CN110912457B - Composite three-stable-state piezoelectric vibration energy collector - Google Patents
Composite three-stable-state piezoelectric vibration energy collector Download PDFInfo
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- 230000005389 magnetism Effects 0.000 claims description 14
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- 238000006243 chemical reaction Methods 0.000 description 3
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- H02N2/18—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing electrical output from mechanical input, e.g. generators
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Abstract
The invention discloses a composite tristable piezoelectric vibration energy collector, which comprises: the piezoelectric energy collector comprises a base, a first three-stable-state piezoelectric energy collector and a second three-stable-state piezoelectric energy collector; the first three-stable-state piezoelectric energy collector and the second three-stable-state piezoelectric energy collector are arranged in the base. The first piezoelectric cantilever beam and the second piezoelectric cantilever beam are fixedly installed in parallel, and the third piezoelectric cantilever beam, the first piezoelectric cantilever beam and the second piezoelectric cantilever beam are connected in series to form the composite three-stable-state piezoelectric vibration energy collector. The resonant frequency of the first piezoelectric cantilever beam and the second piezoelectric cantilever beam and the resonant frequency of the third piezoelectric cantilever beam are connected in series to form a broadband window. According to the composite three-stable state piezoelectric vibration energy collector, the first three-stable state piezoelectric energy collector and the second three-stable state piezoelectric energy collector are connected in series to form a composite three-stable state energy collecting structure, so that the composite three-stable state piezoelectric vibration energy collector disclosed by the invention has the characteristics of high energy collecting output capacity and wide working frequency band.
Description
Technical Field
The invention relates to the technical field of power generation, in particular to a composite tristable piezoelectric vibration energy collector.
Background
The piezoelectric vibration energy collector can collect vibration energy in the environment and convert the vibration energy into electric energy to supply power for the wireless sensor network node. Recently, the tristable piezoelectric vibration energy harvester is proved to have wider potential energy trap width and shallower potential energy trap depth, and the energy harvesting efficiency and the working frequency band can be effectively improved.
However, the presently developed tristable piezoelectric vibration energy harvester is a single degree of freedom system, typically consisting of a piezoelectric cantilever beam with a magnet at the end and two external magnets. The output performance of the single-degree-of-freedom three-stable-state piezoelectric vibration energy collector still depends seriously on the vibration intensity in the external environment; when the environment vibration intensity is large enough, the multistable vibration is excited to generate large conversion output; when the environmental vibration intensity is small, the multistable piezoelectric vibration energy collector performs small-amplitude monostable vibration in the potential energy trap, so that the output of the piezoelectric vibration energy collector is greatly reduced.
Disclosure of Invention
The invention aims to provide a composite tristable piezoelectric vibration energy collector to solve the problem that the output performance of the conventional tristable piezoelectric vibration energy collector is seriously dependent on the vibration intensity in an external environment, so that the energy collection output capability is low.
In order to achieve the purpose, the invention provides the following scheme:
a composite tristable piezoelectric vibration energy harvester comprising: the piezoelectric energy collector comprises a base, a first three-stable-state piezoelectric energy collector and a second three-stable-state piezoelectric energy collector; the first and second three-stable-state piezoelectric energy collectors are arranged in the base;
the base comprises a base, a left supporting plate and a right supporting plate; one end of the base is connected with the bottom of the left supporting plate; the base is vertical to the left supporting plate; the other end of the base is connected with the bottom of the right supporting plate; the base is vertical to the right supporting plate; the left supporting plate is opposite to and parallel to the right supporting plate;
the first tri-stable piezoelectric energy harvester comprises: the piezoelectric cantilever beam comprises a first piezoelectric cantilever beam, a second piezoelectric cantilever beam, a first magnet, a second magnet and a third magnet; one end of the first piezoelectric cantilever beam and one end of the second piezoelectric cantilever beam are both arranged on the left supporting plate; the first piezoelectric cantilever beam and the second piezoelectric cantilever beam are positioned at the same height; the other end of the first piezoelectric cantilever beam and the other end of the second piezoelectric cantilever beam are both connected with the first surface of the first magnet; the first surface of the second magnet and the first surface of the third magnet are both arranged on the right side supporting plate;
the second tri-stable piezoelectric energy harvester comprises: the third piezoelectric cantilever beam, the fourth magnet, the fifth magnet and the sixth magnet; one end of the third piezoelectric cantilever beam is arranged at the center of the first surface of the first magnet; the other end of the third piezoelectric cantilever beam is connected with the first surface of the fourth magnet; the first face of fifth magnet with the first face of sixth magnet all sets up on the left side backup pad.
