Galvanometer motor and laser engraving equipment

Abstract

The invention discloses a galvanometer motor and laser engraving equipment, and relates to the technical field of laser engraving, and the galvanometer motor comprises a shell, a rotor assembly, a first bearing, a second bearing and an elastic piece; the rotor assembly comprises a rotating shaft and a magnet arranged on the rotating shaft; the first bearing and the second bearing are arranged in the shell in the axial direction of the rotating shaft at intervals and arranged at the two ends of the rotating shaft in a sleeving mode correspondingly. The elastic piece is arranged on the periphery of the first bearing and / or the second bearing in a sleeving mode, located between the inner circumferential wall of the shell and the outer circumferential wall of the first bearing and / or the second bearing and used for applying axial pre-tightening force to the first bearing and / or the second bearing. According to the technical scheme, the stability of the galvanometer motor can be improved.

Description

Technical Field

[0001] This invention relates to the field of laser engraving technology, and in particular to a galvanometer motor and a laser engraving device. Background Technology

[0002] Laser engraving, due to its wide range of applications and advantages such as fast response speed, high engraving speed, and high engraving precision, has become a mainstream product with broad application prospects. The galvanometer motor is a core component of a laser engraving machine. To meet the high-speed operation and high-precision characteristics of engraving machines, new requirements have been placed on the galvanometer motor, among which improving its stability is crucial. Summary of the Invention

[0003] The main objective of this invention is to propose a galvanometer motor and laser engraving equipment, which aims to improve the stability of the galvanometer motor.

[0004] To achieve the above objectives, the present invention proposes a galvanometer motor, comprising: case; A rotor assembly includes a shaft and a magnet disposed on the shaft; The first bearing and the second bearing are disposed at intervals along the axial direction of the rotating shaft within the housing and are respectively sleeved on both ends of the rotating shaft; An elastic element is sleeved on the outer periphery of the first bearing and / or the second bearing, and located between the inner peripheral wall of the housing and the outer peripheral wall of the first bearing and / or the second bearing, for applying axial preload to the first bearing and / or the second bearing.

[0005] In one embodiment, the elastic element includes a first elastic segment, a second elastic segment, a first connecting segment, and a second connecting segment. The first connecting segment connects a first end of the first elastic segment and a third end of the second elastic segment, and the second connecting segment connects a second end of the first elastic segment and a fourth end of the second elastic segment. The first elastic segment bends radially toward the housing from the first connecting segment along the axis of rotation and extends axially toward the first direction. The second elastic segment bends radially from the first connecting segment toward the direction close to the housing along the axis of rotation, and then extends axially along the axis of rotation in a second direction opposite to the first direction.

[0006] In one embodiment, the elastic element includes a first elastic element and a second elastic element. The first elastic element is sleeved on the outer periphery of the first bearing and located between the inner peripheral wall of the housing and the outer peripheral wall of the first bearing. The second elastic element is sleeved on the outer periphery of the second bearing and located between the inner peripheral wall of the housing and the outer peripheral wall of the second bearing.

[0007] In one embodiment, the rotating shaft includes a first rotating shaft and a second rotating shaft coaxially arranged, the first bearing is sleeved on the first rotating shaft, and the second bearing is sleeved on the second rotating shaft; the magnet is located between the first bearing and the second bearing, and is coaxially connected to the first rotating shaft and the second rotating shaft.

[0008] In one embodiment, one of the first rotating shaft and the magnet is provided with a first positioning protrusion, and the other is provided with a first positioning groove that coaxially engages with the first positioning protrusion; one of the second rotating shaft and the magnet is provided with a second positioning protrusion, and the other is provided with a second positioning groove that coaxially engages with the second positioning protrusion; and / or The first rotating shaft includes a first shaft segment and a second shaft segment connected to each other, and the first bearing is sleeved on the outer periphery of the second shaft segment; the outer diameter of the first shaft segment is larger than the outer diameter of the second shaft segment, and a limiting step is formed between the first shaft segment and the second shaft segment, and the limiting step is limited to the side of the first bearing away from the second bearing.

[0009] In one embodiment, one of the housing and the first bearing is provided with a first limiting part, and the other is provided with a first limiting engagement part that engages with the first limiting part to limit the axial movement of the first bearing along the rotating shaft.

[0010] In one embodiment, the housing has a first cavity and a second cavity that are sequentially connected along the axial direction of the rotating shaft. The width of the first cavity along a third direction is greater than the width of the second cavity along a third direction. The first limiting portion is a first step formed between the first cavity and the second cavity. The first bearing includes a first bearing segment and a second bearing segment connected to each other. The outer diameter of the first bearing segment is greater than the outer diameter of the second bearing segment. The first limiting fitting portion is a third step formed between the first bearing segment and the second bearing segment. The third step abuts against the first step.

