Re: how to calculate turns reqd for chokes?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Larry,

See the formulas at:

http://home.earthlink-dot-net/~electronxlc/formulas.html

http://home.earthlink-dot-net/~electronxlc/formulas.html#helic

L=(NR)^2/(9R+10H) is accurate to with a percent and we all use it for
everything.  But this is for an air core inductor.  If you have a core you
may have to worry about saturation and other things but L is proportional
to n^2.  I just cheat and wrap a few turns to test the core and then go
from there ;-)  I'll let the true transformer design experts here take it
beyond this.

Cheers,

	Terry


At 06:38 PM 7/18/2002 +0000, you wrote:
>Are there simple formulas available to calculate the number
>of turns required to create a choke of a specific value?  I'd like
>to read something on the subject that i could absorb to help me, but I'm not 
>sure where to look.  I recently posed a question about inductive current 
>limiting and the most specific answer i received
>was the inductive reactance formula. (xc=2piFL)  Although that was helpful, 
>it still leads me with the basic question of ... I have x material which is 
>an (EI or toroid, etc) core of n size, how many turns of wire and what size 
>gauge are required.  from the little research I've done,  a handful of 
>variables are needed and some calculus...
>I can handle that.
>
>plus a knowledge of inductance would be very helpful...
>i could build/design
>* chokes for current limiting, chokes for filtering,
>* chokes for inductance matching of NST to other NSTs (i think u
>  could do that.) or to tank capacitor.
>* build my own KICKA** Xfmr.
>
>maybe i should change my major from cs to ee/me. this stuff is fun.
>
>any thoughts??
>larry d.
>
>