CN103062311B - Eddy current damping vibration isolator of double-layer air-flotation orthogonal decoupling and air-flotation ball bearing angle decoupling - Google Patents
Eddy current damping vibration isolator of double-layer air-flotation orthogonal decoupling and air-flotation ball bearing angle decoupling Download PDFInfo
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Abstract
An eddy current damping vibration isolator of double-layer air-flotation orthogonal decoupling and air-flotation ball bearing angle decoupling belongs to the technical field of precise vibration isolation. An air-flotation face is used for lubricating and supporting between a sleeve of a vibration isolator main body and an air-flotation plate. An eddy current damper is used for attenuating vibration energy and improving stability. An air-flotation face is respectively used for lubricating and supporting between the air-flotation plate and a lower installing plate, between the air-flotation plate and a piston cylinder and between the air-flotation plate and the sleeve. A horizontal linear motion freedom degree between an upper installing plate and the lower installing plate is decoupled through a double-layer orthogonal air-flotation guide track, and an angle motion freedom degree is decoupled through an air-flotation ball bearing. A voice coil motor, a displacement sensor, a limit switch, a controller and a driver form a position closed loop feedback control system so as to conduct precise control for relative positions of the upper installing plate and the lower installing plate. The eddy current damping vibration isolator has the advantage of being free of rigidity in three dimensions, high in location precision and capable of fully decoupling the linear motion freedom degree and the angle motion freedom degree and can effectively achieve high-performance vibration isolation in ultra precise measurement instruments and machining devices, especially stepping scanning photoetching machines.
Description
Technical field
The invention belongs to accurate vibration isolation technical field, relate generally to the eddy-current damping vibration isolator of a kind of double-layer air flotation crossing decoupling and the decoupling zero of air-floating ball bearing angle.
Background technique
Along with improving constantly of Ultra-precision Turning and measuring accuracy, ambient vibration becomes the key factor that restriction Ultra-precision Turning equipment improves with surveying instrument precision and performance.Especially step-by-step scanning photo-etching device is the vlsi circuit process unit of representative, technology-intensive degree and complexity high, key technical index all reaches the limit of prior art, represent the highest level of Ultra-precision Turning equipment, precision isolation system becomes the core key technology in this type of equipment; The live width of step-by-step scanning photo-etching device has reached 22nm and following, silicon chip positioning precision and alignment precision all reach a few nanometer, and work stage movement velocity reaches more than 1m/s, work stage acceleration reaches tens times of gravity accleration, and this proposes new challenge to existing vibration isolation technique.First, lithography machine needs for metering system and photoetched object lens provide the working environment of " super quiet ", need again to drive simultaneously work stage at full speed with High acceleration motion, this proposes extremely harsh requirement to the anti-vibration performance of vibrating isolation system, and the natural frequency in its three directions all needs to reach below 1Hz; Secondly, relative position between each parts of lithography machine, the distance of such as photoetched object lens and silicon chip surface, all there is very strict requirement, and under the control being in position closed loop feedback control system, require that the relative positional accuracy between the upper and lower mounting plate of vibration isolator reaches 10 μm of magnitudes, the positioning precision of traditional vibration isolator can not meet the demands far away.
According to theory of vibration isolation, the natural frequency of passive type vibration isolator is directly proportional to rigidity, be inversely proportional to load quality, therefore, under the prerequisite that load quality is certain, the rigidity reducing vibration isolator is the effective way reducing natural frequency, improve low frequency and superlow frequency vibration isolating performance.There are the intrinsic contradictions of static bearing capacity and rigidity in the vibration isolator of the forms such as conventional air bellows, restrict by the factor such as material behavior, structural rigidity simultaneously, will reduce its rigidity, especially level further very difficult to rigidity.For this problem, " pendulum " formula structure is incorporated in air cushion shock absorber by researcher, reaches object (the 1.Nikon Corporation.Vibration Isolator With Low Lateral Stiffness. U.S. Patent Publication No.: US20040065517A1 reducing vibration isolator horizontal rigidity; 2.U.S.Philips Corporation.Positioning Device with a Force Actuator Systemfor Compensating Center-of-gravity Displacements, and Lithographic Device Provided with Such APositioning Device. U.S. Patent number: US005844664A).The method can reduce the horizontal rigidity of air cushion shock absorber to a certain extent, promotes its low frequency vibration isolation performance.The method Problems existing is: 1) restrict by material behavior and structural rigidity, the vertical limited extent reduced to rigidity with level of vibration isolator; 2) the vertical and level of air cushion shock absorber is all very poor to positioning precision, cannot meet the requirement of photoetching process; 3) lower horizontal rigidity to be reached and need larger pendulum length, cause vibration isolator height excessive, easily string membrane resonance occurs, poor stability.
