Unmanned aerial vehicle motor and unmanned aerial vehicle

Abstract

The utility model discloses an unmanned aerial vehicle motor and an unmanned aerial vehicle, the unmanned aerial vehicle motor comprises a stator assembly and a rotor assembly, and the stator assembly comprises a stator seat and a winding; the rotor assembly comprises a rotating shell provided with a permanent magnet, and the center of the rotating shell is fixedly connected with the motor shaft; an annular plate is arranged at the lower end of the motor shaft, a composite bearing is arranged between the lower end of the motor shaft and the bottom end of the stator base, and the composite bearing is of an integrated combined structure of a thrust bearing and a radial bearing. According to the utility model, the problems that the service life of the motor of the unmanned aerial vehicle and the flight safety of the unmanned aerial vehicle are influenced because the motor of the unmanned aerial vehicle in the prior art cannot bear larger axial force are effectively solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of unmanned aerial vehicles, and in particular relates to a motor for unmanned aerial vehicles and a unmanned aerial vehicle. Background Art

[0002] Most drones in the prior art use ordinary motors as the rotor propeller drive motors of drones. However, the motor shafts of ordinary motors in the prior art can usually withstand large radial forces but cannot withstand large axial forces. The rotor propellers of drones will generate large axial forces on the motors through aerodynamic forces during rotation. Therefore, large axial forces will have a great impact on the service life and reliability of drone motors. When the axial tensile pressure generated by the rotor propellers is large, it may even cause the motor shaft to shift axially and the drone rotor propellers to fall off, which will seriously threaten the flight safety of the drone. Utility Model Content

[0003] The purpose of the utility model is to solve the problem that the UAV motor in the prior art cannot withstand a large axial force, thereby affecting the service life of the UAV motor and affecting the flight safety of the UAV, and to provide a UAV motor and a UAV, which have the advantages of compact motor structure, long service life, high reliability and good UAV flight safety.

[0004] The technical solution adopted by the utility model to solve the above technical problems is a motor for a drone, the motor comprising:

[0005] A stator assembly, the stator assembly comprising a stator seat and a winding;

[0006] A rotor assembly, the rotor assembly comprising a rotating housing provided with a permanent magnet, the center of the rotating housing being fixedly connected to the motor shaft;

[0007] An annular plate is provided at the lower end of the motor shaft, and a composite bearing is provided between the lower end of the motor shaft and the bottom end of the stator seat. The composite bearing is an integrated structure of a thrust bearing and a radial bearing.

[0008] Since the motor shaft of the UAV motor is subjected to a large axial force, the axial force causes the motor shaft to move upward. The lower end of the motor shaft of the utility model is provided with an annular plate, and the diameter of the annular plate is larger than the diameter of the motor shaft. The motor shaft of this structure can withstand a large axial force, which fundamentally avoids the occurrence of accidents such as axial displacement of the motor shaft and falling off of the UAV rotor blades that may occur in the UAV motor shaft of the prior art, and solves the problem that the UAV motor of the prior art cannot withstand a large axial force, thereby affecting the service life of the UAV motor and affecting the flight safety of the UAV. The utility model sets a composite bearing between the lower end of the motor shaft and the bottom end of the stator seat. The composite bearing is an integrated combination structure of a thrust bearing and a radial bearing, wherein the thrust bearing is used to withstand the axial force, and the radial bearing is used to withstand the radial force of the traditional motor. The integrated combination structure of the thrust bearing and the radial bearing has the characteristics of simple and compact structure, which is suitable for the application of UAVs.

[0009] Preferably, the thrust bearing is horizontally arranged between the annular plate and the stator seat, the radial bearing is located at the upper end surface of the thrust bearing, and the radial bearing is located between the motor shaft and the stator seat. The thrust bearing is horizontally arranged between the annular plate and the stator seat to bear the axial force; the radial bearing is located between the motor shaft and the stator seat to bear the radial force of the motor.

[0010] Preferably, an axial cavity is provided in the center of the stator seat, the annular plate and the composite bearing are both arranged in the axial cavity, and the thrust bearing and the radial bearing are both needle bearings; the bottom surface of the stator seat is provided with a motor mounting hole. The axial cavity is used to set the motor shaft, the annular plate and the composite bearing, so that the annular plate and the composite bearing at the lower end of the motor shaft are both located in the axial cavity, so that when the bottom surface of the stator seat is used as the fixed surface of the motor, it will not affect the rotation of the motor shaft. Since the thrust bearing and the radial bearing are both needle bearings, the axial thickness of the thrust bearing and the radial thickness of the radial bearing can be easily made smaller, thereby reducing the volume, which is suitable for the requirement of drones for small motor volume.

