CN104362895B - A kind of single excitation linear ultrasonic motor - Google Patents
A kind of single excitation linear ultrasonic motor Download PDFInfo
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- CN104362895B CN104362895B CN201410740286.7A CN201410740286A CN104362895B CN 104362895 B CN104362895 B CN 104362895B CN 201410740286 A CN201410740286 A CN 201410740286A CN 104362895 B CN104362895 B CN 104362895B
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Abstract
The invention discloses a kind of single excitation linear ultrasonic motor, mover includes draw runner and is arranged on the frictional layer on draw runner surface；Stator includes single-excitation ultrasonic oval vibration energy converter, elliptical vibration modal transducer and is arranged on the friction-driven block of elliptical vibration modal transducer front end；Described single-excitation ultrasonic oval vibration energy converter includes that back shroud, piezoelectric ceramic piece, electrode slice and front shroud are coupled compression by bolt by bolt and the back shroud being sequentially sleeved on bolt, piezoelectric ceramic piece, electrode slice and front shroud, back shroud and front shroud；Elliptical vibration modal transducer is arranged on the front end of single-excitation ultrasonic oval vibration energy converter, for straight beam and the composite construction of cant beam, the longitudinal ultrasonic vibration that single-excitation ultrasonic oval vibration energy converter produces can be converted to the vertical curved composite ultrasonic elliptical vibratory of elliptical vibration modal transducer end and friction-driven block by this elliptical vibration modal transducer, and drives mover to carry out continuous linear motion.
Description
Technical field
The present invention relates to the use of the ultrasound electric machine field of piezoelectric ceramics inverse piezoelectric effect, especially relate to a kind of linear ultrasonic motor utilizing single excitation ultrasonic elliptical vibratory.
Background technology
Linear ultrasonic motor is the novel micro machine of one developing rapidly and applying the eighties in 20th century, it is to utilize the inverse piezoelectric effect of piezoelectric to realize the electric coupling apparatus that electric energy-mechanic can be changed, by the rubbing action between stator and mover, the micro breadth oscillation of elastomer is converted into macroscopical straight line (rotation) motion of mover, pushes directly on load.Because of its have that volume is little, lightweight, low-speed big, noise are little, response is fast, positioning precision is high, without advantages such as electromagnetic interference and environmental suitability are strong, obtained increasingly extensive application in technical fields such as medical treatment, Aero-Space, robot, MEMS.
Single excitation mode conversion type ultrasound electric machine is the one of ultrasound electric machine, and it is the excitation utilizing one group of piezo ceramic element, makes stator generation have the complex vibration of two kinds of mode of oscillation components by the modal transducer of special construction.If there is certain phase contrast between the two mode of oscillation and frequency being close, on stator and rotor contact interface, the end face particle of stator will produce elliptic vibrations, thus obtained motion and the moment of torsion of rotor by the friction between stator and rotor.The ultrasound electric machine utilizing MODAL TRANSFORMATION OF A principle to make has only to one group of control circuit and drives power supply, controls drive system simple, and manufacturing cost, control difficulty all can be reduced.
Quickly, the colleges and universities such as Tsing-Hua University, Nanjing Aero-Space University, Harbin Institute of Technology successively expand research to linear ultrasonic motor in the research and development of current domestic linear ultrasonic motor.Since two thousand four, Chinese patent net has published annular standing wave linear ultrasonic motor [200510046044.9], prism longitudinal bend composite vibrator linear supersonic motor [200610132316.1], triangle bended plate type piezoelectric straight line ultrasound electric motor [200710045921.X], H-shaped standing wave linear ultrasonic motor oscillator [200820014739.8], column structure dual-wheel foot driving linear ultrasonic motor and the patent such as electric excitation method thereof [200710020963.8], K shape linear ultrasonic motor [200810124426.2] based on continuous amplitude transformer principle successively.But existing linear ultrasonic motor also exists, and structure is complicated, output is little, manufacture is difficult, to manufacturing the deficiencies such as matching requirements are higher, relatively costly and the life-span is short, driving force is little.These problems constrain they application in the industrial production.
Summary of the invention
The invention provides a kind of novel list excitation linear ultrasonic motor in order to overcome present in above-mentioned linear ultrasonic motor not enough, it is provided that a kind of simple in construction, output are big, low cost, life-span length, linear ultrasonic motor that driving force is big.
A kind of single excitation linear ultrasonic motor, including stator and mover, described mover includes draw runner and is arranged on the frictional layer on draw runner surface；Described stator includes single-excitation ultrasonic oval vibration energy converter, elliptical vibration modal transducer and friction-driven block；Described single-excitation ultrasonic oval vibration energy converter is overall in cylinder, it includes bolt and the back shroud being sequentially sleeved on bolt, piezoelectric ceramic piece, electrode slice and front shroud, the ring flange that can couple it is provided with other constructional device on front shroud, back shroud, piezoelectric ceramic piece, electrode slice and front shroud are coupled compression by bolt by back shroud and front shroud, constitute single energy conversion part encouraging linear ultrasonic motor, the ultrasonic electric energy that ultrasonic-frequency power supply exports is converted to the ultrasonic vibrational energy of ultrasonic transducer.