By visible to the analysis of existing air cushion shock absorber technological scheme, existing air cushion shock absorber is difficult to meet the requirement of lithography machine to ultralow rigidity and high position precision.IDE company of Germany proposes a kind of vibration isolator technological scheme (1.Integrated Dynamics Engineering GmbH.Isolatorgeometrie EinesSchwingungsisolationssystem. european patent number: EP1803965A2 of abandoning tradition rubber air spring; 2.Integrated Dynamics EngineeringGmbH.Schwingungsisolationssystem Mit Pneumatischem Tiefpassfilter. european patent number: EP 1803970A2; 3.Integrated Dynamics Engineering GmbH.Air Bearing with Consideration ofHigh-Frequency Resonances. U.S. Patent Publication No.: US20080193061A1).Program employing is vertical carries out decoupling zero and vibration isolation to air bearing surface to the vibration of all directions with level, can reach extremely low rigidity and natural frequency.Program Problems existing is: 1) in public technology scheme, vibration isolator cannot realize accurate location; 2), in patent EP1803965A2, there is not the angular motion degrees of freedom around horizontal rotational shaft between upper and lower mounting plate, the angular rigidity in this direction and natural frequency are all very high; Patent EP1803970A2 and US20080193061A1 adopts block rubber to provide angular motion degrees of freedom around horizontal rotational shaft for upper and lower mounting plate, but because block rubber angular rigidity is very large, effectively cannot carry out angular motion freedom decoupling, there is frictional force between angular motion freedom decoupling mechanism part and introduce additional stiffness, restriction anti-vibration performance.
ASML company of Holland it is also proposed similar vibration isolator technological scheme (1.U.S.Philips Corp, ASM LithographyB.V.Pneumatic Support Device with A Controlled Gas Supply, and Lithographic Device Providedwith Such A Support Device. U.S. Patent number: US006144442A; 2.Koninklijke Philips ElectronicsN.V., ASM Lithography B.V.Lithographic Pneumatic Support Device with Controlled Gas Supply. International Patent Publication No.: WO99/22272; 3.ASML Netherlands B.V.Support Device, LithographicApparatus, and Device Manufacturing Method Employing A Supporting Device, and A PositionControl System Arranged for Use in A Supporting Device. U.S. Patent number: US007084956B2; 4.ASML Netherlands B.V.Support Device, Lithographic Apparatus, and Device ManufacturingMethod Employing A Supporting Device and A Position Control System Arranged for Use in ASupporting Device. european patent number: EP1486825A1).In patent US006144442A and WO99/22272, closed-loop feedback control is carried out to bleed pressure, reach and improve the stability of vibration isolator and the object of performance; On upper mounting plate, be provided with vibration transducer in patent US007084956B2 and EP1486825A1, introduce with reference to vibration system simultaneously, promoted the anti-vibration performance of vibration isolator by control algorithm.But propose technological scheme and still do not solve the accurate location of vibration isolator and the angular motion freedom decoupling problem of upper and lower mounting plate.
Summary of the invention
The object of the invention is for ultra precise measurement instrument and process unit, especially the vlsi circuit process unit such as step-by-step scanning photo-etching device is to the low natural frequency of vibration isolator, the an urgent demand of high position precision, the eddy-current damping vibration isolator of a kind of double-layer air flotation crossing decoupling and the decoupling zero of air-floating ball bearing angle is provided, vibration isolator all has approximate zero rigidity and extremely low natural frequency in three-dimensional, on, accurately location and 3 d-line freedom of movement can be carried out between lower installation board, angular motion freedom decoupling, thus effectively solve ultra precise measurement instrument and process unit, especially the accurate vibration isolation problem in step-by-step scanning photo-etching device.
Technical solution of the present invention is:
The eddy-current damping vibration isolator of a kind of double-layer air flotation crossing decoupling and the decoupling zero of air-floating ball bearing angle, by upper mounting plate, lower installation board, clean compressed gas source, tracheae and vibration isolator main body composition, vibration isolator main body is arranged between upper mounting plate and lower installation board, clean compressed gas source is communicated with vibration isolator main body by tracheae, in the structure of described vibration isolator main body, the lower surface of sleeve and air supporting plate are lubricated by axial carrying plane air bearing surface and support, piston cylinder back-off is arranged in sleeve, and lubricate with sleeve by the radial cylinder air bearing surface that carries and support, air-floating ball bearing is arranged between piston cylinder and upper mounting plate, X is rigidly connected to the lower surface of air-float guide rail and air supporting plate, sleeve and X are lubricated and guiding to air-float guide rail by X direction guiding rail air bearing surface, lower surface and the lower installation board of Y-direction air-float guide rail are rigidly connected, air supporting plate and lower installation board are lubricated by Z-direction bearing air-float face and support, air supporting plate and Y-direction air-float guide rail are lubricated and guiding by Y-direction guide rail air bearing surface, Z-direction voice coil motor, Z-direction displacement transducer, Z-direction limit switch, Z-direction eddy current damper are arranged between piston cylinder and sleeve, X is arranged on sleeve and air supporting plate between to limit switch, X to eddy current damper, Y-direction eddy current damper to displacement transducer, X to voice coil motor, X, and Y-direction voice coil motor, Y-direction displacement transducer, Y-direction limit switch are arranged between air supporting plate and lower installation board, the driving force direction of Z-direction voice coil motor is vertical direction, X is mutually vertical in horizontal plane to the driving force direction of voice coil motor and Y-direction voice coil motor, X, Y, Z-direction displacement transducer are consistent with the driving force direction of X, Y, Z-direction voice coil motor with the line of action direction of X, Y, Z-direction limit switch, and the damping force direction of X, Y, Z-direction eddy current damper is consistent with the driving force direction of X, Y, Z-direction voice coil motor respectively, X, Y, Z-direction displacement transducer are connected with the signal input part of controller respectively with X, Y, Z-direction limit switch, and the signal output part of controller is connected with the signal input part of driver, and the signal output part of driver is connected with X, Y, Z-direction voice coil motor respectively.
