Galvanometer motor

Abstract

The utility model relates to a galvanometer motor, which comprises a shell and a lens assembly arranged at one end of the shell, and is characterized in that the lens assembly comprises a bracket and a lens clamped on the bracket; a rotor assembly is arranged in the shell, and one end of the rotor assembly and the support are integrally arranged; a limiting gasket is fixedly arranged on the outer surface of the side, facing the lens assembly, of the shell, a first limiting part is arranged on the limiting gasket, a second limiting part is arranged on the support, and the shape and the position of the first limiting part are matched with those of the second limiting part. And the first limiting part reciprocates in the second limiting part in the swinging process of the lens assembly relative to the shell so as to prevent the lens from swinging excessively. According to the galvanometer motor, the rotor assembly and the lens assembly are integrally arranged, so that the weight is reduced, and the rotational inertia is reduced; the swing angle is limited through the limiting gasket, and the machining and mounting technology is simplified.

Description

Technical Field

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

[0002] LiDAR is an indispensable detection and sensing component for autonomous driving. LiDAR can be used for object detection and avoidance, object recognition and tracking, real-time positioning and map construction, etc. As the core component of LiDAR, the galvanometer motor plays an important role in LiDAR.

[0003] In the galvanometer motor in the prior art, the rotating shaft arranged in the shell is usually set separately from the lens assembly. During the assembly process, the rotating shaft is installed first, and then one end of the rotating shaft is fixedly connected to the lens assembly by screws or the like, resulting in heavy weight and large moment of inertia. Overall, the dynamic response of the galvanometer motor is poor. At the same time, a limit device for limiting the swing angle of the galvanometer motor needs to be specially set up, and the processing technology of the limit device is complicated and the installation of parts is relatively cumbersome. Utility Model Content

[0004] In view of the technical problems existing in the prior art, the present application proposes a galvanometer motor, which reduces weight and moment of inertia by integrating a rotor assembly with a lens assembly; and limits the swing angle by limiting a limit gasket, thereby simplifying the processing and installation process. The galvanometer motor comprises: a housing and a lens assembly arranged at one end of the housing, wherein the lens assembly comprises a bracket and a lens clamped on the bracket; a rotor assembly is arranged in the housing, wherein one end of the rotor assembly is integrated with the bracket; a limit gasket is fixedly arranged on the outer surface of the housing facing the lens assembly, a first limit portion is arranged on the limit gasket, and a second limit portion is arranged on the bracket, wherein the protrusion is arranged to match the shape and position of the second limit portion, and the protrusion reciprocates in the second limit portion during the swinging of the lens assembly relative to the housing to prevent the lens from swinging excessively.

[0005] Optionally, the bracket includes an upper end, a lower end and a connecting portion therebetween, and the three form a "["-shaped space for clamping the lens, wherein the upper end and the lower end are respectively clamped on the upper and lower sides of the lens, and the ends of the lens are abutted against the vertical inner wall of the "["-shaped space; the connecting portion is provided with a second circular opening on the side facing the rotor assembly, and extends along the axial direction of the rotor assembly to form an accommodating space, one end of the rotor assembly is accommodated in the accommodating space, and the rotor assembly and the bracket are integrally formed.

[0006] Optionally, a central through hole for the bracket to pass through is opened in the middle of the limiting gasket, the second limiting portion is a groove arranged on the outer surface of the connecting portion, and the first limiting portion is a protrusion extending toward the center direction along the circumference of the central through hole.

[0007] Optionally, the rotor assembly comprises a magnetic column for conducting magnetism, and an end of the magnetic column away from the lens assembly is sleeved with a non-magnetic sleeve.

[0008] Optionally, the limiting gasket is fixedly connected to the shell by any one of screwing, riveting, welding or bonding.

[0009] Optionally, the sleeve includes a first shaft segment and a second shaft segment connected in sequence, the second shaft segment is sandwiched between the first shaft segment and the magnetic column, and the diameters of the first shaft segment, the second shaft segment and the magnetic column gradually increase to form a step shape.

[0010] Optionally, a front end bearing end cover is further provided between one end of the shell and the limiting gasket, and the front end bearing end cover is provided with a central through hole along the axial direction for the bracket to pass through.

