电磁轨道发射装置动态电感梯度分析

Analysis of dynamic inductance gradient of electromagnetic rail launcher

推导了导轨间磁场均匀分布和非均匀分布两种情况下电感梯度数学计算模型。引入了速度频率来模拟电枢发射过程速度趋肤效应,对导轨二维模型以及三维电磁场模型进行时谐仿真,并将获得的单位长度电感以及电感梯度,分别用于电气仿真系统中电感和电枢推力的计算。电气仿真和试验结果表明,电流和出口速度误差均在2%以内,证明了动态电感梯度分析及参数提取方法的正确性和准确性。

A mathematical calculation model of armature inductance gradient under the conditions of uniform and non-uniform magnetic field distribution between guide rails was deduced.The velocity frequency was introduced to simulate the velocity skin effect of armature emission process,and the time-harmonic simulation analysis was carried out on the 2D and the 3D electromagnetic field model.The inductance coefficient and the inductance gradient obtained from the simulation were used to calculate the dynamic inductance and the dynamic armature force in the simulation system.Electrical simulation and experiment results show that both the current and the velocity error are less than 2%,which proves the correctness and accuracy of dynamic inductance gradient analysis and parameter extraction method.