Direct current magnetic potential fully offsetting inductor

The invention discloses a direct current magnetic potential fully offsetting inductor for filtering a direct current system. The characteristics of the inductor remarkably different from the other direct current inductor are that: the direct current magnetic potential generated in a coil can be basically offset; the structure comprises the following components: a coil, a magnetic core structure, a magnetizer, a permanent magnet, a fixing device and an air gap, wherein the length and shape of the air gap can be randomly set so as to obtain different inductance characteristics. The permanent magnet is placed at the outside of the inductor structure and is in inclined contact with the magnetic core structure; through regulating the initial magnetic potential of the permanent magnet, the directions of a magnetic flux Phi e generated by the direct current component of the coil current and the magnetic flux Phi m generated by the permanent magnet are opposite, so that the direct current magnetic potential can be fu