CN107359810A - A kind of ultralow frequency piezoelectric vibratory energy harvester - Google Patents
A kind of ultralow frequency piezoelectric vibratory energy harvester Download PDFInfo
- Publication number
- CN107359810A CN107359810A CN201710727216.1A CN201710727216A CN107359810A CN 107359810 A CN107359810 A CN 107359810A CN 201710727216 A CN201710727216 A CN 201710727216A CN 107359810 A CN107359810 A CN 107359810A
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- driver
- transducer
- transducers
- circular arc
- rotating shaft
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- 230000001815 facial effect Effects 0.000 claims abstract description 17
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 16
- 238000009434 installation Methods 0.000 claims abstract description 11
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 238000010276 construction Methods 0.000 abstract description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002305 electric material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
- H02N2/183—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators using impacting bodies
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The present invention relates to a kind of ultralow frequency piezoelectric vibratory energy harvester, belongs to field of piezoelectric generation.Framework is provided with left and right and front-rear side walls, and two transducers are housed on the boss of left side wall, dividing plate is crimped between transducer fixing end, the substrate of two transducers is close to installation；The pin-and-hole of driver is enclosed in rotating shaft, and rotating shaft both ends are on front-rear side walls；The outer surface of driver is made up of two face profiles and two circular arc facial contours；The free end of two transducers is acted against on face profile, its right end face of two transducers and the center co-planar of rotating shaft；Reed is inserted with the elongated slot on circular arc facial contour on the right side of driver, the other end of reed is equipped with frequency modulation mass on the boss of right side wall on reed；It is flat construction before transducer is installed and after installation and when extraneous without friction, the corner of driver around the shaft increases to transducer deflection when making transducer and tangent circular arc facial contour on driver and reaches maximum, and now the maximum crushing stress on piezoelectric film is less than its allowable value.
Description
Technical field
The invention belongs to piezo-electric generating and technical field of energy recovery, and in particular to energy is captureed in a kind of ultralow frequency piezoelectric vibration
Device.
Background technology
Environmental energy generating is collected using piezoelectric direct piezoelectric effect, the research of construction microminiature energy accumulator turns into state
Inside and outside focus, it is remote sensing, heeling-in monitoring system and the power supply of portable micropower electronic product the purpose is to substituting battery.
At present, the environmental energy that can be effectively reclaimed using piezoelectric up to more than 10 is planted, wherein studying more has：Ambient vibration energy,
The rotation function of lathe, vehicle, engine and generator shaft and bearing etc., the limbs of people and organ movement can, wave, wind,
The fluid energy such as river.Although differences such as the structure of the piezoelectric harvester proposed for above-mentioned all kinds of energy, principle, features,
It is substantially what is generated electricity using transducer compound bending deformation, piezoelectric film bears alternate drawing-action of compressive stress in work；Because crisp
Property piezoelectric is pressure-resistant intolerant to drawing, and its allowable tensile stress is far below permissible compression stress, and piezoelectric film is easily because tension is excessive in work
And damage, therefore reliability is low；Realized in addition, existing piezoelectric harvester is substantially using the inertia force of additional mass on transducer
What flexural deformation generated electricity, driving frequency close to amplitude during its fundamental frequency is larger, other frequencies when amplitude very little, be easily caused ultralow frequency-
Generating capacity is poor when under large amplitude environment because of the excessive damage of deflection, other frequencies or does not generate electricity.Therefore to obtain piezoelectric harvester
With popularization and application, need solve the problems such as its reliability and effective bandwidth first.
The content of the invention
The present invention proposes a kind of ultralow frequency piezoelectric vibratory energy harvester, and the embodiment that the present invention uses is：Framework is provided with a left side
Right side wall and front-rear side walls, two transducers, the fixation of two transducers are installed through screw and pressing plate on the boss of left side wall
Dividing plate is crimped between end；Transducer is formed by substrate and piezoelectric film bonding, and the substrate of two transducers is close to installation；Driver
Pin-and-hole be enclosed in rotating shaft, rotating shaft both ends are separately mounted on front side wall and rear wall；The outer surface of driver is by two planes
Profile and two circular arc facial contours are formed, and two face profiles are parallel to each other and centre distance away from rotating shaft is equal, two circular arcs
The radius of facial contour is equal and the center of circle is identical；The free end of two transducers is acted against on face profile, the right side of two transducers
Side end face and the center co-planar of rotating shaft；Reed is inserted with the elongated slot on circular arc facial contour on the right side of driver and is consolidated through screw
Fixed, the other end of reed is arranged on the boss of right side wall through screw and pressing plate, and frequency modulation mass is provided with through screw on reed.