[0011] In one embodiment, one of the housing and the second bearing is provided with a second limiting part, and the other is provided with a second limiting engagement part that engages with the second limiting part to limit the axial movement of the second bearing along the rotating shaft.

[0012] In one embodiment, the housing has a second cavity and a third cavity that are sequentially connected along the axial direction of the rotating shaft; the width of the second cavity along a third direction is smaller than the width of the third cavity along a third direction, and the second limiting portion is a second step formed between the second cavity and the third cavity; the second bearing includes a third bearing segment and a fourth bearing segment connected to each other, the outer diameter of the third bearing segment is smaller than the outer diameter of the fourth bearing segment, and the second limiting fitting portion is a fourth step formed between the third bearing segment and the fourth bearing segment, the fourth step abutting against the second step.

[0013] In one embodiment, the compression amount of the elastic element is determined by the following formula: ; Wherein, δ is the compression amount of the elastic element, F is the preload provided by the elastic element, h is the free height of the elastic element, k is the structural coefficient related to the shape of the elastic element, E is the elastic modulus of the material of the elastic element, b is the width of the elastic element, and t is the thickness of the elastic element.

[0014] The present invention also proposes a laser engraving device, including the galvanometer motor described above.

[0015] The technical solution of this invention effectively reduces friction and wobbling during rotor assembly rotation by installing a rotor assembly within the housing of a galvanometer motor and axially supporting both ends of the shaft with a first bearing and a second bearing, respectively. Simultaneously, an elastic element is fitted around the outer periphery of the first and / or second bearings, located between the inner wall of the housing and the outer wall of the first and / or second bearings, to apply axial preload to the first and / or second bearings. This structural design allows the axial preload provided by the elastic element to achieve dynamic balance with the axial load force borne by the first and / or second bearings, thereby suppressing axial movement and radial vibration when the rotor assembly deflects at high speed under magnetic field drive. Therefore, it not only improves the motion stability and positioning accuracy of the rotor assembly during deflection but also enhances the overall dynamic response capability and resistance to external mechanical interference of the galvanometer motor. Compared to existing technologies that suffer from slow response, positioning deviation, and poor anti-interference capabilities due to loose bearings or excessive axial clearance, this invention, through the aforementioned structure of setting up a double bearing to support the rotating shaft within the housing and configuring an elastic element on the outer periphery of the bearing to apply axial preload, can achieve higher precision, faster speed, and stronger stability in laser scanning control, thus meeting the performance requirements of laser engraving equipment for high-speed, high-precision, and high-stability galvanometer motors. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a partial structural schematic diagram of an embodiment of the galvanometer motor provided by the present invention; Figure 2 This is a schematic diagram of a structure of an embodiment of the galvanometer motor provided by the present invention; Figure 3 A front view of an embodiment of the elastic element provided by the present invention; Figure 4 This is a top view of an embodiment of the elastic element provided by the present invention.

[0018] Explanation of icon numbers: 100. Galvanometer motor; 10. Shell; 101. First cavity; 102. Second cavity; 103. Third cavity; 20. Rotor assembly; 21. Shaft; 211. First shaft; 2111. First shaft segment; 2112. Second shaft segment; 2113. Limiting step; 212. Second shaft; 22. Magnet; 30. First bearing; 31. First bearing section; 32. Second bearing section; 40. Second bearing; 41. Third bearing section; 42. Fourth bearing section; 50. Elastic element; 51. First elastic segment; 511. First end; 512. Second end; 52. Second elastic segment; 521. Third end; 522. Fourth end; 53. First connecting segment; 54. Second connecting segment; 60. First positioning protrusion; 601. First positioning groove; 70. Second positioning protrusion; 602. Second positioning groove; 80. Stator assembly; 200. Galvanometer assembly.

[0019] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] This invention proposes a galvanometer motor 100.

[0022] Please see Figures 1 to 4 In one embodiment of the present invention, the galvanometer motor 100 includes: Casing 10; The rotor assembly 20 includes a rotating shaft 21 and a magnet 22 disposed on the rotating shaft 21; The first bearing 30 and the second bearing 40 are disposed at intervals along the axial direction of the rotating shaft 21 within the housing 10, and are respectively sleeved on both ends of the rotating shaft 21; The elastic element 50 is sleeved on the outer periphery of the first bearing 30 and / or the second bearing 40, and is located between the inner peripheral wall of the housing 10 and the outer peripheral wall of the first bearing 30 and / or the second bearing 40, for applying axial preload to the first bearing 30 and / or the second bearing 40.