Described elliptical vibration modal transducer and front shroud are fabricated to a front end being integrally provided in front shroud, or the welding of elliptical vibration modal transducer is arranged on the front end of front shroud, described elliptical vibration modal transducer includes the composite construction that straight beam and cant beam are constituted, straight beam and cant beam are perpendicular to the cross section of its center axis and are rectangle, the central axis of straight beam and the central axes of single-excitation ultrasonic oval vibration energy converter, one end of straight beam couples with the front shroud of ultrasonic transducer, and the other end overhangs；The side of one end of cant beam and the front shroud off-center axis of ultrasonic transducer couples, the middle part of the other end and straight beam couples, the central axis of cant beam becomes 0 ~ 90 degree of angle, straight beam and cant beam to be arc transition with the connection place of ultrasonic transducer front shroud to couple with the central axis of straight beam.
The molectron that elliptical vibration modal transducer is constituted after being arranged on single-excitation ultrasonic oval vibration energy converter front end is referred to as single excitation ultrasonic elliptical vibratory transducer, elliptical vibration modal transducer is that the purpose of straight beam and cant beam composite construction is in order to change single mode of oscillation encouraging ultrasonic elliptical vibratory transducer so that it is longitudinal vibration mode frequency and flexural vibration mode frequency are close or equal；Existence due to oblique beam structure, the longitudinal ultrasonic vibration that single-excitation ultrasonic oval vibration energy converter produces is after being delivered to cant beam, it is decomposed into a part of extensional vibration component and a part of bending vibration component at cant beam root, the extensional vibration component that decomposes when cant beam and after bending vibration component is delivered to straight beam, it is combined mutually with the extensional vibration propagated on straight beam, finally in the formation of straight beam end, there is the extensional vibration component of certain phase contrast and the ultrasonic elliptical vibratory that bending vibration component is compound.
Described friction-driven block is arranged on the front end of elliptical vibration modal transducer by welding, bonding or screw attachment mode, and friction-driven block contacts with the frictional layer on draw runner.The ring flange of single-excitation ultrasonic oval vibration energy converter is used for installing stator and precompression device, stator and mover connects into one and is monolithically fabricated single excitation linear ultrasonic motor, and the single-excitation ultrasonic oval vibration energy converter axis after ring flange is fixing is 20 degree ~ 160 degree with the angle of draw runner.
After the ultrasonic electric signal of ultrasonic-frequency power supply output is linked into the electrode slice of single-excitation ultrasonic oval vibration energy converter, single-excitation ultrasonic oval vibration energy converter i.e. produces supersonic vibration, ultrasonic vibrational energy is after single-excitation ultrasonic oval vibration energy converter is delivered to elliptical vibration modal transducer end, the extensional vibration being converted to there is certain phase contrast and the compound vertical curved composite ultrasonic elliptical vibratory of bending vibration, i.e. be converted to the vertical curved composite ultrasonic elliptical vibratory of elliptical vibration modal transducer end, and drive friction-driven block to do ultrasonic elliptical vibratory together with elliptical vibration modal transducer end, and then drive mover to carry out continuous linear motion.Compare the list excitation linear ultrasonic motor that existing document is introduced, this linear ultrasonic motor has that power capacity is big, energy conversion efficiency is high, simple in construction, easy to manufacture, low cost, the rigidity of structure big, it is simple to control drive system and the advantage such as vibration stable work in work.
Further, described list excitation linear ultrasonic motor only has one group of extensional vibration piezoelectric ceramic piece.
Further, described list excitation linear ultrasonic motor Zhi Xu mono-road ultrasonic electric signal excitation.
Present invention employs mechanical vibration MODAL TRANSFORMATION OF A mechanism and the extensional vibration conversion of single-excitation ultrasonic oval vibration energy converter is decomposed into the extensional vibration of straight beam, the extensional vibration of cant beam and bending vibration component, finally synthesize vertical curved composite ultrasonic elliptical vibratory at straight beam end, simplify single overall structure encouraging linear ultrasonic motor, greatly reduce the complexity of vibrational system, reduce manufacture, assembly difficulty and production cost, whole single excitation linear ultrasonic motor simple in construction, easy to manufacture, be conducive to being miniaturized the realization of target；Additionally this invention only needs a road control circuit and ultrasonic electric signal to encourage, control difficulty low, avoid two-phase or multiphase supersonic vibration and be compounded to form the complicated ultrasonic-frequency power supply development cost of elliptical vibration transducer, simplify control circuit and ultrasonic-frequency power supply structure, reduce control circuit and ultrasonic-frequency power supply cost, reduce control circuit and ultrasonic-frequency power supply volume, it is easily achieved the miniaturization of control circuit and ultrasonic-frequency power supply, integrated, improve reliability, service behaviour is more stable, has a extensive future.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the application example schematic diagram of the present invention.
