WO2020010764A1

WO2020010764A1 - Motor, power assembly and unmanned aerial vehicle

Info

Publication number: WO2020010764A1
Application number: PCT/CN2018/114799
Authority: WO
Inventors: 罗东东
Original assignee: 深圳市道通智能航空技术有限公司
Priority date: 2018-07-11
Filing date: 2018-11-09
Publication date: 2020-01-16
Also published as: CN208874369U

Abstract

Disclosed in the embodiments of the present application are a motor, a power assembly and an unmanned aerial vehicle. The motor comprises a stator and a rotor sleeved on the outer periphery of the stator and rotatable around the stator; the stator comprises a stator base, an iron core, a coil and an adhesive layer, the iron core being sleeved outside the stator base, the coil being wound on the iron core, and the coil being wrapped by the adhesive layer; and the rotor is mounted to the stator base. By means of the above embodiments, the embodiments of the present application can avoid contact between the coil of the motor and water, improving the waterproof performance of the motor, and enabling the motor and the power assembly thereof to operate normally even in rain or a wet environment.

Description

Motors, power components and drones

This application claims the priority of a Chinese patent application filed on July 11, 2018 with the Chinese Patent Office, with the application number 2018210977454, and the application name is "Motor, Power Component and Drone", the entire contents of which are incorporated herein by reference. in.

Technical field

The embodiments of the present application relate to the technical field of drones, and in particular, to a motor, a power component, and a drone.

Background technique

Unmanned aerial vehicle (UAV) is an unmanned aircraft that controls flight attitude through radio remote control equipment and built-in programs. Due to its advantages such as maneuverability, fast response, unmanned operation, and low operating requirements, etc. , Has been widely used in aerial photography, plant protection, power inspection, disaster relief and many other fields.

Generally, a drone drives a propeller to rotate through a motor mounted on the arm, and completes various flight attitudes by controlling the rotation of the propeller.

In the process of implementing this application, the inventors found that currently, the motor is poor in water resistance, and water entering the motor will affect the performance of the motor, which makes it difficult for the drone to work in rainy or underwater conditions, and it is difficult to adapt to different flight environments. .

Summary of the invention

In view of this, the embodiments of the present application provide a motor, a power component, and a drone, which can improve the waterproof protection level of the motor, and further improve the waterproof performance of the drone, so that the drone can work in rain or underwater Suitable for different flying environments.

In order to solve the above technical problem, a technical solution adopted in the present application is to provide a motor including: a stator and a rotor sleeved around the outer periphery of the stator and capable of rotating around the stator; wherein the stator includes a stator base , An iron core, a coil, and a glue filling layer, the iron core is sleeved outside the stator base, the coil is wound around the iron core, the glue filling layer surrounds the coil, and the rotor is mounted on The stator base.

Optionally, the stator further includes a bearing, and the rotor is mounted on the stator base through the bearing; the bearing is a waterproof bearing.

Optionally, the waterproof bearing is a stainless steel bearing or a ceramic bearing.

Optionally, the stator base is an aluminum alloy casting, and a first waterproof layer is formed on a surface thereof.

Optionally, the iron core includes a main body and an insulating layer that completely covers a surface of the main body and has a waterproof performance.

Optionally, the rotor includes a housing, a plurality of permanent magnets, an outer cover, and a rotating shaft;

The casing is rotatably sleeved on the outer periphery of the core and can rotate around the core; the plurality of permanent magnets are disposed on a surface of the casing facing the core and between the core and the core A gap is provided; the outer cover is connected to an end of the housing away from the stator base; one end of the rotating shaft is tightly connected to the outer cover, and the other end is installed on the stator base so that the rotor Rotatable around the stator.

Optionally, a second waterproof layer is formed on the surface of the casing.

Optionally, the second waterproof layer is formed by anodizing the surface of the casing.

Optionally, the surfaces of the plurality of permanent magnets are plated with a double nickel layer.

Optionally, the outer cover is an aluminum alloy casting, and a third waterproof layer is formed on a surface thereof.

In order to solve the above technical problem, another technical solution adopted in the present application is to provide a power component, which includes a motor as described above, and a propeller mounted on the motor.

