Brushless motor and pan-tilt camera with same

Abstract

The utility model discloses a brushless motor. The brushless motor comprises a stator assembly; the rotor assembly comprises a rotating shaft, the rotating shaft penetrates through the stator assembly and can rotate relative to the stator assembly, and internal threads are arranged on the inner side of the rotating shaft; and the encoder assembly comprises a magnetic ring, the magnetic ring is accommodated in a magnetic ring seat, the magnetic ring seat is close to one side, provided with the internal threads, of the rotating shaft, the outer wall of the magnetic ring seat is provided with external threads, and the magnetic ring seat is in threaded connection with the rotating shaft. The magnetic ring seat is arranged in the brushless motor, the magnetic ring is accommodated in the magnetic ring seat, and the magnetic ring seat is matched and connected with the internal thread in the rotating shaft through the external thread arranged on the outer wall of the magnetic ring seat, so that the magnetic ring accommodated in the magnetic ring seat is indirectly connected to the rotating shaft, that is, the magnetic ring is connected to the rotating shaft through the magnetic ring seat, and part of the magnetic ring seat is in threaded connection in the rotating shaft. The flexibility of production and repair can be ensured, and the overall height of the brushless motor in the direction of the rotating shaft can be reduced. The utility model also discloses a pan-tilt camera.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and more specifically to a brushless motor and a gimbal camera having the brushless motor. Background Technology

[0002] A gimbal camera is a camera equipped with a gimbal. It contains a motor that allows the lens to rotate clockwise or counter-clockwise to adjust the shooting direction. In existing technology, the magnetic ring in the motor, which rotates with the rotor to work with a magnetoelectric sensor to measure motor angle and speed, is typically glued directly to the shaft to reduce the overall height of the motor. However, once production and assembly are complete, the structure cannot be modified, hindering flexible production and making rework quite troublesome. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a brushless motor that can reduce the overall height of the motor while ensuring flexible production and repair, as well as a gimbal camera with the brushless motor.

[0004] To solve the above-mentioned technical problems, according to one aspect of this utility model, a brushless motor is provided, comprising:

[0005] Stator assembly;

[0006] The rotor assembly includes a rotating shaft that passes through the stator assembly and is rotatable relative to the stator assembly, and the rotating shaft has an internal thread on its inner side.

[0007] An encoder assembly includes a magnetic ring housed in a magnetic ring holder. The magnetic ring holder has an internal thread on the side near the rotating shaft, and an external thread on the outer wall of the magnetic ring holder for threaded connection to the rotating shaft.

[0008] The further technical solution is as follows: the encoder assembly also includes a magnetoelectric sensor, which is disposed on a PCB board corresponding to the magnetic ring.

[0009] A further technical solution is that the rotor assembly also includes at least one set of bearings disposed on the rotating shaft.

[0010] The further technical solution is as follows: the brushless motor also includes a rear end cover, the rear end cover is located on the side where the rotating shaft is connected to the magnetic ring seat, the magnetic ring seat and the PCB board are disposed inside the rear end cover, the front end of the rear end cover extends outward to form a connecting part, the stator assembly is sleeved on the connecting part, and one end of the rotating shaft passes through the connecting part and is threadedly connected to the magnetic ring seat.

[0011] The further technical solution is as follows: the brushless motor also includes a front end cover, the front end cover is located on the other side of the rotating shaft, and the stator assembly is located inside the front end cover.

[0012] The further technical solution is as follows: the rotor assembly also includes a rotor core and a plurality of permanent magnets disposed on the rotor core, the stator assembly is located inside the rotor core, and the rotor core and the rotating shaft are both fixed inside the front end cover.

[0013] The further technical solution is as follows: the magnetic ring seat includes a seat body and a connecting seat extending outward from the middle of one side of the seat body. The external thread is provided on the outer wall of the connecting seat. The seat body is recessed inward to form an accommodating cavity, and the magnetic ring is fixed in the accommodating cavity.

