CN102185519A - Mode conversion type piezoelectric thread transmission linear ultrasonic motor - Google Patents
Mode conversion type piezoelectric thread transmission linear ultrasonic motor Download PDFInfo
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- CN102185519A CN102185519A CN2011101204873A CN201110120487A CN102185519A CN 102185519 A CN102185519 A CN 102185519A CN 2011101204873 A CN2011101204873 A CN 2011101204873A CN 201110120487 A CN201110120487 A CN 201110120487A CN 102185519 A CN102185519 A CN 102185519A
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Abstract
The invention discloses a mode conversion type piezoelectric thread transmission linear ultrasonic motor which comprises a stator and a rotor, wherein the stator comprises a support bracket, a longitudinal vibration piezoelectric ceramic wafer module unit and a longitudinal-torsional mode converter, wherein the centre of the support bracket is provided with an annular slice used to fix the motor, and the longitudinal vibration piezoelectric ceramic wafer unit is fixed between the support bracket and the longitudinal-torsional mode converter by means of thread compaction; and the rotor is a cylinder of which the cylindrical surface is processed with an external thread and is matched with the internal thread of the longitudinal-torsional mode converter via the external thread. The motor provided by the invention has a simple structure, is convenient to process, assemble, install and use, and has high working efficiency, high output precision and a wide application range.
Description
Technical field
The present invention relates to a kind of linear type ultrasound motor, particularly a kind of MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor.
Background technology
Ultrasound electric machine is to utilize the inverse piezoelectric effect of piezoelectric ceramic and the novel electrical micro-machine of ultrasonic vibration, outstanding advantage such as have that low speed high torque, volume are little, in light weight, compact conformation, response are fast, low noise, no electromagnetic interference, position and speed control are good has a wide range of applications in fields such as Industry Control, precision instrumentation, Aero-Space, automobile specified electrical equipment, intelligent robot and medical instruments.Ultrasound electric machine can be divided into two big classes according to required driving source: the one, produce the required vibration of stator by the excitation of two-phase power supply, and the 2nd, obtain the required vibration of stator by the single phase poaer supply excitation, MODAL TRANSFORMATION OF A type ultrasound electric machine belongs to second class; Can be divided into two classes again by its method that realizes MODAL TRANSFORMATION OF A: the one, produce the mode of conversion by the coupling between the stator and rotor structure.The 2nd, utilize the structure of stator body to produce the mode of conversion.
MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor is linear movement output directly, has higher straight line positioning accuracy simultaneously, compare with other ultrasound electric machines have simple in structure, only need the advantage of single-phase excitation.
Based on above analysis, the inventor attempts to research and develop a kind of MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor, and this case produces thus.
Summary of the invention
Technical problem to be solved by this invention is at defective in the aforementioned background art and deficiency, and a kind of MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor is provided, it is simple in structure, is convenient to processing, assembling, installs and uses high efficiency, the output accuracy height, applied range.
The present invention is for solving above technical problem, and the technical scheme that is adopted is:
A kind of MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor, comprise stator and mover, described stator comprises bracing frame, longitudinal vibration piezoelectric ceramic piece group and longitrorse MODAL TRANSFORMATION OF A device, wherein, be provided with the ring plate that is used for fixing motor in the middle of the bracing frame, the mode that longitudinal vibration piezoelectric ceramic piece group compresses by screw thread is fixed between bracing frame and the longitrorse MODAL TRANSFORMATION OF A device; Described mover is to be processed with externally threaded cylinder on the external cylindrical surface, by the screw-internal thread fit on external screw thread and the longitrorse MODAL TRANSFORMATION OF A device.
Above-mentioned longitudinal vibration piezoelectric ceramic piece group is that the longitudinal vibration ring piezoelectric stacks or the annular longitudinal vibration potsherd of unidirectional polarization rearranges in order.
After adopting such scheme, the present invention utilizes the inverse piezoelectric effect of piezoelectric ceramic piece, swash and elastomeric extensional vibration, owing to have groove on the elastomer, this extensional vibration is converted into twisting vibration, rubbing action by screw thread pair makes the mover rotation and vertically moves along straight line, and the linear type ultrasound motor that is developed into.
In the preceding half period, stator drives screw thread and is in it more than extensional vibration equilbrium position, fixed, mover contact, and stator is the torsional oscillation speed that it had, and passes to rotor by the rubbing action between fixed, mover screw thread pair, and mover is also rotated; In the later half cycle, stator drives screw thread and is in it below extensional vibration equilbrium position, disengages between fixed, mover screw thread, and the reverse torsional oscillation speed that stator had passes less than mover, and mover relies on its inertia to continue to be rotated counterclockwise.Because the rubbing action between screw thread pair, rotatablely moving of mover just is converted into mover rectilinear motion longitudinally.
