A new vibration energy harvesting device which is adept at working under the condition of low-frequency vibration is designed in this paper. This device is constructed including several closed magnetic circuits which significantly improve the ability of energy harvesting. Meanwhile, the rack structures in the device lead to the change frequency of the coil magnetic field increasing, so that the device can adapt to work with low frequency vibration. After illustrated the structure and principle of the device, a series of numerical simulations using Ansoft Maxwell is introduced. While the static simulations expose the relationship between the relative permeability of ferromagnetic material and the maximum coil magnetic flux density as well as the relationship between the width of air gap and the maximum coil magnetic flux density; the dynamic simulations show the induced voltage and energy dissipation of the device. Based on the data of the simulations, the maximum average power when the frequency of vibration is 1 Hz is calculated, and it is much better than that of the similar device reported in other papers. It demonstrates that the new low-frequency vibration energy harvesting device is able to power for wireless sensor network nodes.%针对低频振动条件,设计了一种高效的振动能量收集装置.该装置形成闭合磁路,大幅度提高了能量获取能力；同时利用多齿结构,提高装置中线圈磁场变化的频率,使其适应于低频振动环境.论文在介绍了装置的结构和工作原理后,借助Ansoft Maxwell软件进行了数值仿真.利用静态仿真对比了不同相对磁导率的导磁材料以及不同气隙宽度对线圈最大磁感应强度的影响；利用动态仿真给出感应电压和能量损耗.根据仿真数据计算了该振动能量收集装置在1 Hz低频振动下所能达到的最大平均功率,该功率远高于已见报道的同类装置的功率值,表明该装置能为无线传感器网络节点供电.
展开▼
