Motor and unmanned aerial vehicle

Abstract

The embodiment of the utility model relates to the technical field of motors, and particularly discloses a motor and an unmanned aerial vehicle, the motor comprises a housing, an outer rotor assembly and a stator assembly, the housing is provided with a first through cavity, the first through cavity is provided with a first port and a second port, and the outer surface of the housing close to the second port is annularly provided with a convex part; the outer rotor assembly is fixed to the first port, and part of the outer rotor assembly is contained in the first through cavity. The stator assembly is contained in the first through cavity, the stator assembly and the outer rotor assembly can rotate relatively, and the machine shell rotates along with the outer rotor assembly. By means of the mode, the motor can introduce damping effect, change the rotation mode of the motor, consume the vibration energy of the motor, reduce the vibration amplitude, shorten the vibration duration time, improve the overall performance of the equipment and prolong the service life of the equipment through the convex parts arranged on the machine shell in the embodiment of the utility model.

Description

Technical Field

[0001] The embodiments of the utility model relate to the technical field of motors, and in particular to a motor and a drone. Background Art

[0002] As a power source that relies on the law of electromagnetic induction to provide power support for external equipment, the motor is used in industrial production, family life, transportation, aerospace and other fields. Among drone components, the motor is the most important part, providing power for the drone's flight. With the steady development of drones, the NVH (Noise, Vibration, Harshness) and service life of the motor have an increasingly significant impact on the actual user experience of the drone.

[0003] In the process of realizing the present invention, the inventors of the present invention found that: currently, the motor mainly includes a casing, a stator assembly and an outer rotor assembly. In the structure of the outer rotor motor, the outer rotor assembly usually causes a large noise during rotation. Usually, this situation is caused by the vibration mode of the casing during rotation, that is, the vibration energy during the rotation of the casing cannot be effectively consumed or suppressed, resulting in a large vibration amplitude and a long vibration duration, thereby affecting the overall performance and service life of the equipment. Utility Model Content

[0004] The main technical problem solved by the embodiments of the present invention is to provide a motor and a drone, which can change the rotation mode of the motor and improve the overall performance and service life of the equipment.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a motor, including: a casing, provided with a first through cavity, the first through cavity having a first port and a second port, and the outer surface of the casing near the second port is provided with a convex portion; an outer rotor assembly, fixed to the first port, and part of the outer rotor assembly is accommodated in the first through cavity; a stator assembly, accommodated in the first through cavity, the stator assembly and the rotor assembly can rotate relative to each other, and the casing rotates with the outer rotor assembly.

[0006] Optionally, along the direction from the first port to the second port, the thickness of the protrusion is 4 mm to 10 mm; the difference between the outer diameter of the protrusion and the outer diameter of the housing is 1 mm to 4 mm.

[0007] Optionally, the stator assembly includes a stator core and a stator base, the stator core is fixed to the stator base, and the stator core is used for winding the coil.

[0008] Optionally, the stator core includes a plurality of stator punchings, the stator punchings include a yoke ring and a plurality of stator teeth, the stator teeth include a gear rod and a gear shoe, one end of the gear rod is connected to the outer side of the yoke ring, and the gear shoe is fixed to the other end of the gear rod, the plurality of stator teeth are spaced around the outer side of the yoke ring, and two adjacent stator teeth are spaced to form stator slots, the plurality of gear shoes are surrounded by a circle, the stator punchings are stacked in sequence, and along the stacking direction of the plurality of stator punchings, the projections of the stator slots overlap, and the stator slots of the plurality of stator punchings are connected to form wiring slots, which are used to accommodate coils.

[0009] Optionally, the inner diameter of the yoke ring is 99 mm to 101 mm; the outer diameter of the circle formed by the plurality of tooth shoes is 136.9 mm to 138.1 mm.

[0010] Optionally, the width of the gear rod is 3.4 mm to 3.8 mm; the width of the yoke ring is 3.3 mm to 3.8 mm; the ratio of the spacing between two adjacent tooth shoes to the width of the tooth shoes is 0.31 to 0.37; the number of the plurality of stator teeth is 36, and the number of wiring grooves formed by two adjacent stator teeth is 36.

