CN105141174A - Patch type stationary wave rotary-type piezoelectric actuator - Google Patents
Patch type stationary wave rotary-type piezoelectric actuator Download PDFInfo
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- CN105141174A CN105141174A CN201510563105.2A CN201510563105A CN105141174A CN 105141174 A CN105141174 A CN 105141174A CN 201510563105 A CN201510563105 A CN 201510563105A CN 105141174 A CN105141174 A CN 105141174A
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- cylindrical roller
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Abstract
The invention discloses a patch type stationary wave rotary-type piezoelectric actuator, which is constituted of a cylinder roll shaft, fixing devices and two stator components of identical shapes with relative positions staggered; each of the stator components comprises a piezoelectric ceramic sheet and a rectangular plate; the piezoelectric ceramic sheet is set on the surface of the rectangular plate; the cylinder roll shaft is set between the two stator components, wherein the piezoelectric ceramic sheet is used for receiving longitudinal vibration modes of 2n+1 generated by electrical signal excitation stator components; and the fixing devices are set on vibration pitch surfaces on upper and lower surfaces of the upper and lower stator components. When the upper and lower components are respectively used to apply electrical signals with phi / 2 phase difference, the cylinder roll shaft working under the longitudinal vibration modes is excited and driven to rotate through the friction action. If the two-phase electric signals are simultaneously at contrary directions, the cylinder roll shaft will be rotated reversely. The actuator provided herein has the advantages of simple and compact structure, easy processing and assembly and microminiaturization; and the problem of consistent frequency is solved.
Description
Technical field
The present invention relates to a kind of piezoelectric actuator, particularly relate to a kind of SMD standing-wave rotation type piezoelectric actuator, belong to Precision Piezoelectric actuation technology field.
Background technology
Piezoelectric actuator is the inverse piezoelectric effect utilizing piezoelectric, and excite elastomer to produce micro breadth oscillation, and be converted into the gyration of rotor by the friction between stator and rotor, driving load, is a kind of miniature actuator of novel concept.Current piezoelectric actuator mainly with piezoelectric ultrasonic motor, piezoelectricity fold stack driver etc. for representative, and piezoelectric ultrasonic motor is as the resonant piezoelectric actuator of one, apply in fields such as Aero-Space, weapon, biomedicine, optics, robots and industrialization.Most piezoelectric ultrasonic motor is all adopt the principle of two-phase modal coupling to carry out work, namely stator system adopts longitudinal bending mode coupling or longitrorse modal coupling or winding modal coupling or bending modal coupling, and the most typically standing wave linear/rotating piezoelectric ultrasound electric machine, can larger speed and thrust be exported when two-phase mode is consistent, receive the favor of researcher in recent years.Although two-phase modal coupling type piezoelectric ultrasonic motor has many advantages, also there is fatal defects in this kind of actuator, is exactly that two-phase model frequency consistency problem cannot solve all the time.Even if the difference on the frequency of two-phase mode can be reduced to greatest extent by simulation calculation size of optimizing structure, but two-phase model frequency cannot be made completely consistent, and due to process and assemble error, two-phase operation mode is caused to there is certain difference all the time, therefore the drive control part of actuator becomes complicated, and performance is also had a greatly reduced quality simultaneously.In order to solve the problem of piezoelectric actuator frequency invariance, the present invention proposes a kind of SMD standing-wave rotation type piezoelectric actuator, have employed the stator module of two similar shapes, utilize two-phase longitudinal vibration mode to there is pi/2 phase difference over time and space to rotate to drive cylindrical roller, solve the problem that two-phase model frequency is inconsistent, have structure simple, compact, be easy to process, assembling and the feature of microminiaturization.
