阅读说明：本技术 电机、动力装置及无人飞行器 (Motor, power device and unmanned vehicles ) 是由 李金鑫 范岩峰 郑再峰 于 2020-04-21 设计创作，主要内容包括：一种电机(100)、动力装置(4000)及无人飞行器(1000)。电机(100)包括底座(10)、定子(30)及转子(20),转子(20)罩设在底座(10)上并形成收容空间(15),定子(30)固定连接在底座(10)上且位于收容空间(15)内。转子(20)包括第一盖体(21)及第二盖体(22),第一盖体(21)包括顶壁(211)及侧壁(212),侧壁(212)连接在顶壁(211)的外缘,侧壁(212)上开设有通孔(213),通孔(213)连通收容空间(15)与外界。第二盖体(22)包括基体(221)及离心件(222),基体(221)连接在顶壁(211)上,离心件(222)连接在基体(221)上,离心件(222)转动时产生通过通孔(213)的气流,以使收容空间(15)与外界进行气体交换。(A motor (100), a power device (4000) and an unmanned aerial vehicle (1000) are provided. The motor (100) comprises a base (10), a stator (30) and a rotor (20), wherein the rotor (20) is covered on the base (10) and forms an accommodating space (15), and the stator (30) is fixedly connected to the base (10) and is positioned in the accommodating space (15). The rotor (20) comprises a first cover body (21) and a second cover body (22), the first cover body (21) comprises a top wall (211) and a side wall (212), the side wall (212) is connected to the outer edge of the top wall (211), a through hole (213) is formed in the side wall (212), and the through hole (213) is communicated with the accommodating space (15) and the outside. The second cover body (22) comprises a base body (221) and a centrifugal piece (222), the base body (221) is connected to the top wall (211), the centrifugal piece (222) is connected to the base body (221), and when the centrifugal piece (222) rotates, airflow passing through the through hole (213) is generated, so that the accommodating space (15) and the outside are subjected to air exchange.)

1. The utility model provides a motor, its characterized in that, motor includes base, stator and rotor, the rotor cover is established on the base and form accommodating space, stator fixed connection just is located on the base in accommodating space, the rotor can for the base reaches the stator rotates, the rotor includes:

the first cover body comprises a top wall and a side wall, the side wall is connected to the outer edge of the top wall, a through hole is formed in the side wall, and the through hole is communicated with the accommodating space and the outside; and

the second cover body comprises a base body and a centrifugal piece, the base body is connected to the top wall, the centrifugal piece is connected to the base body, and airflow passing through the through hole is generated when the centrifugal piece rotates, so that the accommodating space is subjected to gas exchange with the outside.

2. The electric machine of claim 1, wherein the first cover comprises a metallic material; and/or

The second cover body comprises a plastic material.

3. The electric machine of claim 1 wherein said top wall includes a plurality of spaced ribs and said centrifuge includes a plurality of centrifuge blades, said centrifuge blades being positioned between adjacent said ribs.

4. The motor according to any one of claims 1 to 3, wherein the first cover further comprises a connecting protrusion connected to the top wall, the base body is provided with a connecting through hole, and the connecting protrusion extends into the connecting through hole and is matched with the connecting through hole.

5. The motor of claim 4, wherein the rotor is configured to drive the rotating member to rotate, and the connecting protrusion has a fixing hole formed thereon to allow the locking member to pass through the rotating member and the fixing hole and to fixedly connect the rotating member and the rotor.

6. The motor according to any one of claims 1 to 3, wherein the rotor is configured to be fixedly connected to a rotating member and drive the rotating member to rotate, the base has an avoiding groove, the avoiding groove and the centrifugal member are located on opposite sides of the base, and the avoiding groove is configured to avoid the rotating member.

7. The motor according to any one of claims 1 to 3, wherein the rotor further comprises a yoke, the first cover further comprises a fixing member connected to the side wall, the fixing member and the top wall are respectively located at two opposite ends of the side wall, and the fixing member is configured to be fixedly connected to the yoke.

8. The electric machine of claim 7, wherein the yoke is annular, the fasteners being in interference fit with the yoke, the fasteners being at least partially embedded in the yoke.

9. The motor of claim 1, wherein the base comprises a base body and a first connecting member, the base body and the first connecting member are integrally formed, the first connecting member and the accommodating space are located on opposite sides of the base body, and the first connecting member is used for connecting with a supporting member.

10. The motor of claim 9, further comprising a second connector removably coupled to the first connector, the first connector coupled to the second connector and adapted to be commonly secured to the support member.

11. The electric machine of claim 10, wherein the first connector is formed with a first notch and the second connector is formed with a second notch, the first notch being opposite the second notch to allow the support member to extend into the first notch and the second notch.

12. The motor of claim 10, wherein the first connecting member defines a first locking hole, the second connecting member defines a second locking hole, the first locking hole is aligned with the second locking hole, and a locking member passes through the first locking hole and the second locking hole and locks the first connecting member and the second connecting member, such that the first connecting member and the second connecting member together clamp the supporting member.

13. The motor of claim 10, further comprising a carrier connected to the second connector, the carrier and the first connector being on opposite sides of the second connector, the carrier configured to mount a sensor.

14. The electric machine of claim 13, wherein the sensors comprise one or more of a distance sensor, an image sensor, a position sensor, an inertial measurement unit, a pressure sensor.

15. The electric machine of claim 13, wherein the carrier is configured to support an unmanned aerial vehicle comprising the support.

16. The motor of claim 9, wherein the base has heat dissipation holes, the base further comprises a filter screen, the filter screen is connected to the base, the filter screen covers the heat dissipation holes, and the aperture of the filter holes of the filter screen is smaller than the aperture of the heat dissipation holes.

17. The electric machine of claim 16, wherein the housing and the first connector comprise a plastic material, and the filter comprises a metal material, and the metal material is fixed to the plastic material by heat fusing.

18. The motor of claim 9, wherein the base body is provided with a wiring hole, the wiring hole is communicated with the accommodating space, the motor further comprises a sealing plug, a connecting circuit passes through the sealing plug to be electrically connected with the motor, and the sealing plug seals the wiring hole.

