Laser scanning digital galvanometer motor feedback structure and galvanometer motor

Abstract

The utility model discloses a laser scanning digital galvanometer motor feedback structure and a galvanometer motor in the technical field of galvanometer motors, the feedback structure comprises a motor rear cover, a motor shell, a motor shaft, a photoelectric plate, a grating disc, a reading head and a screw, the motor rear cover directly or indirectly covers a rear opening of the cylindrical motor shell; the photoelectric plate is perpendicular to the axis of the cylinder body and is arranged between the motor shaft and the motor rear cover, a gap is reserved between the photoelectric plate and the motor shaft, the grating disc is directly or indirectly arranged on the motor shaft by using a screw and coaxially rotates with the motor shaft, and the reading head is welded on the photoelectric plate by facing a track of the grating disc and also keeps a gap with the motor shaft. The grating disc is directly or indirectly fixed on the rear end face of the motor shaft by taking the axis point of the grating disc as the center of circle, the scheme solves the problem of poor fixation of the grating disc and the motor shaft in the prior art, and achieves the beneficial effects of enhancing the stability, improving the performance and simplifying the structure.

Description

Technical Field

[0001] This application relates to the field of galvanometer motor technology, specifically to a laser scanning digital galvanometer motor feedback structure and galvanometer motor. Background Technology

[0002] Existing technologies for galvanometer motor feedback structures utilize a combination of light-emitting diodes (LEDs), photovoltaic cells, and sector plates to detect motor position. The basic principle is that different rotor positions cause the light-shielding plate to block the light source's illumination area, resulting in changes in the photocurrent of the photodetector. Position measurement is achieved by detecting the magnitude of this photocurrent. However, this type of solution uses adhesive bonding between the sector plates and the motor shaft, leading to low reliability. Furthermore, the numerous motor components make assembly and debugging complex and difficult, increasing energy loss and vibration noise, resulting in low production efficiency, increased material and process costs, and indirectly increased inventory costs and management difficulties. Subsequent solutions have adopted optical encoders, which use photoelectric conversion to transform the mechanical geometric displacement on the output shaft into pulse or digital signals. An optical encoder consists of a light source, a code disk, and a photosensitive element. The code disk is a circular plate of a certain diameter with several rectangular holes evenly spaced. Because the photoelectric encoder disk is coaxial with the motor, the grating disk rotates at the same speed as the motor when it rotates. The detection device composed of light-emitting diodes and other electronic components detects and outputs several pulse signals. By calculating the number of pulses output by the photoelectric encoder per second, the current speed of the motor can be reflected. However, when assembling the grating disk and the motor shaft, a single screw center fixing scheme is usually adopted, such as the galvanometer motor disclosed in patent documents with publication numbers CN101083423B, CN206894369U, and CN208782590U. In this type of scheme, even if thread glue is added, the connection between the grating disk and the motor shaft is inevitably prone to loosening under the continuous rotation of the shaft. There are also schemes that use side locking or make the shaft head very large, with the encoder disk attached to the shaft head. These schemes are prone to causing imbalance in the rotation of the shaft. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this application provides a laser scanning digital galvanometer motor feedback structure and galvanometer motor to solve the problem of poor fixation between the grating disk and the motor shaft in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] A laser scanning digital galvanometer motor feedback structure includes a motor rear cover, a motor housing, a motor shaft, and a photoelectric plate. The motor rear cover directly or indirectly covers the rear opening of the cylindrical motor housing. The rear part of the motor shaft is installed parallel to the axis of the cylindrical body on the rear side of the motor housing. The photoelectric plate is installed perpendicular to the axis of the cylindrical body between the motor shaft and the motor rear cover, with a gap between them. The structure also includes a grating disk, a reading head, and screws. The grating disk is directly or indirectly mounted on the motor shaft using screws and rotates coaxially with the motor shaft. The reading head is welded to the photoelectric plate with its track facing the grating disk, also with a gap between it and the motor shaft. More than two screws are used to symmetrically and evenly fix the grating disk directly or indirectly to the rear end face of the motor shaft with the grating disk axis as the center.

