An unmanned aerial vehicle motor

Abstract

A kind of unmanned plane motor, stator fixing seat is equipped in the lower part of shell interior, a plurality of lightening slots are equipped on stator fixing seat, the space where stator assembly and rotor assembly are located in shell is communicated with the space in rear cover.The axial and / or radial gap between rotor shaft and stator shaft is equipped, the axial center line of the magnetic field of rotor assembly is always below the axial center line of the magnetic field generated after stator assembly is energized.By improving stator assembly, the weight of motor is reduced, it is convenient to assemble, and the heat dissipation performance is improved.The structure of the gap between stator and rotor maintained by the magnetic field interaction force of stator and rotor ensures that the problems such as noise increase, current anomaly, temperature rise intensification and dust generation caused by friction between rotor and stator assembly or stator fixing seat during rotor movement are avoided when used in complex environment, and it is beneficial to the assembly of motor and cooperating water pump cam.

Description

Technical Field

[0001] This utility model relates to the field of motors, specifically to a motor used in agricultural drones / unmanned aerial vehicles (UAVs) to connect to and drive a water pump. Background Technology

[0002] On agricultural drones or similar drones, a motor-driven water pump is required for spraying pesticides, water, or other liquids. This typically involves assembling the separately manufactured motor and pump body components, with the pump's cam mounted on the motor's central shaft output end, and the pump body fixedly connected to the motor.

[0003] As equipment used in conjunction with drones, the motor's weight has a significant impact on its flight time. To maximize payload capacity, it is necessary to further reduce the motor's weight. At the same time, it is also necessary to maintain or improve the motor's performance and quality while reducing weight, to facilitate assembly and ensure reliability in complex environments. Utility Model Content

[0004] In view of the above, this utility model proposes a drone motor. By improving the stator assembly, the motor weight is reduced, making assembly easier and improving heat dissipation performance. The structure that maintains the gap between the stator and rotor through the magnetic field interaction force ensures that, when used in complex environments, friction between the rotor and the stator assembly or stator mounting base during operation avoids problems such as increased noise, abnormal current, aggravated temperature rise, and dust generation. It also facilitates the assembly of the motor with the water pump cam used in conjunction with it.

[0005] According to this utility model, a drone motor is provided with a housing, inside which a stator assembly and a rotor assembly are provided. A front cover is connected to the top of the housing, and a rear cover is connected to the bottom of the housing. A stator mounting base is provided at the bottom inside the housing, and a stator shaft for mounting the stator assembly is provided on the stator mounting base. The stator shaft has a through stator shaft hole. The rotor assembly is fixedly mounted on a central shaft. The top end of the central shaft extends out of the front cover and connects to the water pump assembly to be assembled. The lower end of the central shaft is installed in the stator shaft hole. The stator mounting base has several weight-reducing slots. The space inside the housing where the stator assembly and the rotor assembly are located is connected to the space inside the rear cover.

[0006] Preferably, a motor control board is provided inside the rear cover, and the stator lead wires in the stator assembly are connected to the motor control board through the weight reduction slot.

[0007] Preferably, the outer peripheral wall of the stator shaft and / or the inner peripheral wall of the stator assembly are provided with a plurality of adhesive grooves, and when the stator assembly is installed on the stator shaft, an adhesive layer is filled in the adhesive grooves between the stator shaft and the stator assembly.

[0008] Furthermore, the rotor assembly includes a rotor mounting base, a rotor shaft is provided in the middle of the rotor mounting base, the rotor shaft is fixedly connected to the central shaft through a rotor shaft hole and is located above the stator shaft; the magnets of the rotor assembly are provided on the outside of the stator assembly.

[0009] Furthermore, an axial and / or radial clearance is provided between the rotor shaft and the stator shaft.

[0010] Preferably, the axial centerline of the rotor assembly's own magnetic field is always below the axial centerline of the magnetic field generated by the stator assembly after it is energized.

[0011] Furthermore, the central shaft and the rotor shaft hole are connected by an interference fit, or the central shaft and the rotor mounting base are connected by an insert injection molding structure.

[0012] Furthermore, the stator fixing base and the housing are an integral structure.