[0023] The galvanometer motor 100 of this invention is used in laser engraving equipment, which can be a laser engraving machine, laser marking machine, etc. This invention will be described using a laser engraving machine as an example. A laser engraving machine may include a housing, a laser, a galvanometer assembly 200, a galvanometer motor 100, and a control component. The housing is provided with a carrier plate for supporting the object to be engraved; the laser is fixed inside the housing and used to emit a laser beam; the galvanometer assembly 200 includes a scanning galvanometer, which reflects the laser beam emitted by the laser onto the carrier plate; the galvanometer motor 100, controlled by the control component, drives the scanning galvanometer to move and causes the reflected laser beam to perform laser engraving on the surface of the object to be engraved on the carrier plate.

[0024] Understandably, laser engraving, due to its wide range of applications and advantages such as fast response speed, high engraving speed, and high engraving precision, has become a mainstream product with broad application prospects. The galvanometer motor 100 is a core component of the laser engraving machine. To meet the high-speed operation and high-precision characteristics of the engraving machine, new requirements have been placed on the galvanometer motor 100. Among these, improving the stability of the galvanometer motor 100 is crucial.

[0025] Existing galvanometer motors 100 typically use a single bearing or a double bearing without preload to support the rotating shaft 21. During high-speed deflection, the rotor assembly 20 is prone to slight movement or vibration due to axial clearance or bearing loosening, which in turn affects the positioning accuracy and dynamic response performance of the scanning galvanometer. The problem of insufficient stability is even more obvious in environments with frequent start-stop or external disturbances.

[0026] To address this challenge, the galvanometer motor 100 proposed in this invention includes a housing 10, a rotor assembly 20, a stator assembly 80, a first bearing 30, and a second bearing 40. The rotor assembly 20 includes a rotating shaft 21 and a magnet 22. The rotating shaft 21 is used to connect the scanning galvanometer, and there are many ways to connect the rotating shaft 21 and the scanning galvanometer. For example, the rotating shaft 21 may have a connecting hole, and the scanning galvanometer may have a connecting rod. The connecting rod passes through the connecting hole, thereby fixing the scanning galvanometer to the rotating shaft 21. Thus, when the rotating shaft 21 rotates, it can drive the scanning galvanometer to rotate, allowing the reflected laser beam to perform laser engraving on the surface of the object to be engraved on the carrier plate. The magnet 22 may include a magnet, a permanent magnet, etc., and is disposed on the rotating shaft 21. The stator assembly 80 may include a coil, the number of turns of which is not limited here. The coil is sleeved on the outer periphery of the magnet 22 and can be electrically connected to the control assembly. When the control signal output by the control assembly is received, the coil generates a changing magnetic field to drive the magnet 22 and the shaft 21 connected to it to deflect, thereby achieving precise control of the scanning galvanometer angle.

[0027] To improve the operational stability of the galvanometer motor 100, the first bearing 30 and the second bearing 40 are axially spaced within the housing 10 along the shaft 21 and respectively fitted onto both ends of the shaft 21, providing rotational support for the rotor assembly 20, effectively reducing friction and limiting radial displacement. Simultaneously, elastic elements 50 are fitted around the outer periphery of the first bearing 30 and / or the second bearing 40. For example, elastic elements 50 may be fitted only around the outer periphery of the first bearing 30, or only around the outer periphery of the second bearing 40, or both the first bearing 30 and the second bearing 40 may have elastic elements 50. The number of elastic elements 50 fitted onto either the first bearing 30 or the second bearing 40 can be one, two, or even more, depending on the actual design requirements. The elastic elements 50 may include elastic sheets, springs, or other structural forms; the specific type is not limited here. It is worth noting that the elastic elements 50 are located between the inner peripheral wall of the housing 10 and the outer peripheral wall of the first bearing 30 and / or the second bearing 40, and are used to apply axial preload to the first bearing 30 and / or the second bearing 40. Since the elastic element 50 is compressed and installed in the annular space between the inner peripheral wall of the housing 10 and the outer peripheral wall of the first bearing 30 and / or the second bearing 40, the elastic restoring force generated by it will act on the outer ring of the first bearing 30 and / or the second bearing 40 along the axial direction of the rotating shaft 21, thereby pressing the first bearing 30 and / or the second bearing 40 together and forming an axial constraint on the rotor assembly 20.

[0028] The axial preload is balanced with the axial load borne by the first bearing 30 and / or the second bearing 40 during operation. This is because, in the design of the galvanometer motor 100 of the present invention, the axial preload F required by the elastic element 50 is first determined based on the total axial load requirement for the overall operation of the galvanometer motor 100. This axial preload F is set to two to five percent of the load level that the selected first bearing 30 and / or the second bearing 40 can safely withstand under static conditions. Based on this, and combined with the specific parameters of the elastic element 50, including the structural coefficient k, elastic modulus E, width b, thickness t, and free height h, the compression amount δ of the elastic element 50 in the installed state is calculated by using the formula δ = F multiplied by the cube of h divided by k multiplied by E multiplied by b multiplied by the cube of t. This compression amount is ensured to be within a reasonable range of ten percent to thirty percent of the free height h of the elastic element 50. If the calculated compression amount δ exceeds this range, the structural parameters of the elastic element 50 need to be adjusted. For example, the thickness t or width b may be changed, or the material may be replaced to adjust the elastic modulus E. This will achieve a match between the preload and the compression amount, ensuring the stability and precision requirements of the fit between the elastic element 50 and the bearing. Therefore, the design process starts with the preload requirement and adjusts the geometry or material properties of the elastic element 50 in reverse to meet the established engineering specifications.

