采用磁电换能器的振动能量采集器

采用磁致伸缩/压电层合磁电换能器设计了一个振动能量采集器，该能量采集器采用悬臂梁作为振动敏感机构，并用四个NdFeB磁铁组成磁路放在悬臂梁末端.该磁路在空气隙中产生梯度较大的非均匀磁场，使得磁电换能器在较小的振动下感应到较大的磁场变化量，输出较高的功率.利用等效磁荷理论，分析了空气隙磁场分布以及振动时磁路受到的磁力，并用林斯泰特-庞加莱法研究了能量采集器的非线性振动特性，同时将能量采集器的振动方程和换能器的磁电特性结合，分析了能量采集器谐振时的机-磁-电转换特性.通过实验表明：理论与实验符合得较好，且在加 关键词： 振动能量采集 磁致伸缩/压电层合材料 机磁电转换 非线性振动

Vibration energy harvester based on magnetoelectric transducer

An energy harvester is presented to scavenge energy from ambient vibrations using magnetostrictive/piezoelectric laminated magnetoelectric (ME) transducer. A cantilever beam is employed as the vibration sensitive element of the harvester,and a magnetic circuit made up of four NdFeB magnets is placed on the free end of the beam. Since the magnetic circuit produces a concen trated flux gradient in the air gap,the ME transducer can induce large magnetic field variations in the low level vibration,thus high out...