[0013] Preferably, the stator shaft and the stator fixing seat are integrally die-cast or insert injection molded structures.

[0014] Furthermore, the rear cover and housing are connected and fixed to the front cover via a connecting long shaft.

[0015] After adopting the technology proposed in this utility model, the technical solution of this utility model has the following beneficial effects:

[0016] 1) Improvements to the stator assembly reduced the motor's weight, facilitated assembly, and improved heat dissipation performance;

[0017] 2) The structure that maintains the gap between the stator and rotor through the magnetic field interaction force ensures that when used in complex environments, it avoids problems such as increased noise, abnormal current, increased temperature rise and dust generation caused by friction between the rotor and the stator assembly or stator mounting base during rotor movement. It also facilitates the assembly of the motor and the water pump cam used in conjunction with it. Attached Figure Description

[0018] Figure 1 A structural diagram of a drone motor according to an embodiment of this application is shown;

[0019] Figure 2 A cross-sectional view of the unmanned aerial vehicle motor structure according to an embodiment of this application is shown;

[0020] Figure 3 A structural diagram of the housing in a drone motor according to an embodiment of this application is shown.

[0021] Explanation of icon numbers:

[0022] Casing 11

[0023] Front cover 12

[0024] Back cover 13

[0025] Connecting long shaft 14

[0026] Stator assembly 2

[0027] Stator lead 27

[0028] Rotor assembly 3

[0029] Rotor mounting base 30

[0030] Gap 304

[0031] Rotor shaft 31

[0032] Rotor shaft bore 310

[0033] 32 Magnet

[0034] Stator mounting base 4

[0035] Stator shaft 41

[0036] Stator shaft hole 410

[0037] Glue tank 411

[0038] Weight reduction slot 43

[0039] Central axis 5

[0040] Motor control board 7 Detailed Implementation

[0041] The present invention will now be described in further detail with reference to the embodiments given in the accompanying drawings. The described embodiments include various specific details to aid understanding, but they are only to be considered exemplary and represent a portion, not all, of the embodiments of the present invention. Furthermore, to make the specification clearer and more concise, detailed descriptions of functions and structures well-known in the art will be omitted.

[0042] Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "upper," "lower," "above," and "below" used in this application refer to the general vertical relationship shown in the accompanying drawings. When the placement changes, such as during a flip, the corresponding positional relationships should also be adjusted to understand or implement the technical solution of this application.

[0043] like Figures 1 to 3As shown, a drone motor includes a housing 11, within which a stator assembly 2 and a rotor assembly 3 are housed. A front cover 12 is connected to the top of the housing 11, and a rear cover 13 is connected to the bottom of the housing 11. A stator mounting base 4 is located at the lower part of the interior of the housing 11, and a stator shaft 41 for mounting the stator assembly 2 is provided on the stator mounting base 4. The stator shaft 41 has a through stator shaft hole 410. The rotor assembly 3 is fixedly mounted on a central shaft 5. The top end of the central shaft 5 extends out of the front cover 12 and connects to a water pump assembly to be assembled. The lower end of the central shaft 5 is installed in the stator shaft hole 410. The stator mounting base 4 has several weight-reducing slots 43. The space inside the housing 11 containing the stator assembly 2 and the rotor assembly 3 is connected to the space inside the rear cover 13.

[0044] The weight-reducing slot 43 is a general term and may include a number of through slots or through holes for weight reduction, or a number of through slots and through holes for weight reduction.

[0045] The rear cover 13 is provided with a motor control board 7, and the stator lead wire 27 in the stator assembly 2 is connected to the motor control board 7 through the weight reduction slot 43.

[0046] The stator shaft 41 has a plurality of adhesive grooves 411 on its outer peripheral wall and / or the stator assembly 2 on its inner peripheral wall. When the stator assembly 2 is installed on the stator shaft 41, an adhesive layer is filled in the adhesive grooves 411 between the stator shaft 41 and the stator assembly 2.

[0047] The rotor assembly 3 includes a rotor mounting base 30, and a rotor shaft 31 is provided in the middle of the rotor mounting base 30. The rotor shaft 31 is fixedly connected to the central shaft 5 through a rotor shaft hole 310 and is located above the stator shaft 41. The magnet 32 ​​of the rotor assembly 3 is provided on the outside of the stator assembly 2.