Optionally, the first piezoelectric cantilever includes: the piezoelectric ceramic comprises a first piezoelectric ceramic, a second piezoelectric ceramic and a first metal substrate; the first piezoelectric ceramic is arranged on the upper surface of one end of the first metal substrate; the second piezoelectric ceramic is arranged on the lower surface of one end of the first metal substrate; the first piezoelectric ceramics and the second piezoelectric ceramics are opposite and parallel; the first piezoelectric ceramic and the second piezoelectric ceramic are equal in size and opposite in polarization direction.
Optionally, the second piezoelectric cantilever includes: a third piezoelectric ceramic, a fourth piezoelectric ceramic and a second metal substrate; the third piezoelectric ceramic is arranged on the upper surface of one end of the second metal substrate; the fourth piezoelectric ceramic is arranged on the lower surface of one end of the second metal substrate; the third piezoelectric ceramic and the fourth piezoelectric ceramic are right opposite and parallel; the third piezoelectric ceramic and the fourth piezoelectric ceramic are equal in size and opposite in polarization direction.
Optionally, the third piezoelectric cantilever includes: a fifth piezoelectric ceramic, a sixth piezoelectric ceramic, and a third metal substrate; the fifth piezoelectric ceramic is arranged on the upper surface of one end of the third metal substrate; the sixth piezoelectric ceramic is arranged on the lower surface of one end of the third metal substrate; the fifth piezoelectric ceramic is opposite to and parallel to the sixth piezoelectric ceramic; the fifth piezoelectric ceramic and the sixth piezoelectric ceramic have the same size and opposite polarization directions.
Optionally, the first piezoelectric cantilever and the second piezoelectric cantilever are symmetrically arranged about a central axis of the third piezoelectric cantilever; the first piezoelectric cantilever beam and the second piezoelectric cantilever beam have the same size, structure and resonant frequency; the third piezoelectric cantilever beam and the first piezoelectric cantilever beam are different in structure, size and resonant frequency.
Optionally, a plane passing through the center of the first magnet and parallel to the base is a first plane; the vertical distance between the second magnet and the first plane is a first vertical distance; the vertical distance between the third magnet and the first plane is a second vertical distance; the first vertical spacing is equal to the second vertical spacing; the first magnet, the second magnet and the third magnet are not in contact; the magnetism of the second surface of the first magnet, the magnetism of the second surface of the second magnet and the magnetism of the second surface of the third magnet are the same; the first magnet, the second magnet and the third magnet are all the same in structure, size and material.
Optionally, a plane passing through the center of the fourth magnet and parallel to the base is a second plane; the vertical distance between the fifth magnet and the second plane is a third vertical distance; the vertical distance between the sixth magnet and the second plane is a fourth vertical distance; the third vertical spacing is equal to the fourth vertical spacing; the fourth magnet, the fifth magnet and the sixth magnet are not in contact; the magnetism of the second surface of the fourth magnet, the magnetism of the second surface of the fifth magnet and the magnetism of the second surface of the sixth magnet are the same; the fourth magnet, the fifth magnet and the sixth magnet are all the same in structure, size and material.
Optionally, a plane passing through the center of the fourth magnet and perpendicular to the base is a third plane; the first and second piezoelectric cantilevers are symmetric about the third plane.
Optionally, the first magnet and the fourth magnet are different in size but are made of the same material.
