Galvanometer motor

Abstract

The galvanometer motor comprises a drive-by-wire unit, a shell unit and a lens unit which are connected in sequence, the shell unit comprises a shell, a stator assembly and a rotor assembly, the stator assembly and the rotor assembly are arranged in the shell, the stator assembly comprises a stator and a coil, and the coil is nested on the stator and packaged with the stator through glue pouring; the rotor assembly comprises a rotating shaft and a magnetic column arranged on the rotating shaft, the rotating shaft penetrates through the coil, and at least one end of the rotating shaft penetrates through the coil; when the rotating shaft is arranged in the coil in a penetrating mode, the magnetic column is located in the coverage range of the coil, a magnetic air gap is formed between the coil and the magnetic column, and the magnetic air gap is smaller than 1.1 mm. According to the galvanometer motor, the coil is nested on the stator and is encapsulated with the stator through glue pouring, so that a magnetic air gap between the coil and the magnetic column is reduced, the size of the motor can be reduced, the output torque and dynamic response of the galvanometer motor are improved, and the overall reliability of the galvanometer motor is improved; the coil and the stator are packaged through glue pouring, so that the insulating property of the coil, the overall mechanical strength of the stator assembly, the stability of the stator assembly and the service life of the stator assembly are improved.

Description

Technical Field

[0001] The present application relates to the field of galvanometer scanning, and in particular to a galvanometer motor. Background Art

[0002] Galvanometer motors are a special type of motor that uses the principle of vibration to achieve motion and can be widely used in various fields such as optics, communications, medical treatment, radar, laser processing, etc., which can achieve fast and accurate motion control. In general, galvanometer motors have important application value in various fields that require optical signal conditioning, laser beam control, optical imaging and optical signal processing.

[0003] In LiDAR, galvanometer motors are widely used in scanning systems to scan the direction and position of laser beams. The galvanometer motor can achieve fast and accurate scanning of the laser beam by controlling the vibration of the galvanometer, thereby realizing three-dimensional perception and measurement of the surrounding environment. With the development of LiDAR technology, the requirements for LiDAR are constantly increasing, especially for the size and reliability of LiDAR. As an important part of LiDAR, the galvanometer motor is still large in size, and the output torque needs to be improved. It cannot adapt to some special working conditions, which has a great impact on LiDAR. Therefore, this field urgently needs a galvanometer motor with small size and high performance. Summary of the invention

[0004] In response to the technical problems existing in the prior art, the present application proposes a galvanometer motor, which can effectively reduce the magnetic air gap between the stator coil and the rotor magnetic column by changing the structure of the stator assembly, thereby reducing the volume of the motor, reducing the excitation current, and improving the power factor of the galvanometer motor, thereby improving the output torque and dynamic response of the galvanometer motor and improving the overall reliability of the galvanometer motor; the glue encapsulation of the coil and the stator improves the insulation performance of the coil, the overall mechanical strength of the stator assembly, and the stability and service life of the stator assembly.

[0005] The galvanometer motor includes: a wire control unit, a shell unit and a lens unit connected in sequence, the shell unit includes a shell, a stator assembly and a rotor assembly are arranged inside the shell, the stator assembly includes a stator and a coil, the coil is nested on the stator and is encapsulated with glue; the rotor assembly includes a rotating shaft and a magnetic column arranged on the rotating shaft, the rotating shaft is passed through the coil, and at least one end passes through the coil; when the rotating shaft is passed through the coil, the magnetic column is located within the coverage range of the coil, and a magnetic air gap is included between the coil and the magnetic column, and the magnetic air gap is less than 1.1 mm.

[0006] In the galvanometer motor as described above, both ends of the rotating shaft are rotatably fixed in the housing via a first bearing and a second bearing respectively.

[0007] In the galvanometer motor as described above, the first end of the housing is connected to the bearing seat, the first bearing is arranged in the bearing seat, and the second bearing is arranged in the housing and close to the second end of the housing.

[0008] In the galvanometer motor as described above, the bearing seat includes a boss, which can extend into the first end of the shell and has an interference fit with the shell; an adhesive layer is also provided between the outer wall of the boss and the inner wall of the shell.