[0014] The further technical solution is that the rotating shaft has a hollow structure.

[0015] The further technical solution is as follows: the stator assembly includes a stator core, and a plurality of uniformly distributed stator salient poles are formed on the outer circumferential surface of the stator core. A coil is wound on each stator salient pole, and the rotating shaft passes through the stator core.

[0016] To solve the above-mentioned technical problems, according to one aspect of the present invention, a gimbal camera is provided, including a lens module and a gimbal for supporting the lens module, the gimbal including the brushless motor described above, the brushless motor driving the lens module to rotate.

[0017] Compared with the prior art, the brushless motor of this utility model is provided with a magnetic ring seat, in which the magnetic ring is housed. The inner side of the rotor assembly shaft is provided with an internal thread, and the magnetic ring seat is located on the side of the shaft with the internal thread. The outer wall of the magnetic ring seat is provided with an external thread that mates with the internal thread, so that the magnetic ring seat can be threadedly connected to the shaft. That is, the magnetic ring is connected to the shaft through the magnetic ring seat, and part of the magnetic ring seat is threadedly connected to the shaft. This can ensure the flexibility of production and rework, and at the same time reduce the overall height of the brushless motor in the direction of the shaft. Attached Figure Description

[0018] Figure 1 This is an exploded structural diagram of a specific embodiment of the brushless motor of this utility model.

[0019] Figure 2 This is a three-dimensional structural diagram of a specific embodiment of the brushless motor of this utility model.

[0020] Figure 3 yes Figure 2 The diagram shows a cross-sectional view of the brushless motor.

[0021] Reference numerals: 100-Brushless motor; 10-Stator assembly; 11-Stator core; 12-Stator salient pole; 21-Shaft; 211-Internal thread; 22-Rotor core; 23-Bearing; 30-Encoder assembly; 31-Magnetic ring; 32-Magnetic sensor; 40-Magnetic ring seat; 41-External thread; 42-Connecting seat; 43-Seat body; 50-PCB board; 60-Rear end cover; 61-Connecting part; 70-Front end cover. Detailed Implementation

[0022] To enable those skilled in the art to more clearly understand the purpose, technical solution and advantages of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Reference Figures 1 to 3 , Figures 1 to 3 A specific embodiment of the brushless motor 100 of this utility model is shown. In the embodiment shown in the figures, the brushless motor 100 includes a stator assembly 10, a rotor assembly, and an encoder assembly 30. The rotor assembly includes a rotating shaft 21, which passes through the stator assembly 10 and is rotatable relative to the stator assembly 10. The rotating shaft 21 has an internal thread 211 on its inner side. Preferably, in this embodiment, the rotating shaft 21 has a hollow structure, and the internal thread 211 is located at one end of the rotating shaft 21. The encoder assembly 30 includes a magnetic ring 31, which is housed in a magnetic ring seat 40. The magnetic ring seat 40 is located near the side of the rotating shaft 21 where the internal thread 211 is located, and the outer wall of the magnetic ring seat 40 has an external thread 41 for threaded connection to the rotating shaft 21. In this invention, the magnetic ring seat 40 is connected to the internal thread 211 inside the rotating shaft 21 through the external thread 41 on its outer wall, so as to indirectly connect the magnetic ring 31 housed in the magnetic ring seat 40 to the rotating shaft 21, thereby realizing the installation of the magnetic ring 31 in the encoder assembly 30. The threaded connection between the magnetic ring seat 40 and the rotating shaft 21 not only facilitates flexible production and rework, that is, the parts are easy to disassemble and assemble, which is convenient for flexible production and easy to disassemble and maintain during rework, but also reduces the overall height of the brushless motor 100 in the direction of the rotating shaft 21. If the bearing 23 is installed in subsequent use, the bearing 23 can be sleeved on the rotating shaft 21 at the position corresponding to the internal thread 211. That is, when the bearing 23 is sleeved on the rotating shaft 21, its height can coincide with the part where the rotating shaft 21 is connected to the magnetic ring seat 40, sharing the same height, thereby achieving the purpose of reducing the overall height of the brushless motor 100.

