大间隙磁力传动系统电磁场切换相位角研究

基于ANSYS软件建立了行波磁场驱动的大间隙磁力传动系统的二维电磁场仿真模型,分析了电磁体四种磁极状态下,永磁体角位移位于0°到360°之间所受的磁力矩情况.为使系统获得最大驱动力矩,提出了电磁体磁极状态切换的最佳切换相位角的概念,并对其进行了求解.通过分析系统中电磁体和永磁体间耦合距离及两电磁体间磁极距离对系统最佳切换相位角的影响,得到了最佳切换相位角的近似计算公式.通过轴流式血泵负载实验,结合血泵负载力矩模型,计算并比较了各种切换相位角下血泵的最大负载力矩.结果表明:按仿真所得的最佳切换相位角进行相位切换可使系统具有最大驱动能力.

Phase Angle of Electromagnetic Field in Large Gap Magnetic Drive System

A 2-D electromagnetic simulation model of the large gap magnetic drive system driven by traveling wave magnetic field was established,and the magnetic moment for the four pole-states when the angular displacement of the permanent magnet ranged from 0°to 360° was simulated with ANSYS software.In order to get the largest driving torque of the system,the concept of the best phase angle for the pole-state of the electromagnets was presented.The approximate formula for the best phase angle was drawn by analyzing the influence of the coupling distance and electromagnet-pole distance on the best phase angle of the system.The largest load torque of the axial-flow blood pump for different phase angles was calculated and compared by using load torque model through experiment.The results have shown that the best phase angles obtained through simulation can get the largest driving torque.