Compact pulse generators with soft ferromagnetic cores driven by gunpowder and explosive

Abstract

Compact pulse generators which utilized soft ferromagnets as an initial energy carrier inside multi-turn coil and hard ferromagnets to provide the initial magnetic field outside the coil have been studied. Two methods of reducing the magnetic flux in the generators have been studied: (1) by igniting gunpowder to launch the core out of the generator, and (2) by detonating explosives that demagnetize the core. Several types of compact generators were explored to verify the feasibility. The generators with an 80-turn coil that utilize gunpowder were capable of producing pulses with amplitude 78.6 V and the full width at half maximum was 0.41 ms. The generators with a 37-turn coil that utilize explosive were capable of producing pulses with amplitude 1.41 kV and the full width at half maximum was 11.68 μs. These two methods were both successful, but produce voltage waveforms with significantly different characteristics.

Demagnetization properties study on NdFeB permanent magnets under impact load

“…Talantsev et al [8] also successfully proved the feasibility of using NdFeB materials to realize a complete explosion power system. However, the above research on the demagnetization behavior of sintered NdFeB under impact mainly serves the pulse power generator [9,10]. The problem often ignored in the above research is that the impact of sintered NdFeB materials in the working environment is not always the GPa level.…”