[0006] Preferably, it also includes a grating tray, wherein the grating disk is fixed to the rear end face of the motor shaft by the grating tray, and the grating disk is coaxial with the grating tray and installed on the side of the grating tray facing the photoelectric plate.

[0007] Preferably, the screw threads are coated with a non-stick adhesive.

[0008] Preferably, the contact surface between the grating tray and the rear end face of the motor shaft is coated with adhesive.

[0009] Preferably, the contact surface between the grating tray and the screw head is coated with adhesive.

[0010] Preferably, the grating tray is made of 6-series aluminum alloy, and the grating disk is made of stainless steel.

[0011] Preferably, the side of the grating tray facing the motor shaft is also provided with a bushing feature, and the bushing feature is interference-fitted with the motor shaft.

[0012] Preferably, two screws are used.

[0013] Based on the same inventive concept, this application also discloses a galvanometer motor, including a motor rear cover, a motor housing, a motor shaft, and a lens. The motor rear cover directly or indirectly covers the rear opening of the cylindrical motor housing. The motor shaft is coaxially mounted at the center of the motor housing with the axis of the cylindrical body. The lens is indirectly fixed to the front end of the motor shaft and mounted on the front of the motor housing. The rear part of the galvanometer motor uses the aforementioned laser scanning digital galvanometer motor feedback structure.

[0014] Preferably, it also includes a deep groove ball bearing, a bearing pressure plate, and a gasket. The deep groove ball bearing is mounted on the rear of the motor shaft. The bearing pressure plate is located in front of the grating tray and is fixed to a step on the motor housing perpendicular to the motor shaft by screws. The annular gasket is installed between the bearing pressure plate and the end face of the deep groove ball bearing.

[0015] Compared to existing technologies, this solution offers the following advantages: The laser scanning digital galvanometer motor feedback structure of this application utilizes a grating disk scheme. The grating ruler on the grating disk provides micron- or even nanometer-level position feedback, ensuring high-precision positioning. Real-time feedback and adjustment reduce errors and improve motion control accuracy. The closed-loop control method of this solution reduces the impact of external interference, resulting in more stable operation. Furthermore, the non-contact measurement of the grating ruler reduces mechanical wear and extends its service life. Precise control reduces energy waste and improves efficiency. The efficient design of the grating scheme also reduces heat generation during operation, minimizing cooling requirements. Simultaneously, the grating digital motor integrates the grating feedback system with the motor, reducing the need for external sensors and simplifying system design. Grating systems are typically compact, easy to install, and simple to debug, reducing usage and maintenance costs. By changing the mounting method of the grating tray and motor shaft to multiple screws and glue for fastening, reliability is increased; at the same time, high dynamic performance is ensured, enabling rapid acceleration, deceleration and reversal, and the grating disk can still maintain high-speed operation under high precision requirements; by changing the grating tray to a lightweight material, processing is facilitated and costs are saved; ultimately, by reducing the number of parts and installation steps, processing costs are reduced, production efficiency is improved and stability is enhanced. Attached Figure Description

[0016] Figure 1 This is an axial cross-sectional schematic diagram of an embodiment of the laser scanning digital galvanometer motor feedback structure of this scheme;

[0017] Figure 2 This is a three-dimensional schematic diagram of the side and rear side of the grating disk of the laser scanning digital galvanometer motor feedback structure in this scheme;

[0018] Figure 3 This is a three-dimensional structural diagram of an embodiment of the galvanometer motor of this solution;

[0019] Among them, 1-motor shaft, 2-motor housing, 3-motor rear cover, 4-photoelectric plate, 41-reading head, 5-grating disk, 6-grating tray, 61-shaft sleeve feature, 7-motor base sleeve, 8-screw, 9-lens, 10-deep groove ball bearing, 11-bearing pressure plate, 12a-wave spring washer, 12b-flat washer. Detailed Implementation