In order to solve the above technical problem, another technical solution adopted in the present application is to provide an unmanned aerial vehicle, which includes a fuselage, an arm connected to the fuselage, and the arm mounted on the arm as described above. The power components described above.

Different from the situation of the prior art, the embodiment of the present application has the beneficial effect that the coil of the motor provided by the embodiment of the present application is covered with a glue-filling layer, and the coil is isolated from the outside by the glue-filling layer, which can avoid the coil and the Water contact improves the waterproof performance of the motor and enables the motor and its power components to operate normally even in rain or humid environments.

BRIEF DESCRIPTION OF THE DRAWINGS

One or more embodiments are exemplified by the pictures in the accompanying drawings. These exemplary descriptions do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the drawings in the drawings do not constitute a limitation on scale.

FIG. 1 is a schematic diagram of a three-dimensional structure of a drone provided by one embodiment of the present application; FIG.

2 is an exploded view of the structure of the drone shown in FIG. 1;

3 is an exploded view of the drone shown in FIG. 1 from another perspective;

4 is a partially enlarged view of part A in FIG. 3;

5 is an exploded view of a motor in the drone shown in FIG. 3;

6 is an exploded view of the motor shown in FIG. 5 from another perspective.

detailed description

In order to facilitate understanding of the present application, the present application will be described in more detail below with reference to the drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it may be directly on the other element, or there may be one or more centered elements in between. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "up", "down", "left", "right", "horizontal", "vertical" and similar expressions used in this specification are for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used in this specification have the same meanings as commonly understood by those skilled in the technical field of this application. The terms used in the description of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. In addition, the technical features involved in the embodiments of the present application described below can be combined with each other as long as they do not constitute a conflict with each other. The term "and / or" used in this specification includes any and all combinations of one or more of the associated listed items.

At present, the waterproof and dustproof ability of the motor is poor. The reason is found by the inventors that this is mainly because the conventional motor generally adopts an open cover or stator seat design in order to improve the heat dissipation capacity of the motor, which leads to the stator coil. It is exposed to the outside, and after the water enters the inside of the motor, it is easy to cause a short circuit between the coils and affect the operation of the motor.

Based on this, the embodiment of the present application provides a motor. The stator coil is wrapped with a glue-filling layer. The glue-filling layer can isolate the coil from the outside. Even if water enters the inside of the motor, it will not affect the operation of the motor. . Further, an embodiment of the present application further provides a power assembly including the motor and an unmanned aerial vehicle. The motor and its power components can be applied to any movable object driven by the motor, such as drones, ships, robots, etc .; the drone can be any type of unmanned aerial vehicle, which can include but is not limited to: Single-rotor drone, multi-rotor drone, tilt-rotor drone, etc.

FIG. 1 is a schematic structural diagram of a drone provided by one embodiment of the present application. Referring to FIG. 1, the drone 100 includes a fuselage 10, four arms 20 extending from the fuselage 10, and A power assembly 30, a landing gear 40, and a protective cover 50 are provided on each of the arms 20. That is, the drone 100 of the present application is a quadrotor drone, and the number of the power components 30 is four. In other possible embodiments, the drone 100 may be any other suitable type of rotor drone, such as a double-rotor drone, a six-rotor drone, or the like. When the power module 30 is applied to other types of unmanned aerial vehicles, the number of the power modules 30 may be changed according to actual needs, which is not limited in the embodiment of the present application.

In other possible embodiments, the drone 100 may further include a pan / tilt (not shown), which is installed at the bottom of the fuselage 10. The pan / tilt is used to carry a high-definition digital camera or other camera device to eliminate high-definition digital Disturbances on the camera or other camera devices ensure the clarity and stability of the video captured by the camera or other camera devices.

In an embodiment of the present application, one end of the arm 20 is fixedly connected to the fuselage 10. Preferably, the arm 20 is integrally formed with the fuselage 10. In other possible embodiments, the arm 20 may also be connected to the fuselage 10 in a manner of being expanded or folded relative to the fuselage 10. For example, the arm 20 may be connected to the fuselage 10 through a rotating shaft mechanism, so as to realize the expansion or folding of the arm 20 relative to the fuselage 10.

