the spacer teeth are prone to deformation or breakage, which is detrimental to the consistency requirements of production. In related technologies, the above-mentioned magnetic separator manufacturing scheme, which involves stretching the cover first and then milling to form the magnetic separator, has a large machining volume.

[0030] In addition, in related technologies, the metal ring and the cover are set separately. When the rotor assembly is assembled, the metal ring and the cover are connected by interference fit and structural adhesive to meet the torque transmission requirements, and are connected by screws, which makes the assembly process more complicated.

[0031] This application provides a power motor for an agricultural drone, which is used to drive the propeller assembly to rotate and can be applied to agricultural drones. Figure 1 , Figure 2 These are a top view and a cross-sectional view of an embodiment of the power motor for an agricultural drone according to this application. The power motor 1000 for the agricultural drone includes a stator assembly 100 and a rotor assembly 200. The rotor assembly 200 is at least partially sleeved on the outer periphery of the stator assembly 100.

[0032] Figure 3 This is an exploded perspective view of the rotor assembly in one embodiment of the power motor for an agricultural drone according to this application. The rotor assembly 200 includes a separately configured rotor housing 210, a magnetic shielding component 220, and a plurality of permanent magnet components 230. The magnetic shielding component 220 is separately configured from the rotor housing 210. The rotor housing 210 is rotatably fitted with the stator assembly 100, and the rotor housing 210 is at least partially fitted onto the outer periphery of the stator assembly 100. The magnetic shielding component 220 is mounted on the rotor housing 210. The plurality of permanent magnet components are arranged circumferentially on the inner periphery of the rotor housing 210 and spaced apart from each other by the magnetic shielding component 220. The rotor housing 210 may be a metal component. The permanent magnet components 230 are, for example, magnets.

[0033] According to the embodiments of this application, the power motor 1000 for agricultural drones includes a rotor assembly 200 comprising a rotor housing 210, a magnetic shielding component 220, and multiple permanent magnets 230. The magnetic shielding component 220 is separately disposed from the rotor housing 210 and is mounted on the rotor housing 210. Since the magnetic shielding component 220 and the rotor housing 210 are separate components, the magnetic shielding component 220 can be manufactured separately during the manufacturing process of the rotor assembly 200. Compared with related technologies, the magnetic shielding component no longer needs to be obtained by first stretching the cover profile and then milling it on the thin stretched structure, thereby reducing the manufacturing difficulty of the magnetic shielding component 220 and ensuring that the magnetic shielding component 220 has better processing accuracy, thus facilitating the improvement of the manufacturing accuracy of the rotor assembly 200.

[0034] like Figure 3 In some embodiments, the rotor housing 210 includes an integrally formed circumferential portion 211 and a cover portion 212. The circumferential portion 211 surrounds the outer periphery of the stator assembly 100, and the cover portion 212 is located at one end of the axial direction of the circumferential portion 211 and covers one end face of the stator assembly 100 in the circumferential direction.

[0035] In one example, the surrounding portion 211 and the cover portion 212 of the rotor housing 210 are formed by an integral stamping and stretching process. For example, cold-rolled steel strip is used and subjected to stamping and stretching to obtain a rotor housing 210 in which the surrounding portion 211 and the cover portion 212 are integrally formed. The manufacturing process of the rotor housing 210 is simple and the structural assembly accuracy is high. It provides a more convenient forming process while ensuring that the thickness of the rotor housing 210 is still relatively thin, and it is also convenient to improve the electromagnetic performance and working efficiency of the power motor 1000 of the agricultural drone.

[0036] In this embodiment, the rotor housing 210 includes an integrally formed surrounding portion 211 and a cover portion 212. Compared to the rotor housing 210, which has a separate structure for the surrounding portion 211 and the cover portion 212, it is no longer necessary to make the surrounding portion 211 and the cover portion 212 interference fit and bond them with structural adhesive. The connecting piece used to connect the surrounding portion 211 and the cover portion 212 can also be eliminated, which can improve the quality stability of the rotor housing 210, reduce the assembly and production process of the plant protection drone power motor 1000, and improve the structural strength and reliability of the rotor assembly 200 of the plant protection drone power motor 1000.

[0037] like Figure 3 In some embodiments, the cover portion 212 has a hollow structure 212a. In one example, the cover portion 212 includes a central portion located at the center of rotation and a plurality of support portions connecting the outer periphery of the central portion and the surrounding portion 211. The plurality of support portions are radially distributed, and a hollow structure 212a is formed between adjacent support portions. In the above embodiments, the cover portion 212 has a hollow structure 212a, which further reduces the weight of the rotor housing 210.

