推挽式抗磁悬浮气流能量采集器动态稳定性分析

Dynamic Stability Analysis of Push-Pull Diamagnetic Levitated Airflow Energy Harvesters

为了探究推挽式抗磁悬浮气流能量采集器的动态稳定性,对其进行了力学分析。通过理论分析和数值分析发现,在径向位移一样的情况下,推挽式结构中的悬浮磁体受到的径向恢复力比只有提升磁体的结构更大;在径向位移增幅一样的情况下,推挽式结构中的悬浮磁体受到的轴向力变化比只有提升磁体的结构更小。实验发现,当推挽式结构中的悬浮磁体被体积流量为3000 mL/min的气流吹动时,其最大水平位移为2.27 mm,最大倾斜角度为0.482°,分别仅是只有提升磁体的结构的22.976%和3.998%。进行了只有单侧气流喷嘴工作的气流能量采集实验,发现推挽式结构解决了只有提升磁体的结构无法进行单侧气流能量收集的问题。在只有单侧气流喷嘴工作的情况下,其平均峰值电压达到了0.667 V,平均功率达到了11.68 mW,能量转化率达到了11.82%。研究表明推挽式结构在能量采集领域有更优秀的稳定性。

To investigate the dynamic stability of the push-pull diamagnetic levitated airflow energy harvester,a mechanical analysis was carried out.By theoretical and numerical analyses,it is found that the radial restoring force of the floating magnet in the push-pull structure is larger than that of the structure with only lifting magnets at the same radial displacement;the axial force variation of the floating magnet in the push-pull structure is smaller than that of the structure with only lifting magnets at the same increase in radial displacement.Through experiments,it is found that when the floating magnet in the push-pull structure is blown by a volume flow of 3000 mL/min,the maximum horizontal displacement of 2.27 mm and the maximum tilt angle of 0.482°are only 22.976%and 3.998%of those of the structure with only lifting magnets,respectively.The experiment of airflow energy collection with only single-side airflow nozzle was carried out.It is found that the push-pull structure solves the problem that the structure with only lifting magnets cannot collect unilateral airflow energy.With only a singleside airflow nozzle operating,the average peak voltage is 0.667 V,the average power is 11.68 mW,and the energy conversion rate reachs 11.82%.The study shows that push-pull structure has better stability in the field of energy harvesting.