[0011] Preferably, the inner wall of the rotating shell is cylindrical, the permanent magnets are evenly distributed on the circumference of the inner wall of the rotating shell, ventilation and heat dissipation slots are provided between adjacent permanent magnets, and heat dissipation holes are provided on the top cover of the rotating shell. Providing ventilation and heat dissipation slots and heat dissipation holes is conducive to better heat dissipation of the motor.

[0012] Preferably, the windings are arranged on the stator core on the stator seat, the windings are evenly distributed in the circumferential direction of the stator core, and the number of the windings is less than the number of the permanent magnets.

[0013] Preferably, an axial hole is provided in the center of the top cover of the rotating housing, a sleeve extends from the bottom surface of the top cover at the axial hole, a screw hole for fixing the motor shaft is provided on the side wall of the sleeve, the longitudinal section of the motor shaft is in an inverted T shape, the upper end of the motor shaft is inserted into the axial hole, and the annular plate is integrally arranged at the lower end of the motor shaft. The longitudinal section of the motor shaft of this solution is in an inverted T shape, that is, the annular plate and the motor shaft are an integral structure, and the upper part of the motor shaft is fixed to the rotating housing through the screw hole on the top cover sleeve.

[0014] Preferably, an upper bearing is provided between the upper end of the motor shaft and the stator seat, the upper bearing being a radial bearing, and a screw for fixing the rotor propeller extends from the upper end of the motor shaft. In this solution, the upper end of the motor shaft extends out of the top cover of the rotating housing, and is fixed to the rotor propeller of the drone through the screw structure at the upper end of the motor shaft.

[0015] As another optional solution, a rotor propeller mounting plate is provided in the center of the top cover of the rotating housing, the motor shaft is an integral structure with the rotating housing and is located below the rotor propeller mounting plate, the lower end of the motor shaft is provided with an annular plate fixing hole, and the annular plate is fixed to the lower end of the motor shaft. The motor shaft of this solution is integrally arranged with the rotating housing, a rotor propeller mounting plate is formed in the top center of the rotating housing, and the rotor propeller is directly fixed to the rotor propeller mounting plate; the annular plate at the lower end of the motor shaft is separately arranged from the motor shaft, and is fixed to the motor shaft through the fixing hole at the lower end of the motor shaft.

[0016] Preferably, an upper bearing is provided between the upper end of the motor shaft and the stator seat, the upper bearing is a composite bearing, the composite bearing is an integrated structure of a thrust bearing and a radial bearing, the thrust bearing of the upper bearing is in close contact with the rotor blade mounting plate, and the radial bearing of the upper bearing is located between the motor shaft and the stator seat. The upper bearing on the upper part of the motor shaft of this solution adopts the same composite bearing as the lower end of the motor shaft, and the installation direction of the composite bearing is opposite to that of the composite bearing at the lower end of the motor shaft, and the thrust bearing in the composite bearing is in close contact with the rotor blade mounting plate on the rotating housing to ensure smooth rotation of the rotor blade mounting plate.

[0017] A drone, comprising a motor and a rotor propeller, wherein the motor is any one of the drone motors described above, and the rotor propeller is fixed to the motor shaft or rotating housing of the drone motor. There are two ways to fix the drone motor and the rotor propeller of the utility model, one is to directly fix the rotor propeller to the top of the rotating housing, and the other is to fix the rotor propeller to the motor shaft extending from the top of the rotating housing.

[0018] The beneficial effect of the utility model is that it effectively solves the problem that the UAV motor of the prior art cannot withstand a large axial force, thereby affecting the service life of the UAV motor and affecting the flight safety of the UAV. The UAV motor and UAV of the utility model have the advantages of compact motor structure, long service life, high reliability and good UAV flight safety, and have high practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural sectional view of Example 1 of the UAV motor of the utility model.

[0020] Figure 2 It is a three-dimensional exploded structural schematic diagram of the first embodiment of the motor of the UAV of the present utility model.

[0021] Figure 3 It is a three-dimensional structural schematic diagram of the rotating shell of the UAV motor embodiment 1 of the utility model.

