CN107359810B - Ultralow-frequency piezoelectric vibration energy harvester - Google Patents
Ultralow-frequency piezoelectric vibration energy harvester Download PDFInfo
- Publication number
- CN107359810B CN107359810B CN201710727216.1A CN201710727216A CN107359810B CN 107359810 B CN107359810 B CN 107359810B CN 201710727216 A CN201710727216 A CN 201710727216A CN 107359810 B CN107359810 B CN 107359810B
- Authority
- CN
- China
- Prior art keywords
- side wall
- exciter
- transducers
- rotating shaft
- transducer
- 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.)
- Active
Links
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 11
- 238000009434 installation Methods 0.000 claims abstract description 4
- 238000005192 partition Methods 0.000 claims abstract description 4
- 238000010248 power generation Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000034 method Methods 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
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002513 implantation Methods 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
Images
Classifications
-
- 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
Landscapes
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention relates to an ultralow-frequency piezoelectric vibration energy harvester, and belongs to the field of piezoelectric power generation. The frame is provided with a left side wall, a right side wall, a front side wall and a rear side wall, two transducers are arranged on a boss of the left side wall, a partition board is pressed between the fixed ends of the transducers, and substrates of the two transducers are installed close to each other; the pin hole of the exciter is sleeved on the rotating shaft, and two ends of the rotating shaft are arranged on the front side wall and the rear side wall; the outer surface of the exciter consists of two plane outlines and two arc-shaped surface outlines; the free ends of the two transducers are propped against the plane outline, and the right side end surfaces of the two transducers are coplanar with the center of the rotating shaft; a reed is inserted in a long groove on the arc surface contour of the right side of the exciter, the other end of the reed is arranged on a boss on the right side wall, and the reed is provided with a frequency modulation mass; the transducer is in a straight structure before and after installation and when the outside is free from vibration, the rotation angle of the exciter around the rotating shaft is increased to enable the deformation of the transducer to be maximum when the transducer is tangent to the contour of the arc surface on the exciter, and the maximum compressive stress on the piezoelectric film is smaller than the allowable value.
Description
Technical Field
The invention belongs to the technical field of piezoelectric power generation and energy recovery, and particularly relates to an ultralow-frequency piezoelectric vibration energy harvester.
Background
The research of collecting environmental energy to generate electricity and constructing a miniature energy harvester by utilizing the positive piezoelectric effect of a piezoelectric material has become a hot spot at home and abroad, and the purpose of the miniature energy harvester is to replace a battery to supply power for a remote sensing, implantation monitoring system and a portable micro-power electronic product. At present, more than 10 environmental energies can be effectively recovered by utilizing piezoelectric materials, and more researches are carried out: environmental vibration energy, rotational kinetic energy of machine tools, vehicles, engines, generator spindles, bearings and the like, movement of limbs and organs of a person, fluid energy such as waves, wind, rivers and the like. Although the structure, principle, characteristics and the like of the piezoelectric energy harvester proposed for various energies are different, the piezoelectric energy harvester basically utilizes the bidirectional bending deformation of the energy transducer to generate electricity, and the piezoelectric film is subjected to alternating tensile-compressive stress in operation; because the brittle piezoelectric material is not tensile and pressure-resistant, the Xu Yongla stress is far lower than the allowable compressive stress, and the piezoelectric film is easy to damage due to overlarge tensile stress in operation, so the reliability is low; in addition, the existing piezoelectric energy harvester basically utilizes the inertial force of the additional mass on the transducer to realize bending deformation power generation, and has larger amplitude when the excitation frequency is close to the fundamental frequency and smaller amplitude when other frequencies are used, so that the piezoelectric energy harvester is easy to damage under the ultra-low frequency-large amplitude environment due to overlarge deformation, has poor power generation capability when other frequencies are used or does not generate power. Therefore, in order to popularize and apply the piezoelectric energy harvester, the problems of reliability, effective bandwidth and the like of the piezoelectric energy harvester need to be solved.
Disclosure of Invention
The invention provides an ultralow-frequency piezoelectric vibration energy harvester, which adopts the following implementation scheme: the frame is provided with a left side wall, a right side wall, a front side wall and a rear side wall, two transducers are arranged on a boss of the left side wall through screws and a pressing plate, and a partition plate is pressed between fixed ends of the two transducers; the transducers are formed by bonding a substrate and a piezoelectric film, and the substrates of the two transducers are installed close to each other; the pin hole of the exciter is sleeved on the rotating shaft, and two ends of the rotating shaft are respectively arranged on the front side wall and the rear side wall; the outer surface of the exciter consists of two plane contours and two arc surface contours, the two plane contours are parallel to each other and have the same distance from the center of the rotating shaft, and the two arc surface contours have the same radius and the same circle center; the free ends of the two transducers are propped against the plane outline, and the right side end surfaces of the two transducers are coplanar with the center of the rotating shaft; the reed is inserted in the long groove on the arc surface contour of the right side of the exciter and fixed by the screw, the other end of the reed is arranged on the boss of the right side wall by the screw and the pressing plate, and the frequency modulation mass is arranged on the reed by the screw.
