CN104702147A - Combined type broadband vibration energy collector - Google Patents

Combined type broadband vibration energy collector Download PDF

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Publication number
CN104702147A
CN104702147A CN201510158555.3A CN201510158555A CN104702147A CN 104702147 A CN104702147 A CN 104702147A CN 201510158555 A CN201510158555 A CN 201510158555A CN 104702147 A CN104702147 A CN 104702147A
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China
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piezoelectric
energy collector
magnet
coils
vibrational energy
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CN201510158555.3A
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Chinese (zh)
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CN104702147B (en
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赵兴强
严飞
宋公飞
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南京信息工程大学
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Abstract

The invention discloses a combined type broadband vibration energy collector. The combined type broadband vibration energy collector comprises a shell, a piezoelectric beam, two mass blocks, two coils and two magnets, wherein the piezoelectric beam, the mass blocks, the coils and the magnets are arranged in the shell; one end of the piezoelectric beam is horizontally fixed to the inner wall of the shell, and the other end of the piezoelectric beam is a free end; the two mass blocks are fixed to the upper surface and the lower surface of the free end of the piezoelectric beam respectively; the two coils are fixed to the two mass blocks respectively, and the axes of the coils are perpendicular to the upper surface and the lower surface of the piezoelectric beam; the two magnets are fixed to the inner wall of the shell, like poles are opposite, the magnets and the coils are coaxial, and a gap exists between each magnet and the corresponding coil. The combined type broadband vibration energy collector combines a piezoelectric type vibration energy collector with an electromagnetic type vibration energy collector, energy collection efficiency is improved, the magnets serve as stators installed on the shell, and the reliability of the combined type broadband vibration energy collector is improved; meanwhile, the amplitude of the coils is limited by the magnets, so that the broadband of a frequency band is expanded.

