Inductor Calculator

by
Wenton L. Davis

An inductor is a coil of wire around some core. Inductance, L (measured in Henries, H), is the measure of a magnetic field created by a current flowing through a coil of wire. The properties of an inductor include:

µ Permeability The permeability is how much the core will allow lines of flux to compress inside of it. It is measured in Henries per meter (H/m). When researching permeability, some tables will show µ while other tables will show µ_r, which is the "relative permeability." The relative permeability is relative to the permeability of a vacuum, µ_o=4πx10^-7=1.2566x10^-6.

N Number of turns The number of turns of wire around the core.

A Cross-sectional area The area of the core as a cross-section, measured in square meters, m²

l Length of the coil The length of the coil, measured in meters, m.
Interesting question: what happens when the length of the coils of wire is significantly less than the length of the core?

L=µN²A/l

Inductor design

Design your inductor based on physical parameters:

Wenton's email (wenton@ieee.org)

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µ:	Core material: Free space; µ_r=1.000 Air; µ_r=1.000 Iron; µ=6.53x10^-3; µ_r=5200 Steel; µ=8.80x10^-3; µ_r=7000 Other: µ= or µ_r=
N:	turns
A:	m²
l:	m

µ	Permeability	The permeability is how much the core will allow lines of flux to compress inside of it. It is measured in Henries per meter (H/m). When researching permeability, some tables will show µ while other tables will show µ_r, which is the "relative permeability." The relative permeability is relative to the permeability of a vacuum, µ_o=4πx10^-7=1.2566x10^-6.
N	Number of turns	The number of turns of wire around the core.
A	Cross-sectional area	The area of the core as a cross-section, measured in square meters, m²
l	Length of the coil	The length of the coil, measured in meters, m. Interesting question: what happens when the length of the coils of wire is significantly less than the length of the core?