The transducer is in a straight structure before and after installation and when the outside is free from vibration; when vibration exists in the environment, the inertia force of the frequency modulation mass causes the reed to bend and deform, the exciter rotates around the rotating shaft f, and then the contact point between the transducer and the exciter changes, and the transducer bends and deforms; the rotation of the exciter in any direction around the rotating shaft enables the deformation of the end part of the energy converter to be increased, when the rotation angle of the exciter is increased to enable the energy converter to be tangent with the outline of the arc surface on the exciter, the deformation of the energy converter is maximum, and the deformation of the energy converter is not increased continuously when the exciter rotates further; conversely, the deformation of the transducer is gradually reduced in the resetting process of the reed and the exciter; the deformation of the energy converter is converted into electric energy in the process of alternately increasing and decreasing.
In the invention, the deformation of the transducer is maximum when the transducer is tangent to the contour of the arc surface on the exciter, the maximum compressive stress on the piezoelectric film is smaller than the allowable value, and the bending deformation of the end part of the transducer is not larger than the allowable deformation
Wherein: b=1- α+αβ, a=α 4 (1-β) 2 -4α 3 (1-β)+6α 2 (1-β)-4α(1-β)+1，/>
α＝h m /H，β＝E m /E p ，h m For the thickness of the substrate, H is the total thickness of the transducer, E m And E is p Young's modulus, k of substrate and piezoelectric film material respectively 31 And->
The electromechanical coupling coefficient and allowable compressive stress of the piezoelectric material, respectively, and L is the length of the transducer.
Advantages and features: the piezoelectric film only bears compressive stress and the exciter controls the maximum deformation of the transducer in operation, so the piezoelectric film has high reliability and wide effective band, and is suitable for occasions with high strength and large amplitude.
Drawings
FIG. 1 is a schematic diagram of an energy harvester according to a preferred embodiment of the invention;
FIG. 2 isbase:Sub>A sectional view A-A of FIG. 1;
FIG. 3 is a schematic cross-sectional view of an actuator in accordance with a preferred embodiment of the present invention;
fig. 4 is a left side view of fig. 3.
Detailed Description
The frame a is provided with a left side wall a1, a right side wall a2, a front side wall a3 and a rear side wall a4, two transducers c are mounted on a boss of the left side wall a1 through screws and a pressing plate b, and a partition d is pressed between fixed ends of the two transducers c; the transducers c are formed by bonding a substrate c1 and a piezoelectric film c2, and the substrates c1 of the two transducers c are installed close to each other; the pin hole e1 of the exciter e is sleeved on the rotating shaft f, and two ends of the rotating shaft f are respectively arranged on the front side wall a3 and the rear side wall a 4; the outer surface of the exciter e consists of two plane contours e2 and two arc surface contours e3, wherein the two plane contours e2 are parallel to each other and have the same distance from the center of the rotating shaft f, and the two arc surface contours e3 have the same radius and the same circle center; the free ends of the two transducers c are propped against the plane contour e2, and the right end faces of the two transducers c are coplanar with the center of the rotating shaft f; a reed g is inserted in a long groove e4 on the arc surface contour e3 on the right side of the exciter e and is fixed by a screw, the other end of the reed g is arranged on a boss of the right side wall a2 by the screw and the pressing plate b, and the reed g is provided with a frequency modulation mass h by the screw.
The transducer c is in a straight structure before and after installation and when the outside does not vibrate; when vibration exists in the environment, the inertia force of the frequency modulation mass h causes the reed g to generate bending deformation, the exciter e rotates around the rotating shaft f, and then the contact point between the transducer c and the exciter e is changed, and the transducer c generates bending deformation; the rotation of the exciter e in any direction around the rotating shaft f causes the deformation of the end part of the transducer c to be increased, when the rotation angle of the exciter e is increased to enable the transducer c to be tangent with the arc surface contour e3 on the exciter e, the deformation of the transducer c is maximum, and further rotation of the exciter e does not cause the deformation of the transducer c to be increased continuously; conversely, the deformation of the transducer c is gradually reduced in the resetting process of the reed g and the exciter e; the deformation of the transducer c is alternately increased and decreased to convert mechanical energy into electric energy.