The X that described X is installed along X to voice coil motor driving force direction to eddy current damper by sleeve lower surface sidewall is formed to permanent magnet, the Y-direction permanent magnet that Y-direction eddy current damper is installed along Y-direction voice coil motor driving force direction by sleeve lower surface sidewall is formed, the Z-direction permanent magnet that Z-direction eddy current damper is installed along Z-direction voice coil motor driving force direction by sleeve inner cylindrical surface sidewall is formed, the pole orientation of X, Y, Z-direction permanent magnet is perpendicular to the surface of sleeve, and N, S pole is alternately arranged, sleeve adopts ferromagnetic material, and piston cylinder and air supporting plate adopt non-magnetic good conductor material.
Gas pressure sensor is provided with in described piston cylinder, piston cylinder is provided with suction port and solenoid valve, gas pressure sensor is connected with the signal input part of controller, and the signal output part of controller is connected with the signal input part of driver, and the signal output part of driver is connected with solenoid valve.
Described X, Y, Z-direction voice coil motor are cylinder type voice coil motor or plate voice coil motor.
Described X is single rail structure or two guide rail structure to air-float guide rail and Y-direction air-float guide rail.
Described X, Y, Z-direction displacement transducer are grating scale, magnetic railings ruler, appearance grid chi or linear potentiometer.
Described X, Y, Z-direction limit switch are mechanical type limit switch, Hall-type limit switch or photoelectric limit switch.
In described piston cylinder, gas pressure is 0.1MPa ~ 0.8MPa.
The air-film thickness in described axial carrying plane air bearing surface, radial carrying cylinder air bearing surface, X direction guiding rail air bearing surface, Y-direction guide rail air bearing surface and Z-direction bearing air-float face is 10 μm ~ 20 μm.
The diameter of the cylinder air bearing surface throttle orifice on described piston cylinder and the plane air bearing surface throttle orifice on sleeve is φ 0.1mm ~ φ 1mm.
The good result of technological innovation of the present invention and generation is:
(1) the present invention has abandoned the vibration isolator technological scheme of tradition based on elastic element/mechanism, employing axial carrying plane air bearing surface, radial carrying cylinder air bearing surface carry out decoupling zero and vibration isolation to level to vertical vibration respectively, air bearing surface is without friction, rigidity is approximately zero, vibration isolator can be made to obtain approximate zero stiffness characteristic and outstanding superlow frequency vibration isolating performance, solve prior art to limit by structural rigidity, material behavior, rigidity is difficult to further reduction, the problem that rigidity and stability can not be taken into account.This is one of the present invention's innovative point being different from prior art.
(2) the present invention adopts displacement transducer, limit switch, controller, driver and voice coil motor etc. to form the position closed loop feedback control system of vertical direction and substantially horizontal, relative position between upper and lower mounting plate is accurately controlled, positioning precision can reach 10 μm of levels and more than, effectively can solve that prior art positioning precision is low, problem that positioning precision and rigidity, anti-vibration performance can not be taken into account.This is the innovative point two that the present invention is different from prior art.
(3) the present invention adopts Orthogonal Double-layer air-float guide rail to carry out decoupling zero to the horizontal rectilinear motion degrees of freedom between the upper and lower mounting plate of vibration isolator, air-float guide rail is without friction and wear, do not introduce additional stiffness, decoupling effect is good, and vibration isolator can be made to reach high position precision and anti-vibration performance; Air-floating ball bearing diagonal motion degrees of freedom is adopted to carry out decoupling zero, air-floating ball bearing is without friction and wear, do not introduce additional angular rigidity, the technological scheme that effectively can solve the decoupling zero of existing employing elastomer introduces larger additional stiffness, problem such as restriction natural frequency and low frequency vibration isolation performance etc.This is the innovative point three that the present invention is different from prior art.
(4) the present invention adopts gas pressure sensor, solenoid valve and controller, driver etc. to form pressure closed loop feedback control system, gas pressure in accurate control sleeve makes it to keep constant, gravitational equilibrium and compensation are carried out to the thrust load of vibration isolator, under the effect of radial direction carrying cylinder air bearing surface, the piston cylinder of carry load gravity freely can slide up and down along sleeve with zero stiffness, thus the gravitational equilibrium of realizing ideal and zero stiffness vibration isolating effect.This is the innovative point four that the present invention is different from prior art.
(5) the present invention adopts active actuators to carry out ACTIVE CONTROL to the relative position between upper and lower mounting plate, vibration isolator parameter can regulate in real time according to being changed by vibration isolation features of the object and working environment, thus adapt to different operating modes, there is good flexibility, adaptability and stability.This is the innovative point five that the present invention is different from prior art.
(6) the present invention adopts the eddy current damper replacing permanent magnet array based on magnetic pole, can be integrated in one with vibration isolator well, eddy current damper has comparatively ideal linear damping characteristic, can effective attenuation vibrational energy, reduce the overshoot that motor drives location, the stability of vibration isolator is provided.This is the innovative point six that the present invention is different from prior art.