[0011] Optionally, the material of the magnetic column is a magnet, and the material of the shaft sleeve is steel.

[0012] Optionally, the diameter of the first shaft segment ranges from 1.5 mm to 2.5 mm.

[0013] Optionally, the diameter of the second shaft segment ranges from 3 mm to 5 mm.

[0014] Optionally, the diameter of the magnetic column ranges from 4.5 mm to 6.5 mm.

[0015] The galvanometer motor provided in the present application has one end of the rotor assembly integrally arranged with the lens assembly, which simplifies the parts assembled between the two, reduces production costs, reduces weight, and reduces the moment of inertia. Overall, the dynamic response of the galvanometer motor is greatly improved; the swing angle of the galvanometer motor is limited by a limit gasket, which simplifies the processing and installation process. 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 is a schematic diagram of the three-dimensional structure of a galvanometer motor according to an embodiment of the present application;

[0018] Figure 2 yes Figure 1 Sectional view along AA direction;

[0019] Figure 3is a schematic diagram of the three-dimensional structure of the lens assembly and the rotor assembly of an embodiment of the present application;

[0020] Figure 4 yes Figure 1 Schematic diagram of the structure in the middle M direction;

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

[0022] Figure 6 is a schematic diagram of the three-dimensional structure of a housing according to an embodiment of the present application;

[0023] Figure 7 It is an assembly diagram of the galvanometer motor according to an embodiment of the present application. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] Figure 1 is a schematic diagram of the three-dimensional structure of a galvanometer motor according to an embodiment of the present application, Figure 2 is a schematic diagram of the three-dimensional structure of the lens assembly and the rotor assembly of the embodiment of the present application, such as Figure 1 , Figure 2As shown, the galvanometer motor provided in the embodiment of the present application includes a housing 12 and a lens assembly 13 arranged at one end of the housing, the lens assembly 13 includes a bracket 28 and a lens 29 clamped on the bracket 28, and the end of the bracket 28 away from the lens 29 is integrated with one end of the rotor assembly 22. Integrating the rotor assembly and the bracket can effectively reduce the connection links, reduce the complexity of the system, improve the accuracy and reduce the potential errors caused by the connection. At the same time, the parts assembled between the rotor assembly and the bracket can be simplified, the production cost can be reduced, the weight can be reduced, the moment of inertia can be reduced, and the dynamic response of the galvanometer motor can be improved.

[0027] Figure 3 yes Figure 1 The structural diagram of the M direction is as follows: Figure 1 , Figure 3 As shown, a limiting gasket 273 is fixedly provided on the outer surface of the housing 12 facing the lens assembly 13, and the specific connection method can be screwing, riveting, welding or bonding. The limiting gasket 273 is provided with a first limiting portion 2731, and the bracket 28 is provided with a second limiting portion 2831. The shapes and positions of the first limiting portion 2731 and the second limiting portion 2831 are adapted to each other. Figure 3 In the embodiment shown, a central through hole is provided in the middle of the limiting gasket for the bracket to pass through, the second limiting portion is a groove provided on the outer surface of the connecting portion, and the first limiting portion is a convex block extending toward the center along the circumference of the central through hole. The convex block reciprocates in the groove during the swinging process of the lens assembly relative to the housing to prevent the lens from swinging excessively. Providing the limiting assembly in the form of a limiting gasket can simplify the processing technology and assembly process and reduce production costs.

[0028] In some embodiments, Figure 2 As shown, the bracket 28 includes an upper end 281, a lower end 282 and a connecting portion 283 therebetween, which form a "["-shaped space for clamping the lens 29, wherein the upper end 281 and the lower end 282 are clamped on the upper and lower sides of the lens 29 respectively, and the ends of the lens 29 abut against the vertical inner wall of the "["-shaped space. At this time, the connecting portion 283 is integrally formed with the rotor assembly 22.

[0029] In some embodiments, Figure 2As shown, the connecting portion 283 is provided with a second circular opening 2832 on one side facing the rotor assembly 22, and extends along the axial direction of the rotor assembly 22 to form an accommodation space, one end of the rotor assembly 22 is accommodated in the accommodation space, and the rotor assembly 22 can be fixed in the accommodation space by bonding or welding to ensure the connection strength and stability between the two. In other embodiments, the rotor assembly and the bracket can be directly designed and manufactured in an integrated manner by precision casting, computer digital controlled precision machining (CNC machining) or 3D printing, etc., on the basis of accurately simulating and calculating the magnetic field distribution of the magnetic column and the overall structural strength, and ensuring that the requirements of motor drive and lens stability are met.