[0009] As described above, the galvanometer motor comprises one or more first connection holes on the surface of the bearing seat away from the boss, which are configured to be connected to the wire control unit.

[0010] In the galvanometer motor as described above, the rotor assembly further comprises: a limiting transverse shaft radially penetrated and interference-connected to the rotating shaft, and located at one end of the rotating shaft passing through the coil.

[0011] As for the galvanometer motor as described above, the second end of the shell is fixedly connected to the limiting washer, and the limiting washer blocks and limits the axial position of the second bearing; a limiting groove is provided on the limiting washer, and the limiting horizontal axis passes through the second end of the shell and is accommodated in the limiting groove to form a limiting mechanism.

[0012] As described above, the galvanometer motor, the limiting washer also includes a through hole and one or more second connecting holes, the through hole is located in the middle of the limiting washer, for accommodating the passage of the rotating shaft; the limiting groove includes a first groove and a second groove arranged opposite to each other at the upper and lower parts, and extends from the through hole to the outside of the limiting washer, for accommodating the limiting horizontal axis; the second connecting hole is used for fixing the limiting washer to the outer shell.

[0013] The galvanometer motor as described above further comprises: a connecting ring, which is arranged on a side of the limiting washer away from the housing, and the connecting ring at least partially covers the first groove and the second groove.

[0014] In the galvanometer motor as described above, the stator is a magnetic ring.

[0015] The galvanometer motor of the present application can effectively reduce the magnetic air gap between the stator coil and the rotor magnetic column by changing the structure of the stator assembly, thereby reducing the volume of the motor, reducing the excitation current, and improving the power factor of the galvanometer motor, thereby improving the output torque and dynamic response of the galvanometer motor and improving the overall reliability of the galvanometer motor; the glue encapsulation of the coil and the stator improves the insulation performance of the coil, the overall mechanical strength of the stator assembly, and the stability and service life of the stator assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Below, the preferred embodiments of the present application will be further described in detail with reference to the accompanying drawings, wherein:

[0017] Figure 1 This is a schematic diagram of the overall structure of a galvanometer motor according to an embodiment of the present application;

[0018] Figure 2 is a cross-sectional view of a galvanometer motor according to an embodiment of the present application;

[0019] Figure 3 An exploded diagram of a galvanometer motor according to an embodiment of the present application;

[0020] Figure 4 An exploded view of a housing unit according to an embodiment of the present application;

[0021] Figure 5 is a schematic diagram of a stator assembly according to an embodiment of the present application; and

[0022] Figure 6 It is a schematic diagram of a limiting horizontal axis according to an embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] In the following detailed description, reference may be made to the various specification drawings that are part of the present application and are used to illustrate specific embodiments of the present application. In the accompanying drawings, similar reference numerals describe substantially similar components in different figures. The various specific embodiments of the present application are described below in sufficient detail so that a person of ordinary skill in the art with relevant knowledge and skills in the art can implement the technical solutions of the present application. It should be understood that other embodiments may also be used or structural, logical or electrical changes may be made to the embodiments of the present application.

[0025] In the description of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, if the terms "first", "second", etc. appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0026] The present application proposes a new type of galvanometer motor. By optimizing the structure of the galvanometer motor, the overall size of the galvanometer motor can be reduced, and the magnetic air gap between the stator coil and the rotor magnetic column of the galvanometer motor can be reduced, which can effectively reduce the excitation current, improve the power factor of the galvanometer motor and the torque of the galvanometer motor, thereby improving the dynamic response of the galvanometer motor.

[0027] The technical solution of the present application is further described below through specific implementation methods. Those skilled in the art should understand that the following description is only for the convenience of understanding the technical solution of the present application and should not be used to limit the protection scope of the present application.

[0028] Figure 1 Schematic diagram of the overall structure of a galvanometer motor according to an embodiment of the present application. Figure 2 It is a cross-sectional view of a galvanometer motor according to one embodiment of the present application. Figure 3 An exploded diagram of a galvanometer motor according to an embodiment of the present application.

