Electric motor

Abstract

Disclosed in the present application are an electric motor, comprising a stator assembly and a rotor assembly. The rotor assembly comprises a rotating shaft, the rotating shaft passing through the stator assembly and being rotatable relative to the stator assembly. An arc-shaped magnet is fixed to an end of the rotating shaft, and a clearance space is formed between the arc-shaped magnet and the end of the rotating shaft. The rotating shaft is further provided with a routing groove for routing a coaxial cable, and after passing through the routing groove, the coaxial cable is bent toward the clearance space and led out. Compared with the prior art, in the electric motor of the present application, an arc-shaped magnet is used instead of a magnetic ring, and the arc-shaped magnet is directly fixed to the end of the rotating shaft to form the clearance space with the end of the rotating shaft, such that coaxial cable passes through the routing groove, is bent toward the clearance space and led out of the electric motor without passing around the arc-shaped magnet, thereby reducing the height of the electric motor in the direction of the rotating shaft and enabling a smaller overall motor size.

Description

A type of motor

[0001] This application is based on and claims priority to Chinese Patent Application No. 202423286289.6, filed on December 30, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to an electric motor. Background Technology

[0003] An electric motor (commonly known as a "motor") is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. In existing technology, the magnetic ring used in the motor to follow the rotor's rotation and cooperate with the electronic speed control board to measure the motor's angle and speed is usually connected to the end of the shaft via a mounting bracket. The magnetic ring protrudes outside the motor, and control lines, power lines, and other wiring are led out from inside the rotor and pass through the magnetic ring before exiting. This results in an increase in the motor's axial dimension, leading to a corresponding increase in the overall size of the motor. Consequently, the overall structural size of products using this motor increases, thus affecting the product's competitiveness. Application content

[0004] The technical problem to be solved by this application is to provide a motor with a smaller overall size.

[0005] To solve the above-mentioned technical problems, this application provides an electric motor, including a stator assembly and a rotor assembly, wherein the rotor assembly includes a rotating shaft, the rotating shaft passes through the stator assembly and can rotate relative to the stator assembly, an arc-shaped magnet is fixed at the end of the rotating shaft, and a gap is formed between the arc-shaped magnet and the end of the rotating shaft, and a wire routing groove is also provided on the rotating shaft for coaxial wires to run, after which the coaxial wires bend towards the gap and pass through.

[0006] A further technical solution is as follows: a control board is installed at the end of the motor near the arc-shaped magnet, the rotating shaft passes through the control board, and multiple sensing sensors are provided on the control board, with the multiple sensing sensors arranged around the arc-shaped magnet.

[0007] A further technical solution is as follows: the control board is mounted on the end of the motor via a connector. The connector includes a cylindrical body and a mounting plate formed by bending outwards from one end of the cylindrical body. The cylindrical body is located inside the stator assembly. The rotating shaft passes through the cylindrical body, and the control board is mounted on the mounting plate.

[0008] The further technical solution is that the sensing sensor is a Hall sensor.

[0009] The further technical solution is as follows: the number of the sensing sensors is three, and the three sensing sensors are evenly spaced and arranged around the arc-shaped magnet.

[0010] A further technical solution is as follows: a mounting portion extends outward from one side of the shaft end, the arc-shaped magnet is fixed to the outer wall of the mounting portion, and the vacancy is formed between the side wall of the mounting portion and the shaft end.

[0011] A further technical solution is that the rotor assembly also includes at least one set of bearings disposed on the rotating shaft.

[0012] The further technical solution is as follows: the motor further includes a housing, the rotor assembly further includes a rotor magnetic ring, the rotor magnetic ring is housed in the housing, the stator assembly is located inside the rotor magnetic ring, and the end of the rotating shaft away from the arc-shaped magnet is fixed in the housing.

[0013] The further technical solution is as follows: a receiving groove is formed by inward indentation at the middle of one end of the housing, and a fixing part is formed by bending outward around the end of the rotating shaft. The fixing part is located in the receiving groove.

[0014] 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.