[0024] In some embodiments, the encoder assembly 30 further includes a magnetoelectric sensor 32, which is mounted on a PCB board 50 corresponding to the magnetic ring 31. The brushless motor 100 also includes a rear end cover 60, located on the side where the rotating shaft 21 connects to the magnetic ring seat 40. The magnetic ring seat 40 and the PCB board 50 are disposed within the rear end cover 60. A connecting portion 61 extends outward from the center of the front end of the rear end cover 60. The stator assembly 10 is sleeved on the connecting portion 61, and one end of the rotating shaft 21 passes through the connecting portion 61 and is threadedly connected to the magnetic ring seat 40. Based on this design, when the rotating shaft 21 rotates, it can drive the magnetic ring seat 40 to rotate, causing the magnetic ring 31 housed within the magnetic ring seat 40 to rotate. The magnetoelectric sensor 32, mounted on the PCB corresponding to the magnetic ring 31, can sense changes in the angular position of the magnetic ring 31.

[0025] Specifically, continue to refer to Figure 1 and Figure 3 In this embodiment, the magnetic ring seat 40 includes a seat body 43 and a connecting seat 42 extending outward from the middle of one side of the seat body 43. An external thread 41 is disposed on the outer wall of the connecting seat 42. The seat body 43 is recessed inward to form a receiving cavity, and the magnetic ring 31 is fixed within the receiving cavity. Preferably, in this embodiment, the magnetic ring 31 and the magnetic ring seat 40 are installed via an interference fit, meaning the magnetic ring 31 can be tightly secured within the receiving cavity. Alternatively, in some other embodiments, the magnetic ring 31 can be glued to the receiving cavity.

[0026] Furthermore, in some embodiments, to make the rotation of the shaft 21 smoother, at least one bearing 23 is also fitted onto the shaft 21, such as... Figure 1 and Figure 3 As shown, there are two bearings 23, and the two bearings 23 are sequentially sleeved on the rotating shaft 21 so that the rotating shaft 21 is rotatably supported in the connecting part 61.

[0027] In some embodiments, the brushless motor 100 further includes a front end cover 70, which is located on the other side of the rotating shaft 21. It is understood that the dimensions and size of the rear end cover 60 and the front end cover 70 in this invention can be designed according to actual conditions to ensure the overall height of the brushless motor 100. In this embodiment, the rotor assembly further includes a rotor core 22 and a plurality of permanent magnets (not shown in the figure) disposed on the rotor core 22. The stator assembly 10 is located within the rotor core 22. The stator assembly 10 includes a stator core 11, on which a plurality of uniformly distributed stator salient poles 12 are formed. Each stator salient pole 12 is wound with a coil, such as... Figure 1 and Figure 3As shown, the windings are not shown for clarity, and the rotor core 22 is fixed inside the front end cover 70. The end of the rotating shaft 21 away from the magnetic ring seat 40 is fixed inside the front end cover 70. In this invention, multiple permanent magnets can be embedded in the rotor core 22, or they can be attached or glued to the circumference of the rotor core 22 to cooperate with the stator assembly 10, causing the rotor core 22 to rotate when energized. Based on the above design, when the brushless motor 100 is energized, the rotor core 22 rotates, thereby driving the front end cover 70 to rotate, causing the rotating shaft 21 to rotate accordingly. When the brushless motor 100 is applied to a gimbal camera or other electronic devices, it can be connected to the rotating component in the gimbal camera or electronic device through the front end cover 70 or the rotating shaft 21, thereby driving the rotating component to rotate.