[0022] Figure 4 This is a schematic diagram of the positional relationship between the motor shaft, the composite bearing and the upper bearing of Example 1 of the UAV motor of the utility model.

[0023] Figure 5 This is a structural sectional view of Example 2 of the UAV motor of the utility model.

[0024] Figure 6 This is a schematic diagram of the positional relationship between the windings and the permanent magnets of Example 2 of the UAV motor of the utility model.

[0025] Figure 7 It is a three-dimensional exploded structural schematic diagram of the second embodiment of the motor of the UAV of the present utility model.

[0026] Figure 8 The utility model is a schematic diagram of an assembly relationship between a motor and a rotor blade of a UAV.

[0027] In the figure: 1. stator seat, 2. winding, 3. permanent magnet, 4. rotating housing, 5. motor shaft, 6. annular plate, 7. composite bearing, 8. thrust bearing, 9. radial bearing, 10. shaft cavity, 11. ventilation and heat dissipation slot, 12. top cover, 13. heat dissipation hole, 14. stator core, 15. shaft hole, 16. sleeve, 17. screw hole, 18. upper bearing, 19. rotor blade, 20. screw, 21. rotor blade mounting plate, 22. annular plate fixing hole, 23. rotor blade fixing nut, 24. blade pad, 25. set screw, 26. spoke, 27. motor mounting hole, 28. annular plate fixing screw. DETAILED DESCRIPTION

[0028] The specific implementation of the technical solution of the utility model is further described below through examples and in conjunction with the accompanying drawings.

[0029] Example 1

[0030] Example 1

[0031] In such Figure 1 Figure 2 In the embodiment 1 shown, a motor for a drone includes: a stator assembly, which includes a stator seat 1 and a winding 2; a rotor assembly, which includes a rotating housing 4 provided with a permanent magnet 3, and the center of the rotating housing 4 is fixedly connected to the motor shaft 5. The winding 2 of this embodiment is arranged on the stator core 14 on the outer periphery of the stator seat 1, and the winding 2 is evenly distributed in the circumferential direction of the stator core 14, and the number of the winding 2 is less than the number of the permanent magnets 3; the number of the windings 2 in this embodiment is 12, and the number of the permanent magnets 3 is 14.

[0032] An annular plate 6 is provided at the lower end of the motor shaft 5, and a composite bearing 7 is provided between the lower end of the motor shaft 5 and the bottom end of the stator seat 1. The composite bearing 7 is an integrated structure of a thrust bearing 8 and a radial bearing 9. The thrust bearing 8 is horizontally arranged between the annular plate 6 and the stator seat 1 to bear the axial force; the radial bearing 9 is located between the motor shaft 5 and the stator seat 1 to bear the radial force of the motor. The thrust bearing 8 is horizontally arranged between the annular plate 6 and the stator seat 1, and the radial bearing 9 is located on the upper end surface of the thrust bearing 8. The radial bearing 9 is located between the motor shaft 5 and the stator seat 1. Both the thrust bearing 8 and the radial bearing 9 are needle bearings. Both the thrust bearing 8 and the radial bearing 9 are needle bearings, which can make the axial thickness of the thrust bearing 8 and the radial thickness of the radial bearing 9 easier to make smaller, thereby reducing the volume, which is suitable for the requirement of the drone for a small motor volume.

[0033] The bottom of the composite bearing 7 of this embodiment constitutes a thrust bearing 8 (see Figure 4), the thrust bearing 8 includes two upper and lower parallel circular plates, and radial needle rollers are arranged between the upper and lower circular plates. This structure can make the axial thickness of the thrust bearing 8 very thin, which is more suitable for occasions such as drones that have high requirements on the volume and weight of the motor; the upper part of the composite bearing 7 constitutes a radial bearing 9, and the radial bearing 9 includes two coaxially arranged cylinders arranged inside and outside, and needle rollers are arranged between the coaxially arranged cylinders. The length direction of the needle rollers is parallel to the length direction of the cylinders. This structure can also make the radial thickness of the radial bearing 9 very thin, which is beneficial to occasions such as drones that have high requirements on the volume and weight of the motor. When it is necessary to withstand a large radial force, it can be solved by increasing the length of the inner and outer cylinders and the needle rollers. Increasing the length of the inner and outer cylinders and the needle rollers usually does not have a significant impact on the volume of the motor; the composite bearing 7 of the utility model adopts an integrated combination structure of a thrust bearing 8 and a radial bearing 9, the length of the inner cylinder of the radial bearing 9 is greater than the length of the outer cylinder, the inner diameter of the annular plate on the thrust bearing 8 is greater than the inner diameter of the annular plate below, and the lower end of the inner cylinder of the radial bearing 9 is welded and fixed to the inner circle of the annular plate below the thrust bearing 8, and the lower end of the outer cylinder of the radial bearing 9 is welded and fixed to the inner circle of the annular plate above the thrust bearing 8 to form an integrated composite bearing 7. In this way, the composite bearing 7 limits the positional relationship between the stator seat 1 and the motor shaft 5 in both the axial and radial directions, which can improve accuracy and facilitate assembly.

