Outer rotor brushless motor

Abstract

The utility model discloses an outer rotor brushless motor, and belongs to the technical field of unmanned aerial vehicle manufacturing. The outer rotor brushless motor mainly comprises an installation platform, a stator assembly, an outer rotor assembly and a sealing sleeve. Wherein a control circuit board is arranged on the mounting platform; a stator assembly is arranged on the control circuit board, and a coil winding is arranged in the stator assembly; an outer rotor assembly is arranged on the outer side of the stator assembly, a magnetic ring is arranged on the outer rotor assembly, the magnetic ring is arranged on the outer wall surface of the stator assembly, and a rotating shaft is arranged in the outer rotor assembly; a bearing is fixedly arranged on one side of the mounting platform and is rotationally connected with the peripheral surface of the rotating shaft; sealing sleeves are arranged on the outer wall face of the stator assembly and the outer wall face of the control circuit board in a surrounding mode. Compared with the prior art, the influence of external rainwater on the stator assembly and the control circuit board is reduced, the probability of normal return flight of the unmanned aerial vehicle in rainy days is improved to a certain extent, and therefore the unmanned aerial vehicle has high practicability.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) manufacturing technology, and in particular to an external rotor brushless motor. Background Technology

[0002] An external rotor brushless motor is a type of motor that is commonly used in the propellers of drones. The rotation of the external rotor brushless motor drives the propellers to rotate, thereby enabling the drone to fly. This type of motor has a stator assembly and an external rotor assembly inside, with the external rotor assembly located outside the stator assembly, hence the name external rotor brushless motor.

[0003] Currently, drones equipped with external rotor brushless motors often experience malfunctions in their propellers after operating in the rain for a period of time. This can affect the drone's normal flight and prevent it from returning to base properly after completing its data collection mission, causing significant inconvenience to staff. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an external rotor brushless motor, which mainly includes a mounting platform, a power transmission assembly, a stator assembly, an external rotor assembly, bearings, and a sealing sleeve. During use, the sealing sleeve reduces the probability of rainwater contacting the stator assembly and control circuit board. Compared to existing technologies, this invention reduces the impact of rainwater on the stator assembly and control circuit board, thereby increasing the likelihood of drones returning to base normally in rainy weather, thus demonstrating high practicality.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] External rotor brushless motor, including:

[0007] Installation platform;

[0008] A power transmission component is disposed on the mounting platform, and a control circuit board is disposed in the power transmission component;

[0009] A stator assembly is disposed on the control circuit board, and the stator assembly is provided with coil windings;

[0010] An outer rotor assembly has a magnetic ring on its inner circumferential surface, the magnetic ring is arranged around the outer wall of the stator assembly, and the outer rotor assembly has a rotating shaft, the end of the rotating shaft passing through the mounting platform;

[0011] A bearing is disposed on the side of the mounting platform away from the control circuit board, and the bearing is rotatably connected to the outer peripheral surface of the rotating shaft;

[0012] in,

[0013] A sealing sleeve is provided between the outer rotor assembly and the mounting platform, and the sealing sleeve surrounds the outer wall surface of the stator assembly and the outer wall surface of the control circuit board.

[0014] Furthermore, the power delivery component includes:

[0015] Power interface;

[0016] One end of the power interface is electrically connected to the control circuit board, and the other end of the power interface passes through the sealing sleeve.

[0017] Furthermore, the power interface is a USB power interface.

[0018] Furthermore, the stator assembly includes:

[0019] Iron core;

[0020] The iron core is mounted on the control circuit board, and a cylindrical part is formed in the middle of the iron core. The coil winding is wound between the outer wall of the iron core and the cylindrical part.

[0021] in,

[0022] The coil winding is electrically connected to the control circuit board, and part of the outer circumferential surface of the rotating shaft is surrounded by the inner circumferential surface of the cylindrical object.

[0023] Furthermore, the coil winding has a three-phase winding structure.