Description

A kind of combined wide-band vibrational energy collector
Technical field
The present invention relates to a kind of vibrational energy collector, especially relate to the broadband vibration energy gatherer of a kind of piezoelectric effect and galvanomagnetic effect compound.
Background technology
Vibrational energy in environment can be converted into electric energy by vibrational energy collector, have that volume is little, energy density is high, the advantage such as non-maintaining, environmental protection, not by the restriction of the problems such as traditional chemical battery capacity, unattended long-term power supply can be realized, have a wide range of applications demand in association areas such as environmental monitoring, building safety monitorings.
According to power conversion mode, vibrational energy collector can be divided into piezoelectric type, electromagnetic type and electrostatic three types.Vibrational energy is converted into the strain energy of piezoelectric by piezoelectric type vibration energy harvester, then is converted into electric energy by piezoelectric effect, has that structure is simple, output voltage and a power density advantages of higher.Electromagnetic vibration energy gatherer, by relative motion between vibration realizing coil and magnet, causes the magnetic flux of coil change and produce induced electromotive force, has that cost is low, output current large and power density advantages of higher.Electrostatic vibrational energy collector needs external power source or Charge Source, and change by vibration the output that capacitance size realizes electric energy, power density is relatively low.Because piezoelectric type and electromagnetic vibration energy gatherer have significant advantage, become the main direction of studying of vibrational energy collector.
In order to improve collection and the transformation efficiency of vibrational energy, current research work mainly concentrates on the aspect such as structure and dimensionally-optimised, high performance material application of vibrational energy collector, but these methods are all the restrictions being subject to theoretical limit.Such as, for piezoelectric type vibration energy harvester, the size of the stress of piezoelectric beam must be limited in the scope of mechanical strength permission, otherwise piezoelectric beam can damage.Propose a kind of new method in recent years: combined vibrating energy harvester, realized by multiple kinds of energy transform mode at a vibration pick-up structure, the theory of the collection of energy and transformation efficiency that break through single mode limits, and improves collection and the transformation efficiency of vibrational energy.The people such as Xiamen University umbrella Hai Sheng propose a kind of piezoelectricity based on MEMS technology-static combined type vibrational energy collector (application number: 201210016196.4), but course of processing more complicated.The people such as the V.R.Challa of the U.S. have installed magnet at the end of piezoelectric cantilever, coil is as stator, devise the vibrational energy collector (Smart Materials and Structures, 2009,18 (9): 095029) of piezoelectricity-Electromagnetic heating.But because magnet is installed on a cantilever beam, easy and device exterior ferromagnetic material interacts, and causes piezoelectric cantilever to be damaged, particularly serious in MEMS.
Vibrational energy collector can be considered a second order vibration system, and when vibration frequency can resonate close to during resonance frequency, now vibrational energy collector output performance is the highest, but frequency bandwidth is usually very narrow, usually only has a few Hz.In order to expand the frequency bandwidth of vibrational energy collector, the cantilever beam composition array (application number: 201310686868.7) of the Qin Li striker different resonant frequencies of Xiamen University, extend frequency bandwidth, but only have a cantilever beam cell operation, the power density of overall device is low.The C. of Honeywell Int Inc opens the nonlinear method adopting bistable state technology, devise nonlinear oscillator (application number: 201080048402.9), spreading bandwidth, but only just can change between two stable states when vibration acceleration is larger.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of combined wide-band vibrational energy collector, improves the collection of vibrational energy and transformation efficiency and reliability, extends working band width simultaneously.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
A kind of combined wide-band vibrational energy collector, comprises shell and is arranged on the piezoelectric beam of enclosure, two masses, two coils, two magnet; One end of described piezoelectric beam is horizontally fixed on the inwall of described shell, and the other end is free end; Two masses are separately fixed at the upper and lower surface of piezoelectric beam free end; Two coils are separately fixed on two masses, and the axis of coil is vertical with the upper and lower surface of piezoelectric beam, to move up and down formation mover with piezoelectric beam, mass; Two magnet like poles are relative, and stator is formed on the top and the bottom that are separately fixed at outer casing inner wall, and magnet and coil coaxially distribute simultaneously, and each magnet is adjacent between coil and there is gap; Described shell is provided with six output ports, and the upper and lower surface of piezoelectric beam is provided with electrode, and electrode is connected with wherein two output ports respectively by plain conductor, exports electric energy; The coiling two ends of two coils are also connected with other four output ports respectively by plain conductor, export electric energy.
Preferably, described gap h is obtained by following formulae discovery: wherein, s 11represent the compliance constant of piezoelectric, h pfor the distance of piezoelectric layer and neutral surface, L and L mbe respectively the length of piezoelectric beam and mass, for the piezoelectric beam vibration shape, for first derivative, for second dervative, ρ mfor piezoelectric strength degree, n is coefficient of safety.
Preferably, the size of described mass is identical.
Preferably, the material of described mass is copper.
Preferably, the size of described magnet is identical.
Preferably, the shape of described magnet is cylinder.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, combined wide-band vibrational energy collector of the present invention, magnet, as amplitude limiting mechanism, by the gap of the vibration limiting of coil between magnet and coil, extends the working band width of device, achieves overload protection simultaneously.
2, combined wide-band vibrational energy collector of the present invention, new structure is adopted piezoelectric type and electromagnetic vibration energy gatherer to be combined dexterously, breach the theory restriction of the transformation efficiency of single mode vibrational energy collector, there is the advantage such as high-energy conversion efficiency and high output performance.
3, combined wide-band vibrational energy collector of the present invention, using magnet as stator, avoids and damages Piezoelectric anisotropy beam because of magnet and external structure generation magnetic interaction power, improve the reliability of device.
Accompanying drawing explanation
Fig. 1 is the structural representation of combined wide-band vibrational energy collector of the present invention.
Fig. 2 is the oscillating component of piezoelectric beam of the present invention, mass and coil composition.
Fig. 3 is magnet arrangement of the present invention and Distribution of Magnetic Field schematic diagram.
Wherein: 1 is shell, 10 is pedestal, and 11 is top, and 12 is bottom, and 2 is piezoelectric beam, and 20 is free end, and 3 is mass, and 4 is coil, and 40 is the axis of coil, and 41 is the coiling two ends of coil, and 5 is magnet, and 6 is output, and 7 is plain conductor.
Embodiment
Be described below in detail embodiments of the present invention, the example of described execution mode is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the execution mode be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
As shown in Figure 1, be wherein a kind of preferred embodiment of the present invention, combined wide-band vibrational energy collector comprises shell 1, piezoelectric beam 2, mass 3, coil 4 and magnet 5.One end of piezoelectric beam 2 is fixed on the pedestal 10 in shell 1, other end free vibration (i.e. free end 20); Two identical masses 3 are arranged on the upper and lower surface of free end 20, form piezoelectric type vibration energy harvester.Two identical coils 4 are separately fixed at the mover two masses 3 being formed electromagnetic vibration energy gatherer, along with two masses 3 move up and down together with piezoelectric beam 2.Two identical magnet 5 are arranged on top 11 and the bottom 12 of shell 1 respectively, as the stator of electromagnetic vibration energy gatherer.In definition Fig. 1, two masses are from top to bottom respectively the first mass and the second mass, the one side that first mass contacts with piezoelectric beam 2 is the lower surface of the first mass, and the one side that the second mass contacts with piezoelectric beam 2 is the upper surface of the second mass.
The upper and lower surface of piezoelectric beam 2 is distributed with electrode, is connected with the output port 6 on shell 1 by plain conductor 7; The coiling two ends 41 of two coils 4 are connected to output port 6.
As wherein a kind of preferred embodiment of the present invention, in installation process, assemble oscillating component and the standing part of combined wide-band vibrational energy collector first respectively.Wherein, oscillating component as shown in Figure 2, comprises piezoelectric beam 2, mass 3, coil 4; Standing part is then shell 1 and magnet 5.Then oscillating component is arranged on pedestal 10, the coiling two ends 41 of two coils 4 is welded on output port 6 simultaneously, for coil 4 exports electric energy, on the electrode two ends of plain conductor 7 being welded on piezoelectric beam 2 and output port 6, for piezoelectric beam 2 exports electric energy.
Two masses 3 are highdensity metal material, as copper, tungsten etc.Preferably copper material of the present invention, because copper density is high, cost is low, and hardness is little, easily processes.The shape of mass 3 is cuboid (as shown in Figure 2) or cylinder.Mass 3 is arranged on the both sides up and down of piezoelectric beam 2 free end 20, forms the piezoelectric type vibration energy harvester part of combined wide-band vibrational energy collector together with piezoelectric beam 2.
Two coils 4 are copper wire winding and form, and the axis 40 of coil is consistent with the thickness direction of piezoelectric beam 2, are fixed on mass 3, and the mover as combined wide-band vibrational energy collector vibrates together along with piezoelectric beam 2, as shown in Figure 2.Certain length is left at the two ends 41 of coil 4 coiling, is convenient to the motion of coil 4, and as shown in Figure 1, and the two ends 41 of coil 4 coiling are connected with output port 6.
As shown in Figure 3, two magnet 5 are the Nd-Fe-B permanent magnet of cylinder or cuboid, be separately fixed at cover top portion 11 corresponding to coil 4 axis 40 direction and bottom 12, coaxial with coil 4, and like pole is mounted opposite, N pole can be all, also can be all S pole, thus the Distribution of Magnetic Field formed as shown in Figure 3, coil 4 has large flux change when moving up and down.Magnet 5, as stator, forms electromagnetic vibration energy gatherer together with coil 4.In addition, magnet 5 is except the stator as electromagnetic vibration energy gatherer, also will as the amplitude limiting mechanism of coil 4, the vibration limiting of each coil is adjacent in the gap between coil at each magnet, namely as in Fig. 1 above the magnet fixed at outer casing inner wall top of the vibration limiting of a coil and above in gap between a coil, below the magnet fixing bottom outer casing inner wall of the vibration limiting of a coil and below in gap between a coil; Extend the frequency bandwidth of vibrational energy collector; realize overload protection; wherein; the size in the gap between magnet and coil is calculated by the relevant parameter such as requirement of strength and size of piezoelectric beam; require that the stress of piezoelectric beam is within the scope of requirement of strength, overload would not occur like this and damage device.
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.