[0034] The stator seat 1 is provided with an axial cavity 10 in the center, the annular plate 6 and the composite bearing 7 are both arranged in the axial cavity 10, and the bottom surface of the stator seat 1 is provided with a motor mounting hole 27. The axial cavity 10 is used to arrange the motor shaft 5, the annular plate 6 and the composite bearing 7, so that the annular plate 6 and the composite bearing 7 at the lower end of the motor shaft 5 are both located in the axial cavity 10, so that when the bottom surface of the stator seat 1 is used as the fixed surface of the motor, it will not affect the rotation of the motor shaft 5. The shaft cavity 10 of this embodiment is in the shape of a stepped shaft, with a step for installing the bearing 18 on the motor at the upper end, and a cylindrical middle part, whose diameter is adapted to the outer diameter of the radial bearing 9 in the composite bearing 7 to facilitate the insertion and installation of the radial bearing 9. The diameter of the lower part of the shaft cavity 10 is larger than the diameter of the cylindrical middle part, and this part is used to arrange the thrust bearing 8 in the composite bearing 7 and the annular plate 6 on the motor shaft 5. Since the bottom surface of the stator seat 1 is usually used as the fixed surface of the motor, the axial length of this part is larger than the sum of the thickness of the composite bearing 7 and the annular plate 6, and the diameter is larger than the outer diameter of the thrust bearing 8 and the annular plate 6 in the composite bearing 7, so that the composite bearing 7 and the annular plate 6 are accommodated in the stator seat 1 to avoid affecting the rotation of the annular plate 6 after the motor is installed.

[0035] The inner wall of the rotating housing 4 is cylindrical (see Figure 3), the cross section of the permanent magnet 3 is fan-shaped and evenly distributed on the circumference of the inner wall of the rotating shell 4, the outer arc surface of the permanent magnet 3 is arranged close to the cylindrical inner wall of the rotating shell 4, and an integral vertical ventilation and heat dissipation groove 11 is arranged between adjacent permanent magnets 3; the top cover 12 of the rotating shell 4 is provided with a heat dissipation hole 13, and in this embodiment, the top cover 12 is provided with radial spokes 26, the spokes 26 are 6, and fan-shaped heat dissipation holes 13 are formed between adjacent spokes 26. The provision of the ventilation and heat dissipation grooves 11 and the heat dissipation holes 13 is conducive to better heat dissipation of the motor, and the fan-shaped heat dissipation holes 13 have a larger heat dissipation area, which is more conducive to the heat dissipation of the motor. The top cover 12 of the rotating housing 4 is provided with an axial hole 15 in the center, and a sleeve 16 extends downward from the bottom surface of the top cover 12 at the axial hole 15. The side wall of the sleeve 16 is provided with a screw hole 17 for fixing the motor shaft 5. The longitudinal section of the motor shaft 5 of this embodiment is in an inverted T shape, the upper end of the motor shaft 5 is inserted into the axial hole 15, and the annular plate 6 is integrally arranged at the lower end of the motor shaft 5. The longitudinal section of the motor shaft 5 of this scheme is in an inverted T shape, that is, the annular plate 6 and the motor shaft 5 are an integral structure, and the upper part of the motor shaft 5 is fixed to the rotating housing 4 through two set screws 25 and the screw hole 17 on the sleeve 16 of the top cover 12. An upper bearing 18 is provided between the upper end of the motor shaft 5 and the stator seat 1. The upper bearing 18 is a radial bearing, and a screw 20 for fixing the rotor blade 19 extends from the upper end of the motor shaft 5. In this solution, the upper end of the motor shaft 5 extends out of the top cover 12 of the rotating housing 4 and is fixed to the rotor propeller 19 of the drone through a screw structure at the upper end of the motor shaft 5 .