[0024] Furthermore, the outer rotor assembly includes:

[0025] case;

[0026] The housing has an opening on one side, and an installation cavity is provided in the housing. The housing is fitted onto the outer wall of the iron core. The rotating shaft is provided in the middle of the bottom wall of the installation cavity, and the magnetic ring is provided on the inner circumferential surface of the installation cavity.

[0027] Furthermore, the magnetic ring is made of neodymium iron boron.

[0028] Furthermore,

[0029] The stator assembly further includes:

[0030] Partition cylinder;

[0031] The outer circumferential surface of the partition cylinder is connected to the inner circumferential surface of the cylindrical object. A groove is provided at one end of the partition cylinder facing the shell, and the rotating shaft passes through the partition cylinder. The inner diameter of the partition cylinder is larger than the diameter of the rotating shaft.

[0032] The external rotor assembly also includes:

[0033] Bumps;

[0034] The protrusion is disposed in the middle of the bottom wall of the mounting cavity, the top end of the protrusion is connected to the end of the rotating shaft near the housing, and the top end of the protrusion has a recessed portion that is adapted to the partition cylinder.

[0035] in,

[0036] The recessed portion divides the protrusion into a first part and a second part. The diameter of the first part of the protrusion is equal to the inner diameter of the partition cylinder, and the height of the second part of the protrusion is greater than the depth of the groove.

[0037] Furthermore, the control circuit board is a PCB board.

[0038] Furthermore, a voltage regulator module is integrated into the PCB board.

[0039] The beneficial effects of this utility model are:

[0040] 1. The external rotor brushless motor provided by this utility model is equipped with a sealing sleeve, which can reduce the probability of external rainwater contacting the stator assembly and control circuit board, thereby increasing the chances of the drone returning normally on rainy days to a certain extent.

[0041] 2. The external rotor brushless motor is equipped with bearings, which can stabilize the connection between the external rotor assembly and the mounting platform, thereby ensuring the stable rotation of the shaft in the external rotor assembly. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0043] Figure 2 This is a schematic diagram of the assembly structure of the stator assembly, control circuit board, and mounting platform of this utility model;

[0044] Figure 3 This is a schematic diagram of the external rotor assembly of this utility model.

[0045] Figure label:

[0046] 1. Install the platform;

[0047] 21. Control circuit board; 22. Power interface;

[0048] 3. Stator assembly; 31. Iron core; 32. Coil winding; 33. Spacer; 34. Groove;

[0049] 4. External rotor assembly; 41. Housing; 42. Mounting cavity; 43. Magnetic ring; 44. Shaft; 45. Protrusion; 46. Recess;

[0050] 5. Bearings;

[0051] 6. Sealing sleeve. Detailed Implementation

[0052] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0053] Example 1

[0054] As attached Figure 1 -Appendix Figure 3 As shown, this embodiment discloses an external rotor brushless motor to reduce the probability of rainwater contacting the stator assembly 3 and control circuit board 21. It mainly includes a mounting platform 1, a power transmission assembly (not marked in the figure), a stator assembly 3, an external rotor assembly 4, a bearing 5, and a sealing sleeve 6. In use, the power transmission assembly is first connected to an external power source, allowing the control circuit board 21 to receive normal operating current. Simultaneously, an external driver (not shown in the figure) sends a corresponding speed signal to the control circuit board 21 to drive the drone's propellers to rotate. Then, the control circuit board 21 transmits brushless DC power to the coil winding 32 in the stator assembly 3. At this time, the coil winding 32 receives current support and continuously generates a magnetic field, which repels the magnetic ring 43 in the external rotor assembly 4. Subsequently, the stator assembly 3 and the external rotor assembly 4 will rotate relative to each other, while the stator assembly 3 is fixedly mounted on the control circuit board 21. On the circuit board 21, the control circuit board 21 is fixedly mounted on the mounting platform 1; therefore, the magnetic ring 43 will rotate around the stator assembly 3, and the overall structure of the outer rotor assembly 4 will rotate. Of course, the rotating shaft 44 in the outer rotor assembly 4 will also rotate; during this process, the rotating shaft 44 can drive the propeller to rotate, allowing the drone to fly into the sky; in addition, when the drone performs a mission in the rain, the sealing sleeve 6 set around the outer circumference of the stator assembly 3 and the control circuit board 21 can reduce the probability of rainwater coming into contact with the stator assembly 3 and the control circuit board 21, thereby increasing the chance of the drone returning normally in the rain to a certain extent.

