CN101764532A - Piezoelectric giant magnetostrictive combined wideband vibration energy collector - Google Patents
Piezoelectric giant magnetostrictive combined wideband vibration energy collector Download PDFInfo
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- CN101764532A CN101764532A CN201010300986A CN201010300986A CN101764532A CN 101764532 A CN101764532 A CN 101764532A CN 201010300986 A CN201010300986 A CN 201010300986A CN 201010300986 A CN201010300986 A CN 201010300986A CN 101764532 A CN101764532 A CN 101764532A
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Abstract
The invention provides a piezoelectric giant magnetostrictive combined wideband vibration energy collector, belonging to the technical field of energy. The collector comprises a frame, a bistable beam, a cantilever beam and a permanent magnet, wherein two ends of the bistable beam are fixed on the frame; the permanent magnet is attached on the bistable beam; one end of the cantilever beam is fixed on the frame, and the other end thereof is arranged by means of suspension; and a positive wire magnetostrictive layer, a piezoelectric layer and a negative wire magnetostrictive layer are connected with each other in sequence. The collector adopts a bistable structure, realizes the conversation of magnetism, machine and electricity with the product characteristic of the magnetostrictive effect of a piezomagnetic phase and the piezoelectric effect of a piezoelectric phase in composite material, and leads an MEMS energy conversation component to be capable of obtaining a lager output power under the environment of low-frequency vibration. The collector not only has simple structure, easy manufacture and small volume, but also can run in the low-frequency environment, and can output larger stable power within the range of wider environment vibration frequency.
Description
Technical field
What the present invention relates to is a kind of device of energy technology field, in particular a kind of piezoelectric giant magnetostrictive combined wideband vibration energy collector.
Background technology
In recent years, along with wireless telecommunications and micro-electromechanical system (MEMS) (Micro-Flectro-Mechanical Systems MEMS (micro electro mechanical system)) continuous advancement in technology, make microsystem ranges of application such as microelectronic device and microsensor constantly enlarge, be widely used in fields such as civilian, medical science, military affairs.Because these equipment are of portable form, it must be self-powered, and the performance of power supply and quality are present most of MEMS technology key in application places.Traditional electrochemical cell supply power mode exist the life-span short, need often to change and shortcoming such as storage power is limited, and change the cell process complexity under certain conditions, cost is very high or not may realize changing.At present, ambient vibration energy acquisition technology is one of effective ways that overcome the above problems.
Energy-collecting method based on vibration generally has three kinds: piezoelectric type, electrostatic and electromagnetic type.With respect to static and electromagnetic type, that piezoelectric energy collector has is simple in structure, energy density is high and the life-span is long, can with advantages such as MEMS processing technology compatibility.Therefore, utilize piezoelectric to obtain ambient vibration and realize that generating becomes the people's attention focus recently.
The MEMS piezoelectric type vibrational energy collector of present fully-integrated manufacturing, also be difficult to satisfy the low energy-consumption electronic device demands of applications: on the one hand, because small its natural frequency of size is higher, usually far above the ambient vibration frequency, the natural environment vibration frequency is generally less than in the 1000Hz scope, and mainly concentrate in the scope less than 100Hz, therefore, present MEMS energy acquisition technology also can't be effectively under low frequency environments (less than 100Hz) carry out energy acquisition; On the other hand, the electric energy power density that is obtained is also less, and depend on the external environment condition vibration frequency, when the system frequency of piezoelectric energy collector and external vibration frequency are complementary when producing resonance, with Maximum Power Output, but when the system frequency of piezoelectric energy collector departs from the external vibration frequency, the power of output will reduce.
Find by prior art documents, document number: IEEE:Transactions on Ultrasonics, Ferroelectrics and Frequency Control (IEEE periodical: ultrasonic, ferroelectric and FREQUENCY CONTROL), 55 (2008) 2104 ~ 2108, Huan Xue, people such as Yuantai Hu disclose a kind of Broadband piezoelectric energyharvesting devices using multiple bimorphs with different operating frequencies (utilizing the broadband piezoelectric energy collector of a plurality of different frequency twin lamellas), and this technology adopts the twin lamella piezoelectric cantilever of a plurality of different natural frequencies to form array by the serial or parallel connection mode and realizes wideer equivalent frequency band.But, increased the physical dimension of piezoelectric energy collector so on the one hand, and made the manufacture process of cantilever beam become complicated.
