User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0
Em 10/12/2017 08:22, phil escreveu:
All,
I'm currently assisting in the construction of a ring type toroid (60"
x 12") consisting of six tubes (
https://www.flickr.com/photos/33962508@N03/ ). Using Dr. Antônio
Carlos M. de Queiroz's 'Inca' program (
http://www.coe.ufrj.br/~acmq/programs/ ) and, along with some help in
its actual use from Bert Hickman, I now have a good idea of the
expected toroid's capacitance.
Now the six rings or hoops obviously need supporting in free space,
and the conventional toroid method is a solid central disc in the
horizontal plane supporting the outside minor diameter tube.
I wondered just how much this solid central disc contributes to the
shielding of the secondary, and if its replacement with support arms
(like wheel spokes - but only four of them at 12, 3, 6, 9 o'clock)
would leave the secondary more exposed to strikes, than if a solid
disc had been used?
(The effect on the capacitance value is believed to be small, so left
out of the decision.)
You can use the Inca program to compare the electric field at the top of
the secondary with a solid disk closing the toroid hole and without it.
The difference is very small, unless the hole is very large. You can add
one or two rings (that the program can simulate) along with the radial
arms (that it can´t simulate) to improve the shielding, but the effect
would be mostly mechanical.