CN103475265A - Bistable double-piezoelectric cantilever beam vibration energy collector - Google Patents
Bistable double-piezoelectric cantilever beam vibration energy collector Download PDFInfo
- Publication number
- CN103475265A CN103475265A CN2013104230120A CN201310423012A CN103475265A CN 103475265 A CN103475265 A CN 103475265A CN 2013104230120 A CN2013104230120 A CN 2013104230120A CN 201310423012 A CN201310423012 A CN 201310423012A CN 103475265 A CN103475265 A CN 103475265A
- Authority
- CN
- China
- Prior art keywords
- piezoelectric
- cantilever beam
- cantilever
- magnet
- vibration
- 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.)
- Pending
Links
Images
Abstract
The invention discloses a bistable double-piezoelectric cantilever beam vibration energy collector. The bistable double-piezoelectric cantilever beam vibration energy collector is characterized in that two cantilever beams are oppositely arranged on a horizontal line in a left-and-right mode, an internal magnet is installed at the free end of the cantilever beam on the left side, an external magnet is installed at the free end of the cantilever beam on the right side, the fixed ends of the two cantilever beams are fixedly installed on the vertical plane of a right-angle base, the external magnet and the internal magnet are arranged in the mode that the magnetic polarity of the external magnet and the magnetic polarity of the internal magnet are oppositely rejected with each other, piezoelectric patches are pasted at the positions, 2-3mm away from the vertical plane of the right-angle base, of the fixed ends of the two cantilever beams, vibration of the cantilever beams enables the piezoelectric patches to generate electric energy, and the piezoelectric patches are connected with a lead to output the electric energy. Random excitation vibration is carried out on the variable environment, and the electric energy can be effectively converted through the bistable double-piezoelectric cantilever beam vibration energy collector under the condition that structure parameters are fixed and unchanged. Real-time adjustment on the distance of the magnets is required to be continuously carried out through the rigid supporting external magnet according to variation of environmental excitation strength. The bistable double-piezoelectric cantilever beam vibration energy collector is arranged beside a road and the field having the vibration excitation background, and the vibration energy can be converted into the electric energy.
Description
Technical field
The invention belongs to vibration or piezoelectric energy switch technology, be specifically related to a kind of two piezoelectric cantilevers of bistable that adopt piezoelectric cantilever supports outer magnet, vibrational energy is gathered to the device of generating.
Background technology
In recent years, along with the development of microelectronics and radio wave technology, handheld electronic devices and wireless senser have entered the epoch small-sized, low power consumption.Generally, these equipment are all to rely on traditional battery that energy is provided, as Ni-MH battery, lithium polymer battery etc.But well-known, the main shortcoming of this battery is: the one, and (with respect to microsensor) volume is relatively large, has limited the further miniaturization of microsensor; The 2nd, energy supply time or power limited, need after use a period of time to change or charging, and especially for being in the wireless senser of awful weather or far zone, this is a very harsh restriction condition.Because energy collecting device can become electric energy to the power conversion in environment, so be subject to increasingly extensive attention.
In vibration energy collector, piezoelectric type vibrational energy acquisition mode is comparatively general, and it utilizes the effect of piezoelectric crystal (being subject to extraneous vibration power) and causes flowing of its internal charge and the generation electric energy.Because the linear pattern cantilever beam structure can produce maximum amount of deflection and submissive coefficient, there is lower resonance frequency and the wider advantages such as dynamic range, become the first-selected structure of piezoelectric type vibration energy collector.But the defect of this energy collecting device is that to reach the pumping signal frequency band of maximum output narrow, be difficult to environment in effective vibrational excitation of wider frequency range (comparatively common with low frequency component) be complementary.For overcoming this defect, non-linear piezoelectric cantilever vibration energy harvester becomes study hotspot, and this energy collecting device can show better vibrational energy acquisition performance on broad spectrum.
