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The reason why the inductor suppresses the current

View: 58006/24/2019  

The working characteristics of the inductor are very similar to the working characteristics of the capacitor pair. There are two main working characteristics: 1. The current cannot be abruptly changed; 2. The current is “directly blocked”. The reason why the inductor has the above two characteristics is that "the inductor stores the magnetic field."



From the Oster experiment, we know that the current generates a magnetic field (to distinguish the other magnetic field, which is hereinafter referred to as the current magnetic field).


When the current is larger, the magnetic field around the current is larger; at the same time, the current coexists with the surrounding magnetic field. When a current flows through the inductor, an inductance field equal to the magnitude of the current field is generated in the inductor. However, the speed at which the inductor generates a magnetic field is slower than that generated by the current magnetic field, which causes the speed of the current magnetic field to be limited by the inductance.


As mentioned above, the magnitude of the current and current magnetic fields is a certain size relationship. Therefore, because the magnetic field of the inductor is slow, the current increase is also slowed down. The logic diagram is as follows:




The conclusion that the inductor suppresses the current change can also be obtained from the following simulation diagram:

As can be seen from the figure, when an inductor is added to the circuit, the current rise in the circuit becomes very slow. But the simulation is just a simple DC circuit, and the inductor has many characteristics in the "DC environment" and "AC environment", which is similar to the working characteristics of the capacitor. Next, I will continue to update the working characteristics of the inductor in DC and AC environments and explain the reasons.


Back to today's theme, in fact, the energy storage of the magnetic field is not so simple. The above explanation is only a simplified statement of the energy storage of the inductor, which can only enhance our understanding of the inductance.


The real energy storage process of the inductor also requires a lot of theoretical knowledge about "charge, electric field, magnetic field". This part of the knowledge will be gradually shared with you in the future.



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