![]() ![]() The resultant effective permeability is much lower, but the air gap is uniformly distributed throughout the whole material. There are magnetic materials, which are made from small particles (mostly based on powder iron, sendust or moly permalloy powder) bound together in such a way as to contain certain percentage of non-magnetic volume in them. The distribution of air gap can be also extended even further. In order to reduce the flux fringing effect and the losses associated with it, in some inductors the gap is distributed into many smaller gaps. ![]() ![]() In such case a so-called “ air core” is used, where the windings are supported by a non-magnetic structure, and the whole magnetic circuit is effectively one big air gap. In some cases the currents are so high that it is very difficult or cost prohibitive to design the inductor with a magnetic core. The magnetic field lines must close through the surrounding air (outside of the winding), so the length of the air gap is comparable with the length of the rod. ![]() For instance, a common design for electronic chokes is to place a winding on a magnetic rod. If operation with high currents is required then the air gap might be very large, so that the magnetic circuit is quite “open”. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |