Re: [TCML] Inductor design program?

[jimlux <jimlux@xxxxxxxxxxxxx>]

jhowson4@xxxxxxxxxxx wrote:
> I am confused. You are basing your turns and thus your inductance off
> your initial voltage or turns / volt, etc. then you decide a wire
> gauge based on what current you want. When do you make the connection
> between inductance and voltage as to actually know what the current
> will be vrs. what you want it do be?

inductance is determined only by core material, size, and number of turns.

Turns has a minimum bound because of core saturation.

So the first problem is to get the number of turns you need for the 
desired inductance.  You can do this pretty easily by test.. if you have 
a good inductance meter or test setup, you could use some smallish wire, 
wind the 100 or so turns, and add/remove turns to hit the desired 
inductance.

Then, rewind with the wire that's heavy enough to handle the current.

Or, just use some empirical advice like you've received here, wind it 
with the final wire, and adjust turns that way.  This is how most folks 
do it, because the wind with small wire and then rewind with big wire 
takes longer than the pain in the rear-ness of working with AWG 6 or 8 wire.

The other thing to be aware of is that if you're building a current 
limiter, there's both a resistance and inductance component.  The former 
is affected by the wire size, so empirical adjustment as previously 
described is a good way to do it.

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