Inductor (Inductor) is able to convert electrical energy into magnetic energy stored components. The structure of the inductor is similar to a transformer, but it has only one winding. Inductor has a certain inductance, it only hinder the current changes. If the inductor is in the absence of a current flow, it will try to block the flow of current when it is on; it will try to maintain the current if the circuit is open while the current is flowing. Inductors, also known as choke, reactor, dynamic reactor.

Structure
Inductors generally by the skeleton, winding, shield, packaging materials, core or core and other components.

1, skeleton Skeleton refers to the coil around the stent. Some large-scale fixed inductors or adjustable inductors (such as oscillation coil, choke ring, etc.), most of the enameled wire (or wrapped yarn) around the skeleton, and then the core or copper heart, iron core, etc. Into the skeleton of the lumen to increase its inductance. Skeleton is usually made of plastic, bakelite, ceramic, according to actual needs can be made into different shapes. Small inductors (such as color-coded inductors) generally do not use the skeleton, but directly enameled wire wound on the core. Hollow inductor (also known as born coil or hollow coil, used for high-frequency circuit) without the core, the skeleton and the shield, etc., but first around the mold and then take off the mold, and the coil between the coil pull Open a certain distance.
2, winding Winding refers to a set of coils with the specified function, which is an essential part of the inductor. Windings have a single layer and multi-layer points. Single-layer windings are densely wound (wound around the wire in a circle) and around (around every lap when the wire is separated by a certain distance) in two forms; multi-layer winding layered, chaos Winding, hives and other around the law.
3, Core and Magnet The core and magnet are generally made of NiZn ferrite (NX series) or MnZn ferrite (MX series). It has the characters of "Gong", column, hat, "E" Shape, pot and other shapes.
4, the core of the core material mainly silicon steel, permalloy and so on, its shape mostly "E" type.
5, the shield in order to avoid some of the magnetic field generated by the inductor at the work of other circuits and components affect the normal work, to increase its metal screen cover (such as semiconductor radios oscillation coil, etc.). The use of shielded inductors, will increase the loss of the coil, so that Q value decreases.
6, packaging materials Some inductors (such as color-coded inductors, color-ring inductors, etc.) around the system, with the packaging material to seal the coil and core up. Packaging materials such as plastic or epoxy resin.

Copper coil
Inductance is the passage of alternating current within the conductor, the alternating flux is generated around the inside of the conductor, and the ratio of the flux of the conductor to the current producing the flux. When the inductor through the DC current, the only show a fixed magnetic field lines around, does not change with time;