Further retrieval is found, U.S. Patent number: US6984902, this technology discloses a kind of high efficiency vibration energy collector based on the piezoelectric giant magnetostrictive laminated composite materials, utilize in the composite material product characteristic of the piezoelectric effect of the magnetostrictive effect of pressing the magnetic phase and piezoelectric phase to realize the conversion of magnetic, machine and electricity, though this technology can obtain bigger power output, but unresolved wideband problem, and the big practicality of device is not strong.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of piezoelectric giant magnetostrictive combined wideband vibration energy collector is proposed, make inverting element under the low-frequency vibration environment, obtain bigger power output, to solve that traditional MEMS piezoelectric energy collector working band is narrow, natural frequency is high and problem such as power output is low.
The present invention is achieved through the following technical solutions, the present invention includes: framework, bistable state beam, cantilever beam and permanent magnet, wherein: the two ends of bistable state beam are fixed on the framework, and permanent magnet is attached on the bistable state beam, one end of cantilever beam is fixed on the framework, the unsettled setting of the other end.
Described cantilever beam comprises: main track magnetostrictive layer, piezoelectric layer and negative wire magnetostrictive layer, wherein: main track magnetostrictive layer, piezoelectric layer and negative wire magnetostrictive layer link to each other successively.
The polarised direction of described piezoelectric layer is its thickness direction.
The thickness of described main track mangneto and negative wire magnetostrictive layer is 1 ~ 10 μ m.
Described bistable state beam deflection is arranged in the framework and framework is fixed at two ends.
Described bistable state beam is that micro girder construction is made.
The pole orientation of described permanent magnet is consistent with cantilever beam length direction.
The present invention adopts bistable structure, and utilizes in the composite material product characteristic of the piezoelectric effect of the magnetostrictive effect of pressing the magnetic phase and piezoelectric phase to realize the conversion of magnetic, machine and electricity, makes the MEMS inverting element obtain power output greatly under the low-frequency vibration environment.Compare with existing MEMS piezoelectric energy collector, it is not only simple in structure, makes easily, and volume reduces, and it can run in the low frequency environments, and can export stable power greatly in the ambient vibration frequency range of broad.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the crooked schematic diagram of cantilever beam under the action of a magnetic field among the present invention;
Fig. 3 is bistable state beam among the present invention and two stable position schematic diagrames of permanent magnet.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: framework 1, cantilever beam 2, permanent magnet 3 and bistable state beam 4, wherein: 4 bendings of bistable state beam are arranged in the framework 1, and two ends are fixed on the framework 1, permanent magnet 3 is attached to the lower surface of bistable state beam 4, one end of cantilever beam 2 is fixed on the framework 1, the unsettled setting of the other end.
As shown in Figure 2, cantilever beam 2 comprises: main track magnetostrictive layer 5, piezoelectric layer 6 and negative wire magnetostrictive layer 7, wherein: main track magnetostrictive layer 5, piezoelectric layer 6 and negative wire magnetostrictive layer 7 link to each other successively.The upper surface of piezoelectric layer 6 is provided with one deck main track magnetostrictive layer 5, and present embodiment is selected the TbFe film for use, and the lower surface of piezoelectric layer 6 is provided with one deck negative wire magnetostrictive layer 7, and present embodiment is selected the SmFe film for use.Positive negative wire magnetostrictive layer is connected in series, and the polarised direction of piezoelectric layer 6 is its thickness direction.
The pole orientation of permanent magnet 3 is the length direction of cantilever beam 2, and the horizontal length direction that puts on the magnetic direction H of positive negative wire magnetostrictive layer and cantilever beam 2 is consistent.
