微型电磁驱动膜片泵理论分析与实验
Theoretical Analysis and Experiment Research of Micro Membrane Pump Actuated by Magnetic Force
Abstract
研究一种新颖的电磁力驱动的膜片泵,它由驱动线圈、嵌有小永磁体的PdMS膜片及阀体构成,具有体积小,制作简单,控制精度高的特点.永磁体在通电线圈产生的磁场中受到电磁力作用,驱动膜片运动,使膜腔产生体积变化引起液体单向流动.重点分析了磁场大小、泵的电磁力大小及在该电磁力作用下膜片的变形量,通过MATlAb仿真,分析了电流输入与膜片变形的关系.对电流大小与液体流量、脉冲频率与液体流速进行了实验测试.实验结果显示该泵可在2.5Hz时实现最小泵送量为2.75μl/MIn. In this paper,we study a novel membrane pump actuated by magnetic force,which is composed of electrical core,PDMS membrane with magnet and unilateral valves.It is small,easy-fabricated and highly controlling precise.When the core is electrified,the magnet is inspired in the magnetic field,actuating the membrane to move,as a result the volume of the chamber changes causing the water to flow.In this paper we emphasize on the analysis of magnetic field,magnetic force of the pump and deflection of the membrane with the magnetic force.With Matlab simulation,we analyze the relation between electric current and deflection of the membrane.Also,we do experiment on both of the relation between electric current and flux,and the relation between frequency and flux velocity.The experimental result indicates that the pump can achieve minimum flow 2.75 μL/min when the rate of recurrence is 2.5 Hz.