Summary of the invention
Technical problem to be solved by this invention proposes a kind of SMD standing-wave rotation type piezoelectric actuator for the deficiency of background technology, which solve the inconsistent problem of two-phase model frequency that conventional piezoelectric actuator exists, have structure simple, compact, be easy to process, the feature of assembling and microminaturization.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of SMD standing-wave rotation type piezoelectric actuator, comprise the similar shape stator module that cylindrical roller 4 and two relative positions stagger, described stator module comprises piezoelectric ceramic piece 2 and rectangular slab 3, described piezoelectric ceramic piece 2 is arranged on the surface of rectangular slab 3, and described cylindrical roller 4 is arranged between two stator modules; Wherein, described piezoelectric ceramic piece 2 produces 2n+1 rank longitudinal vibration mode for receiving signal of telecommunication excitation stator module, wherein, and n >=1 and n is integer.
As the further preferred version of a kind of SMD standing-wave rotation type piezoelectric actuator of the present invention, described stator module is also provided with multiple fixture 1, and being evenly distributed on the nodel line position of stator module extensional vibration, described fixture 1 is for fixing and between adjustment two stator modules and cylindrical roller 4 contact.
As the further preferred version of a kind of SMD standing-wave rotation type piezoelectric actuator of the present invention, described piezoelectric ceramic piece 2 is pasted onto rectangular slab 3 surface relative with cylindrical roller 4 contact-making surface, and is positioned at the nodal section place of the longitudinal vibration mode of rectangular slab 3.
As the further preferred version of a kind of SMD standing-wave rotation type piezoelectric actuator of the present invention, with two stator modules of cylindrical roller 4 contact position on be also provided with V-type groove 3.4 for fixed cylinder roller bearing 4.
As the further preferred version of a kind of SMD standing-wave rotation type piezoelectric actuator of the present invention, described piezoelectric ceramic piece 2 is rectangular piezoelectric ceramic sheet, and polarizes along its length.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
The present invention proposes a kind of SMD standing-wave rotation type piezoelectric actuator, have employed the stator module of two similar shapes, utilize the consistency feature of its structure and vibration characteristics, solve the inconsistent problem of two-phase model frequency that the single stator module of conventional piezoelectric actuator exists, have structure simple, compact, be easy to process, the feature of assembling and microminaturization.
Accompanying drawing explanation
Fig. 1 is the structural representation of the SMD rotating piezoelectric actuator of the present invention;
Fig. 2 is the structure diagram of the SMD rotating piezoelectric actuator of the present invention;
Fig. 3 is that detail view is installed in the local of the present invention's SMD rotating piezoelectric actuator cylindrical roller;
Working state schematic representation when Fig. 4 is the present invention SMD rotating piezoelectric actuator t=0;
Working state schematic representation when Fig. 5 is the present invention SMD rotating piezoelectric actuator t=1/4T;
Working state schematic representation when Fig. 6 is the present invention SMD rotating piezoelectric actuator t=1/2T;
Working state schematic representation when Fig. 7 is the present invention SMD rotating piezoelectric actuator t=3/4T;
Fig. 8 is the cyclic variation curve of the variable precompression of the present invention;
Fig. 9 is the cyclic variation curve of the variable Friction thrust of the present invention.
Wherein: 1-fixture, 2-piezoelectric ceramic piece, 3-rectangular block, 4-cylindrical roller, the nodel line of 3.1-stator module extensional vibration, the crest of 3.2-stator module extensional vibration, the trough of 3.3-stator module extensional vibration, 3.4-V type groove.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, the present invention proposes a kind of SMD standing-wave rotation type piezoelectric actuator, a kind of SMD standing-wave rotation type piezoelectric actuator, comprise the similar shape stator module that cylindrical roller (4) and two relative positions stagger, described stator module comprises piezoelectric ceramic piece (2) and rectangular slab (3), described piezoelectric ceramic piece (2) is arranged on the surface of rectangular slab (3), and described cylindrical roller (4) is arranged between two stator modules, wherein, described piezoelectric ceramic piece (2) produces 2n+1 rank longitudinal vibration mode for receiving signal of telecommunication excitation stator module, n >=1, n is integer, described stator module is also provided with multiple fixture (1), and be evenly distributed on the nodel line position of stator module extensional vibration, described fixture (1) is for fixing and between adjustment two stator modules and cylindrical roller (4) contact, described piezoelectric ceramic piece (2) is pasted onto rectangular slab (3) surface relative with cylindrical roller (4) contact-making surface, and be positioned at the nodal section place of the longitudinal vibration mode of rectangular slab (3), with two stator modules of cylindrical roller (4) contact position on be also provided with V-type groove (3.4) for fixed cylinder roller bearing (4), described piezoelectric ceramic piece (2) is rectangular piezoelectric ceramic sheet, and polarize along its length.
