Introduction to the main parameters of inductors

Main parameters of inductor

1. Inductance

Inductance L, also known as self inductance coefficient, is a physical quantity used to represent the self inductance ability of an inductive component. When the magnetic flux passing through a coil changes, an induced electromotive force is generated in the coil, which is the phenomenon of electromagnetic induction (knowledge about electromagnetic induction will be learned in the next chapter). The magnitude of the electromotive force is proportional to the rate of magnetic flux change and the number of coil turns. The direction of self induced electromotive force always hinders the change of the original current, just like a coil has inertia, and the magnitude of this electromagnetic inertia is represented by the inductance L. The International System of Units (SI) unit of L, H (Henry), is commonly used as mH (milliHeng) and μ H (Weiheng), its conversion relationship is:

Like capacitors, the inductance of hollow inductors (also known as linear inductors) also depends on their own structure and is not related to whether the coil is energized or the size of the current.

2. Rated current

Usually refers to the DC current value that allows for prolonged passage through inductive components. When selecting inductive components, their rated current value is generally slightly greater than the maximum current flowing through the circuit.

3. Quality factor

The quality factor, also known as the Q value, is represented by the letter Q. A high Q value indicates low loss and high efficiency in the line diagram. For frequency selection circuits, a high Q value is required. In a radio, the Q value is high, the selectivity is good, and it is not easy to cross channel.