Optionally, the first magnet and the fourth magnet are both rectangular parallelepiped.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses a composite tristable piezoelectric vibration energy collector, which comprises: the piezoelectric energy collector comprises a base, a first three-stable-state piezoelectric energy collector and a second three-stable-state piezoelectric energy collector; the first three-stable-state piezoelectric energy collector and the second three-stable-state piezoelectric energy collector are arranged in the base; the first three-stable-state piezoelectric energy collector comprises a first piezoelectric cantilever beam, a second piezoelectric cantilever beam, a first magnet, a second magnet and a third magnet; the second three-stable-state piezoelectric energy collector comprises a third piezoelectric cantilever beam, a fourth magnet, a fifth magnet and a sixth magnet. The resonant frequency of the first piezoelectric cantilever beam and the second piezoelectric cantilever beam and the resonant frequency of the third piezoelectric cantilever beam are connected in series to form a broadband window. The first piezoelectric cantilever beam and the second piezoelectric cantilever beam are fixedly installed in parallel, and the third piezoelectric cantilever beam, the first piezoelectric cantilever beam and the second piezoelectric cantilever beam are connected in series to form the composite three-stable-state piezoelectric vibration energy collector. According to the composite three-stable state piezoelectric vibration energy collector, the first three-stable state piezoelectric energy collector and the second three-stable state piezoelectric energy collector are connected in series to form a composite three-stable state energy collecting structure, so that the composite three-stable state piezoelectric vibration energy collector disclosed by the invention has the characteristics of high energy collecting output capacity and wide working frequency band.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a top view of a composite tristable piezoelectric vibration energy harvester provided by the present invention;
figure 2 is an elevational view of a composite tristable piezoelectric vibration energy harvester provided by the present invention.
Description of the symbols:
101 a first piezoelectric cantilever, 102 a second piezoelectric cantilever, 103 a first magnet, 104 a second magnet, 105 a third magnet, 201 a third piezoelectric cantilever, 202 a fourth magnet, 203 a fifth magnet, 204 a sixth magnet, 301 a left support plate, 302 a right support plate, 303 a base.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a composite tristable piezoelectric vibration energy collector to solve the problem that the output performance of the conventional tristable piezoelectric vibration energy collector is seriously dependent on the vibration intensity in an external environment, so that the energy collection output capability is low.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a top view of a composite tristable piezoelectric vibration energy harvester provided by the present invention. Figure 2 is an elevational view of a composite tristable piezoelectric vibration energy harvester provided by the present invention. As shown in fig. 1 and 2, a composite tristable piezoelectric vibration energy harvester includes: the piezoelectric energy collector comprises a base, a first three-stable-state piezoelectric energy collector and a second three-stable-state piezoelectric energy collector; the first and second tri-stable piezoelectric energy collectors are disposed within the base.
Specifically, the base includes a base 303, a left support plate 301, and a right support plate 302. One end of the base 303 is connected to the bottom of the left support plate 301. The base 303 is perpendicular to the left support plate 301. The other end of the base 303 is connected to the bottom of the right support plate 302. The base 303 is perpendicular to the right support plate 302. The left support plate 301 and the right support plate 302 are in direct parallel.
The first tri-stable piezoelectric energy harvester comprises: a first piezoelectric cantilever 101, a second piezoelectric cantilever 102, a first magnet 103, a second magnet 104, and a third magnet 105. One end of the first piezoelectric cantilever beam 101 and one end of the second piezoelectric cantilever beam 102 are both mounted on the left support plate 301. The first piezoelectric cantilever 101 and the second piezoelectric cantilever 102 are located at the same height. The other end of the first piezoelectric cantilever beam 101 and the other end of the second piezoelectric cantilever beam 102 are both connected to the first surface of the first magnet 103. The first surface of the second magnet 104 and the first surface of the third magnet 105 are both mounted on the right support plate 302.
The second tri-stable piezoelectric energy harvester comprises: a third piezoelectric cantilever 201, a fourth magnet 202, a fifth magnet 203, and a sixth magnet 204. One end of the third piezoelectric cantilever 201 is arranged at the center of the first surface of the first magnet 103; the other end of the third piezoelectric cantilever beam 201 is connected with the first surface of the fourth magnet 202; a first surface of the fifth magnet 203 and a first surface of the sixth magnet 204 are both provided on the left support plate 301.
Further, the first piezoelectric cantilever 101 includes: the piezoelectric ceramic comprises a first piezoelectric ceramic, a second piezoelectric ceramic and a first metal substrate. The first piezoelectric ceramic is arranged on the upper surface of one end of the first metal substrate; the second piezoelectric ceramic is arranged on the lower surface of one end of the first metal substrate; the first piezoelectric ceramics and the second piezoelectric ceramics are opposite and parallel; the first piezoelectric ceramic and the second piezoelectric ceramic are equal in size and opposite in polarization direction.
