永磁铁近场等效阻尼计算分析

目的探究相对速度对等效电涡流阻尼效应的影响规律。方法利用解析法和有限元法分别分析了柱塞型电涡流吸振器的动态电磁场分布和电涡流等效阻尼效应,并基于有限元法分析了永磁铁在不同运动速度下的等效阻尼效应。结果有限元法求解电涡流等效阻尼的精度更高,相对运动速度对等效电涡流阻尼系数有相应非线性影响规律。结论解析法认为的恒定磁场实际中是不存在的,等效电涡流分布和强度高度依赖于磁装置的运动特性。

Calculation and Analysis of Near Field Eddy Current Damping of Permanent Magnet

The work aims to investigate the influence of relative velocity on equivalent eddy current damping effect. The dynamic electromagnetic field distribution and eddy current equivalent damping effect of plunger type eddy current vibration absorber were analyzed by analytical method and finite element method respectively, and the equivalent damping effect of permanent magnet at different moving velocity was analyzed based on finite element method. The finite element method was more accurate in solving the equivalent damping of eddy current, and the relative velocity had a corresponding nonlinear influence on the equivalent damping coefficient of eddy current. According to the analytical method, the constant magnetic field does not exist in practice, and the distribution and intensity of the equivalent eddy current are highly dependent on the motion characteristics of the magnetic device.