It is flat construction before transducer installation and after installation and when extraneous without friction；When there is vibration in environment, frequency modulation
The inertia force of amount makes reed produce the f rotations around the shaft of flexural deformation, driver, and then sends out the contact point of transducer and driver
Changing, transducer produce flexural deformation；The driver rotation of any direction around the shaft, which all deforms transducer end, to be increased, when
The corner of driver increases to transducer deflection when making transducer and tangent circular arc facial contour on driver and reaches maximum, driver
Further rotating will not make transducer deflection continue to increase；On the contrary, in reed and driver reseting procedure transducer deformation
Amount is gradually reduced；Above-mentioned transducer deflection alternately increases with converting mechanical energy into electric energy during reducing.
In the present invention, the deflection when circular arc facial contour on transducer and driver is tangent is maximum, now
Maximum crushing stress on piezoelectric film is less than its allowable value, the bending deformation quantity of transducer end is not more than deflection allowableWherein：B=1- α+α β, A=α4(1-β)2-4
α3(1-β)+6α2(1- β) -4 α (1- β)+1,α=hm/ H, β=Em/Ep, hmFor substrate
Thickness, H be transducer gross thickness, EmAnd EpThe respectively Young's modulus of substrate and piezoelectricity membrane material, k31WithRespectively press
The electromechanical coupling factor and permissible compression stress of electric material, L are the length of transducer.
Advantage and characteristic：Piezoelectric film is subjected only to compression and controls transducer maximum deformation quantity by driver in work, therefore
Reliability is high, effective band is wide, suitable for high intensity and the occasion of large amplitude.
Brief description of the drawings
Fig. 1 is the structural representation of energy accumulator in a preferred embodiment of the present invention；
Fig. 2 is Fig. 1 A-A sectional views；
Fig. 3 is that the structural profile of driver in a preferred embodiment of the present invention is intended to；
Fig. 4 is Fig. 3 left view.
Embodiment
Framework a is provided with left side wall a1, right side wall a2, front side wall a3 and rear wall a4, through screw on left side wall a1 boss
Two transducer c are installed with pressing plate b, dividing plate d is crimped between two transducer c fixing end；Transducer c by substrate c1 and
Piezoelectric film c2 bondings form, and two transducer c substrate c1 is close to installation；Driver e pin-and-hole e1 is enclosed on rotating shaft f, rotating shaft f
Both ends are separately mounted on front side wall a3 and rear wall a4；Driver e outer surface is by two face profile e2 and two circular arcs
Facial contour e3 is formed, and two face profile e2 are parallel to each other and centre distance away from rotating shaft f is equal, two circular arc facial contour e3's
Radius is equal and the center of circle is identical；Two transducer c free end is acted against on face profile e2, two transducer c right-hand end
Face and rotating shaft f center co-planar；Reed g is inserted with the elongated slot e4 on circular arc facial contour e3 on the right side of driver e and through spiral shell
Nail is fixed, and on right side wall a2 boss, tune is provided with reed g through screw and pressing plate b through screw for the reed g other end
Frequency quality h.
It is flat construction before transducer c installations and after installation and when extraneous without friction；When there is vibration in environment, frequency modulation
Amount h inertia force makes reed g produce flexural deformation, driver e f rotations, and then make connecing for transducer c and driver e around the shaft
Contact changes, transducer c produces flexural deformation；The rotation of driver e f any directions around the shaft all makes transducer c ends
Deformation increase, the transducer c when driver e corner, which increases to, makes that circular arc facial contour e3 is tangent on transducer c and driver e
Deflection reaches maximum, and driver e further rotation will not make transducer c deflection continue to increase；On the contrary, reed g and
Transducer c deflection is gradually reduced in driver e reseting procedures；Above-mentioned transducer c deflections alternately increase the mistake with reducing
Electric energy is converted mechanical energy into journey.
