CN212793934U

CN212793934U - Compact high-precision linear motion positioning workbench

Info

Publication number: CN212793934U
Application number: CN202021204211.4U
Authority: CN
Inventors: 印欣; 姚艺华; 林浩元; 吴彩鸣
Original assignee: Jacobs Precision Electromechanical Nantong Co ltd
Current assignee: Jacobs Precision Electromechanical Nantong Co ltd
Priority date: 2020-06-28
Filing date: 2020-06-28
Publication date: 2021-03-26
Anticipated expiration: 2030-06-28

Abstract

The utility model discloses a compact high accuracy linear motion positioning workbench, include: the device comprises a base, a movable object stage, a linear guide piece, a stator coil, a rotor magnet set and a sensor assembly; the utility model adopts the iron core linear motor to give the driving force to the workbench; compared with the driving of a coreless linear motor, the thrust density is greatly improved, and the thinning and miniaturization of the linear motion positioning platform are facilitated; the movement form of the magnet is also adopted, and a power line of the coil and a signal line of the sensor are fixed, so that the movement resistance and the wire abrasion are reduced, and the reliability of the positioning platform is improved; the stator core is made of high-permeability materials, is produced in a modularized mode, is freely spliced along the moving direction, can meet different stroke requirements, and is suitable for long-stroke application occasions.

Description

Compact high-precision linear motion positioning workbench

Technical Field

The utility model relates to a linear motion positioning table, concretely relates to compact high accuracy linear motion positioning table.

Background

The existing linear motion positioning platform adopts two structures.

One is a solution where the moving mechanism uses a rotary stepping motor and a ball screw, such as a linear motion sliding table product of a jun and a finisher. This scheme requires an externally-attached rotary stepping motor, and therefore, the thinning and compactness of the entire slide table are limited.

The second is to use a coreless linear motor to give a direct driving force to the positioning platform, such as a linear motor and a linear moving stage device with the patent number CN1747293A, compared with the first scheme of rotating a stepping motor and a ball screw, the direct driving scheme has advantages in transmission efficiency, speed and precision.

In the linear motor and linear moving stage apparatus with the patent grant No. CN1747293A, as shown in fig. 1 and fig. 2, the three-phase coil of the coreless linear motor is fixed to the stage by a coil fixing mold in a heat-sealing manner; the objective table is made of non-magnetic materials, so that the attraction among the objective table, the permanent magnet and the base is completely eliminated; meanwhile, the magnetic resistance of the magnetic circuit of the motor is large, so that the output thrust of the motor is reduced; in order to improve the output thrust of the motor, one method is to increase the thicknesses of the coil and the permanent magnet, which increases the height of the platform, thereby limiting the thinning and compactness of the linear motion positioning platform; another approach is to increase the length of the coil and permanent magnet in the B direction, which also limits the compactness of the linear motion platform. Both of the above methods inevitably increase the moving mass and reduce the responsiveness of the system.

In addition, the existing linear motion platform mostly adopts a coil motion mode, and a permanent magnet on the stator side is fixed on a base along the length direction A; the whole movable stroke bears the load of the objective table, the power line of the coil can be driven to move together, the movement resistance is increased, the abrasion of the electric wire is easy to cause, and the reliability of the positioning platform is reduced.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: the utility model aims to solve the defects in the prior art, and provides a compact high-precision linear motion positioning workbench using an ultrathin linear motor, which is different from the traditional technology in that an iron core linear motor is adopted to give direct driving force to the workbench; in addition, the workbench adopts a magnet movement mode, and the magnet is directly and fixedly arranged on the objective table; compared with the scheme of rotating the stepping motor and the ball screw, the direct drive scheme is adopted, and the transmission efficiency, the speed and the precision are all superior. Compared with the driving of a coreless linear motor, the driving of the coreless linear motor is adopted, the output thrust density is higher, and the thinning and miniaturization of the linear motion positioning platform are more favorably realized; this application adopts the form that adopts magnet motion, compares in the coil motion, has reduced the resistance and the electric wire wearing and tearing of motion, has promoted positioning platform's reliability, more is fit for the application occasion of long stroke.

The technical scheme is as follows: a compact high accuracy linear motion positioning table, include: the device comprises a base, a movable object stage, a linear guide piece, a stator coil, a rotor magnet set and a sensor assembly; the sensor component comprises a position detection sensor and a grating ruler, the position detection sensor is arranged in the sensor mounting groove, the mobile objective table is arranged on the base through two groups of linear guide pieces which are parallel to each other, and the grating ruler is arranged right above the detection sensor; the two groups of linear guide pieces which are parallel to each other are arranged on two sides of the stator mounting groove, a rotor magnet group is arranged on the movable object stage right above the stator coil, and the rotor magnet group consists of a plurality of permanent magnets; the stator coil includes: the motor comprises an enameled wire coil, a stator core and a core framework; the stator core is formed by splicing a plurality of iron core modules, a plurality of coil mounting grooves are formed in each iron core module, the enameled wire coil is mounted in the coil mounting grooves in the iron core modules, and the enameled wire coil is directly wrapped on the stator core with the enameled wire coil.