Structure, non-linear piezoelectric cantilever vibration energy harvester adopts single piezoelectric cantilever, and the support of its external magnet is rigid support normally, and piezoelectric cantilever carries out bistable oscillation with vibrational excitation around external magnet.When the vibrational excitation undercapacity, the response of cantilever beam can't reach significantly bistable transition vibration, thereby has reduced energy converting between mechanical efficiency.In order to improve conversion efficiency, the structure of supports outer magnet just becomes key issue so.The present invention proposes to make this problem be resolved.
Summary of the invention
The objective of the invention is, a kind of composite structure of piezoelectric cantilever supports outer magnet has been proposed, form the two piezoelectric cantilever vibration energy harvesters of a kind of bistable, the system that can guarantee also can be vibrated in bistable state under the low-intensity incentive condition, realizes the raising of energy converting between mechanical efficiency.
Below in conjunction with accompanying drawing, technical scheme of the present invention is explained.The two piezoelectric cantilever vibration energy harvesters of bistable comprise: cantilever beam, magnet, piezoelectric patches and right angle pedestal etc., two cantilever beams are placed in same level line left and right and arrange, the free end of left side cantilever beam is equipped with internal magnet, the free end of right side cantilever beam is equipped with external magnet, and the stiff end of two cantilever beams is fixedly mounted on the vertical plane of right angle pedestal.External magnet is relative with the magnetic polarity of internal magnet repels setting.Be pasted with respectively piezoelectric patches at each cantilever beam stiff end apart from the position of right angle pedestal vertical plane 2-3mm.By the cantilever vibration of beam, make piezoelectric patches produce electric energy, piezoelectric patches is connected to lead-in wire electric energy is exported.
Know-why of the present invention is, two blocks of magnet that are arranged on the cantilever beam of left and right repel mutually because polarity is identical, according to its technical pattern, form bistable system, and two magnet support by elastic cantilever.When the external environment vibrational excitation reaches some strength, left and right two cantilever beams can form and produce bistable transition vibration around initial rest position.Adopt two magnet piezoelectric cantilever supporting constructions, when ambient vibration is arbitrary excitation, two stable equilibrium point positions can constantly change along with the time, so also change at random in time of transition vibration extreme position.In the transition vibration processes, the left and right upper and lower bending of two cantilever beams makes the lip-deep piezoelectric patches distortion of beam, and according to direct piezoelectric effect, piezoelectric patches has charge generation, can be by electric energy or the Voltage-output produced through the electric energy output lead.
The beneficial effect of characteristics of the present invention and generation is: for the environment random encourage vibration changed, adopt the two Piezoelectric Cantilever Beams of bistable of piezoelectric cantilever supports outer magnet, under structural parameters immobilize situation, system can be more effectively electric energy by the random vibration power conversion of Strength Changes.The inside and outside magnet system of rigid support needs the variation according to environmental excitation intensity, constantly the spacing of magnet is adjusted in real time.This device is arranged on to the road side and has the occasion under the vibrational excitation background, vibrational energy can be converted to electric energy.
The accompanying drawing explanation
Fig. 1 is structure of the present invention and principle schematic.
Fig. 2 is the voltage waveform of stimulation level piezoelectric cantilever supports outer magnet system output while being 1V.
Fig. 3 is the voltage waveform of stimulation level piezoelectric cantilever supports outer magnet system output while being 0.5V.
Fig. 4 is the voltage waveform of stimulation level piezoelectric cantilever supports outer magnet system output while being 0.1V.
Fig. 5 is the voltage waveform of stimulation level rigid support external magnet system output while being 1V.
Fig. 6 is the voltage waveform of stimulation level rigid support external magnet system output while being 0.5V.
Fig. 7 is the voltage waveform of stimulation level rigid support external magnet system output while being 0.1V.
Embodiment
Below in conjunction with accompanying drawing and by embodiment, technical scheme of the present invention is described further.