[0011] Optionally, the gear rod is coated with a first insulating coating, and the yoke ring is coated with a second insulating coating.

[0012] Optionally, the outer rotor assembly includes a plurality of magnetic parts, a bracket and a rotating shaft, the plurality of magnetic parts are fixed at intervals on the inner wall of the first through cavity, and the bracket shields the first port; the bracket is provided with a first through hole, and the rotating shaft passes through the first through hole and partially extends into the first through cavity.

[0013] Optionally, the stator assembly further includes a bearing, the inner ring of the bearing wraps the rotating shaft; the stator seat includes a second through hole, and the outer ring of the bearing is arranged on the wall surface of the stator seat in the second through hole, so that the rotating shaft and the stator seat can rotate relative to each other.

[0014] In order to solve the above technical problems, another technical solution adopted by the present invention is to provide a drone comprising the above motor.

[0015] The beneficial effects of the embodiment of the present invention are as follows: Different from the prior art, the embodiment of the present invention provides a motor including a housing, an outer rotor assembly and a stator assembly, wherein the outer rotor assembly and the stator assembly are both housed in the housing, and relative rotation can occur between the outer rotor assembly and the stator assembly, and the housing rotates with the outer rotor assembly; specifically, the housing includes a first through cavity, the first through cavity has a first port and a second port, and the outer surface of the housing near the second port is provided with a convex portion; the outer rotor assembly is fixed to the first port, and part of the outer rotor assembly is housed in the first through cavity; the stator assembly is housed in the first through cavity. Through the above structure, the embodiment of the present invention can introduce a damping effect by setting a convex portion on the housing, thereby changing the motor mode, consuming the vibration energy of the motor, reducing the vibration amplitude and shortening the vibration duration, and improving the overall performance and service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying any creative work.

[0017] Figure 1 This is an exploded schematic diagram of a motor provided by an embodiment of the present utility model;

[0018] Figure 2 This is a schematic structural diagram of a housing provided by an embodiment of the present utility model;

[0019] Figure 3 This is a structural diagram of the housing provided by an embodiment of the present utility model from another perspective;

[0020] Figure 4 This is a schematic structural diagram of a stator punching sheet provided by an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of an outer rotor assembly provided by an embodiment of the present utility model being arranged in a casing. DETAILED DESCRIPTION

[0022] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this utility model belongs. The terms used in this specification and in the description of this utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the relevant listed items.

[0024] See also Figure 1 The motor 1000 includes a casing 1, an outer rotor assembly 3 and a stator assembly 2. The outer rotor assembly 3 and the stator assembly 2 are both accommodated in the casing 1, wherein the outer rotor assembly 3 and the stator assembly 2 can rotate relative to each other, and the casing 1 can rotate along with the outer rotor assembly 3.

[0025] For the above-mentioned case 1, see Figure 2 and Figure 3 The casing 1 is provided with a first through cavity 11, which is a cylindrical thin-walled structure for accommodating the above-mentioned outer rotor assembly 3 and stator assembly 2. The first through cavity 11 has a first port 111 and a second port 112. The outer surface of the casing 1 near the second port 112 is annularly provided with a convex portion 12. Through the setting of the convex portion 12, a damping effect is introduced during the rotation of the motor 1000, thereby changing the rotation mode of the motor 1000. Specifically, the setting of the convex portion 12 changes the overall damping characteristics of the motor 1000, thereby reducing the vibration frequency of the motor 1000, reducing the vibration amplitude of the motor 1000, consuming vibration energy, and effectively suppressing the vibration amplitude of the outer rotor assembly 3. Finally, after reducing the amplitude and changing the vibration frequency in the working state, the motor 1000 significantly improves the working stability of the outer rotor assembly 3, reduces the structural fatigue, noise and energy loss caused by vibration of the motor 1000, and improves the operating efficiency and reliability of the equipment.