The present invention proposes a kind of SMD standing-wave rotation type piezoelectric actuator, have employed the stator module of two similar shapes, utilize the consistency feature of its structure and vibration characteristics, solve the inconsistent problem of two-phase model frequency that the single stator module of conventional piezoelectric actuator exists, have structure simple, compact, be easy to process, the feature of assembling and microminaturization.
The structure diagram of SMD rotating piezoelectric actuator as shown in Figure 2, two similar shape stator modules have identical structure and vibration characteristics, wherein piezoelectric ceramic piece alongst upper polarization, and being pasted onto the rectangular slab surface relative with cylindrical roller contact-making surface, its paste position is the nodal section place of stator module extensional vibration.
Detail view is installed as shown in Figure 3 in the local of cylindrical roller, and the particular location of cylindrical roller is positioned at the nodal section place of stator module extensional vibration and the crest (3.2) of lower stator module extensional vibration or trough place (3.3); Meanwhile, in order to make cylindrical roller be fixed on above-mentioned position, V-type groove is provided with in the position that upper and lower stator module contacts with cylindrical roller.
Stator module is made up of piezoelectric ceramic piece and rectangular slab, wherein piezoelectric ceramic piece is arranged on the surface of rectangular slab, cylindrical roller is arranged between two stator modules, rectangular slab can be designed to rectangular beam or cylindrical bar according to application, same piezoelectric ceramic piece redesigns according to the structural change of rectangular slab, and two similar shape stator modules have identical structure and vibration characteristics.
Can inspire 2n+1(n >=1 of stator module after piezoelectric ceramic piece is applied in the signal of telecommunication, n is positive integer) rank longitudinal vibration mode.The stator module of described two similar shapes is separately positioned on the lower regions of cylindrical roller, be respectively stator module and lower stator module, wherein upper and lower stator module produces 2n+1(n >=1 respectively under the excitation of sinusoidal voltage or cosinusoidal voltage, and n is positive integer) rank longitudinal vibration mode.Described cylindrical roller is arranged on the centre of two stator modules, and stagger in the position of two stator modules, particular location is positioned at the nodal section place of stator module extensional vibration and the crest of lower stator module extensional vibration or trough place, simultaneously, in order to make cylindrical roller be fixed on above-mentioned position, be provided with V-type groove in the position that two stator modules contact with cylindrical roller.Described fixture is placed on the nodal section position of stator module, and is uniformly distributed on nodel line position, for fixing and regulating the contact between upper and lower stator module and cylindrical roller.Described cylindrical roller contacts with the extensional vibration nodal section position of upper stator module all the time, and alternately contact with the extensional vibration crest of lower stator module or wave trough position, wherein alternately contact with the extensional vibration crest of upper stator module or wave trough position, wherein contact with the extensional vibration nodal section position of upper stator module, be subject to stator module and be applied to cylindrical roller variable Friction thrust tangentially, and during with the extensional vibration trough of lower stator module or crest location periodic contact, be subject to the variable precompression that lower stator module is applied to normal direction on cylindrical roller, and variable Friction thrust changes along with the change of variable precompression, along with variable precompression periodically changes, cylindrical roller is subject to variable Friction thrust and drives continuous rotation.
By applying the signal of telecommunication with pi/2 phase difference respectively to the piezoelectric ceramic piece on two stator modules, excitation stator module produces the extensional vibration of 2n+1 rank; Described cylindrical roller be arranged on stator module vibration nodal section place and lower stator module vibration crest or trough place, thus by rubbing action drive cylindrical roller rotate; Described fixture is arranged on the nodal plane place on upper and lower stator module upper and lower surface separately.If oppositely, cylindrical roller will reverse rotation simultaneously for the two-phase signal of telecommunication.This motor have structure simple, compact, be easy to processing, assembling and the advantage such as microminaturization, and solve frequency invariance problem.