Accompanying drawing explanation
Fig. 1 is the structural representation of the eddy-current damping vibration isolator removing the double-layer air flotation crossing decoupling after upper mounting plate and the decoupling zero of air-floating ball bearing angle;
Fig. 2 is the cross-sectional view of the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling and the decoupling zero of air-floating ball bearing angle;
Fig. 3 is the schematic diagram of axial carrying plane air bearing surface, radial carrying cylinder air bearing surface, X direction guiding rail air bearing surface and sphere air bearing surface;
Fig. 4 is the schematic diagram in Y-direction guide rail air bearing surface and Z-direction bearing air-float face;
Fig. 5 is tube-in-tube structure schematic diagram;
Fig. 6 is the control structure block diagram of the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling and the decoupling zero of air-floating ball bearing angle;
Fig. 7 is the schematic diagram of plane air bearing surface throttle orifice on sleeve;
Fig. 8 is the schematic diagram of cylinder air bearing surface throttle orifice and sphere air bearing surface throttle orifice on piston cylinder;
Fig. 9 is the cross-sectional view of eddy current damper;
Figure 10 is that the A-A of Z-direction permanent magnet at a kind of mounting type of sleeve inner cylindrical surface sidewall is to sectional view;
Figure 11 is that the A-A of Z-direction permanent magnet at the another kind of mounting type of sleeve inner cylindrical surface sidewall is to sectional view;
Figure 12 is a kind of mounting type schematic diagram of X, Y-direction permanent magnet surperficial sidewall under a bushing;
Figure 13 is the another kind of mounting type schematic diagram of X, Y-direction permanent magnet surperficial sidewall under a bushing.
In figure, piece number illustrates: 1 upper mounting plate, 2 lower installation boards, 3 clean compressed gas sources, 4 vibration isolator main bodys, 5 piston cylinders, 6 sleeves, 7 air-floating ball bearings, 8X is to voice coil motor, 8a X is to motor iron yoke, 8b X is to magnetic steel of motor, 8c X is to motor coil framework, 8d X is to motor coil, 9Y is to voice coil motor, 10Z is to voice coil motor, 10a Z-direction motor iron yoke, 10b Z-direction magnetic steel of motor, 10c Z-direction motor coil framework, 10d Z-direction motor coil, 10e Z-direction motor transitional part, 11X is to displacement transducer, 11aX is to grating reading head transition piece, 11b X is to grating reading head, 11c X is to glass raster chi, 12Y is to displacement transducer, 13Z is to displacement transducer, 13a Z-direction grating reading head transition piece, 13b Z-direction grating reading head, 13c Z-direction glass raster chi, 14X is to limit switch, 14aX is to limiting stopper, 14b X is to Hall switch, 14c X is to limit switch transition piece, 14d X is to limiting stopper transition piece, 15Y is to limit switch, 16Z is to limit switch, 16a Z-direction limiting stopper, 16b Z-direction Hall switch, 16c Z-direction limit switch transition piece, 17 gas pressure sensors, 18 solenoid valves, 19 controllers, 20 drivers, 21 axial carrying plane air bearing surface, 22 radial carrying cylinder air bearing surface, 23 suction ports, 24 plane air bearing surface throttle orifices, 25 cylinder air bearing surface throttle orifices, 26 tracheaes, 27 sphere air bearing surface, 28 sphere air bearing surface throttle orifices, 29X is to air-float guide rail, 30Y is to air-float guide rail, 31X direction guiding rail air bearing surface, 32Y direction guiding rail air bearing surface, 33Z is to bearing air-float face, 34 air supporting plates, 40X is to eddy current damper, 40AX is to permanent magnet, 41Y is to eddy current damper, 41AY is to permanent magnet, 42Z is to eddy current damper, 42AZ is to permanent magnet.
Embodiment
Specific embodiments of the invention are provided below in conjunction with accompanying drawing.
The eddy-current damping vibration isolator of a kind of double-layer air flotation crossing decoupling and the decoupling zero of air-floating ball bearing angle, by upper mounting plate 1, lower installation board 2, clean compressed gas source 3, tracheae 26 and vibration isolator main body 4 form, vibration isolator main body 4 is arranged between upper mounting plate 1 and lower installation board 2, clean compressed gas source 3 is communicated with vibration isolator main body 4 by tracheae 26, in the structure of described vibration isolator main body 4, the lower surface of sleeve 6 and air supporting plate 34 are lubricated by axial carrying plane air bearing surface 21 and support, piston cylinder 5 back-off is arranged in sleeve 6, and lubricate with sleeve 6 by the radial cylinder air bearing surface 22 that carries and support, air-floating ball bearing 7 is arranged between piston cylinder 5 and upper mounting plate 1, X is rigidly connected to the lower surface of air-float guide rail 29 and air supporting plate 34, sleeve 6 is lubricated and guiding by X direction guiding rail air bearing surface 31 to air-float guide rail 29 with X, lower surface and the lower installation board 2 of Y-direction air-float guide rail 30 are rigidly connected, air supporting plate 33 and lower installation board 2 are lubricated by Z-direction bearing air-float face 33 and support, air supporting plate 34 is lubricated and guiding by Y-direction guide rail air bearing surface 32 with Y-direction air-float guide rail 30, Z-direction voice coil motor 10, Z-direction displacement transducer 13, Z-direction limit switch 16, Z-direction eddy current damper 42 are arranged between piston cylinder 5 and sleeve 6, X is arranged on sleeve 6 and air supporting plate 34 between to limit switch 14, X to eddy current damper 40, Y-direction eddy current damper 41 to displacement transducer 11, X to voice coil motor 8, X, and Y-direction voice coil motor 9, Y-direction displacement transducer 12, Y-direction limit switch 15 are arranged between air supporting plate 34 and lower installation board 2, the driving force direction of Z-direction voice coil motor 10 is vertical direction, X is mutually vertical in horizontal plane to the driving force direction of voice coil motor 8 and Y-direction voice coil motor 9, X, Y, Z-direction displacement transducer 11,12,13 are consistent with the driving force direction of X, Y, Z-direction voice coil motor 8,9,10 with the line of action direction of X, Y, Z-direction limit switch 14,15,16, and the damping force direction of X, Y, Z-direction eddy current damper 40,41,42 is consistent with the driving force direction of X, Y, Z-direction voice coil motor 8,9,10 respectively, X, Y, Z-direction displacement transducer 11,12,13 are connected with the signal input part of controller 19 respectively with X, Y, Z-direction limit switch 14,15,16, the signal output part of controller 19 is connected with the signal input part of driver 20, and the signal output part of driver 20 is connected with X, Y, Z-direction voice coil motor 8,9,10 respectively.
The displacement that X, Y, Z-direction displacement transducer 11,12,13 couples of X, Y, Z-direction voice coil motor 8,9,10 export is measured, and the stroke that X, Y, Z-direction limit switch 14,15,16 couples of X, Y, Z-direction voice coil motor 8,9,10 move limits; Controller 19 is according to the feedback signal of X, Y, Z-direction displacement transducer 11,12,13 and X, Y, Z-direction limit switch 14,15,16, and control X, Y, Z-direction voice coil motor 8,9,10 accurately control the relative position between upper and lower mounting plate 1,2.
The X that described X is installed along X to voice coil motor 8 driving force direction to eddy current damper 40 by sleeve 6 lower surface sidewall is formed to permanent magnet 40A, the Y-direction permanent magnet 41A that Y-direction eddy current damper 41 is installed along Y-direction voice coil motor 9 driving force direction by sleeve 6 lower surface sidewall is formed, the Z-direction permanent magnet 42A that Z-direction eddy current damper 42 is installed along Z-direction voice coil motor 10 driving force direction by sleeve 6 inner cylindrical surface sidewall is formed, X, Y, Z-direction permanent magnet 40A, 41A, the pole orientation of 42A is perpendicular to the surface of sleeve 6, and N, S pole is alternately arranged, sleeve 6 adopts ferromagnetic material, piston cylinder 5 and air supporting plate 2 adopt non-magnetic good conductor material.
Gas pressure sensor 17 is provided with in described piston cylinder 5, piston cylinder 5 is provided with suction port 23 and solenoid valve 18, gas pressure sensor 17 is connected with the signal input part of controller 19, the signal output part of controller 19 is connected with the signal input part of driver 20, and the signal output part of driver 20 is connected with solenoid valve 18.
Described X, Y, Z-direction voice coil motor 8,9,10 are cylinder type voice coil motor or plate voice coil motor.
Described X is single rail structure or two guide rail structure to air-float guide rail 29 and Y-direction air-float guide rail 30.
Described X, Y, Z-direction displacement transducer 11,12,13 are grating scale, magnetic railings ruler, appearance grid chi or linear potentiometer.
Described X, Y, Z-direction limit switch 14,15,16 are mechanical type limit switch, Hall-type limit switch or photoelectric limit switch.
In described piston cylinder 5, gas pressure is 0.1MPa ~ 0.8MPa.
The air-film thickness in described axial carrying plane air bearing surface 21, radial carrying cylinder air bearing surface 22, X direction guiding rail air bearing surface 31, Y-direction guide rail air bearing surface 32 and Z-direction bearing air-float face 33 is 10 μm ~ 20 μm.
The diameter of the cylinder air bearing surface throttle orifice 25 on described piston cylinder 5 and the plane air bearing surface throttle orifice 24 on sleeve 6 is φ 0.1mm ~ φ 1mm.
One embodiment of the present of invention are provided below in conjunction with Fig. 1 ~ Fig. 6.In the present embodiment, during vibration isolator work, lower installation board 2 is arranged on ground, the pedestal of instrument or basic framework, and upper mounting plate 1 is connected with by the load of vibration isolation.X, Y, Z-direction voice coil motor 8,9,10 all adopt cylinder type voice coil motor.For X to voice coil motor 8, its mainly comprise X to motor iron yoke 8a, X to magnetic steel of motor 8b, X to motor coil framework 8c, X is to motor coil 8d.X is cylindrical shape to motor iron yoke 8a and X to motor coil framework 8c, and X is cylindrical to magnetic steel of motor 8b, and X is around in X on motor coil framework 8c to motor coil 8d.X forms the stator of motor to motor iron yoke 8a and X to magnetic steel of motor 8b, X forms the mover of motor to motor coil framework 8c and X to motor coil 8d.In Z-direction voice coil motor 10, Z-direction motor transitional part 10e provides the mounting structure of Z-direction motor coil framework 10c.Pass to electric current in coil during machine operation, according to electromagnetic theory, hot-wire coil can be subject to the effect of voice coil loudspeaker voice coil power in magnetic field, can be controlled the size and Orientation of motor output drive strength by the size and Orientation controlling electric current.
