CN204348762U - A kind of piezo-activator - Google Patents
A kind of piezo-activator Download PDFInfo
- Publication number
- CN204348762U CN204348762U CN201520043388.3U CN201520043388U CN204348762U CN 204348762 U CN204348762 U CN 204348762U CN 201520043388 U CN201520043388 U CN 201520043388U CN 204348762 U CN204348762 U CN 204348762U
- Authority
- CN
- China
- Prior art keywords
- piezoelectric patches
- sheet
- piezo
- activator
- constraint
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The utility model discloses a kind of piezo-activator, comprise long strip type piezoelectric patches, strip constraint sheet and driving power, it is characterized in that, two apparent surfaces that described piezoelectric patches is larger are respectively bonded with described in one along its length and retrain sheet, described piezoelectric patches and constraint sheet are consistent in the size in this face width direction, and retrain sheet in the longitudinal direction to piezoelectric patches and be applied with stretching prestressing force; Described piezoelectric patches polarizes along the length direction on this surface; With electrode on the apparent surface of two described in piezoelectric patches, electrode is connected with driving power by wire.This actuator is based on the strain of ferroelastic domain sell of one's property life, and structure is simple, and manufacture craft is simple; Super large actuation strain can be realized, even if without sandwich construction, also can realize larger actuating displacement.
Description
Technical field
The utility model belongs to precision actuation Element Technology field, particularly a kind of piezo-activator become based on ferroelastic domain.
Background technology
Piezo-activator, owing to having the features such as fast response time, control precision is high, output torque density is large, running noises is low, is widely used in the fields such as precision positioning, motor and vibration suppression.Simultaneously because piezo-activator performance is insensitive to size, in small size (millimeter ~ centimetre) scope, there is relatively high power density compared with traditional electromagnetic actuators, large actuating force, with the advantage such as relative high efficiency.
Piezo-activator mainly multi-layer piezoelectric actuator comparatively conventional at present.The advantage of multi-layer piezoelectric actuator is that driving voltage is low, and response is fast, exports actuation force larger; Shortcoming is actuation strain less (about 0.1%), and in order to realize larger actuating displacement, common approach is the number of plies increasing actuator.Increase the number of plies and not only make the complex manufacturing technology of actuator, and in manufacturing process, easily introduce defect due to multi-layer actuator, easily there is fracture failure in process in device, makes the reliability of device be difficult to ensure under arms.Therefore, be necessary to develop a kind of brand-new piezo-activator, even if realize also realizing larger actuating displacement without lamination (or lamination is less).
Utility model content
The purpose of this utility model is: for the drawback of multi-layer piezoelectric actuator, provides a kind of brand-new piezo-activator, even if realize also realizing larger actuating displacement without lamination (or lamination is less).
The purpose of this utility model is achieved in that a kind of piezo-activator, comprise long strip type piezoelectric patches, strip constraint sheet and driving power, it is characterized in that: be respectively bonded with described in one along its length on two apparent surfaces that described piezoelectric patches is larger and retrain sheet, described piezoelectric patches and constraint sheet are consistent in the size in this face width direction, and retrain sheet in the longitudinal direction to piezoelectric patches and be applied with stretching prestressing force; The polarised direction of described piezoelectric patches is the length direction on this surface; With electrode on the apparent surface of two described in piezoelectric patches, electrode is connected with driving power by wire.
In actuator of the present utility model, constraint sheet with piezoelectric piece bonding before, be subject to uniform compression at length direction, then piezoelectric patches both sides and constraint sheet are by compression bonded as one, the compression stress of finally release constraint sheet, thus be applied with stretching prestressing force along its length to piezoelectric patches.
In the technical scheme that the utility model relates to, described piezoelectric patches is not limited to specific material, can be piezoelectric ceramic or ferroelectric ceramic, can also be piezoelectric monocrystal or ferro-electricity single crystal.The principle of selection selects spontaneous strain large (spontaneous strain is greater than 0.35%) as much as possible, the ferroelectric material that coercive field is less.
In the technical scheme that the utility model relates to, described constraint sheet can sheet metal, can also be the good nonmetallic slices of other elasticity.The principle of selection is elasticity better (is namely out of shape and do not surrender within the scope of piezoelectric patches spontaneous strain, still retention wire elasticity), and modulus of elasticity is appropriate.
