高体积优值系数振动能量采集器的设计与性能测试  

Design and performance test of a high volumetric Figure of Merit electromagnetic vibration energy harvester

作　　者：任龙[1] 陈仁文[1] Stephen Burrow 夏桦康 张笑笑[1] REN Long;CHEN Renwen;Stephen Burrow;XIA Huakang;ZHANG Xiaoxiao(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics ＆Astronautics, Nanjing, 210016, China;Faculty of Engineering,University of Bristol,Bristol,BS8 1TR,United Kingdom)

机构地区：[1]南京航空航天大学机械结构力学及控制国家重点实验室,南京210016 [2]布里斯托大学工程系

出　　处：《振动与冲击》2018年第10期102-109,共8页Journal of Vibration and Shock

基　　金：江苏省普通高校研究生科研创新计划项目(KYLX15-0228);江苏省高校优势学科建设工程(PAPD)

摘　　要：小尺寸振动能量采集器通常难以高效采集低频振动能量。为提高能量采集效率,设计了一种高体积优值系数磁电式能量采集器。采用集总参数等效磁路模型对其换能系统的部分结构参数进行了优化,以提高感应线圈运动区域中运动方向上的磁链梯度,通过有限元分析验证了解析模型和理论结果。最后分别制作了3台不同参数的样机进行实验。实验结果表明,振动激励频率22.5 Hz、加速度幅值为100 mg时,经过参数优化的振动能量采集器能够在匹配负载上输出0.748 mW的平均功率,相应的体积优值系数达到了1.11%,优于其他两台样机在各自共振状态下的0.31%和0.77%。研究表明,通过合理优化磁电换能系统磁路,能够提高能量采集器的体积优值系数,是低频振动能量采集器小型化的一种实现途径。Small-scale vibration energy harvesters that can work at low frequencies efficiently are challenging to realize. To increase their energy harvesting efficiency,a type of high volumetric Figure of Merit magnetoelectric vibration energy harvester was proposed. To increase the magnetic linkage gradient of its coil in moving direction and in its motion region, a lumped parameters equivalent magnetic circuit model was adopted in its magnetic structural parameters optimization. A finite element analysis was then used to verify the analytical model and theoretical results. Finally,3 prototypes with different parametric combinations were manufactured and fabricated for experiments. The experimental results indicate that the average output power over its matched load resistance can reach 0. 748 mW under the excitation of 22. 5 Hz and 100 mg. The corresponding volumetric Figure of Merit can reach 1. 11%,which is higher than those of the other two prototypes（ volumetric Figure of Merit of 0. 31% and 0. 77% in their own resonances）. The research shows that,by the rational optimization of its magnetic circuit of the magnetoelectric transducer,the energy harvester can increase its volumetric Figure of Merit efficiently. It can be a realizing miniaturization method for low frequency vibration energy harvesters.

关 键 词：振动能量采集器 磁电式 体积优值系数 等效磁路模型 有限元分析 

分 类 号：TM919[电气工程—电力电子与电力传动]