抗磁-气流混合悬浮理论及仿真分析

Theory and simulation analysis of diamagnetic-airflow hybrid levitation

提出了一种抗磁-气流混合悬浮结构,利用提升磁铁和气流使悬浮转子稳定地悬浮于热解石墨板上方。通过理论分析和有限元数值分析方法对该抗磁悬浮结构的悬浮特性开展研究;利用压缩氮气作为气源进行实验测试研究。在标准温度和压力下,当气流量为2198 sccm时,悬浮转子转速达到16666 r/min,悬浮间隙为0.7 mm。通过调整喷嘴的垂直位置,悬浮转子可以在悬浮间隙为0.2~0.8 mm的任意高度上稳定悬浮旋转。当气流速度达到2748 sccm时,悬浮转子的转速增加到22300 r/min。采用混合悬浮结构的悬浮转子具有较大的悬浮间隙和较高的旋转速度。这种悬浮结构有望应用于气流驱动下的传感、能量采集和空气轴承。

In this paper,a diamagnetic-airflow hybrid levitation structure is reported,with a levitated rotor stably levitated above a diamagnetic disc just using a lifting magnet and airflow.The levitation characteristics were studied through theoretical analysis and finite element analysis(FEA)method.And driving experiment was carried out using compressed nitrogen as driving source.The rotation speed of the levitated rotor is 16666 r/min,and the levitation gap is 0.7 mm when the airflow rate is 2198 sccm under standard temperature and pressure.At the same time,the levitated rotor can be stably levitated and rotated at any height from 0.2 mm to 0.8 mm by adjusting the vertical position of the nozzles.When the airflow rate reaches 2748 sccm,the speed of the levitated rotor is 22300 r/min.With the hybrid levitation structure,the levitated rotor has a large levitation gap and a high rotation speed.This levitation structure is expected to be applied to sensing,energy harvesting and air bearing under actuation of airflow.