微型电磁式振动能量采集器的结构设计与仿真研究

随着大规模集成电路、无线传感网络的发展和对微机电技术研究的逐渐深入,基于微机电系统(MEMS)技术的微型电源具有广阔的应用前景。作为微型电源的一个分支,微型电磁式振动能量采集器可将环境中普遍存在的振动能转换为电能,从而可以长期有效的为传感器件供电。简单介绍了电磁式振动能量采集器的物理模型和工作原理,研究了在正弦激励下采集器的振动特性,分析了采集器结构的固有频率与振动形式,并利用有限元法对结构进行优化,提出了一种复合式振动能量采集器结构并进行了仿真研究,该结构与传统单一永磁体结构相比,输出电压显著提高。

Structural Design and Simulation of Micro Electromagnetic Vibration Energy Harvester

Along with the rapid development of large scale integrated circuits,wireless sensor networks and the farther research on micro electro mechanical system(MEMS) technology,MEMS-based micro power has wide application prospects.As a branch of micro power supply,micro electromagnetic vibration energy harvester can convert vibration energy prevalent in the environment into electrical energy,which can be used as a long-term effective supply for the sensor devices.The physical model and working principles of vibration energy harvester is simply described.The vibration characteristics of the harvester under sinusoidal excitation are studied.The vibration form and natural frequencies of the harvesters’ structure are analyzed,and structural optimization is proposed by means of the finite element method.A composite structure of vibration energy harvester is presented;the output efficiency is greatly improved compared to traditional single magnet structure.