[0020] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0021] This application provides an embodiment of a laser scanning digital galvanometer motor feedback structure: This embodiment includes a motor rear cover 3, a motor housing 2, a motor shaft 1, a photoelectric plate 4, a grating disk 5, and screws 8. The motor rear cover 3 is fitted onto the rear opening of the cylindrical motor housing 2 via a motor base sleeve 7. In this embodiment, the screws 8 are directly driven into the motor housing 2. Depending on the design of different motor housings 2 or motor rear covers 3, they can also be directly fixed to the motor housing 2. The rear part of the motor shaft 1 is installed parallel to the axis of the cylindrical body on the rear side of the motor housing 2. The photoelectric plate 4 is installed perpendicular to the axis of the cylindrical body. The grating disk 5 is mounted between the motor shaft 1 and the motor rear cover 3, with a gap between it and the motor shaft 1. It is installed on the motor shaft 1 using two screws 8 via a grating tray 6 and rotates coaxially with the motor shaft 1. The grating disk 5 is coaxial with the grating tray 6 and mounted on the side of the grating tray 6 facing the photoelectric plate 4. The reading head 41 is welded to the photoelectric plate 4 along the track facing the grating disk 5, also with a gap between it and the motor shaft 1, achieving a non-contact measurement effect. The two screws 8 symmetrically and evenly fix the grating disk 5 to the rear end face of the motor shaft 1 with the grating disk 5's axis as the center. Under certain conditions, the grating disk 5 can also be directly fixed to the rear end face of the motor shaft 1. Using the grating tray 6 allows for greater versatility for different motors. Both screws 8 have threads coated with adhesive. The contact surfaces between the grating tray 6 and the rear end face of the motor shaft 1 are also coated with adhesive. The fixing method between the grating tray 6 and the motor shaft 1 can also be changed to three screws 8 or more screws plus adhesive; two screws are the most economical method. The fixing screws 8 between the grating tray 6 and the motor shaft 1 can also be replaced with other screws, such as hex socket head cap screws, countersunk screws, etc., and the screw head shape is not limited.

[0022] In this embodiment, the grating tray 6 is made of 6-series aluminum alloy with grade 6061. This material is lighter, easier to machine, and has a stable structure. The grating disk 5 is made of SUS304 stainless steel. The reflective and absorptive surfaces of the grating disk 5 made of this material are relatively easy to achieve the required reflectivity, and the two are directly bonded and fixed.

[0023] To improve ease of installation, the grating tray 6 is provided with a bushing feature 61 on the side facing the motor shaft 1, and the bushing feature 61 is interference-fitted with the motor shaft 1. A keyway can also be machined at the mating point between the bushing feature 61 of the grating tray 6 and the motor shaft 1, which can also reduce the possibility of the screw 8 loosening.

[0024] By fixing the grating tray with multiple screws in the middle of the top instead of fixing it on one side, installation is more convenient, the force is more even, and the performance is more stable, thus enhancing stability.

[0025] In this embodiment, after the motor body is installed, the grating disk 5 and grating tray 6 are mounted onto the motor shaft 1 and tightened with two screws 8. The photoelectric plate 4 is then mounted onto the motor housing 2. The reading head 41 on the photoelectric plate 4 can read the position of the rectangular hole on the grating disk 5, thereby determining the motor position. The photoelectric plate is secured with screws and positioning pins, and the positioning point is adjustable to ensure installation accuracy and performance stability. Then, the motor base sleeve 7 and the motor rear cover 3 are installed, and the motor rear cover 3 is tightened with two more screws 8.

[0026] Based on the same inventive concept, this application also discloses a galvanometer motor, including a motor rear cover 3, a motor housing 2, a motor shaft 1, a lens 9, a deep groove ball bearing 10, and a bearing pressure plate 11. The motor rear cover 3 directly or indirectly covers the rear opening of the cylindrical motor housing 2. The motor shaft 1 is coaxially mounted at the center of the motor housing 2 with the axis of the cylindrical body. The lens 9 is indirectly fixed to the front end of the motor shaft and mounted in front of the motor housing 2. The rear part of the galvanometer motor uses the aforementioned laser scanning digital galvanometer motor feedback structure. The deep groove ball bearing 10 is fitted on the rear part of the motor shaft 1. The bearing pressure plate 11 is located in front of the grating tray 6 and is fixed to the step on the motor housing 2 perpendicular to the motor shaft 1 by screws.

