脉冲成形网络参数对轨道型电磁驱动系统效率的影响
Effect of pulse forming network parameters on efficiency of electromagnetic launch system
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摘要: 针对分布馈电式（DES）轨道型电磁驱动系统，建立了基于PSpice的电路模型；采用最常见的电容储能方式构成脉冲成形网络(PFN)；负载模型充分考虑电枢运动时的滑动摩擦，以及导轨电感、电阻等非线性因素。由仿真结果得到的电流值可以计算出电枢所承受的电磁力，从而得到电枢的加速度、速度，以及动能。分别选取不同电容器组的电容量或初始电压，脉冲成形电感器的电感量，主放电开关的闭合时间间隔，以及PFN模块参数（包括模块的数量、结构等），进行仿真分析，得出在各种参数下的系统效率，并加以比较，确定了几种可以有效提高轨道型电磁驱动系统效率的方法或者最优化的参数。仿真结果表明:在电枢质量与加速距离不变的条件下，电容器组的电容量或初始电压越高，电枢初速度越大，而系统效率随着电压的升高先增大后减小；脉冲成形电感器的电感量越大，电感器中的剩余能量越大，系统效率越低；主放电开关的闭合时间间隔越短，系统的效率越高；在初始能量一定的前提下，电源的模块数越多，电枢的出膛速度越大，系统效率也越高，可以通过采用多组小电容值的电容，来提高系统的效率；优化的PFN模块参数设计能够提高系统的效率。Abstract: A PSpice model of electromagnetic launch(EML) system was built up for the distributed energy store(DES) powered railgun. The pulsed power supply adopts the capacitor-based pulse forming network(PFN), which is widely-used in railgun systems. The railgun model takes consideration of many nonlinear factors caused by the movement of armature. During simulation, various parameters were applied to calculate the efficiency of the EML system, including capacitance and initial voltage of capacitor bank, inductance of pulse forming inductor, intervals of crowbar switches, parameters of pulse forming units and so on. Through comparison and analysis, several methods to raise the efficiency of the EML system were acquired. The simulation results show that, for given amature mass and accelerating distan
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Key words:
- electromagnetic launch system /
- efficiency /
- pulse forming network /
- pspice /
- distributed energy store
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