The second piezoelectric cantilever 102 includes: a third piezoelectric ceramic, a fourth piezoelectric ceramic and a second metal substrate. The third piezoelectric ceramic is arranged on the upper surface of one end of the second metal substrate; the fourth piezoelectric ceramic is arranged on the lower surface of one end of the second metal substrate; the third piezoelectric ceramic and the fourth piezoelectric ceramic are right opposite and parallel; the third piezoelectric ceramic and the fourth piezoelectric ceramic are equal in size and opposite in polarization direction.
The third piezoelectric cantilever 201 includes: a fifth piezoelectric ceramic, a sixth piezoelectric ceramic, and a third metal substrate; the fifth piezoelectric ceramic is arranged on the upper surface of one end of the third metal substrate; the sixth piezoelectric ceramic is arranged on the lower surface of one end of the third metal substrate; the fifth piezoelectric ceramic is opposite to and parallel to the sixth piezoelectric ceramic; the fifth piezoelectric ceramic and the sixth piezoelectric ceramic have the same size and opposite polarization directions.
The first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 are symmetrically arranged around a central axis of the third piezoelectric cantilever beam 201. The distance between the central axis of the first piezoelectric cantilever beam 101 and the central axis of the second piezoelectric cantilever beam 102 is 2 y. The first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 have the same size, structure and resonant frequency; the third piezoelectric cantilever 201 and the first piezoelectric cantilever 101 have different structures, sizes and resonant frequencies.
The plane passing through the center of the first magnet 103 and parallel to the base 303 is a first plane; the vertical distance between the second magnet 104 and the first plane is a first vertical distance; the vertical distance between the third magnet 105 and the first plane is a second vertical distance; the first vertical spacing is equal to the second vertical spacing. The center of the second magnet 104 is opposite to the center of the third magnet 105 with a distance z1. The first magnet 103, the second magnet 104, and the third magnet 105 are not in contact with each other. The second surface of the first magnet 103, the second surface of the second magnet 104, and the second surface of the third magnet 105 are all identical in magnetism and are in a mutually exclusive relationship. The horizontal distance between the second surface of the first magnet 103 and the second surface of the second magnet 104 is x1(ii) a The resonant frequency of the first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 can be adjusted by x1Is implemented by the size of (a). The first magnet 103, the second magnet 104, and the third magnet 105 are identical in structure, size, and material.
The plane passing through the center of the fourth magnet 202 and parallel to the base 303 is a second plane; the vertical distance between the fifth magnet 203 and the second plane is a third vertical distance; the vertical distance between the sixth magnet 204 and the second plane is a fourth vertical distance; the third vertical spacing is equal to the fourth vertical spacing. The center of the fifth magnet 203 is opposite to the center of the sixth magnet 204, and the distance is z2. The fourth magnet 202, the fifth magnet 203, and the sixth magnet 204 are not in contact with each other. The second surface of the fourth magnet 202, the second surface of the fifth magnet 203, and the second surface of the sixth magnet 204 are all identical in magnetism and are in a mutually exclusive relationship. The horizontal distance between the second surface of the fourth magnet 202 and the second surface of the fifth magnet 203 is x2. The resonant frequency of the third piezoelectric cantilever 201 can be adjusted by x2Is implemented by the size of (a). A junction of the fourth magnet 202, the fifth magnet 203, and the sixth magnet 204The structure, the size and the material are the same.
The first magnet 103, the second magnet 104, the third magnet 105, the fourth magnet 202, the fifth magnet 203, and the sixth magnet 204 are all rectangular parallelepiped, and a first surface and a second surface of each magnet are opposite to each other.
A plane passing through the center of the fourth magnet 202 and perpendicular to the base 303 is a third plane; the first piezoelectric cantilever 101 and the second piezoelectric cantilever 102 are symmetrical about the third plane; the distance between the third plane and the central axis of the first piezoelectric cantilever 101 is y.
The first magnet 103 and the fourth magnet 202 are different in size but are made of the same material.