[0036] Example 2

[0037] In such Figure 5 Figure 6 Figure 7 In the embodiment 2 shown, a motor for a drone includes: a stator assembly, the stator assembly includes a stator seat 1 and a winding 2. A rotor assembly, the rotor assembly includes a rotating housing 4 provided with a permanent magnet 3, and the center of the rotating housing 4 is fixedly connected to the motor shaft 5. The winding 2 of this embodiment is arranged on the stator core 14 on the outer periphery of the stator seat 1, and the winding 2 is evenly distributed in the circumferential direction of the stator core 14. The number of windings 2 is less than the number of permanent magnets 3; the number of windings 2 in this embodiment is 14, and the number of permanent magnets 3 is 16 (see Figure 6 ).

[0038] The lower end of the motor shaft 5 is provided with an annular plate 6 of an independent structure, and a composite bearing 7 is provided between the lower end of the motor shaft 5 and the bottom end of the stator seat 1. The composite bearing 7 is an integrated structure of a thrust bearing 8 and a radial bearing 9. The thrust bearing 8 is horizontally arranged between the annular plate 6 and the stator seat 1 to bear the axial force; the radial bearing 9 is located between the motor shaft 5 and the stator seat 1 to bear the radial force of the motor. The thrust bearing 8 is horizontally arranged between the annular plate 6 and the stator seat 1, and the radial bearing 9 is located on the upper end surface of the thrust bearing 8. The radial bearing 9 is located between the motor shaft 5 and the stator seat 1. Both the thrust bearing 8 and the radial bearing 9 are needle bearings. Both the thrust bearing 8 and the radial bearing 9 are needle bearings, which can make the axial thickness of the thrust bearing 8 and the radial thickness of the radial bearing 9 easier to be made smaller, thereby reducing the volume, which is suitable for the requirement of the drone for a small motor volume.

[0039] The bottom of the composite bearing 7 of this embodiment constitutes a thrust bearing 8 (see Figure 7 ), the thrust bearing 8 includes two upper and lower parallel circular plates, and radial needle rollers are arranged between the upper and lower circular plates. This structure can make the axial thickness of the thrust bearing 8 very thin, which is more suitable for occasions such as drones that have high requirements on the volume and weight of the motor; the upper part of the composite bearing 7 constitutes a radial bearing 9, and the radial bearing 9 includes two coaxially arranged cylinders arranged inside and outside, and needle rollers are arranged between the coaxially arranged cylinders. The length direction of the needle rollers is parallel to the length direction of the cylinders. This structure can also make the radial thickness of the radial bearing 9 very thin, which is beneficial to occasions such as drones that have high requirements on the volume and weight of the motor. When it is necessary to withstand a large radial force, it can be solved by increasing the length of the inner and outer cylinders and the needle rollers. Increasing the length of the inner and outer cylinders and the needle rollers usually does not have a significant impact on the volume of the motor; the composite bearing 7 of the utility model adopts an integrated combination structure of a thrust bearing 8 and a radial bearing 9, the length of the inner cylinder of the radial bearing 9 is greater than the length of the outer cylinder, the inner diameter of the annular plate on the thrust bearing 8 is greater than the inner diameter of the annular plate below, and the lower end of the inner cylinder of the radial bearing 9 is welded and fixed to the inner circle of the annular plate below the thrust bearing 8, and the lower end of the outer cylinder of the radial bearing 9 is welded and fixed to the inner circle of the annular plate above the thrust bearing 8 to form an integrated composite bearing 7. In this way, the composite bearing 7 limits the positional relationship between the stator seat 1 and the motor shaft 5 in both the axial and radial directions, which can improve accuracy and facilitate assembly.