Further, the linear guide piece comprises a sliding block and a guide rail, the sliding block is slidably mounted on the guide rail, the guide rail is mounted on two sides of a stator mounting groove in the base, and the sliding block is mounted on the movable object stage.

Further, the grating ruler and the guide rail are parallel to each other.

Further, positioning table still is equipped with stop device, stop device comprises 1 locating piece and 2 stopper, and wherein 2 stoppers are installed in one side of base to connecting wire and sharp guide between 2 stoppers are parallel to each other, and the locating piece is installed on the removal objective table directly over the connecting wire between 2 stoppers, and the locating piece moves between 2 stoppers when making removal objective table slide on the base.

Furthermore, the movable object stage is made of magnetic conductivity materials and also serves as a magnet yoke.

Further, the stator core is made of a high-permeability magnetic material.

Further, the base is made of a non-magnetic light material.

Has the advantages that: the utility model relates to an application has compact high accuracy direct drive goniometer slip table of iron core motor to compare with the scheme of rotatory step motor + ball screw, adopts the direct drive scheme, all has advantages in transmission efficiency, speed and precision aspects.

The utility model adopts the iron core linear motor to give the driving force to the workbench; compared with the driving of a coreless linear motor, the thrust density is greatly improved, and the thinning and miniaturization of the linear motion positioning platform are facilitated;

the utility model also adopts the form of magnet movement, the power line of the coil and the signal line of the sensor are fixed, thus reducing the resistance of movement and the abrasion of electric wires and improving the reliability of the positioning platform; the stator core is made of high-permeability materials, is produced in a modularized mode, is freely spliced along the moving direction, can meet different stroke requirements, and is suitable for long-stroke application occasions.

Drawings

FIG. 1 is a schematic diagram of a linear motor and a linear stage apparatus according to the prior art;

FIG. 2 is a schematic cross-sectional view of FIG. 1;

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is a sectional view of the cross-section taken along the line A-A in FIG. 3;

fig. 5 is a schematic structural view of a stator coil;

FIG. 6 is a schematic sectional view taken along line B-B of FIG. 5;

1. positioning a workbench; 2. a base; 21. a limiting block; 22. a stator mounting groove; 3. a movable stage; 31. positioning blocks; 4. a linear guide; 41. a guide rail; 42. a slider; 5. a stator coil; 51. a power line; 52. enameled wire coils; 53. a stator core; 54. an iron core skeleton; 6. a mover magnet group; 7. a sensor assembly; 71. a signal line; 72. a position detection sensor; 73. a grating ruler.

Detailed Description

The technical scheme shown in figures 3-6 is as follows: a compact high precision linear motion positioning stage 1 comprising: the device comprises a base 2, a movable object stage 3, a linear guide 4, a stator coil 5, a rotor magnet group 6 and a sensor assembly 7; the base 2 is provided with two parallel grooves, namely a stator mounting groove 22 and a sensor mounting groove, the stator coil 5 is mounted in the stator mounting groove 22, the sensor component 7 is composed of a position detection sensor 72 and a grating ruler 73, the position detection sensor 72 is mounted in the sensor mounting groove, the mobile object stage 3 is mounted on the base 2 through two groups of linear guide pieces 4 which are parallel to each other, and the grating ruler 73 is mounted right above the detection sensor; the two groups of mutually parallel linear guide pieces 4 are arranged at two sides of the stator mounting groove 22, the moving object stage 3 right above the stator coil 5 is provided with a rotor magnet group 6, and the rotor magnet group 6 consists of a plurality of permanent magnets; the stator coil 5 includes: the enameled wire coil 52, the stator core 53 and the core frame 54; stator core 53 is formed by a plurality of iron core module concatenations, is equipped with a plurality of coil mounting grooves on every iron core module, enameled wire coil 52 installs in the coil mounting groove on the iron core module, enameled wire coil 52 directly wraps up on the stator core 53 that has enameled wire coil 52.

Further in this example, the linear guide 4 is composed of a slide block 42 and a guide rail 41, the slide block 42 is slidably mounted on the guide rail 41, the guide rail 41 is mounted on both sides of the stator mounting groove 22 in the base 2, and the slide block 42 is mounted on the movable object stage 3 so that the base 2 and the movable object can slide with each other.