[0026] It should be noted that the reason for the above-mentioned change in vibration frequency is that the convex portion 12 increases the damping force of the outer rotor assembly 3 during rotation, and the outer rotor assembly 3 takes a longer time to reach the maximum amplitude, thereby reducing the vibration frequency.

[0027] In some embodiments, along the direction from the first port 111 to the second port 112 , the thickness L2 of the protrusion 12 is 4 mm to 10 mm; and the difference L1 between the outer diameter of the protrusion 12 and the outer diameter of the housing 1 is 1 mm to 4 mm.

[0028] For the above stator assembly 2, please refer to Figure 1 The stator assembly 2 is housed in the first through cavity 11. The stator assembly 2 and the outer rotor assembly 3 are rotatable relative to each other, and the housing 1 rotates with the outer rotor assembly 3. Specifically, the stator assembly 2 includes a stator core 21 and a stator base 22. The stator core 21 is fixed to the stator base 22 to prevent unintended movement or rotation between the stator core 21 and the stator base 22. The stator core 21 is used for winding the coil.

[0029] It is understandable that the fixing methods of the stator core 21 and the stator seat 22 include but are not limited to: welding, gluing, screwing, interference fit, etc. In this embodiment, preferably, the stator core 21 and the stator seat 22 are fixed using interference fit.

[0030] For further information, please also refer to Figure 4 The stator core 21 includes a plurality of stator punchings 211, and the stator punchings 211 include a yoke ring 2111 and a plurality of stator teeth 2112. The stator teeth 2112 include a gear rod 2112a and a tooth shoe 2112b. One end of the gear rod 2112a is connected to the outer side of the yoke ring 2111, and the tooth shoe 2112b is fixed to the other end of the gear rod 2112a. The plurality of stator teeth 2112 are arranged at intervals around the outer side of the yoke ring 2111. Two adjacent stator teeth 2112 are arranged at intervals to form stator slots 2112c. The plurality of tooth shoes 2112b are surrounded by a circle. The stator punchings 211 are stacked in sequence. Along the stacking direction of the plurality of stator punchings 211, the projections of the stator slots 2112c overlap, and the stator slots 2112c of the plurality of stator punchings 211 are connected to form a wiring slot 2113. The wiring slot 2113 is used to accommodate the coil.

[0031] It can be understood that the stator punching sheet 211 is processed by stamping, wire cutting, laser cutting, etc., and the thickness of the stator punching sheet 211 is 0.15 mm to 0.35 mm.

[0032] It should be noted that the specific number of the stator teeth 2112 can be changed according to needs. In this embodiment, the number of the stator teeth 2112 is preferably 36, and the number of the wiring slots 2113 formed by the corresponding stator teeth 2112 is preferably 36.

[0033] In some embodiments, the inner diameter D2 of the yoke ring 2111 is 99 mm to 101 mm; the outer diameter D1 of the circle formed by the plurality of tooth shoes 2112 b is 136.9 mm to 138.1 mm.

[0034] Furthermore, the dimensions of various parts of the stator teeth 2112 are customized, the width W1 of the gear rod 2112a is 3.4 mm to 3.8 mm; the width W2 of the yoke ring 2111 is 3.3 mm to 3.8 mm; the ratio of the spacing W3 between two adjacent tooth shoes 2112b to the width W4 of the tooth shoe 2112b is 0.31 to 0.37; through the above-mentioned customized size of the stator punching sheet 211, the air gap harmonics of the motor 1000 are optimized, and the specific order excitation force of the motor 1000 is reduced, thereby effectively reducing electromagnetic noise and improving the NVH (noise, vibration and harmness) level of the motor 1000.

[0035] In some embodiments, the gear rod 2112a is coated with a first insulating coating, and the yoke ring 2111 is coated with a second insulating coating, so that when the coil is wound on the gear rod 2112a and the yoke ring 2111, the insulating coating of the coil is prevented from falling off, causing the current in the coil to be conducted to the stator punching 211, affecting the normal operation of the motor 1000.

