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46483 2008 年 01 月 13 日 01:23 Reading (loading. ..) Comments (0) Category: Personal Diary
Inductors coil wire is looped around a circle by insulating pipe, wire insulation each other, and insulated pipes can be hollow, also contain iron core or magnetic core, referred to as inductance. With L said that the unit has Henry (H), mg Henry (mH), micro-Henry (uH), 1H = 10 ^ 3mH = 10 ^ 6uH.
one inductor inductor in the form according to the classification of
Category: Fixed inductors, variable inductors.
magnet according to the nature of Category: Air Core Coil, Ferrite coil, iron core coil, copper coil.
classified by the nature of work: the antenna coil, the oscillation coil, choke coil, notch coils, deflection coils.
by winding of structure: single-coil, multi-layer coil, honeycomb coil.
Second, the main characteristic parameters of the inductor coil
1, inductance L
coil inductance L that the inherent characteristics, and current size. In addition to a special induction coil (color code inductance), the inductance of the coil is generally not specifically marked, while the name of a particular label.
2, the inductor coil inductance XL
hinder the size of the AC current, said inductive reactance XL, unit is the ohm. It is with the inductance L and the relation between the AC frequency f XL = 2πfL
3, quality factor Q
said coil quality factor Q is the quality of a physical quantity, Q for the inductive reactance XL the ratio of its equivalent resistance, that is: Q = XL / R. The higher the Q value of the coil, the smaller the loop loss. Q value of the coil wire DC resistance,
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4,
distributed capacitance between coil turns and turns, the coil and the shield,
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Three commonly used coil
1,
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single-layer insulated wire coil is wound around to endure around the skeleton in the paper or bakelite. Such as the transistor radio wave antenna coil.
2, honeycomb coil
If the wound coil, the plane is not parallel to the surface with the rotation, but intersect at an angle, such as honeycomb coil coil . And its rotation a week, the number of wire bent back and forth, often referred to as discount points. Honeycomb around the method has the advantage of small size, distribution of capacitance and large inductance. Honeycomb honeycomb coil winding machines are used to around the system, the more discount points, distributed capacitance smaller
3, ferrite core coil and iron core coils
the inductance on the size and whether the core. Inserted in the hollow ferrite core coil, the coil increases the inductance and improve the quality factor.
4,
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more in the VHF range of applications, the use of rotating the position of copper in the coil to change the inductance,
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5,
color code color code inductor inductor inductor is a fixed amount of inductor, the inductance method of the same sign as the color ring resistance to marking.
6, choke ring (choke)
alternating current through the coils limits said choke ring, sub-blocking high-frequency and low frequency choke ring ring.
7, deflection coil
deflection coil is the output stage circuit TV scan load, deflection coil requirements: deflection sensitivity, magnetic field homogeneity, Q value is high,
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