Label declaration in figure: 1. bolt, 2. back shroud, 3. piezoelectric ceramic piece, 4. electrode slice, 5. front shroud, 6. ring flange, 7. elliptical vibration modal transducer, 8. draw runner, 9. frictional layer, 10 friction-driven blocks, 11. ultrasonic-frequency power supplies.
Detailed description of the invention
In conjunction with Fig. 1, shown in 2, a kind of single excitation linear ultrasonic motor, including stator and mover, mover includes draw runner 8 and is bonded in the frictional layer 9 on draw runner 8 surface；Stator includes single-excitation ultrasonic oval vibration energy converter, elliptical vibration modal transducer 7 and friction-driven block 10；Single-excitation ultrasonic oval vibration energy converter is overall in cylinder, it includes bolt 1 and the back shroud 2 being sequentially sleeved on bolt 1, piezoelectric ceramic piece 3, electrode slice 4 and front shroud 5, the ring flange 6 that can couple it is provided with other constructional device on front shroud 5, back shroud 2, piezoelectric ceramic piece 3, electrode slice 4 and front shroud 5 are coupled compression by bolt 1 by back shroud 2 and front shroud 5, constituting single energy conversion part encouraging linear ultrasonic motor, the ultrasonic electric energy exported by ultrasonic-frequency power supply 11 is converted to the ultrasonic vibrational energy of single-excitation ultrasonic oval vibration energy converter.This list excitation linear ultrasonic motor only has one group of extensional vibration piezoelectric ceramic piece 3, piezoelectric ceramic transducer section diameter 30mm, and the material of piezoelectric ceramic piece 3 is PZT-8, a size of:Ф 30mm ×Ф 15mm × 5mm, the sheet number of piezoelectric ceramic piece 3 is 2.
Elliptical vibration modal transducer 7 and front shroud 5 are fabricated to an one-piece parts and are arranged on the front end of front shroud 5, elliptical vibration modal transducer 7 is the composite construction of straight beam and cant beam, straight beam and cant beam are perpendicular to the cross section of its center axis and are rectangle, the central axis of straight beam and the central axes of single-excitation ultrasonic oval vibration energy converter, one end of straight beam couples with the front shroud 5 of ultrasonic transducer, the other end overhangs, and the cross section length of side of straight beam is 12×12mm, long 72mm；The side of one end of cant beam and the front shroud 5 off-center axis of ultrasonic transducer couples, the central axis distance of the connection place distance front shroud 5 of cant beam central axis and front shroud 5 is 25mm, the middle part of the other end and straight beam couples, and the cross section length of side of cant beam is 12×12mm.The central axis of cant beam becomes 30 angles, straight beam and cant beam to be arc transition with the connection place of ultrasonic transducer front shroud to couple with the central axis of straight beam, and transition arc radius is 5mm.
Friction-driven block 10 is by the bonding front end being arranged on elliptical vibration modal transducer 7, and friction-driven block 10 contacts with the frictional layer 9 on draw runner 8.The ring flange 6 utilizing single-excitation ultrasonic oval vibration energy converter carries out installing stator and precompression device, stator and mover connects into one and is monolithically fabricated single excitation linear ultrasonic motor, and the single-excitation ultrasonic oval vibration energy converter axis after ring flange 6 is fixing is 45 degree with the angle of draw runner.
Single excitation linear ultrasonic motor stator natural frequency is 19.84KHz, impedance is 76 ohm, dynamic electric resistor is 16 ohm, the ultrasonic electric signal excitation of Zhi Xu mono-road, ultrasonic-frequency power supply 11 output voltage range is 0-400V, current range is 0-4A, and output frequency is 19.84 ± 0.01KHz, and ultrasonic-frequency power supply 11 has automatic frequency tracking function in designated frequency range.
After the ultrasonic electric signal of ultrasonic-frequency power supply output is linked into the electrode slice 4 of single-excitation ultrasonic oval vibration energy converter, single-excitation ultrasonic oval vibration energy converter i.e. produces supersonic vibration, ultrasonic vibrational energy is after single-excitation ultrasonic oval vibration energy converter is delivered to elliptical vibration modal transducer 7 end, the extensional vibration being converted to have certain phase contrast and the compound vertical curved composite ultrasonic elliptical vibratory of bending vibration, be i.e. converted to the vertical curved composite ultrasonic elliptical vibratory of elliptical vibration modal transducer 7 end；And drive friction-driven block 10 to do ultrasonic elliptical vibratory together with elliptical vibration modal transducer 7 end.After running 10 minutes, system reaches stable vibration state, and the output voltage of ultrasonic-frequency power supply 11 is 220V, and electric current is 1.35A, after friction-driven block contacts with mover, drives mover to carry out continuous linear motion, and the velocity peak values of mover is 30.3mm/s.
