Re: Help calculating a different electromagnetic coil please...

On Thu, 02 Feb 2006 10:49:43 -0800, WildIrish wrote:

I'm reverse-engineering an electromagnetic coil that's very very small,
made
from very small wire. I'm not an electrical engineer so this is tough,
but I have
some background enough to be dangerous. Some help would be greatly
appreciated.

I know the following: Current flow through the coil, number of wraps, size
of wire,
area of the bobbin it's wound on, length of finished coil.

WHAT I WANT TO DO: determine the correct wire size and coil wrap count to
replicate the same amount of magnetic force as the original coil....
hopefully with less
wraps and hopefully thicker wire to allow me to handle it by hand, the
original
was probably machine wound.

Is there any way to estimate this and avoid all the math, or do I need to
go the calculation route? If I must calculate it, do I calculate to Gauss
for
the orignal one and then solve for number of wraps given specific wire
sizes?
Any suggestion on the formulas to keep it as simple as possible would be
greatly appreciated, I hate to chase my tail when I don't have much
experience in this area.

Thanks again for everyone's help ahead of time!

-B

You could simply measure it. I'm not quite sure how you'd measure
"magnetic force", but once you get that figured out, get ahold of a
current-controlled, variable-voltage bench power supply, and apply
a range of currents to the existing coil, and see what "magnetic
force" you get - it's usually measured in ampere-turns. Then, hand-
wind a coil with your desired wire, and crank up the current until
you get the same magnetic force, which should be at the same ampere-
turns value, if everything else is the same.

Good Luck!
Rich

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