The power assembly 30 is installed at the other end of the airframe 20 (ie, the end far from the fuselage 10), and is used to provide power to the drone 100 and drive the drone 100 to fly and Adjust the flight attitude. In the embodiment of the present application, the power assembly 30 includes a motor 31 and a propeller 32 driven by the motor 31. The propeller 32 is installed on an output shaft of the motor 31. The propeller 32 is driven by the motor 31 to generate a UAV 100 Flying lift or thrust. The motor 31 may be any suitable type of motor, such as a brushed motor, a brushless motor, a DC motor, a stepper motor, an AC induction motor, and the like. The power assembly 30 in the embodiment of the present application further includes an electronic speed governor (not shown) disposed in a cavity formed by the fuselage 10 or the arm 20, and the electronic speed governor is used according to a throttle controller or a throttle generator. The generated throttle signal generates a motor control signal for controlling the rotation speed of the motor to obtain a flying speed or a flying attitude required by the drone 100.

In one implementation, the throttle controller or the throttle generator may be a flight control module of the drone 100. The flight control module senses the environment around the drone 100 through various sensors, and controls the flight of the drone 100. The flight control module may be a processing module (Application Unit), an Application Specific Integrated Circuit (ASIC), or a Field Programmable Gate Array (FPGA).

When the user inputs an instruction to control the flying attitude of the drone 100 through the remote control, the flight control module of the drone 100 sends a throttle signal to the electric control board, and the electric control board receives the throttle signal, generates and sends the signal to the motor. Motor control signals for starting the motor and controlling the rotation speed of the motor.

In an embodiment of the present application, the landing gear 40 is disposed on the fuselage 10 or the airframe 20, and is configured to make the drone 100 stop on the ground smoothly when the drone 100 lands. Or on a plane, it plays a supporting role. The protective cover 50 is installed below the fuselage 10, and is used to at least partially cover equipment or materials (such as gimbals, carrying materials, etc.) carried by the drone 100 so as to protect it from water. .

Specifically, please refer to FIG. 2 and FIG. 3 together. The fuselage 10 includes an upper case 101 and a lower case 103 which are oppositely disposed and fixedly connected. The upper case 101 and the lower case 103 may pass through Fixed connection in any way, such as closed cover connection, snap connection, screw connection, etc. Wherein, in some embodiments, in order to improve the waterproof performance of the drone 100, the connection between the upper case 101 and the lower case 103 may be coated with a sealant or a waterproof gasket, which can be avoided The external liquid enters the receiving space 102 formed by the upper case 101 and the lower case 103 through a gap at the connection between the upper case 101 and the lower case 103.

After the upper case 101 and the lower case 103 are fixedly connected, a receiving space 102 is formed for receiving various devices mounted on the drone 100. For example, the containment space 102 contains a control circuit assembly 104 composed of electronic components such as a MCU. The control circuit assembly 104 may specifically be a printed circuit board assembly (PCBA). The control circuit assembly 104 It can include multiple control modules, such as a flight control module for controlling the drone's flight attitude, a Beidou module for navigating the drone, and a device for processing related airborne equipment (such as a PTZ). Data processing module for environmental information.

Wherein, in this embodiment, the control circuit component 104 is fixedly installed on the lower case 103, which can facilitate the electrical connection between the control circuit component 104 and other devices (such as a PTZ). In some other embodiments, the control circuit assembly 104 may also be fixedly installed on the upper casing 101 or other suitable positions, as long as the control circuit assembly 104 can be accommodated between the accommodation spaces 102. can.

Further, in order to prevent a short circuit caused by the wiring connection on the control circuit component 104, a protective film may be further provided on the surface of the control circuit component 104. In some embodiments, the protective film is a three-proof insulating paint (eg, ULTIMEG2000-620X) coated on the surface of the control circuit assembly 104. A protective layer is formed on the surface of the circuit component 104. In this embodiment, by providing a protective layer on the surface of the control circuit component 104, the control circuit component 104 can be protected from environmental erosion, and the control circuit component 104 can be lifted from the inside of the fuselage 10. Water and dust resistance. Of course, in other embodiments, the protective layer may be omitted when the body 10 itself has good waterproof and dustproof performance.

