We call the DC electromagnetic system the constant magnetic potential system, and the AC electromagnetic system the constant magnetic link system. The so-called magnetic potential refers to IN, I is the current, and N is the number of turns of the coil winding. Therefore, in the closing process of the DC electromagnetic system, the coil current does not change much, and the impact on the power supply is naturally small.


In addition, since the magnetic flux of the DC electromagnetic system is stable, eddy currents are not generated in the system, so the iron core and armature of the DC electromagnetic system are all monolithic magnetic steels.

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