When the piezoelectric ceramic piece being arranged on upper and lower stator module surface being applied to have the phase difference signal of telecommunication of pi/2 after simultaneously, inspire the 2n+1 rank longitudinal vibration mode of stator module, rotated by frictional force drives cylindrical roller.The concrete course of work is as follows, and when t=0, actuator is in initial condition, and stator module is in equilbrium position, and cylindrical roller keeps static, as shown in Figure 4.Through 1/4 all after date, namely as t=1/4T, upper and lower stator module produces identical distortion due to the excitation of piezoelectric ceramic piece, and now stator module produces 2n+1 longitudinal vibration mode, and is in first 1/4 cycle of mode of oscillation, as shown in Figure 5.Because cylindrical roller is arranged on the extensional vibration nodal section place of upper stator module, therefore go up stator module and be applied with a variable tangent direction friction thrust FT all the time on cylindrical roller, and the region that cylindrical roller contacts with lower stator module is positioned at the crest place of lower stator module extensional vibration, therefore cylindrical roller receives the variable precompression F of normal direction that lower stator module applies
z, the now tangent direction friction thrust F that is subject to of cylindrical roller
t1with normal direction precompression F
z1be in maximum, simultaneously tangential variable Friction thrust changes along with the change of the variable precompression of normal direction, and as in figs. 8 or 9, the mechanical periodicity curve of variable precompression and variable frictional force is as figure: from 0 to 1/4T time, the variable precompression of normal direction increases F from 0
z1, and tangential variable Friction thrust is increased to F along with the increase of normal direction precompression
t1.In this course, due to the effect of tangential variable Friction thrust, cylindrical roller starts to rotate, and rotating speed is increased to V from 0
1.Again through 1/4 all after date, namely as t=1/2T, stator module is returned to original equilbrium position, namely upper and lower stator module is applied to tangential variable Friction thrust on cylindrical roller and the variable precompression of normal direction is all 0, and cylindrical roller is in maximal rate rotating speed, because continuation rotates by effect of inertia, as shown in Figure 6.In second 1/4 cycle, upper and lower stator module is applied to tangential variable Friction thrust on cylindrical roller and the variable precompression of normal direction all reduces to 0 gradually from maximum, and the rotating speed of cylindrical roller is constantly increased to maximum V
2.As t=3/4T, the distortion of stator module recovers again, be that crest location becomes wave trough position, and wave trough position becomes crest location, but nodal section position does not change all the time, as shown in Figure 7 with the difference in t=3/4T moment.Therefore, cylindrical roller is in the nodal section position of stator module extensional vibration and the wave trough position of lower stator module extensional vibration, and this normal direction precompression that stator module is applied to cylindrical roller is at present F
z2, be the maximum normal direction precompression in lower half period, but be less than the maximum normal direction precompression F of half period
z1, and the tangent direction friction thrust that upper stator module is applied to cylindrical roller is F
t2, be equally also tangent direction friction thrust maximum in lower half period, but absolute value is less than the maximum tangent direction friction thrust F of half period
t1, F simultaneously
z1and F
z2direction is identical, F
t1and F
t2direction contrary.In the 3rd 1/4 cycle, upper and lower stator module is applied to tangential variable Friction thrust on cylindrical roller and the variable precompression of normal direction, and to be all increased in lower half period gradually from 0 maximum, and the rotating speed of cylindrical roller is due to tangent direction friction thrust and direction of rotation, be therefore constantly decreased to V
3.As t=T, the vibration of stator module is in equilbrium position again, namely upper and lower stator module is applied to tangential variable Friction thrust on cylindrical roller and the variable precompression of normal direction is all 0, and cylindrical roller is in low speed rotation process, because continuation rotates by effect of inertia.In the 4th 1/4 cycle, upper and lower stator module is applied to tangential variable Friction thrust on cylindrical roller and the variable precompression of normal direction all reduces to 0 gradually from the maximum of lower half period, the inhibition of tangent direction friction thrust to cylindrical roller is reduced to 0 gradually simultaneously, and the rotating speed of cylindrical roller is also in continuous reduction.When the excitation of next cycle continues, upper and lower stator module will repeat the mode of vibration of upper one-period, and the motion mode according to upper one-period continues to rotate by cylindrical roller, and therefore under the excitation of the two-phase signal of telecommunication, cylindrical roller achieves continuous rotation.If change the direction of the two-phase signal of telecommunication simultaneously, the direction of rotation of cylindrical roller will oppositely.
