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Re: Choke size?
Original poster: "Gerry Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
Hi Steve,
You will need the cross sectional area of the core, the number of
turns, the length of path thru the core, and any gap width. If no
gap, you will need the permeability of the material. However, you
can measure the inductance by powering the choke up slowly while
monitoring the current using a variac and current meter. Plot the
current vs voltage across the choke. The V/I ratio will be the
impedance (ZL) of the choke at your line frequency. ZL = 2*pi*freq*L. So,
L = (V/I) / (2*pi*freq)
Gerry R.
Original poster: "Steve Studer" <reddykguy@xxxxxxxxxxx>
Does anyone know of a formula for calculating the inductance of a
choke with an iron core? I have 4 chokes the size of large mot's
they have about 30 turns of .250" flat copper wire. I cannot seem
to find any formulas except for air core formulas. I would like to
use two of these for a DC resonant power supply. I just don't have
any idea what the inductance might be.
Thanks,
Steve