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Inductors

Inductors are components that can convert electrical energy into magnetic energy and store it. The structure of the inductor is similar to that of a transformer, but it has only one winding. The inductor has a certain inductance, it only hinders the change of current. If the inductor is in a state where no current is flowing, it will try to block the current from flowing through it when the circuit is on; if the inductor is in a state where current is flowing, it will try to maintain the current when the circuit is off. Inductors are also called chokes, reactors, and dynamic reactors.

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Structure
Inductors are generally composed of skeletons, windings, shields, packaging materials, magnetic cores or iron cores.

Inductance classification
Self-inductor
When current flows through the coil, a magnetic field is generated around the coil. When the current in the coil changes, the surrounding magnetic field also changes accordingly. This changing magnetic field can cause the coil itself to generate induced electromotive force (induced electromotive force) (electromotive force is used to represent the terminal voltage of the ideal power supply for active components). It’s self-induction.
It is an electronic component that is wound with a wire and has a certain number of turns, which can produce a certain amount of self-inductance or mutual inductance. It is often called an inductance coil. In order to increase the inductance value, improve the quality factor, and reduce the volume, iron cores or magnetic cores made of ferromagnetic materials are often added. The basic parameters of inductors include inductance, quality factor, inherent capacitance, stability, current passing and frequency of use, etc. The inductor composed of a single coil is called a self-inductor, and its self-inductance is also called the self-inductance coefficient.

Transformer
When two inductance coils are close to each other, the change of the magnetic field of one inductance coil will affect the other inductance coil, and this effect is mutual inductance. The magnitude of the mutual inductance depends on the degree of coupling between the self-inductance of the inductance coil and the two inductance coils. The components made by this principle are called mutual inductors.

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More application

Low-voltage transformers below 600V become low voltage transformer. A low-voltage transformer is a device that is composed of a primary coil, a secondary coil, and an iron core (magnetic core), and changes the voltage through electromagnetic induction. In electrical equipment and wireless circuits, it is often used for voltage rise and fall, impedance matching, and safety isolation. The main functions of the transformer are: voltage transformation; current transformation, impedance transformation; isolation; voltage stabilization (magnetic saturation transformer) and so on.