The difference of the longitudinal-torsional compound ultrasonic motor maximum of this type motor and other type is exactly that it does not need two groups of piezoelectric ceramic to come the longitudinal vibration mode and the torsional oscillation mode of exciting electric, only need one group of longitudinal vibration potsherd (d33 effect) excitation, can convert extensional vibration to twisting vibration by the effect of MODAL TRANSFORMATION OF A device.Thereby there is not the conforming problem of model frequency in this in theory motor, made things convenient for the design of motor widely from design angle.In fact, longitrorse MODAL TRANSFORMATION OF A type ultrasound electric machine has only an operation mode, i.e. longitrorse coupled mode, and its rotating is respectively to carry out work under the longitrorse coupled mode of two different frequencies.
Description of drawings
Fig. 1 is the structural front view of first embodiment of the invention;
Fig. 2 is the A-A cutaway view of Fig. 1;
Fig. 3 is the structural front view of second embodiment of the invention;
Fig. 4 is the B-B cutaway view of Fig. 3;
Fig. 5 is the bending vibation mode picture of first embodiment of the invention;
Fig. 6 is the bending vibation mode picture of second embodiment of the invention;
Fig. 7 puts on the piezoelectric ceramic group to realize motor forward and reverse electric excitation signal;
Fig. 8 is the operation principle schematic diagram of first embodiment of the invention;
Fig. 9 is the operation principle schematic diagram of second embodiment of the invention.
Embodiment
Below with reference to drawings and the specific embodiments structure of the present invention is elaborated.
The invention provides a kind of MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor, comprise stator and mover, stationary part is made up of bracing frame, longitudinal vibration piezoelectric ceramic piece group and longitrorse MODAL TRANSFORMATION OF A device, ring plate is used for fixing motor in the middle of the support frame as described above, bracing frame is extended with outer surface and is processed with externally threaded pipe, is used to install longitudinal vibration piezoelectric ceramic piece group and longitrorse MODAL TRANSFORMATION OF A device; Longitudinal vibration piezoelectric ceramic piece group adopts the ring-type piezoelectric ceramic piece, is sleeved on the stretching out on the pipe of bracing frame; Longitrorse MODAL TRANSFORMATION OF A device is connected by the external screw thread that internal thread and bracing frame stretch out pipe, and for longitudinal vibration piezoelectric ceramic piece group provides pretightning force, wherein bracing frame, longitudinal vibration piezoelectric ceramic piece group and longitrorse MODAL TRANSFORMATION OF A device form a sandwich Langevin-type transducer structure.Described mover is to be processed with externally threaded cylinder on the external cylindrical surface, by the screw-internal thread fit on external screw thread and the longitrorse MODAL TRANSFORMATION OF A device.The present invention is described in detail below with reference to concrete enforcement structure.
As depicted in figs. 1 and 2, be the first enforcement structure of the stator of MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor provided by the present invention, comprise bracing frame 1, longitudinal vibration piezoelectric ceramic piece group 2 and longitrorse MODAL TRANSFORMATION OF A device 3.
Described longitudinal vibration piezoelectric ceramic piece group comprises two groups, and first group comprises longitudinal vibration piezoelectric ceramic piece 2-1 and longitudinal vibration piezoelectric ceramic piece 2-2, and second group comprises longitudinal vibration piezoelectric ceramic piece 2-3 and longitudinal vibration piezoelectric ceramic piece 2-4; Described longitrorse MODAL TRANSFORMATION OF A device 3 comprises longitrorse MODAL TRANSFORMATION OF A device 3-1 and longitrorse MODAL TRANSFORMATION OF A device 3-2.Above-mentioned two groups of longitudinal vibration piezoelectric ceramic piece 2-1,2-2 and 2-3,2-4 grouping are sleeved on the two ends of bracing frame 1 and stretch out on the pipe, form symmetrical structure.Described longitrorse MODAL TRANSFORMATION OF A device 3-1 and 3-2 stretch out on the pipe by the two ends that are threaded in support frame as described above 1 respectively, form symmetrical structure.
As depicted in figs. 1 and 2, the mover 4 of the MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor in the present embodiment for being processed with externally threaded cylinder, cooperates by screw thread and above-mentioned longitrorse MODAL TRANSFORMATION OF A device 3-1,3-2.