[0040] The stator seat 1 is provided with an axial cavity 10 in the center, and the annular plate 6, the composite bearing 7, and the annular plate fixing screws 28 for fixing the annular plate 6 are all arranged in the axial cavity 10, and the bottom surface of the stator seat 1 is provided with a motor mounting hole 27. The axial cavity 10 is used to arrange the motor shaft 5, the annular plate 6, the composite bearing 7, and the annular plate fixing screws 28 for fixing the annular plate 6, so that the annular plate 6 at the lower end of the motor shaft 5 and the annular plate fixing screws 28 for fixing the annular plate 6 are all located in the axial cavity 10, so that when the bottom surface of the stator seat 1 is used as the fixing surface of the motor, it will not affect the rotation of the motor shaft 5. The axial cavity 10 of this embodiment is in the shape of a stepped shaft, and the upper part is cylindrical, and its diameter is adapted to the outer diameter of the radial bearing 9 part in the composite bearing 7, so as to facilitate the insertion and installation of the radial bearing 9. The diameter of the lower part of the axial cavity 10 is larger than the diameter of the upper cylindrical part, and this part is used to arrange the thrust bearing 8 in the composite bearing 7, the annular plate 6 fixed on the motor shaft 5, and the annular plate fixing screws 28 for fixing the annular plate 6. Since the bottom surface of the stator seat 1 serves as the fixing surface of the motor, the axial length of this part should be greater than the sum of the thickness of the composite bearing 7, the annular plate 6 and the heads of the related screws, and the diameter should be greater than the outer diameter of the thrust bearing 8 and the annular plate 6 in the composite bearing 7, so that the composite bearing 7 and the annular plate 6 can be accommodated inside the stator seat 1 to avoid affecting the rotation of the annular plate 6 after the motor is installed.

[0041] The inner wall of the rotating housing 4 is cylindrical (see Figure 7), the cross section of the permanent magnet 3 is fan-shaped and evenly distributed on the circumference of the inner wall of the rotating shell 4, the outer arc surface of the permanent magnet 3 is arranged close to the cylindrical inner wall of the rotating shell 4, and an integral vertical ventilation and heat dissipation groove 11 is arranged between adjacent permanent magnets 3; the top cover 12 of the rotating shell 4 is provided with a heat dissipation hole 13, and in this embodiment, the top cover 12 is provided with radial spokes 26, and there are 4 spokes 26, and fan-shaped heat dissipation holes 13 are formed between adjacent spokes 26. The provision of ventilation and heat dissipation grooves 11 and heat dissipation holes 13 is conducive to better heat dissipation of the motor, and the fan-shaped heat dissipation holes 13 have a larger heat dissipation area, which is more conducive to the heat dissipation of the motor. A rotor blade mounting plate 21 is provided in the center of the top cover 12 of the rotating shell 4, and four rotor blade mounting holes are provided on the rotor blade mounting plate 21. The motor shaft 5 is an integral structure with the rotating shell 4 and is located below the rotor blade mounting plate 21. The lower end of the motor shaft 5 is provided with an annular plate fixing hole 22, and the annular plate 6 is fixed to the lower end of the motor shaft 5 by an annular plate fixing screw 28. The motor shaft of this solution is integrally arranged with the rotating housing 4, and a rotor blade mounting plate 21 is formed at the top center of the rotating housing 4, and the rotor blade 19 is directly fixed on the rotor blade mounting plate 21; the annular plate 6 at the lower end of the motor shaft 5 is separately arranged from the motor shaft 5, and is fixed to the motor shaft 5 through the fixing hole at the lower end of the motor shaft 5. An upper bearing 18 is arranged between the upper end of the motor shaft 5 and the stator seat 1, and the upper bearing 18 is a composite bearing 7, and the composite bearing 7 is an integrated combination structure of a thrust bearing 8 and a radial bearing 9. The thrust bearing 8 of the upper bearing 18 is in close contact with the rotor blade mounting plate 21, and the radial bearing 9 of the upper bearing 18 is located between the motor shaft 5 and the stator seat 1. The upper bearing 18 at the upper part of the motor shaft 5 of this solution adopts the same composite bearing 7 as the lower end of the motor shaft 5, and the installation direction of the composite bearing 7 is opposite to that of the composite bearing 7 at the lower end of the motor shaft 5. The thrust bearing 8 in the composite bearing 7 is in close contact with the rotor blade mounting plate 21 on the rotating housing 4 to ensure smooth rotation of the rotor blade 19 mounting plate.

[0042] Example 3

[0043] Embodiment 3 provides a drone, the drone includes a motor and a rotor blade 19 (see Figure 8 ), the motor adopts the drone motor of Example 1, the rotor propeller 19 is fixed on the motor shaft 5 of the drone motor, and a screw 20 is arranged on the upper end of the motor shaft 5. The screw 20 passes through the axial hole 15 of the top cover 12 of the rotating shell 4 and the rotor propeller 19 of the drone, and the rotor propeller 19 is fixed to the motor shaft 5 and the top cover 12 of the rotating shell 4 through the rotor propeller fixing nut 23, and a propeller pad 24 is arranged between the rotor propeller fixing nut 23 and the rotor propeller 19.