Present embodiment bistable state beam 4 is to be made by micro girder construction, the length of micro girder construction is longer than the width of framework 1 internal pore, and micro girder construction is horizontal positioned in framework 1, and its two ends and framework 1 inner solid propping up together, micro girder construction generation flexing under responsive to axial force constitutes bistable state beam 4.
As shown in Figure 3, bistable state beam 4 structure lengths are longer than the width of framework 1 inside, be subjected under the responsive to axial force flexing to take place in framework 1 inside, and the stable equilibrium are positioned over framework 1 inside, and be first stable position A of bistable state beam 4 this moment.When ambient vibration acted on extraneous cross force on the bistable state beam 4 and increases to certain value, bistable state beam 4 moved downward another state that is stabilized in, and be second stable position B of bistable state beam 4 this moment.
The operation principle of present embodiment is: when this device is positioned in the ambient vibration, under certain vibration acceleration condition, bistable state beam 4 can switch between the first stable position A and the second stable position B mutually.When bistable state beam 4 when the first stable position A transfers the second stable position B to, permanent magnet 3 on the bistable state beam 4 and the distance between the cantilever beam 2 will reduce, the magnetic field that acts on main track magnetostrictive layer 5 and negative wire magnetostrictive layer 7 increases, under the effect in magnetic field, main track magnetostrictive layer 5 and negative wire magnetostrictive layer 7 are in cantilever beam 2 elongated lengthwise or shortening, and two-layer up and down elongation is shortened process always to carry out on the contrary synchronously, be 5 elongations of main track magnetostrictive layer, negative wire magnetostrictive layer 7 shortens mutually on the contrary because of magnetostriction.The length variations of main track magnetostrictive layer 5 and negative wire magnetostrictive layer 7 makes the not stiff end of cantilever beam 2 just crooked downward or upward, and shown in Figure 2 is that cantilever beam 2 is bent downwardly schematic diagram under the action of a magnetic field.Subsequently, because the vibration of external environment, bistable state beam 4 will switch to first stable position A from second stable position B, at this moment, the distance that permanent magnet 3 and cantilever beam are 2 increases, the magnetic field intensity that permanent magnet 3 acts on main track magnetostrictive layer 5 and negative wire magnetostrictive layer 7 weakens, characteristic according to giant magnetostrictive material, at this moment, main track magnetostrictive layer 5 and 7 elongations of negative wire magnetostrictive layer and shortening state will change, promptly original will shortening of extending, that originally shortens will extend, and this will make cantilever beam 2 return to initial position.When bistable state beam 4 switched to the second stable position B again, the magnetic field that permanent magnet 3 puts on main track magnetostrictive layer 5 and negative wire magnetostrictive layer 7 strengthened again, caused cantilever beam 2 bendings but at a time.Therefore, as long as the extraneous vibration acceleration enough provides bistable state beam 4 stable states conversions required critical force, cantilever beam 2 just can obtain enough bendings, and with the ambient vibration frequency-independent in the external world, thereby realized the bigger power output of acquisition under the low frequency environments.
In the present embodiment: at first permanent magnet 3 is adhered to the centre position of bistable state beam 4, make bistable state beam 4 be in first stable position; Secondly bistable state beam 4 is applied axis prestressing force greater than straight beam flexing critical force, flexing bistable state beam 4 two ends are fixed on the energy collecting device framework 1; Make an end of cantilever beam 2 prop up on energy collecting device framework 1 the unsettled setting of the other end admittedly then.
As shown in table 1, it is as shown in the table for the used size of the application request of present embodiment.
| Whole energy collecting device size (mm 2) | Bistable state beam size (long * wide * thick) (mm 3??) | The sagitta of bistable state beam (during stable state) (mm) | Bistable state beam and cantilever beam spacing (mm) | Permanent magnetic iron block size (long * thick) (mm 2) | The piezoelectric layer of cantilever beam (mm) | Positive negative wire magnetostrictive layer (mm) |
| ??1×1 | ??1×0.04×??0.03 | ??0.15 | ??0.2 | ??0.3×0.03 | ??0.02 | ??0.003 |
Table 11 * 1mm
2One group of design parameter of size energy collecting device
The present embodiment piezoelectric giant magnetostrictive combined wideband vibration energy collector can be exported stable power in the work frequency domain of a broad, compare with existing correlation technique, output power density can both improve one more than the order of magnitude in its working band and unit interval.