In addition, the lower case 103 is provided with a heat dissipation hole 106 for dissipating heat from the inside of the fuselage 10 to prevent the control circuit assembly 104 and other devices contained in the fuselage 10 from being caused by the surrounding environment. Excessive temperature and abnormal operation or failure. It can be understood that, in other embodiments, the heat dissipation hole 106 may also be disposed in the upper casing 101, which is not specifically limited in this embodiment of the present application. Further, in some embodiments, in order to prevent water droplets from flowing into the inside of the fuselage 10 from the heat dissipation hole 106, a waterproof and breathable film may be provided at the heat dissipation hole 106 (that is, the heat dissipation hole 106 is covered with Waterproof breathable membrane), the material of the waterproof breathable membrane may include, but is not limited to, GORE-TEX film material. By providing a waterproof and breathable film at the heat dissipation hole 106, the breathable and waterproof performance of the heat dissipation hole 106 can be achieved.

Please continue to refer to FIG. 2 and FIG. 3. The machine arm 20 includes an upper machine arm 201 and a lower machine arm 203 which are oppositely disposed and fixedly connected. The upper machine arm 201 extends from the upper machine case 101, and the lower machine arm 20 An arm 203 extends from the lower case 103. The upper arm 201 and the lower arm 203 can be sealed and connected in any manner, such as closing a cover, a buckle, etc., and in order to improve the waterproof performance of the drone 100, the upper arm 201 and The connection portion of the lower machine arm 203 may be coated with a sealant or provided with a waterproof gasket.

The upper machine arm 201 and the lower machine arm 203 are connected to form an accommodation cavity 202, and the accommodation cavity 202 is in communication with the accommodation space 102. Therefore, the upper case 101 and the upper arm 201 are integrally formed, and the lower case 103 and the lower arm 203 are integrally formed. The process is simple and the production cost is low.

It should be understood that, in this embodiment, the fuselage 10 includes an upper case 101 and a lower case 103, and a receiving space 102 is formed between the upper case 101 and the lower case 103; The arm 20 includes an upper arm 201 and a lower arm 203, and an accommodation cavity 202 is formed between the upper arm 201 and the lower arm 203; and the accommodation space 102 and the accommodation cavity 202 The communication enables the fuselage 10 and the arm 20 to be connected into an integrated structure, which can simplify the manufacturing process and reduce the production cost. In other embodiments, the fuselage 10 may also form the receiving space 102 by other structures, and / or the arm 20 may also form the receiving cavity 202 by other structures. In addition, the fuselage 10 and the boom 20 may also have mutually independent structures (that is, the receiving space 102 formed in the fuselage 10 and the receiving cavity 202 formed in the boom 20 are not Communication), the arm 20 may be mounted on the fuselage 10 by other suitable structures, as long as a receiving space 102 is formed in the fuselage 10 for receiving the control circuit assembly 104 and other related equipment, and, An accommodating cavity 202 for receiving the motor 31 in the power assembly 30 may be formed inside the arm 20.

Referring to FIGS. 3 and 4, an end of the upper arm 201 far from the fuselage 10 (specifically, the upper wall of the receiving cavity 202) is provided with a shaft hole 2010 for receiving the power component 30. In the rotating shaft 3120.

Three mounting holes 2012 are also provided on the outer periphery of the shaft hole 2010 for mounting the motor 31 in the power assembly 30. Particularly, in this embodiment, three mounting holes 2012 are enclosed to form an equilateral triangle, and the shaft hole 2010 is disposed at the center of the equilateral triangle to improve the stability of the connection between the motor 31 and the arm 20 Sex.

It should be understood that, in this embodiment, the motor 31 is mounted on the upper machine arm 201, so that a mounting hole 2012 is opened in the upper machine arm 201. In other embodiments, the motor 31 may also be installed on the lower arm 203, and then the mounting hole 2012 may also be provided on the lower arm 203. In addition, the number of the mounting holes 2012 is not limited to three, and may be one, two, five, etc., as long as the motor 31 can be fixedly installed in the accommodation cavity 202.

