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rotary gap problem
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From: dwight duncan [SMTP:duncand-at-ccsalpha2.nrl.navy.mil]
Sent: Wednesday, February 11, 1998 8:05 AM
To: tesla-at-pupman-dot-com
Subject: rotary gap problem
Hi all,
Mr John Freau made the suggestion of making my stationary electrodes
flat wrt. the rotor disk. I gave this a try and there was a slight
improvement. I also took out every other electrode on my disc to a new
total of 8. The motor is running markedly faster and is rated at 2400 rpm
and is of the brushed variety. Still my safety gaps are still firing
almost continually.
My supply consists of two 5 Kv 300 ma transformers put in series with
the center or commons on the HV side grounded. This gives me 10 Kv at 300
ma. Just after the transformers are 4 nf caps in parallel to ground on
each side of the output. next is a laminated iron core common mode choke
with each side at 4 mH. Finally is the safety gap with a ground post in
the center and it was set so it would not fire when the feeds were
disconnected from the tank.
John mentioned the problem may be in the toroid. Using the statement
from Richard Hull I went for as large of a toroid that I could make. I is
a 16" dia. disc with a 4" aluminium dryer hose wrapped around the OD. I
did an order of magnitude calculation and came up with 25 pf. This
calculation made some assumptions that may not be valid.
Anyway this is my whole system and I am running out of ideas for the
cause of this problem and to John or anyone that might have some insight
please reply and any or all comments are greatly appreciated.
PS. The secondaries resonance is measured at 220 KHz and the primary is
tapped out at almost five turns. My tank capacitance is .08 micro F.(from
Maxwell)
Thanks,
Dwight