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Impedance of iron-core electric coils

机译：铁芯电卷的阻抗

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It can readily be demonstrated that when a low frequency alternating voltage is applied to an iron-core coil the impedance is much higher than the direct current resistance of the coil. To understand how the high level of impedance arises it is necessary to explain how magnetic and electrical induction give rise to a current in the coil that opposes (i.e. is 180 out of phase with) the current generated by the applied voltage. This paper shows how the high impedance can be explained by sequential processes of magnetic and electrical induction, and presents a mathematical derivation of the equation for the current in a coil based on Maxwell's equations. The paper introduces the concept of inductive resistance which, together with inductive reactance, gives rise to the high impedance. The paper also considers the phase angle by which the current in an iron-core coil lags the applied voltage, and concludes that, in the absence of factors causing energy losses and waveform distortions, the lag angle must be less than 45°. It is shown that hysteresis increases the lag angle.
机译：可以容易地说明，当低频交流电压施加到铁芯线圈时，阻抗远高于线圈的直流电阻。为了了解如何利用高水平的阻抗，有必要解释磁性和电感如何引起与所施加电压产生的电流相对的线圈中的电流（即180。本文示出了如何通过磁和电感的顺序过程解释高阻抗，并且基于Maxwell等式提出了线圈中电流的等式的数学推导。本文介绍了感应抗性的概念，与电感抵抗力一起产生高阻抗。本文还考虑了铁芯线圈中的电流滞后的相位角，并且得出结论，在没有导致能量损失和波形失真的因素的情况下，滞后角必须小于45°。结果表明，滞后增加了滞后角。

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