Please continue to refer to FIGS. 2 and 3. The power assembly 30 includes a motor 31 and a propeller 32. The propeller 32 is mounted on the motor 31. When the motor 31 is running, the propeller 32 can be driven to rotate in a specific direction (that is, the rotation direction of the motor 31: clockwise or counterclockwise), thereby providing lift for the drone 100, Drive the drone 100 to fly. In particular, in this embodiment, the motor 31 is housed in the accommodating cavity 202, and the propeller 32 is disposed outside the arm 20, so that the motor 31 can be isolated from water by the arm 20, Prevent water droplets from entering the motor 31 to damage its internal components and affect its performance, thereby improving the protection level and safety performance of the motor 31.

Specifically, in this embodiment, the motor 31 includes a stator 311 and a rotor 312 sleeved on an outer periphery of the stator 311. A rotating shaft 3120 is fixedly installed in the rotor 312, and the rotating shaft 3120 is rotatably connected to the stator 311, so that the rotor 312 can rotate around the stator 311.

In this embodiment, the motor 31 is installed in the machine arm 20 backward, specifically, the stator 311 is fixedly installed in the upper machine arm 201, and the rotating shaft 3120 runs through the stator 311 (also That is, the rotating shaft 3120 is shaft-out on one side of the stator 311), and the upper arm 201 passes through the shaft hole 2010 and is connected to the propeller 32. By mounting the motor 31 backward to the upper arm 201, on the one hand, it is possible to achieve surface contact between the stator 311 and the upper arm 201, and further prevent water from flowing into the arm 20 from the shaft hole 2010, thereby preventing water Into the motor 31; on the other hand, the length of the rotating shaft 3120 can be reduced, the weight of the motor 31 can be reduced, and the weight of the drone 100 can be reduced.

Of course, it can be understood that, in other embodiments, the motor 31 can also be mounted to the lower arm 203 in a forward direction, that is, the stator 311 is fixedly mounted on the lower arm 203, and the rotation A shaft 3120 passes through the rotor 312 (that is, the rotating shaft 3120 exits the shaft on one side of the rotor 312), and the upper arm 201 passes through the shaft hole 2010 and is connected to the propeller 32. As long as the motor 31 is accommodated in the accommodation cavity 202.

Specifically, referring to FIG. 5 and FIG. 6, the stator includes 311 including: a stator base 3111, an iron core 3112, a coil 3113, and a glue layer 3114. The iron core 3112 is sleeved outside the stator base 3111, the coil 3113 is wound around the iron core 3112, and the potting layer 3114 surrounds the coil 3113.

The stator base 3111 is used for fixing the motor 31 to the machine arm 20. In an implementation manner, in order to enhance the heat dissipation effect of the motor 31, the stator base 3111 is provided as an open structure (specifically, the structure in which the airflow in the motor 31 can flow from the stator base 3111 to the outside of the motor 31 can be considered as Open structure). For example, as shown in FIG. 5 or FIG. 6, the diameter of the stator base 3111 is smaller than that of the iron core 3112, and the airflow inside the motor 31 can be directly exchanged with the outside air, thereby achieving the effect of heat dissipation. For another example, in other embodiments, the diameter of the stator base 3111 may be the same as that of the iron core 3112. At this time, a heat dissipation hole may be opened at the bottom end surface of the stator base 3111, so that the motor 31 The internal heat can be discharged through the heat dissipation holes. In practical applications, the stator base 3111 may be formed by processing aluminum alloy or steel (for example, its material is 6061-T6 hard aluminum rod), and its shape may be integrated (such as T-shape) or separated. Style. In this embodiment, the stator base 3111 is processed into an integrated aluminum alloy casting by using an aluminum alloy material to enhance its stability and thermal conductivity. Further, in this embodiment, the surface of the stator base 3111 is further formed with a first waterproof layer through hard oxidation treatment, and the corrosion resistance and oxidation resistance of the stator base 3111 can be improved through the first waterproof layer. , Which in turn improves its own level of protection. After treatment, the stator base 3111 has corrosion resistance and oxidation resistance, and its protection level can reach IP65. When the heat dissipation problem of the motor is taken into consideration, when the heat dissipation hole 4 is opened on the bottom end surface of the stator base 3111, the protection level of the stator base 3111 will be reduced to IP55 level accordingly.