[0029] To further explain, this design method, which uses load requirements to deduce the structural parameters of the elastic element 50, ensures that the axial preload of the elastic element 50 is neither too small to effectively constrain the rotor assembly 20, nor too large to cause additional wear or jamming of the first bearing 30 and / or the second bearing 40. Therefore, even when the galvanometer motor 100 frequently starts and stops or is subjected to external vibration interference, the rotor assembly 20 can still maintain a stable axial position, avoiding response lag or positioning deviation caused by clearance. Precise control of the axial preload not only helps improve the angular repeatability and trajectory consistency of the scanning galvanometer during laser deflection, but also significantly reduces engraving errors caused by mechanical loosening or dynamic instability. This is particularly important for high-precision laser engraving applications. Furthermore, reasonable selection and parameter configuration of the elastic element 50 also helps reduce the risk of fatigue failure during long-term operation, extends the service life of the galvanometer motor 100, and reduces maintenance frequency. In summary, through the systematic design and optimization of the elastic element 50 and its key parameters, the present invention can suppress the axial movement of the rotor assembly 20 during high-speed deflection, improve the stability and repeatability of the whole machine operation, and thus enhance the anti-interference capability and dynamic response consistency of the galvanometer motor 100 under complex working conditions.

[0030] In the above design, the axial preload provided by the elastic element 50 is a key factor in ensuring that the first bearing 30 and the second bearing 40 support the rotor assembly 20 and suppress axial movement. However, in practical applications, the galvanometer motor 100 is not in an ideal static environment, especially under the conditions of high acceleration and high dynamic response in laser engraving, its operating state is affected by the overall structure and external connection conditions. Therefore, the actual impact of the externally applied axial force F_ext on the preload effect must also be considered. The galvanometer motor 100 is usually mounted on the mounting base of the laser engraving machine. During high-speed deflection, the rapid start-stop and direction switching of the rotor assembly 20 will generate axial inertial force; at the same time, the constraint of the mounting base on the motor housing 10 and the traction of the connecting cable will also introduce additional axial load. These factors together cause part of the axial preload originally applied to the bearing by the elastic element 50 to be shared by the mounting base or connection interface, thereby changing the actual axial load state borne by the first bearing 30 and / or the second bearing 40.

[0031] Therefore, in the design of this invention, the total axial load F_total is defined as the sum of the minimum axial preload F_Min provided by the elastic element 50 and the externally applied axial force F_ext. F_ext consists of two parts: F_int, which is the inertial force generated by the galvanometer motor 100 during axial acceleration, equal to the mass of the moving part multiplied by the acceleration; and F_ca, which is the slight additional tensile force that may exist in the overall structure of the laser engraving machine, such as the force caused by cable tension or residual assembly stress. By controlling F_total within two to five percent of the selected bearing's rated static load C0a, sufficient axial constraint can be ensured to maintain high-precision deflection, while overload can be avoided to prevent bearing wear or jamming.

[0032] The total axial load F_total, acting as a key design parameter on the first bearing 30 and / or the second bearing 40, directly affects the dynamic performance and long-term reliability of the galvanometer motor 100. Therefore, during the selection phase, it is necessary to ensure that the selected first bearing 30 and / or second bearing 40 can continuously withstand the total axial load F_total without adversely affecting its rotational accuracy and service life.

[0033] like Figures 1 to 4 As shown, in one embodiment, the elastic member 50 includes a first elastic segment 51, a second elastic segment 52, a first connecting segment 53, and a second connecting segment 54. The first connecting segment 53 connects the first end 511 of the first elastic segment 51 and the third end 521 of the second elastic segment 52. The second connecting segment 54 connects the second end 512 of the first elastic segment 51 and the fourth end 522 of the second elastic segment 52. The first elastic segment 51 is bent from the first connecting segment 53 in the radial direction of the rotating shaft 21 toward the direction close to the housing 10, and then extends in the axial direction of the rotating shaft 21 toward a first direction. The second elastic segment 52 is bent from the first connecting segment 53 in the radial direction of the rotating shaft 21 toward the direction close to the housing 10, and then extends in the axial direction of the rotating shaft 21 toward a second direction opposite to the first direction.