Claims (6)
1. piezoelectric giant magnetostrictive combined wideband vibration energy collector, comprise: framework, bistable state beam, cantilever beam and permanent magnet, wherein: the two ends of bistable state beam are fixed on the framework, permanent magnet is attached on the bistable state beam, one end of cantilever beam is fixed on the framework, the unsettled setting of the other end, it is characterized in that: described cantilever beam comprises: main track magnetostrictive layer, piezoelectric layer and negative wire magnetostrictive layer, wherein: main track magnetostrictive layer, piezoelectric layer and negative wire magnetostrictive layer link to each other successively.
2. piezoelectric giant magnetostrictive combined wideband vibration energy collector according to claim 1 is characterized in that, the polarised direction of described piezoelectric layer is its thickness direction.
3. piezoelectric giant magnetostrictive combined wideband vibration energy collector according to claim 1 is characterized in that, the thickness of described main track mangneto and negative wire magnetostrictive layer is 1 ~ 10 μ m.
4. piezoelectric giant magnetostrictive combined wideband vibration energy collector according to claim 1 is characterized in that, described bistable state beam deflection is arranged in the framework and framework is fixed at two ends.
5. according to claim 1 or 4 described piezoelectric giant magnetostrictive combined wideband vibration energy collectors, it is characterized in that described bistable state beam is that micro girder construction is made.
6. piezoelectric giant magnetostrictive combined wideband vibration energy collector according to claim 1 is characterized in that, the pole orientation of described permanent magnet is consistent with cantilever beam length direction.
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| CN102064736A (en) * | 2010-12-08 | 2011-05-18 | 重庆大学 | Composite micro wind turbine generator |
| CN102223107A (en) * | 2011-06-27 | 2011-10-19 | 重庆大学 | System for collecting wide-band low-frequency micro piezoelectric vibration energy |
| CN103296923A (en) * | 2013-06-04 | 2013-09-11 | 中国科学院上海硅酸盐研究所 | Magnet-free bistable piezoelectric transducer |
| CN103916047A (en) * | 2013-01-07 | 2014-07-09 | 北京嘉岳同乐极电子有限公司 | Piezoelectric vibration generating set |
| CN104025446A (en) * | 2012-01-12 | 2014-09-03 | 富士通株式会社 | Power generating apparatus |
| CN104536534A (en) * | 2015-01-19 | 2015-04-22 | 张文明 | Electronic device posture adjustment device based on bistable-state structure |
| CN106199462A (en) * | 2016-08-29 | 2016-12-07 | 南京理工大学 | A kind of magnetoelectric transducer sensing element reducing vibration noise |
| CN106972782A (en) * | 2017-04-22 | 2017-07-21 | 吉林大学 | A kind of piezoelectric beam with bistable characteristic and electric capacity combined bidirectional energy collector |
| CN108550692A (en) * | 2018-03-30 | 2018-09-18 | 湖北大学 | A kind of adjustable magneto-electric coupled composite material and preparation method of resonance mode |
| CN109639088A (en) * | 2019-01-16 | 2019-04-16 | 吕梁学院 | A kind of compound source energy collector that declines of electromagnetism-piezoelectricity-magnetostriction |
| CN110794345A (en) * | 2019-11-07 | 2020-02-14 | 青岛大学 | FM/FE/FM multiferroic heterojunction and magnetoelectric coupling sensor |
| CN112953303A (en) * | 2021-04-01 | 2021-06-11 | 西华师范大学 | Nonlinear rotation type broadband energy collector |
| CN113783470A (en) * | 2021-08-17 | 2021-12-10 | 青岛海月辉科技有限公司 | Magnetic field energy collector based on two-end fixing beam |
