Micro wind turbine generator based on wind-induced vibration mechanism and piezoelectric effect

A wind power generator, piezoelectric effect technology, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve bridge Wind damage accidents, discomfort for drivers or passengers, fatigue of bridge structures, etc.

Inactive Publication Date: 2009-11-11
CHONGQING UNIV
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Problems solved by technology

The study found that the design of long-span bridges cannot only consider the static response under wind load, but also the dynamic response of the structure, that is, the structural v

Method used

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  • Micro wind turbine generator based on wind-induced vibration mechanism and piezoelectric effect
  • Micro wind turbine generator based on wind-induced vibration mechanism and piezoelectric effect
  • Micro wind turbine generator based on wind-induced vibration mechanism and piezoelectric effect

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Embodiment Construction

[0027] The typical structure of a micro-generator based on the wind-induced vibration mechanism and the piezoelectric effect includes a silicon substrate, a composite beam / membrane containing a piezoelectric layer and metal electrodes on the upper and lower surfaces of the piezoelectric layer, etc., where the composite beam / membrane may only contain a laminated Electrical layer (then the composite beam / membrane must contain another structural layer so that the piezoelectric layer is on one side of the beam / membrane neutral axis, as in the following Figure 1-8 The structure shown), may also include a multilayer piezoelectric layer (using a multilayer piezoelectric layer can adjust the internal impedance of the generator or improve the output characteristics of the generator), such as the following Figure 9 structure shown.

[0028] The following is a structure of this micro-generator, which uses a composite beam with a piezoelectric layer. The process flow is as follows:

[...

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Abstract

The invention provides a method of using the wind-induced vibration phenomenon of a micro structure to generate power and a micro generator based on wind-induced vibration mechanism and piezoelectric effect, wherein the micro generator comprises a silicon underlay, a composite beam/membrane comprising a piezoelectric layer and metal electrodes on the upper surface and the lower surface thereof, and the like. When the load of environmental wind causes the vibration of the composite beam/membrane structure comprising the piezoelectric layer, the vibration of the beam/membrane structure can cause the alternative change of the stress of the piezoelectric layer; due to the piezoelectric effect, the upper metal electrode and the lower electrode of the piezoelectric layer can generate an alternatively changed electric potential difference; and the electric potential difference can supply power for the load or a power accumulator. The composite beam/membrane structure comprising the piezoelectric layer can adopt a plurality of structure forms comprising a cantilever composite bema, a double-end fixedly supported composite beam, a multi-point fixedly supported composite part or a composite membrane which is partially and fixedly supported in the boundary. The micro wind turbine generator based on wind-induced vibration mechanism does not need a rotating mechanism, has a simple structure, is convenient to adopt silicon micro-processing technology to implement batch processing, has low cost, and is suitable for supplying power for wireless sensing network nodes, and the like.

Description

technical field [0001] The invention belongs to the field of micro-electro-mechanical systems (MEMS), in particular to MEMS micro-energy (Power MEMS) technology. Background technique [0002] The development of integrated circuits and MEMS technology has made it possible to construct wireless sensor networks with thousands of nodes. Wireless sensor networks have broad application prospects in the fields of environmental monitoring, large building health monitoring, public safety, and military affairs. , has aroused widespread attention at home and abroad. Due to the disadvantages of large battery size, limited life, and need for replacement, the application in long-life wireless sensor networks, wireless sensor networks set in hazardous environments, and wireless sensor networks with many nodes is limited. In addition, portable electronic products also have a huge demand for micro energy. MEMS micro energy, which converts environmental energy (such as vibration energy, the...

Claims

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Application Information

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IPC IPC(8): B81B7/02
Inventor 贺学锋温志渝廖海洋
Owner CHONGQING UNIV
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