The mounting type of air-floating ball bearing 7 is: the lower surface of air-floating ball bearing 7 is arranged on piston cylinder 5, and is lubricated by sphere air bearing surface 27 and support, and upper surface and the upper mounting plate 1 of air-floating ball bearing 7 are rigidly connected.
X, Y, Z-direction displacement transducer 11,12,13 adopt grating scale.For Z-direction displacement transducer 13, it mainly comprises the parts such as Z-direction grating reading head transition piece 13a, Z-direction grating reading head 13b and Z-direction glass raster chi 13c, and Z-direction grating reading head transition piece 13a provides the mounting structure of Z-direction grating reading head 13b.During grating scale work, the relative displacement of itself and Z-direction glass raster chi 13c can detect by Z-direction grating reading head 13b, and gives controller 19 by signal conductor.
X, Y, Z-direction limit switch 14,15,16 adopt Hall-type limit switch.For Z-direction limit switch 16, it mainly comprises the parts such as Z-direction limiting stopper 16a, Z-direction Hall switch 16b and Z-direction limit switch transition piece 16c.Two Z-direction Hall switch 16b install back-to-back, and two Z-direction limiting stopper 16a are metallic material, are mounted opposite with the sensitivity end of Z-direction Hall switch 16b.Z-direction limit switch transition piece 16c provides the mounting structure of Z-direction Hall switch 16b.During limit switch work, when Z-direction Hall switch 16b is close to Z-direction limiting stopper 16a, Z-direction Hall switch 16b provides limit signal, and gives controller 19 by signal conductor.
In the present embodiment, Z-direction voice coil motor 10, Z-direction displacement transducer 13 and Z-direction limit switch 16 are arranged between piston cylinder 5 and sleeve 6, and it is inner to be installed in piston cylinder 5.
The carrying of vibration isolator to load realizes in the following way: clean compressed gas source 3 by tracheae 26, carry clean compressed air through solenoid valve 18, suction port 23 in piston cylinder 5.Controller 19 is according to the feedback signal of gas pressure sensor 17, the aperture of Controlling solenoid valve 18, regulate the gas flow be input in piston cylinder 5, thus the pressure of clean compressed air in regulating piston cylinder 5, clean compressed air is balanced each other, the gravity compensation of realizing ideal and zero stiffness vibration isolating effect to piston cylinder 5 active force upwards and load, piston cylinder 5 and the gravity of other component that loads on piston cylinder 5.
In the present embodiment, in piston cylinder 5, the pressure of clean compressed air is 0.4Mpa, and the effective radius of piston cylinder 5 lower surface is 100mm, then the quality of single vibration isolator carrying is: m=p × π r
2/ g ≈ 1282kg, wherein p is gas pressure, and p=0.4Mpa, r are the effective radius of piston cylinder 5 lower surface, and r=100mm, g are gravity accleration, g=9.8m/m
2.
Fig. 7 provides an embodiment of plane air bearing surface throttle orifice on sleeve.In the present embodiment, sleeve 6 lower surface is along the circumferential direction uniform 8 plane air bearing surface throttle orifices 24 around the center of circle, and diameter is φ 0.2mm.
Fig. 8 provides an embodiment of cylinder air bearing surface throttle orifice and sphere air bearing surface throttle orifice on piston cylinder.In the present embodiment, piston cylinder 5 sidewall along the circumferential direction uniform two arranges cylinder air bearing surface throttle orifices 25, and the quantity of often arranging cylinder air bearing surface throttle orifice 25 is 8, and diameter is φ 0.2mm.The concave spherical surface of piston cylinder 5 upper surface is along the circumferential direction uniformly distributed 8 sphere air bearing surface throttle orifices 28 around the center of circle, diameter is φ 0.2mm.
An embodiment of Z-direction eddy current damper is provided below in conjunction with Fig. 9, Figure 10.In the present embodiment, vibration isolator has two Z-direction eddy current dampers 42, is made up of the Z-direction permanent magnet 42A array being arranged on sleeve 6 inner cylindrical surface sidewall, sleeve 6 adopts No. 45 Steel materials, have higher permeability, piston cylinder 5 adopts red copper material, not magnetic conduction and have high conductivity.Z-direction permanent magnet 42A is bar shaped, along the driving force direction of Z-direction voice coil motor 10, namely the axial direction of sleeve 6 arrange, pole orientation is perpendicular to the inner cylindrical surface of sleeve 6, and N, S pole is alternately arranged.When sleeve 6 produces Z-direction relative movement with piston cylinder 5, piston cylinder 5 cutting magnetic line and produce electric convolution and damping force, Z-direction damping force is directly proportional to the Z-direction speed of related movement of piston cylinder 5 to sleeve 6, direction is consistent with the driving force direction of Z-direction voice coil motor 10, the i.e. axial direction of sleeve 6, reach consumption vibrational energy, improve the object of position stability.
