涡流损耗对爆炸去磁脉冲发生器输出性能的影响

 为了提高爆炸去磁脉冲发生器的输出能量，设计了绝缘层截断涡流回路磁体结构，以减小冲击去磁过程中磁体内产生涡流造成的能量损耗。把圆柱形钕铁硼磁体切分成4块，在块与块之间增加聚脂绝缘层，再组合成一个圆柱形整体，形成截断涡流回路的磁体结构。采用Maxwell 3D电磁场有限元分析软件，对未切分和切分后的钕铁硼磁体进行了静磁场计算，分析了两种结构下的磁感应强度分布。对这两种磁体结构的脉冲发生器进行了爆炸实验，测量了脉冲发生器输出的感生电动势，分析了涡流损耗对发生器输出电流的影响。结果表明：磁体中截断涡流回路的脉冲功率发生器涡流损耗较小，能够输出更大的电能。

Effect of Eddy Current Waste on the Output Performance of the Explosive-Driven Ferromagnetic Generators

For increasing the output energy of the explosive-driven ferromagnetic generators,a new structure of ferromagnetic element has been designed to reduce the eddy current waste.The cylinderical Nd2Fe14B rare-earth magnet was cut into four separate parts,and the insulated layers were placed between magnet parts for keeping them insulating from each other.And then the four magnet parts with insulated layers were combined together again to form a new cylinder.The magnetic field calculations of the magnet cylinder and the cylinder with insulated layers were conducted by the Maxwell 3D code of the electromagnetic analysis software.The initial magnetic flux distribution of two types of cylinders were obtained.The detonation tests of ferromagnetic generators were carried out,and the electromotive forces of ferromagnetic generators were measured.The results show that the eddy current waste of the generator with insulated layers is lower than the generator without insulated layers,and the output energy of the former is higher than that of the latter.