RE: Sync motor

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

Original poster: "David Kyle by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dave-at-kyleusa-dot-com>

I picked up my Oriental Motor http://www.omusa-dot-com/index.html 25Watt,
1/30HP 1800RPM synchronous motor surplus from C&H Sales in Los Angeles
http://www.aaaim-dot-com/CandH/index.htm. I paid about $35 dollars and they
had quite a few in stock last summer. No modifications were required and
it seems to have more than adequate power to keep an 8" x 1/4" G3 Glass
Cloth/Phenolic disk with 3/16 inch Lanthanated Tungsten electrodes
spinning smoothly at 1800 RPM. It works with John Freau's very cool SRSG
phase control circuit although it does seem to vibrate a bit at the
extreme edge of the phase adjustment
http://members.aol-dot-com/_ht_a/futuret/images/phshift4.jpg. 

You can see my SRSG here: http://home.austin.rr-dot-com/dkyle/tesla.htm

=========================================
Dave Kyle
Austin, TX USA
Email: dave-at-kyleusa-dot-com


-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com] 
Sent: Friday, February 15, 2002 1:19 PM
To: tesla-at-pupman-dot-com
Subject: Re: Sync motor

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Parpp807-at-aol-dot-com>

In a message dated 2/14/02 10:22:00 PM Central Standard Time, 
tesla-at-pupman-dot-com writes:

> Original poster: "Andy Cobaugh by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <
> kb3ewy-at-rcn-dot-com>
>  
>  Where can I find a synchronous motor for a SRSG and how much should I

expect 
> to
>  pay for one?  I don't want to make another static spark gap.
>   
>  Andy, KB3EWY

Andy,
I am making a SRSG right now. I cannot say my search for a salient pole-
synchronous motor was exhaustive but I checked with Grainger,
McMaster-Carr,
and a local motor repair shop. The guy in the motor shop had lots of
catalogs 
but
we never found anything. I faxed to McMaster. They are always very
helpful
and called back to say that they just have no source for what I am
looking 
for.

I have several motors. I picked a junk motor (1725 RPM) for practice and

filed 4 flats
on the armature. The results are not perfect but it works and
synchronizes 
under the
florescent lamps. So right now I am filing the flats on a near-new 1/4
HP, 
1725 RPM
Sears, Roebuck motor. It's not that difficult. Get a good flat mill
file. You 
could buy a rt-angle grinder for what I 
think a suitable motor will cost. My guess is that buying the motor does
not 
present
the most favorable cost-benefit picture.

Hope this helps.
Cheers,

Ralph Zekelman






















































































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