Inductor classification

Inductors can be divided into fixed inductors and adjustable inductors according to their functions. According to the core material, they can be divided into hollow cores, magnetic cores and iron core inductors. According to their different structures, can be divide into wirewound inductors and non-wire wound inductors. Device. Commonly used inductors are: fixed inductors,adjustable inductors, magnetic balls, color ring inductors, chip inductors, etc.

1.Fixed inductor

The fixed inductor is generally composed of a skeleton, a winding, a shield, a packaging material, a magnetic core or an iron core, and a wire is wound around the skeleton to form a coil, and the coil mainly has the following forms.

1) Small fixed inductor

2) High frequency antenna coil. Among them, the magnet antenna line drawing generally adopts a paper tube (also some uses a plastic skeleton), and is wound by a multi-strand wrapped wire.

3) deflection coil

4) Choke coil

2. Adjustable inductor

A adjustable inductor is a commonly used inductor component. It changes the inductance of the coil by changing the relative position of the magnet core and the coil, thereby achieving the purpose of linear compensation.

3. Magnetic beads

Unlike the inductor, which consists of a core and a coil, the bead consists of an oxygen magnet. The magnetic beads convert the AC signal into heat energy, and the inductor stores the AC signal and slowly releases it. Magnetic beads have a large hindrance to high-frequency signals. The general specification is 100Ω/100MHz, and its resistance at low frequencies is much smaller than that of inductors.

4, Color ring inductance

A color-ring inductance is an inductance that is coated on the surface of the inductor with a different color ring representing the inductance. The color ring code is the same as the resistor. The basic unit of the color ring inductance is “micro-henry”, which is usually represented by a four-color ring. The first and second color rings are valid numbers, and the third color ring is a multiplier. The fourth color ring is accuracy. For example, an inductor with a color ring color of “brown, black, gold, gold” has an inductance of 1 μH and an error of ±5%.

5, Chip inductor

Chip inductors are mainly of two types, would-type and stacked type. The wound-type chip inductor is a miniaturization of a conventional wound-type inductor. The stacked-molded chip inductor is fabricated by a multilayer printing technique and a lamination process, and is much smaller than a wound-type chip inductor.

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