“磁通浓缩器”无浓缩磁通作用

本文通过解麦克斯韦方程给出了把“浓缩体”插入初级线圈前后的磁场分布。方程的解表明,如果在“浓缩体”插入前后,保持初级线圈中的电流不变,则二者在中空区产生的磁场不变;如果供应M者的能量不变(即C,V固定),则插入“浓缩体”前后场值之比B/B₀∝(R₀)^1/2,但这完全是由于磁场的再分布引起的。这时中空区的总磁通减小,磁通并不守恒,不存在使磁通浓缩的问题,因而用它产生高强脉冲磁场存在着原理性错误。本文指出了把“浓缩器”看作脉冲变压器的错误所在。理论计算还表明用端面为截头圆锥形装置能产生较高场是结构效应所致。 关键词：

NEGATIVE ARGUMENT ON THE EXISTENCE OF FLUX CONCENTRATING EFFECT IN THE FLUX CONCENTRATOR

In this paper, the magnetic field distribution around a coil is worked out by solving the Maxwell equations for both the cases before and after inserting a "concentrating body" into the winding coil. The solution shows that, if we keep the current in the winding coil constant before and after then inserting, then the magnetic field in the hollow region will not change; but if we keep the supplied energy unchanged before and after the inserting (i.e. C, V fixed), then the ratio of magnitude of the field inthe two cases Will be B/B₀∝(R₀)^1/2. The latter effect results, however, completely from redistribution of the field. The total flux in the hollow region is reduced after the inserting, the fluix is not costant, there is not any flux concentrating effect. Hence the expectation of using such an effect to produce pulsed intense magnetic field is misleading in principle.We have also analysed why it is wrong to regard the flux concentrator as a pulse transformer. The theoretical calculation further shows that the increasing of magnetic field obtained by using devices with truncated cone shaped endings is due to the effect of construction.