【摘要】 设计并制作了基于没有附加磁芯复位电路的单级、双级磁脉冲压缩系统电路,用于测试Ni-Zn铁氧体磁芯在μs及亚μs级脉冲激励下的动态磁特性。磁芯的磁滞回线由测量到的磁开关两端电压和电流数据经计算得到,由磁滞回线可知磁芯在μs及亚μs级脉冲激励下的各种特性参数如饱和磁感应强度、剩余磁感应强度、矩形比、磁通密度跳变、矫顽力、饱和磁场强度及单位体积材料磁滞损耗;通过比较两块磁芯在μs及亚μs级脉冲激励下的各种动态磁特性参数可知:两块磁芯随激励脉冲宽度变窄磁芯磁性能有不同程度的下降,亚μs级脉冲激励下的矫顽力和单位体积材料磁滞损耗都比μs级脉冲激励下增大约3倍;饱和磁感应强度小、剩余磁感应强度大的Ni-Zn铁氧体磁芯动态磁特性性能优异,适合用于更窄脉冲的压缩电路中。更多还原

【Abstract】 A test circuit was designed and built,which is based on one-stage and two-stage magnetic pulse compression systems without external demagnetization circuits,so as to test the dynamic magnetic characteristic of Ni-Zn ferrite magnetic core under excitation pulses of microsecond and sub-microsecond level.The hysteresis loop of the magnetic core was calculated by tested voltage and current from the magnetic switch,with which various characteristic parameters of the magnetic core under the two kinds of excitation pulses can be easily gained,including saturated magnetic induction intensity,residual magnetic flux density,square ratio,magnetic flux density variation,coercive force,saturated magnetic-field intensity and magnetic hysteresis loss of unit material volume.The comparison of the dynamic magnetic characteristic of two cores,each of which was excited by pulses of microsecond and sub-microsecond level respectively,shows that the narrower excitation pulse brings about the dynamic magnetic characteristic decline for both cores,but with different degrees.The coercive force and magnetic hysteresis loss of unit material volume under sub-microsecond excitation are about four times those under microsecond excitation.更多还原