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中文摘要：
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,且在加速度A=0·5g,频率f=33Hz的条件下,能量采集器获得了112·4μW的功率.
英文摘要：
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 output power can be obtained. Based on the equivalent magnetic charge theory,the magnetic field distribution of the air gap and the magnetic force of the magnetic circuit are analyzed ,and the nonlinear vibration performance of the harvester is studied using the Lindstedt-Poincaré method. The mechano-magneto-electric performance of the harvester at resonance is analyzed by combining the vibration equation of the harvester with the magnetoelectric characteristics of the ME transducer. The experimental results verified the analytical results,and a prototype produces a power of 112.4 _W for an acceleration of 0.5g at its resonant frequency of 33 Hz.
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