CN110518833B - Regular quadrangular multi-direction piezoelectric energy collector - Google Patents
Regular quadrangular multi-direction piezoelectric energy collector Download PDFInfo
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- CN110518833B CN110518833B CN201910832145.0A CN201910832145A CN110518833B CN 110518833 B CN110518833 B CN 110518833B CN 201910832145 A CN201910832145 A CN 201910832145A CN 110518833 B CN110518833 B CN 110518833B
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- 230000010287 polarization Effects 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 229910000906 Bronze Inorganic materials 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- 239000010974 bronze Substances 0.000 claims description 3
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
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
- H02N2/186—Vibration harvesters
- H02N2/188—Vibration harvesters adapted for resonant operation
Abstract
The invention discloses a regular quadrangular multi-direction piezoelectric energy collector which comprises a cantilever beam, a fixed end and a mass block, wherein one end of the cantilever beam is connected with the mass block, the other end of the cantilever beam is set to be the fixed end, and a first piezoelectric layer, a second piezoelectric layer, a third piezoelectric layer and a fourth piezoelectric layer are sequentially arranged on one end, close to the fixed end, of the side surface of the cantilever beam; the normal directions of the first piezoelectric layer and the third piezoelectric layer are the same as the Y-axis direction, and the normal directions of the second piezoelectric layer and the fourth piezoelectric layer are the same as the Z-axis direction; the invention improves the energy conversion efficiency of the piezoelectric energy collector. The structure is simple, the manufacturing cost is low, the miniaturization and the integration of products are easily realized through the MEMS technology, and the output current of the energy collector can be improved through the mode of connecting the piezoelectric layers in parallel.
Description
Technical Field
The invention relates to a regular quadrangular multidirectional piezoelectric energy collector, and belongs to the technical field of piezoelectric energy collection.
Background
Vibrational energy is widely present in nature and if it can be extracted from the environment, long-term power supply of miniature low-power-consumption devices can be realized by converting and storing the energy. In order to fully utilize the vibration energy in the environment, piezoelectric energy harvesting techniques have been proposed.
When the piezoelectric material is deformed by an external force, a polarization phenomenon occurs, and two charges with opposite positive and negative polarities appear on two opposite surfaces of the piezoelectric material. The piezoelectric energy collection technology is to convert the vibration mechanical energy existing in the external environment into electric energy for storage and utilization by utilizing the piezoelectric effect of the piezoelectric material. The piezoelectric energy collector has the characteristic of simple structure, and is easy to integrate and miniaturize.
However, most of the existing piezoelectric energy collectors have the disadvantages of being able to effectively convert energy in a single vibration direction and having low energy conversion efficiency in other directions, such as a piezoelectric energy collector and a manufacturing method thereof (chinese patent publication No. CN 105932906A). The vibration directions of the vibration energy existing in the outside are not all fixed and unchanged, and the energy conversion efficiency of the energy collector is greatly influenced by only converting the vibration energy in a single direction.
Most of the existing multidirectional piezoelectric energy collector structures realize the collection of vibration energy in multiple directions by combining and superposing a plurality of cantilever beams in arrays at different positions, such as a six-dimensional piezoelectric energy collector (chinese patent publication No. CN 207603482U), a spatial multi-modal array type cantilever beam piezoelectric energy collection device (chinese patent publication No. CN 106856380A), and the like. However, this approach undoubtedly increases the spatial complexity of the device structure, and makes miniaturization and integration of the energy collector difficult.
Disclosure of Invention
The invention aims to provide a regular quadrangular prism-shaped multidirectional piezoelectric energy collector, which aims to overcome the defects that the multidirectional piezoelectric energy collector structure in the prior art is high in space complexity and difficult to miniaturize and integrate the energy collector.
A regular quadrangular multi-direction piezoelectric energy collector comprises a cantilever beam, a fixed end and a mass block, wherein one end of the cantilever beam is connected with the mass block, the other end of the cantilever beam is set as the fixed end, and a first piezoelectric layer, a second piezoelectric layer, a third piezoelectric layer and a fourth piezoelectric layer are sequentially arranged on the side surface of the cantilever beam and at one end close to the fixed end; the normal directions of the first piezoelectric layer and the third piezoelectric layer are the same as the Y-axis direction, and the normal directions of the second piezoelectric layer and the fourth piezoelectric layer are the same as the Z-axis direction.
Preferably, when the cantilever beam is excited by vibration in the Y-axis direction, the first piezoelectric layer and the third piezoelectric layer generate polarization charges on the surfaces; when the piezoelectric ceramic is excited by vibration in the Z-axis direction, polarization charges are generated on the surfaces of the second piezoelectric layer and the fourth piezoelectric layer.
Preferably, the cantilever beam is in a regular quadrangular prism shape, the beam width is equal to the beam height, and the adopted material is phosphor bronze.