[0030] In some embodiments, Figure 2 As shown, the rotor assembly 22 includes a magnetic column 221 for conducting magnetism, and a non-magnetic sleeve 222 is sleeved on one end of the magnetic column 221 away from the lens assembly 13. The magnetic column 221 and the connecting portion 283 are integrally formed, and the material of the magnetic column 221 can be a rare earth permanent magnetic material or a special alloy that can conduct magnetism, preferably a rare earth permanent magnetic material; the material of the sleeve 222 can be steel. Through the integrated design of the magnetic column and the rotor assembly connection, the sleeve at the end of the magnetic column facing the lens assembly, as well as the matching screws and other connecting parts are omitted, which simplifies the structure, reduces costs, makes assembly more convenient and quick, and improves the dynamic response of the galvanometer motor.

[0031] Furthermore, the shaft sleeve 222 includes a first shaft segment 2221 and a second shaft segment 2222 connected in sequence, the second shaft segment 2222 is sandwiched between the first shaft segment 2221 and the magnetic column 221, and the diameters of the first shaft segment 2221, the second shaft segment 2222, and the magnetic column 221 gradually increase to form a step shape. The diameter range of the first shaft segment 2221 is 1.5mm-2.5mm, preferably 2mm; the diameter range of the second shaft segment 2222 is 3mm-5mm, preferably 4mm; the diameter range of the magnetic column 221 is 4.5mm-6.5mm, preferably 5.5mm.

[0032] In some embodiments, Figure 1 , Figure 3As shown, the first limiting portion 2731 is set as a protruding portion, and the second limiting portion 2831 is correspondingly set as a slotted portion, and the protruding portion is exactly placed at the center of the slotted portion. At the same time, the width of the slotted portion is greater than the width of the protruding portion, and the two side edges of the slotted portion are not straight edge structures, but have a certain slope to form an angle of about 30°-60°. Such a structural setting can make the first limiting portion 2731 reciprocate in the second limiting portion 2831 during the swinging process of the lens assembly 13 relative to the shell 12, and the two side edges of the first limiting portion 2731 move within the width range of the second limiting portion 2831 to prevent the lens 29 from swinging excessively. The number of the first limiting portion 2731 can be one or more, and the number of the second limiting portion 2831 corresponds to one or more.

[0033] Furthermore, the first limiting portion 2731 is a convex block, and its shape can be square, semicircular, semi-elliptical, etc.; the second limiting portion 2831 is a groove, and its shape can be fan-shaped, semicircular, semi-elliptical, etc. Of course, the first limiting portion 2731 and the second limiting portion 2831 can also be opposite, that is, the first limiting portion 2731 is a groove, and the second limiting portion 2831 is a convex block.

[0034] In some embodiments, Figure 2 , Figure 3 As shown, a central through hole 2732 for the bracket 28 to pass through is opened in the middle of the limiting gasket 273, and the first limiting portion 2731 is protruded toward the center of the central through hole along the circumferential edge thereof; the second limiting portion 2831 is accommodated in the central through hole, and the second limiting portion 2831 can be arranged in the middle section of the connecting portion 283 or near the junction of the connecting portion 283 and the upper end portion 281 or the lower end portion 282.

[0035] Figure 4 yes Figure 1 The cross-sectional view along the AA axis is as follows: Figure 1 , Figure 4As shown, a stator assembly 21 is provided in the housing 12, and the stator assembly 21 includes a stator 211 and a coil winding 212, and the coil winding 212 is arranged in the stator 211. By arranging the stator in the housing, a more closed magnetic field environment can be provided, so that the coil winding arranged in the stator can generate a magnetic field with higher magnetic efficiency, thereby improving the dynamic response of the galvanometer motor; one end of the rotor assembly is integrally arranged with the lens assembly, which can simplify the parts assembled between the two, reduce production costs, and reduce weight, reduce the moment of inertia, thereby improving the dynamic response of the galvanometer motor. The other end of the housing 12 is connected to the angle sensor assembly 11, and the angle sensor assembly 11 includes a flexible printed circuit board 31 (Flexible Printed Circuit Board, FPCB), one end of the flexible printed circuit board 31 is covered with a mask 32, and the other end is connected to the housing 12, and the mask 32 is connected to a back cover 33 on the side away from the flexible printed circuit board 31.