Claims (6)

1. a combined wide-band vibrational energy collector, is characterized in that: comprise shell and be arranged on the piezoelectric beam of enclosure, two masses, two coils, two magnet; One end of described piezoelectric beam is horizontally fixed on the inwall of described shell, and the other end is free end; Two masses are separately fixed at the upper and lower surface of piezoelectric beam free end; Two coils are separately fixed on two masses, and the axis of coil is vertical with the upper and lower surface of piezoelectric beam, to move up and down formation mover with piezoelectric beam, mass; Two magnet like poles are relative, and stator is formed on the top and the bottom that are separately fixed at outer casing inner wall, and magnet and coil coaxially distribute simultaneously, and each magnet is adjacent between coil and there is gap; Described shell is provided with six output ports, and the upper and lower surface of piezoelectric beam is provided with electrode, and electrode is connected with wherein two output ports respectively by plain conductor, exports electric energy; The coiling two ends of two coils are also connected with other four output ports respectively by plain conductor, export electric energy.
2. combined wide-band vibrational energy collector as claimed in claim 1, is characterized in that: described gap h is obtained by following formulae discovery:
Wherein, s 11represent the compliance constant of piezoelectric, h pfor the distance of piezoelectric layer and neutral surface, L and L mbe respectively the length of piezoelectric beam and mass, for the piezoelectric beam vibration shape, first derivative, for second dervative, ρ mfor piezoelectric strength degree, n is coefficient of safety.
3. combined wide-band vibrational energy collector as claimed in claim 1, is characterized in that: the size of described mass is identical.
4. combined wide-band vibrational energy collector as claimed in claim 1, is characterized in that: the material of described mass is copper.
5. combined wide-band vibrational energy collector as claimed in claim 1, is characterized in that: the size of described magnet is identical.
6. combined wide-band vibrational energy collector as claimed in claim 1, is characterized in that: the shape of described magnet is cylinder.
CN201510158555.3A 2015-04-03 2015-04-03 Combined type broadband vibration energy collector CN104702147B (en)

