The Modeling And Research Of Linear Drive System Based On Superconducting Pulsed Power Supply

The electromagnetic propulsion system is a new type of linear drive system.Compared with ordinary linear drive systems,the electromagnetic propulsion system has the advantages of simple principles,high operating speed,and good accelerati on performance,so it has good development prospects.According to the principle of the electromagnetic propulsion linear drive system,the drive system consists of a pulse power subsystem and an electromagnetic launch subsystem.The pulsed power subsystem studied in this paper is a pulsed power supply based on the principle of high-temperature superconducting pulsed power transformer?HTSPPT?.This power supply has high energy storage density,high energy transmission efficiency,and high output pulse amplitude,so it is very suitable as a pulsed power supply for electromagnetic drive systems.The electromagnetic emission subsystem is a rail-type electromagnetic emission device that is close to practical applications and researched by many scholars and scientific research institutions.When the rail-type electromagnetic launcher works,the load will change with the armature movement.In the past,most studies used fixed load value.We use Simulink to establish a dynamic load model and an after-load dynamic load model for the electromagnetic emission subsystem to replace the fixed load.The results show that compared with the fixed load,using the dynamic model can more accurately study the discharge characteristics of the pulsed power supply.And We use Simulink to model the single-pulse power subsystem first.Then we connected the two subsystem models to obtain a complete rail-type electromagnetic propulsion linear drive model.We changed some parameters of the drive system powered by a single module pulse power supply and analyzed the performance of different drive systems.The results show that increasing the coupling coefficient will greatly improve the residual energy recovery rate,which is of great significance for reducing the secondary operation time of the equipment.Reducing the inductance L₂ can increase the transmission speed and improve the electromagnetic emission performance of the linear drive system.And increasing the capacitance C can reduce the circuit shutdown voltage,reduce the performance requirements of the circuit breaker,reduce equipment investment,and reduce equipment cost.Because the pulse current energy generated by a single-module power supply is small,we have established a multi-module pulse power supply model.And we have simulated a drive system powered by a multi-module pulse power supply.The results show that the multi-module pulse power supply parallel discharge mode can generate a higher level of current pulses,which can greatly improve the transmission speed.In addition,when exploring the launch performance of the electromagnetic propulsion system,the effects of sliding friction and air resistance should be fully considered,otherwise the error will be large.We use Ansys to build an armature-rail model,and perform a three-dimensional transient analysis of the model.And we studied the current density,Joule heat and electromagnetic force distribution of the armature during the electromagnetic emission process under the pulse power supply based on HTSPPT.The results show that the inside of the armature groove and the outside of the armature tail are two regions where the current density and Joule heat distribution are highly concentrated.The force of the armature in the X-axis direction provides the power of linear motion,and the force in the Y-axis and Z-axis easily cause the armature to deform.