Analysis and Experiment of an Airflow Energy Harvester based on Diamagnetic Levitation

Jingyun Zhang, Yufeng Su
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Abstract

This paper proposes a set of energy harvesting structure that can effectively generate electrical power. Diamagnetic levitation structure is reported, with a floating magnet rotor levitated between two pyrolytic graphite plates just using a lifting magnet and airflow. The magnet rotor could be stably suspended under joint action of magnetic forces and diamagnetic forces, being driven to rotate by airflow. Three magnet rotors, with 1.5 mm, 3 mm and 4.5 mm thickness respectively, were adopted in the study so as to investigate the influence of structural parameters of the magnet rotor on the performance of the harvester. Simulation and experiment were carried out for the three magnet rotors. Among the tree magnet rotros, the 1.5mm-thick one has the best output performance , with the lowest dynamic stability. Therefore, the energy harvester is to find tradeoff between output characteristics and dynamics. In this work, it was discovered that the peak output voltage of the energy harvester increased with the square of flowrate. As the flowrate increased to 3000 sccm, the 1.5mm-thick rotor was rotating at a speed of 19729 rpm under standard temperature and pressure, with 1.255V output voltage and 98mW power. The diamagnetic levitation structure is expected to be applied to sensing, energy harvesting and air bearing under actuation of airflow due to its advantages of low friction, high rotation speed and large levitation space.
基于反磁悬浮的气流能量采集器的分析与实验
本文提出了一套能有效产生电能的能量收集结构。本文报道了一种反磁性悬浮结构,它是一种利用提升磁体和气流将浮磁转子悬浮在两个热解石墨板之间的结构。磁体转子在磁力和反磁力的共同作用下稳定悬浮,在气流的驱动下旋转。采用厚度分别为1.5 mm、3 mm和4.5 mm的3个磁性转子,研究磁性转子结构参数对收割机性能的影响。对三磁体转子进行了仿真和实验。在树磁转子中,1.5mm厚的输出性能最好,动态稳定性最低。因此,能量收集器就是要在输出特性和动力学之间找到平衡。在这项工作中,发现能量采集器的输出电压峰值随流量的平方而增加。当流量增加到3000 sccm时,1.5mm厚转子在标准温度和压力下以19729 rpm的转速旋转,输出电压为1.255V,功率为98mW。抗磁性悬浮结构具有摩擦小、转速高、悬浮空间大等优点,有望应用于气流驱动下的传感、能量收集和空气轴承等领域。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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