LTD用磁芯材料磁化特性实验研究

Experimental study on magnetizing property of magnetic core for LTD

通过比较测量磁化特性的几种方法,采用脉冲电容器快速放电方法,获取了ns级上升前沿的快脉冲,对高频响应比较好、适合于直线型脉冲变压器(LTD)的非晶态合金、硅钢带磁芯进行了快脉冲磁化特性实验。通过测试磁芯在快脉冲下初级电流和开路次级电压,获得了磁芯的磁滞回线;测出了它们在不同的磁感应强度随时间的变化率(dB/dt)时的相对磁导率。试验表明两种磁芯样品的相对磁导率随着dB/dt增大而减小,非晶态合金2605SA1样品磁环在dB/dt大于20 T/μs时,相对磁导率小于1000,硅钢薄带磁芯在dB/dt大于4 T/μs时,相对磁导率小于1000。

This paper studies the pulsed magnetizing property of annealing metglass and silicon steel core with polymer foil between layers fitted to the linear transformer driver（LTD）. The capacitor fast discharge method was used to acquire a pulse with about 20 ns rise time and mearsure the magnetizing properties of annealing metglass 2605SA1 and silicon sted DG6. Through measuring primary current and secondary coil opened voltage, magnetic core hysteresis loops have been drawn. After the experiment, relative permeability was obtained in different dB/dt. The results indicate that the relative permeability is decreased with the increase of dB/dt. The relative permeability of annealing metglas 2605SA1 is less than 1 000 when dB/dt is more than 20 T/μs and that of silicon steel DG6 is less than 1 000 when dB/dt is more than 4 T/μs.