当前位置: X-MOL 学术Sensors › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Piezoelectric Energy Harvesting from Low-Frequency Vibrations Based on Magnetic Plucking and Indirect Impacts
Sensors ( IF 3.9 ) Pub Date : 2022-08-08 , DOI: 10.3390/s22155911
Michele Rosso 1 , Alessandro Nastro 2 , Marco Baù 2 , Marco Ferrari 2 , Vittorio Ferrari 2 , Alberto Corigliano 1 , Raffaele Ardito 1
Affiliation  

This work proposes a mono-axial piezoelectric energy harvester based on the innovative combination of magnetic plucking and indirect impacts, e.g., impacts happening on the package of the harvester. The harvester exploits a permanent magnet placed on a non-magnetic mass, free to move within a predefined bounded region located in front of a piezoelectric bimorph cantilever equipped with a magnet as the tip mass. When the harvester is subjected to a low-frequency external acceleration, the moving mass induces an abrupt deflection and release of the cantilever by means of magnetic coupling, followed by impacts of the same mass against the harvester package. The combined effect of magnetic plucking and indirect impacts induces a frequency up-conversion. A prototype has been designed, fabricated, fastened to the wrist of a person by means of a wristband, and experimentally tested for different motion levels. By setting the magnets in a repulsive configuration, after 50 s of consecutive impacts induced by shaking, an energy of 253.41 μJ has been stored: this value is seven times higher compared to the case of harvester subjected to indirect impacts only, i.e., without magnetic coupling. This confirms that the combination of magnetic plucking and indirect impacts triggers the effective scavenging of electrical energy even from low-frequency non-periodical mechanical movements, such as human motion, while preserving the reliability of piezoelectric components.

中文翻译:

基于磁采和间接影响的低频振动压电能量收集

这项工作提出了一种单轴压电能量采集器,该采集器基于磁性采摘和间接冲击的创新组合,例如发生在采集器封装上的冲击。采集器利用放置在非磁性质量块上的永磁体,在预定义的有界区域内自由移动,该区域位于压电双晶片悬臂梁前面,压电双晶片悬臂梁配有磁铁作为尖端质量。当收割机受到低频外部加速度时,移动质量通过磁耦合引起悬臂的突然偏转和释放,随后相同质量对收割机包装产生冲击。磁性弹拨和间接影响的综合效应引起频率上转换。已经设计、制造了一个原型,通过腕带固定在人的手腕上,并针对不同的运动水平进行了实验测试。通过将磁铁设置为排斥配置,在振动引起的连续冲击 50 秒后,存储了 253.41 μJ 的能量:该值是收割机仅受到间接冲击(即没有磁力)的情况的 7 倍耦合。这证实,即使是低频非周期性机械运动(如人体运动),磁性弹拨和间接冲击的结合也能触发电能的有效清除,同时保持压电元件的可靠性。已存储 41 μJ:与仅受到间接冲击(即没有磁耦合)的收割机相比,该值高出 7 倍。这证实,即使是低频非周期性机械运动(如人体运动),磁性弹拨和间接冲击的结合也能触发电能的有效清除,同时保持压电元件的可靠性。已存储 41 μJ:与仅受到间接冲击(即没有磁耦合)的收割机相比,该值高出 7 倍。这证实,即使是低频非周期性机械运动(如人体运动),磁性弹拨和间接冲击的结合也能触发电能的有效清除,同时保持压电元件的可靠性。
更新日期:2022-08-08
down
wechat
bug