Described longitrorse MODAL TRANSFORMATION OF A device 3-1,3-2 are round tubes, have the structure that array rectangular channel or array circular hole etc. have longitrorse MODAL TRANSFORMATION OF A function on its tube wall, and inside one end of round tube are processed with internal thread.
Described longitudinal vibration piezoelectric ceramic piece 2-1,2-2,2-3,2-4 are circular ring-type potsherd, every piezoelectric ceramic piece electroplate, subregion not, unidirectional polarization.Piezoelectric ceramic piece after the polarization is subjected to electric field action can produce distortion.Because the d33 piezoelectric effect of piezoelectric ceramic, piezoelectric ceramic piece is under the changing electric field effect, vertical shortening (or elongation) 5 and 6 as shown in Figure 5 can take place, pass through the conversion of longitrorse MODAL TRANSFORMATION OF A device 3 respectively, obtain as shown in Figure 5 with longitrorse MODAL TRANSFORMATION OF A device 3 on rotation direction identical (or counterclockwise) clockwise of groove reverse 7 and 8, the two coupling obtains longitrorse coupled mode, drives described mover 4 and rotates, because the effect of threaded engagement, mover 4 reveals rectilinear motion at vertical table.
Please refer to Fig. 3 and shown in Figure 4 again, be second kind of the present invention and implement structure, comprise bracing frame 1, longitudinal vibration piezoelectric ceramic piece group 2 and longitrorse MODAL TRANSFORMATION OF A device 3.
Described longitudinal vibration piezoelectric ceramic piece group 2 comprises longitudinal vibration piezoelectric ceramic piece 2-1 and longitudinal vibration piezoelectric ceramic piece 2-2.Above-mentioned longitudinal vibration piezoelectric ceramic piece 2-1,2-2 are sleeved on stretching out on the pipe of bracing frame 1.Described longitrorse MODAL TRANSFORMATION OF A device 3 is by being threaded in the stretching out on the pipe of support frame as described above 1.
As shown in Figure 3 and Figure 4, the mover 4 of the MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor in this enforcement structure for being processed with externally threaded cylinder, cooperates by screw thread and above-mentioned longitrorse MODAL TRANSFORMATION OF A device 3.
Described longitrorse MODAL TRANSFORMATION OF A device 3 is round tubes, have the structure that array rectangular channel or array circular hole etc. have longitrorse MODAL TRANSFORMATION OF A function on its tube wall, and inside one end of round tube is processed with internal thread.
Described longitudinal vibration piezoelectric ceramic piece 2-1,2-2 are circular ring-type potsherd, every piezoelectric ceramic piece electroplate, subregion not, unidirectional polarization.Piezoelectric ceramic piece after the polarization is subjected to electric field action can produce distortion.Because the d33 piezoelectric effect of piezoelectric ceramic, piezoelectric ceramic piece is under the changing electric field effect, vertical shortening (or elongation) 9 as shown in Figure 6 can take place, conversion through longitrorse MODAL TRANSFORMATION OF A device 3, obtain as shown in Figure 6 with longitrorse MODAL TRANSFORMATION OF A device 3 on rotation direction identical (or clockwise) counterclockwise of groove reverse 10, the two coupling obtains longitrorse coupled mode, drives described mover 4 and rotates, because the effect of threaded engagement, mover 4 reveals rectilinear motion at vertical table.
In addition, adopting sawtooth signal as shown in Figure 7 is drive signal, and waveform begins to rise from an a, drives the rotation of mover generation as Fig. 8 and A direction shown in Figure 9.Can see that sawtooth signal slowly rises with a very little slope before arriving peak point b, the voltage signal that is added on the longitudinal vibration piezoelectric ceramic piece group 2 at peak point b place reaches maximum, and it is maximum that the distortion of longitudinal vibration piezoelectric ceramic piece group 2 also reaches.Because magnitude of voltage slowly rises, so does not have slide relative between the matching thread of longitrorse MODAL TRANSFORMATION OF A device 3 and mover 4, mover 4 can rotate the distance of a weak point on the A direction.The signal of telecommunication from peak point b to descending suddenly the minimum point c, cause longitrorse MODAL TRANSFORMATION OF A device 3 to produce motions suddenly as Fig. 8 and B direction shown in Figure 9.Because this motion is very fast, meetings such as mechanics of system characteristic such as inertia and friction engagement hinder mover 4 to follow the axial motion of longitrorse MODAL TRANSFORMATION OF A device 3.The waveform signal of CYCLIC LOADING from an a to c can obtain the persistent movement that mover 4 produces A direction as shown in Fig. 8 and Fig. 9 and so forth, and this makes mover produce the motion of precession.