[0038] like Figure 2 In some embodiments, the magnetic shielding member 220 is embedded in the inner circumferential side of the surrounding portion 211, so that the magnetic shielding member 220 is tightly connected with the rotor housing 210, thereby improving the stability of the connection between the magnetic shielding member 220 and the rotor housing 210.

[0039] like Figure 3 In some embodiments, the magnetic shielding element 220 includes a support ring 221 and a plurality of spacer teeth 222, which extend outward from one axial end face of the support ring 221 and are arranged in a circumferentially spaced manner. The support ring 221 provides support and integration for the plurality of spacer teeth 222, and the magnetic shielding element 220 including the support ring 221 and the plurality of spacer teeth 222 is also easier to manufacture.

[0040] In some embodiments, the magnetic shielding component 220 is an injection-molded part and is fixedly connected to the rotor housing 210 and multiple permanent magnets 230 by cured structural adhesive. Because the magnetic shielding component 220 is an injection-molded part, it is lighter and easier to manufacture, thereby further facilitating the optimization of the weight of the agricultural drone's power motor 1000. Compared with related technologies, the injection-molded magnetic shielding component 220 ensures both higher structural precision and structural strength of the spacer teeth 222, reducing the possibility of deformation and breakage of the spacer teeth 222, and facilitating the meeting of consistency requirements in production and processing.

[0041] In one example, when assembling the rotor housing 210, the magnetic shielding component 220 is embedded in the rotor housing 210, and then multiple permanent magnets are pushed into the adjacent spacer teeth 222 of the magnetic shielding component 220. Then, structural adhesive is applied and cured between the rotor housing 210, the magnetic shielding component 220, and the permanent magnets 230, so that the magnetic shielding component 220, the rotor housing 210, and the multiple permanent magnets 230 are fixedly connected.

[0042] like Figure 2 In some embodiments, the stator assembly 100 includes a stator base 110 and a stator core 120 mounted on the stator base 110, and the rotor assembly 200 further includes a rotating shaft 240 connected to the rotor housing 210. The rotating shaft 240 passes through the stator base 110 and rotates in cooperation with the stator base 110.

[0043] In some embodiments, the plant protection drone power motor 1000 also includes a propeller mount (not shown in the figure), which is fixedly connected to the shaft 240 and is used to connect the propeller assembly.

[0044] In related technologies, the rotor housing 210 is a thin metal part. When the propeller mounting base is installed on the rotor housing 210, it is prone to wear and deformation under long-term rotation, which affects the balance of the high-speed operation of the agricultural drone's power motor 1000. In the above embodiment, the propeller mounting base is fixedly connected to the shaft component 240. Compared with the scheme where the propeller mounting base is installed on the rotor housing 210, the shaft component 240 has higher structural strength than the thin rotor housing 210, which can improve the installation accuracy, installation stability and connection strength of the propeller mounting base. This further facilitates the improvement of the installation accuracy and connection strength between the propeller assembly and the agricultural drone's power motor 1000, ensuring the reliability of the agricultural drone's power motor 1000 operation.

[0045] like Figure 2 , Figure 3 In some embodiments, the shaft member 240 includes an extension portion 241 and a mounting portion 242. The extension portion 241 is for passing through the stator base 110, and the mounting portion 242 is located at one axial end of the extension portion 241. The mounting portion 242 is exposed outside the rotor housing 210, and the mounting portion 242 is provided with a first connection hole 242a for connecting with a propeller mounting base.

[0046] In some embodiments, the mounting portion 242 is disc-shaped and exposed outside the rotor housing 210, thereby providing stable support for the propeller mount and propeller assembly. The mounting portion 242 is provided with a first connection hole 242a for connecting with the propeller mount. The propeller mount can be connected to the first connection hole 242a through a detachable connector, thereby facilitating the connection between the propeller mount and the rotor assembly 200.

[0047] like Figure 2 In some embodiments, the plant protection drone power motor 1000 further includes a bearing 300 disposed between the extension portion 241 and the stator seat 110. In some embodiments, the extension portion 241 is provided with an abutment portion 241a, which abuts against the end face of one end of the bearing 300 along the axial direction.

[0048] In one example, the abutment portion 241a is, for example, a boss structure provided on the outer periphery of the extension portion 241. In the above embodiment, the assembly limiting structure between the rotor assembly 200 and the stator seat 110 is achieved by the abutment portion 241a of the rotating shaft 240 and the bearing 300, which improves the reliability of the rotational movement of the plant protection drone's power motor 1000 and improves the convenience of assembly.

