rotary problem

To: "'Tesla List'" <tesla-at-pupman-dot-com>
Subject: rotary problem
From: Tesla List <tesla-at-stic-dot-net>
Date: Wed, 11 Feb 1998 21:01:10 -0600
Approved: tesla-at-stic-dot-net

----------
From:  Mark S Graalman [SMTP:wb8jkr-at-juno-dot-com]
Sent:  Wednesday, February 11, 1998 4:22 AM
To:  tesla-at-pupman-dot-com
Subject:  Re: rotary problem

  Dwight take the safety gaps and put them at
the transformer outputs instead of after
the chokes, I believe the filter circuit may be
ringing and causing your problem. Also make
sure you chokes aren't coupling to your primary
coil.

Mark Graalman


On Wed, 11 Feb 1998 01:19:25 -0600 Tesla List <tesla-at-pupman-dot-com> writes:
>
>----------
>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
>
>
>

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