[0015] The beneficial technical effects of this application are as follows: Compared with the prior art, the end of the rotating shaft of the motor in this application is fixed with an arc-shaped magnet, and a gap is formed between the arc-shaped magnet and the end of the rotating shaft. A wire routing groove is also provided on the rotating shaft for coaxial wires to run. After the coaxial wires run, they bend towards the gap and exit the motor. It can be seen that the motor in this application uses an arc-shaped magnet instead of a magnetic ring, and the arc-shaped magnet is directly fixed to the end of the rotating shaft, forming a gap with the end of the rotating shaft. After the coaxial wires pass through the wire routing groove, they can bend towards the gap and exit the motor without having to go through the arc-shaped magnet and bend again to exit. This can reduce the height of the motor in the direction of the rotating shaft, making the overall size of the motor smaller. Attached Figure Description

[0016] Figure 1 is a structural schematic diagram of a specific embodiment of the motor of this application;

[0017] Figure 2 is an exploded view of the motor shown in Figure 1;

[0018] Figure 3 is a cross-sectional view of the motor shown in Figure 1.

[0019] Reference numerals: 100-Motor; 10-Stator assembly; 11-Stator core; 12-Stator salient pole; 21-Shaft; 211-Gap; 212-Mounting part; 213-Wire routing groove; 214-Fixing part; 22-Rotor magnetic ring; 23-Bearing; 30-Arc magnet; 40-Induction sensor; 50-Coaxial cable; 60-Control board; 70-Housing; 80-Screw; 90-Connector; 91-Cylindrical body; 92-Mounting plate. Detailed Implementation

[0020] To better understand the technical content of this application, the technical solution of this application will be further introduced and explained below with reference to the schematic diagram, but it is not limited thereto.

[0021] Referring to Figures 1 to 3, which illustrate a specific embodiment of the motor 100 of this application. In the embodiment shown in the figures, the motor 100 includes a stator assembly 10 and a rotor assembly. The rotor assembly includes a rotating shaft 21, which passes through the stator assembly 10 and is rotatable relative to the stator assembly 10. An arc-shaped magnet 30 is fixed to the end of the rotating shaft 21, and a gap 211 is formed between the arc-shaped magnet 30 and the end of the rotating shaft 21. A wiring groove 213 is also provided on the rotating shaft 21 for a coaxial cable 50 to run. After the cable is routed, the coaxial cable 50 bends towards the gap 211 and passes through. In this application, the rotating shaft 21 has a hollow structure, that is, the wiring groove 213 is a through groove. The arc-shaped magnet 30, which replaces the magnetic ring, is fixed at the end of the rotating shaft 21, and a gap 211 is formed between the magnet 30 and the end of the rotating shaft 21. The coaxial line 50 passes through the wiring groove 213 and then bends towards the gap 211 to exit the motor 100. It does not need to bend through the arc-shaped magnet 30 to exit, which can reduce the height of the motor 100 in the direction of the rotating shaft 21, making the overall size of the motor 100 smaller. When applied to small products such as handheld gimbals, it optimizes the overall size of the product in the case of limited product space, which can increase the product competitiveness.

[0022] As shown in Figures 2 and 3, in this embodiment, a mounting portion 212 extends outward from one end of the rotating shaft 21, and the arc-shaped magnet 30 is fixed to the outer wall of the mounting portion 212. The vacancy 211 is formed between the side wall of the mounting portion 212 and the end of the rotating shaft 21. Preferably, after the coaxial cable 50 passes through the wiring groove 213, it can be bent and passed out into the vacancy 211 opposite to the arc-shaped magnet 30, which is more conducive to wiring.

[0023] In some embodiments, the motor 100 further includes a housing 70, with a receiving groove recessed inward at one end of the housing 70. The rotor assembly further includes a rotor magnetic ring 22, which is housed within the housing 70. The stator assembly 10 is located within the rotor magnetic ring 22 and includes a stator core 11. A plurality of uniformly distributed stator salient poles 12 are formed on the outer circumferential surface of the stator core 11. A coil can be wound on each stator salient pole 12. The shaft 21 extends outward from the end away from the arcuate magnet 30 to form a fixing part 214, which is located within the receiving groove to secure the connection between the shaft 21 and the housing 70. In this application, the rotor magnetic ring 22 is a permanent magnet that works with the stator assembly 10. When energized, the rotor magnetic ring 22 rotates, thereby driving the housing 70 to rotate, causing the rotating shaft 21 to rotate as well. When the motor 100 is applied to a gimbal camera or other electronic devices, it can be connected to the rotating part in the gimbal camera or electronic device through the housing 70 or the rotating shaft 21, thereby driving the rotating part to rotate.