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Cited By (8)

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CN104993738A (en) * 2015-07-09 2015-10-21 清华大学深圳研究生院 Piezoelectric power collector
CN106357159A (en) * 2016-11-04 2017-01-25 华中科技大学 Nonlinear vortex-induced vibration energy collector having force-current-fluid coupling function
CN106803726A (en) * 2015-11-26 2017-06-06 清华大学 Low-frequency vibration electromagnetic energy collector
CN107359826A (en) * 2017-08-28 2017-11-17 北京工业大学 A kind of four side synchronous hunting double mode wideband TRTs
CN107872171A (en) * 2017-12-13 2018-04-03 浙江工商大学 A kind of piezoelectric vibration energy harvester
CN108141154A (en) * 2015-09-15 2018-06-08 密执安州立大学董事会 Collection of energy without lead pacemaker
CN108716521A (en) * 2018-06-01 2018-10-30 中国人民解放军海军工程大学 A kind of energy gathering apparatus based on nonlinear energy trap
CN109150012A (en) * 2018-10-18 2019-01-04 山东理工大学 A kind of piezoelectricity based on wind-induced vibration-Electromagnetic heating generator

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WO2019243877A1 (en) * 2018-06-21 2019-12-26 Kourouma Hamed Mems piezoelectric and electromagnetic device

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US7928634B2 (en) * 2008-04-22 2011-04-19 Honeywell International Inc. System and method for providing a piezoelectric electromagnetic hybrid vibrating energy harvester
CN102185523A (en) * 2011-05-30 2011-09-14 华北电力大学 Minitype composite vibration power generator
WO2012071088A1 (en) * 2010-11-24 2012-05-31 University Of Florida Research Foundation Inc. Wireless power transfer via electrodynamic coupling
CN103199738A (en) * 2013-02-28 2013-07-10 北京理工大学 Piezoelectricity-piezoelectricity combined type broadband energy harvester based on micro-electro-mechanical system (MEMS) technology

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WO2009039293A1 (en) * 2007-09-18 2009-03-26 University Of Florida Research Foundation, Inc. Dul-mode piezoelectric/magnetic vibrational energy harvester
US7928634B2 (en) * 2008-04-22 2011-04-19 Honeywell International Inc. System and method for providing a piezoelectric electromagnetic hybrid vibrating energy harvester
WO2012071088A1 (en) * 2010-11-24 2012-05-31 University Of Florida Research Foundation Inc. Wireless power transfer via electrodynamic coupling
CN102185523A (en) * 2011-05-30 2011-09-14 华北电力大学 Minitype composite vibration power generator
CN103199738A (en) * 2013-02-28 2013-07-10 北京理工大学 Piezoelectricity-piezoelectricity combined type broadband energy harvester based on micro-electro-mechanical system (MEMS) technology

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104993738A (en) * 2015-07-09 2015-10-21 清华大学深圳研究生院 Piezoelectric power collector
CN104993738B (en) * 2015-07-09 2018-02-09 清华大学深圳研究生院 A kind of piezoelectric energy collector
CN108141154A (en) * 2015-09-15 2018-06-08 密执安州立大学董事会 Collection of energy without lead pacemaker
CN106803726A (en) * 2015-11-26 2017-06-06 清华大学 Low-frequency vibration electromagnetic energy collector
CN106803726B (en) * 2015-11-26 2019-05-10 清华大学 Low-frequency vibration electromagnetic energy collector
CN106357159A (en) * 2016-11-04 2017-01-25 华中科技大学 Nonlinear vortex-induced vibration energy collector having force-current-fluid coupling function
CN106357159B (en) * 2016-11-04 2018-07-17 华中科技大学 A kind of Nonlinear Vortex-induced energy collecting device of power-electricity-flow coupling
CN107359826A (en) * 2017-08-28 2017-11-17 北京工业大学 A kind of four side synchronous hunting double mode wideband TRTs
CN107872171A (en) * 2017-12-13 2018-04-03 浙江工商大学 A kind of piezoelectric vibration energy harvester
CN108716521A (en) * 2018-06-01 2018-10-30 中国人民解放军海军工程大学 A kind of energy gathering apparatus based on nonlinear energy trap
CN108716521B (en) * 2018-06-01 2020-08-25 中国人民解放军海军工程大学 Vibration energy collecting device based on nonlinear energy trap
CN109150012A (en) * 2018-10-18 2019-01-04 山东理工大学 A kind of piezoelectricity based on wind-induced vibration-Electromagnetic heating generator

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