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RE: [TCML] Variable RSG

Let's also make sure that everyone is talking about the same type of motor. When we're talking about a motor for use with a Synchronous Rotary Spark Gap, and "synchronizing" the rotor angular position with the sine wave of the AC power supply, we are usually talking about a "salient pole" type motor, either factory-made (like used in a Teletype machine) or a modified (flats machined on rotor) synchronous induction motor.
   
  Miles' original post dealt with adjusting the phase of a "syncronous" motor, and there was no mention of salient-pole modification.
   
  I've experimented with John Freau's phase adjust circuit using salient-pole motors, and it works as advertised.
   
  However, I've never tried it on an un-modified synchronous motor (conventional squirrel-cage induction motor). Does it work on an regular squirrel-cage motor?
   
  Regards,
  Scott Hanson

"Lau, Gary" <Gary.Lau@xxxxxx> wrote:
  One can use a Variac as a variable inductor, with a motor run cap, to vary the phase of a sync motor. John Freau pioneered this and is described on his web site: http://members.aol.com/futuret/page3.html

But I would first ask - are you really using a 2 HP motor? With what size power supply on your coil? 2HP to essentially turn a switch off and on seems a gross waste of power.

Regards, Gary Lau
MA, USA

> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
> Behalf Of miles waldron
> Sent: Wednesday, April 09, 2008 1:18 AM
> To: 'Tesla Coil Mailing List'
> Subject: RE: [TCML] Variable RSG
>
> Bart,
>
> I hate to be a pest, but is there an electronic way to ajust the phase of a
> syncronous motor? I have a nice two horse power motor does not reach
> synchronization at the same place, by experiment with a phosphor lamp. So I
> need to be able to tweak it around without physically rotating the motor, or
> the contactors.
>
> Science !
>
> Miles Waldron
> 678-557-7737

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