抗磁悬浮能量采集器振动与输出特性分析

Output Characteristic and Vibration Characteristic Analysis of Micro-Vibration Energy Harvester Based on Diamagnetic Levitation

对抗磁悬浮振动能量采集器中悬浮永磁体的非线性振动特性进行了分析,并在此基础上分析了感应线圈结构参数对输出特性的影响。利用MATLAB软件的Simulink组件仿真分析采集器的非线性振动特性,利用有限元分析软件COMSOL对能量采集器的输出特性进行了仿真分析。通过改变线圈参数发现,在线圈体积一定时,输出功率变化很小,电压随着铜线直径减小增加很快,所以可以通过微细加工减小铜线直径的方法来提高线圈的输出电压。最终在线圈总体积约为6.4 mm3,铜线直径为0.02 mm,匝数为500匝时,得到的电压峰值达到约93.8 m V。

On the basis of analyzing the nonlinear vibration characteristics of levitation permanent magnet in the diamagnetic vibration energy harvester,we could analyze the infuences of structure parameters to the output characteristics of the induction coil. We used MATLAB to simulate nonlinear vibration characteristics of micro-vibration energy harvester and the finite element analysis software COMSOL to simulate the output characteristics of energy harvester.By changing the coil parameters,we found that when the coil volume was determined,the changes of output power were very small but the voltage increased quickly with the increasing of coil diameter. Therefore,the output voltage of the coil could be improved by reducing the diameter of the wire by micro machines. Finally,when the total volume of the coil was about 6.4 mm3,wire diameter was 0.02 mm,coil number were 500,the voltage-peak reached about 93.8 mV.