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The inductance coil is composed of a circle by a wireenclosure around the insulating pipe, wire insulation of each other, and the insulating tube can be hollow, can also contain iron or magnetic

Powder core, referred to as the inductance. With L said, unit(H), Henry Henry (mH), Wahenry (uH), 1H=10^3mH=10^6uH.

Frist, inductor classification

According to the classification of the inductance forms: fixed inductor, variable inductance.

According to the classification of the magnetizer properties:air core coil, ferrite coil, iron core coil, copper core coil. 

According to the classification of the nature of the work: the antenna coil, oscillator coil, choke coil, wave trap coil,deflecting coil. 

According to the classification: single coil winding structure,multilayer coil, honeycomb coil. 

Second, the main characteristic parameters of the inductor coil

1, the inductance L

Coil inductance L represents the inherent characteristics, regardless of the current size. In addition to a dedicated inductor (color code inductance), the inductance is generally not specifically marked on the coil, and the name of a particular label.

2, the inductive reactance XL

Hinder the inductance coil of AC current size inductance XL,ohms. The relationship between it and the inductance L andthe frequency of the alternating current of F PI for XL=2 fL 

3, the quality factor Q

Quality factor Q is a physical quantity showing the coil mass, Q is the inductive reactance XL of the ratio of resistance equivalent thereto, namely: Q = XL / R

The higher the Q value of the coil, loss of the smaller loop. DC resistance and the Q value of the coil wire, dielectric loss skeleton, shield or core loss caused,high frequency skin effect of other factors. Q value of the coil is generally several tens to several hundreds.

4, the distributed capacitance

Between the turns of the coil, between the coil and the shield exists between the coil and the bottom plate is called the distributed capacitance of the capacitor. There is distributed capacitance of the coil Q value minus small, stability is deteriorated, and thus the distributed capacitance of the coil as small as possible.

Third, the common coil

 1, single coil

Single coil is a coil to an enclosure around the paper orbakelite skeleton insulated wire. Such as the       transistor radiowave antenna coil.

2, honeycomb coil

If the coil winding, the plane is not parallel with the plane of rotation, but intersect at a certain angle, the coil is calledhoneycomb coil. And the rotation of one week back and forth, wire bending, often referred to as the breakpoint. The advantages of honeycomb type winding is small in size, small distributed capacitance, and large inductance.Honeycomb coil is the use of the honeycomb winding machine winding,break point more, the smaller the distributed capacitance

3, the ferrite core and iron core coil
  Inductance coil size and presence of the core related. Insert ferrite cores in the air-core coil, increase the inductance and increase the quality factor of the coil.

4, copper coil

Copper coil more applications in the VHF range, the use of rotating copper position in the coil to change the inductance, this adjustment more convenient, durable.5, color code inductor

Color code inductor is an inductor with a fixed inductance, the inductance resistor to sign the same way as with color ring marks.

6, choke coil (choke)

Restrictions alternating current through the coil, said choke coil, sub-high-frequency and low-frequency choke coil choke ring.

7, the deflection yoke

Deflection coil is a TV scan circuit output stage load, deflection coil requirements: high deflection sensitivity, uniform magnetic field, Q value is high, small size, low price.

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