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The size of the inductance is determined by the diameter of the inductor, the number of turns, and the material of the intermediate medium. The error between the actual inductance and the nominal value of the inductance is called the accuracy of the inductance. Choose the appropriate accuracy according to the actual needs to avoid unnecessary waste.

In general, the inductance used for oscillation requires high accuracy, while the inductance used for coupling or choking requires low accuracy. For some occasions that require high inductance accuracy, it is generally necessary to wind it by itself and test it with an instrument, by adjusting the number of turns or The position of the magnetic core or iron core in the inductor is realized.

The basic unit of inductance is Henry, abbreviated as Henry, represented by the letter “H”. In practical applications, millihenry (mH) or microhenry (μH) is generally used as the unit.

The relationship between them is: 1H=103mH=106μH. The inductance is expressed by the direct standard method or the color standard method. In the direct standard method, the inductance is directly printed on the inductor in the form of text. The method of reading the value is similar to that of the chip resistor.

The color code method not only uses the color ring to indicate the inductance, and its unit is microhenry (μH), the inductance represented by the color code method has a larger resistance than the color code, but the meaning of each color ring and the method of reading the electrical value are all It is the same as the color ring resistance, but the unit is different.

The quality factor is represented by the letter Q. Q is defined as the ratio of the inductive reactance presented by the coil to the DC resistance of the coil when the coil is working under a certain frequency of AC voltage. The higher the Q value, the higher the efficiency of the inductor.

The rated current is also called the nominal current, which is the maximum allowable current through an inductor, and is one of the important parameters that must be paid attention to when using an inductor.

Different inductances have different rated currents. When choosing an inductor, pay attention that the actual current flowing through it must not exceed its rated current value, otherwise the inductor may burn out.