Physical Field Simulation Analysis Of The Inductor Of A Compact Pulse Power Module

Electromagnetic launching technology has broad application prospects in many fields,such as weapon equipment,scientific experiment,aviation and space flight and so on.As an important part of electromagnetic launching system,the research level of pulse power supply determines the engineering application process of electromagnetic railgun.In the development process of miniaturization and modularization of pulse power supply,electromagnetic interference,heating,electromagnetic force and other factors have become significant issues that impose restrictions on the development of pulse power technology.Therefore,this paper takes a compact capacitor storage type pulse power module with rated energy storage of 334 k J as the research object.The physical model of this module is selected to establish a physical model for numerical simulation analysis of electromagnetic field,temperature field and electrodynamic field.The main work is composed of the following parts :(1)First,this paper summarizes the composition of capacitor energy storage pulse power supply module and briefly describes its operating principle.The functions of the main components,such as pulse capacitor,wave-modulated inductor,thyristor,and freewheeling silicon stack,are described separately.The mathematical physical model,simulation load and simulation software are also briefly described.(2)Second,this paper conducts the transient electromagnetic field simulation analysis.In order to reduce the electromagnetic interference caused by discharge,a simplified physical model of the wave-modulated inductor and the shielding plate is established.The finite element method is used to numerically calculate and compare the single-layer shielding structure from different materials,different radius sizes and different thicknesses of the shielding plate.The simulation analysis takes into account the shielding of low-frequency magnetic field and high-frequency electromagnetic field.And the simulation analysis is also carried out for the double-layer combination plate of cast iron and copper.The results show that under the same radius and thickness size,the shielding effect of double-layer shielding plate composed of high permeability material and high conductivity material is better than that of single-layer high conductivity material shielding plate.(3)Third,this paper performs the transient temperature field simulation analysis.Based on the heating problem of the pulse power supply module under continuous working condition,the heat dissipation effect of deionized water under different flow velocity and initial temperature is analyzed.The simulation results show that when the flow velocity of deionized water reaches the turbulent critical velocity,the performance ratio of heat dissipation effect is the highest.The convective heat transfer coefficient increases with the initial temperature and velocity of deionized water.Therefore,when designing the flow rate of thermal management system,the initial temperature of deionized water should be considered.(4)Electrodynamic simulation analysis.Aiming at the problem that the lead-out terminal of the modulated inductor is affected by the electromotive force during discharge,the steady-state electrodynamic simulation of the inductor wrapped with insulating material is carried out,and the stress distribution cloud map of the modulated inductor is obtained,and the stress distribution is analyzed.The results show that the terminal of the modulated inductor receives the greatest force at the part where it intersects the inductor.Reinforcement or proper processing techniques should be adopted to avoid stress concentration when designing the inductor.