[0034] In this embodiment, the elastic element 50 has a symmetrical structure. Its first elastic segment 51 and second elastic segment 52 extend axially to both sides from the first connecting segment 53 and the second connecting segment 54, respectively, forming two elastic arms distributed along the axis of the rotating shaft 21. When the elastic element 50 is installed in the annular space between the inner peripheral wall of the housing 10 and the outer peripheral wall of the first bearing 30 and / or the second bearing 40, the first elastic segment 51 and the second elastic segment 52 undergo elastic deformation due to radial compression, thereby applying an axial preload to the outer ring of the first bearing 30 and / or the second bearing 40 through their axially extended portions. Since the first elastic segment 51 and the second elastic segment 52 extend in opposite directions, their deformation trends are coordinated, which helps to achieve uniform and stable axial constraint within a limited space. At the same time, the first connecting segment 53 and the second connecting segment 54, as a transverse connecting structure, not only maintain the overall rigidity of the elastic element 50, but also provide a common force reference for the first elastic segment 51 and the second elastic segment 52, making the preload distribution more balanced. This structural design can improve assembly reliability and long-term stability while ensuring sufficient flexible stroke, thereby effectively supporting the requirements of the galvanometer motor 100 for the axial position accuracy and dynamic response consistency of the rotor assembly 20 under high-speed deflection conditions.

[0035] like Figures 1 to 4 As shown, in one embodiment, the elastic member 50 includes a first elastic member 50 and a second elastic member 50. The first elastic member 50 is sleeved on the outer periphery of the first bearing 30 and located between the inner peripheral wall of the housing 10 and the outer peripheral wall of the first bearing 30. The second elastic member 50 is sleeved on the outer periphery of the second bearing 40 and located between the inner peripheral wall of the housing 10 and the outer peripheral wall of the second bearing 40.

[0036] In this embodiment, the first elastic element 50 and the second elastic element 50 apply axial preload to the first bearing 30 and the second bearing 40, respectively, so that the rotor assembly 20 is elastically constrained at both ends of the axial direction. Since the first bearing 30 and the second bearing 40 are spaced apart along the axial direction of the shaft 21 and support both ends of the shaft 21, the arrangement of the first elastic element 50 and the second elastic element 50 allows the shaft 21 to be axially positioned on both sides. This configuration helps to balance the axial load generated by electromagnetic drive or external disturbance during high-speed deflection of the rotor assembly 20, and reduces the slight tilting or swaying caused by unilateral force concentration or gap accumulation. At the same time, the first elastic element 50 and the second elastic element 50 can be independently designed according to the force characteristics of their respective positions, for example, by adjusting their stiffness or compression, to more accurately match the overall dynamic performance requirements of the galvanometer motor 100. This not only improves the axial stability of the rotor assembly 20 during operation, but also helps maintain the fitting accuracy between the first bearing 30 and the second bearing 40 and the rotating shaft 21, thereby enhancing the positioning repeatability, dynamic response characteristics and anti-interference ability of the galvanometer motor 100 under complex working conditions.

[0037] like Figures 1 to 4 As shown, in one embodiment, the rotating shaft 21 includes a first rotating shaft 211 and a second rotating shaft 212 coaxially arranged, a first bearing 30 is sleeved on the first rotating shaft 211, and a second bearing 40 is sleeved on the second rotating shaft 212; the magnet 22 is located between the first bearing 30 and the second bearing 40, and is coaxially connected to the first rotating shaft 211 and the second rotating shaft 212.

[0038] In this embodiment, by designing the first rotating shaft 211 and the second rotating shaft 212 as coaxial and ensuring that the magnet 22 is also coaxially connected to both, more precise rotation control and higher mechanical stability can be achieved. This coaxial configuration allows the magnet 22 to maintain good balance when driven by an external magnetic field to deflect at high speed, reducing vibration and wear caused by eccentricity or misalignment. Furthermore, since the first bearing 30 and the second bearing 40 respectively support the first rotating shaft 211 and the second rotating shaft 212, their coaxiality ensures the concentric operation of the rotor assembly 20 as a whole, further improving the dynamic response speed and positioning accuracy of the galvanometer motor 100. When the magnet 22 rotates rapidly under the action of electromagnetic force, the centrifugal force it generates can be evenly distributed under the combined action of the first bearing 30 and the second bearing 40, thereby avoiding additional friction or structural deformation caused by uneven force on one side. This not only helps extend the service life of the equipment but also improves the angular repeatability and trajectory consistency of the scanning galvanometer, which is particularly important for applications requiring high-precision laser engraving. Therefore, by carefully designing the coaxial relationship between the first rotating shaft 211, the second rotating shaft 212, and the magnet 22, the present invention can effectively enhance the overall performance of the galvanometer motor 100 and its reliability under complex working conditions.