Above embodiment only for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought that proposes according to the present invention, and any change of being done on the technical scheme basis all falls within the protection range of the present invention.
Claims (2)
1. a MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor comprises stator and mover; It is characterized in that: described stator comprises bracing frame, longitudinal vibration piezoelectric ceramic piece group and longitrorse MODAL TRANSFORMATION OF A device, wherein, be provided with the ring plate that is used for fixing motor in the middle of the bracing frame, the mode that longitudinal vibration piezoelectric ceramic piece group compresses by screw thread is fixed between bracing frame and the longitrorse MODAL TRANSFORMATION OF A device; Described mover is to be processed with externally threaded cylinder on the external cylindrical surface, by the screw-internal thread fit on external screw thread and the longitrorse MODAL TRANSFORMATION OF A device.
2. MODAL TRANSFORMATION OF A type piezoelectricity thread transmission linear ultrasonic motor as claimed in claim 1 is characterized in that: described longitudinal vibration piezoelectric ceramic piece group is that the longitudinal vibration ring piezoelectric stacks or the annular longitudinal vibration potsherd of unidirectional polarization rearranges in order.
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| CN 201110120487 CN102185519B (en) | 2011-05-11 | 2011-05-11 | Mode conversion type piezoelectric thread transmission linear ultrasonic motor |
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| CN 201110120487 CN102185519B (en) | 2011-05-11 | 2011-05-11 | Mode conversion type piezoelectric thread transmission linear ultrasonic motor |
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| CN102185519B CN102185519B (en) | 2013-11-06 |
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| CN102355157A (en) * | 2011-10-10 | 2012-02-15 | 哈尔滨工业大学 | Piezoelectric plate-sandwiched rotary linear ultrasonic motor stator |
| CN102843065A (en) * | 2012-07-30 | 2012-12-26 | 南京航空航天大学 | Ultrasonic motor with rotating shaft position clearing function |
| CN102931874A (en) * | 2012-11-22 | 2013-02-13 | 上海交通大学 | Piezoelectric motor driven by longitudinal-torsional piezoelectric ceramic cylinder |
| CN103115056A (en) * | 2013-03-12 | 2013-05-22 | 哈尔滨工业大学 | Sandwich type nut which can be unlocked for changing operating mode of free beam longitudinal-torsional mode |
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| CN103115055A (en) * | 2013-03-12 | 2013-05-22 | 哈尔滨工业大学 | Paster type ultrasonic nut with self-locking and unlocking functions |
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| CN103521414A (en) * | 2013-11-25 | 2014-01-22 | 河南理工大学 | Oblique beam type longitudinal-torsional compound vibration switching device |
| CN106487273A (en) * | 2015-08-27 | 2017-03-08 | 中原大学 | Single-type hybrid, dual-hybrid piezoelectric motor and hybrid piezoelectric motor combination |
| CN106487273B (en) * | 2015-08-27 | 2019-02-15 | 中原大学 | Single-type hybrid, dual-hybrid piezoelectric motor and hybrid piezoelectric motor combination |
| CN105268620A (en) * | 2015-11-20 | 2016-01-27 | 哈尔滨工业大学 | Bi-directional longitrorse combined vibration device |
| CN105268620B (en) * | 2015-11-20 | 2018-09-11 | 哈尔滨工业大学 | A kind of two-way Hybrid transducer vibrating device |
| CN105478332A (en) * | 2015-11-20 | 2016-04-13 | 哈尔滨工业大学 | Longitudinal-torsional resonance ultrasonic vibration device |
| CN110753522A (en) * | 2017-01-17 | 2020-02-04 | 雷德利科学有限公司 | Torsional ultrasonic generator for orthopedic surgery |
| CN110753522B (en) * | 2017-01-17 | 2023-10-20 | 雷德利科学有限公司 | Torsional ultrasonic generator for orthopedic surgery |
| CN108448926A (en) * | 2017-12-08 | 2018-08-24 | 浙江师范大学 | A kind of two-freedom ultrasound electric machine and its driving method |
| CN108448926B (en) * | 2017-12-08 | 2020-04-10 | 浙江师范大学 | Two-degree-of-freedom ultrasonic motor and driving method thereof |
| CN112290824A (en) * | 2020-09-14 | 2021-01-29 | 南京航空航天大学 | Threaded piezoelectric linear actuator with high thrust and working method thereof |
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