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rotary problem


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From:  Jeffrey Wiggins [SMTP:jwiggins-at-kcc-dot-com]
Sent:  Wednesday, February 11, 1998 8:10 AM
To:  'Tesla List'
Subject:  RE: rotary problem

Dwight,

If I read your post correctly, your problem is the location of your safety gaps.
Place the safety gaps AT the transformers BEFORE the chokes/caps - the way it's arranged now, your safety gaps ARE your main gap!

My two cents.

JDW


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From:  Tesla List[SMTP:tesla-at-pupman-dot-com]
Sent:  Wednesday, February 11, 1998 2:19 AM
To:  'Tesla List'
Subject:  rotary problem


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From:  dwight duncan [SMTP:duncand-at-ccsalpha2.nrl.navy.mil]
Sent:  Tuesday, February 10, 1998 6:46 AM
To:  tesla-at-pupman-dot-com
Subject:  rotary 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 is 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.

Thanks,

Dwight