Claims (6)
1. a single excitation linear ultrasonic motor, including mover and stator, it is characterised in that: mover includes draw runner and is arranged on the frictional layer on draw runner surface；Stator includes single-excitation ultrasonic oval vibration energy converter, elliptical vibration modal transducer and friction-driven block；Described single-excitation ultrasonic oval vibration energy converter is overall in cylinder, it includes bolt and the back shroud being sequentially sleeved on bolt, piezoelectric ceramic piece, electrode slice and front shroud, it is provided with the ring flange that can couple with other constructional device, back shroud and front shroud on front shroud, by bolt, back shroud, piezoelectric ceramic piece, electrode slice and front shroud is coupled compression；Described elliptical vibration modal transducer is arranged on the front end of front shroud, described elliptical vibration modal transducer includes the composite construction that straight beam and cant beam are constituted, straight beam and cant beam are perpendicular to the cross section of its center axis and are rectangle, the central axis of straight beam and the central axes of single-excitation ultrasonic oval vibration energy converter, one end of straight beam couples with the front shroud of ultrasonic transducer, and the other end overhangs；The side of one end of cant beam and the front shroud off-center axis of ultrasonic transducer couples, the middle part of the other end and straight beam couples, the central axis of cant beam becomes 0 ~ 90 degree of angle, straight beam and cant beam to be arc transition with the connection place of ultrasonic transducer front shroud to couple with the central axis of straight beam；Described friction-driven block is arranged on the front end of elliptical vibration modal transducer；The angle between single-excitation ultrasonic oval vibration energy converter axis and draw runner after ring flange and support are fixing is 20 degree ~ 160 degree；Described list excitation linear ultrasonic motor only has one group of extensional vibration piezoelectric ceramic piece；Described list excitation linear ultrasonic motor Zhi Xu mono-road ultrasonic electric signal excitation.
Single excitation linear ultrasonic motor the most according to claim 1, it is characterised in that: described elliptical vibration modal transducer and front shroud are fabricated to a front end being integrally provided in front shroud.
Single excitation linear ultrasonic motor the most according to claim 1, it is characterised in that: described elliptical vibration modal transducer welding is arranged on the front end of front shroud.
4. encourage linear ultrasonic motor according to the list described in claim 1 or 2 or 3, it is characterised in that: described friction-driven block is arranged on the front end of elliptical vibration modal transducer by welding.
5. encourage linear ultrasonic motor according to the list described in claim 1 or 2 or 3, it is characterised in that: described friction-driven block passes through the bonding front end being arranged on elliptical vibration modal transducer.
6. encourage linear ultrasonic motor according to the list described in claim 1 or 2 or 3, it is characterised in that: also include a joint bolt, for friction-driven block being connected in the front end of elliptical vibration modal transducer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410740286.7A CN104362895B (en) | 2014-12-09 | 2014-12-09 | A kind of single excitation linear ultrasonic motor |
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| CN201410740286.7A CN104362895B (en) | 2014-12-09 | 2014-12-09 | A kind of single excitation linear ultrasonic motor |
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| CN104362895A CN104362895A (en) | 2015-02-18 |
| CN104362895B true CN104362895B (en) | 2016-11-30 |
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| CN110138262B (en) * | 2019-05-24 | 2024-02-02 | 华侨大学 | Linear ultrasonic motor with single excitation source for bidirectional actuation |
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| CN101804575B (en) * | 2010-03-05 | 2013-05-01 | 清华大学 | Elliptical ultrasonic vibration auxiliary cutting device with adjustable track |
| CN102120302A (en) * | 2010-12-30 | 2011-07-13 | 河南理工大学 | Single-excitation elliptical ultrasonic vibration finishing device |
| CN103199731B (en) * | 2013-05-08 | 2015-09-02 | 苏州科技学院 | One singly encourages linear ultrasonic motor |
| CN203225675U (en) * | 2013-05-08 | 2013-10-02 | 苏州科技学院 | Bidirectional-driving linear ultrasonic motor |
| CN103414370B (en) * | 2013-08-26 | 2015-09-02 | 苏州科技学院 | Singly encourage linear ultrasonic motor |
| CN103447557B (en) * | 2013-08-26 | 2015-11-18 | 苏州科技学院 | Single excitation ultrasonic elliptical vibratory truning fixture |
| CN204271943U (en) * | 2014-12-09 | 2015-04-15 | 苏州科技学院 | One singly encourages linear ultrasonic motor |
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