Coil inductance

The single -layer coil is around the paper cylinder or the gelberry skeleton with an insulating wire. Such as the crystal radio -waves in the middle wave antenna coil.

1) Impact.

For single -layer cylindrical coil inductance: its inductive value is similar to the number of coils, the diameter of the coil, and the coil length is paired. At the same time, it can be seen that the specific relationship between different L/D ratio is different.

The impact of the inductance on different coil connection methods:

1. The inductance value in the total circuit of different connections is different. When the four coils are connected to the connection, the electrical sensing value is the smallest and the current in the circuit is the largest. Regardless of the current flowing through the current flowing through each coil, or the energy analysis of the energy assigned from the coil, the connection method of the four coil anti -string is the most suitable.

2. For coils with iron hearts, when two coils are placed on the same iron heart, Tiexin will have a decision on the interoperability of the two coils, and because the iron heart is non -linear, its electrical value is not unique. Value under Current is different.

2) Main parameters.

The inductance (inductance coil) is an electromagnetic induction element made of insulating wires (such as lacquer cables, gauze cables, etc.).

Patch power inductance

It is also one of the components commonly used in electronic circuits. The inductance is a series of coaxial coaxial turns made of lacquer bags, gauze cables, or leather lines such as insulating skeleton or magnetic heart, and iron -hearted. It is represented by the letter "L" in the circuit. The signal isolates, filter, or forms a resonant circuit with capacitors, resistors, etc.

The inductance is generally composed of skeleton, winding, shielding, packaging material, magnetic heart or iron heart.

High -frequency patch intimate winding inductance

1. The skeleton skeleton refers to the bracket of the winding coil. Some of the larger fixed inductors or adjustable inductors (such as oscillation coils, streaming circles, etc.), most of them are surrounded by lacquer cables (or gauze cables) on the skeleton, and then loaded the magnetic heart or copper heart, iron heart, etc. into Inner cavity of the skeleton to increase its electrical measurement.

The skeleton is usually made of plastic, glue, and ceramics, which can be made into different shapes according to actual needs.

Small inductor (such as color code inductance)

The inductance generally does not use the skeleton, but directly wraps the lacquer wire to the magnetic heart.

Hollow inductance (also known as the renovation coil or hollow coil, mostly used in high -frequency circuits) without magnetic heart, skeleton, and shielding cover, but before the mold is wound on the mold before taking off the mold, and pulling the coils between the circles of the coils. A certain distance.

2. Winding winding refers to a set of coils with specified functions, which is the basic component of inductance.

The winding has a single layer and multi -layer. There are two forms: a single -layer winding (the wires are circled one circle in a circle when the winding) and the winding (a certain distance between the wires between the wires at the time of the winding); Various types of winding and bee -type winding methods.

3. Magnetic heart and magnetic rod magnetic heart and magnetic rod generally use nickel -zinc iron oxygen (NX series) or manganese zinc iron oxygen (MX series) and other materials. A variety of shapes such as shapes, cans

4. Tiexin Tiexin materials mainly include silicon steel sheets, Poemo alloy, etc., and their shapes are mostly "e".

5. In order to avoid the magnetic field produced by some inductors during working, the magnetic field affects the normal operation of other circuits and components, and adds a metal screen cover (such as the oscillating coil of the semiconductor radio, etc.). The inductance of the shield will increase the loss of the coil.

6. After the packaging material (such as color code inductance, color ring inductance, etc.) is used to wind, the coil and magnetic heart are seized with the packaging material. The packaging material is plastic or epoxy resin.

3) Common coils.

1. Bee room coil

If the wound coil, the plane is not parallel to the rotation surface, but intersects into a certain angle. This coil is called a bee -type coil. And its rotation for a week, the number of times the wires are bent back and forth, often called the number of folding points. The advantage of the bee -type winding method is that the volume is small, the distributed capacitance is small, and the amount of inductance is large. The bee -type coils use the bee house winding machine to wind. The more folding the point, the smaller the distributed capacitance

2. Iron oxygen magnetic core and iron powder core coil

The amount of inductance of the coil is related to whether there is a magnetic core. Inserting the iron oxygen magnetic core in the empty core coil can increase the amount of inductance and increase the quality of the coil.

3. Copper core coil

The copper core coil is used in the ultra -short wave range, and the position of the inductance is changed by using the position of the rotating copper core in the coil. This adjustment is more convenient and durable.

4. Color code inductance coil

It is a high -frequency inductive coil. It is packed by epoxy resin or plastic with epoxy resin or plastic on the magnetic core. Its operating frequency is 10kHz to 200MHz, and the amount of inductance is generally between 0.1UH and 3300UH. The color code electromotor is an inductor with a fixed inductance. Its unit is UH.

5. Flowing ring (stifling circle)

The coil passed by the AC power is called the streaming ring, which is divided into high -frequency resistance rings and low -frequency stream circles.

6. Byminton coil

The deflection coil is a load of the output stage of the TV scanning circuit. The deflection coil requirements: The deflection sensitivity is high, the magnetic field is uniform, the Q value is high, the volume is small, and the price is low.

4) Main parameters of inductance.

The main parameters of the inductance include inductance, allowable deviation, quality factor, distributed capacitance, and rated current.

(1) inductance amount

The amount of inductance is also called the self -induction coefficient, which means that the inductors generate the self -induction ability.

The amount of inductance mainly depends on the number of coils (number of turns), winding methods, materials with no magnetic heart and magnetic heart, and so on. Generally, the more coils, the more densely the coils of the coil, the greater the amount of inductance. The coil with a magnetic heart is more inductive than the coil without magnetic heart; the larger the coil with the magnetic heart conducting percent, the greater the inductance.

The basic unit of inductance is Henry (referred to as Heng), which is represented by the letter "H". Commonly used units also include Jianheng (MH) and Weigheng (μH). The relationship between them is: 1H = 1000mh; 1MH = 1000 μH

(2) Allow deviation

Allowing deviation refers to the permissible error value of the inductance and actual inductance of the inductance.

The inductance requirements in circuits such as oscillation or filtering are generally high, and the allowable deviation is ± 0.2%~ ± 0.5%; and the accuracy of coils for coupling, high -frequency streaming is not high; the allowable deviation is ± 10% ~ 15%.

(3) Quality factor

The quality factor is also called Q value or advantageous value, which is the main parameter to measure the quality of the inductance. It refers to the ratio of sensor resistance to its equivalent loss resistance when working under a frequency AC voltage. The higher the Q value of the inductor, the smaller the loss, the higher the efficiency.

Quality factor Q:

Indicates a physical quantity of the quality of the coil. Q is the ratio of the resistance to the resistance of XL to its equivalent resistance, that is, the higher the Q value of Q = XL/R. , The medium loss of the skeleton, the loss caused by the shielding cover or the core, the impact of the high -frequency skin effect effects. The Q value of the coil is usually tens to one hundred.

The quality of the quality of the inductance is related to the DC resistance of the coil wire, the medium loss of the coil skeleton, and the loss caused by the iron heart, the shielding cover, etc.

(4) distributed capacitance

Distributed capacitors refer to the capacitance between the turns of the coil and the turning of the coil and the magnetic heart. The smaller the distributed capacitance of the inductance, the better its stability.

(5) Rating current

The rated current refers to the maximum current value that can be passed when the inductance has a normal work. If the working current exceeds the rated current, the inductor will change the performance parameters due to the heat, and even burn it due to overcurrent.