Abstract
A compact explosively driven ferromagnetic generator (FMG) is developed for seed power source of helical magnetic flux compression generator (HMFCG). The mechanism of FMG is studied by establishing a magnetoelectric conversion model. Analytical calculations and numerical simulations are conducted on the magnetostatic field of open-circuit magnet in FMG. The calculation method for the magnet’s cross-sectional magnetic flux is obtained. The pulse sources made of different materials and equipped with different initiation modes are experimentally explored. Besides, the dynamic coupling experiments of FMG and HMFCG are carried out. The results show that, N35 single-ended and double-ended initiating FMGs have an energy conversion efficiency ηt not less than 14.6% and 24.4%, respectively; FMG has an output pulse current not less than 4kA and an energy of about 3J on 320nH inductive load; HMFCG experiences energy gains of about 2-3 times. FMG and HMFCG can be coupled to form a full-blast electrical driving pulse source.
Highlights
High power pulses are widely used in high energy density physics
The mechanism of compact ferromagnetic generator (FMG) is explored, and the analytical calculations and numerical simulations are conducted on the magnetostatic field of open-circuit magnet
Based on the experimental study of FMG made of different magnet materials and equipped with initiating modes and the dynamic coupling performance of FMG and helical magnetic flux compression generator (HMFCG), the following conclusions are drawn: (1) The difference in discharge response time, current front and full-width-at-half-maximum pulse width of FMG is only within several microseconds, and the peak current deviation is within tens of amperes; the total pulse width of FMG’s output current can reach up to hundreds of microseconds, but the waveform is triangle and the pulse width at high-amplitude positions is relatively narrow; when being coupled with HMFCG, the time order shall be precisely controlled
Summary
High power pulses are widely used in high energy density physics. Generation of high magnetic fields and currents by magnetic flux compression generator(MFCG) was developed in the late 1950s, and is still being improved.[1]. The explosive blast wave acts on ferromagnet with conductor coils and induces rapid demagnetization. Electromotive force is generated in the conductor due to rapid changes in magnetic flux of the conductor coils, forming pulse current i in the discharge circuit and providing pulse energy for post circuits. Scholars at home and abroad have conducted relevant research on FMG from the perspectives of theoretical exploration, numerical simulation and experiments. Shkuratov et al.[5,6,7] and Talantsev[8] theoretically studied the mechanism of explosive demagnetization for ferromagnet, and carried out experiments on transverse and vertical blast wave demagnetizing pulse generators. Lu Feng et al.[9,10] explored the dynamic characteristics of NdFeB under blast wave and analyzed the magnetoelectric conversion theory of FMG. Talantsev et al innovatively tested Nd2Fe14B with an outer diameter of 50.8mm, an inner diameter of 7.6mm and a length of 12.7mm as a seed current for
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