What is an air core inductor?
Most chokes or inductors are constructed by means of encircling the middle leg of a three legged lamination of core steel with a suitable coil winding above the open ends of which a predetermined gap is established and “I” laminations are laid. The fringing which controls the surge or AC is defined by the gap which is established generally through use of a piece of insulating material. Some of the newer Marelco designs do away with the “I” segments and leave the legs of the core open. An air core inductor performs much the same function by means of winding the coil around an imaginary core of air. The current finds it easier to follow the winding than to jump the air in the middle. Surges are absorbed into the winding. When considering the more exotic type of current controls call the Marelco Engineering Department for advice.