[0055] The specific structure of the external rotor brushless motor is as follows: It includes a mounting platform 1, on which a power transmission assembly is mounted, and a control circuit board 21 is mounted in the power transmission assembly; a stator assembly 3 is mounted on the control circuit board 21, and a coil winding 32 is mounted in the stator assembly 3, which is electrically connected to the control circuit board 21; an external rotor assembly 4 is mounted on the outside of the stator assembly 3, and a magnetic ring 43 is mounted on the inner circumferential surface of the external rotor assembly 4, which surrounds the outer wall of the stator assembly 3; a rotating shaft 44 is mounted in the external rotor assembly 4, and the end of the rotating shaft 44 passes through the mounting platform 1; a bearing 5 is fixedly mounted on the side of the mounting platform 1 away from the control circuit board 21, and the bearing 5 is rotatably connected to the outer circumferential surface of the rotating shaft 44; a sealing sleeve 6 is provided between the external rotor assembly 4 and the mounting platform 1, and the sealing sleeve 6 surrounds the outer wall of the stator assembly 3 and the outer wall of the control circuit board 21. Compared with the prior art, this invention reduces the impact of external rainwater on the stator assembly and control circuit board, and to a certain extent increases the probability of the drone returning to base normally in rainy weather. Therefore, it has high practicality.

[0056] In a specific application scenario, as shown in the appendix Figure 1 As shown, the power transmission component mainly includes a control circuit board 21 and a power interface 22; wherein, the control circuit board 21 is disposed at the bottom of the mounting platform 1; normally, the control circuit board 21 is electrically connected to a power interface 22, and the terminals of the power interface 22 extend to the outside of the control circuit board 21 and pass through the sealing sleeve 6. This design facilitates connection to an external power supply terminal, thereby supplying power to the entire circuit of this embodiment.

[0057] Furthermore, the power interface 22 can be a USB power interface; wherein, the USB power interface improves the applicability of this embodiment; at the same time, the power interface 22 of this embodiment is USB, which makes it convenient for staff to perform performance tests on this embodiment. For example, by using a USB cable to connect this embodiment to an oscilloscope, adjusting the test parameters of the oscilloscope, the performance of this embodiment can be judged based on the results displayed by the oscilloscope.

[0058] In a specific application scenario, as shown in the appendix Figure 2 As shown, the stator assembly 3 mainly includes an iron core 31 and a coil winding 32; wherein, the iron core 31 is disposed at the top of the control circuit board 21, and a plurality of salient pole stators (not marked in the figure) are disposed in the iron core 31, and a cylindrical object (not marked in the figure) is formed on the top of the plurality of salient pole stators at the top of the control circuit board 21; normally, a recess (not shown in the figure) is formed on each salient pole stator; the coil winding 32 is wound around the recess, and the coil winding 32 is electrically connected to the control circuit board 21; in addition, part of the outer peripheral surface of the aforementioned rotating shaft 44 is surrounded by the inner peripheral surface of the cylindrical object.

[0059] Furthermore, the coil winding 32 can be a three-phase winding structure, which makes the coil winding 32 have the characteristics of smooth operation and high efficiency.