[0049] In some embodiments, the agricultural drone power motor 1000 also includes other auxiliary functional components, such as a heat dissipation cover 400 that covers the cover portion 212 of the rotor housing 210. In other embodiments, the agricultural drone power motor 1000 may also include other components such as a ground pad, a retaining ring, and an anti-loosening cover.

[0050] The power motor 1000 for the agricultural drone in the above embodiments of this application is assembled, for example, through the following process.

[0051] The bearing 300 is installed on the stator housing 110 of the stator assembly 100. In some embodiments, the stator housing 110 has a bearing mounting groove, and the bearing 300 is installed in the bearing mounting groove. The magnetic shielding member 220 is installed on the rotor housing 210. In some embodiments, the magnetic shielding member 220 is embedded in the inner circumferential side of the surrounding portion 211. Then, a plurality of permanent magnets 230 are installed on the inner circumferential side of the rotor housing 210, for example, by pushing the plurality of permanent magnets 230 between adjacent spacer teeth 222. Then, the rotor housing 210, the magnetic shielding member 220, and the plurality of permanent magnets 230 are bonded together with structural adhesive, and the structural adhesive is cured. Then, the shaft member 240 is assembled with the rotor housing 210 to obtain the assembled rotor assembly 200. Then, the stator assembly 100 with the bearing 300 installed is assembled with the rotor assembly 200 so that the abutment portion 241a abuts against the end face of one end of the bearing 300 along the axial direction. In some embodiments, the assembly process of the plant protection drone power motor 1000 further includes: after the stator assembly 100 and the rotor assembly 200 are assembled, other components such as the heat dissipation cover 400, the ground pad, the retaining ring, and the anti-loosening cover are installed on the plant protection drone power motor 1000.

[0052] According to some embodiments of the agricultural drone power motor 1000 of this application, the rotor housing 210 includes an integrally formed surrounding portion 211 and a cover portion 212. The surrounding portion 211 and the cover portion 212 are formed, for example, by an integral stamping and stretching process, which simplifies the assembly process of the agricultural drone power motor 1000, increases structural assembly precision, and improves the electromagnetic performance and working efficiency of the agricultural drone power motor 1000. Compared with related technologies, by eliminating the process of first stretching the cover profile and then milling the thin stretched structure to obtain the magnetic shielding component, the processing time and cost of the drone power motor 1000 components are reduced. In some embodiments of this application, the magnetic shielding component 220 is an injection-molded part. This design structure has high production efficiency and is better adapted to the weight sensitivity of agricultural drones, thereby achieving a good overall weight optimization effect and indirectly reducing the payload of the agricultural drone, improving the flight efficiency of the agricultural drone, and at the same time reducing the operating temperature rise and cost of the agricultural drone power motor 1000.

[0053] According to some embodiments of the agricultural drone power motor 1000 of this application, the surrounding part 211 and the cover part 212 are formed, for example, by an integral stamping and stretching process. The rotor housing 210 is simplified from the complex structure of separate installation and assembly of the cover and metal ring in related technologies to a single component. Since the rotor housing 210 adopts an integral design, the structural strength of the rotor housing 210 is improved. Compared with related technologies, it is no longer necessary to ensure the connection strength through interference fit and structural adhesive bonding, and the confidential screw assembly process between the cover and the metal ring in related technologies is eliminated. This solves the risk of the cover and metal ring separating and falling off during long-term operation or harsh working conditions of the agricultural drone power motor.

[0054] In related technologies, the cover and the metal ring are separate components, and the metal ring is usually made of low-carbon steel. The metal ring structure in these technologies is relatively thin, making processing difficult and costly. Furthermore, during processing, the surface of low-carbon steel is prone to linear cracks, and due to excessive deformation and internal stress, it is difficult to guarantee dimensional accuracy and roundness. According to some embodiments of the agricultural drone power motor 1000 of this application, the surrounding portion 211 and the cover portion 212 are integrally formed. The cover portion 212 provides excellent support for the surrounding portion 211, thereby further improving the stability and structural strength of the agricultural drone power motor 1000, while also ensuring that the surrounding portion 211 has high dimensional accuracy and roundness.

[0055] This application also provides an agricultural drone. The agricultural drone includes the agricultural drone power motor 1000 and propeller assembly of any of the foregoing embodiments. The agricultural drone power motor 1000 includes a stator assembly 100 and a rotor assembly 200. The propeller assembly is connected to the rotor assembly 200 of the agricultural drone power motor 1000. The rotor assembly 200 is at least partially sleeved on the outer periphery of the stator assembly 100.

[0056] The rotor assembly 200 includes a separately configured rotor housing 210, a magnetic shielding element 220, and a plurality of permanent magnet elements 230. The magnetic shielding element 220 is separately configured from the rotor housing 210. The rotor housing 210 is rotatably fitted with the stator assembly 100, and the rotor housing 210 is at least partially fitted onto the outer periphery of the stator assembly 100. The magnetic shielding element 220 is mounted on the rotor housing 210. The plurality of permanent magnet elements are arranged circumferentially on the inner periphery of the rotor housing 210 and spaced apart from each other by the magnetic shielding element 220.

[0057] According to an embodiment of this application, an agricultural drone includes an agricultural drone power motor 1000 and a propeller assembly. The rotor assembly 200 of the agricultural drone power motor 1000 includes a rotor housing 210, a magnetic shielding component 220, and multiple permanent magnets 230. The magnetic shielding component 220 is separately disposed from the rotor housing 210 and is mounted on the rotor housing 210. Since the magnetic shielding component 220 and the rotor housing 210 are separate components, the magnetic shielding component 220 can be manufactured separately during the manufacturing process of the rotor assembly 200. Compared with related technologies, the magnetic shielding component no longer needs to be obtained by first stretching the cover material and then milling it on a thin stretched structure, thereby reducing the manufacturing difficulty of the magnetic shielding component 220 and ensuring better processing accuracy, thus facilitating the improvement of the manufacturing accuracy of the rotor assembly 200.

[0058] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. An agricultural unmanned aerial vehicle power motor, characterized in that, include: Stator assembly; The rotor assembly includes a separately configured rotor housing, a magnetic shielding component, and a plurality of permanent magnet components. The rotor housing is rotatably fitted with the stator assembly. The rotor housing is at least partially fitted around the outer periphery of the stator assembly. The magnetic shielding component is installed on the rotor housing. The plurality of permanent magnet components are arranged circumferentially on the inner periphery of the rotor housing and are spaced apart from each other by the magnetic shielding component.

2. The power motor for agricultural drones as described in claim 1, characterized in that, The rotor housing includes an integrally formed surrounding portion and a cover portion. The surrounding portion surrounds the outer periphery of the stator assembly, and the cover portion is located at one end of the surrounding portion along the axial direction. The cover portion covers one end face of the stator assembly along the circumferential direction.

3. The power motor for agricultural drones as described in claim 2, characterized in that, The cover has a hollow structure.

4. The power motor for agricultural drones as described in claim 2, characterized in that, The magnetic shielding component is embedded in the inner circumference of the surrounding portion.

5. The power motor for agricultural drones as described in claim 1, characterized in that, The magnetic shielding component includes a support ring and a plurality of spacer teeth. The plurality of spacer teeth extend outward from one side end of the support ring along the axial direction and are arranged in a circumferential, spaced arrangement.

6. The power motor for agricultural drones as described in claim 1, characterized in that, The magnetic shielding component is an injection molded part, and is fixedly connected to the rotor housing and the plurality of permanent magnets by cured structural adhesive.

7. The power motor for agricultural drones as described in claim 1, characterized in that, The stator assembly includes a stator base and a stator core mounted on the stator base. The rotor assembly further includes a rotating shaft connected to the rotor housing. The rotating shaft passes through the stator base and rotatably engages with the stator base. The power motor of the agricultural drone also includes: A propeller mounting base is fixedly connected to the rotating shaft and is used to connect the propeller assembly.

8. The power motor for agricultural drones as described in claim 7, characterized in that, The rotating shaft includes an insertion part and a mounting part. The insertion part is used to pass through the stator seat. The mounting part is located at one end of the insertion part along the axial direction and is exposed outside the rotor housing. The mounting part is provided with a first connection hole for connecting with the propeller mounting base.

9. The power motor for agricultural drones as described in claim 8, characterized in that, The power motor for the agricultural drone also includes: The bearing is disposed between the protruding portion and the stator seat. The extended portion is provided with an abutting portion, which abuts against the end face of one end of the bearing along the axial direction.

10. A plant protection drone, characterized in that, include: The power motor for agricultural drones as described in any one of claims 1 to 9; as well as The propeller assembly is connected to the rotor assembly of the power motor of the agricultural drone.

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