A Bistable Vibration Energy Harvester with Closed Magnetic Circuit

14th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Sato, Takahiro^1 ; Sugisawa, Takeshi^1 ; Igarashi, Hajime^1

Graduate School of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Sapporo, Kita-ku

060-0814, Japan^1

关键词: Bistables;    Coil systems;    Double-well potential;    Magnetic force;    Magnetic resistance;    Output power;    Thin air;    Vibration energy harvesters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/557/1/012081/pdf
DOI  :  10.1088/1742-6596/557/1/012081

来源: IOP

【 摘 要 】

In this work, to increase magnetic flux passing through the electric coil in a bistable vibration energy harvester, the magnetic circuit is made closed by introducing two coil systems which have magnetic core in their axis holes. The magnetic resistance of the magnetic circuit, composed of silicon steel and thin air gaps, is supressed to be small. The double well potential is realized from the spring force and nonlinear magnetic force between the magnets and the magnetic core. Two harvesters with opened and closed magnetic circuits are manufactured for comparison. It is also shown that the closed magnetic circuit can effectively improve the output power.