According to working method and the structural design of stator module, and the layout of cylindrical roller, can find out that the mode of oscillation of upper and lower stator module is consistent, achieve and drive cylindrical roller to carry out continuous rotation motion.Therefore the present invention just ensure that the consistency of the operating frequency of stator module part in principle.In actual application, as long as ensure the consistency of technique, just can solve the two-phase frequency invariance problem that conventional piezoelectric actuator exists completely.For SMD standing-wave rotation type piezoelectric actuator proposed by the invention, its stator module not only can be operated in longitudinal vibration mode, also can be operated in flexural vibration mode to realize the rotary motion of cylindrical roller, its mechanism is consistent with longitudinal vibration mode simultaneously.
Those skilled in the art of the present technique are understandable that, unless otherwise defined, all terms used herein (comprising technical term and scientific terminology) have the meaning identical with the general understanding of the those of ordinary skill in field belonging to the present invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.By reference to the accompanying drawings embodiments of the present invention are explained in detail above, but the present invention is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, makes a variety of changes under can also or else departing from the prerequisite of present inventive concept.
Claims (5)
1. a SMD standing-wave rotation type piezoelectric actuator, it is characterized in that: comprise the similar shape stator module that cylindrical roller (4) and two relative positions stagger, described stator module comprises piezoelectric ceramic piece (2) and rectangular slab (3), described piezoelectric ceramic piece (2) is arranged on the surface of rectangular slab (3), and described cylindrical roller (4) is arranged between two stator modules; Wherein, described piezoelectric ceramic piece (2) produces 2n+1 rank longitudinal vibration mode for receiving signal of telecommunication excitation stator module, wherein, and n >=1 and n is integer.
2. one according to claim 1 SMD standing-wave rotation type piezoelectric actuator, it is characterized in that: on described stator module, be also provided with multiple fixture (1), and being evenly distributed on the nodel line position of stator module extensional vibration, described fixture (1) is for the fixing and contacts of adjustment two between stator module and cylindrical roller.
3. one according to claim 1 SMD standing-wave rotation type piezoelectric actuator, it is characterized in that: described piezoelectric ceramic piece (2) is pasted onto rectangular slab (3) surface relative with cylindrical roller (4) contact-making surface, and is positioned at the nodal section place of the longitudinal vibration mode of rectangular slab (3).
4. one according to claim 1 SMD standing-wave rotation type piezoelectric actuator, is characterized in that: with two stator modules of cylindrical roller (4) contact position on be also provided with V-type groove (3.4) for fixed cylinder roller bearing (4).
5. one according to claim 1 SMD standing-wave rotation type piezoelectric actuator, is characterized in that: described piezoelectric ceramic piece (2) is rectangular piezoelectric ceramic sheet, and polarizes along its length.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109378993A (en) * | 2018-11-14 | 2019-02-22 | 南京航空航天大学 | A kind of double cropping moves head patch type piezoelectric oscillator and its working method |
| CN110048637A (en) * | 2018-11-21 | 2019-07-23 | 南京航空航天大学 | A kind of single mode rotating piezoelectric actuator |
| CN110299867A (en) * | 2019-07-16 | 2019-10-01 | 太原科技大学 | A kind of four-footed driving rotary ultrasonic wave motor |
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| CN109378993A (en) * | 2018-11-14 | 2019-02-22 | 南京航空航天大学 | A kind of double cropping moves head patch type piezoelectric oscillator and its working method |
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| CN110299867A (en) * | 2019-07-16 | 2019-10-01 | 太原科技大学 | A kind of four-footed driving rotary ultrasonic wave motor |
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