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Inductor Coil Basics_Inductance Coil Main Performance Index_Inductor Coil Category

Inductor coil
- basic knowledge
The inductor works by the principle of electromagnetic induction. When a current flows through a wire, a certain electromagnetic field is generated around the wire, and the wire of the electromagnetic field itself will
Inductive action on the wire in the range of this electromagnetic field. The effect on the wire itself that generates the electromagnetic field is called "self-inductance"; the effect on other wires in the electromagnetic field range,
Called "mutual sense".
The electrical characteristics of the inductor are opposite to those of the capacitor, "resistance of high frequency, low frequency". That is to say, when the high frequency signal passes through the inductor, it will encounter a large resistance and it is difficult to pass; while the low frequency signal passes through it.
The resistance presented is relatively small, that is, the low frequency signal can pass through it relatively easily. The resistance of the inductor to the direct current is almost zero.
Resistance, capacitance and inductance, they will have a certain resistance to the flow of electrical signals in the circuit. This resistance is called the "impedance". The inductance of the inductor is used for the impedance of the current signal.
It is the self-inductance of the coil. Inductive coils are sometimes referred to as "inductors" or "coils", which are denoted by the letter "L". When winding an inductor, the number of turns of the coil is generally referred to as the coil. "匝".
II. Main performance indicators
The performance index of the inductor is mainly the amount of inductance. In addition, the wire of the wound inductor generally has a certain resistance. Usually, this resistor is small and can be ignored.
But when the current flowing in some circuits is very large, this small resistance of the coil can not be ignored, because a large coil will consume power on this coil, causing the coil to heat up or even burn out.
In some cases, we must consider the electric power that the coil can withstand.
III. Category
There are several types of inductive coils commonly used in circuits: if they are divided according to the material of the coil core used in the inductor, there are core inductors, copper inductors, ferrite inductors, and hollow inductors. Etc.; if divided according to the winding method of the inductor coil, there are single-layer coil, multi-layer coil, close-wound coil, inter-winding coil, tire-removing coil, honeycomb line
Circle, chaotic winding, etc.; and according to the use of the inductor in the circuit, there are oscillating coils, choke coils (flow blocking coils), filter coils, etc.

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