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ballast Inductor Choke coil (fwd)
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From: David [SMTP:davmckin-at-ix-dot-netcom-dot-com]
Sent: Saturday, April 04, 1998 2:25 AM
To: Tesla List
Subject: Re: ballast Inductor Choke coil (fwd)
Tesla List wrote:
>
> ----------
> From: ESchulz531 [SMTP:ESchulz531-at-aol-dot-com]
> Sent: Friday, April 03, 1998 5:39 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: ballast Inductor Choke coil (fwd)
>
> WHAT,
>
> N = SQRT (38200 * ((9 * 3) + (10 * 12))/3 * 3)
>
> Then:
>
> N = 1475 turns would be required
>
> Sorry but you are wrong it is 789.895
>
> But you are right about the coil, anybody know the equation for a multilayer
> cylinder coil?
>
> Erik
Dear Erik & All,
The Multilayer Air Core Inductance formula is:
31.6 * N^2 * r1^2
L {uH} = --------------------------
6*r1 + 9*L + 10*(r2-r1)
L{uH} = Inductance in microHenries
N^2 = Total Number of turns on coil Squared
r1 = Radius of the inside of the coil {meters}
r2 = Radius of the outside of the coil {meters}
L = Length of the coil {meters}
Note the similarity to the formula for the single layer
air core coil. Hope this helps everyone.
David L. McKinnon