Fig. 9, Figure 11 give another embodiment of Z eddy current damper.In the present embodiment, vibration isolator has four Z-direction eddy current dampers 42, is made up of the Z-direction permanent magnet 42A array being arranged on sleeve 6 inner cylindrical surface sidewall.Z-direction permanent magnet 42A is bar shaped, along the driving force direction of Z-direction voice coil motor 10, namely the axial direction of sleeve 6 arrange, pole orientation is perpendicular to the inner cylindrical surface of sleeve 6, and N, S pole is alternately arranged.
An embodiment of X, Y-direction eddy current damper is provided below in conjunction with Fig. 9, Figure 12.In the present embodiment, vibration isolator has two X to eddy current damper 40, two Y-direction eddy current dampers 41, respectively by being arranged on the X of sleeve 6 lower surface sidewall, Y-direction permanent magnet 40A, 41A array forms, sleeve 6 adopts No. 45 Steel materials, have higher permeability, air supporting plate 34 adopts red copper material, not magnetic conduction and have high conductivity.X, Y-direction permanent magnet 40A, 41A are elongate in shape, and the driving force direction respectively along X, Y-direction voice coil motor 8,9 is arranged, pole orientation is perpendicular to the lower surface of sleeve 6, and N, S pole is alternately arranged.When sleeve 6 produces relative movement with air supporting plate 34, air supporting plate 34 cutting magnetic line and produce electric convolution and damping force, X, Y-direction damping force are directly proportional to the speed of related movement of air supporting plate 34 in X, Y-direction to sleeve 6, direction is consistent with the driving force direction of X, Y-direction voice coil motor 8,9, reach consumption vibrational energy, improve the object of position stability.
Fig. 9, Figure 13 give another embodiment of X, Y-direction eddy current damper.In the present embodiment, vibration isolator has an X to eddy current damper 40, a Y-direction eddy current damper 41, respectively by being arranged on the X of sleeve 6 lower surface sidewall, Y-direction permanent magnet 40A, 41A array forms.X, Y-direction permanent magnet 40A, 41A are elongate in shape, and the driving force direction respectively along X, Y-direction voice coil motor 8,9 is arranged, pole orientation is perpendicular to the lower surface of sleeve 6, and N, S pole is alternately arranged.
Claims (10)
1. the eddy-current damping vibration isolator of a double-layer air flotation crossing decoupling and the decoupling zero of air-floating ball bearing angle, by upper mounting plate (1), lower installation board (2), clean compressed gas source (3), tracheae (26) and vibration isolator main body (4) composition, vibration isolator main body (4) is arranged between upper mounting plate (1) and lower installation board (2), clean compressed gas source (3) is connected with vibration isolator main body (4) by tracheae (26), it is characterized in that: in the structure of described vibration isolator main body (4), the lower surface of sleeve (6) and air supporting plate (34) are lubricated by axial carrying plane air bearing surface (21) and support, piston cylinder (5) back-off is arranged in sleeve (6), and lubricate with sleeve (6) by the radial cylinder air bearing surface (22) that carries and support, air-floating ball bearing (7) is arranged between piston cylinder (5) and upper mounting plate (1), X is rigidly connected to the lower surface of air-float guide rail (29) and air supporting plate (34), sleeve (6) is lubricated and guiding by X direction guiding rail air bearing surface (31) to air-float guide rail (29) with X, lower surface and the lower installation board (2) of Y-direction air-float guide rail (30) are rigidly connected, air supporting plate (34) and lower installation board (2) are lubricated by Z-direction bearing air-float face (33) and support, air supporting plate (34) is lubricated and guiding by Y-direction guide rail air bearing surface (32) with Y-direction air-float guide rail (30), Z-direction voice coil motor (10), Z-direction displacement transducer (13), Z-direction limit switch (16), Z-direction eddy current damper (42) is arranged between piston cylinder (5) and sleeve (6), X is to voice coil motor (8), X is to displacement transducer (11), X is to limit switch (14), X is to eddy current damper (40), Y-direction eddy current damper (41) is arranged between sleeve (6) and air supporting plate (34), Y-direction voice coil motor (9), Y-direction displacement transducer (12), Y-direction limit switch (15) is arranged between air supporting plate (34) and lower installation board (2), the driving force direction of Z-direction voice coil motor (10) is vertical direction, X is mutually vertical in horizontal plane to the driving force direction of voice coil motor (8) and Y-direction voice coil motor (9), X, Y, Z-direction displacement transducer (11, 12, 13) and X, Y, Z-direction limit switch (14, 15, 16) line of action direction and X, Y, Z-direction voice coil motor (8, 9, 10) driving force direction is consistent, X, Y, Z-direction eddy current damper (40, 41, 42) damping force direction respectively with X, Y, Z-direction voice coil motor (8, 9, 10) driving force direction is consistent, X, Y, Z-direction displacement transducer (11,12,13) are connected with the signal input part of controller (19) respectively with X, Y, Z-direction limit switch (14,15,16), the signal output part of controller (19) is connected with the signal input part of driver (20), and the signal output part of driver (20) is connected with X, Y, Z-direction voice coil motor (8,9,10) respectively.