The structure of the two piezoelectric cantilever vibration energy harvesters of bistable forms: two cantilever beams are placed in same level line left and right and arrange, the free end of left side cantilever beam 1 is equipped with internal magnet 2, the free end of right side cantilever beam 3 is equipped with external magnet 4, the stiff end of two cantilever beams is fixedly mounted on the vertical plane of right angle pedestal 5, and external magnet is relative with the magnetic polarity of internal magnet repels setting.Be pasted with respectively piezoelectric patches 6 at each cantilever beam stiff end apart from the position of right angle pedestal vertical plane 2-3mm, by the cantilever vibration of beam, make piezoelectric patches produce electric energy, piezoelectric patches is connected to lead-in wire electric energy is exported.The spacing of internal magnet and external magnet is 6～9mm.The interior spacing with external magnet will be calculated and test according to the concrete structure parameter (as cantilever beam size, magnet size etc.) of system and determine.
As embodiment: left side cantilever beam material is copper, and its parameters of structural dimension is: length 60mm, width 10mm, thickness 0.3mm.The dimensional parameters of left side piezoelectric patches is: long 53mm, wide 10mm, thick 0.3mm.Piezoelectric patches sticks on cantilever beam surface anchor portion, apart from right angle pedestal wall surface 2mm.Right side cantilever beam material is also for copper: its parameters of structural dimension is: length 70mm, width 10mm, thickness 0.3mm.The dimensional parameters of right side piezoelectric patches is: long 62mm, wide 10mm, thick 0.3mm.The position that this piezoelectric patches is pasted is also 2mm far from pedestal wall surface, right angle.The material of interior external magnet is all neodymium iron boron (Nd
2fe
14b), its parameters of structural dimension is identical, is: long 5mm, wide 10mm, high 20mm.Magnet pasting is at the cantilever beam free end, and the spacing of interior external magnet is 8mm.
After two magnet distances are adjusted to suitable position, its energy acquisition output average voltage can be obtained optimal value, this is because the two piezoelectric cantilever systems of this bistable have time dependent potential function, system can be under the environmental excitation condition of low-intensity or high strength variation, still can reach the transition vibration of bistable, so system can realize high efficiency energy converting between mechanical.
This device is arranged on actuating vibration table and carries out varying strength excitation experiment, obtain the output voltage waveforms of Fig. 2～Fig. 4, its actuating vibration table excitation density is respectively 1V, 0.5V and tri-stimulation levels of 0.1V, obtains corresponding output voltage mean-square value V
rmsbe respectively 1.3538V, 0.9948V and 0.4579V.In order to compare, piezoelectric cantilever supports and the implementation result of rigid support external magnet structure, and Fig. 5～Fig. 7 is the output voltage waveforms of rigid support external magnet structure.The spacing of interior external magnet is still 8mm, and the actuating vibration table excitation density still is respectively 1V, 0.5V and tri-stimulation levels of 0.1V, three corresponding output voltage mean-square value V
rmsbe respectively 0.6744V, 0.4953V and 0.2374V.From overall output voltage values, can see, piezoelectric cantilever support system specific rigidity support system can be changed the more high efficiency electric energy of output.Illustrate that the present invention is arranged in the vibrational excitation environment of change intensity, can effectively obtain vibrational energy and be converted to electric energy.
Claims (2)
1. two piezoelectric cantilever vibration energy harvesters of bistable, comprise: cantilever beam, magnet, piezoelectric patches and right angle pedestal etc., it is characterized in that: two cantilever beams are placed in same level line left and right and arrange, the free end of left side cantilever beam (1) is equipped with internal magnet (2), the free end of right side cantilever beam (3) is equipped with external magnet (4), the stiff end of two cantilever beams is fixedly mounted on the vertical plane of right angle pedestal (5), external magnet is relative with the magnetic polarity of internal magnet repels setting, be pasted with respectively piezoelectric patches (6) at each cantilever beam stiff end apart from the position of right angle pedestal vertical plane 2-3mm, by the cantilever vibration of beam, make piezoelectric patches produce electric energy, piezoelectric patches is connected to lead-in wire electric energy is exported.
