What are the basic parameters of inductors

Time：2020-11-10 16:00:44     From：Sorede

What are the basic parameters of inductors

Hello everyone, do you know about inductors? I'll give you an explanation.

The main parameters such as factor, inductance, capacitance and so on.

Inductance

Inductance, also known as self inductance coefficient, is a physical quantity that represents the self induction ability of inductor.

The inductance of inductor mainly depends on the number of coils (turns), winding method, whether there is magnetic core and the material of magnetic core. Generally, the more the number of coils and the denser the coils, the greater the inductance. The inductance of a coil with a magnetic core is larger than that of a coil without a core, and the greater the permeability of the core, the greater the inductance.

The basic unit of inductance is Henry (Henley for short), which is represented by the letter "H". The commonly used units are millihenge (MH) and microhenge (μ h)
1H=1000mH
1mH=1000μH
Allowable deviation
The allowable deviation refers to the allowable error between the nominal inductance on the inductor and the actual inductance.
Generally, inductors used in oscillation or filtering circuits require high accuracy, with the allowable deviation of ± 0.2% ~ ± 0.5%; while the inductors used for coupling and high frequency resistance current are not required with high accuracy, and the allowable deviation is ± 10% ～ 15%.

Quality factor, also known as Q value or merit value, is the main parameter to measure the quality of inductor.

It refers to the ratio of inductance and equivalent loss resistance of inductor when it works at a certain frequency AC voltage. The higher the Q value of the inductor, the smaller the loss and the higher the efficiency.

The quality factor of the inductor is related to the DC resistance of the coil conductor, the dielectric loss of the coil frame and the loss caused by the core and shield.

Distributed capacitance refers to the capacitance between turns, between coil and core, between coil and ground, between coil and metal. The smaller the distributed capacitance, the better the stability. Distributed capacitance can increase the equivalent energy dissipation resistance and quality factor. In order to reduce the distributed capacitance, it is commonly used to use wire wrapped or multi strand enameled wire, and sometimes honeycomb winding method is also used.

Rated current

Rated current refers to the maximum current value that the inductor can bear under the allowable working environment. If the working current exceeds the rated current, the inductor will change its performance parameters due to heating, and even burn out due to over-current.

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