[0039] like Figures 1 to 4 As shown, in one embodiment, one of the first rotating shaft 211 and the magnet 22 is provided with a first positioning protrusion 60, and the other is provided with a first positioning groove 601 that is coaxially inserted and engaged with the first positioning protrusion 60; one of the second rotating shaft 212 and the magnet 22 is provided with a second positioning protrusion 70, and the other is provided with a second positioning groove 602 that is coaxially inserted and engaged with the second positioning protrusion 70.

[0040] In this embodiment, by providing a first positioning protrusion 60 and a first positioning groove 601 that cooperate with each other between the first rotating shaft 211 and the magnet 22, and by providing a second positioning protrusion 70 and a second positioning groove 602 that cooperate with each other between the second rotating shaft 212 and the magnet 22, the magnet 22 can be accurately positioned between the first rotating shaft 211 and the second rotating shaft 212, ensuring that the three maintain a good coaxial relationship after assembly. This plug-in fit structure not only simplifies the assembly process between the first rotating shaft 211, the second rotating shaft 212, and the magnet 22, but also limits the relative displacement of the magnet 22 in the radial and circumferential directions, avoiding rotational imbalance caused by loosening or misalignment. Since the first positioning protrusion 60 and the first positioning groove 601, and the second positioning protrusion 70 and the second positioning groove 602 are all aligned along the same axis, when the magnet 22 is deflected by electromagnetic drive, its rotation center is highly consistent with the geometric axis of the rotating shaft 21, thereby reducing unnecessary vibration and inertial interference. This design helps improve the stability and angle control accuracy of the galvanometer motor 100 during high-speed operation, while also enhancing the overall structural reliability and consistency of repeated assembly.

[0041] like Figures 1 to 4 As shown, in one embodiment, the first rotating shaft 211 includes a first shaft segment 2111 and a second shaft segment 2112 connected to each other, and a first bearing 30 is sleeved on the outer periphery of the second shaft segment 2112; the outer diameter of the first shaft segment 2111 is larger than the outer diameter of the second shaft segment 2112, and a limiting step 2113 is formed between the first shaft segment 2111 and the second shaft segment 2112, and the limiting step 2113 is limited to the side of the first bearing 30 away from the second bearing 40.

[0042] In this embodiment, by designing the outer diameter of the first shaft segment 2111 to be larger than that of the second shaft segment 2112, and forming a limiting step 2113 at their junction, the end face of the first bearing 30, after being axially installed onto the second shaft segment 2112, can abut against the limiting step 2113, thereby restricting the first bearing 30 from moving further toward the second bearing 40. This structure eliminates the need for additional independent axial limiting components, simplifying the assembly structure, while ensuring that the first bearing 30 maintains a stable axial position even when subjected to preload applied by the elastic element 50 or dynamic loads during operation. The fit between the limiting step 2113 and the end face of the first bearing 30 also helps maintain the overall axial reference consistency of the rotor assembly 20, reducing yaw or vibration caused by bearing movement, thereby improving the operational stability and angle control accuracy of the galvanometer motor 100 under high-speed deflection conditions.

[0043] like Figures 1 to 4As shown, in one embodiment, one of the housing 10 and the first bearing 30 is provided with a first limiting part, and the other is provided with a first limiting engagement part that engages with the first limiting part to limit the axial movement of the first bearing 30 along the rotating shaft 21.

[0044] In this embodiment, by providing a first limiting part and a first limiting fit part that cooperate with each other between the housing 10 and the first bearing 30, the axial position of the first bearing 30 is constrained after assembly, making it difficult for it to displace axially along the shaft 21. This fit method can prevent the first bearing 30 from axially moving due to the preload of the elastic element 50, external vibration, or dynamic load during operation without relying on additional fasteners. For example, when a protrusion structure is provided on the inner peripheral wall of the housing 10 as the first limiting part, a groove can be provided on the outer peripheral wall of the first bearing 30 as the first limiting fit part, or vice versa, so that the two form a stable axial stop after assembly. This limiting fit, which is directly formed by the housing 10 and the bearing body, helps to maintain the overall axial reference consistency of the rotor assembly 20, reduces eccentricity or wobbling caused by bearing displacement, thereby improving the running stability, angular repeatability accuracy, and long-term reliability of the galvanometer motor 100 during high-speed deflection.

[0045] like Figures 1 to 4 As shown, in one embodiment, the housing 10 has a first cavity 101 and a second cavity 102 that are sequentially connected along the axial direction of the rotating shaft 21. The width of the first cavity 101 along the third direction is greater than the width of the second cavity 102 along the third direction. The first limiting part is a first step formed between the first cavity 101 and the second cavity 102. The first bearing 30 includes a first bearing segment 31 and a second bearing segment 32 that are connected to each other. The outer diameter of the first bearing segment 31 is greater than the outer diameter of the second bearing segment 32. The first limiting fitting part is a third step formed between the first bearing segment 31 and the second bearing segment 32. The third step abuts against the first step.

