Re: Problems with SRSG on TC

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Rob Judd by way of Terry Fritz <teslalist-at-qwest-dot-net>" <canska-at-a5-dot-com>

Sounds to me like the motor is slowly slipping sync. I've noticed with my
SRSG that if I set the variac about 10 volts too low (from where it solidly
maintains sync) the rotor will slowly slip from pole to pole. The rate of
spin when this occurs does not seem to be steady (not exactly 3599 or
similar rpm). It tends to stick at the poles, where the rpm is probably very
nearly 3600, and the motor sounds 'happy'. Then as it slips to the other
pole it sounds 'unhappy', the motor is straining to regain sync, and it
flips to the other pole rather quickly (the rpm is probably dropping well
below 3600).

So, if you're running on a variac at lower than the normal operating
voltage, trying cranking it up another 10 volts or so. If you're already at
full voltage, you probly need to remove more material from the armature.
Thats my guess :-)

Rob Judd - canska-at-a5-dot-com



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, July 01, 2003 7:23 AM
Subject: Re: Problems with SRSG on TC


 > Original poster: "Steven Ward by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<srward16-at-hotmail-dot-com>
 >
 > Did YOU make the motor synchronous?  Maybe its loosing sync or just isnt
 > modified correctly (like its running a 3599 rpm rather than 3600 rpm).
 > Though thats seems unlikely, i cant figure what else would cause operation
 > to swing in and out like that.  Are you using safety gaps? I hope so!  Im
 > also guessing you have tried to play with the phasing?  But then again,
 > that should not make operation seem so strange.
 >
 > Steve Ward
 >
 >
 > >From: "Tesla list" <tesla-at-pupman-dot-com>
 > >To: tesla-at-pupman-dot-com
 > >Subject: Problems with SRSG on TC
 > >Date: Mon, 30 Jun 2003 20:10:26 -0600
 > >
 > >Original poster: "Zagarus Rashkae by way of Terry Fritz
 > ><teslalist-at-qwest-dot-net>" <arbitrarily_random-at-yahoo-dot-com>
 > >
 > >Hi all,
 > >
 > >I recently completed an SRSG that runs at 3600 RPM
 > >with a 1/4 inch by 7.5 inch dia Lexan disk, with 4
 > >stainless steel electrodes for 240BPS. I use a MOT
 > >stack running at about 2kVA and a 38nF cap. Secondary
 > >is 1000 turns or so of 22AWG on 4 inch SCH 40 PVC.
 > >Toroid is 4 by 16. I don't know what is wrong with my
 > >TC but it only sparks intermittently, and I think this
 > >is due to my RSG. Any clue as to what causes this?
 > >
 > >The TC outputs 3 foot sparks at best, falling short of
 > >the 3.5-4 feet that I got from an air blast single
 > >gap. It goes "zzzt..." and quits, then after another
 > >20 seconds or so it goes "zzzz..." for about 5
 > >seconds, etc...
 > One thing that I never noticed before was that when
 > running at 3kVA or so the cap's saftey gap fired,
 > sounded like a gun firing many times per second.
 >
 > Thanks in advance,
 >
 > Chris
 >
 >
 >
 >