19. The motor of claim 9, wherein the base defines a first connecting hole, the first connecting hole extending through the first connecting member and the base, and the stator defines a second connecting hole, the second connecting hole being aligned with the first connecting hole to allow a fastener to pass through the first connecting hole and the second connecting hole to fixedly connect the stator to the base.

20. The motor of claim 19, wherein the base further comprises a positioning protrusion protruding from the base body into the accommodating space, the first connecting hole penetrates through the positioning protrusion, a positioning recess is formed on the stator, the second connecting hole is formed at the bottom of the positioning recess, and the positioning protrusion extends into the positioning recess.

21. The motor of claim 9, wherein the base is formed with an avoiding hole, one end of the avoiding hole is communicated with the accommodating space, the other end of the avoiding hole is sealed by the first connecting member, and the stator at least partially extends into the avoiding hole.

22. The motor of claim 9, wherein the base is provided with an avoiding hole, one end of the avoiding hole is communicated with the accommodating space, the other end of the avoiding hole penetrates through the first connecting piece, the base further comprises a sealing member, and the sealing member is arranged in the avoiding hole and seals the end of the avoiding hole away from the stator.

23. The motor of claim 9, wherein the base is formed with a lightening hole, one end of the lightening hole is communicated with the accommodating space, and the other end of the lightening hole is sealed by the first connecting member.

24. The motor of claim 1, wherein the stator includes a connecting portion and a winding portion, the winding portion is connected to an outer periphery of the connecting portion, a shaft hole is formed in the connecting portion, the rotor further includes a rotating shaft, the motor further includes a bearing, the bearing is disposed in the shaft hole, the rotating shaft penetrates through the second cover, the first cover and the bearing, and the rotating shaft is rotatably connected to the connecting portion through the bearing.

25. The power device is characterized by comprising a motor and a blade, wherein the blade is connected with the motor, and the motor can drive the blade to rotate;

the motor includes base, stator and rotor, the rotor cover is established on the base and form accommodating space, stator fixed connection just is located on the base in the accommodating space, the rotor can for the base reaches the stator rotates, the rotor includes:

the first cover body comprises a top wall and a side wall, the side wall is connected to the outer edge of the top wall, a through hole is formed in the side wall, and the through hole is communicated with the accommodating space and the outside; and

the second cover body comprises a base body and a centrifugal piece, the base body is connected to the top wall, the centrifugal piece is connected to the base body, and airflow passing through the through hole is generated when the centrifugal piece rotates, so that the accommodating space is subjected to gas exchange with the outside.

26. The power unit of claim 25, wherein the first cover comprises a metallic material; and/or

The second cover body comprises a plastic material.

27. The power plant of claim 25, wherein said top wall includes a plurality of spaced ribs and said centrifuge member includes a plurality of centrifuge blades, said centrifuge blades being positioned between adjacent ribs.

28. The power unit according to any one of claims 25 to 27, wherein the first cover further comprises a connecting protrusion connected to the top wall, the base body is provided with a connecting through hole, and the connecting protrusion extends into the connecting through hole and is matched with the connecting through hole.

29. The power device of claim 28, wherein the rotor is fixedly connected to the blade through a paddle clip, and the connecting protrusion has a fixing hole formed therein to allow a fastener to penetrate the paddle clip and the fixing hole and fixedly connect the paddle clip to the rotor.

30. The power device according to any one of claims 25 to 27, wherein the rotor is fixedly connected to the blade through a blade clamp, the base body is provided with an avoiding groove, the avoiding groove and the centrifugal piece are located on opposite sides of the base body, and the avoiding groove is used for avoiding the blade clamp and/or the blade.

31. The power plant of any one of claims 25 to 27, wherein the rotor further comprises a yoke, the first cover further comprises a fixing member connected to the side wall, the fixing member and the top wall are respectively located at two opposite ends of the side wall, and the fixing member is configured to be fixedly connected to the yoke.

32. The power unit of claim 31, wherein the yoke is annular, and the fastener is engaged with the yoke by interference fit, the fastener being at least partially embedded in the yoke.

33. The power device according to claim 25, wherein the base comprises a base body and a first connecting member, the base body and the first connecting member are a unitary structure, the first connecting member and the accommodating space are located on opposite sides of the base body, and the first connecting member is used for connecting with a supporting member.

34. The powerplant of claim 33, and further comprising a second connector removably coupled to the first connector, the first connector being coupled to the second connector and adapted to be commonly secured to the support member.

35. The powerplant of claim 34, wherein the first connector is formed with a first notch and the second connector is formed with a second notch, the first notch being opposite the second notch to allow the support member to extend into the first notch and the second notch.

36. The power device according to claim 34, wherein the first connecting member defines a first locking hole, the second connecting member defines a second locking hole, the first locking hole is aligned with the second locking hole, and a locking member passes through the first locking hole and the second locking hole and locks the first connecting member and the second connecting member, such that the first connecting member and the second connecting member clamp the supporting member together.

37. The powerplant of claim 34, wherein the motor further comprises a carrier, the carrier is connected to the second connector, the carrier and the first connector are located on opposite sides of the second connector, and the carrier is configured to mount a sensor.

38. The powerplant of claim 37, wherein the sensors comprise one or more of a distance sensor, an image sensor, a position sensor, an inertial measurement unit, and a pressure sensor.

39. The power plant of claim 37, wherein the carrier is configured to support an unmanned aerial vehicle that includes the support.

40. The power device of claim 33, wherein the base has heat dissipation holes, the base further comprises a filter screen, the filter screen is connected to the base, the filter screen covers the heat dissipation holes, and the aperture of the filter holes of the filter screen is smaller than the aperture of the heat dissipation holes.

41. The power device according to claim 40, wherein the housing and the first connecting member comprise a plastic material, and the filter screen comprises a metal material, and the metal material is fixed on the plastic material by heat fusion.

42. The power device according to claim 33, wherein the base body is provided with a wiring hole, the wiring hole is communicated with the accommodating space, the motor further comprises a sealing plug, a connecting line passes through the sealing plug to be electrically connected with the motor, and the sealing plug seals the wiring hole.

43. The power device of claim 33, wherein the base defines a first connecting hole extending through the first connecting member and the housing, and the stator defines a second connecting hole aligned with the first connecting hole to allow a fastener to pass through the first connecting hole and the second connecting hole to fixedly connect the stator to the housing.