2. according to the two piezoelectric cantilever vibration energy harvesters of bistable claimed in claim 1, it is characterized in that: described internal magnet (2) is 6～9mm with the spacing of external magnet (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104230120A CN103475265A (en) | 2013-09-16 | 2013-09-16 | Bistable double-piezoelectric cantilever beam vibration energy collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013104230120A CN103475265A (en) | 2013-09-16 | 2013-09-16 | Bistable double-piezoelectric cantilever beam vibration energy collector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103475265A true CN103475265A (en) | 2013-12-25 |
Family
ID=49799997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013104230120A Pending CN103475265A (en) | 2013-09-16 | 2013-09-16 | Bistable double-piezoelectric cantilever beam vibration energy collector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103475265A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105156260A (en) * | 2015-08-26 | 2015-12-16 | 哈尔滨工业大学 | Oscillating type hydrofoil end vibration excitation wave energy conversion device |
| WO2016173151A1 (en) * | 2015-04-28 | 2016-11-03 | 南京航空航天大学 | Piezoelectric oscillator structure for vibration energy recovery |
| CN106160575A (en) * | 2016-08-04 | 2016-11-23 | 国网江西省电力公司电力科学研究院 | A kind of low frequency magnetic field energy collecting device using Piezoelectric anisotropy tuning fork |
| CN107302323A (en) * | 2017-07-10 | 2017-10-27 | 天津大学 | Three-dimensional piezoelectric cantilever beam vibrational energy acquisition system |
| CN107994807A (en) * | 2016-10-26 | 2018-05-04 | 中国科学院上海微系统与信息技术研究所 | Low vibration threshold value monitoring Secondary energy collector based on ferromagnetic cantilever beam |
| CN108736763A (en) * | 2018-06-14 | 2018-11-02 | 电子科技大学 | A kind of two-way series broadband piezoelectric harvester of parallel circuit |
| CN109831118A (en) * | 2019-01-25 | 2019-05-31 | 天津大学 | A kind of non-linear piezoelectric vibration energy collector of beam type |
| CN111852771A (en) * | 2020-07-29 | 2020-10-30 | 西南石油大学 | Small wind power generation device and method adaptive to wind direction and wind speed |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110048133A1 (en) * | 2009-08-31 | 2011-03-03 | University Of Louisville Research Foundation, Inc. | Vibration element coupled with non-linear force to improve non-resonant frequency response |
| CN102064745A (en) * | 2010-11-15 | 2011-05-18 | 中国人民解放军国防科学技术大学 | Bistable piezoelectric cantilever beam vibrator device |
| CN103036478A (en) * | 2013-01-11 | 2013-04-10 | 浙江工商大学 | Efficient wideband vibrating energy collector with elastic amplifying mechanism |
-
2013
- 2013-09-16 CN CN2013104230120A patent/CN103475265A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110048133A1 (en) * | 2009-08-31 | 2011-03-03 | University Of Louisville Research Foundation, Inc. | Vibration element coupled with non-linear force to improve non-resonant frequency response |
| CN102064745A (en) * | 2010-11-15 | 2011-05-18 | 中国人民解放军国防科学技术大学 | Bistable piezoelectric cantilever beam vibrator device |
| CN103036478A (en) * | 2013-01-11 | 2013-04-10 | 浙江工商大学 | Efficient wideband vibrating energy collector with elastic amplifying mechanism |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016173151A1 (en) * | 2015-04-28 | 2016-11-03 | 南京航空航天大学 | Piezoelectric oscillator structure for vibration energy recovery |
| CN105156260A (en) * | 2015-08-26 | 2015-12-16 | 哈尔滨工业大学 | Oscillating type hydrofoil end vibration excitation wave energy conversion device |
| CN105156260B (en) * | 2015-08-26 | 2017-06-13 | 哈尔滨工业大学 | Swing type hydrofoil end exciting Wave energy converting device |
| CN106160575A (en) * | 2016-08-04 | 2016-11-23 | 国网江西省电力公司电力科学研究院 | A kind of low frequency magnetic field energy collecting device using Piezoelectric anisotropy tuning fork |