[0029] like Figures 1 to 3 As shown, the galvanometer motor 100 includes: a wire control unit 110, a shell unit 120 and a lens unit 130 connected in sequence, wherein the wire control unit 110 can be used to control the rotation of the galvanometer motor, a rotor assembly and a stator assembly are arranged inside the shell unit 120, and the wire control unit 110 controls the rotor assembly to rotate in the stator assembly, and the lens unit 130 is connected to the rotor assembly and is used to manipulate the light beam of the laser radar transmitting end.

[0030] As mentioned above, the housing unit is an important component for the galvanometer motor to generate rotation or torque, and it occupies a large volume of the galvanometer motor. The present application improves the structure of the housing unit to reduce the size of the galvanometer motor and improve the torque and dynamic response of the galvanometer motor. Among them, the wire control unit and the lens unit can be any existing structure, which will not be repeated here.

[0031] Figure 4 FIG. 1 is an exploded view of a housing unit according to an embodiment of the present application. Figure 4Combined with Figure 1 , Figure 2 As shown, in some embodiments, the housing unit 120 includes a stator assembly 121, a rotor assembly 122 and a housing 123, wherein the stator assembly 121 is disposed in the housing 123 and is used to generate a static magnetic field, and the rotor assembly 122 is disposed in the stator assembly 121, so that when the rotor assembly generates a magnetic field, the interaction between the rotor assembly and the magnetic field of the stator assembly generates a torque, thereby causing the rotor assembly to rotate.

[0032] Figure 5 FIG. 1 is a schematic diagram of a stator assembly according to an embodiment of the present application. Figure 5 Combined with Figure 2 As shown, in some embodiments, the stator assembly 121 includes a stator 1211 and a coil 1212. The coil 1212 is nested in the stator 1211. In some embodiments, the coil 1212 and the stator 1211 can be encapsulated by glue potting, the surface of the coil 1212 can be glue-sealed, and the coil and the stator can be glued and fixed to each other, which is beneficial to protecting the coil, and can improve the insulation performance of the coil, the overall mechanical strength of the stator assembly, and the stability and service life of the stator assembly.

[0033] Combination Figure 5 As shown, in some embodiments, the shape of the stator 1211 can be an annular cylinder, which includes a through hole inside and runs through the entire stator, so that the coil 1212 can be placed in the stator 1211. In some embodiments, the internal through hole of the stator 1211 can also be a non-equal diameter structure, for example: the diameter near the two ends of the stator is smaller, and the diameter near the middle part of the stator is larger. The coil is arranged in the middle part of the stator, and the diameter at both ends of the through hole is smaller, so that the coil can be limited and fixed. In some embodiments, the material of the stator can be a magnetic conductive material. For example: electrical pure iron, low carbon steel, magnetic conductive stainless steel, nickel alloy, etc., which is conducive to reducing magnetic resistance, reducing eddy current loss, hysteresis loss and leakage of magnetic field, and can improve the utilization rate and magnetic efficiency of the magnetic field, so that the galvanometer motor can reduce the volume under the same power, improve the compactness of the galvanometer motor design, and can also improve the mechanical strength, heat resistance and heat dissipation capacity of the stator assembly, which is conducive to the galvanometer motor to adapt to harsh working conditions.

[0034] In some embodiments, the coil 1212 includes a plurality of wires arranged in a mutually arranged manner, and the plurality of wires are connected end to end and laid on the inner wall of the stator through hole. Figure 5As shown, according to one embodiment of the present application, two coils 1212 are laid relatively on the inner wall of the through hole inside the stator 1211, which is conducive to quickly and accurately controlling the rotation of the rotor assembly, and can also improve the control accuracy, reduce electromagnetic interference, and optimize the motor performance to meet the different movement requirements of the galvanometer motor. In some embodiments, in some embodiments, the wire is an enameled wire, which can ensure the electrical performance of the coil, is conducive to the insulation between adjacent wires in the coil, and prevents short circuits from affecting the normal use of the galvanometer motor. In some embodiments, the multiple wires of the coil 1212 are bonded to each other, which is conducive to improving the mechanical strength of the coil.

[0035] like Figure 2 Combined with Figure 4 As shown, in some embodiments, the rotor assembly 122 includes a rotating shaft 1221 and a magnetic column 1222 disposed on the rotating shaft 1221, wherein the rotating shaft 1221 is inserted into the coil 1212, and at least one end thereof passes through the coil 1212. In some embodiments, one end of the rotating shaft 1221 passing through the coil 1212 may be connected to a lens unit, so that the lens unit may be controlled to manipulate the laser beam.