44. The power device according to claim 43, wherein the base further comprises a positioning protrusion protruding from the base body into the accommodating space, the first connecting hole penetrates through the positioning protrusion, a positioning recess is formed in the stator, the second connecting hole is formed at the bottom of the positioning recess, and the positioning protrusion extends into the positioning recess.

45. The power device according to claim 33, wherein the base is provided with an avoiding hole, one end of the avoiding hole is communicated with the accommodating space, the other end of the avoiding hole is sealed by the first connecting piece, and the stator at least partially extends into the avoiding hole.

46. The power device according to claim 33, wherein the base is provided with an avoiding hole, one end of the avoiding hole is communicated with the accommodating space, the other end of the avoiding hole penetrates through the first connecting piece, the base further comprises a sealing member, and the sealing member is arranged in the avoiding hole and seals the end of the avoiding hole away from the stator.

47. The power unit of claim 33, wherein the base defines a lightening hole, one end of the lightening hole is in communication with the receiving space, and the other end of the lightening hole is sealed by the first connector.

48. The power device according to claim 25, wherein the stator includes a connecting portion and a winding portion, the winding portion is connected to an outer periphery of the connecting portion, a shaft hole is formed in the connecting portion, the rotor further includes a rotating shaft, the motor further includes a bearing, the bearing is disposed in the shaft hole, the rotating shaft penetrates through the second cover, the first cover and the bearing, and the rotating shaft is rotatably connected to the connecting portion through the bearing.

49. An unmanned aerial vehicle is characterized by comprising a fuselage, a horn and a power device, wherein the horn is connected to the fuselage, and the power device is arranged on the horn;

the power device comprises a motor and a blade, the blade is connected with the motor, and the motor can drive the blade to rotate;

the motor includes base, stator and rotor, the rotor cover is established on the base and form accommodating space, stator fixed connection just is located on the base in the accommodating space, the rotor can for the base reaches the stator rotates, the rotor includes:

the first cover body comprises a top wall and a side wall, the side wall is connected to the outer edge of the top wall, a through hole is formed in the side wall, and the through hole is communicated with the accommodating space and the outside; and

the second cover body comprises a base body and a centrifugal piece, the base body is connected to the top wall, the centrifugal piece is connected to the base body, and airflow passing through the through hole is generated when the centrifugal piece rotates, so that the accommodating space is subjected to gas exchange with the outside.

50. The UAV of claim 49 wherein the first cover comprises a metallic material; and/or

The second cover body comprises a plastic material.

51. The UAV of claim 49 wherein the top wall includes a plurality of spaced ribs and the centrifuge includes a plurality of centrifuge blades, the centrifuge blades being positioned between adjacent ribs.

52. The unmanned aerial vehicle of any one of claims 49-51, wherein the first cover further comprises a connecting protrusion connected to the top wall, the base body defines a connecting through hole, and the connecting protrusion extends into the connecting through hole and is engaged with the connecting through hole.

53. The UAV of claim 52, wherein the rotor is fixedly connected to the blades through a paddle clip, and the connecting protrusion has a fixing hole formed thereon to allow a fastener to penetrate through the paddle clip and the fixing hole and fixedly connect the paddle clip to the rotor.

54. The unmanned aerial vehicle of any one of claims 49-51, wherein the rotor is fixedly connected to the blades via a paddle clip, the base has an avoidance slot, the avoidance slot and the centrifugal piece are located on opposite sides of the base, and the avoidance slot is used for avoiding the paddle clip and/or the blades.

55. The UAV of any one of claims 49-51 wherein the rotor further comprises a yoke, the first cover further comprises fasteners attached to the side walls, the fasteners and the top wall being located at opposite ends of the side walls, respectively, the fasteners being configured to be fixedly attached to the yoke.

56. The UAV of claim 55 wherein the yoke is annular and the fasteners are interference fit with the yoke, the fasteners being at least partially embedded in the yoke.

57. The UAV of claim 49 wherein the base comprises a base body and a first connecting member, the base body and the first connecting member are integrally formed, the first connecting member and the receiving space are located on opposite sides of the base body, and the first connecting member is configured to connect to the horn.

58. The UAV of claim 57 wherein the motor further comprises a second connector removably coupled to the first connector, the first connector coupled to the second connector and configured to be commonly secured to the horn.

59. The UAV of claim 58 wherein the first connector is formed with a first notch and the second connector is formed with a second notch, the first notch opposing the second notch to allow the horn to extend into the first and second notches.

60. The UAV of claim 58, wherein the first connector defines a first locking hole, the second connector defines a second locking hole, the first locking hole is aligned with the second locking hole, and a locking member passes through the first locking hole and the second locking hole and locks the first connector and the second connector, such that the first connector and the second connector clamp the horn together.

61. The UAV of claim 58 wherein the motor further comprises a carrier connected to the second connector, the carrier and the first connector being on opposite sides of the second connector, the carrier configured to mount a sensor.

62. The UAV of claim 61 wherein the sensors comprise one or more of a distance sensor, an image sensor, a position sensor, an inertial measurement unit, a pressure sensor.

63. The UAV of claim 61 wherein the carrier is configured to support the UAV.

64. The unmanned aerial vehicle of claim 57, wherein the base body defines heat dissipation apertures, the base further comprises a filter screen, the filter screen is connected to the base, the filter screen covers the heat dissipation apertures, and the apertures of the filter screen are smaller than the apertures of the heat dissipation apertures.

65. The UAV of claim 64 wherein the base and the first connector comprise a plastic material and the filter mesh comprises a metal material, the metal material being secured to the plastic material by heat staking.

66. The unmanned aerial vehicle of claim 57, wherein the base body defines a wiring hole, the wiring hole is communicated with the accommodating space, the motor further comprises a sealing plug, a connecting line passes through the sealing plug to be electrically connected with the motor, and the sealing plug seals the wiring hole.

67. The UAV of claim 57 wherein the base defines a first connection hole extending through the first connector and the base, and the stator defines a second connection hole aligned with the first connection hole to allow a fastener to pass through the first connection hole and the second connection hole to fixedly connect the stator to the base.

