Shallow potential well five-stable switchable nonlinear broadband vibration energy harvester and its application

A vibration energy harvesting and switching technology, applied in generators/motors, piezoelectric/electrostrictive or magnetostrictive motors, electrical components, etc., can solve the problem of low power density, single structure mode, ineffective small to improve the output power, increase the resonance bandwidth, improve the utilization rate of magnetic energy and output power

Inactive Publication Date: 2017-10-31
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the shortcomings of the existing broadband nonlinear piezoelectric vibration energy harvester, which has a single structural mode, low power density and inability to effectively miniaturize, and further improve the output effect of the harvester under tiny excitation, the present invention provides a shallow po

Method used

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  • Shallow potential well five-stable switchable nonlinear broadband vibration energy harvester and its application
  • Shallow potential well five-stable switchable nonlinear broadband vibration energy harvester and its application
  • Shallow potential well five-stable switchable nonlinear broadband vibration energy harvester and its application

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Embodiment 1

[0030] In order to overcome the shortcomings of low power density and ineffective miniaturization of the existing broadband nonlinear piezoelectric vibration energy harvester, and further improve the output effect of the harvester under tiny excitation, this embodiment provides a shallow potential well five-stable State-of-the-art nonlinear broadband vibration energy harvester. Such as Figure 1-2 As shown, the shallow potential well five-stable non-linear broadband vibration energy harvester includes a shell 1 and a piezoelectric cantilever 2 (according to experimental needs, the piezoelectric sheets of the piezoelectric cantilever are partially separated, and can also be maintain the integrity of all piezoelectric sheets; the schematic structure of the piezoelectric cantilever beam is shown in the figure), two stoppers 5, two NdFeB permanent magnets I3, two NdFeB permanent magnets II4; The piezoelectric cantilever 2 has a length of 90 mm, a width of 15 mm, and a thickness o...

Embodiment 2

[0035] The optimal excitation environments applicable to vibration energy harvesters of different steady-state types are different. Although the shallow potential well five steady-state nonlinear broadband vibration energy harvesters described in the above-mentioned embodiment one can be weak in most cases The equipment in the excitation environment provides stable energy input, but since the multi-stable system is more likely to be trapped in a small-amplitude well under some random excitation types, the shallow potential well pentastable nonlinear broadband vibration energy described in Embodiment 1 The output performance of a harvester in these random excitation environments may be worse than that of a monostable harvester with a stiffness "softening" effect. In order to solve the problem that a single steady-state type of vibration energy harvester will not be able to meet the actual needs of engineering with complex and changeable excitation conditions in practical applica...

Embodiment 3

[0037] Compared with Example 2, in order to further control the position accuracy of the collision position b, as Figure 8 As shown, on the basis of the shallow potential well five-stable non-linear broadband vibration energy harvester described in Embodiment 1, micrometer ejector rod structures 7 (such as Figure 9 As shown, the traditional micrometer includes a screw jack part d and a frame part c, the micrometer jack structure 7 is the screw jack part of the micrometer), and the micrometer jack structure 7 includes a screw rod 7-1, a fixed sleeve 7-2, the movable sleeve 7-3, the fixed sleeve 7-2 and the movable sleeve 7-3 are provided with scales, one end of the screw rod 7-1 is coaxially fixed with the movable sleeve 7-3, and the fixed sleeve 7 -2 is coaxially socketed on the screw rod 7-1 through threads, and one end of the movable sleeve 7-3 is coaxially and rotatably socketed on the fixed sleeve 7-2, and the fixed sleeve 7-2 is fixed to the shell 1; By screwing the mo...

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Abstract

The invention discloses a shallow-potential-well five-steady state switchable type nonlinear broadband vibration energy harvester and an application thereof. One end of a piezoelectric cantilever beam is fastened to a housing; two permanent magnets I are arranged at the other end of the piezoelectric cantilever beam; the two permanent magnets I are symmetrically fixed on two side surfaces of the neutral surface of the piezoelectric cantilever beam; unlike poles of the two permanent magnets I are opposite; polarization directions of the two permanent magnets I are both perpendicular to the surface of the piezoelectric cantilever beam; two permanent magnets II are symmetrically fixed on the inner surface of the housing relative to the neutral surface of the piezoelectric cantilever beam; unlike poles of the two permanent magnets II are opposite; polarization directions of the two permanent magnets II are both perpendicular to the surface of the piezoelectric cantilever beam; the unlike poles of the two permanent magnets II and the two permanent magnets I are opposite; and two stoppers are symmetrically arranged on two sides of the neutral surface of the piezoelectric cantilever beam and fixed to the housing. According to the energy harvester, a five-steady state design is adopted, the utilization rate of magnetic field is higher, the miniaturization potential is relatively high, and steady state types can be switched while the magnitude order of excitation required by working is reduced to meet the needs of complicated excitation environments.

Description

technical field [0001] The invention belongs to the technical field of energy collection, in particular to a shallow potential well five-stable non-linear broadband vibration energy collector. Background technique [0002] At present, most of the known broadband nonlinear piezoelectric vibration energy harvesters use piezoelectric bimorph or piezoelectric single crystal cantilever beams with external magnetic force to form a nonlinear system restoring force to obtain a wider vibration frequency range and higher output. Voltage. Among them, the adjustment of the nonlinear restoring force of the system can only be realized by changing the size and distribution position of the magnet. According to the number of stable states formed by the vibrator of the harvester, the proposed broadband nonlinear piezoelectric vibration energy harvesters can be divided into three types: monostable, bistable and tristable. Due to the complexity and intrinsic nonlinearity of the magnetic force...

Claims

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Application Information

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IPC IPC(8): H02N2/18
CPCH02N2/183
Inventor 张琪昌王辰王炜
Owner TIANJIN UNIV
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