The resonant frequency of the first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 and the resonant frequency of the third piezoelectric cantilever beam 201 are connected in series to form a broadband window. The first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 are fixedly installed in parallel, and the third piezoelectric cantilever beam 201, the first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 are connected in series to form the composite three-stable-state piezoelectric vibration energy harvester. The parallel connection of the invention means that: one end of each of the first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 is fixed on the left supporting plate surface of the base, the other end of each of the first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 is connected with the magnet 103, and the first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 are structurally connected in parallel; the series connection of the invention means that: one end of the third piezoelectric cantilever 103 is fixed at the center of the magnet 103, and the other end is a free end, and the third piezoelectric cantilever is structurally connected in series with the first piezoelectric cantilever 101 and the second piezoelectric cantilever 102.
When the base is excited by the vibration of the external environment, the first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 generate bending vibration on the vertical plane, so that piezoelectric ceramics generate bending deformation, induced charges are generated on the surfaces of the first piezoelectric cantilever beam and the second piezoelectric cantilever beam, and a formed current is output; meanwhile, the bending vibration generated by the first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102 in the vertical plane causes the third piezoelectric cantilever beam 103 to generate bending vibration in the vertical plane, so that the third piezoelectric cantilever beam 103 also generates induced charges and outputs the induced charges to form current, thereby achieving the purpose of converting mechanical vibration energy into electric energy.
According to the invention, the first three-stable-state piezoelectric energy collector and the second three-stable-state piezoelectric energy collector are connected in series to form the composite three-stable-state piezoelectric vibration energy collector, so that the first piezoelectric cantilever beam 101, the second piezoelectric cantilever beam 102 and the third piezoelectric cantilever beam 201 can simultaneously participate in bending deformation under vibration excitation to realize the collection and conversion of vibration energy, generate larger output electric energy, and adjust x to realize the collection and conversion of vibration energy1And z1Changing the repulsive force of the nonlinear magnetic field applied to the first piezoelectric cantilever beam 101 and the second piezoelectric cantilever beam 102; and adjusting x2And z2And the repulsive force of the nonlinear magnetic field applied to the third piezoelectric cantilever beam 201 is changed, so that the composite tristable piezoelectric vibration energy collector disclosed by the invention has the characteristics of wide frequency band and high efficiency in collection and output.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A composite tristable piezoelectric vibration energy harvester, comprising: the piezoelectric energy collector comprises a base, a first three-stable-state piezoelectric energy collector and a second three-stable-state piezoelectric energy collector; the first and second three-stable-state piezoelectric energy collectors are arranged in the base;
the base comprises a base, a left supporting plate and a right supporting plate; one end of the base is connected with the bottom of the left supporting plate; the base is vertical to the left supporting plate; the other end of the base is connected with the bottom of the right supporting plate; the base is vertical to the right supporting plate; the left supporting plate is opposite to and parallel to the right supporting plate;
the first tri-stable piezoelectric energy harvester comprises: the piezoelectric cantilever beam comprises a first piezoelectric cantilever beam, a second piezoelectric cantilever beam, a first magnet, a second magnet and a third magnet; one end of the first piezoelectric cantilever beam and one end of the second piezoelectric cantilever beam are both arranged on the left supporting plate; the first piezoelectric cantilever beam and the second piezoelectric cantilever beam are positioned at the same height; the other end of the first piezoelectric cantilever beam and the other end of the second piezoelectric cantilever beam are both connected with the first surface of the first magnet; the first surface of the second magnet and the first surface of the third magnet are both arranged on the right side supporting plate;
the second tri-stable piezoelectric energy harvester comprises: the third piezoelectric cantilever beam, the fourth magnet, the fifth magnet and the sixth magnet; one end of the third piezoelectric cantilever beam is arranged at the center of the first surface of the first magnet; the other end of the third piezoelectric cantilever beam is connected with the first surface of the fourth magnet; the first surface of the fifth magnet and the first surface of the sixth magnet are both arranged on the left supporting plate;
the first piezoelectric cantilever beam and the second piezoelectric cantilever beam are symmetrically arranged around the central axis of the third piezoelectric cantilever beam.