68. The unmanned aerial vehicle of claim 67, wherein the base further comprises a positioning protrusion protruding from the base body into the accommodating space, the first connecting hole penetrates through the positioning protrusion, a positioning recess is formed in the stator, the second connecting hole is formed in the bottom of the positioning recess, and the positioning protrusion extends into the positioning recess.

69. The unmanned aerial vehicle of claim 57, wherein the base defines an escape aperture, one end of the escape aperture being in communication with the receiving space, the other end of the escape aperture being sealed by the first connector, the stator extending at least partially into the escape aperture.

70. The unmanned aerial vehicle of claim 57, wherein the base defines an avoidance hole, one end of the avoidance hole communicates with the accommodating space, the other end of the avoidance hole penetrates through the first connecting member, the base further comprises a sealing member, and the sealing member is disposed in the avoidance hole and seals an end of the avoidance hole away from the stator.

71. The unmanned aerial vehicle of claim 57, wherein the base defines a lightening hole, one end of the lightening hole being in communication with the receiving space, the other end of the lightening hole being sealed by the first connector.

72. The unmanned aerial vehicle of claim 49, wherein the stator comprises a connecting portion and a winding portion, the winding portion is connected to an outer periphery of the connecting portion, a shaft hole is formed in the connecting portion, the rotor further comprises a rotating shaft, the motor further comprises a bearing, the bearing is arranged in the shaft hole, the rotating shaft penetrates through the second cover body, the first cover body and the bearing, and the rotating shaft is rotatably connected with the connecting portion through the bearing.

Technical Field

The application relates to the technical field of driving devices, in particular to a motor, a power device and an unmanned aerial vehicle.

Background

The motor can mechanical energy and widely use in multiple fields by the conversion of electric energy, and the motor is provided with the coil usually, produces the magnetic field through the current of applying the change on the coil, and the rotor of motor rotates under the effect of magnetic field power, however, elements such as coil also can produce more heat at the during operation, and the heat if can not distribute away in time, will lead to the inside high temperature of motor, influences the normal use of motor.

Disclosure of Invention

The embodiment of the application provides a motor, a power device and an unmanned aerial vehicle.

The motor comprises a base, a stator and a rotor, wherein the rotor covers the base and forms an accommodating space, the stator is fixedly connected to the base and is located in the accommodating space, the rotor can rotate relative to the base and the stator, the rotor comprises a first cover body and a second cover body, the first cover body comprises a top wall and a side wall, the side wall is connected to the outer edge of the top wall, a through hole is formed in the side wall, and the through hole is communicated with the accommodating space and the outside; the second cover body comprises a base body and a centrifugal piece, the base body is connected to the top wall, the centrifugal piece is connected to the base body, and airflow passing through the through hole is generated when the centrifugal piece rotates, so that the accommodating space and the outside are subjected to gas exchange.

The power device comprises a motor and a paddle, wherein the paddle is connected with the motor, and the motor can drive the paddle to rotate; the motor comprises a base, a stator and a rotor, wherein the rotor covers the base and forms an accommodating space, the stator is fixedly connected to the base and is positioned in the accommodating space, and the rotor can rotate relative to the base and the stator; the rotor comprises a first cover body and a second cover body, the first cover body comprises a top wall and a side wall, the side wall is connected to the outer edge of the top wall, a through hole is formed in the side wall, and the through hole is communicated with the accommodating space and the outside; the second cover body comprises a base body and a centrifugal piece, the base body is connected to the top wall, the centrifugal piece is connected to the base body, and airflow passing through the through hole is generated when the centrifugal piece rotates, so that the accommodating space and the outside are subjected to gas exchange.

The unmanned aerial vehicle comprises a body, a horn and a power device, wherein the horn is connected to the body, and the power device is arranged on the horn; the power device comprises a motor and a blade, the blade is connected with the motor, and the motor can drive the blade to rotate; the motor comprises a base, a stator and a rotor, wherein the rotor covers the base and forms an accommodating space, the stator is fixedly connected to the base and is positioned in the accommodating space, and the rotor can rotate relative to the base and the stator; the rotor comprises a first cover body and a second cover body, the first cover body comprises a top wall and a side wall, the side wall is connected to the outer edge of the top wall, a through hole is formed in the side wall, and the through hole is communicated with the accommodating space and the outside; the second cover body comprises a base body and a centrifugal piece, the base body is connected to the top wall, the centrifugal piece is connected to the base body, and airflow passing through the through hole is generated when the centrifugal piece rotates, so that the accommodating space and the outside are subjected to gas exchange.

In the motor, power device and unmanned vehicles of this application embodiment, the second lid of rotor includes centrifugal piece, and centrifugal piece can produce the air current through the through-hole when rotating to make accommodating space and the external world carry out gas exchange, the heat in the accommodating space can be taken away in time by the air, makes the inside temperature of motor be unlikely to too high, guarantees the normal use of motor.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments of the present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural diagram of an unmanned aerial vehicle according to an embodiment of the present application;

FIG. 2 is a perspective assembly view of a motor, paddle clamp and support member according to an embodiment of the present disclosure;

FIG. 3 is an exploded perspective view of a motor, paddle clamp and support member according to an embodiment of the present disclosure;

fig. 4 is a perspective assembly view of a motor according to an embodiment of the present application;

fig. 5 is a perspective assembly view of a motor according to an embodiment of the present application;

fig. 6 is a schematic cross-sectional view of a motor according to an embodiment of the present application;

fig. 7 to 9 are exploded perspective views of a motor according to an embodiment of the present application;

fig. 10 is an exploded perspective view of a part of the elements of the motor according to the embodiment of the present application;

FIG. 11 is an enlarged schematic view of section XI of the motor shown in FIG. 6;

fig. 12 is an exploded perspective view of a part of the elements of the motor according to the embodiment of the present application;

fig. 13 is a perspective exploded view schematically showing a part of elements of the motor according to the embodiment of the present application.

Detailed Description

Embodiments of the present application will be further described below with reference to the accompanying drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.

