高效电磁式振动能量收集装置的设计

摘要

为了提高能量收集效率,降低装置复杂度,便于工业制造,提出一种新型方形振子电磁振动能量收集装置.该装置形成了闭合磁路能量转化效率高;同时使用方轴固定振子振动路径和磁轭对称放置的方法消除振子运动中的定位力;装置中永磁体、线圈位置固定,提高了装置的使用寿命.通过Ansoft Maxwell静态仿真,分析了气隙宽度、导磁材料相对磁导率和振子齿的厚度对铁芯中磁感应强度的影响,得出参数的最优值.利用动态仿真,得出优化后的装置单个线圈可产生1.2V的感应电动势,空载时最大功率为474.1 mW,带负载时最大有效输出功率为118.5 mW,可以为多数低功耗无线传感网络节点供电.%In order to improve utilization of energy harvesting,reduce the complexity of the device to facilitate industrial manufacturing,a novel electromagnetic vibration energy harvester using square vibrator was proposed.The device has a high efficiency on energy transferring because of closed magnetic circuits.At the same time,using a shaft as movement path for vibrator and placing yoke symmetrically to eliminate position force.Fixed magnet and coil position make the design stable.Through Ansoft Maxwell static simulation,the impact of the air gap width,the relative permeability and the height of vibrator tooth for the optimal values of these parameters are analyzed.Finally,dynamic simulation show s that a single coil of the optimized device can generate the induced electromotive force of 1.2 V,maximum power at no-load is 474.1 mW and total maximum effective power at load is 118.5 mW.The optimized device can supply power for many low consumed power wireless sensors.