A bending-mode galfenol electric power harvester
A bending-mode galfenol electric power harvester
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DOI：
10.1177/1045389x12436729
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发表时间：
2012-04-01
影响因子：
2.7
通讯作者：
Flatau, Alison B.
中科院分区：
文献类型：
--
作者：
Yoo, Jin-Hyeong;Flatau, Alison B.
铁镓合金(Galfenol)具有高磁致伸缩、良好的机械性能、高磁导率和宽的工作温度范围，是一种很有前途的换能器材料。在这项研究中，我们介绍了一个概念验证原型能量收集器的结果，该样机产生的输出电压与设备的基本加速引起的Galfenol元件的负载诱导弯曲成正比。该装置由粘结在铝悬臂梁上的多晶半乳糖酚条组成，有效长度为35.81 mm。两个黄铜片，每个都包含一个永久磁铁，用来对光束的两端进行质量加载，并通过Galfenol条提供偏磁场。在紧密缠绕在悬臂梁周围的感应线圈中感应的电压捕捉到了当梁振动时Galfenol条内磁通量变化的时间速率。该器件的第一弯曲模谐振频率为223赫兹。样机在222赫兹的Ig加速度下产生的功率为2.2 mW(均方根)，相当于每输入到收割机的单位机械功率的电功率输出效率超过60%。
Iron-gallium alloys (galfenol) are promising transducer materials that combine high magnetostriction, desirable mechanical properties, high permeability, and a wide operational temperature range. In this study, we present results from a proof-of-concept prototype energy harvester that produces an output voltage proportional to the load-induced bending of the galfenol element caused by a base acceleration of the device. The device consists of a polycrystalline galfenol strip bonded to an aluminum cantilever beam, which has an effective length of 35.81 mm. Two brass pieces, each containing a permanent magnet, are used to mass load each end of the beam and to provide a magnetic bias field through the galfenol strip. The voltage induced in an induction coil closely wound around the cantilever beam captures the time rate of change of magnetic flux within the galfenol strip as the beam vibrates. The first bending-mode resonant frequency of the device was 223 Hz. The power generated from the prototype when subjected to a Ig acceleration at 222 Hz was 2.2 mW (root mean square), which corresponded to an efficiency of more than 60% for the electrical power output per unit mechanical power input to the harvester.