In addition, the embodiments of the present application described below in conjunction with the accompanying drawings are exemplary and are only for the purpose of explaining the embodiments of the present application, and are not to be construed as limiting the present application.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1, an unmanned aerial vehicle 1000 according to an embodiment of the present disclosure includes a fuselage 2000, a horn 3000, and a power plant 4000. Unmanned aerial vehicle 1000 may be a multi-rotor unmanned aerial vehicle such as, without limitation, a quad-rotor unmanned aerial vehicle, an eight-rotor unmanned aerial vehicle, a twelve-rotor unmanned aerial vehicle, a sixteen-rotor unmanned aerial vehicle, or the like. The unmanned aerial vehicle 1000 may carry a load to perform different tasks, such as carrying an imaging device to perform photography, carrying an illumination device to perform light supplement, carrying a distance measuring device to perform distance measurement, carrying a spraying device to perform fertilization, and the like.

The fuselage 2000 can be used as a carrier of a power module, a flight control module, a pan-tilt and the like of the unmanned aerial vehicle 1000, and a load can also be installed on the fuselage 2000. The horn 3000 may also be mounted to the body 2000, for example, a plurality of horns 3000 may be mounted radially to the body 2000, in one example, the horn 3000 may be fixedly attached to the body 2000, and in another example, the horn 3000 may be foldable relative to the body 2000.

The power device 4000 is mounted on the horn 3000, for example, the power device 4000 may be mounted on an end of the horn 3000 away from the fuselage 2000, and the power device 4000 may provide flying power for the unmanned aerial vehicle 1000 when operating. One power device 4000 may be mounted on one horn 3000, and a plurality of power devices 4000 may be mounted on one horn 3000, which is not limited herein.

Referring to fig. 1 to 3, the power device 4000 includes a motor 100, a paddle 200, and a paddle holder 300. Motor 100 is connected on horn 3000, and paddle 200 passes through paddle clamp 300 fixed connection on motor 100's rotor 20, and motor 100's rotor 20 rotates in order to drive paddle clamp 300 and paddle 200 and rotate, and paddle 200 rotates in order to produce lift and thrust, drives unmanned vehicles 1000 motion. The paddle clip 300 connects the paddle 200 to the motor 100, and the paddle clip 300 and the paddle 200 may be detachably connected, which is not limited herein. The motor 100 is mounted on the supporting member 3000, and the supporting member 3000 may be any component that can be used to carry the motor 100, and the supporting member 3000 is exemplified as the horn 3000 in the present specification.

Referring to fig. 4 to 7, specifically, the motor 100 includes a base 10, a stator 30 and a rotor 20. The rotor 20 is covered on the base 10, and the rotor 20 and the base 10 together form a housing space 15. The stator 30 is fixedly connected to the base 10 and positioned in the housing space 15, and the rotor 20 is rotatable with respect to the base 10 and the stator 30.

Referring to fig. 7 to 10, the base 10 may be used to connect with the supporting member 3000, and the rotor 20 and the stator 30 may be carried on the base 10. The base 10 includes a base body 11 and a first connecting member 12, wherein the base body 11 and the first connecting member 12 are integrally formed, or the base body 11 and the first connecting member 12 are an integral structure. The base 10 can be made of plastic and other materials by an integral molding process, for example, by injection molding, and the base 11 and the first connecting member 12 do not need to be fixed by an additional locking structure, and the relative position relationship between the base 11 and the first connecting member 12 is stable and is not easy to shift.

The first connecting element 12 and the accommodating space 15 are located on two opposite sides of the seat 11. The first connecting member 12 is used to connect with the supporting member 3000, specifically, the first connecting member 12 can be separately and fixedly connected with the supporting member 3000 to fix the motor 100 on the supporting member 3000, or the first connecting member 12 can be cooperated with other structures to fix the motor 100 on the supporting member 3000.

In the example shown in fig. 2 and 3, the motor 100 further includes a second connecting member 13, the second connecting member 13 is detachably connected to the first connecting member 12, and the first connecting member 12 is connected to the second connecting member 13 and is configured to be fixed to the supporting member 3000 together. The second connecting member 13 may also be made of plastic or other materials, so as to reduce the quality of the motor 100 and improve the endurance of the unmanned aerial vehicle 1000. The first connecting member 12 and the second connecting member 13 can be detachably connected by a snap connection, a screw connection, a welding, an adhesion, etc., in the example shown in the drawings of the present application, the first connecting member 12 has a first locking hole 122 (as shown in fig. 5), the second connecting member 13 has a second locking hole (not shown), the first locking hole 122 is aligned with the second locking hole, and the locking member 400 passes through the first locking hole 122 and the second locking hole and locks the first connecting member 12 and the second connecting member 13, so that the first connecting member 12 and the second connecting member 13 commonly clamp the supporting member 3000. The locking member 400 may be a screw, and when the first connecting member 12 and the second connecting member 13 are mounted, the locking member 400 may sequentially pass through the second locking hole and the first locking hole 122 to fix the first connecting member 12 and the second connecting member 13, and when the first connecting member 12 and the second connecting member 13 are detached, the locking member 400 may be taken out to release the fixed connection state of the first connecting member 12 and the second connecting member 13, so that the user can conveniently detach the first connecting member 12 and the second connecting member 13.

With reference to fig. 2 and fig. 3, the first connecting element 12 and the second connecting element 13 are fixed on the supporting element 3000 in the following manner: the first connecting member 12 is formed with a first notch 121, the second connecting member 13 is formed with a second notch 131, and the first notch 121 is opposite to the second notch 131 to allow the supporting member 3000 to extend into the first notch 121 and the second notch 131. When installing first connecting piece 12 and second connecting piece 13, it is relative with first breach 121 and second breach 131, the shape in the space that first breach 121 and second breach 131 formed jointly can be close with support piece 3000 horizontal shape, support piece 3000 stretches into among first breach 121 and the second breach 131, rethread locking piece 400 locks first connecting piece 12 and second connecting piece 13 for first connecting piece 12 and the common centre gripping support piece 3000 of second connecting piece 13, support piece 3000, first connecting piece 12 and second connecting piece 13 can fixed connection.