[0046] In this embodiment, a first cavity 101 and a second cavity 102 with different widths are designed within the housing 10, and a first step is formed at their junction as a first limiting part. Simultaneously, a first bearing segment 31 and a second bearing segment 32 with different outer diameters are provided on the first bearing 30, and a third step is formed at their junction as a first limiting mating part. When the first bearing 30 is installed into the housing 10, the third step abuts against the first step, thereby restricting the axial movement of the first bearing 30 along the rotating shaft 21. This design not only ensures the stability of the first bearing 30 in its predetermined position but also avoids inconvenience caused by additional fasteners or complex assembly processes. Furthermore, since no additional fixing device is needed to maintain the position of the first bearing 30, this not only reduces the number of parts in the galvanometer motor 100 but also reduces its assembly difficulty, making the entire manufacturing process more efficient.

[0047] like Figures 1 to 4 As shown, in one embodiment, one of the housing 10 and the second bearing 40 is provided with a second limiting part, and the other is provided with a second limiting engagement part that engages with the second limiting part to limit the axial movement of the second bearing 40 along the rotating shaft 21.

[0048] In this embodiment, by providing a mutually cooperating second limiting part and a second limiting fit part between the housing 10 and the second bearing 40, the axial position of the second bearing 40 is effectively constrained after assembly, making it difficult for it to displace axially along the shaft 21. This fit method can prevent the second bearing 40 from axially moving during operation due to the preload applied by the elastic element 50, the electromagnetic drive reaction force, or external vibration without relying on additional fastening structures. For example, when a protrusion or step is provided on the inner wall of the housing 10 corresponding to the position of the second bearing 40 as a second limiting part, a matching groove or step can be provided on the outer periphery of the second bearing 40 as a second limiting fit part, or vice versa, so that the two form a stable axial stop after assembly. This limiting fit, which is directly formed by the housing 10 and the body of the second bearing 40, helps to maintain the overall axial alignment of the rotor assembly 20, reduces swaying or dynamic instability caused by bearing loosening, and thus further improves the running stability, angular repeatability accuracy, and long-term reliability of the galvanometer motor 100 under high-speed deflection conditions.

[0049] like Figures 1 to 4 As shown, in one embodiment, the housing 10 has a second cavity 102 and a third cavity 103 that are sequentially connected along the axial direction of the rotating shaft 21; the width of the second cavity 102 along the third direction is smaller than the width of the third cavity 103 along the third direction, and the second limiting part is a second step formed between the second cavity 102 and the third cavity 103; the second bearing 40 includes a third bearing segment 41 and a fourth bearing segment 42 that are connected to each other, the outer diameter of the third bearing segment 41 is smaller than the outer diameter of the fourth bearing segment 42, and the second limiting mating part is a fourth step formed between the third bearing segment 41 and the fourth bearing segment 42, and the fourth step abuts against the second step.

[0050] In this embodiment, a second cavity 102 and a third cavity 103 with different widths are designed within the housing 10, and a second step is formed at their junction as a second limiting part. Simultaneously, a third bearing segment 41 and a fourth bearing segment 42 with different outer diameters are provided on the second bearing 40, and a fourth step is formed at their junction as a second limiting mating part. When the second bearing 40 is installed into the housing 10, the fourth step is in close contact with the second step, thereby restricting the movement of the second bearing 40 along the axial direction of the rotating shaft 21. This structural design not only ensures the stability of the second bearing 40 in its predetermined position but also avoids the inconvenience caused by additional fasteners or complex assembly processes. Furthermore, this structure simplifies the assembly process of the galvanometer motor 100, improves production efficiency, and allows the second bearing 40 to be naturally positioned and accurately abut against the second step when installed into the housing 10, without the need for additional adjustment or auxiliary fixing, thereby enhancing the overall assembly consistency and operational performance of the galvanometer motor 100.

[0051] This invention also proposes a laser engraving device, which includes a galvanometer motor 100. The specific structure of the galvanometer motor 100 is as described in the above embodiments. Since this laser engraving device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The laser engraving device can be a laser engraving machine, a laser marking machine, etc. This invention uses a laser engraving machine as an example for description. The laser engraving machine can include a housing, a laser, a galvanometer assembly 200, a galvanometer motor 100, and a control component. The housing is provided with a carrier plate for carrying the object to be engraved; the laser is fixed inside the housing and used to emit a laser beam; the galvanometer assembly 200 includes a scanning galvanometer, which reflects the laser beam emitted by the laser to the carrier plate; the galvanometer motor 100, based on the control of the control component, drives the scanning galvanometer to move and causes the reflected laser beam to perform laser engraving on the surface of the object to be engraved on the carrier plate.

