Investigation of Ferromagnetic Generators Based on Shock Waves Demagnetization

摘要

To investigate further the output characteristics of ferromagnetic generators based on the shock-induced demagnetization of magnetic materials, several types of ferromagnetic generators of current pulse generator have been carried out. In the experiments, the Nd_2Fe_(14)B rare-earth high energy hard ferromagnetics of a cylinder or ring structure were used as the work body of energy carrier, the shock waves form the detonation of high explosives passed through the Nd_2Fe_(14)B working body along the direction of the axis or the radius. The influences of the shape of the shock waves from high explosives on the output current performances of the generator were studied. The experimental results show that the generator by both longitudinal and transverse shock wave action is most effective in the aspect of the demagnetization rate. However, for the design it is very difficult to reduce the volume of the device and the amount of high explosives. The ferromagnetic generators designed are capable of producing a high current pulse of up to 1212 A, with the width of 78.3 μs, and the peak power of up to 22.5 kW. In addition, the numerical simulation of the process of the shock wave loading the Nd_2Fe_(14)B working body was conducted. The results from the numerical simulation show that the generator based only on longitudinal shock demagnetization or on transverse shock demagnetization are not completely demagnetized. The analysis of the progress of the shock wave loading is very helpful to design the more optimal device of the generator.