Preferably, the first piezoelectric layer and the third piezoelectric layer are polarized in the same direction, and the second piezoelectric layer and the fourth piezoelectric layer are polarized in the same direction.
Preferably, the first piezoelectric layer, the second piezoelectric layer, the third piezoelectric layer and the fourth piezoelectric layer are the same in length, 0.3mm in thickness and made of PZT-5H.
Preferably, the lengths of the first, second, third and fourth piezoelectric layers are not less than one third of the length of the cantilever beam.
Preferably, the mass block is cubic and is made of metallic nickel.
Preferably, the side length of the mass is greater than the side length of the cross section of the cantilever beam.
Compared with the prior art, the invention has the following beneficial effects:
1. the cantilever beam of the energy collector is of a regular quadrangular prism structure, and can absorb vibration energy in the motion directions which are mutually vertical under the same resonance frequency, so that the energy conversion efficiency of the piezoelectric energy collector is improved.
2. Compared with the existing multidirectional piezoelectric energy collector, the energy collector has the advantages of simple structure and low manufacturing cost, and is easy to realize the miniaturization and integration of products through an MEMS (micro-electromechanical systems) process.
3. Compared with the existing multidirectional piezoelectric energy collector, the energy collector can be provided with four piezoelectric layers on a single cantilever beam, and the output current of the energy collector can be improved in a mode of connecting the piezoelectric layers in parallel.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view of the cantilever of the present invention;
figure 3 is a side view of the structure of the present invention.
In the figure: 1-cantilever beam, 2-fixed end, 3-mass block, 4-first piezoelectric layer, 5-second piezoelectric layer, 6-third piezoelectric layer, 7-fourth piezoelectric layer.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-3, a regular quadrangular multi-directional piezoelectric energy collector is disclosed, which comprises the following parts: cantilever 1, stiff end 2, quality piece 3, first piezoelectric layer 4, second piezoelectric layer 5, third piezoelectric layer 6, fourth piezoelectric layer 7 are constituteed. The cantilever beam 1 is a regular quadrangular metal block, and four side surfaces of the metal block are sequentially adhered with a first piezoelectric layer 4, a second piezoelectric layer 5, a third piezoelectric layer 6 and a fourth piezoelectric layer 7. Wherein the first piezoelectric layer 4 is opposite to the third piezoelectric layer 6 and its normal direction is the same as the Y-axis; the second piezoelectric layer 5 is opposite to the fourth piezoelectric layer 7 and its normal direction is the same as the Z-axis. One end of the cantilever beam 1 is a mass block 3, the other end is a fixed end 2, and the piezoelectric layer attached to the side surface of the cantilever beam is abutted against the fixed end 2.
The areas where the first piezoelectric layer 4, the second piezoelectric layer 5, the third piezoelectric layer 6 and the fourth piezoelectric layer 7 are attached are rectangular, the width of the areas is the same as the width of the cantilever beam 1, the length of the areas is not less than one third of the length of the cantilever beam 1, the first piezoelectric layer 4, the second piezoelectric layer 5, the third piezoelectric layer 6 and the fourth piezoelectric layer 7 are sequentially arranged on the surface of the cantilever beam 1 anticlockwise, and the areas are close to one end of the fixed end 2 and are 0.3mm thick. The cantilever beam 1 is made of phosphor bronze with good ductility. The mass block 3 is made of metal nickel and is used for reducing the resonance frequency and increasing the displacement of the cantilever beam 1. The materials of the first piezoelectric layer 4, the second piezoelectric layer 5, the third piezoelectric layer 6 and the fourth piezoelectric layer 7 are PZT-5H, wherein the polarization directions of the first piezoelectric layer 4 and the third piezoelectric layer 6 are the same, and the polarization directions of the second piezoelectric layer 5 and the fourth piezoelectric layer 7 are the same.