In the invention, the deformation amount is maximum when the transducer c is tangent to the arc surface contour e3 on the exciter e, the maximum compressive stress on the piezoelectric film c2 is smaller than the allowable value, and the bending deformation amount of the end part of the transducer c is not larger than the allowable deformation amount
Wherein: b=1- α+αβ, a=α 4 (1-β) 2 -4α 3 (1-β)+6α 2 (1-β)-4α(1-β)+1，/>
α＝h m /H，β＝E m /E p ，h m For the thickness of the substrate, H is the total thickness of the transducer, E m And E is p Young's modulus, k of the material of the substrate c1 and the piezoelectric film c2, respectively 31 And->
The electromechanical coupling coefficient and allowable compressive stress of the piezoelectric material, respectively, L being the length of the transducer c. />
Claims (1)
1. An ultralow-frequency piezoelectric vibration energy harvester is characterized in that: the frame is provided with a left side wall, a right side wall, a front side wall and a rear side wall, two transducers are arranged on a boss of the left side wall through screws and a pressing plate, and a partition plate is pressed between the fixed ends of the two transducers; the transducers are formed by bonding a substrate and a piezoelectric film, and the substrates of the two transducers are installed close to each other; the pin hole of the exciter is sleeved on the rotating shaft, and two ends of the rotating shaft are respectively arranged on the front side wall and the rear side wall; the outer surface of the exciter consists of two plane contours and two arc surface contours, the two plane contours are parallel to each other and have the same distance from the center of the rotating shaft, and the two arc surface contours have the same radius and the same circle center; the free ends of the two transducers are propped against the plane outline, and the right side end surfaces of the two transducers are coplanar with the center of the rotating shaft; a reed is inserted in a long groove on the arc surface contour on the right side of the exciter and is fixed by a screw, the other end of the reed is arranged on a boss on the right side wall by the screw and the pressing plate, and the reed is provided with a frequency modulation mass by the screw; the transducer is in a straight structure before and after installation and has no vibration outside, when the rotation angle of the exciter around the rotating shaft is increased to enable the deformation of the transducer to be maximum when the transducer is tangent to the contour of the arc surface on the exciter, and the maximum compressive stress on the piezoelectric film is smaller than the 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 CN107359810A (en) | 2017-11-17 |
| CN107359810B true CN107359810B (en) | 2023-04-25 |
Family
ID=60288288
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710727216.1A Active CN107359810B (en) | 2017-08-17 | 2017-08-17 | Ultralow-frequency piezoelectric vibration energy harvester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107359810B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110768576B (en) * | 2019-11-01 | 2021-01-19 | 华北电力大学 | Energy collecting device suitable for ultralow frequency rotary motion |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4830165B2 (en) * | 2010-01-27 | 2011-12-07 | 石川県 | Ultrasonic motor vibrator |
| US8680752B2 (en) * | 2011-02-11 | 2014-03-25 | Georgia Tech Research Corporation | Piezoelectric micromechanical energy harvesters |
-
2017
- 2017-08-17 CN CN201710727216.1A patent/CN107359810B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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.振动与冲击.2013,(第22期),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107359810A (en) | 2017-11-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107359823B (en) | Torsional pendulum type piezoelectric energy harvester | |
| US4536674A (en) | Piezoelectric wind generator | |
| CN107332472B (en) | Swing energy harvester | |
| CN107395059B (en) | Wind-driven vibration energy harvester | |
| CN112152508A (en) | Rotary excitation friction-piezoelectric composite generator | |
| CN112187102B (en) | Rotary excitation swing type piezoelectric-friction generator | |
| CN202721630U (en) | Power generation apparatus driven by propeller main shaft | |
| CN103982556B (en) | A kind of rotating speed for wind-driven generator is from the ball bearing of monitoring | |
| CN107359810B (en) | Ultralow-frequency piezoelectric vibration energy harvester | |
| CN107359817B (en) | Wind-induced gyromagnetic excitation piezoelectric generator | |
| CN107359814B (en) | Rotary piezoelectric wind driven generator | |
| CN107359773B (en) | Portable energy harvester | |
| CN107561307B (en) | A kind of self energizing wind direction and wind velocity monitor | |
| CN207069941U (en) | A kind of piezoelectric beam energy accumulator of combined type spring leaf indirect excitation | |
| CN204376763U (en) | A kind of piezoelectric type pipeline water flow electric generator | |
| CN107332466B (en) | Multi-vibrator piezoelectric wind energy capture device | |
| CN112311276B (en) | Self-excitation type piezoelectric generator | |
| CN113271034B (en) | Non-contact indirect excitation dual-purpose generator | |
| CN107395061B (en) | Wind-induced piezoelectric energy harvester | |
| CN107359818B (en) | Piezoelectric windmill | |
| CN107317514B (en) | Combined piezoelectric generator | |
| CN207184304U (en) | A kind of portable energy accumulator | |
| CN112187106B (en) | Equal-radiation excitation rotary energy harvester | |
| CN107317517B (en) | Self-powered power supply for wind driven generator blade monitoring system | |
| CN107395048B (en) | Piezoelectric beam energy harvester indirectly excited by combined spring piece |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |