Use air-core-coil resistance to estimate inductance

摘要

This Design Idea shows how to calculate the inductance of a multilayer air-core coil using only its dimensions and resistance. If you know the dimensions and the number of turns on an air-core coil, you can easily calculate the inductance. With the dimensions in millimeters, the inductance, L, in microhenries is a function of the square of the turns, as the following equation shows: L=0.008×D~2×N~2/ (3D+9h+10g), where D is the average diameter of the coil; h is the height of the coil; and g is the depth of the coil-all in millimeters .