A bearing cavity 3115 is provided inside the stator base 3111, and a bearing 3116 is sleeved inside the bearing cavity 3115. The bearing 3116 is used to cooperate with the rotating shaft 3120 to drive the rotating shaft 3120 to rotate relative to the stator 311. In this embodiment, in order to improve the moisture resistance performance of the bearing 3116, the bearing 3116 may be a waterproof bearing. For example, in some embodiments, a stainless steel bearing or a ceramic bearing can be used, and the two can be selected according to the actual application situation. For example, if the rotation speed requirement of the motor 31 is low, a stainless steel bearing may be selected; if the rotation speed requirement of the motor 31 is high, a ceramic bearing may be selected; this embodiment of the present application does not specifically limit this.

The iron core 3112 includes a main body and an insulating layer covering a surface of the main body. The insulating layer is used to isolate the main body and the coil 3113 to prevent a short circuit phenomenon of the motor 31. Generally, the body can be made of materials that can be easily magnetized (such as steel, nickel, iron, etc.), and the insulating layer can be formed of any material with insulating properties, such as plastic, digital powder, 3M860E powder, etc. . In order to reduce the weight of the motor, the body may be formed by stacking steel sheets, and the insulation layer may be formed of 3M860E powder coated on the surface of the body. However, if this structure is adopted, the side of the body is not protected, and it is susceptible to moisture and rust, thereby affecting the performance and life of the motor 31. Therefore, in this embodiment, in order to improve the moisture resistance performance of the iron core 3112, the body is formed by stacking silicon steel sheets, the insulation layer completely covers the surface of the body, and has waterproof performance. For example, in some embodiments, the insulating layer may be formed by performing an electrophoresis or anodizing treatment on the surface of the body (silicon steel sheet).

The coil 3113 includes at least one layer. The coil 3113 can be wound by a single or multiple enameled copper wires. The number of turns of the coil 3113 can be set to 15 turns, 16 turns, 17 turns, etc., preferably In order to reduce the heat generation while ensuring the torque of the motor 31, the number of turns of the coil 3113 can be set to 16 turns.

The potting layer 3114 surrounds the coil 3113. The potting layer 3114 may be an epoxy resin layer. In practical applications, after assembling the iron core 3112 and the coil 3113, the component can be potted with potting technology, so as to form the potting layer 3114 on the outer periphery of the coil. In this embodiment, by providing the glue layer 3114, the coil 3113 can be isolated from the outside, and water can be prevented from contacting the coil 3113, so that the protection of the motor 31 can be improved from the inside of the motor 31 grade. When the coil 3113 is wrapped with epoxy resin, the protection level of the coil 3113 can be increased to IP57.

5 and FIG. 6, the rotor 312 includes a housing 3121, a plurality of permanent magnets 3122, an outer cover 3123, and the rotating shaft 3120. Wherein, the housing 3121 is rotatably sleeved on the outer periphery of the iron core 3112 and can rotate around the iron core 3112; the plurality of permanent magnets 3122 are provided on a surface of the housing 3121 facing the iron core 3112 and A gap is provided with the iron core 3112; the outer cover 3123 is connected to an end of the housing 3121 away from the stator base 3111; one end of the rotating shaft 3120 is fastened to the outer cover 3123, and One end passes through a bearing 3116 in the stator base 3111, and protrudes from the stator base 3111, and is used for non-rotation connection with the propeller 32 to drive the propeller 32 to rotate.

Of course, it can be understood that in other embodiments, one end of the rotating shaft 3120 may be mounted on the stator base 3111, and the other end may protrude from the outer cover 3123 (that is, the rotating shaft 3120 is at The rotor 312 has a shaft on one side), and the rotating shaft 3120 is fastened to the outer cover 3123, which will not be described in detail in the embodiment of the present application.

