The main characteristic parameters of inductance

The main characteristic parameters of inductance

1. Inductance L and accuracy

The inductance L represents the inherent characteristics of the coil itself, and has nothing to do with the current. In addition to the special inductance coil (color coded inductance), the inductance is generally not specifically marked on the coil, but marked with a specific name. The size of the coil inductance is mainly determined by the diameter of the coil, the number of turns and the presence or absence of an iron core. The purpose of the inductance coil is different, the required inductance is also different. For example, in high-frequency circuits, the inductance of the coil is generally 0.1uH-100Ho

The accuracy of the inductance, that is, the error between the actual inductance and the required inductance, depends on the application. The requirements for the oscillating coil are high, 0.2-0.5%; the requirements for the coupling coil and high-frequency choke coil are low, allowing 10-15%. For some occasions where high inductance accuracy is required, it can generally only be tested with instruments after winding, by adjusting the distance between turns near the edge or the position of the magnetic core in the coil. 

2. Inductive XL

The size of the inductance coil blocking the AC current is called inductive reactance XL, and the unit is ohm. Its relationship with inductance L and AC frequency f is XL = 2πfL 

3. Quality factor Q

Quality factor of the coil

The quality factor Q is used to indicate the size of the coil loss, the high-frequency coil is usually 50-300. The Q value of the coil of the tuning loop is high, and the resonance circuit composed of the coil and capacitor with high Q value has better resonance characteristics; the resonance circuit composed of the coil and capacitor with low Q value has no obvious resonance characteristics. For coupling coils, the requirements can be lower, but there are no requirements for high-frequency chokes and low-frequency chokes. The size of Q value affects the selectivity, efficiency, filtering characteristics and frequency stability of the loop. It is generally expected that the Q value is large, but it is not an easy task to increase the Q value of the coil, so it is necessary to put forward appropriate requirements on the Q value of the coil according to the actual use occasion.

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