OUGE shows you how to select the right inductor
The elements capable of inducing inductance are collectively called power inductor. The inductor is the electromagnetic induction element which is wound by an insulated wire, such as enameled wire, sand-covered wire, etc. In an AC circuit, the inductor has the ability to obstruct the current of AC but has no effect on DC, except for the DC resistance of the coil itself.

The inductor coil can be used in AC circuit for blocking, voltage reduction, cross-coupling and load. When the inductance and capacitance match, it can be used for tuning, filtering, frequency selection, decoupling and so on. Today, OUGE will introduce the inductor from three aspects: structure, classification, selection.

1.Structural Features
The inductor generally consists of the bobbin, winding, shielding, packaging materials, core, and so on.

Bobbin
Most inductors loop the cable over the bobbin and load the core into the bobbin for inductance gain. The bobbin is usually made of plastic, bake-lite and ceramic, which can be made into different shapes according to actual needs. Small inductors generally do not use bobbin, but directly wrapped enameled wire on the core. The hollow inductor does not use the magnetic core, bobbin and shielding cover, etc., but first winds the line on the mold and then takes off the mold, and sets the coil apart from each other to a certain distance.

Winding
Winding is the basic component of inductor. The winding is divided into single layer and multi-layer. The single-layer winding has two forms of close winding and interwinding. Multilayer windings are layered flat winding, disorderly winding, etc

Core and Magnetic Bar
The magnetic core and the magnetic bar generally use the nickel zinc ferrite (NX series) or the manganese zinc ferrite (MX series), which has "I" shape, the column shape, the hat shape, "E" shape, the pot shape and so on many kinds of shapes.

Shielding
To prevent the magnetic field generated by some inductors from affecting the normal operation of other components, metal screen covers are added, such as oscillating coils of semiconductor radios. 
Packaging Materials
Some inductors after winding, will be used to seal the coil and magnetic core with packaging materials, such as color code inductor, color ring inductor. The packaging material is plastic or epoxy resin.

2.Classification
Inductors can be divided into hollow inductors and solid inductors.
Inductors can be divided into high-frequency signal inductors, general signal inductors and power inductors.
Inductors can be divided into common inductors, color ring inductors, epoxy inductors, patch inductors, etc. According to the inductance, the inductor can be divided into fixed inductor and adjustable inductor.

3.Factors Should be Considered Before Selecting
Occasion
Pay attention to moisture and dryness, ambient temperature, high and low frequency environments, or impedance characteristics.

Frequency
At low frequencies, inductors generally exhibit inductive characteristics, which are energy storage and high-frequency filtering. But at high frequencies, its impedance characteristics are obvious. There is energy dissipation, heating, reduced perceptual effect and other phenomena. Different inductors have different high-frequency characteristics.

The maximum current to be borne by the inductor design and the corresponding heating conditions.

Pay attention to conductors, such as enameled wire, gauze wrap, or bare conductors. Find the most suitable thread warp.