一种宽频的磁式压电振动能量采集器

基于环境能量采集的压电振动能量采集器为无线传感器和微机电系统的长期供能提供了一种有效解决方案.目前研制的压电式振动能量采集器存在工作频率高,且频带窄的问题.给出了一种通过磁力的引入使其在低频下工作的、宽频的压电振动能量采集器,并搭建了测试系统对器件进行分析测试.在压电悬臂梁上放置永磁铁取代传统的质量块,同时在悬臂梁的上...

A magnetic structure for broadband piezoelectric vibration energy harvester

The piezoelectric vibration energy harvester based on the environmental energy collection provides a solution to the long-term power supply to wireless sensor and micro-electro-mechanical system(MEMS).Currently developed piezoelectric vibration energy harvester encounters problems of high frequency and narrow frequency band.A piezoelectric vibration energy harvester working at low frequencies and the broadband frequency environment is presented,and a test system is built to analyze the test device.The permanent magnet is placed on the piezoelectric cantilever to replace the traditional mass,and a couple of permanent magnets is also placed on the upper and above of the piezoelectric cantilever respectively.Experiment is carried out under the 0.5 gn acceleration on the piezoelectric cantilever(length 40 mm,width 8 mm,thickness 0.8 mm).The results show that the effective frequency band is 80 ~100 Hz above peak voltage of 10V,which enlarges 5 Hz compares with the traditional non-magnetic piezoelectric vibration energy harvester.