[0036] In some embodiments, when the rotating shaft 1221 is inserted into the coil 1212, the magnetic column 1222 is located within the range covered by the coil, and a magnetic air gap is included between the coil and the magnetic column, which can isolate the stator assembly and the rotor assembly, prevent the rotor assembly from rubbing or colliding during rotation, protect the galvanometer motor from damage, and is beneficial to the heat dissipation and cooling of the galvanometer motor, as well as reducing the noise and vibration of the galvanometer motor, so that the galvanometer motor can adapt to different working conditions. In some embodiments, the spacing of the magnetic air gap can be less than 1.1mm. Compared with the existing galvanometer motor, the magnetic air gap of the galvanometer motor of the present application is optimized and reduced by 0.5-1mm, which can reduce the volume of the galvanometer motor, reduce the excitation current, and improve the power factor, thereby improving the dynamic response of the galvanometer motor.

[0037] According to an embodiment of the present application, when the length of the motor of the present application is shortened by 4 mm and the outer diameter of the magnetic column remains unchanged, the torque of multiple galvanometer motors is tested, as shown in Tables 1 and 2. Table 1 shows the torque test results of multiple existing galvanometer motors, and Table 2 shows the torque test results of multiple galvanometer motors of the present application.

[0038] Table 1

[0039]

[0040] Table 2

[0041]

[0042] As shown in Table 1 and Table 2, the torque of the existing galvanometer motor is 4.7-5.7 mN·m, with an average of 5.5 mN·m; while the torque of the galvanometer motor of the present application is 6-7 mN·m, with an average of 6.2 mN·m. Therefore, it can be concluded that the torque of the galvanometer motor of the present application can be increased by about 12.7% while being smaller in size than the existing galvanometer motor.

[0043] like Figure 2 As shown, in some embodiments, the two ends of the rotating shaft 1221 are rotatably fixed in the housing 123 by the first bearing 101 and the second bearing 102 respectively, and a magnetic air gap is retained between the magnetic column 1222 and the coil 1212, so as to facilitate the rotation of the rotating shaft in the stator coil. In some embodiments, the first bearing and the second bearing can be arranged at the two ends of the housing 123, which is convenient for the installation of the galvanometer motor and is conducive to the precise control of the spacing of the magnetic air gap. According to one embodiment of the present application, the first bearing 101 can be arranged in the bearing seat 103, one end of the bearing seat 103 is connected to the first end of the housing, and the other end is connected to the wire control unit, which is conducive to the installation and assembly of the galvanometer motor, and because the relative position of the bearing seat remains unchanged, the concentricity of the bearing seat and the housing can remain unchanged, thereby improving the concentricity of the parts in the galvanometer motor.

[0044] In some embodiments, the bearing seat 103 may include a bearing cavity 1031, which can be used to connect the first bearing 101 and part of the rotating shaft. In some embodiments, the bearing seat 103 may also include a perforation 1032, which is connected to the bearing cavity 1031 and passes through the bearing seat 103, which can be used to accommodate the rotating shaft passing through and extending into the wire control unit, which is conducive to the wire control unit to detect the rotation of the rotating shaft, thereby accurately controlling the movement of the galvanometer motor. In some embodiments, the bearing seat 103 may include a boss 1033, which can extend into one end of the housing and be connected to the housing by interference fit, so as to adjust the concentricity of various structures of the galvanometer motor during the installation of the galvanometer motor. In some embodiments, an adhesive layer may be included between the boss 1033 and the inner wall of the housing to fix the bearing seat and the housing and determine the relative position between the bearing seat and the housing. In some embodiments, the bearing seat 103 may also include one or more connecting holes 1034, which are arranged on the surface away from the boss side and can be used to connect the wire control unit.

[0045] In some embodiments, the second bearing 102 may also be disposed in the bearing seat and connected to the second end of the housing. According to one embodiment of the present application, the second bearing 102 is disposed in the housing and close to the second end of the housing. By using the second bearing connected to the fixed housing, the magnetic air gap between the magnetic column and the coil can be effectively ensured, and the position of the rotor assembly can be easily determined, which is beneficial to the installation and assembly of the galvanometer motor.

