一种宽频的磁式压电振动能量采集器  

A magnetic structure for broadband piezoelectric vibration energy harvester

作　　者：马华安[1] 刘景全[1] 唐刚[1] 杨春生[1] 李以贵[1] 

机构地区：[1]上海交通大学微纳科学技术研究院微米/纳米加工技术国家级重点实验室薄膜与微细技术教育部重点实验室,上海200240

出　　处：《传感器与微系统》2011年第4期66-68,共3页Transducer and Microsystem Technologies

基　　金：国家自然科学基金资金项目(60777016);科技部国际合作项目(2009DFB10330);航空重点实验室基金资金项目(20080857002);上海市浦江人才计划资助项目(09PJ1406200);上海市科委科技计划资助项目(08230705500)

摘　　要：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,同时在悬臂梁的上下方也放置不同极性的永磁铁。对压电悬臂梁(长40 mm、宽8mm、厚0.8 mm),在0.5 gn加速度作用下进行试验测试,峰峰电压10 V以上的有效频带为80～100 Hz,与传统无磁铁振动式压电能量采集器相比,有效地拓展了5 Hz的工作频带。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.

关 键 词：压电悬臂梁 振动 能量采集 宽频 永磁铁 

分 类 号：TP332.3[自动化与计算机技术—计算机系统结构]