[0024] In some embodiments, a control board 60 is also installed at the end of the motor 100 near the arc-shaped magnet 30. The rotating shaft 21 passes through the control board 60, and three sensing sensors 40, which can be Hall sensors, are disposed on the control board 60. The three sensing sensors 40 are evenly spaced and surround the arc-shaped magnet 30. Based on the above design, the Hall sensors sense changes in the magnetic field and cooperate with the arc-shaped magnet 30 to measure the rotation angle and speed of the motor 100.

[0025] Specifically, as shown in Figures 2 and 3, the control board 60 is mounted on the end of the motor 100 near the arc-shaped magnet 30 via a connector 90. The connector 90 includes a cylindrical body 91 and a mounting plate 92 formed by bending outwards from one end of the cylindrical body 91. Referring to Figure 1, the control board 60 can be fixed to the mounting plate 92 by screws 80. The cylindrical body 91 is located inside the stator core 11 and is sleeved on the outside of the rotating shaft 21. Furthermore, in order to make the rotating shaft 21 rotate more smoothly, at least one bearing 23 is also sleeved on the rotating shaft 21. In this embodiment, there are two bearings 23, which are sequentially sleeved on the rotating shaft 21 so that the rotating shaft 21 is rotatably supported inside the cylindrical body 91.

[0026] In summary, the motor in this application uses an arc-shaped magnet instead of the circular magnetic ring in traditional motors. The arc-shaped magnet is directly fixed to the end of the shaft, eliminating the need for an additional mounting base connected to the shaft. A gap is also formed between the arc-shaped magnet and the end of the shaft. After the coaxial cable passes through the cable tray, it can bend towards the gap and exit the motor without having to go through the mounting base and the arc-shaped magnet again. This reduces the height of the motor in the shaft direction and shrinks the motor size. When applied to small products such as handheld gimbals, it optimizes the product size and structure under limited product space, thereby increasing product competitiveness.

[0027] The above preferred embodiments should be regarded as illustrative examples of the embodiments of the present application. Any technical deductions, substitutions, improvements, etc. that are similar to or based on the present application should be considered within the scope of protection of this patent.

Claims

1. An electric motor, characterized in that, The motor includes a stator assembly and a rotor assembly. The rotor assembly includes a rotating shaft that passes through the stator assembly and can rotate relative to the stator assembly. An arc-shaped magnet is fixed at the end of the rotating shaft, and a gap is formed between the arc-shaped magnet and the end of the rotating shaft. A wire routing groove is also provided on the rotating shaft for coaxial wires to run. After the wires are routed, the coaxial wires bend towards the gap and pass through.

2. The motor as described in claim 1, characterized in that, A control board is also installed at the end of the motor near the arc-shaped magnet. The rotating shaft passes through the control board, and multiple sensing sensors are provided on the control board, which are arranged around the arc-shaped magnet.

3. The motor as described in claim 2, characterized in that, The control board is mounted on the end of the motor via a connector. The connector includes a cylindrical body and a mounting plate that bends outward from one end of the cylindrical body. The cylindrical body is located inside the stator assembly. The rotating shaft passes through the cylindrical body, and the control board is mounted on the mounting plate.

4. The motor as described in claim 2, characterized in that, The sensing sensor is a Hall sensor.

5. The motor as described in claim 4, characterized in that, The number of sensing sensors is three, and the three sensing sensors are evenly spaced and arranged around the arc-shaped magnet.

6. The motor as described in claim 1, characterized in that, A mounting portion extends outward from one side of the shaft end, the arc-shaped magnet is fixed to the outer wall of the mounting portion, and the vacancy is formed between the side wall of the mounting portion and the shaft end.

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

8. The motor as described in claim 1, characterized in that, The motor also includes a housing, the rotor assembly includes a rotor magnetic ring housed within the housing, the stator assembly is located within the rotor magnetic ring, and the end of the shaft away from the arc-shaped magnet is fixed within the housing.

9. The motor as described in claim 8, characterized in that, The housing has an inwardly recessed groove at one end, and the shaft has a fixing part that bends outward around its end and is located within the groove.

10. The 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.

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