Re: SRSG motor - HELP!!!!!

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

Original poster: "Dale Nassar by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dnassar-at-i-55-dot-com>

I got the same stalling problem because I ground too much FLAT (for a 3450 
to 3600 RPM conversion)  Sometimes with a load it would stall at startup if 
the flats were in the weak spot. I would just turn the power on-off-on and 
it would go (rock out of the bad position).  I have also designed a white 
LED strobe light that syncs with the sine peaks of the AC line.  I use this 
to verify motor sync--works GREAT!!  With white LEDs, no need for a special 
xenon strobe here!
I plan to post procedure, schematics, and photos as soon as I get my 
website up (photronicsresearch-dot-com)
--dale nassar
==================================================

At 11:36 AM 6/9/02 -0600, you wrote:
>Original poster: "Mr Gregory Peters by way of Terry Fritz 
><twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>
>
>Hello all,
>
>Today I was running my coil and getting solid 8 foot arcs, when
>suddenly, and rather destructively, the SRSG motor died. The motor is a
>1HP bench grinder, which I had modified to run in sync. I think it is a
>capacitor run motor. Upon inspection, some of the windings were melted,
>and the entire motor was full of carbon. I saw no reason for it to fail.
>No sparks hit it while operating. It all happened rather suddenly. I
>have had some funny problems with this motor. Often, when applying
>power, it would just sit there and vibrate back and forth, as if it
>didn't know which way to spin. Could this just be because I stuffed up
>when grinding the flats (off centre, unequal size, etc)? Could this and
>the failure be related (was the motor drawing excess current, causing
>the wires to melt etc)? Before I go and buy a new grinder, are these
>motors suitable for this pupose, or are they doomed to fail?. It was
>definitely running in sync ok. Has anyone else successfully used one of
>these motors for sync operation?
>
>Cheers,
>
>Greg Peters
>Department of Earth Sciences,
>University of Queensland, Australia
>Phone: 0402 841 677
>http://www.geocities-dot-com/gregjpeters