[0027] In order to control the axial position of the motor and better adjust the vertical movement of the motor shaft 1, this embodiment also adds an adjustable force scheme. The galvanometer motor also includes an annular shim, which is installed between the bearing pressure plate 11 and the end face of the deep groove ball bearing 10. In this embodiment, it includes a wave spring shim 12a and a flat shim 12b. The flat shim 12b is closer to the deep groove ball bearing 10, and the wave spring shim 12a is closer to the bearing pressure plate 11.

[0028] The above description is only a preferred embodiment of the present solution, but the scope of protection claimed by the present solution is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and inventive concept of this application, should be included within the scope of protection of this application.

Claims

1. A laser scanning digital galvanometer motor feedback structure, comprising a motor rear cover (3), a motor shell (2), a motor shaft (1), and a photoelectric plate (4), the motor rear cover (3) directly or indirectly covers the rear opening of the cylindrical motor shell (2), the motor shaft (1) is installed on the rear side of the motor shell (2) in parallel with the axis of the barrel, and the photoelectric plate (4) is installed between the motor shaft (1) and the motor rear cover (3) in perpendicular to the axis of the barrel and leaves a gap with the motor shaft (1), characterized in that: It also includes a grating disc (5) which is directly or indirectly mounted on the motor shaft (1) using screws (8) and rotates coaxially with the motor shaft (1), a reading head (41) which is welded to the photoelectric plate (4) and also keeps a gap with the motor shaft (1) and faces the track of the grating disc (5), and the screws (8) which are more than two and symmetrically and uniformly fix the grating disc (5) directly or indirectly on the rear end surface of the motor shaft (1) with the center of the grating disc (5) as the center.

2. The laser scanning digital galvanometer motor feedback structure according to claim 1, characterized in that: It also includes a grating tray (6) which fixes the grating disc (5) on the rear end surface of the motor shaft (1), and the grating disc (5) is coaxial with the grating tray (6) and is mounted on the side of the grating tray (6) facing the photoelectric plate (4).

3. The laser scanning digital galvanometer motor feedback structure according to claim 1, characterized in that: The screws (8) are threadedly coated with anti-glue.

4. The laser scanning digital galvanometer motor feedback structure of claim 2, wherein: The contact surface of the grating tray (6) with the rear end surface of the motor shaft (1) is coated with glue.

5. The laser scanning digital galvanometer motor feedback structure according to claim 2, characterized in that: The contact surface of the grating tray (6) with the screw head of the screw (8) is coated with glue.

6. The laser scanning digital galvanometer motor feedback structure according to claim 2, characterized in that: The material of the grating tray (6) is 6 series aluminum alloy, and the material of the grating disc (5) is stainless steel.

7. The laser scanning digital galvanometer motor feedback structure according to claim 1, characterized in that: The side of the grating tray (6) facing the motor shaft (1) is also provided with a shaft sleeve feature (61), and the shaft sleeve feature (61) is interference-fitted with the motor shaft (1).

8. The laser scanning digital galvanometer motor feedback structure according to claim 1, characterized in that: The number of screws (8) is two.

9. A galvanometer motor comprising a motor back cover (3), a motor shell (2), a motor shaft (1), a mirror (9), the motor back cover (3) directly or indirectly covers the back opening of the cylindrical motor shell (2), the motor shaft (1) is coaxially installed with the cylinder axis in the center of the motor shell (2), and the mirror (9) is indirectly fixed with the front end of the motor shaft and installed on the front face of the motor shell (2), characterized in that: The rear part of the galvanometer motor uses the laser scanning digital galvanometer motor feedback structure as claimed in any one of claims 1 to 8.

10. The galvanometer motor according to claim 9, characterized by: It also includes a deep groove ball bearing (10), a bearing pressing plate (11) and a gasket, the deep groove ball bearing (10) is sleeved on the rear part of the motor shaft (1), the bearing pressing plate (11) is located in front of the grating tray (6) and is fixed on the step perpendicular to the motor shaft (1) on the motor shell (2) by screws, and the annular gasket is installed between the bearing pressing plate (11) and the end surface of the deep groove ball bearing (10).

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