Further, with reference to fig. 2 and fig. 3, the motor 100 may further include a carrier 14, the carrier 14 is connected to the second connecting member 13, and the carrier 14 and the first connecting member 12 are located on two opposite sides of the second connecting member 13. The carrier 14 may be used to carry functional elements that may extend the functionality of the unmanned aerial vehicle 1000, for example, the carrier 14 may be used to mount functional elements such as sensors, sprinklers, lights, etc., without limitation. In one example, the carrier 14 is used for mounting sensors, which may be one or more of a distance sensor, such as a microwave radar, a laser radar, etc., an image sensor, such as an imaging device, an infrared imaging device, a two-camera, a three-camera, etc., a position sensor, such as a GPS sensor, an RTK sensor, etc., an inertial measurement unit, such as a gyroscope, a speed sensor, etc., and a pressure sensor, such as a barometer, etc. The sensor mounted on the bearing part 14 can be used for providing data bases for positioning, obstacle avoidance, speed measurement, shooting and the like for the unmanned aerial vehicle 1000, and the sensor does not need to be mounted on the airframe 2000, so that the mounting space on the airframe 2000 is saved. Specifically, the carrier 14 is provided with a mounting portion 141, and the mounting portion 141 may be used to provide a mounting space for the sensor. In addition, the carrier 14 may also be used to support the unmanned aerial vehicle 1000, and when the unmanned aerial vehicle 1000 lands on the ground, the carrier 14 is supported on the ground, and the unmanned aerial vehicle 1000 is supported by the plurality of carriers 14 together, so as to avoid landing of the fuselage 2000 of the unmanned aerial vehicle 1000.

The base body 11 is used for being fixedly connected with the stator 30. Specifically, referring to the examples shown in fig. 10 to 12, the base 10 is provided with a first connection hole 17, and the first connection hole 17 penetrates through the first connection element 12 and the base 11. Meanwhile, the stator 30 is provided with a second connection hole 31, and the second connection hole 31 is aligned with the first connection hole 17 to allow the fastener 600 to penetrate through the first connection hole 17 and the second connection hole 31 to fixedly connect the stator 30 and the base 11. The fastening member 600 may be a screw, and the first connection hole 17 and the second connection hole 31 may be threaded holes, and when mounting, the stator 30 may be close to the base body 11, so that the second connection hole 31 is aligned with the first connection hole 17, and then the fastening member 600 passes through the first connection hole 17 and the base body 12, and then the fastening member 600 passes through the second connection hole 31 to connect the stator 30. When disassembly is required, the fastener 600 can be taken out from the outside of the motor 100, so that disassembly is convenient. Further, the base 10 further includes a positioning protrusion 113, the positioning protrusion 113 protrudes from the base body 11 to the accommodating space 15, and the first connection hole 17 penetrates through the positioning protrusion 113. The stator 30 is formed with a positioning recess 32, the second connection hole 31 is opened at the bottom of the positioning recess 32, and the positioning protrusion 113 extends into the positioning recess 32. When the stator 30 is mounted on the housing 11, the positioning protrusion 113 is engaged with the positioning recess 32, so that the relative position between the housing 11 and the stator 30 is easily fixed, and the first connection hole 17 is aligned with the second connection hole 31. The number of the positioning protrusions 113 and the number of the positioning recesses 32 may be equal, and the number of the positioning protrusions 113 and the number of the positioning recesses 32 may be multiple and matched in a one-to-one correspondence manner. Of course, in another embodiment, a positioning recess may be formed on the seat body 11, the first connecting hole is formed at the bottom of the positioning recess, the positioning protrusion is formed on the stator 30, the second connecting hole is formed on the positioning protrusion, and the positioning protrusion is engaged with the positioning recess, which is not limited herein.

The base 10 may also be provided with openings for performing different functions. For example, referring to fig. 10, a lightening hole 115 is formed on the base 10, one end of the lightening hole 115 is communicated with the accommodating space 15, and the other end of the lightening hole 115 is sealed by the first connecting member 12. The lightening holes 115 are formed, so that the material and cost of the base 10 can be saved, the weight of the base 10 is reduced, the endurance of the unmanned aerial vehicle 1000 carrying the motor 100 is prolonged, in addition, the other ends of the lightening holes 115 are sealed by the first connecting piece 12, and dust, water vapor and the like are prevented from entering the accommodating space 15 from the lightening holes 115. The lightening hole 115 may penetrate through the seat body 11 and penetrate into the first connecting member 12, or may not penetrate through the seat body 11, which is not limited herein. The number of the lightening holes 115 can be one or more, and a plurality of lightening holes 115 can be arranged at intervals.

For another example, referring to fig. 6, 9 and 10, the seat body 11 may be provided with a wire hole 112, and the wire hole 112 is communicated with the accommodating space 15. The motor 100 further comprises a sealing plug 40, the connection line 60 passes through the sealing plug 40 to be electrically connected with the motor 100, and the sealing plug 40 seals the wiring hole 112. The additional wiring hole 112 is provided for the connection line 60 to pass through to electrically connect the motor 100 with external equipment, for example, to connect the motor 100 with an electronic governor, the connection line 60 passes through the sealing plug 40, and the sealing plug 40 seals the wiring hole 112, so as to prevent dust or moisture from entering the accommodating space 15 from the wiring hole 112. The sealing plug 40 may be a rubber plug that is easily inserted into the wire hole 112 or removed from the wire hole 112. The sealing plug 40 may be made of a material that is easily elastically deformed, for example, the sealing plug 40 may be made of rubber, silicone, or the like, so as to improve the sealing property when sealing the wire hole 112. The support 3000 may be a hollow structure, and the connection line 60 may further extend inside the support 3000.

For another example, referring to fig. 10 and 11, the seat 11 may be formed with an avoiding hole 114, one end of the avoiding hole 114 is communicated with the accommodating space 15, the other end of the avoiding hole 114 is sealed by the first connecting member 12, and the stator 30 at least partially extends into the avoiding hole 114. The seat body 11 is provided with the avoidance hole 114, and at least part of the stator 30 extends into the avoidance hole 114, so that the stator 30 is closer to the seat body 11, the overall size of the motor 100 is reduced, and the weight of the base 10 can be reduced by providing the avoidance hole 114. The other end of the avoiding hole 114 is sealed by the first connecting member 12, and a sealing cover for preventing dust or water from entering is not required to be additionally arranged, so that the structure of the motor 100 is simplified and a better sealing effect can be achieved. The avoiding hole 114 may penetrate into the first connecting member 12, and the avoiding hole 114 may be formed only on the seat body 11, which is not limited herein. In addition, as shown in fig. 11, the base 10 may further include a sealing member 18, and the sealing member 18 is disposed in the avoidance hole 114 and seals an end of the avoidance hole 114 away from the stator 30. The sealing member 18 may specifically be a PC (polycarbonate) sheet.

