Cantilever mechanism for piezoelectric power generation

Abstract

The invention relates to a cantilever mechanism for piezoelectric power generation. The cantilever mechanism comprises a base (1), an elastic substrate (2), a piezoelectric material thin sheet (3), mass blocks (4) and a wire, wherein one end of the elastic substrate (2) is connected with the base (1), the piezoelectric material thin sheet (3) is laminated with the elastic substrate (2), the mass blocks (4) are arranged at one end, far away from the base (1), of the elastic substrate (2), an electrode (31) and an electrode (32) are arranged on the surface of the piezoelectric material thin sheet (3), an electrode cutting line (33) is arranged between the electrode (31) and the electrode (32), the electrode cutting line (33) is formed in an area in a middle line in the direction from the base (1) to the mass blocks (4), wherein the electrodes are not arranged in the area. The mass blocks (4) are symmetrically distributed and arranged relative to the electrode cutting line (33), and the cantilever mechanism for piezoelectric power generation has multi-mode characteristics and broadband characteristics.

Description

technical field [0001] The invention relates to a piezoelectric generating cantilever beam mechanism, in particular to a multi-deformation mode piezoelectric generating mechanism utilizing a piezoelectric cantilever beam. Background technique [0002] The most basic structure of the piezoelectric cantilever beam power generation device used to collect random vibration energy is as follows: figure 1 As shown, it is composed of a base 1, an elastic substrate 2, a piezoelectric ceramic wafer 3 and a lumped mass 4. The vibration of the base drives the system to vibrate, causing the piezoelectric cantilever to bend, and the piezoelectric ceramic produces strain and stress. The characteristic converts the stress into the voltage between the two electrodes to form the power generation capacity, and then collects the generated electric energy through the collection circuit. There is an optimal operating frequency of this power generation device, which is the natural frequency of th...

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Problems solved by technology

[0003] In order to overcome the shortcomings of existing piezoelectric cantilever generators that cannot make full use of vibration energy due to their small bandwidth under low-frequency operating conditions, a dual-inertia system that can decouple the natural frequencies of the bending mode and torsional mode of the piezoelectric cantilever is proposed. The piezoelectric cantilever mechanism adjusts the natural frequency of the bending vibration and the torsional motion of the piezoelectric cantilever in order to arrange the natural frequencies of the two modes within the required frequency range and enhance the overall frequency of the piezoelectric cantilever mechanism. width

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