Question

In: Electrical Engineering

考虑具有小间隙的磁芯。一旦达到磁饱和,增加绕组中的电流会产生什么影响? 一个。间隙中的磁场将增加,但核心中的磁场不会。 湾 间隙中的磁场不会改变。 C。磁铁可能过热,导致磁场较低 d。核心中的磁场将增加,但间隙中的磁场不会。

考虑具有小间隙的磁芯。一旦达到磁饱和,增加绕组中的电流会产生什么影响?

一个。间隙中的磁场将增加,但核心中的磁场不会。

湾 间隙中的磁场不会改变。

C。磁铁可能过热,导致磁场较低

d。核心中的磁场将增加,但间隙中的磁场不会。

Solutions

Expert Solution


在没有磁场的情况下,芯材料中的磁畴指向随机方向。当施加磁场时,它会使磁畴转向所以它们指向相似的方向。当磁性材料饱和时,所有的磁畴都完全排成一列,没有它们可以去的地方。

由于磁畴不能移动,基本上磁芯不再像磁性材料那样,而是留有空气芯。在电压足够高以引起饱和的时间期间,初级电感急剧下降。当发生这种情况时,唯一限制电流的是微小的初级电感,漏电感和绕组电阻。在电流波形饱和的部分期间,初级电流迅速上升。您可以将其视为波形上的失真。

我在迟滞控制器中有一个电感饱和。当我看着通过它的电流时,我可能会发现三角波的峰值会发出奇怪的波形。如果这个电流足够高,它可以产生足够的热量来熔化绕组。我看到过这种情况
 

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