The casing 3121 has a cylindrical structure and can be made of high-efficiency magnetic conductive materials such as 10 # steel and 20 # steel. Further, in order to improve the corrosion resistance of the casing 3121, a second waterproof layer may be formed on a surface of the casing 3121. In some embodiments, the second waterproof layer may be formed by performing a black anodization (electrophoresis) treatment on a surface of the outer case 3121. After treatment, the protection level of the housing 3121 can reach IP55. In actual application, when the motor 31 is installed on the arm 20 of the drone 100, in order to prevent the motor interference phenomenon, prevent the motor from being stuck and cause the motor to crash, and reduce the safety of the drone 100, the housing 3121 The distance between the bottom (ie, the end of the housing 3121 near the stator base 311) and the arm 20 is between 0.4 mm and 1 mm.

The shape of the permanent magnet 3122 may be any shape such as an arc shape, a rectangle, and the like. According to the requirements of the motor 31, the number can be set to any number, such as 10, 14, 16, and 18 pieces. The material of the permanent magnet 3122 may be magnetic materials such as ferrite, neodymium iron boron, samarium cobalt permanent magnet material (SmCo). In this embodiment, in order to meet the performance requirements of the motor 31 and improve the heat dissipation efficiency of the motor 31 at the same time, the material of the permanent magnet 3122 may be neodymium iron boron, and the thickness or average thickness thereof is set to 1.1 mm. In addition, in this embodiment, the surface of the permanent magnet 3122 is further plated with a double-layer nickel layer to improve the corrosion resistance and oxidation resistance of the permanent magnet 3122. After nickel plating, the permanent magnet 3122 can have corrosion resistance and oxidation resistance, and its protection level can reach IP55.

The outer cover 3123 may also be an open structure. The outer cover 3123 is provided with a plurality of heat dissipation holes 3124 that allow air circulation. The heat dissipation holes 3124 are arranged along the circumferential direction of the outer cover 3123 to further enhance Heat dissipation efficiency of the motor 31. In this embodiment, the outer cover 3123 may also be an aluminum alloy casting (for example, the material is a 6061-T6 hard aluminum rod), and a third waterproof layer is formed on the surface after hard oxidation treatment, so that The outer cover 3123 is provided with corrosion resistance and oxidation resistance, and is not easily damaged by corrosive substances in water or other liquids. After treatment, the protection level of the outer cover 3123 can reach IP65. When a heat dissipation hole 3124 is opened in the outer cover 3123 in consideration of the heat dissipation problem of the motor, the protection level of the outer cover 3123 will therefore be reduced to IP55.

One end of the rotating shaft 3120 is tightly connected with the outer cover 3123, and the other end passes through a bearing 3116 in the stator base 3111, and is rotatable with the stator 311. In order to increase the tightness between the rotating shaft 3120 and the outer cover 3123 and thereby increase the mechanical strength of the motor 31, the rotating shaft 3120 may be provided with a rough surface at the fastening connection with the outer cover 3123. Or flat position, the rough surface may be knurled, and its length is less than or equal to the thickness of the outer cover 3123 to avoid the rough surface or flat position from affecting the installation of the propeller or interference with the bearing of the stator. In addition, the material of the rotating shaft 3120 may be stainless steel with wear resistance and corrosion resistance, such as 420 stainless steel, 316 stainless steel, and the like. 420 stainless steel itself has certain wear resistance and corrosion resistance, and the protection level can reach IP55. When the motor needs to be used under more severe conditions, in order to meet the strength requirements, 316 stainless steel can be used, but compared to 420 stainless steel, 316 stainless steel is more expensive.

Please refer to FIG. 2 again, the landing gear 40 is disposed on a side of the lower aircraft arm 203 facing away from the upper aircraft arm 201 and extends in a direction away from the power assembly 30. In this embodiment, the landing gear 40 and the lower arm 203 are integrally formed, which can simplify the process steps. In other embodiments, the landing gear 40 may also be hinged to the lower arm 203 so that the landing gear 40 can rotate relative to the arm 20 for easy storage. Alternatively, in still other embodiments, the landing gear 40 may also be installed at other suitable positions, for example, below the lower casing 103, which are not specifically limited in the embodiments of the present application.

The protective cover 50 can be any waterproof protective cover, which is tightly matched with the side of the lower case 103 facing away from the upper case 101 so as to isolate the components in the protective case from water. Further, in order to ensure the tightness between the protective cover 50 and the lower case 103, a sealant may also be added at the connection between the protective cover 50 and the lower case 103. Furthermore, in some embodiments, the protective cover 50 is mainly used for waterproofing the PTZ, and the PTZ is mainly used for image acquisition. Therefore, in order to ensure the shooting effect of the PTZ, the protective cover 50 may be specifically A transparent plastic waterproof cover. By providing the protective cover 50, the gimbal mounted on the drone 100 can be effectively waterproofed.