For another example, referring to fig. 7 and 9, the base 11 is provided with a heat dissipation hole 111. The heat dissipation holes 111 are communicated with the accommodating space 15, and air in the accommodating space 15 can flow into the outside through the heat dissipation holes 111 to take away heat generated during the operation of the motor 100 and reduce the temperature of the motor 100. Further, base 10 still can include filter screen 16, and filter screen 16 connects on base 10, and filter screen 16 covers louvre 111, and the aperture of filter hole 161 of filter screen 16 is less than louvre 111's aperture, through setting up filter screen 16, improves motor 100's waterproof dustproof ability, for example makes motor 100's structure satisfy IP44 protection level, can adapt to more complicated operational environment. Specifically, the base 11 and the first connecting member 12 may include a plastic material, the filter screen 16 includes a metal material, and the filter screen 16 including the metal material may be fixed on the base 11 including the plastic material in a hot melting manner, so that the connection manner between the filter screen 16 and the base 11 is reliable, and an additional adhesive for connecting the filter screen 16 and the base 11 is not required, thereby reducing the structural complexity of the motor 100, and meanwhile, for the metal material, the weight of the base 11 and the first connecting member 12 made of the plastic material is lighter, and the weight of the motor 100 is reduced.

Referring to fig. 8, 12 and 13, the stator 30 is fixedly connected to the base 11, and the stator 30 is accommodated in the accommodating space 15. The stator 30 includes a connection portion 33 and a winding portion 34. The connecting portion 33 and the winding portion 34 may be integrally formed, and the connecting portion 33 and the winding portion 34 may be made of a metal material. The connecting portion 33 is for rotational connection with the rotor 20. Specifically, the connecting portion 33 may be cylindrical, and a shaft hole 331 may be formed in the connecting portion 33. The rotating shaft 24 of the rotor 20 can penetrate into the shaft hole 331 to be further rotatably connected with the connecting portion 33, for example, the motor 100 further includes a bearing 50, the bearing 50 is disposed in the shaft hole 331, an outer ring of the bearing 50 is fixedly connected with the connecting portion 33, an inner ring of the bearing 50 is fixedly connected with the rotating shaft 24, and the rotating shaft 24 and the inner ring rotate relative to the connecting portion 33 and the outer ring. The number of the bearings 50 may be one or more, in the embodiment of the present application, the number of the bearings 50 is two, two bearings 50 are coaxially disposed, and the rotating shaft 24 sequentially passes through the two bearings 50 to be rotatably connected with the connecting portion 33.

Referring to fig. 12 and 13, the winding portion 34 is connected to an outer periphery of the connecting portion 33. The coil 34 may be wound with a coil, and the coil may generate a magnetic field after being energized, and the magnitude and direction of the magnetic field may be changed by controlling a change in current or voltage, and the rotor 20 may be driven to rotate relative to the stator 30 by an interaction between the magnetic field generated by the coil and the magnetic field of the rotor 20 itself. One end of the winding portion 34 close to the seat body 11 may be provided with the positioning recess 32 and the second connecting hole 31.

Referring to fig. 7 to 9, the rotor 20 is covered on the base 11, the rotor 20 and the base 11 together form the receiving space 15, and the rotor 20 can rotate relative to the base 10 and the stator 30. As shown in fig. 2 and 3, the blade 200 is fixedly connected to the rotor 20 through the blade clamp 300, the rotor 20 can drive the blade 200 to rotate synchronously, and the rotation parameters of the blade 200 can be controlled by controlling the rotation parameters of the rotor 20.

The rotor 20 includes a rotating shaft 24, a first cover 21, a second cover 22, and a yoke 23. The rotating shaft 24 penetrates through the first cover 21, the second cover 22, the bearing 50 and the shaft hole 331. As shown in fig. 11 to 13, the rotor 20 further includes a locking member 25, and the locking member 25 is connected to the rotating shaft 24 and used for limiting the axial position of the bearing 50. Along the axial direction of the rotating shaft 24, at least a first cover 21, a bearing 50, another bearing 50, and a locking member 25 may be sequentially disposed, the first cover 21 abuts against an inner ring of the bearing 50, and the locking member 25 is fixed on the rotating shaft 24 and is configured to abut against an inner ring of the another bearing 50. Further, in an example, a spacer 26 may be further disposed between the locking member 25 and the other bearing 50, and two sides of the spacer 26 are respectively supported by the inner ring of the other bearing 50 and the locking member 25, so as to compensate a gap between the locking member 25 and the inner ring.

Referring to fig. 7 to 9, the first cover 21 and the second cover 22 are inserted through the shaft 24. Specifically, in the present embodiment, the first cover 21 includes a top wall 211 and a side wall 212. The side wall 212 is connected to the outer edge of the top wall 211. The sidewall 212 is provided with a through hole 213, the through hole 213 communicates the accommodating space 15 with the outside, air in the accommodating space 15 can enter the outside through the through hole 213, and outside air can also enter the accommodating space 15 through the through hole 213. The top wall 211 may specifically include a plurality of reinforcing ribs 2111 arranged at intervals, one end of each of the plurality of reinforcing ribs 2111 may be connected to the side wall 212, and the other end of each of the plurality of reinforcing ribs 2111 is connected to the middle of the top wall 211, so that the plurality of reinforcing ribs 2111 are distributed in a spoke shape, and the plurality of reinforcing ribs 2111 are arranged to enable the first cover 21 to have higher strength, save material of the first cover 21, and reduce the weight of the first cover 21. The sidewall 212 may have a circular ring shape as a whole, and the through hole 213 of the sidewall 212 may have a slit shape, so that air is easily flowed through the through hole 213, and dust, water droplets, and the like are not easily introduced into the accommodating space 15 through the through hole 213.