[0046] like Figure 3Combined with Figure 4 As shown, in some embodiments, the housing unit may further include a limiting device, which may be disposed at the second end of the housing and may limit the axial position of the second bearing and the rotation angle of the rotating shaft. In some embodiments, the limiting device may include: a limiting transverse axis 104 and a limiting washer 105. The limiting transverse axis 104 may be disposed at one end of the rotating shaft that passes through the coil and is connected to the lens unit, and the limiting washer may be fixedly connected to the second end of the housing to limit the axial position of the second bearing and accommodate the limiting transverse axis 104 to limit the rotation position of the rotating shaft, which is beneficial to optimizing the use function of the limiting device, facilitating the assembly of the second bearing, and optimizing the assembly cost of the galvanometer motor.

[0047] Figure 6 Schematic diagram of a limiting horizontal axis according to an embodiment of the present application. In some embodiments, the limiting horizontal axis 104 is radially penetrated on the rotating shaft and is connected with the rotating shaft in an interference fit manner, which is convenient for the installation and assembly of the limiting horizontal axis. In some embodiments, the limiting horizontal axis 104 may also be a part of the rotating shaft or rotor assembly. For example: the limiting horizontal axis is integrally formed with the rotating shaft, and forms a limiting structure of the galvanometer motor with a limiting washer provided on the housing. In some embodiments, the limiting horizontal axis 104 is cylindrical in shape, and includes a horizontal axis body 1041, and includes a through hole 1042 passing through the horizontal axis body 1041. In some embodiments, the horizontal axis body 1041 may also include an opening 1043, which passes through at least part of the side wall of the horizontal axis body 1041 and is connected to the through hole 1042, which is conducive to pressing the limiting horizontal axis to change the diameter of the limiting horizontal axis, and is convenient for the limiting horizontal axis to be pressed onto the rotating shaft, which can improve the yield rate of the galvanometer motor. In some embodiments, the limiting horizontal axis may be an elastic cylindrical pin.

[0048] like Figure 4 As shown, in some embodiments, the limiting washer 105 includes a washer body 1051 and a through hole 1052, a limiting groove 1053 and one or more connecting holes 1054 arranged on the washer body 1051, wherein the through hole 1052 is arranged in the middle of the washer body and can be used to accommodate the rotation shaft passing through, the limiting groove is connected to the through hole 1052 and is used to accommodate the limiting horizontal axis radially arranged on the rotation shaft, and the connecting hole 1054 is arranged at the edges of the washer body 1051 and is used to limit the washer and the housing for fixed connection. In some embodiments, the limiting groove 1053 may include grooves arranged opposite to each other up and down, and the groove extends from the through hole 1052 to the outside of the washer body.

[0049] In some embodiments, the limiting washer 105 is connected to the second end of the housing by a connecting member 106. In some embodiments, the connecting member 106 can be a bolt. In some embodiments, the limiting device can also include a connecting ring 107, which is arranged on the side of the limiting washer away from the housing and is connected to the connecting member 106, and the limiting washer can be clamped between the housing and the connecting ring. In some embodiments, the connecting ring 107 includes one or more connecting holes 1071, which can be used to cooperate with the connecting member 106. In some embodiments, the connecting ring 107 at least covers a portion of the limiting groove 1053, which can be used to limit the axial position of the limiting horizontal axis accommodated in the limiting groove.

[0050] In some embodiments, the housing 123 is cylindrical in shape, and includes a housing body and a fixing plate 1232 that is tangentially protruding along the outer periphery of the housing body, so that the galvanometer motor is fixedly connected to an external device (such as a laser emitting end). Since the galvanometer motor manipulates the laser beam through the lens unit, in order to make the irradiation range of the laser beam after the lens in the lens unit reflects the laser beam within a preset range, the angle between the fixing plate and the lens action surface should meet the accuracy requirements of a certain angle, and the accuracy requirement is that the allowable deviation does not exceed 1°. In some embodiments, the housing 123 may also include a plurality of cavities for accommodating the above-mentioned components of the housing unit. Including but not limited to: a stator assembly cavity for accommodating a stator assembly, a bearing seat cavity for accommodating a bearing seat, and a bearing cavity for accommodating a second bearing. In some embodiments, the housing 123 can be integrally formed. For example, die casting, extrusion molding, etc., facilitate the production of the housing 123 and reduce manufacturing costs. In some embodiments, the housing 123 also needs to be machined. For example: machining a plurality of different cavities in the housing, etc. In some embodiments, the material of the housing is a non-magnetic material. For example, aluminum alloy, stainless steel, etc. can be used for electromagnetic shielding, which is beneficial to reduce magnetic field interference, reduce costs, improve efficiency, reliability and heat dissipation performance, thereby improving the overall performance and life of the galvanometer motor.

