基于非对称弹簧的宽频率范围振动能量收集器  

Wide Frequency Range Vibration Energy Harvester Based on Asymmetric Springs

作　　者：高凯 彭晗 王劭菁 徐鹏 陈永 陈佳桦 孙寒燚 Gao Kai;Peng Han;Wang Shaojing;Xu Peng;Chen Yong;Chen Jiahua;Sun Hanyi(State Grid Shanghai Electric Power Research Institute,Shanghai 200437 China;State Key Lab of Advanced Electromagnetic Engineering Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology,Wuhan 430074 China)

机构地区：[1]国网上海市电力公司电力科学研究院,上海200437 [2]强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院),武汉430074

出　　处：《电工技术学报》2023年第10期2832-2840,共9页Transactions of China Electrotechnical Society

基　　金：国家电网有限公司科技资助项目(52094020006X)。

摘　　要：为了改善单共振点振动能量收集器频率范围窄,对环境中随机分布的宽频率范围振动能量收集功率低的问题,该文提出一种基于非对称弹簧的宽频率范围振动能量收集器。首先,在阐述振动能量收集器基本原理的基础上,分析了弯曲横梁弹簧结构特性以及关键参数对于共振频率的影响规律。在此基础上,提出一种基于非对称弹簧的宽频率范围振动能量收集装置,详细讨论了其结构的基本原理和运动模式,并对不同弹簧组合形成的收集器进行了仿真分析。最后,制作了样机进行实验,得到不同的非对称弹簧下的输出特性,其中1 mm厚度的非对称弹簧结构在67 Hz、115 Hz的振动激励下输出功率分别达到1.36 mW和0.16 mW,收集频率范围提高一倍。With the rapid development of the Internet of Things,more and more wireless sensor networks and low-power electronic devices are widely used.At present,the primary power source of these devices is still traditional chemical batteries.These batteries have a low energy density,short lifespan,and environmental pollution.Moreover,replacing batteries for hundreds of millions of sensors requires many human and material resources.Therefore,obtaining energy from environmental energy,such as the sun,heat,wind,and vibration,as an alternative energy source for these devices has attracted considerable research interest.Among these energy sources,the vibration energy in the environment is widely regarded as one of the most concerned and researched energy sources because of its existence and not restricted by the environment.However,vibrations in the environment usually have broad frequency characteristics.In order to effectively harvest energy from these vibration sources,a wide frequency range energy harvester is required.This paper proposes a novel vibration energy harvester with a wide frequency range based on asymmetric springs.A new architecture of dual-asymmetric-springs with one magnet is discussed for wide frequency range coverage,flexible vibration pattern,and easy implementation.Firstly,the basic theory of electromagnetic power generation is introduced,and the physical characteristics of planar springs with bentbeams are investigated.The characteristic frequencies of different spring designs are presented,which is helpful for future design adjustments.It is concluded that the thicker the spring thickness is,the higher the characteristic frequency.The more spring beams are,the higher the characteristic frequency will be.The longer the spring beams are,the higher the characteristic frequency will be.Secondly,the architecture of a vibration energy harvester with asymmetric springs is explored.Vibration movement feature and electromagnetic conversion features are fully discussed with Finite-element analysis.The proposed

关 键 词：平面弹簧 振动能量收集器 非对称弹簧 宽频率范围 

分 类 号：TM619[电气工程—电力系统及自动化]