[0048] An axial and / or radial clearance 304 is provided between the rotor shaft 31 and the stator shaft 41.

[0049] The axial centerline of the rotor assembly 3's own magnetic field is always below the axial centerline of the magnetic field generated by the stator assembly 2 after it is energized. During installation, the upper end face of the rotor shaft 31 of the rotor mounting base 30 of the rotor assembly 3 is in contact with the lower end face of the front bearing, thereby limiting the upward movement space of the rotor assembly 3. Before energization, the magnetic field centerlines of the rotor assembly and the stator assembly cannot be pulled to overlap because they are constrained by axial positioning, ensuring that the magnetic lines of force of the rotor assembly are always below the magnetic lines of force of the stator assembly.

[0050] When energized, the magnetic field generated by the stator assembly pulls the rotor assembly upward, but the rotor assembly cannot move upward because of the axial limit. This ensures that the gap between the two is always maintained and no friction is generated.

[0051] When the external cam is pressed, the rotor assembly sinks and shifts downwards with the force on the central shaft. After the cam pressing is completed and the external force is removed, the rotor assembly will return to its original state under the action of the mutual magnetic field between the rotor assembly and the stator assembly, thus ensuring the external dimensions of the central shaft exposed to the front cover.

[0052] To better achieve the above objectives, the height of the magnet in the rotor assembly is greater than the height of the stator core in the stator assembly. Furthermore, even when the rotor assembly is restricted in its assembly position, the axial dimension of the magnet must still be able to completely enclose the stator core, and the dimension of the lower end face of the magnet extending beyond the lower end face of the stator core must be greater than the dimension of the upper end face of the magnet extending beyond the upper end face of the stator core.

[0053] The central shaft 5 and the rotor shaft hole 310 are connected by an interference fit, or the central shaft 5 and the rotor fixing seat 30 are connected by an insert injection molding structure. When the central shaft 5 and the rotor fixing seat 30 are connected by an insert injection molding structure, the central shaft is a metal rod, the rotor fixing seat is a high-temperature resistant engineering plastic, and the rotor fixing seat 30 is an integral part consisting of the functional structures provided thereon, namely the rotor shaft 31 and the rotor shaft hole 310.

[0054] The diameter of the central shaft 5 is smaller than the diameter of the stator shaft hole 410.

[0055] The stator fixing seat 4 and the housing 11 are an integral structure. Furthermore, the stator shaft 41 and the stator fixing seat 4 are integrally die-cast or insert injection molded. Depending on the needs, integral die-casting, insert, or separate structures can be adopted. The implementation and cost of insert and separate structures are relatively high and need to be considered comprehensively.

[0056] The rear cover 13 and the housing 11 are connected and fixed to the front cover 12 via a connecting shaft 14. The end of the connecting shaft 14 is threaded and connected to the front cover 12 via a threaded connection.

[0057] The terms circumferential, axial, or similar used in this application refer to the central shaft of the motor, i.e., the axial direction is the axial direction of the central shaft, and so on.

[0058] The connecting long shaft 14 is a long screw structure in general. Its head can adopt common screw head types such as round head, countersunk head, semi-round head, cylindrical head, hex head, internal hex, cross slot, etc. to facilitate fastening operations. The countersunk hole in the figure is designed adaptively according to different head types.

[0059] According to the drone motor of this application embodiment, the stator mounting base is set as a hollow structure through weight-reducing slots and other structures, which serves multiple purposes. On the one hand, it reduces the motor's own weight; on the other hand, it improves heat dissipation performance, utilizing the rear space and the outer shell surface to accelerate heat dissipation and extend service life; at the same time, the special stator mounting base structure also makes it easier to avoid moving rotor components when routing motor wiring, and there is no need to set up wire blocking structures or other structures to protect the motor connection wires.

[0060] According to the embodiment of the present application, the drone motor has a stator groove mounting structure with a groove on the inner circumference of the stator. When installing the stator, an interference fit is no longer required, but a clearance fit is used for assembly. The adhesive layer after the glue has solidified provides connection and fixation performance, which facilitates the assembly of components.

