Re: No responses yet! Fw: Air core toroid...

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Michael,

Well, this is what I thought you meant but thought I must have been mixed
up. Regardless of calcs working out or
not, what would be the purpose of this coil? Producing sparks? What did you
have in mind?

Bart Anderson

Tesla list wrote:

> Original poster: "David L. McKinnon by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <DMsHV.DavMcKin-at-verizon-dot-net>
>
> Michael,
>
> Basically, it's just a straight solenoid formed into a circle, and so the
> calcs.
> are all the same. Imagine taking your secondary coil, and forming it into a
> circle, this is exactly what happens.  Wheeler's formula works out very
> close
> even under these conditions! To find the equivalent length of the solenoid,
> take
> the Overall Dia. of the donut and then the diameter of the center portion.
> Add
> these together and then divide by 2.  This gives you the length of the coil.
> This is same length as the regular length normally used in the calcs.  Use
> the
> radius of the cross section as the radius of the solenoid (same as you would
> normally).  Use the typical straight solenoid (wheeler's) formula for calc.
> the
> inductance.  Hopefully I explained this clearly, please e-mail me if I
> didn't, or
> if you have any questions.
>
> David L. McKinnon
> D&M's High Voltage
>
> > > Original poster: "mpf by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > <the_machin_shin-at-hotmail-dot-com>
> > >
> > > I haven't received any responses yet, and was hoping my question was not
> > > forgotten...
> > >
> > >
> > > ----- Original Message -----
> > > From: mpf
> > > To: Tesla list
> > > Sent: Wednesday, May 30, 2001 3:58 PM
> > > Subject: Air core toroid...
> > >
> > >
> > > Curious how the inductance of an air core toroid coil (inductor) would
> > > compare with that of a straight coil...
> > >
> > > Thanks.
> > >
> > > Michael P. F.