Further, actuator of the present utility model can be the single layer structure comprising a piezoelectric patches and two constraint sheets; Also can be the sandwich construction of n block piezoelectric patches and n+1 block constraint sheet composition, wherein alternately, n be natural number, n >=2 for piezoelectric patches and constraint sheet; Also can be the laminated construction of n block piezoelectric patches (n is natural number, n >=2) and 2 pieces of constraint sheet compositions, namely piezoelectric patches be stacked in the longitudinal direction, and retrains sheet and just lengthen in the longitudinal direction; Can also be the mixed structure of above-mentioned sandwich construction and piezoelectric patches laminated construction, there is polylith piezoelectric patches and polylith constraint sheet, between every two pieces of constraint sheets, there is polylith piezoelectric patches stacked in the longitudinal direction.
The preparation method of the utility model piezo-activator comprises: on two apparent surfaces that strip piezoelectric patches is larger, make electrode, and polarized along its length by piezoelectric patches; Uniform compression is applied along its length to strip constraint sheet; Then bond on two larger apparent surfaces of piezoelectric patches by the constraint sheet applying compression, after bonding, release is applied to the compression on constraint sheet.After assembling, piezoelectric patches can be subject to the stretching prestressing force of a polarised direction.
The utility model has the advantage of: it provide a kind of new actuator structure, and the piezo-activator that actuation mechanism is different with traditional.Traditional piezo-activator based on be the piezoelectric effect of material, and the utility model based on be the raw strain of the ferroelastic domain sell of one's property.The prestressed structure of the utility model design can realize electric field easily and remove, and the self-healing function of electricdomain, so have the feature of passive self-locking.The utility model, compared with traditional actuator, has the following advantages: structure is relatively simple, and manufacture craft is relatively simple; According to the difference that piezoelectric element material is chosen, the super large actuation strain up to 0.17% ~ 1.15% can be realized in theory, at least the actuation strain of conventional piezoelectric actuator can be improved more than 70%; Due to the utility model employing is that length direction activates, even if so without sandwich construction, also can realize larger actuating displacement; Because the utility model structure is simple, containing less original paper, so easily miniaturized, cost is also relatively low.
Accompanying drawing explanation
Fig. 1 is the structural representation of one of the utility model embodiment single layer structure actuator.
Fig. 2 is the assembling process schematic diagram of actuator shown in Fig. 1.
Fig. 3 a, Fig. 3 b and Fig. 3 c show the operation principle of the utility model actuator.
Fig. 4 is the general structure schematic diagram of two sandwich construction actuators of the utility model embodiment.
Fig. 5 is the general structure schematic diagram of the triple stack layers structure actuator of the utility model embodiment.
Fig. 6 is the general structure schematic diagram of four multi-layer laminate structure actuators of the utility model embodiment.
In figure: 21a, 21b, 21c, 21d, 21e-retrain sheet; 22,22a, 22b, 22c, 22d, 22e, 22f, 22g, 22h-piezoelectric element sheet; The wire that 50-is connected with voltage source; P-electric polarization; The initial length of L-actuator; The displacement of Δ L-actuator; E-electric field.
Embodiment
Accompanying drawing discloses section Example of the present utility model without limitation, and below in conjunction with accompanying drawing, by specific embodiment, the utility model is further described, but limits scope of the present utility model never in any form.
As seen from Figure 1: shown actuator is made up of compressing tablet element 22 and two pieces of constraint sheet 21a and 21b.Wherein piezoelectric patches 22 polarizes along its length, and in figure, P represents electric polarization, and arrow represents polarised direction.The apparent surface that two of piezoelectric patches 22 are larger is electrode surface, and in figure, thick black line represents electrode, and electrode is connected with driving voltage source by wire 50.Fig. 2 illustrates the assembling process of actuator shown in Fig. 1.First constraint sheet 21a and 21b is applied uniform compression stress ot along its length, then piezoelectric patches 22 epoxy resin and constraint sheet 21a and 21b are bonded together by mode as shown in Figure 2, solidify well Deng epoxy resin, release is applied to the compression on constraint sheet 21a and 21b.After assembling, piezoelectric patches 22 can be subject to the stretching prestressing force of a polarised direction.