[0044] Example 4

[0045] Embodiment 4 provides a drone, the drone includes a motor and a rotor propeller 19, the motor is the drone motor of embodiment 2, a rotor propeller mounting plate 21 is provided in the center of the top cover 12 of the rotating housing 4, and four rotor propeller mounting holes are provided on the rotor propeller mounting plate 21 (see Figure 6 ), the rotor blade 19 is fixed on the rotating housing 4 of the drone motor.

[0046] In addition to the above-mentioned embodiments, within the scope disclosed in the claims and the specification of the utility model, the technical features or technical data of the utility model can be reselected and combined to form new embodiments, which can be achieved by those skilled in the art without creative work. Therefore, these embodiments that are not described in detail in the utility model should also be regarded as specific embodiments of the utility model and within the protection scope of the utility model.

Claims

1. A UAV motor, characterized in that: The motor comprises: A stator assembly, the stator assembly comprising a stator seat and a winding; A rotor assembly, the rotor assembly comprising a rotating housing provided with a permanent magnet, the center of the rotating housing being fixedly connected to the motor shaft; An annular plate is provided at the lower end of the motor shaft, and a composite bearing is provided between the lower end of the motor shaft and the bottom end of the stator seat. The composite bearing is an integrated structure of a thrust bearing and a radial bearing.

2. The UAV motor according to claim 1, characterized in that: The thrust bearing is horizontally arranged between the annular plate and the stator seat, the radial bearing is located on the upper end surface of the thrust bearing, and the radial bearing is located between the motor shaft and the stator seat.

3. The UAV motor according to claim 2, characterized in that: An axial cavity is provided in the center of the stator seat, the annular plate and the composite bearing are both arranged in the axial cavity, the thrust bearing and the radial bearing are both needle bearings; and a motor mounting hole is provided on the bottom surface of the stator seat.

4. The UAV motor according to claim 1, characterized in that: The inner wall of the rotating shell is cylindrical, the permanent magnets are evenly distributed on the circumference of the inner wall of the rotating shell, ventilation and heat dissipation grooves are arranged between adjacent permanent magnets; and heat dissipation holes are arranged on the top cover of the rotating shell.

5. The UAV motor according to claim 4, characterized in that: The windings are arranged on the stator core on the stator seat, the windings are evenly distributed in the circumferential direction of the stator core, and the number of the windings is less than the number of the permanent magnets.

6. The UAV motor according to claim 1, characterized in that: An axial hole is provided in the center of the top cover of the rotating shell, a sleeve is extended from the bottom surface of the top cover at the axial hole, a screw hole for fixing the motor shaft is provided on the side wall of the sleeve, the longitudinal section of the motor shaft is an inverted T-shape, the upper end of the motor shaft is inserted into the axial hole, and the annular plate is integrally arranged at the lower end of the motor shaft.

7. The UAV motor according to claim 6, characterized in that: An upper bearing is arranged between the upper end of the motor shaft and the stator seat, and the upper bearing is a radial bearing. A screw for fixing the rotor propeller extends from the upper end of the motor shaft.

8. The UAV motor according to claim 1, characterized in that: A rotor propeller mounting plate is provided in the center of the top cover of the rotating shell, the motor shaft and the rotating shell are an integral structure and are located below the rotor propeller mounting plate, an annular plate fixing hole is provided at the lower end of the motor shaft, and the annular plate is fixed to the lower end of the motor shaft.

9. The UAV motor according to claim 8, characterized in that: An upper bearing is provided between the upper end of the motor shaft and the stator seat. The upper bearing is a composite bearing. The composite bearing is an integrated combination structure of a thrust bearing and a radial bearing. The thrust bearing of the upper bearing is tightly attached to the rotor blade mounting plate, and the radial bearing of the upper bearing is located between the motor shaft and the stator seat.

10. A drone, characterized in that: The drone comprises a motor and a rotor propeller, wherein the motor is the drone motor according to any one of claims 1 to 9, and the rotor propeller is fixed on a motor shaft or a rotating housing of the drone motor.

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