Further in this example, positioning table 1 still is equipped with stop device, stop device comprises 1 locating

piece

31 and 2 stopper 21, wherein 2 stopper 21 install in one side of base 2 to connecting wire and sharp guide 4 between 2 stoppers 21 are parallel to each other, locating piece 31 is installed on the removal objective table 3 directly over the connecting wire between 2 stoppers 21, and locating piece 31 moves between 2 stoppers 21 when making removal objective table 3 slide on base 2, prevents through stop device that the objective table from following sharp guide 4 landing when moving along the direction of movement.

Further in this embodiment, the movable stage 3 is made of magnetic conductive material and also serves as a magnetic yoke.

Further in this embodiment, the stator core 53 is made of a high permeability material, which may be a silicon steel sheet or a soft magnetic composite material, so as to reduce eddy current loss generated during the movement.

Further in this example, the base 2 is made of non-magnetic lightweight material, such as aluminum, which reduces the mass of the entire workbench; non-magnetic high-rigidity materials such as stainless steel can be adopted, and the height of the whole platform can be further reduced by adopting high-rigidity stainless steel with a thinner thickness.

Through the magnetic field that runner magnet group 6 and circulating current's stator coil 5 produced, through moving objective table 3, stator core 53 and the air gap between them form the closed circuit, compared with the no iron core scheme of the utility model, the magnetic resistance greatly reduces; compared with the coreless linear motor with the same size, the output thrust of the coreless linear motor is greatly improved.

Through the modular design of the stator core 53, the stator core can be freely spliced along the moving direction of the moving object stage 3 so as to meet different stroke requirements.

The stator coil 5 and the sensor are fixedly arranged on the base 2, and then the power wire 51 of the stator coil 5 and the signal wire 71 of the sensor are fixed, so that the movement form of the magnet reduces the movement resistance and the wire abrasion, improves the reliability of the positioning platform, and is more suitable for long-stroke application occasions.

The application adopts an iron core linear motor to give driving force to the workbench; compared with the driving of a coreless linear motor, the thrust density is greatly improved, and the thinning and miniaturization of the linear motion positioning platform are facilitated; the total height of the linear positioning workbench 1 manufactured based on the application is only 14mm, and the thrust can be continuously output within 30mm of the effective stroke by 7.6N; and the continuous output thrust of the coreless motor linear positioning workbench 1 with the approximate size is only 4.6N.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.

Claims

1. The utility model provides a compact high accuracy linear motion positioning table which characterized in that: the method comprises the following steps: the device comprises a base, a movable object stage, a linear guide piece, a stator coil, a rotor magnet set and a sensor assembly; the sensor component comprises a position detection sensor and a grating ruler, the position detection sensor is arranged in the sensor mounting groove, the mobile objective table is arranged on the base through two groups of linear guide pieces which are parallel to each other, and the grating ruler is arranged right above the detection sensor; the two groups of linear guide pieces which are parallel to each other are arranged on two sides of the stator mounting groove, a rotor magnet group is arranged on the movable object stage right above the stator coil, and the rotor magnet group consists of a plurality of permanent magnets; the stator coil includes: the motor comprises an enameled wire coil, a stator core and a core framework; the stator core is formed by splicing a plurality of iron core modules, a plurality of coil mounting grooves are formed in each iron core module, the enameled wire coil is mounted in the coil mounting grooves in the iron core modules, and the enameled wire coil is directly wrapped on the stator core with the enameled wire coil.

2. The compact high precision linear motion positioning stage of claim 1, further comprising: the linear guide piece comprises a sliding block and a guide rail, the sliding block is slidably mounted on the guide rail, the guide rail is mounted on two sides of a stator mounting groove in the base, and the sliding block is mounted on the movable object stage.

3. The compact high precision linear motion positioning stage of claim 2, further comprising: the grating ruler and the guide rail are parallel to each other.

4. The compact high precision linear motion positioning stage of claim 1, further comprising: the positioning workbench is further provided with a limiting device, the limiting device is composed of 1 positioning block and 2 limiting blocks, wherein the 2 limiting blocks are installed on one side of the base, the connecting lines between the 2 limiting blocks are parallel to the linear guide piece, the positioning blocks are installed on the movable object stage directly above the connecting lines between the 2 limiting blocks, and the positioning blocks are moved between the 2 limiting blocks when the movable object stage slides on the base.

5. The compact high precision linear motion positioning stage of claim 1, further comprising: the movable objective table is made of magnetic conductivity materials and also serves as a magnet yoke.

6. The compact high precision linear motion positioning stage of claim 1, further comprising: the stator core is made of high-permeability magnetic materials.

7. The compact high precision linear motion positioning stage of claim 1, further comprising: the base is made of non-magnetic light materials.