[0036] For the outer rotor assembly 3 above, see Figure 5 The outer rotor assembly 3 includes a plurality of magnetic parts 31, a bracket 32 and a rotating shaft 33. The magnetic parts 31 are permanent magnets, including but not limited to neodymium iron boron, samarium cobalt, etc. The plurality of magnetic parts 31 are fixed at intervals on the inner wall of the first through cavity 11 to form a stable magnetic field in the first through cavity 11, thereby providing the necessary magnetic flux for the operation of the motor 1000; the layout of the interval arrangement can maintain a stable magnetic field distribution during the operation of the motor 1000, reduce magnetic field fluctuations and distortion, thereby improving the operating stability and efficiency of the motor 1000, and because the magnetic parts 31 can generate a stable magnetic field, the motor 1000 does not require a complex excitation system, thereby simplifying the overall structure of the motor 1000. The bracket 32 covers the first port 111, and the specific bracket 32 is fixed to the first port 111; the bracket 32 is provided with a first through hole 321, and the rotating shaft 33 passes through the first through hole 321 and partially extends into the first through cavity 11. The cooperation between the bracket 32 and the rotating shaft 33 forms a single cantilever structure, which simplifies the internal support structure of the motor 1000 and facilitates the later installation and maintenance of the motor 1000.

[0037] It can be understood that the ways in which the bracket 32 is fixed to the first port 111 include but are not limited to screwing, clamping, welding, etc. In the present embodiment, preferably, the bracket 32 is fixed to the first port 111 of the casing 1 by screwing. Specifically, in some embodiments, the casing 1 is provided with a plurality of first screw holes 13 along a direction perpendicular to the axis, and the bracket 32 is provided with a screw connection portion 322 that can be extended into the first through cavity 11 in the casing 1, and a second screw hole 3221 is provided on the screw connection portion 322. The screw connection member passes through the first screw hole 13 and is screwed to the second screw hole 3221 to fix the bracket 32 to the casing 1.

[0038] In some embodiments, the stator assembly 2 also includes a bearing 23, the inner ring of the bearing 23 wraps the rotating shaft 33; the stator seat 22 includes a second through hole 221, and the outer ring of the bearing 23 is arranged on the wall surface of the stator seat 22 in the second through hole 221, so that the rotating shaft 33 and the stator seat 22 can rotate relative to each other, significantly reducing the direct contact between the rotating shaft 33 and the stator seat 22 during rotation, thereby greatly reducing the heat and wear generated by friction, and extending the service life of the rotating shaft 33 and the stator assembly 2; and the bearing 23 converts the original surface friction between the rotating shaft 33 and the inner wall of the second through hole 221 into the rolling friction of the bearing 23, so that the resistance that the rotating shaft 33 needs to overcome during rotation is reduced, so that the energy loss of the entire motor 1000 is reduced and the operating efficiency is improved.

[0039] In some embodiments, the stator assembly 2 also includes an end cover 24, and the rotating shaft 33 is fixed to the end cover 24 after extending into the second through hole 221, and the diameter of the end cover 24 is larger than the diameter of the second through hole 221, so as to limit the stator seat 22 and the stator bracket 32 to prevent the stator seat 22 and the stator bracket 32 from being displaced along the axial direction of the rotating shaft 33 when the motor 1000 is in the working state.

[0040] It can be understood that the fixing methods of the end cover 24 and the rotating shaft 33 include but are not limited to screw connection, clamping, welding, gluing, etc. In this embodiment, preferably, the end cover 24 is screwed to the rotating shaft 33.