| CN106160575B (en) * | 2016-08-04 | 2017-11-24 | 国网江西省电力公司电力科学研究院 | A kind of low frequency magnetic field energy collecting device using Piezoelectric anisotropy tuning fork |
| CN107994807A (en) * | 2016-10-26 | 2018-05-04 | 中国科学院上海微系统与信息技术研究所 | Low vibration threshold value monitoring Secondary energy collector based on ferromagnetic cantilever beam |
| CN107994807B (en) * | 2016-10-26 | 2020-02-14 | 中国科学院上海微系统与信息技术研究所 | Low-vibration threshold monitoring secondary energy collector based on ferromagnetic cantilever beam |
| CN107302323A (en) * | 2017-07-10 | 2017-10-27 | 天津大学 | Three-dimensional piezoelectric cantilever beam vibrational energy acquisition system |
| CN108736763A (en) * | 2018-06-14 | 2018-11-02 | 电子科技大学 | A kind of two-way series broadband piezoelectric harvester of parallel circuit |
| CN109831118A (en) * | 2019-01-25 | 2019-05-31 | 天津大学 | A kind of non-linear piezoelectric vibration energy collector of beam type |
| CN109831118B (en) * | 2019-01-25 | 2023-09-01 | 天津大学 | Cantilever beam type nonlinear piezoelectric vibration energy collector |
| CN111852771A (en) * | 2020-07-29 | 2020-10-30 | 西南石油大学 | Small wind power generation device and method adaptive to wind direction and wind speed |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103354434A (en) | Bistable piezoelectric cantilever beam vibration energy collector | |
| CN103475265A (en) | Bistable double-piezoelectric cantilever beam vibration energy collector | |
| Li et al. | Performance comparison of electromagnetic energy harvesters based on magnet arrays of alternating polarity and configuration | |
| Chen et al. | Energy harvesting and wireless power transmission by a hybridized electromagnetic–triboelectric nanogenerator | |
| CN102790547A (en) | Bistable and double cantilever beam piezoelectric power generating device | |
| CN104836478A (en) | Piezoelectric-electromagnetic composite low-frequency broadband energy harvester | |
| CN107302323A (en) | Three-dimensional piezoelectric cantilever beam vibrational energy acquisition system | |
| CN104079206A (en) | Cantilever type non-linear three-stable-state device and application thereof | |
| CN104113232A (en) | Wind-induced vibration piezoelectric generator | |
| CN103414379A (en) | Piezoelectric energy collector based on linear resonator and nonlinear vibration exciter | |
| CN102790548A (en) | Bistable composite cantilever beam piezoelectric power generating device | |
| CN103346696A (en) | Array-type compound energy collector | |
| CN102647112B (en) | Rotary piezoelectric power generator | |
| CN105680720A (en) | Multi-degree-of-freedom piezoelectric-electromagnetic composite multi-directional broadband kinetic energy collector | |
| CN105226994A (en) | Multifrequency coupled vibrations energy capture device | |
| CN104270032B (en) | Bistable state sphere composite cantilever piezoelectric generating device | |
| CN104377993A (en) | Automatic parameter regulating bistable-state piezoelectric power generation structure | |
| CN103746604A (en) | Photonic crystal power generating device based on lateral vibration band gap | |
| CN103227586A (en) | Branch cantilever beam vibration generator and power generation method thereof | |
| CN105281599A (en) | Sound energy collector by adopting phonon crystal and electromechanical Helmholtz resonator | |
| CN103762888B (en) | Lever ultra-magnetic telescopic energy gathering apparatus | |
| CN202524321U (en) | Vertical-vibration horizontal-swinging type power generation device of low-frequency large-amplitude piezoelectric cantilever beam | |
| CN203416192U (en) | Piezoelectric and electromagnetic coupling-based composite broadband vibration energy acquisition device | |
| CN106803726B (en) | Low-frequency vibration electromagnetic energy collector | |
| CN204498019U (en) | Array piezoelectricity magnetic coupling energy harvester |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20131225 |