It should be understood that, in this embodiment, the motor 31 in the power assembly 30 is housed in a receiving cavity 202 formed in the arm 20, and the motor 31 can be received through the arm 20 It is isolated from the outside world to reduce the possibility of water entering the motor 31, so that the motor 31 can be waterproofed from the inside to the outside. In some other embodiments, for example, in a flight environment with relatively low water resistance requirements, the motor 31 may also be installed outside the airframe 20 (for example, installed above the airframe 20). ), Is exposed to the outside, and the coil 3113 is waterproof-protected only through the potting layer 3114. The embodiment of the present application does not specifically limit the installation position and application scenario of the motor 31.

In general, different from the situation of the prior art, the coil provided in the motor of the embodiment of the present application is covered with a glue-filling layer, and the coil is isolated from the outside by the glue-filling layer to prevent the coil from contacting water. Therefore, the waterproof performance of the motor is improved, so that the motor and its power components can operate normally even in rain or humid environment.

Further, the unmanned aerial vehicle provided in the embodiment of the present application houses the motor in the power assembly in the arm, which can isolate the motor from the outside by the arm, reduce the possibility of water entering the motor, and thereby improve the protection level of the motor. As well as safety performance, the drone can work in rainy weather or underwater, which is suitable for more flying environments.

It should be noted that the preferred embodiments of the present application are given in the description of the present application and the accompanying drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the present specification. These examples are not intended as an additional limitation on the content of this application, and the examples are provided to make the understanding of the disclosure of this application more thorough and comprehensive. In addition, the above technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope described in the description of this application; further, for those of ordinary skill in the art, improvements or changes can be made according to the above description. All these improvements and transformations should fall within the protection scope of the appended claims of this application.

Claims

A motor, comprising: a stator and a rotor sleeved on the outer periphery of the stator and rotatable around the stator;

Wherein, the stator includes a stator base, an iron core, a coil, and a glue filling layer, the iron core is sleeved outside the stator base, the coil is wound around the iron core, and the glue filling layer surrounds the Said coil; said rotor is mounted on said stator base.
The motor according to claim 1, wherein the stator further comprises a bearing, and the rotor is mounted on the stator base through the bearing; and the bearing is a waterproof bearing.
The motor according to claim 2, wherein the waterproof bearing is a stainless steel bearing or a ceramic bearing.
The motor according to any one of claims 1 to 3, wherein the stator base is an aluminum alloy casting, and a first waterproof layer is formed on a surface thereof.
The motor according to any one of claims 1 to 4, wherein the iron core includes a main body and an insulating layer that completely covers a surface of the main body and has a waterproof performance.
The motor according to any one of claims 1-5, wherein the rotor includes a housing, a plurality of permanent magnets, an outer cover, and a rotating shaft;

The casing is rotatably sleeved on the outer periphery of the core and can rotate around the core; the plurality of permanent magnets are disposed on a surface of the casing facing the core and between the core and the core A gap is provided; the outer cover is connected to an end of the housing away from the stator base; one end of the rotating shaft is tightly connected to the outer cover, and the other end is installed on the stator base so that the rotor Rotatable around the stator.
The motor according to claim 6, wherein a second waterproof layer is formed on a surface of the casing.
The motor according to claim 7, wherein the second waterproof layer is formed by anodizing a surface of the casing.
The motor according to any one of claims 6 to 8, wherein the surfaces of the plurality of permanent magnets are plated with a double-layer nickel layer.
The motor according to any one of claims 6 to 9, wherein the outer cover is an aluminum alloy casting, and a third waterproof layer is formed on a surface thereof.
A power component, comprising: the motor according to any one of claims 1 to 10; and a propeller mounted on the motor.
An unmanned aerial vehicle is characterized by comprising a fuselage, a boom connected to the fuselage, and the power assembly according to claim 11 installed on the boom.