[0036] Figure 5 is a schematic diagram of the three-dimensional structure of the housing and the stator assembly according to an embodiment of the present application, Figure 6 is a schematic diagram of a three-dimensional structure of a housing according to an embodiment of the present application, such as Figure 5 , Figure 6 As shown, in some embodiments, the inner wall of the housing 12 is matched with the outer wall of the stator assembly 21 in shape and position and the two are fixedly connected; the end of the rotor assembly 22 away from the lens assembly 13 is arranged inside the stator 211. The stator assembly 21 can be interference fit with the housing 12, and a bonding layer can be provided at the connection between the two, or the two can be fixedly connected together by welding.

[0037] like Figure 5As shown, in some embodiments, the stator 211 is a magnetically conductive cylinder, and both ends of the stator 211 are provided with a first circular opening 2111, and the first circular opening 2111 is connected and penetrates along the axial direction of the stator 211. The coil winding 212 is nested and bonded to the inner wall of the stator 211 through the first circular opening 2111. The inlet and outlet wires of the coil winding 212 are both arranged at the bottom end of the stator 211 and are led out through the first circular opening 2111. The coil winding 212 forms a cylindrical tube, and its outer diameter is less than the inner diameter of the stator 211, and its length is less than the axial length of the stator 211. The coil winding 212 can be made by tooling, such as by a winding hanging plate, a winding installation platform, a coil inter-turn insulation wrapping platform, etc., and then can be nested and bonded to the inner wall of the stator 211 using a packaging process. Compared with the technical solution of winding on the corresponding skeleton, the coil winding 212 made in this way can simplify the structure, reduce the magnetic air gap, and improve the dynamic response of the galvanometer motor. Further, the material of the stator 211 can be electrical pure iron, low carbon steel, magnetic stainless steel, or nickel alloy.

[0038] In some embodiments, Figure 4 , Figure 5 As shown, the housing is a three-section structure, including a first chamber 23, a second chamber 24 and a third chamber 25 connected in sequence, the first chamber 23 is connected to the angle sensor assembly through a rear bearing chamber assembly 26, the second chamber 24 is used to accommodate the stator assembly 21, and the third chamber 25 is connected to the lens assembly through a front bearing chamber assembly 27. The rear bearing chamber assembly 26 may include a rear bearing end cover 261, the rear bearing end cover 261 may be interference fit with the first chamber 23, and a bonding layer is provided at the connection, and a rear bearing 262 is provided in the rear bearing end cover 261; the front bearing chamber assembly 27 may include a front bearing end cover 271, the front bearing end cover 271 may be interference fit with the third chamber 25, and a bonding layer is provided at the connection, a front bearing 272 is provided in the front bearing end cover 271, and the front bearing end cover 271 is connected to the limiting gasket 273 on the side away from the third chamber 25. The end faces of the stator 211 in the stator assembly 21 can respectively abut against the end faces of the second chamber 24, or be spaced a certain distance from the end faces of the second chamber 24, or any one end face abuts against the corresponding end face of the second chamber 24, and the other end face is spaced a certain distance from the corresponding end face of the second chamber 24. The shell can be manufactured by mold and machining, which simplifies the process flow and reduces the production cost. The shell can be made of non-magnetic material, such as aluminum alloy or stainless steel.

[0039] Furthermore, the first chamber 23 is a circular groove opened at the bottom end of the shell toward the angle sensor assembly, the third chamber 25 is a circular groove opened at the top end of the shell toward the lens assembly, and the second chamber 24 is an axially penetrating circular through hole sandwiched between the first chamber 23 and the third chamber 25, wherein the diameter of the second chamber 24 is smaller than the diameter of the first chamber 23 and the third chamber 25, forming a stepped inner cavity with a smaller inner diameter from the two ends of the shell toward the middle. The diameter range of the first chamber 23 and / or the third chamber 25 can be 14mm-16mm, preferably 15mm, and the depth range can be 2mm-4mm, preferably 3mm; the diameter range of the second chamber 24 can be 12mm-14mm, preferably 13mm, and the length range can be 20mm-24mm, preferably 22mm; the outer diameter range of the stator 211 can be 12mm-14mm, preferably 13mm, the inner diameter range can be 8mm-10mm, preferably 9mm, and the length range can be 20mm-24mm, preferably 22mm.