[0051] The galvanometer motor of the present application can effectively reduce the magnetic air gap between the stator coil and the rotor magnetic column by changing the structure of the stator assembly, thereby reducing the volume of the motor, reducing the excitation current, and improving the power factor of the galvanometer motor, thereby improving the output torque and dynamic response of the galvanometer motor and improving the overall reliability of the galvanometer motor; the glue encapsulation of the coil and the stator improves the insulation performance of the coil, the overall mechanical strength of the stator assembly, and the stability and service life of the stator assembly.

[0052] The above embodiments are only used to illustrate the present application, and are not intended to limit the present application. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the scope of the present application. Therefore, all equivalent technical solutions should also fall within the scope of the present application.

Claims

1. A galvanometer motor, comprising: A wire control unit, a housing unit and a lens unit connected in sequence, wherein the housing unit comprises a housing, and a stator assembly and a rotor assembly are arranged inside the housing, characterized in that the stator assembly comprises a stator and a coil, and the coil is nested on the stator and encapsulated with the stator by glue; the rotor assembly comprises a rotating shaft and a magnetic column arranged on the rotating shaft, and the rotating shaft is arranged in the coil, and at least one end of the rotating shaft passes through the coil; When the rotating shaft passes through the coil, the magnetic column is located within the coverage range of the coil, and a magnetic air gap is included between the coil and the magnetic column, and the magnetic air gap is smaller than 1.1 mm.

2. The galvanometer motor according to claim 1, characterized in that: Both ends of the rotating shaft are rotatably fixed in the housing via a first bearing and a second bearing respectively.

3. The galvanometer motor according to claim 2, characterized in that: The first end of the housing is connected to the bearing seat, the first bearing is arranged in the bearing seat, and the second bearing is arranged in the housing and close to the second end of the housing.

4. The galvanometer motor according to claim 3, characterized in that: The bearing seat comprises a boss which can extend into the first end of the shell and has an interference fit with the shell; an adhesive layer is also provided between the outer wall of the boss and the inner wall of the shell.

5. The galvanometer motor according to claim 4, characterized in that: The surface of the bearing seat away from the boss includes one or more first connection holes, which are configured to be connected to the wire control unit.

6. The galvanometer motor according to claim 3, characterized in that: The rotor assembly further comprises: a limiting transverse shaft radially penetrated and interference-connected on the rotating shaft, and located at one end of the rotating shaft passing through the coil.

7. The galvanometer motor according to claim 6, characterized in that: The second end of the shell is fixedly connected to a limiting washer, and the limiting washer blocks and limits the axial position of the second bearing; a limiting groove is provided on the limiting washer, and the limiting horizontal axis passes through the second end of the shell and is accommodated in the limiting groove to form a limiting mechanism.

8. The galvanometer motor according to claim 7, characterized in that: The limiting washer also includes a through hole and one or more second connecting holes. The through hole is located in the middle of the limiting washer and is used to accommodate the passage of the rotating shaft. The limiting groove includes a first groove and a second groove that are arranged opposite to each other at the upper and lower parts, and extend from the through hole to the outside of the limiting washer to accommodate the limiting horizontal axis. The second connecting hole is used to fix the limiting washer to the outer shell.

9. The galvanometer motor according to claim 8, characterized in that: Further including: A connecting ring is arranged on a side of the limiting washer away from the housing, and the connecting ring at least partially covers the first groove and the second groove.

10. The galvanometer motor according to claim 1, characterized in that: The stator is a magnetic conductive ring.

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