[0052] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A galvanometer motor, characterized in that, include: case; A rotor assembly includes a shaft and a magnet disposed on the shaft; The first bearing and the second bearing are disposed at intervals along the axial direction of the rotating shaft within the housing and are respectively sleeved on both ends of the rotating shaft; An elastic element is sleeved on the outer periphery of the first bearing and / or the second bearing, and located between the inner peripheral wall of the housing and the outer peripheral wall of the first bearing and / or the second bearing, for applying axial preload to the first bearing and / or the second bearing.

2. The galvanometer motor as described in claim 1, characterized in that, The elastic element includes a first elastic segment, a second elastic segment, a first connecting segment, and a second connecting segment. The first connecting segment connects a first end of the first elastic segment and a third end of the second elastic segment, and the second connecting segment connects a second end of the first elastic segment and a fourth end of the second elastic segment. The first elastic segment bends radially toward the housing from the first connecting segment along the axis of rotation and extends axially toward the first direction. The second elastic segment bends radially toward the housing from the first connecting segment along the axis of rotation and extends axially toward a second direction opposite to the first direction.

3. The galvanometer motor as described in claim 1, characterized in that, The elastic element includes a first elastic element and a second elastic element. The first elastic element is sleeved on the outer periphery of the first bearing and located between the inner peripheral wall of the housing and the outer peripheral wall of the first bearing. The second elastic element is sleeved on the outer periphery of the second bearing and located between the inner peripheral wall of the housing and the outer peripheral wall of the second bearing.

4. The galvanometer motor as described in claim 1, characterized in that, The rotating shaft includes a first rotating shaft and a second rotating shaft arranged coaxially, with the first bearing sleeved on the first rotating shaft and the second bearing sleeved on the second rotating shaft; the magnet is located between the first bearing and the second bearing and is coaxially connected to the first rotating shaft and the second rotating shaft.

5. The galvanometer motor as described in claim 4, characterized in that, One of the first rotating shaft and the magnet is provided with a first positioning protrusion, and the other is provided with a first positioning groove that coaxially engages with the first positioning protrusion; one of the second rotating shaft and the magnet is provided with a second positioning protrusion, and the other is provided with a second positioning groove that coaxially engages with the second positioning protrusion; and / or The first rotating shaft includes a first shaft segment and a second shaft segment connected to each other, and the first bearing is sleeved on the outer periphery of the second shaft segment; the outer diameter of the first shaft segment is larger than the outer diameter of the second shaft segment, and a limiting step is formed between the first shaft segment and the second shaft segment, and the limiting step is limited and engaged with the side of the first bearing away from the second bearing.

6. The galvanometer motor as described in claim 1, characterized in that, One of the housing and the first bearing is provided with a first limiting part, and the other is provided with a first limiting engagement part that engages with the first limiting part to restrict the axial movement of the first bearing along the rotating shaft.

7. The galvanometer motor as described in claim 6, characterized in that, The housing has a first cavity and a second cavity that are sequentially connected along the axial direction of the rotating shaft. The width of the first cavity along a third direction is greater than the width of the second cavity along a third direction. The first limiting part is a first step formed between the first cavity and the second cavity. The first bearing includes a first bearing segment and a second bearing segment that are connected to each other. The outer diameter of the first bearing segment is greater than the outer diameter of the second bearing segment. The first limiting fitting part is a third step formed between the first bearing segment and the second bearing segment. The third step abuts against the first step.

8. The galvanometer motor as described in claim 1, characterized in that, One of the housing and the second bearing is provided with a second limiting part, and the other is provided with a second limiting part that limits and cooperates with the second limiting part, so as to restrict the axial movement of the second bearing along the rotating shaft.

9. The galvanometer motor as described in claim 8, characterized in that, The housing has a second cavity and a third cavity that are sequentially connected along the axial direction of the rotating shaft; the width of the second cavity along the third direction is smaller than the width of the third cavity along the third direction, and the second limiting part is a second step formed between the second cavity and the third cavity; the second bearing includes a third bearing segment and a fourth bearing segment connected to each other, the outer diameter of the third bearing segment is smaller than the outer diameter of the fourth bearing segment, and the second limiting fitting part is a fourth step formed between the third bearing segment and the fourth bearing segment, and the fourth step abuts against the second step.

10. The galvanometer motor as described in any one of claims 1 to 9, characterized in that, The compression amount of the elastic element is determined by the following formula: ； Wherein, δ is the compression amount of the elastic element, F is the preload provided by the elastic element, h is the free height of the elastic element, k is the structural coefficient related to the shape of the elastic element, E is the elastic modulus of the material of the elastic element, b is the width of the elastic element, and t is the thickness of the elastic element.

11. A laser engraving device, characterized in that, Includes the galvanometer motor as described in any one of claims 1 to 10.

Images