In the present invention, the deflection when circular arc facial contour e3 on transducer c and driver e is tangent is maximum, now piezoelectricity
Maximum crushing stress on film c2 is less than its allowable value, the bending deformation quantity of transducer c ends is not more than deflection allowableWherein：B=1- α+α β, A=α4(1-β)2-4
α3(1-β)+6α2(1- β) -4 α (1- β)+1,α=hm/ H, β=Em/Ep, hmFor substrate
Thickness, H be transducer gross thickness, EmAnd EpRespectively substrate c1 and piezoelectric film c2 materials Young's modulus, k31WithRespectively
For the electromechanical coupling factor and permissible compression stress of piezoelectric, L is transducer c length.
Claims (1)
- A kind of 1. ultralow frequency piezoelectric vibratory energy harvester, it is characterised in that：Framework is provided with left and right and front-rear side walls, the boss of left side wall On through screw and pressing plate two transducers are installed, be crimped with dividing plate between two transducer fixing ends；Transducer by substrate and Piezoelectric film bonding forms, and the substrate of two transducers is close to installation；The pin-and-hole of driver is enclosed in rotating shaft, and rotating shaft both ends are pacified respectively On front-rear side walls；The outer surface of driver is made up of two face profiles and two circular arc facial contours, two face profiles It is parallel to each other and centre distance away from rotating shaft is equal, the radius of two circular arc facial contours is equal and the center of circle is identical；Two transducers Free end act against on face profile, its right end face of two transducers and the center co-planar of rotating shaft；On the right side of driver Circular arc facial contour on elongated slot in be inserted with reed and fixed through screw, the other end of reed is arranged on right side through screw and pressing plate On the boss of wall, frequency modulation mass is installed through screw on reed；It is flat before transducer installation and after installation and when extraneous without friction Straight structure, when the corner of driver around the shaft, which increases to, makes transducer and tangent circular arc facial contour on driver, transducer deforms Amount is up to maximum, and now the maximum crushing stress on piezoelectric film is less than its allowable value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727216.1A CN107359810B (en) | 2017-08-17 | 2017-08-17 | Ultralow-frequency piezoelectric vibration energy harvester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727216.1A CN107359810B (en) | 2017-08-17 | 2017-08-17 | Ultralow-frequency piezoelectric vibration energy harvester |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107359810A true CN107359810A (en) | 2017-11-17 |
| CN107359810B CN107359810B (en) | 2023-04-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710727216.1A Active CN107359810B (en) | 2017-08-17 | 2017-08-17 | Ultralow-frequency piezoelectric vibration energy harvester |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768576A (en) * | 2019-11-01 | 2020-02-07 | 华北电力大学 | Energy collecting device suitable for ultralow frequency rotary motion |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120206016A1 (en) * | 2011-02-11 | 2012-08-16 | Georgia Tech Research Corporation | Piezoelectric micromechanical energy harvesters |
| US20120293043A1 (en) * | 2010-01-27 | 2012-11-22 | Ishikawa Prefecture | Transducer for ultrasonic motor |
| CN104485851A (en) * | 2015-01-07 | 2015-04-01 | 浙江师范大学 | Pulling and pressing type vibration energy harvester |
| CN106026771A (en) * | 2016-06-15 | 2016-10-12 | 浙江师范大学 | Self-frequency modulating piezoelectric flow energy capture device |
-
2017
- 2017-08-17 CN CN201710727216.1A patent/CN107359810B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120293043A1 (en) * | 2010-01-27 | 2012-11-22 | Ishikawa Prefecture | Transducer for ultrasonic motor |
| US20120206016A1 (en) * | 2011-02-11 | 2012-08-16 | Georgia Tech Research Corporation | Piezoelectric micromechanical energy harvesters |
| CN104485851A (en) * | 2015-01-07 | 2015-04-01 | 浙江师范大学 | Pulling and pressing type vibration energy harvester |
| CN106026771A (en) * | 2016-06-15 | 2016-10-12 | 浙江师范大学 | Self-frequency modulating piezoelectric flow energy capture device |
Non-Patent Citations (1)
| Title |
|---|
| 阚君武;徐海龙;王淑云;汪彬;赵子超;程光明;: "多振子串联压电俘能器性能分析与测试" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768576A (en) * | 2019-11-01 | 2020-02-07 | 华北电力大学 | Energy collecting device suitable for ultralow frequency rotary motion |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107359810B (en) | 2023-04-25 |
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