磁耦合式可调频压电振动俘能器  

Magnetically-coupled tunable piezoelectric vibration energy harvester

作　　者：王淑云[1] 杜洁雅 黄喆人 阚君武[1] 柴超辉 张忠华[1] WANG Shuyun;DU Jieya;HUANG Zheren;KAN Junwu;CHAI Chaohui;ZHANG Zhonghua(Institute of Precision Machinery and Intelligent Structure,Zhejiang Normal University,Jinhua 321004,China)

机构地区：[1]浙江师范大学精密机械与智能结构研究所,浙江金华321004

出　　处：《光学精密工程》2024年第1期73-83,共11页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.51877199,No.52077201);浙江省重点研发计划资助项目(No.2021C01181);浙江省自然科学基金资助项目(No.LY20F010006);国家大学生创新创业训练计划资助项目(No.202210345062)。

摘　　要：为提高压电振动俘能器的环境适应性,提出一种磁耦合式可调频压电振动俘能器,利用激励器上主动磁铁和组合换能器上被动磁铁间的耦合作用及横摆簧片实现压电振子的单向限幅激励。通过对俘能器及磁对的建模和仿真分析,获得了俘能器结构参数对俘能器输出性能的影响,在此基础上制作俘能器样机并进行实验研究,获得了俘能器纵摆质量m_(1)、横摆质量m_(2)、横向距离Lx、纵向距离Ly、竖向距离Lz及负载电阻对俘能器输出性能的影响规律。结果表明:存在两阶谐振频率f_(1)和f_(2)使输出电压出现峰值U_(n1)和U_(n2),调节m_(1),m_(2),Lx,Ly及Lz会影响f_(1),f_(2),U_(n1)及U_(n2);其他条件一定时,存在最佳负载电阻2 200 kΩ使输出功率达到0.122 mW。通过选择合适的结构参数能够提升俘能器的有效频带和输出电压,对增强压电振动俘能器的可靠性和频率适应性具有一定的参考价值。To improve the environmental adaptability of a piezoelectric vibration energy harvester,a mag⁃netically-coupled tunable piezoelectric vibration energy harvester(PVEH)is proposed.The coupling ac⁃tion between the active magnet on the actuator and the passive magnet on the combined transducer and transversal spring was used to realize the unidirectional limiting excitation of the piezoelectric vibrator.Through modeling and simulation analyses of the energy harvester and magnetic pair,influences of the structural parameters of the energy harvester on the corresponding output performance could be deter⁃mined.On this basis,the energy harvester prototype was developed by selecting a better magnet diameter via experimental research.The influence laws of the energy harvester's longitudinal mass m_(1),transversal mass m_(2),transversal magnet spacing Lx,longitudinal magnet spacing Ly,vertical magnet spacing Lz,and load resistance on the output performance were also obtained.The results show that two order resonant frequencies f_(1) and f_(2) cause the output voltage to peak to U_(n1) and U_(n2), respectively. Moreover, adjusting m_(1), m_(2), Lx, Ly, and Lz will affect f_(1), f_(2), U_(n1), and U_(n2). Therefore, the effective frequency band and outputvoltage of the energy harvester can be increased when appropriate structural parameters are selected for theenergy harvester. When other conditions are given, there is an optimal load resistance of 2 200 kΩ that in⁃creases the output power to 0. 122 mW. Therefore, the effective frequency band and output voltage of theenergy harvester can be improved by selecting suitable structural parameters and distance between mag⁃nets. The results provide good reference value for enhancing the reliability and frequency adaptability ofthe PVEH.

关 键 词：压电 可调频 磁耦合 组合换能器 能量回收 

分 类 号：TN384[电子电信—物理电子学] TM619[电气工程—电力系统及自动化]