基于翼型的电磁能量采集器，包含动圈与多极磁体之间的平行阵列运动，以提高功率密度。

Airfoil-based electromagnetic energy harvester containing parallel array motion between moving coil and multi-pole magnets towards enhanced power density.

作者信息

Leung Chung Ming, Wang Ya, Chen Wusi

机构信息

Department of Mechanical Engineering, State University of New York, Stony Brook, New York 11794, USA.

出版信息

Rev Sci Instrum. 2016 Nov;87(11):114705. doi: 10.1063/1.4967492.

DOI:10.1063/1.4967492

PMID:27910368

Abstract

In this letter, the airfoil-based electromagnetic energy harvester containing parallel array motion between moving coil and trajectory matching multi-pole magnets was investigated. The magnets were aligned in an alternatively magnetized formation of 6 magnets to explore enhanced power density. In particular, the magnet array was positioned in parallel to the trajectory of the tip coil within its tip deflection span. The finite element simulations of the magnetic flux density and induced voltages at an open circuit condition were studied to find the maximum number of alternatively magnetized magnets that was required for the proposed energy harvester. Experimental results showed that the energy harvester with a pair of 6 alternatively magnetized linear magnet arrays was able to generate an induced voltage (V) of 20 V, with an open circuit condition, and 475 mW, under a 30 Ω optimal resistance load operating with the wind speed (U) at 7 m/s and a natural bending frequency of 3.54 Hz. Compared to the traditional electromagnetic energy harvester with a single magnet moving through a coil, the proposed energy harvester, containing multi-pole magnets and parallel array motion, enables the moving coil to accumulate a stronger magnetic flux in each period of the swinging motion. In addition to the comparison made with the airfoil-based piezoelectric energy harvester of the same size, our proposed electromagnetic energy harvester generates 11 times more power output, which is more suitable for high-power-density energy harvesting applications at regions with low environmental frequency.

摘要

在这封信中，对一种基于翼型的电磁能量采集器进行了研究，该采集器包含动圈与轨迹匹配多极磁体之间的平行阵列运动。磁体以6个磁体交替磁化的形式排列，以探索提高功率密度。特别地，磁体阵列在其尖端偏转跨度内与尖端线圈的轨迹平行放置。研究了开路条件下磁通密度和感应电压的有限元模拟，以确定所提出的能量采集器所需的交替磁化磁体的最大数量。实验结果表明，具有一对6个交替磁化线性磁体阵列的能量采集器在开路条件下能够产生20 V的感应电压（V），在风速（U）为7 m/s、自然弯曲频率为3.54 Hz且负载电阻为30 Ω最优值的情况下，能产生475 mW的功率。与传统的单磁体穿过线圈的电磁能量采集器相比，所提出的包含多极磁体和平行阵列运动的能量采集器能使动圈在摆动运动的每个周期中积累更强的磁通量。除了与相同尺寸的基于翼型的压电能量采集器进行比较外，我们提出的电磁能量采集器产生的功率输出高11倍，更适合于环境频率较低地区的高功率密度能量采集应用。