The working principle is as follows: the structure of the cantilever beam 1 adopts a regular quadrangular prism structure, so that the height and the width of the cantilever beam 1 are equal, and the piezoelectric layers are adhered to four side surfaces of the cantilever beam 1. When the cantilever beam 1 is excited by vibration from the Y-axis direction, the first piezoelectric layer 4 and the third piezoelectric layer 6 generate a positive piezoelectric effect, and polarization charges are generated on the left and right surfaces of the piezoelectric layers; when the cantilever beam 1 receives vibration excitation from the Z-axis direction, the second piezoelectric layer 5 and the fourth piezoelectric layer 7 generate a positive piezoelectric effect, and polarization charges are generated on the upper and lower surfaces of the piezoelectric layers. The energy collector can absorb vibration energy from Y-axis and Z-axis directions under the same resonant frequency, and the piezoelectric sheets in the two directions are mutually independent when working, so that the piezoelectric layer with the Y-axis normal direction and the piezoelectric layer with the Z-axis normal direction can be connected in parallel, and the output current of the piezoelectric energy collector is improved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (4)
1. A regular quadrangular multi-directional piezoelectric energy collector is characterized by comprising a cantilever beam (1), a fixed end (2) and a mass block (3), wherein one end of the cantilever beam (1) is connected with the mass block (3), the other end of the cantilever beam is set to be the fixed end (2), and a first piezoelectric layer (4), a second piezoelectric layer (5), a third piezoelectric layer (6) and a fourth piezoelectric layer (7) are sequentially arranged on one side surface of the cantilever beam (1) and close to the fixed end (2); the normal directions of the first piezoelectric layer (4) and the third piezoelectric layer (6) are the same as the Y-axis direction, and the normal directions of the second piezoelectric layer (5) and the fourth piezoelectric layer (7) are the same as the Z-axis direction;
when the cantilever beam (1) is excited by vibration in the Y-axis direction, polarization charges are generated on the surfaces of the first piezoelectric layer (4) and the third piezoelectric layer (6); when the piezoelectric ceramic is excited by vibration in the Z-axis direction, polarization charges are generated on the surfaces of the second piezoelectric layer (5) and the fourth piezoelectric layer (7);
the cantilever beam (1) is in a regular quadrangular prism shape, the beam width is equal to the beam height, and the adopted material is phosphor bronze;
the polarization directions of the first piezoelectric layer (4) and the third piezoelectric layer (6) are consistent, and the polarization directions of the second piezoelectric layer (5) and the fourth piezoelectric layer (7) are consistent;
the first piezoelectric layer (4), the second piezoelectric layer (5), the third piezoelectric layer (6) and the fourth piezoelectric layer (7) are the same in length, 0.3mm in thickness and made of PZT-5H.
2. The regular quadrangular prism-shaped multidirectional piezoelectric energy harvester according to claim 1, wherein the lengths of the first piezoelectric layer (4), the second piezoelectric layer (5), the third piezoelectric layer (6) and the fourth piezoelectric layer (7) are not less than one third of the length of the cantilever beam (1).
3. The regular quadrangular multi-directional piezoelectric energy harvester according to claim 1, wherein the mass block (3) is cubic and made of nickel metal.
4. A regular quadrangular prism-shaped multidirectional piezoelectric energy harvester according to claim 1, wherein the side length of the mass block (3) is larger than the side length of the cross section of the cantilever beam (1).
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739109A (en) * | 2012-07-09 | 2012-10-17 | 南京航空航天大学 | Single-pendulum piezoelectric generator |
| CN102868315A (en) * | 2012-10-12 | 2013-01-09 | 哈尔滨工业大学 | Paster-type bending vibration composite dual-feet ultrasound motor oscillator |
| CN203645575U (en) * | 2013-10-11 | 2014-06-11 | 浙江工商大学 | Cantilever beam piezoelectric motor having energy acquisition function |
| CN104184367A (en) * | 2014-08-01 | 2014-12-03 | 南京航空航天大学 | Cylindrical multidirectional stacked type piezoelectric energy acquisition apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9818925B2 (en) * | 2012-06-14 | 2017-11-14 | Canon Kabushiki Kaisha | Vibrating body, method of manufacturing the same and vibration type drive device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739109A (en) * | 2012-07-09 | 2012-10-17 | 南京航空航天大学 | Single-pendulum piezoelectric generator |
| CN102868315A (en) * | 2012-10-12 | 2013-01-09 | 哈尔滨工业大学 | Paster-type bending vibration composite dual-feet ultrasound motor oscillator |
| CN203645575U (en) * | 2013-10-11 | 2014-06-11 | 浙江工商大学 | Cantilever beam piezoelectric motor having energy acquisition function |
| CN104184367A (en) * | 2014-08-01 | 2014-12-03 | 南京航空航天大学 | Cylindrical multidirectional stacked type piezoelectric energy acquisition apparatus |
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Application publication date: 20191129 Assignee: Nanjing Ningqixing Information Technology Co.,Ltd. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2023980046580 Denomination of invention: A Quadrangular Multi directional Piezoelectric Energy Collector Granted publication date: 20210928 License type: Common License Record date: 20231113 Application publication date: 20191129 Assignee: Nanjing Kecheng Zhijia Smart Technology Co.,Ltd. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2023980046578 Denomination of invention: A Quadrangular Multi directional Piezoelectric Energy Collector Granted publication date: 20210928 License type: Common License Record date: 20231113 Application publication date: 20191129 Assignee: Nanjing Bodexin Information Technology Co.,Ltd. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2023980046576 Denomination of invention: A Quadrangular Multi directional Piezoelectric Energy Collector Granted publication date: 20210928 License type: Common License Record date: 20231113 |
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Application publication date: 20191129 Assignee: NANJING YUANGAN MICROELECTRONIC CO.,LTD. Assignor: NANJING University OF POSTS AND TELECOMMUNICATIONS Contract record no.: X2023980048637 Denomination of invention: A Quadrangular Multi directional Piezoelectric Energy Collector Granted publication date: 20210928 License type: Common License Record date: 20231201 |