| CN114307768A (en) * | 2022-03-15 | 2022-04-12 | 杭州电子科技大学 | Thermoelectric coupling flexible oscillator and driving method thereof |
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| CN102064736A (en) * | 2010-12-08 | 2011-05-18 | 重庆大学 | Composite micro wind turbine generator |
| CN102064736B (en) * | 2010-12-08 | 2012-12-12 | 重庆大学 | Composite micro wind turbine generator |
| CN102223107A (en) * | 2011-06-27 | 2011-10-19 | 重庆大学 | System for collecting wide-band low-frequency micro piezoelectric vibration energy |
| CN102223107B (en) * | 2011-06-27 | 2013-05-15 | 重庆大学 | System for collecting wide-band low-frequency micro piezoelectric vibration energy |
| CN104025446A (en) * | 2012-01-12 | 2014-09-03 | 富士通株式会社 | Power generating apparatus |
| CN103916047A (en) * | 2013-01-07 | 2014-07-09 | 北京嘉岳同乐极电子有限公司 | Piezoelectric vibration generating set |
| CN103296923B (en) * | 2013-06-04 | 2016-01-06 | 中国科学院上海硅酸盐研究所 | Exempt from magnet bistable state PZT (piezoelectric transducer) |
| CN103296923A (en) * | 2013-06-04 | 2013-09-11 | 中国科学院上海硅酸盐研究所 | Magnet-free bistable piezoelectric transducer |
| CN104536534A (en) * | 2015-01-19 | 2015-04-22 | 张文明 | Electronic device posture adjustment device based on bistable-state structure |
| CN104536534B (en) * | 2015-01-19 | 2017-08-22 | 张文明 | Electronic equipment pose adjustment device based on bistable structure |
| CN106199462A (en) * | 2016-08-29 | 2016-12-07 | 南京理工大学 | A kind of magnetoelectric transducer sensing element reducing vibration noise |
| CN106972782B (en) * | 2017-04-22 | 2023-04-25 | 吉林大学 | Piezoelectric beam and capacitance combined bidirectional energy collector with bistable characteristic |
| CN106972782A (en) * | 2017-04-22 | 2017-07-21 | 吉林大学 | A kind of piezoelectric beam with bistable characteristic and electric capacity combined bidirectional energy collector |
| CN108550692A (en) * | 2018-03-30 | 2018-09-18 | 湖北大学 | A kind of adjustable magneto-electric coupled composite material and preparation method of resonance mode |
| CN109639088B (en) * | 2019-01-16 | 2021-03-23 | 吕梁学院 | Electromagnetic-piezoelectric-magnetostrictive composite micro-energy collector |
| CN109639088A (en) * | 2019-01-16 | 2019-04-16 | 吕梁学院 | A kind of compound source energy collector that declines of electromagnetism-piezoelectricity-magnetostriction |
| CN110794345A (en) * | 2019-11-07 | 2020-02-14 | 青岛大学 | FM/FE/FM multiferroic heterojunction and magnetoelectric coupling sensor |
| CN112953303A (en) * | 2021-04-01 | 2021-06-11 | 西华师范大学 | Nonlinear rotation type broadband energy collector |
| CN113783470A (en) * | 2021-08-17 | 2021-12-10 | 青岛海月辉科技有限公司 | Magnetic field energy collector based on two-end fixing beam |
| CN114307768A (en) * | 2022-03-15 | 2022-04-12 | 杭州电子科技大学 | Thermoelectric coupling flexible oscillator and driving method thereof |
| CN114307768B (en) * | 2022-03-15 | 2022-05-27 | 杭州电子科技大学 | Thermoelectric coupling flexible oscillator and driving method thereof |
| CN114646795A (en) * | 2022-03-28 | 2022-06-21 | 广东电网有限责任公司江门供电局 | Power distribution terminal hot plug module monitoring device based on frequency domain analysis |
| CN114646795B (en) * | 2022-03-28 | 2023-08-25 | 广东电网有限责任公司江门供电局 | Power distribution terminal hot plug module monitoring device based on frequency domain analysis |
| WO2023184948A1 (en) * | 2022-03-28 | 2023-10-05 | 广东电网有限责任公司江门供电局 | Frequency-domain-analysis-based monitoring apparatus for power distribution terminal hot-plugging module |
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