Bistable piezoelectric cantilever beam vibration energy collector

Abstract

The invention discloses a bistable piezoelectric cantilever beam vibration energy collector. The structure of the bistable piezoelectric cantilever beam vibration energy collector is that an internal magnet is installed in a free end of a cantilever beam; a fixed end is installed on a vertical face of a right-angle base; a spring is installed on a horizontal face of the right-angle base; an external magnet is arranged on the upper end of the spring; the external magnet and the internal magnet are arranged in a manner that poles with opposite polarities are disposed face to face; and a piezoelectric plate is adhered on the fixed end of the cantilever beam, 2-3mm away from the vertical face of the right-angle base. Vibration of the cantilever beam enables the piezoelectric plate to produce electric energy. The piezoelectric plate is connected with a lead used for outputting the electric energy. As to dynamic environmental stochastic excitation vibration, electric energy conversion can be realized effectively by adopting the bistable piezoelectric cantilever beam vibration energy collector in a condition with fixed structural parameters. However, real-time adjustment of magnet intervals according to changes of environmental excitation intensity is needed constantly for a rigid support external magnet system. By arranging the bistable piezoelectric cantilever beam vibration energy collector on roadsides or in occasions with vibration excitation backgrounds, vibration energy can be converted to electric energy.

Description

technical field [0001] The invention belongs to vibration or piezoelectric energy conversion technology, in particular to a device for collecting and generating vibration energy by adopting a bistable piezoelectric cantilever beam elastically supporting an external magnet. Background technique [0002] In recent years, with the development of microelectronics and radio wave technology, handheld electronic devices and wireless sensors have entered the era of miniaturization and low power consumption. Typically, these devices rely on traditional batteries to provide power, such as Ni-MH batteries, lithium-polymer batteries, and the like. But as we all know, the main disadvantages of this kind of battery are: first, (compared to the micro sensor) the volume is relatively large, which limits the further miniaturization of the micro sensor; second, the energy supply time or power is limited, and it needs to be replaced or charged after a period of use , especially for wireless s...

AI Technical Summary

Problems solved by technology

But as we all know, the main disadvantages of this kind of battery are: first, (compared to the micro sensor) the volume is relatively large, which limits the further miniaturization of the micro sensor; second, the energy supply time or power is limited, and it needs to be replaced or charged after a period of use , especially for wireless sensors in harsh climates or remote areas, this is a very harsh constraint

When the vibration excitation intensity is insufficient, the response of the cantilever beam cannot achieve a large-amplitude bistable transition oscillation, thereby reducing the electromechanical energy conversion efficiency

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