[0061] According to the embodiments of this application, when the central shaft 5 is subjected to external forces that may cause axial displacement of the rotor assembly, including impacts that may occur during use in complex environments, and the axial force on the central bearing caused by mounting the water pump's cam on the motor's central shaft output end during motor and water pump assembly, the central shaft may shift downwards. The vertical and horizontal orientations described in this application are based on the positions shown in the accompanying drawings and should be understood according to their corresponding positions in actual use. When these situations occur, the magnetic centers of the stator assembly 2 and rotor assembly 3 shift and automatically return to their original positions due to the magnetic field force. Therefore, the rotor tends to be pulled upwards to maintain alignment, ensuring the axial and / or radial clearance 304 between the rotor shaft 31 and the stator shaft 41. After the cam is installed, the pressed-down rotor can rise again, maintaining the clearance and preventing increased noise, abnormal current, increased temperature rise, and the generation of wear debris and dust due to friction during rotation.

[0062] The rotor shaft 31 is fixedly connected to the central shaft 5 through the rotor shaft hole 310. The two can be connected by interference fit, adhesive, riveting, key connection, insert injection molding or a combination of methods to ensure reliable connection.

[0063] According to the embodiments of the UAV motor in this application, the motor weight is reduced by improving the stator assembly, which facilitates assembly and improves heat dissipation performance. The structure that maintains the gap between the stator and rotor through the magnetic field interaction force of the stator and rotor ensures that when used in complex environments, it avoids problems such as increased noise, abnormal current, aggravated temperature rise and generation of wear debris and dust caused by friction between the rotor and the stator assembly or stator mounting base during rotor movement. It also facilitates the assembly of the motor with the water pump cam used in conjunction with it.

Claims

1. A drone motor, characterized in that, The device comprises a housing containing a stator assembly and a rotor assembly. A front cover is connected to the top of the housing, and a rear cover is connected to the bottom of the housing. A stator mounting base is located at the bottom of the housing, and the stator mounting base has a stator shaft for mounting the stator assembly. The stator shaft has a through-hole. The rotor assembly is fixedly mounted on a central shaft. The top end of the central shaft extends out of the front cover and connects to the water pump assembly to be assembled. The lower end of the central shaft is installed in the stator shaft hole. The stator mounting base has several weight-reducing slots. The space containing the stator assembly and rotor assembly inside the housing is connected to the space inside the rear cover.

2. The UAV motor according to claim 1, characterized in that, The rear cover contains a motor control board, and the stator lead wires in the stator assembly are connected to the motor control board through the weight reduction slot.

3. The UAV motor according to claim 1, characterized in that, The outer peripheral wall of the stator shaft and / or the inner peripheral wall of the stator assembly are provided with a plurality of adhesive grooves. When the stator assembly is installed on the stator shaft, an adhesive layer is filled in the adhesive grooves between the stator shaft and the stator assembly.

4. A drone motor according to claim 1, characterized in that, The rotor assembly includes a rotor mounting base, a rotor shaft is provided in the middle of the rotor mounting base, the rotor shaft is fixedly connected to the central shaft through a rotor shaft hole and is located above the stator shaft; the magnets of the rotor assembly are provided on the outside of the stator assembly.

5. A drone motor according to claim 4, characterized in that, An axial and / or radial clearance is provided between the rotor shaft and the stator shaft.

6. A drone motor according to claim 5, characterized in that, The axial centerline of the rotor assembly's own magnetic field is always below the axial centerline of the magnetic field generated by the stator assembly after it is energized.

7. A drone motor according to claim 4, characterized in that, The central shaft and the rotor shaft hole are connected by an interference fit, or the central shaft and the rotor mounting base are connected by an insert injection molding structure.

8. A drone motor according to claim 1, characterized in that, The stator mounting base and the housing are an integral structure.

9. A drone motor according to claim 8, characterized in that, The stator shaft and the stator fixing seat are integrally die-cast or insert injection molded structures.

10. A drone motor according to claim 1, characterized in that, The rear cover and housing are connected and fixed to the front cover via a connecting long shaft.

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