Referring to fig. 7 to 9, the second cover 22 is combined with the first cover 21, for example, the second cover 22 may be detachably connected to the first cover 21, and two sides of the second cover 22 may be respectively clamped by the first cover 21 and the paddle clip 300, so that the first cover 21, the second cover 22, the paddle clip 300, and the paddle 200 rotate synchronously. The second cover 22 includes a base 221 and a centrifugal member 222. The base 221 is connected to the top wall 211, the base 221 may have a flat plate shape, the base 221 may have a circular shape as a whole, and the first cover 21 and the second cover 22 may be fixedly connected by screws 70. Centrifugal piece 222 is connected on base 221, and centrifugal piece 222 is rotating in order to produce the air current that passes through-hole 213 to make accommodating space 15 and the external world carry out gas exchange, and like this, when motor 100 during operation, rotor 20 is driving oar clamp 300 and paddle 200 and is rotating, and pivoted centrifugal piece 222 can also promote accommodating space 15 and the external world and carry out gas exchange, realizes the initiative heat dissipation of motor 100, improves the radiating efficiency of motor 100. Specifically, the centrifugal member 222 may be in the form of centrifugal blades, the centrifugal blades are located between the adjacent ribs 2111, no interference is generated between the centrifugal member 222 and the top wall 211, and the centrifugal member 222 can drive the air flow in the accommodating space 15 when rotating. In addition, compared with the integrated cover body, the split cover body composed of the first cover body 21 and the second cover body 22 can be assembled conveniently, and meanwhile, the processing cost is reduced, and the split cover body is more favorable for transportation and storage.

In addition, the first cover 21 is made of a metal material, or the first cover 21 may include a metal material, for example, iron, stainless steel, copper, etc., so that the strength of the first cover 21 is high, the bending moment resistance of the first cover 21 is improved, and the first cover 21 is not easily deformed. Meanwhile, the first cover 21 has good heat conductivity, and heat in the accommodating space 15 can be quickly conducted out through the first cover 21. Second lid 22 can be made by the plastic material, or second lid 22 can include the plastic material, and second lid 22 can be through the mode integrated into one piece that moulds plastics, adopts the second lid 22 of plastic material for the whole weight of motor 100 is lighter, improves unmanned vehicles 1000's duration. Meanwhile, the split type cover body formed by the first cover body 21 and the second cover body 22 made of different materials is more convenient to machine and form.

Further, referring to fig. 3, fig. 7 and fig. 8, the first cover 21 may further include a connecting protrusion 214 connected to the top wall 211, and the base 221 is provided with a connecting through hole 2211. The connecting protrusion 214 extends into the connecting through-hole 2211 and is engaged with the connecting through-hole 2211. The connecting protrusion 214 may be used to rotate with the rotating member, such as the blade holder 300 and the blade 200 when the rotor 20 is used to rotate the blade 200. The shapes of the connecting projection 214 and the connecting through hole 2211 may be adapted to each other, so that a user can position the mounting angles of the first cover 21 and the second cover 22 when mounting the two. The rotating shaft 24 can penetrate through the connecting protrusion 214 and the connecting through hole 2211 and is connected with the paddle clamp 300. In particular, the paddle clip 300 and the paddle 200 may be removably attached, or both may be integrally formed.

The connecting protrusion 214 may have a fixing hole 2141 formed thereon to allow the locking member 500 to pass through the rotating member and the fixing hole 2141, and to fixedly connect the rotating member and the rotor 20. When the rotor 20 is used to be rotatably connected to the paddle holder 300, the locking member 500 penetrates through the paddle holder 300 and the fixing hole 2141, so as to fixedly connect the paddle holder 300 to the rotor 20. The paddle clip 300 can be held against one side of the base 221 and the top wall 211 can be held against the other side of the base 221 to prevent the second cover 22 from moving. Furthermore, the base 221 may be provided with an avoiding groove 2212, the avoiding groove 2212 and the centrifugal piece 222 are located on two opposite sides of the base 221, and the avoiding groove 2212 is used for avoiding the rotating piece (the paddle clip 300). The specific shape of the avoiding groove 2212 may be set according to the specific shape of the paddle clip 300, and the paddle clip 300 may partially extend into the avoiding groove 2212, or the paddle 200 may at least partially extend into the avoiding groove 2212, so as to reduce the distance between the paddle clip 300 and the second cover 22, and reduce the overall thickness of the paddle clip 300 after being matched with the second cover 22.

Referring to fig. 7 and 8, the yoke 23 surrounds the stator 30, and the yoke 23 may be connected with a magnet, a magnetic field generated by the magnet interacts with a magnetic field generated by the coil, and the magnet drives the yoke 23, the first cover 21, the second cover 22, and the rotating shaft 24 to rotate under the action of the magnetic field. The yoke 23 is connected to the first cover 21, specifically, the first cover 21 includes a fixing member 215 connected to the side wall 212, the fixing member 215 and the top wall 211 are respectively located at two opposite ends of the side wall 212, and the fixing member 215 is configured to be fixedly connected to the yoke 23. The fixing member 215 may include a plurality of fixing teeth spaced apart from each other, and when the yoke 23 is connected to the fixing member 215, the yoke 23 may shield the fixing teeth and cover a portion of the sidewall 212, so that the rotor 20 has a complete and beautiful appearance. More specifically, the yoke 23 has a ring shape, the fixing member 215 is fitted to the yoke 23 by interference fit, and the fixing member 215 is at least partially embedded in the yoke 23. Through interference fit's mode cooperation, need not set up fixing device fixed yoke 23 and first lid 21 again additionally, reduce the total weight of rotor 20.

In summary, in the motor 100, the power device 4000 and the unmanned aerial vehicle 1000 according to the embodiment of the present application, the second cover 22 of the rotor 20 includes the centrifugal piece 222, and the centrifugal piece 222 can generate an airflow passing through the through hole 213 when rotating, so that the accommodating space 15 exchanges air with the outside, and heat in the accommodating space 15 can be timely taken away by air, so that the temperature inside the motor 100 is not too high, and normal use of the motor 100 is ensured.

In the description herein, reference to the description of the terms "certain embodiments," "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art within the scope of the present application, which is defined by the claims and their equivalents.