2. The composite tristable piezoelectric vibration energy harvester of claim 1 wherein the first piezoelectric cantilever beam comprises: the piezoelectric ceramic comprises a first piezoelectric ceramic, a second piezoelectric ceramic and a first metal substrate; the first piezoelectric ceramic is arranged on the upper surface of one end of the first metal substrate; the second piezoelectric ceramic is arranged on the lower surface of one end of the first metal substrate; the first piezoelectric ceramics and the second piezoelectric ceramics are opposite and parallel; the first piezoelectric ceramic and the second piezoelectric ceramic are equal in size and opposite in polarization direction.
3. The composite tristable piezoelectric vibration energy harvester of claim 1 wherein the second piezoelectric cantilever beam comprises: a third piezoelectric ceramic, a fourth piezoelectric ceramic and a second metal substrate; the third piezoelectric ceramic is arranged on the upper surface of one end of the second metal substrate; the fourth piezoelectric ceramic is arranged on the lower surface of one end of the second metal substrate; the third piezoelectric ceramic and the fourth piezoelectric ceramic are right opposite and parallel; the third piezoelectric ceramic and the fourth piezoelectric ceramic are equal in size and opposite in polarization direction.
4. The composite tristable piezoelectric vibration energy harvester of claim 1 wherein the third piezoelectric cantilever beam comprises: a fifth piezoelectric ceramic, a sixth piezoelectric ceramic, and a third metal substrate; the fifth piezoelectric ceramic is arranged on the upper surface of one end of the third metal substrate; the sixth piezoelectric ceramic is arranged on the lower surface of one end of the third metal substrate; the fifth piezoelectric ceramic is opposite to and parallel to the sixth piezoelectric ceramic; the fifth piezoelectric ceramic and the sixth piezoelectric ceramic have the same size and opposite polarization directions.
5. The composite tristable piezoelectric vibration energy harvester of claim 1 wherein the first piezoelectric cantilever beam and the second piezoelectric cantilever beam are all the same in size, structure and resonant frequency; the third piezoelectric cantilever beam and the first piezoelectric cantilever beam are different in structure, size and resonant frequency.
6. The composite tristable piezoelectric vibration energy harvester of claim 1 wherein the plane passing through the center of the first magnet and parallel to the base is a first plane; the vertical distance between the second magnet and the first plane is a first vertical distance; the vertical distance between the third magnet and the first plane is a second vertical distance; the first vertical spacing is equal to the second vertical spacing; the first magnet, the second magnet and the third magnet are not in contact; the magnetism of the second surface of the first magnet, the magnetism of the second surface of the second magnet and the magnetism of the second surface of the third magnet are the same; the first magnet, the second magnet and the third magnet are all the same in structure, size and material.
7. The composite tristable piezoelectric vibration energy harvester of claim 1 wherein the plane passing through the center of the fourth magnet and parallel to the base is a second plane; the vertical distance between the fifth magnet and the second plane is a third vertical distance; the vertical distance between the sixth magnet and the second plane is a fourth vertical distance; the third vertical spacing is equal to the fourth vertical spacing; the fourth magnet, the fifth magnet and the sixth magnet are not in contact; the magnetism of the second surface of the fourth magnet, the magnetism of the second surface of the fifth magnet and the magnetism of the second surface of the sixth magnet are the same; the fourth magnet, the fifth magnet and the sixth magnet are all the same in structure, size and material.
8. The composite tristable piezoelectric vibration energy harvester of claim 1 wherein the plane passing through the center of the fourth magnet and perpendicular to the base is a third plane; the first and second piezoelectric cantilevers are symmetric about the third plane.
9. The composite tristable piezoelectric vibration energy harvester of claim 1 wherein the first magnet and the fourth magnet are of different dimensions but of the same material.
10. The composite tristable piezoelectric vibration energy harvester of claim 1 wherein the first magnet and the fourth magnet are each cuboid.
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| CN111917332B (en) * | 2020-08-24 | 2021-06-22 | 上海大学 | Compound vibration energy collector of many piezoelectric beams clan |
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| CN113241970B (en) * | 2021-05-24 | 2022-05-24 | 燕山大学 | Multistable speed amplification and frequency boost combined vibration energy collector and collecting method thereof |
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