Electromagnetic coil launcher is a kind of special linear motor. In order to study the trigger principles of multi‐stage electromagnetic coil launcher, based on the electromagnetic field theory, the paper deduced the field‐circuit coupling magnetic field control equations of multi‐stage synchronous inductive coil with the consideration of inter‐stage coupling, and analyzed the distribution law of magnetic lines of force, air‐gap magnetic field and current density for multi‐stage electromagnetic coil launcher. The following conclusions were reached: the largest part of magnetic flux was at the intermediate stages of multi‐stage electromagnetic coil launcher; each stage of drive coil compensates for the magnetic field of the upper coil, thus making a stable air‐gap magnetic field; the induced current density was mainly distributed in the tail and surface of the armature; according to anti‐electromagnetic shock design principle of multi‐stage electromagnetic coil launcher (namely, the requirement for small fluctuation of electromagnetic force), the basic principle of multistage trigger was summarized, that is the principle of keeping air‐gap magnetic field and induced current constant. Thus, the design foundation was laid for the operation of multistage electromagnetic coil launcher. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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电磁线圈发射器电磁场的建模与仿真

电磁线圈发射器是一种特殊的线性电动机。为了研究多级电磁线圈发射器的触发原理，基于电磁场理论，推导了考虑级间耦合的多级同步感应线圈的场电路耦合磁场控制方程，并分析了多级电磁线圈发射器的磁力线，气隙磁场和电流密度的分布规律。得出以下结论：磁通量的最大部分是在多级电磁线圈发射器的中间阶段。驱动线圈的每一级都会补偿上部线圈的磁场，从而形成稳定的气隙磁场；感应电流密度主要分布在电枢的尾部和表面。根据多级电磁线圈发射器的抗电磁震设计原理（即对电磁力波动小的要求），总结了多级触发器的基本原理，即保持气隙磁场和感应的原理。当前常数。因此，为多级电磁线圈发射器的运行奠定了设计基础。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。这就是保持气隙磁场和感应电流恒定的原理。因此，为多级电磁线圈发射器的运行奠定了设计基础。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。这就是保持气隙磁场和感应电流恒定的原理。因此，为多级电磁线圈发射器的运行奠定了设计基础。©2021日本电气工程师学会。由Wiley Periodicals LLC发布。