Composite structure piezoelectric energy collector driven by cantilever

Abstract

The invention relates to a composite structure piezoelectric energy collector driven by a cantilever. The energy collector comprises a cantilever member and an output unit used for output of generated electric energy output, one end of the cantilever is a fixed end which is fixed on a base, the other end of the cantilever is a free end, a pair of piezoelectric energy converting units are respectively symmetrically arranged on the portions, near the fixed end of the cantilever member, of the upper surface and the lower surface of the cantilever member, and the piezoelectric energy converting units are driven by vibration of the cantilever member to generate electric energy.

Description

technical field [0001] The invention relates to the fields of piezoelectric energy collection and novel energy devices, and more specifically, relates to a piezoelectric energy harvester with a composite structure driven by a cantilever beam that can collect environmental vibration energy. Background technique [0002] Energy and the environment are the two most important themes that human beings pay attention to in the 21st century. With the development of the economy, fossil energy resources such as coal and oil are decreasing due to continuous consumption. Therefore, countries all over the world are vigorously developing various renewable energy sources, hoping to collect and convert energy that can be recycled in the environment. Piezoelectric energy harvester is a device that realizes this function. It uses the positive piezoelectric effect of piezoelectric materials to collect various vibration energies in the environment and convert them into electrical energy. The ...

AI Technical Summary

Problems solved by technology

However, the piezoelectric transducers with the existing cantilever beam structure have the defect of low energy density; because in the cantilever beam structure, the stress distribution inside the piezoelectric material is not uniform

The stress at the fixed end is the largest, while the stress at the free end is 0, which limits the performance of the piezoelectric material at the free end.

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