[0028] In summary, the brushless motor 100 of this utility model is provided with a magnetic ring seat 40, and the magnetic ring 31 is housed in the magnetic ring seat 40. The external thread 41 on the outer wall of the magnetic ring seat 40 is connected to the internal thread 211 in the rotating shaft 21, so that the magnetic ring 31 housed in the magnetic ring seat 40 is indirectly connected to the rotating shaft 21, thereby realizing the installation of the magnetic ring 31 in the encoder assembly 30. The threaded connection between the magnetic ring seat 40 and the rotating shaft 21 not only facilitates flexible production and rework, but also makes the parts easy to disassemble and assemble, which is convenient for flexible production and easy to disassemble and maintain during rework. At the same time, the position of the bearing 23 when it is sleeved on the rotating shaft 21 coincides with the height of the threaded connection part 61 of the magnetic ring seat 40 and the rotating shaft 21. The magnetic ring 31 is close to the bearing 23, which can reduce the overall height of the brushless motor 100.

[0029] Understandably, this utility model can also provide a gimbal camera, which may include a lens module and a gimbal for supporting the lens module. The gimbal includes a brushless motor as described in the above embodiments, and the brushless motor drives the lens module to rotate. Preferably, when the gimbal is a three-axis gimbal, the brushless motor can be used as a roll axis motor, and the front end cover or shaft of the brushless motor can be connected to the lens module to drive the lens module to rotate.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Those skilled in the art can make various equivalent changes and improvements based on the above embodiments. All equivalent changes or modifications made within the scope of the claims should fall within the protection scope of the present utility model.

Claims

1. A brushless motor, characterized in that, The brushless motor includes: Stator assembly; The rotor assembly includes a rotating shaft that passes through the stator assembly and is rotatable relative to the stator assembly, and the rotating shaft has an internal thread on its inner side. An encoder assembly includes a magnetic ring housed in a magnetic ring holder. The magnetic ring holder has an internal thread on the side near the rotating shaft, and an external thread on the outer wall of the magnetic ring holder for threaded connection to the rotating shaft.

2. The brushless motor as described in claim 1, characterized in that, The encoder assembly also includes a magnetoelectric sensor, which is mounted on a PCB board corresponding to the magnetic ring.

3. The brushless motor as described in claim 1, characterized in that, The rotor assembly also includes at least one set of bearings disposed on the shaft.

4. The brushless motor as described in claim 2, characterized in that, The brushless motor also includes a rear end cover, which is located on the side where the rotating shaft is connected to the magnetic ring seat. The magnetic ring seat and the PCB board are disposed inside the rear end cover. A connecting part is formed by extending outward from the middle of the front end of the rear end cover. The stator assembly is sleeved on the connecting part, and one end of the rotating shaft passes through the connecting part and is threadedly connected to the magnetic ring seat.

5. The brushless motor as described in claim 4, characterized in that, The brushless motor also includes a front cover, which is located on the other side of the shaft, and the stator assembly is located inside the front cover.

6. The brushless motor as described in claim 5, characterized in that, The rotor assembly also includes a rotor core and a plurality of permanent magnets disposed on the rotor core. The stator assembly is located inside the rotor core, and both the rotor core and the shaft are fixed inside the front end cover.

7. The brushless motor as described in claim 1, characterized in that, The magnetic ring seat includes a seat body and a connecting seat extending outward from the middle of one side of the seat body. The external thread is provided on the outer wall of the connecting seat. The seat body is recessed inward to form a receiving cavity, and the magnetic ring is fixed in the receiving cavity.

8. The brushless motor as described in claim 1, characterized in that, The rotating shaft has a hollow structure.

9. The brushless motor as described in claim 1, characterized in that, The stator assembly includes a stator core, on the outer circumferential surface of which a plurality of uniformly distributed stator salient poles are formed, and a coil is wound on each stator salient pole. The rotating shaft passes through the stator core.

10. A gimbal camera, characterized in that, The gimbal camera includes a lens module and a gimbal for supporting the lens module. The gimbal includes a brushless motor as described in any one of claims 1-9, and the brushless motor drives the lens module to rotate.

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