Fig. 3 a to Fig. 3 c illustrates the operation principle of actuator shown in Fig. 1.When the voltage of a proper operation frequency is applied to piezoelectric patches 22 by wire 50, voltage increase process in, when electric field exceedes the coercive electric field of material, electricdomain can occur upset and along direction of an electric field orientation.Due to electricdomain upset, material can shorten Δ L along initial polarization direction, and in Fig. 3 b, dotted line represents the size before actuators deform.We suppose the switching strain S caused
rrepresent, the strain of the actual generation of actuator is S
x, the modulus of piezoelectric ceramic piece is Y
p, the modulus of constraint sheet is Y
c, the stretching coercive stress of piezoelectric patches is σ
c, the prestressing force applied to piezoelectric patches in assembling process is σ
pre.Then in switching process, actuator should meet compatibility of deformation in x direction, the condition of interfacial stress balance, therefore has
(S
x-S
r)Y
p+2S
xY
c＝0 (1)
After electric field is unloaded to zero, gets back to initial condition under the tension stress that electricdomain can produce at constraint sheet and prestressed acting in conjunction, have
-2S
xY
c+σ
pre＝σ
c(2)
Can be obtained by (1) formula and (2)
S
x＝S
r+(σ
c-σ
pre)/Y
p(3)
It may be noted that the elongation owing to specifying in Fig. 3 a to Fig. 3 c is positive direction, so S in above formula
xand S
rbe negative.We are for typical ferroelectric ceramic PIC151, its domain switching strain S
r=-0.2%, modulus of elasticity Y
p=100GPa, piezoelectric modulus 500pm/V, stretching coercive stress gets σ
c≈ 40MPa, supposes the prestressing force σ applied
pre=10MPa, then by (3) Shi Ke get, actuation strain is
|S
x|≈0.17％ (4)
And tradition is about 0.1% based on the actuator actuation strain of piezoelectric effect, actuation strain is improve 70% by the utility model.According to the PMN-PT monocrystalline of Tetragonal, its domain switching strain S
r=-1.28%, modulus of elasticity Y
p=12GPa, stretching coercive stress gets σ
c≈ 20MPa, suppose apply stress σ
pre=5MPa, then by (3) Shi Ke get, actuation strain is
|S
x|≈1.15％ (5)
Even the monocrystalline that existing piezoelectric property is best, produce the strain of 0.2% based on the most multipotency of piezoelectric effect, actuation strain is improve 475% by the utility model.Therefore when driving voltage adopts unidirectional sine | V
0sin ω t| waveform.Actuator just there will be the vibration of high frequency, thus realizes the function of actuating.
Fig. 4 is the general structure schematic diagram of another kind of execution mode of the present utility model.It and difference embodiment illustrated in fig. 1 are: have employed sandwich construction.Shown in Fig. 4 is 4 Rotating fields, can expand as required as n layer (n >=2) in reality.The same with shown by Fig. 2 and Fig. 3 a ~ 3c of its assembling mode and operation principle.The distinguishing feature of this embodiment is that the thrust of actuator is larger, and driving voltage is lower.
Fig. 5 is the general structure schematic diagram of another execution mode of the present utility model.The difference of it and above-described embodiment is to have employed laminated construction at length direction, but lamination is piezoelectric element 22, and constraint sheet is extended length.Shown in Fig. 5 is 2 Rotating fields, can expand as required as n layer (n >=2) in reality.The same with shown by Fig. 2 and Fig. 3 a ~ 3c of its assembling mode and operation principle.The distinguishing feature of the present embodiment realizes larger actuating displacement under comparatively compact structure.
Fig. 6 is the general structure schematic diagram of another execution mode of the present utility model.The difference of it and above embodiment is all to have employed sandwich construction in length and horizontal both direction.The lamination number in each direction can adjust as required.The same with shown by Fig. 2 and Fig. 3 a ~ 3c of its assembling mode and operation principle.The distinguishing feature of the present embodiment is that actuating displacement and actuation force are all larger.
Claims (8)
1. a piezo-activator, comprise long strip type piezoelectric patches, strip constraint sheet and driving power, it is characterized in that, two apparent surfaces that described piezoelectric patches is larger are respectively bonded with described in one along its length and retrain sheet, described piezoelectric patches and constraint sheet are consistent in the size in this face width direction, and retrain sheet in the longitudinal direction to piezoelectric patches and be applied with stretching prestressing force; The polarised direction of described piezoelectric patches is the length direction on this surface; With electrode on the apparent surface of two described in piezoelectric patches, electrode is connected with driving power by wire.
2. piezo-activator as claimed in claim 1, it is characterized in that, described piezoelectric patches is piezoelectric ceramic or ferroelectric ceramic, or piezoelectric monocrystal or ferro-electricity single crystal.
3. piezo-activator as claimed in claim 1, it is characterized in that, described piezoelectric patches is the ferroelectric material piezoelectric patches that spontaneous strain is greater than 0.35%.
4. piezo-activator as claimed in claim 1, it is characterized in that, described constraint sheet is sheet metal or nonmetallic slices.