[0060] In a specific application scenario, as shown in the appendix Figure 3 As shown, the outer rotor assembly 4 mainly includes a housing 41, a magnetic ring 43, and a rotating shaft 44; wherein, the upper side of the housing 41 is open, and the interior of the housing 41 has a mounting cavity 42; the housing 41 is fitted onto the outer wall of the stator assembly 3, as shown in the attached figure. Figure 1 As shown; a rotating shaft 44 is provided in the middle of the bottom wall of the mounting cavity 42, and a magnetic ring 43 is provided on the inner circumferential surface of the mounting cavity 42.

[0061] Furthermore, the magnetic ring 43 is made of neodymium iron boron, which gives the magnetic ring 43 the characteristics of high magnetic performance and the ability to achieve small size and lightweight.

[0062] Furthermore, the control circuit board 21 can be a PCB board; wherein, the PCB board has the characteristics of small size, high efficiency and low production cost.

[0063] Example 2

[0064] As attached Figure 1 -Appendix Figure 3 As shown, this embodiment discloses an external rotor brushless motor to enhance the working performance of the aforementioned embodiment 1. In addition to the components in the aforementioned embodiment 1, it also includes a partition cylinder 33 and a protrusion 45. The partition cylinder 33 is disposed on the inner circumferential surface of the aforementioned cylindrical object. When the magnetic field generated by the stator assembly 3 is unstable, causing the rotating shaft 44 to wobble and rotate, the partition cylinder 33 can prevent the rotating shaft 44 from damaging the iron core 31. (See attached...) Figure 2 and appendix Figure 3 As shown, the protrusion 45 is disposed inside the mounting cavity 42 of the housing 41. In conjunction with the aforementioned partition 33, it can reduce the degree of wear between the mounting cavity 42 and the stator assembly 3.

[0065] In a specific application scenario, as shown in the appendix Figure 2 As shown, the partition cylinder 33 has a groove 34 facing the top of the housing 41. The aforementioned rotating shaft 44 passes through the top of the partition cylinder 33, and there is a circular protrusion (not marked in the figure) near the inner hole of the partition cylinder 33 in the groove 34. In addition, the inner diameter of the partition cylinder 33 is larger than the diameter of the rotating shaft 44. As shown in the attached figure... Figure 3As shown, the aforementioned protrusion 45 is generally disposed in the middle of the bottom wall of the mounting cavity 42. The top end of the protrusion 45 is connected to the bottom end of the rotating shaft 44. A recess 46 is provided on the top end of the protrusion 45 near its outer side. The recess 46 is adapted to the partition cylinder 33. The recess 46 divides the protrusion 45 into a first part and a second part. The diameter of the first part of the protrusion 45 is equal to the inner diameter of the partition cylinder 33. The height of the second part of the protrusion 45 is greater than the depth of the aforementioned groove 34. The diameter of the rotating shaft 44 is smaller than the diameter of the first part of the protrusion 45. In use, the top end of the rotating shaft 44 is passed through the inner hole of the partition cylinder 33, and the first part of the protrusion 45 is also inserted into the inner hole of the partition cylinder 33; then, the recessed part 46 of the protrusion 45 completely covers the protrusion on the partition cylinder 33, and the end face of the second part of the protrusion 45 is in close contact with the groove 34 of the partition cylinder 33; at this time, there is a certain distance between the bottom wall of the mounting cavity 42 and the coil winding 32. This design can reduce the wear between the outer rotor assembly 4 and the stator assembly 3 and extend the service life of this embodiment.

[0066] This embodiment takes into account one situation, and the specific solution is as follows: A voltage regulator module (not shown in the figure) is integrated in the PCB board. The PCB board can provide a stable current to the coil winding 32, so that the coil winding 32 can provide a stable magnetic field, which can prevent the rotating shaft 44 from shaking during rotation.

[0067] In addition, the outer wall surface of the iron core 31 is arc-shaped, and the outer wall surfaces of the two adjacent salient pole stators have rounded corners. This ensures that the iron core 31 experiences minimal wear during the assembly and disassembly of this embodiment.

