Research And Optimization Design Of Coil Electromagnetic Launcher

Reluctance coil electromagnetic launch is an important speed method of electromagnetic launch.It accelerates the projectile by the magnetic field generated by the driving coil.At the same time,the projectile has no contact with the launching tube,avoiding friction ablation and other problems.It has a long service life and potential application prospects,which has attracted the attention of researchers.Reluctance coil electromagnetic launcher has advantages in launching large mass projectiles.Its structure is simple and controllable.It can not only be used as an accelerator for projectiles of ferromagnetic materials,but also has practical applications in many occasions.For the electromagnetic speed technology,the speed speed of the projectile and the speed efficiency of the launcher are very important indicators.According to the principle of reluctance coil electromagnetic launcher,the projectile can only be attracted without thrust.In the process of reluctance electromagnetic speed,due to the current in the driving coil can not be attenuated in time,when the projectile moves over the center of the driving coil,the force of the projectile is reversed,which leads to the speed speed and speed efficiency of the projectile are affected.Most of the current research focuses on avoiding residual current,and there are few studies on the rational utilization of residual current energy.Therefore,aiming at the residual current problem of the driving coil in the reluctance coil electromagnetic launcher,this paper proposes to combine the bridge driving circuit with the reluctance coil electromagnetic launcher,and reduce the influence of the reverse force of the projectile by recovering the residual current of the driving coil.This paper first introduces the basic principle of reluctance coil electromagnetic launcher.The working process of the bridge drive circuit in the reluctance coil electromagnetic transmitter is analyzed.The simulation model of single-stage electromagnetic launcher is established by finite element simulation software.The influence of traditional drive circuit and bridge drive circuit on emission performance is compared and analyzed.Then,for the three-stage reluctance coil electromagnetic launcher,the advantages of the bridge drive circuit in the multi-stage reluctance electromagnetic launcher is analyzed.On the basis of the above analysis,the influence of the time of recovering the residual current of the drive coil and the discharge position of the capacitor on the launch performance is studied.By comparing the simulation results,it is concluded that the launch speed of the projectile and the launch efficiency of the launcher can be improved by reasonable optimization parameters.By the method of step-by-step optimization,the time of recovering the residual current and the discharge position of the capacitor of the three-stage reluctance coil electromagnetic launcher are optimized.Finally,combined with the existing conditions of the laboratory,a single-stage reluctance coil electromagnetic launcher experimental platform based on the bridge drive circuit is built to verify the feasibility of the bridge drive circuit in the reluctance coil electromagnetic launcher.In the experiment,the launch performance of the recovery drive coil at different times is compared to verify the effect of optimizing the time of recovering the residual current on the launch efficiency.In summary,the bridge drive circuit designed in this paper can effectively avoid the influence of the residual current of the drive coil in the reluctance coil electromagnetic launcher and improve the speed of the projectile and the launch efficiency of the launcher.The energy of the residual current of the drive coil is recovered and stored in the capacitor as the initial voltage emitted in the next cycle,which reduces the loss of system energy and is beneficial to the continuous emission of the reluctance coil electromagnetic launcher.