The Centrifugal Softening Effect of an Inverse Nonlinear Energy Harvester in Low-frequency Rotational Motion for Enhancing Performance

2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS) Pub Date : 2019-12-01 DOI:10.1109/PowerMEMS49317.2019.41031604008

Xutao Mei, Shengxi Zhou, Bo Yang, T. Kaizuka, Kimihiko Nakano

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Abstract

Recently, various nonlinear energy harvesters, which is aimed to provide the power supply for wireless sensors, are designed to harvest rotational energy. However, there are few studies for energy harvesting from rotational motion when the rotational speed is less than 120 rpm (2 Hz). In this paper, an inverse nonlinear piezoelectric energy harvester (PEH) is proposed for enhancing performance in low-frequency rotational motion via the centrifugal softening effect. In addition, according to Lagrange equation, the related theoretical model is derived. Furthermore, the experiments between the forward and inverse configurations in rotational motion are conducted under the rotational speeds ranging from 60 rpm to 160 rpm. The experimental results demonstrate that in low-frequency rotational motion the inverse PEH exhibits outstanding performance with the RMS voltage as high as 5 V, which is enough for powering some wireless sensors. Overall, the centrifugal softening effect is verified to be an effect method for energy harvesting in low-frequency rotational motion.

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逆非线性能量采集器在低频旋转运动中的离心软化效应

近年来，各种旨在为无线传感器提供电源的非线性能量收集器被设计用于收集旋转能量。然而，对于转速小于120rpm (2hz)时的旋转运动能量收集的研究很少。本文提出了一种逆非线性压电能量采集器(PEH)，利用离心软化效应提高其在低频旋转运动中的性能。此外，根据拉格朗日方程，推导了相关的理论模型。在60 ~ 160 rpm转速范围内，进行了正反两种构型的旋转运动实验。实验结果表明，在低频旋转运动中，反向PEH表现出优异的性能，其有效值高达5 V，足以为某些无线传感器供电。综上所述，离心软化效应是一种低频旋转运动能量收集的有效方法。

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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来源期刊

2019 19th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)

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