[0068] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” and “the” used in this invention may also include the plural forms. It should be further understood that the term “comprising” as used in this invention means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

Claims

1. An external rotor brushless motor characterized by, The utility model relates to a kind of power supply transmission components, including: mounting platform (1);Power supply transmission component is set on the mounting platform (1), control circuit board (21) is provided in the power supply transmission component;Stator assembly (3) is set on the control circuit board (21), coil winding (32) is provided in the stator assembly (3);Outer rotor assembly (4) is provided with magnetic ring (43) in inner circumferential surface, the magnetic ring (43) surrounds the outer wall surface of the stator assembly (3), the outer rotor assembly (4) is equipped with rotating shaft (44), and the end of the rotating shaft (44) passes through the mounting platform (1);Bearing (5) is set to the side of the mounting platform (1) away from the control circuit board (21), and the outer circumferential surface of the rotating shaft (44) is rotatably connected with the bearing (5);Wherein, sealing sleeve (6) is provided between the outer rotor assembly (4) and the mounting platform (1), and the sealing sleeve (6) surrounds the outer wall surface of the stator assembly (3) and the outer wall surface of the control circuit board (21). The power supply transmission component includes: power interface (22);One end of the power interface (22) is electrically connected with the control circuit board (21), and the other end of the power interface (22) passes through the sealing sleeve (6). The power interface (22) is a USB power interface.

2. The external rotor brushless motor of claim 1, wherein, The stator assembly (3) includes: iron core (31);The iron core (31) is set on the control circuit board (21), the middle part of the iron core (31) is formed with a cylinder, and the coil winding (32) is wound between the outer wall surface of the iron core (31) and the cylinder;Wherein, the coil winding (32) is electrically connected with the control circuit board (21), and part of the outer circumferential surface of the rotating shaft (44) is surrounded by the inner circumferential surface of the cylinder.

3. The external rotor brushless motor of claim 2, wherein, The coil winding (32) is a three-phase winding structure.

4. The external rotor brushless motor of claim 1, wherein, The outer rotor assembly (4) includes: shell (41);The shell (41) is open on one side, the mounting cavity (42) is formed in the shell (41), the shell (41) is sleeved on the outer wall surface of the iron core (31), the rotating shaft (44) is arranged in the middle part of the bottom wall of the mounting cavity (42), and the magnetic ring (43) is arranged on the inner circumferential surface of the mounting cavity (42).

5. The external rotor brushless motor of claim 4, wherein, The magnetic ring (43) is made of neodymium iron boron.

6. The external rotor brushless motor of claim 4, wherein, ​ 7. The external rotor brushless motor of claim 6, wherein, ​ 8. The external rotor brushless motor of claim 6, wherein: The stator assembly (3) further comprises a spacer sleeve (33), an outer circumferential surface of the spacer sleeve (33) is connected with an inner circumferential surface of the sleeve, a recess (34) is formed in one end of the spacer sleeve (33) facing the shell (41), the rotating shaft (44) is arranged in the spacer sleeve (33), an inner diameter of the spacer sleeve (33) is greater than a diameter of the rotating shaft (44); the outer rotor assembly (4) further comprises a protruding block (45), the protruding block (45) is arranged in a middle portion of a bottom wall of the mounting cavity (42), a top end of the protruding block (45) is connected with one end of the rotating shaft (44) close to the shell (41), a recessed portion (46) is formed in the top end of the protruding block (45), the recessed portion (46) is matched with the spacer sleeve (33); wherein the recessed portion (46) divides the protruding block (45) into a first portion and a second portion, the first portion of the protruding block (45) has a diameter equal to the inner diameter of the spacer sleeve (33), a height of the second portion of the protruding block (45) is greater than a depth of the recess (34).

9. The outer rotor brushless motor according to any one of claims 1 to 8, characterized by The control circuit board (21) is a PCB board.

10. The outer rotor brushless motor of claim 9, wherein, The PCB board is integrally provided with a voltage stabilizing module.

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