Performance of improved magnetostrictive vibrational power generator, simple and high power output for practical applications
Performance of improved magnetostrictive vibrational power generator, simple and high power output for practical applications
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DOI：
10.1063/1.4917464
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发表时间：
2015-05-07
影响因子：
3.2
通讯作者：
Ueno, Toshiyuki
中科院分区：
文献类型：
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作者：
Ueno, Toshiyuki
振动发电技术在各个领域得到了有效的应用。作者发明了一种利用磁致伸缩材料的新型振动发电装置。该装置是基于平行梁结构，包括一个铁镓合金杆缠绕线圈和磁轭伴随永磁体。当弯曲力施加在装置的尖端上时，由于逆磁致伸缩效应，杆内的磁化随着感应应力而变化。在振动中，磁化的时间变化在缠绕的线圈上产生电压。磁致伸缩类型在高效率和高鲁棒性以及低电阻抗方面优于传统的使用压电或移动磁体类型。在此，作者建立了简单、坚固、可耐受实际应用的大功率输出的装置配置。此外，改进后的器件与传统的器件相比，使用更少的Fe-Ga和永磁体体积，成本更低，并且其通过焊接的组装容易且快速，适合于大规模生产。使用2 x 0.5 x 7 mm的Fe-Ga棒（3），在212 Hz和1.2 G的共振振动下，在微型原型中获得了3 mW/cm（3）的平均功率。此外，还观察到了阻尼效应，这表明发电机的能量转换率很高。(C)2015 AIP Publishing LLC.
Vibration based power generation technology is utilized effectively in various fields. Author has invented novel vibrational power generation device using magnetostrictive material. The device is based on parallel beam structure consisting of a rod of iron-gallium alloy wound with coil and yoke accompanied with permanent magnet. When bending force is applied on the tip of the device, the magnetization inside the rod varies with induced stress due to the inverse magnetostrictive effect. In vibration, the time variation of the magnetization generates voltage on the wound coil. The magnetostrictive type is advantageous over conventional such using piezoelectric or moving magnet types in high efficiency and high robustness, and low electrical impedance. Here, author has established device configuration, simple, rigid, and high power output endurable for practical applications. In addition, the improved device is lower cost using less volume of Fe-Ga and permanent magnet compared to our conventional, and its assembly by soldering is easy and fast suitable for mass production. Average power of 3 mW/cm(3) under resonant vibration of 212 Hz and 1.2G was obtained in miniature prototype using Fe-Ga rod of 2 x 0.5 x 7 mm(3). Furthermore, the damping effect was observed, which demonstrates high energy conversion of the generator. (C) 2015 AIP Publishing LLC.