[0040] Figure 7 This is an assembly diagram of the galvanometer motor of the embodiment of the present application. Figure 7 The assembly process of the galvanometer motor of the embodiment of the present application is described. The stator assembly is encapsulated in the shell 12, one end of which is connected to the rear end bearing chamber assembly 26 and the angle sensor assembly 11 in sequence, and the other end is connected to the front end bearing assembly 27. The integrally arranged rotor assembly 22 and the bracket 28 pass through the central through hole provided on the front end bearing assembly 27, and are rotatably connected to the shell 12 through the rear end bearing and the front end bearing. A lens 29 is clamped on the bracket 28 to complete the complete assembly of the galvanometer motor.

[0041] The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Ordinary technicians in the relevant technical field can make various changes and modifications without departing from the scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention.

Claims

1. A galvanometer motor, comprising a housing and a lens assembly disposed at one end of the housing, characterized in that: The lens assembly comprises a bracket and a lens clamped on the bracket; a rotor assembly is arranged in the housing, and one end of the rotor assembly is integrated with the bracket; A limiting gasket is fixedly provided on the outer surface of one side of the shell facing the lens assembly, a first limiting portion is provided on the limiting gasket, and a second limiting portion is provided on the bracket. The shapes and positions of the first limiting portion and the second limiting portion are matched with each other. The first limiting portion reciprocates in the second limiting portion during the swinging of the lens assembly relative to the shell to prevent the lens from swinging excessively.

2. The galvanometer motor according to claim 1, characterized in that: The bracket includes an upper end, a lower end and a connecting portion therebetween, the three forming a "["-shaped space for clamping the lens, wherein: The upper end portion and the lower end portion are clamped on the upper and lower sides of the lens respectively, and the ends of the lens are against the vertical inner wall of the "["-shaped space; A second circular opening is provided on one side of the connecting portion facing the rotor assembly and extends along the axial direction of the rotor assembly to form an accommodating space. One end of the rotor assembly is accommodated in the accommodating space, and the rotor assembly and the bracket are integrally formed.

3. The galvanometer motor according to claim 2, characterized in that: A central through hole for the bracket to pass through is opened in the middle of the limiting gasket, the second limiting portion is a groove arranged on the outer surface of the connecting portion, and the first limiting portion is a protrusion extending toward the center along the circumference of the central through hole.

4. The galvanometer motor according to claim 1, characterized in that: The rotor assembly comprises a magnetic column for conducting magnetism, and a non-magnetic shaft sleeve is sleeved on one end of the magnetic column away from the lens assembly.

5. The galvanometer motor according to claim 1, characterized in that: The limiting gasket is fixedly connected to the shell by any one of screwing, riveting, welding or bonding.

6. The galvanometer motor according to claim 4, characterized in that: The shaft sleeve includes a first shaft segment and a second shaft segment connected in sequence, the second shaft segment is sandwiched between the first shaft segment and the magnetic column, and the diameters of the first shaft segment, the second shaft segment and the magnetic column gradually increase to form a step shape.

7. The galvanometer motor according to claim 1, characterized in that: A front end bearing end cover is also provided between one end of the housing and the limiting gasket. The front end bearing end cover is provided with a central through hole along the axial direction for the bracket to pass through.

8. The galvanometer motor according to claim 4, characterized in that: The material of the magnetic column is magnet, and the material of the shaft sleeve is steel.

9. The galvanometer motor according to claim 6, characterized in that: The diameter of the first shaft segment ranges from 1.5 mm to 2.5 mm.

10. The galvanometer motor according to claim 6, characterized in that: The diameter of the second shaft section ranges from 3 mm to 5 mm.

11. The galvanometer motor according to claim 6, characterized in that: The diameter of the magnetic column ranges from 4.5 mm to 6.5 mm.

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