电枢外置线圈感应型电磁发射器磁场分布与运动特性OA北大核心CSTPCD

To enhance the adaptability of the coil-induction launcher to the shape of the projectile and improve the space utilization by the launcher,an external-armature coil-induction electromagnetic launcher(CIEL)was proposed.Six sets of launcher models under different conditions were established.The influence of the driving-coil inner-diameter and the relative position of the armature on the launcher was studied.Numerical calculation was carried out to solve the magnetic field distribution of the driving coil,and static finite-element-simulation was carried out to calculate the coupling between the driving coil and the armature,and of the force on the armature was theoretically analyzed,and transient finite-element-simulation verification was carried out.The magnetic field calculation results show that the radial magnetic induction intensity inside the driving coil is approximately equal to that outside.The axial magnetic flux surrounded by the external armature is 5.51×10-5-22.04×10-5 Wb,and the axial magnetic flux surrounded by the internal armature is 2.81×10-5-17.39×10-5 Wb.The peak magnetic-induction-intensity outside the driving coil is 5.38×10-3-7.32×10-3 T,and the peak magnetic-induction-intensity inside is 1.57×10-2～1.93 ×10-2 T.The static finite-element-simulation results show that the mutual inductance and mutual inductance gradient between the external armature and the driving coil are about 1.5-3 times greater than those of the internal armature.The transient finite-element-simulation results show that the efficiency of the internal structure is 2.96％-17.57％,and the efficiency of the external structure is 4.94％-19.76％.The magnetic flux enclosed by the external armature is approximately 1.27-1.96 times that of the internal armature.Therefore,while the radial magnetic induction intensity is close,the external armature can obtain greater acceleration force;the magnetic induction intensity outside the driving coil is about one-third of the internal magnetic induction intensity,so the external structure has better electromagnetic protection capability;the energy conversion efficiency of external structures is 12.5％～66.6％higher than that of internal structures,therefore external structures have higher energy conversion efficiency.