5. piezo-activator as claimed in claim 1, is characterized in that, described actuator is the single layer structure comprising a piezoelectric patches and two constraint sheets.
6. piezo-activator as claimed in claim 1, is characterized in that, described actuator retrains by n block piezoelectric patches and n+1 block the sandwich construction that sheet form, wherein piezoelectric patches and retrain sheet alternately, n be more than or equal to 2 natural number.
7. piezo-activator as claimed in claim 1, is characterized in that, described actuator is the laminated construction of n block piezoelectric patches and 2 pieces of constraint sheet compositions, and the n block piezoelectric patches be clipped between 2 pieces of constraint sheets are stacked in the longitudinal direction, wherein n be more than or equal to 2 natural number.
8. piezo-activator as claimed in claim 1, is characterized in that, described actuator comprises polylith piezoelectric patches and polylith constraint sheet, has polylith piezoelectric patches stacked in the longitudinal direction between every two pieces of constraint sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520043388.3U CN204348762U (en) | 2015-01-22 | 2015-01-22 | A kind of piezo-activator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520043388.3U CN204348762U (en) | 2015-01-22 | 2015-01-22 | A kind of piezo-activator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204348762U true CN204348762U (en) | 2015-05-20 |
Family
ID=53232013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520043388.3U Expired - Fee Related CN204348762U (en) | 2015-01-22 | 2015-01-22 | A kind of piezo-activator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204348762U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538545A (en) * | 2015-01-22 | 2015-04-22 | 北京大学 | Ferroelastic domain switching based large actuating strain piezoelectric actuator |
| CN106684239A (en) * | 2017-01-09 | 2017-05-17 | 武汉大学 | Extension type laminated piezoelectric actuator |
-
2015
- 2015-01-22 CN CN201520043388.3U patent/CN204348762U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104538545A (en) * | 2015-01-22 | 2015-04-22 | 北京大学 | Ferroelastic domain switching based large actuating strain piezoelectric actuator |
| CN104538545B (en) * | 2015-01-22 | 2017-02-22 | 北京大学 | Ferroelastic domain switching based large actuating strain piezoelectric actuator |
| CN106684239A (en) * | 2017-01-09 | 2017-05-17 | 武汉大学 | Extension type laminated piezoelectric actuator |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104821372A (en) | Shearing-type piezoelectric composite material | |
| CN103943772B (en) | Monolithic piezoelectric transducer and preparation method thereof | |
| CN204348762U (en) | A kind of piezo-activator | |
| CN106505147B (en) | Miniature, flexible magnetic electric compound material of one kind and preparation method thereof | |
| CN109429534A (en) | Generator and its manufacturing method including magnetoelastic transducer | |
| CN206259386U (en) | A kind of miniature, flexible magnetic electric compound material | |
| CN1755962A (en) | Nickel/piezoelectric ceramic laminar composite material with magnetoelectric effect and preparation process thereof | |
| CN103066201A (en) | Method multi-field coupling preparation magnetoelectric composite | |
| CN104538545A (en) | Ferroelastic domain switching based large actuating strain piezoelectric actuator | |
| CN107565013B (en) | Longitudinal gradient short fiber piezoelectric composite material and preparation method thereof | |
| CN101378106A (en) | Laminated shear piezoelectric ceramic actuator | |
| CN102034926B (en) | Magnetoelectric laminated material structure formed by connecting piezoelectric material layers in series | |
| CN104124891A (en) | Piezoelectric vibrator and precise displacement platform comprising same | |
| US20140001923A1 (en) | Composite polarization type piezoelectric actuator | |
| CN204068758U (en) | Piezoelectric vibrator and comprise the precision displacement platform of this piezoelectric vibrator | |
| CN107527992B (en) | Bidirectional gradient short fiber piezoelectric composite material and preparation method thereof | |
| CN2899119Y (en) | Aluminum-based laminated high-voltage overloading electric driver | |
| CN204538087U (en) | The piezoelectric bimorph of hole connection substrate electrode | |
| CN104467517B (en) | Piezoelectric composite pipe driving device and manufacturing method for piezoelectric composite pipe driving device | |
| CN107070297A (en) | Laminated type flexure type piezoelectric ceramic actuator | |
| CN109671842A (en) | A kind of bending Piezoelectric Driving film | |
| CN102664233A (en) | Piezoelectric driver and manufacturing method thereof | |
| CN206441768U (en) | Tension type stacked piezoelectric actuator | |
| CN101572504B (en) | Myoid piezoelectric fiber composite material driver | |
| CN201323208Y (en) | Laminated shear piezoelectric ceramic actuator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20180122 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |