Inductance L
The inductance L represents the inherent characteristics of the coil itself, regardless of the magnitude of the current. In addition to the special inductance coil (color code inductance), the inductance is generally not specifically marked on the coil, but with a specific name.
Inductive reactance XL
The size of the blocking effect of the inductance coil on AC current is called inductive reactance XL, and the unit is ohm. Its relationship with inductance L and AC frequency f is XL = 2πfL
Quality Factor Q
The quality factor Q is a physical quantity representing the quality of the coil, and Q is the ratio of the inductive reactance XL to its equivalent resistance, I .e., Q = XL/R. The higher the Q value of the coil, the smaller the loss of the loop. The Q value of the coil is related to the DC resistance of the wire, the dielectric loss of the skeleton, the loss caused by the shield or the iron core, and the influence of the high frequency skin effect. The Q value of the coil is usually several tens to several hundreds. The use of magnetic core coils, multi-strand thick coils can improve the Q value of the coil.
distributed capacitance
The capacitance between the turns of the coil, between the coil and the shield, and between the coil and the bottom plate is called the distributed capacitance. The existence of the distributed capacitance reduces the Q value of the coil and deteriorates the stability. Therefore, the smaller the distributed capacitance of the coil, the better. The use of segmented winding method can reduce the distributed capacitance.
Allowable error: the percentage obtained by dividing the difference between the actual value and the nominal value of the inductance.
Nominal current: refers to the amount of current allowed to pass through the coil, usually expressed by letters A, B, C, D and E respectively. The nominal current values are 50mA, 150mA, 300mA, 700mA and 1600mA.