Inductance coil is an important part of the inductor. Because the inductor is generally composed of a bobbin, winding (coil), shield, packaging material, magnetic core or iron core, etc.
Inductor is an element 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. Inductance has a certain inductance, it only hinders the change of current. If the inductor is in a state where no current flows, it will try to prevent current from flowing when the circuit is on; if the inductor is in a state where current flows, it will try to hold the current when the circuit is off. Inductors are also called chokes, reactors and dynamic reactors.
Inductance coil is a kind of equipment that uses the principle of electromagnetic induction to work. When the current flows through the wire, a certain electromagnetic field will be generated around the wire, and the wire of the electromagnetic field itself will induce the wire within the range of the electromagnetic field. The influence of the electromagnetic field generated by the wire itself is called "self-inductance", that is, the changing current (chan) generated by the wire itself will produce a changing magnetic field, and the magnetic field further affects the current in the wire; for other wires within the range of this electromagnetic field The effect produced.
The bobbin usually refers to a stent on which a coil is wound. Some large fixed inductors or adjustable inductors (such as oscillating coils, choke coils, etc.), most of which are enameled wires (or covered wires) around the skeleton, and then magnetic cores or copper cores, iron cores, etc. Put the magnetic core, copper core, iron core, etc. into the inner cavity of the frame to increase its inductance.
The skeleton is usually made of plastic, bakelite, ceramic, and can be made into different shapes according to actual needs. Small inductors (such as color code inductors) usually do not use a bobbin, but instead wind the enameled wire directly on the iron core. Air-core inductors (also called external coils or air-core coils, mainly used for high-frequency circuits) do not use magnetic cores, skeletons and shields, etc., but are wound on the mold before taking out the mold and between the coil Pull a certain distance.
"Winding" refers to a set of coils with predetermined functions, which are the basic components of inductors. According to different classification standards, there are single-layer and multilayer windings. There are two types of single-layer windings: closed winding (wires are wound side by side when winding) and indirect winding (wires are separated by a certain distance when winding). Multi-layer windings have layered flat windings and random windings.
3. Packaging materials
After some inductors (such as color code inductors, color ring inductors, etc.) are wound, the coils and magnetic cores are sealed with packaging materials. The packaging material is plastic or epoxy resin.
After understanding the structure of the inductor, let's take a look at the methods that should be followed when replacing the inductor.
When replacing inductors, first consider its performance parameters (such as inductance, rated current, quality factor, etc.) and dimensions that meet the requirements. Several commonly used inductor replacement methods are as follows:
1. Between the small fixed inductor and the color code inductor, the color ring inductor, as long as the inductance and the rated electrical quality are similar to the outline size, they can be directly substituted for use.
2. Although the oscillating diagrams in semiconductor radios are of different models, as long as their inductance, quality factor and frequency range are the same, they can also be replaced with each other.
3. The line oscillating coil in the TV should be selected as much as possible to use products of the same model and specification, otherwise it will affect the working state of the circuit.
4. Deflection yokes are generally used in conjunction with picture tubes and line and field scanning circuits, but as long as their specifications and performance parameters are similar, even if the models are different, they can be replaced with each other.