Re: SRSG Question (fwd)

["Tesla list" <tesla-at-xxxxxxxxxx>]

Original poster: Tesla List Moderator <mod1-at-poodle.pupman-dot-com>



---------- Forwarded message ----------
Date: Tue, 5 Dec 2000 17:15:26 EST
From: Esondrmn-at-aol-dot-com
To: tesla-at-pupman-dot-com
Subject: Re: SRSG Question

In a message dated 12/4/00 5:15:23 PM Pacific Standard Time, tesla-at-pupman-dot-com 
writes:

<< Original poster: stanmoore-at-mindspring-dot-com 
 
 When reading posts on the sync spark gap, I see references to using a variac 
to
 control the supply voltage to the motor? Is this correct?  After you modify a
 motor to make it synchronous, do you then also control the supply voltage to
 achieve sync speed?  I am planning make an 1800 rpm sync motor.
  
  
 Also are variacs used on the supply to a NST, say a 15/30?
  
  
 Thanks,
  
  
 Stan
  >>

Stan,

I use variacs to control the power to the transformers, some folks don't.  It 
makes things much easier to tune at low power and then go to full power when 
you are satisified that everything is in order - tuning, coupling, etc.  I 
also have a variac feeding power to my new sync gap motor.  I was concerned 
about throwing full power to it and causing torque on the rotor that might 
cause the electrodes to hit - which would be very bad.  This may not be a 
real problem if the electrode spacing is set wide enough.  I was also 
intrigued by the idea of getting some small phase angle adjustment on the 
motor by using a variac.  Someone reported that a few degrees is possible.

Ed Sonderman