2. the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling according to claim 1 and the decoupling zero of air-floating ball bearing angle, it is characterized in that: the X that described X is installed along X to voice coil motor (8) driving force direction to eddy current damper (40) by sleeve (6) lower surface sidewall is formed to permanent magnet (40A), the Y-direction permanent magnet (41A) that Y-direction eddy current damper (41) is installed along Y-direction voice coil motor (9) driving force direction by sleeve (6) lower surface sidewall is formed, the Z-direction permanent magnet (42A) that Z-direction eddy current damper (42) is installed along Z-direction voice coil motor (10) driving force direction by sleeve (6) inner cylindrical surface sidewall is formed, X, Y, Z-direction permanent magnet (40A, 41A, pole orientation 42A) is perpendicular to the surface of sleeve (6), and N, S pole is alternately arranged, sleeve (6) adopts ferromagnetic material, piston cylinder (5) and air supporting plate (34) adopt non-magnetic good conductor material.
3. the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling according to claim 1 and the decoupling zero of air-floating ball bearing angle, it is characterized in that: in described piston cylinder (5), be provided with gas pressure sensor (17), piston cylinder (5) is provided with suction port (23) and solenoid valve (18), gas pressure sensor (17) is connected with the signal input part of controller (19), the signal output part of controller (19) is connected with the signal input part of driver (20), the signal output part of driver (20) is connected with solenoid valve (18).
4. the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling according to claim 1 and the decoupling zero of air-floating ball bearing angle, is characterized in that: described X, Y, Z-direction voice coil motor (8,9,10) are cylinder type voice coil motor or plate voice coil motor.
5. the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling according to claim 1 and the decoupling zero of air-floating ball bearing angle, is characterized in that: described X is single rail structure or two guide rail structure to air-float guide rail (29) and Y-direction air-float guide rail (30).
6. the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling according to claim 1 and the decoupling zero of air-floating ball bearing angle, is characterized in that: described X, Y, Z-direction displacement transducer (11,12,13) are grating scale, magnetic railings ruler, appearance grid chi or linear potentiometer.
7. the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling according to claim 1 and the decoupling zero of air-floating ball bearing angle, is characterized in that: described X, Y, Z-direction limit switch (14,15,16) are mechanical type limit switch, Hall-type limit switch or photoelectric limit switch.
8. the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling according to claim 1 and the decoupling zero of air-floating ball bearing angle, is characterized in that: described piston cylinder (5) interior gas pressure is 0.1MPa ~ 0.8MPa.
9. the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling according to claim 1 and the decoupling zero of air-floating ball bearing angle, is characterized in that: the air-film thickness in described axial carrying plane air bearing surface (21), radial carrying cylinder air bearing surface (22), X direction guiding rail air bearing surface (31), Y-direction guide rail air bearing surface (32) and Z-direction bearing air-float face (33) is 10 μm ~ 20 μm.
10. the eddy-current damping vibration isolator of double-layer air flotation crossing decoupling according to claim 1 and the decoupling zero of air-floating ball bearing angle, is characterized in that: the diameter of the cylinder air bearing surface throttle orifice (25) on described piston cylinder (5) and the plane air bearing surface throttle orifice (24) on sleeve (6) is φ 0.1mm ~ φ 1mm.
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| CN201210575350.1A CN103062311B (en) | 2012-12-19 | 2012-12-19 | Eddy current damping vibration isolator of double-layer air-flotation orthogonal decoupling and air-flotation ball bearing angle decoupling |
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| CN201210575350.1A CN103062311B (en) | 2012-12-19 | 2012-12-19 | Eddy current damping vibration isolator of double-layer air-flotation orthogonal decoupling and air-flotation ball bearing angle decoupling |
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| EP1160628A2 (en) * | 2000-06-02 | 2001-12-05 | Asm Lithography B.V. | Supporting assembly for lithographic projection apparatus |
| CN1132988C (en) * | 1996-12-11 | 2003-12-31 | 三菱重工业株式会社 | Large high-strength vibration isolating device |
| CN102543217A (en) * | 2012-01-20 | 2012-07-04 | 澳门大学 | Macro-micro driven bidimensional integrated micro positioning platform |
| CN102734379A (en) * | 2012-06-09 | 2012-10-17 | 哈尔滨工业大学 | Active vibration isolating device based on composite support of electromagnetism and static-pressure air floatation |
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| JP2006307932A (en) * | 2005-04-27 | 2006-11-09 | Sumitomo Heavy Ind Ltd | Vibration isolation system |
| US8282281B2 (en) * | 2007-02-14 | 2012-10-09 | Integrated Dynamics Engineering Gmbh | Air bearing with consideration of high-frequency resonances |
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| CN1132988C (en) * | 1996-12-11 | 2003-12-31 | 三菱重工业株式会社 | Large high-strength vibration isolating device |
| EP1160628A2 (en) * | 2000-06-02 | 2001-12-05 | Asm Lithography B.V. | Supporting assembly for lithographic projection apparatus |
| CN102543217A (en) * | 2012-01-20 | 2012-07-04 | 澳门大学 | Macro-micro driven bidimensional integrated micro positioning platform |
| CN102734379A (en) * | 2012-06-09 | 2012-10-17 | 哈尔滨工业大学 | Active vibration isolating device based on composite support of electromagnetism and static-pressure air floatation |
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