Re: [TCML] Inductor design program?

[jhowson4@xxxxxxxxxxx]

Thanks Scott, DC, and other contributors, 

I guess I shall start out by winding a 140 turn #10 inductor for 30 Amp service. I will tap each layer. 
then I will gap the core until one of the combination's gives me the desired current draw. 

I take it I would be graphing Voltage vrs Current? and the slope is inductance? or is it Current Vrs Voltage. 

Thanks, 
John "Jay" Howson IV 

----- Original Message ----- 
From: "bunnikillr" <bunnikillr@xxxxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Thursday, April 22, 2010 6:42:59 PM GMT -05:00 US/Canada Eastern 
Subject: Re: [TCML] Inductor design program? 

Hey John... 

I was basing the current/wire size on the maximum current I want going 
to the piggie. So lets say I had a non limited transformer i needed to 
ballast to 20 amps, I would then use a #10 or #12 wire. I would still 
wind on the 1 turn per volt to start with. I also would be more apt to 
adjust the gap between the EI cores to fine tune the amperage draw. 

It may be a bit scarey, but you can test the inductor for its full 
amperage limiting by using it as a load on an A/C circuit. Along with an 
amp meter and a variac, you can find the "current" curve of the inductor 
as you ramp up the voltage. Most of the inductors I have made seem to 
be pretty linear in their responce untill saturation of the core 
occurs. At that point ( saturation) the current climb seems more 
exponential 

If you dont want to adjust the EI core gap and keep the core solid, the 
next step would be to start removing winds 1 or 2 at a time untill you 
reach the current you are looking for. IIRC, as you remove winds, the 
current begins to increase..... 


Scot D 



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? 
> 
>Thanks, 
>John "Jay" Howson IV 
> 
> 
> 
> 
> 
> 

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