[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Toroid size on Big Coils
Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
Well as far as I know giant power=giant topload, no way around it
unless you just take secondary strikes as collateral damage. I'd
start with a 48" (maybe up to 72" depending on power) toroid/sphere
made with smaller 1" dia copper tube (aka electrum without all the
welding, not sure if it won't collapse under it's own weight at 72"
tho). Most toroids I've seen use a minor diameter >= the sec dia.
with the major diameter equal to the sec length (if it's sized right,
5:1 or less) I'd imagine that these ratios hold as the secondary gets
bigger if you want to avoid toasting your secondary.
Mike
----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Wednesday, February 08, 2006 5:06 PM
Subject: Toroid size on Big Coils
Original poster: "MIKE HARDY" <MHARDY@xxxxxxxxxx>
From what I see on the profesional coiling sites, in particular KVA
effects, and Tesla Technology Research, the toroids seem small for
the size of the larger coils. I know the cost of large spun toroids
is prohibatively expensive. In the case of the M-13 magnifier, the
majority of pics, show the discharges comming off the corona ring
and not the toroid. With this coil, and Electrum, many of the arcs
seem to be hitting the secondary. At the Cheesehead teslathon this
past summer, the M-200 of D.C. Cox had several secondary strikes,
one of which severely damaged the sec. He said 'that's what happens
with too small of a toroid. How does one avoid this kind of
catastrophic damage? I'm planning to make a coil similar to DC's
M-150. It uses an 18" form, and I have a 36" spun toroid. I don't
want to destroy my secondary.