基于双稳态磁耦合效应的瓦级高功率电磁振动能量收集器

提出一种基于双稳态磁耦合效应的高密度电磁振动能量收集器，通过引入导磁铁心绕组对中间悬浮磁铁产生非线性磁力，可以产生双稳态势能阱实现低频段工作频带的拓宽。同时，导磁铁心与悬浮磁铁之间的强磁耦合作用能够增强线圈内部的磁通量变化进而提高输出功率。针对双稳态磁耦合振动能量收集器进行动力学建模仿真和试验测试分析，结果表明悬浮磁铁与导磁铁心之间的非线性磁耦合效应促使磁铁在两个势能阱之间进行大振幅的混沌或周期性振动，将工作频率范围拓宽至8～18 Hz。在受到加速度为4g的正弦振动直接激励时，能量收集器的输出功率为1.082 W，达到瓦级高功率输出，有望实现工业物联网传感节点的自供电，助力万物互联。

Bistable Electromagnetic Vibration Energy Harvester Based on Magnetic Coupling Effect Realizing Watt-level Power Output

A high power output electromagnetic vibration energy harvester based on the bistable magnetic coupling effect is proposed. By introducing a permeable iron core to generate a nonlinear magnetic force on the suspended magnet in the middle, a bistable potential energy trap can be generated to achieve a widening of the operating bandwidth under low frequency vibration. At the same time, the strong magnetic coupling between the permeable core and the suspended magnet can enhance the magnetic flux variation inside the coil and thus increase the output power. The results show that the nonlinear magnetic coupling effect between the suspended magnet and the permeable core drives the magnet to vibrate chaotically or periodically with large amplitude between the two potential energy traps, widening the operating frequency band to 10 Hz. When directly excited by sinusoidal vibration with an acceleration of 4g, the output power of the energy harvester is as high as 1.082 W, reaching a watt-level high power output. This research will provide a technical support for the self-powered and wireless development of sensor network nodes in the industrial internet of things.