基于Halbach永磁阵列的电磁振动能量采集器设计与测试

Design and Testing of Electromagnetic Vibration Energy Harvester Based on Halbach Permanent Magnet Array

为了在低频振动环境中更好地采集振动能量,提出一种基于Halbach永磁阵列的电磁振动能量采集器。利用Ansoft Maxwell有限元软件对电磁振动能量采集器进行仿真研究,并加工组装了原理样机,测试其发电性能。结果表明:在其他参数保持不变的情况下,优化定子槽深、定子槽数或定子齿厚均可有效提高电磁振动能量采集器的输出电压,永磁体径向厚度对采集器输出电压的影响不明显。样机在外接负载为60Ω、激振频率为9 Hz、振幅为5 mm时,可产生约0.4 W的输出功率,能够满足低功耗电子元器件的供能需求,具有较好的应用价值。

An electromagnetic vibration energy harvester based on Halbach permanent magnet array was proposed for the collection of energy better in low frequency vibration environment.The Ansoft Maxwell finite element simulation software was used to conduct simulation research on it,and a prototype of the electromagnetic vibration energy harvester was processed and assembled,and its power generation performance was tested.The results indicate that the output voltage of the electromagnetic vibration energy harvester can be improved effectively by designing the depth of the stator slot,the number of the stator slots or the thickness of the stator tooth while keeping other parameters unchanged.The radial thickness of the permanent magnet has no significant effect on the output voltage of the energy harvester.When the external load of the prototype is 60Ω,the excitation frequency is 9 Hz,and the amplitude is 5 mm,the electromagnetic vibration energy harvester can generate about 0.4 W output power,which can meet the energy supply requirements of low-power electronic components and has good application value.