Torroid and sphere terminal magnetic/eddy loss (fwd)

---------- Forwarded message ----------
Date: Thu, 18 Dec 1997 06:29:15 -0700
From: Scott Stephens <stephens-at-enteract-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Torroid and sphere terminal magnetic/eddy loss

It has occured to me, (as other's no doubt) that torroids may be better than
spheres, in part, because the concentrated flux that exits the secondary
solendoid induces eddy current losses in a sphere; where with a torroid, the
flux does not cut the conductor.

This could have the effect of cutting a section of coil off the top equal to
the squar of the coil diameter.

My hypothesis could be tested by suspending a turn of wire with a lightbulb
between the ends, over the coil to see how much it glows, and by putting an
insulative gap in torroids/spheres. But who wants to cut a slit in their
sphere, or in their torroid? 

The voltage accross the slit would be low (step down transformer link) and
the current high.