Bistable double-piezoelectric cantilever beam vibration energy collector

Abstract

The invention discloses a bistable double-piezoelectric cantilever beam vibration energy collector. The bistable double-piezoelectric cantilever beam vibration energy collector is characterized in that two cantilever beams are oppositely arranged on a horizontal line in a left-and-right mode, an internal magnet is installed at the free end of the cantilever beam on the left side, an external magnet is installed at the free end of the cantilever beam on the right side, the fixed ends of the two cantilever beams are fixedly installed on the vertical plane of a right-angle base, the external magnet and the internal magnet are arranged in the mode that the magnetic polarity of the external magnet and the magnetic polarity of the internal magnet are oppositely rejected with each other, piezoelectric patches are pasted at the positions, 2-3mm away from the vertical plane of the right-angle base, of the fixed ends of the two cantilever beams, vibration of the cantilever beams enables the piezoelectric patches to generate electric energy, and the piezoelectric patches are connected with a lead to output the electric energy. Random excitation vibration is carried out on the variable environment, and the electric energy can be effectively converted through the bistable double-piezoelectric cantilever beam vibration energy collector under the condition that structure parameters are fixed and unchanged. Real-time adjustment on the distance of the magnets is required to be continuously carried out through the rigid supporting external magnet according to variation of environmental excitation strength. The bistable double-piezoelectric cantilever beam vibration energy collector is arranged beside a road and the field having the vibration excitation background, and the vibration energy can be converted into the electric energy.

Description

Technical field [0001] The invention belongs to vibration or piezoelectric energy conversion technology, and specifically relates to a bistable bi-stable piezoelectric cantilever beam that uses a piezoelectric cantilever beam to support an external magnet, and a device for collecting and generating vibration energy. Background technique [0002] In recent years, with the development of microelectronics and radio wave technology, handheld electronic devices and wireless sensors have entered an era of miniaturization and low power consumption. Under normal circumstances, these devices rely on traditional batteries to provide energy, such as nickel-metal hydride batteries, lithium polymer batteries and so on. However, as we all know, the main shortcomings of this kind of battery are: First, (compared to the micro sensor) 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 o...

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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