[0041] In this embodiment, the motor 1000 includes a housing 1, an outer rotor assembly 3, and a stator assembly 2. The outer rotor assembly 3 and the stator assembly 2 are both housed in the housing 1, and the outer rotor assembly 3 and the stator assembly 2 can rotate relative to each other, with the housing 1 rotating along with the outer rotor assembly 3. Specifically, the housing 1 includes a first through cavity 11, the first through cavity 11 having a first port 111 and a second port 112, and a convex portion 12 is provided around the outer surface of the housing 1 near the second port 112. The outer rotor assembly 3 is fixed to the first port 111, and a portion of the outer rotor assembly 3 is housed in the first through cavity 11. The stator assembly 2 is housed in the first through cavity 11. Through the above structure, the embodiment of the utility model can introduce a damping effect by providing the convex portion 12 in the housing 1, thereby changing the mode of the motor 1000, consuming the vibration energy of the motor 1000, reducing the vibration amplitude and shortening the vibration duration, and improving the overall performance and service life of the device.

[0042] The present invention further provides a drone, comprising the motor 1000 described above. For the structure and function of the motor 1000, reference may be made to the above embodiments, which will not be described in detail here.

[0043] It should be noted that the preferred embodiments of the present invention are given in the specification and drawings of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments do not serve as additional limitations on the content of the present invention. The purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the description of the present invention; further, it is obvious to those skilled in the art that improvements or changes can be made based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A motor, characterized in that: include: The housing is provided with a first through cavity, the first through cavity has a first port and a second port, and the outer surface of the housing near the second port is provided with a convex portion; an outer rotor assembly fixed to the first port, and a portion of the outer rotor assembly is accommodated in the first through cavity; The stator assembly is accommodated in the first through cavity. The stator assembly and the outer rotor assembly can rotate relative to each other, and the housing rotates along with the outer rotor assembly.

2. The motor according to claim 1, characterized in that Along the direction from the first port to the second port, the thickness of the protrusion is: 4 mm to 10 mm; The difference between the outer diameter of the protrusion and the outer diameter of the housing ranges from 1 mm to 4 mm.

3. The motor according to claim 1, characterized in that The stator assembly includes a stator core and a stator base. The stator core is fixed to the stator base and is used for winding the coil.

4. The motor according to claim 3, characterized in that The stator core includes a plurality of stator punchings, each of which includes a yoke ring and a plurality of stator teeth. The stator teeth include a gear rod and a gear shoe. One end of the gear rod is connected to the outer side of the yoke ring, and the gear shoe is fixed to the other end of the gear rod. The plurality of stator teeth are spaced apart around the outer side of the yoke ring, and two adjacent stator teeth are spaced apart to form stator slots. The plurality of gear shoes form a circle. The stator punchings are stacked in sequence. Along the stacking direction of the plurality of stator punchings, the projections of the stator slots overlap, and the stator slots of the plurality of stator punchings are connected to form wiring slots, which are used to accommodate coils.

5. The motor according to claim 4, characterized in that The inner diameter of the yoke ring is 99 mm to 101 mm; The outer diameter of the circle formed by the plurality of tooth shoes is 136.9 mm to 138.1 mm.

6. The motor according to claim 5, characterized in that The width of the gear rod is 3.4 mm to 3.8 mm; The yoke ring width is 3.3 mm to 3.8 mm; The ratio of the distance between two adjacent tooth shoes to the width of the tooth shoes is 0.31 to 0.37; The number of the plurality of stator teeth is 36, and the number of wiring slots formed by two adjacent stator teeth is 36.

7. The motor according to any one of claims 4 to 6, characterized in that: The rack rod is coated with a first insulating coating, and the yoke ring is coated with a second insulating coating.

8. The motor according to claim 3, characterized in that The outer rotor assembly includes a plurality of magnetic members, a bracket and a rotating shaft, wherein the plurality of magnetic members are fixed to the inner wall of the first through cavity at intervals, and the bracket shields the first port; The bracket is provided with a first through hole, and the rotating shaft passes through the first through hole and partially extends into the first through cavity.

9. The motor according to claim 8, characterized in that The stator assembly further includes a bearing, wherein the inner ring of the bearing wraps around the rotating shaft; The stator seat includes a second through hole, and the outer ring of the bearing is arranged on the wall surface of the stator seat at the second through hole, so that the rotating shaft and the stator seat can rotate relative to each other.

10. A drone, characterized in that: The motor comprises the motor according to any one of claims 1 to 9.

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