Inductor structure

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Inductor structure

The inductor is generally composed of a skeleton, a winding, a shield, a packaging material, a core or a core.

1. Skeleton The skeleton refers to the bracket that winds the coil. Some large fixed inductors or adjustable inductors (such as oscillating coils, chokes, etc.), most of them are wrapped around the skeleton of the enameled wire (or yarn wrapped wire), and then the core or copper core, iron core, etc. Load the inner cavity of the skeleton to increase its inductance. The skeleton is usually made of plastic, bakelite or ceramic, and can be made into different shapes according to actual needs. Small inductors (such as color code inductors) generally do not use a skeleton, but directly wrap the enamel wire around the core. Hollow inductors (also known as tire coils or air-core coils, mostly used in high-frequency circuits) do not use magnetic cores, skeletons, and shields. Instead, they are wound on the mold and then removed from the mold. Open a certain distance.

2. Winding Winding refers to a group of coils with defined functions, which are the basic components of an inductor. The windings are divided into single layers and multiple layers. The single-layer winding has two forms of tight winding (one turn of the wire during winding) and inter-winding (each wire is separated by a certain distance between windings); the multilayer winding has layered flat winding and chaos Winding, honeycomb type winding and so on.

3. Magnetic core and magnetic rod core and magnetic rod are generally made of nickel-zinc ferrite (NX series) or manganese-zinc ferrite (MX series). It has “work” shape, column shape, hat shape and “E”. Shapes, cans and other shapes.

4. Iron core The core material mainly includes silicon steel sheet and permalloy, and its shape is mostly “E” type.

5. Shield To prevent the magnetic field generated by some inductors from affecting the normal operation of other circuits and components, a metal screen cover (such as an oscillating coil of a semiconductor radio) is added. Inductors with shields increase the loss of the coil and lower the Q.

6. Packaging Materials After some inductors (such as color code inductors, color ring inductors, etc.) are wound, the coils and cores are sealed with a packaging material. The packaging material is made of plastic or epoxy resin.