Re: Need Formula for length of spiral

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

since the length is essentially integrating a linearly varying function
(radius) there will need to be some squared term in the equation. Granted,
for small enough ranges of parameters, a linear approximation will probably
work.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, February 13, 2002 8:37 PM
Subject: Re: Need Formula for length of spiral


> Original poster: "Steve Stuart by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<sstuart-at-glasscity-dot-net>
>
> Try:
>        L = (Do - Di) / 2 * 1.6 * pi * T
>
> Where:
>        L  = conductor length
>        Do = outside diameter
>        Di = inside diameter
>        T  = number of turns
>
> It will give you a pretty close approximation
>
> 73 de Steve
> ·¸¸·´¯`·¸¸·´¯`·¸¸·´¯`·¸¸·´¯`·¸¸·´¯`·¸¸·
> w8an-at-w8an-dot-net
> http://www.w8an-dot-net
>
> Tesla list wrote:
> >
> > Original poster: "John Tomacic by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <tesla_ownz_u-at-hotmail-dot-com>
> >
> > Hi everyone,
> >
> > Does anyone have a formula that I can use to calculate the length of
wire
> > required in a flat spiral coil? I have the formula for inductance,
however,
> > I really need the wire length.
> >
> > Thanks,
> >
> > John
> > SST coiling in Ottawa.
> >
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