微型抗磁悬浮振动能量采集器结构设计与分析

Structure Design and Analysis of the Micro-Vibration Energy Harvester Based on the Diamagnetic Levitation

利用抗磁性材料在磁场中产生抗磁力,从而实现稳定的悬浮。提出了一种新型的抗磁悬浮振动能量采集器,通过提升永磁体与悬浮永磁体产生的磁吸力抵消悬浮永磁体的重力,两个热解石墨薄板与悬浮永磁体之间产生的抗磁力作为使悬浮永磁体回复到平衡位置的回复力。通过Maxwell软件仿真,计算出悬浮永磁体的最大活动范围为1.3 mm,并且对比分析磁力的增量与抗磁力的增量,进一步计算出特定结构的固有频率为11.3 Hz。该结构避免了传统机械悬浮的能量损失,装置的能源来自外部的振动环境,可以持续为MEMS提供能源。

The stable magnetic levitation can be achieved with the diamagnetic force produced by the diamagnetic material in the magnetic field. A novel micro-vibration energy harvester based on the diamagnetic levitation was presented. The gravity of the floating magnet can be balanced by the attractive force between the lifting magnet and the floating magnet, the diamagnetic force between the two pyrolytic graphite sheets and the floating magnet works as the restoring force, which makes the floating magnet return to the equilibrium position. By the simulation of Maxwell software, the maximum range of the movement for the floating magnet is 1.3 ram. The compara- tive analysis of the magnetic force increment and the anti-magnetic force increment was made, and 11.3 Hz natural frequency of a specific structure was further calculated. The dissipation of the vi- bration energy through the mechanical contact of the structure is eliminated. And the structure absorbs the vibration energy from the environment, so it can provide the sustainable power for the MEMS.