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RE: Advice for an Old Coiler
Original poster: "Dave Kyle by way of Terry Fritz <twftesla-at-qwest-dot-net>" <dave-at-kyleusa-dot-com>
Thank you for suggesting this test. My previous tests failed as I did not
take into account how dim the sync pattern would be. The disk made all the
The motor is labeled a Reaction Synchronous Motor made by Oriental Motors
model 5SK25A-AULA 1800 RPM 1/30 HP at 115 volts using a 3uf start up cap
I placed a 3 inch Styrofoam disk with a black line half way across it on the
motor. After testing every fluorescent light in the house I finally found
one with low enough persistent phosphor to yield results. As expected the
pattern was a cross since at 1800 RPM the disk should sync at four points.
This motor appears to always sync in the same location as I repeatedly
stopped and started it and the pattern was always in the same spot relative
to the motor housing. A second attempt with a neon light source gave the
It is my belief that provided that 1/30 HP is strong enough to spin the disk
it will work for a SRSG.
C&H sales http://www.aaaim-dot-com/CandH/index.htm in Pasadena, CA has loads of
these new for about $39.
Austin, TX USA
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, July 19, 2001 12:50 PM
Subject: Re: Advice for an Old Coiler
Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
In a message dated 7/19/01 10:47:46 AM Eastern Daylight Time,
> My synchronous motor may need to be replaced as I am unsure if it is of
> type that syncs from the same position at startup. It is a brand new
> synchronous motor from Oriental Motor. Has anyone any experience with
You can test the motor by placing a cardboard disc onto the shaft as
a rotor, and draw a white or black line across the disc. Then run the
motor under fluorescent lighting. You will see the pattern "lock up"
at a certain variac voltage. Start and stop the motor a few times to
see if it locks at the same position every time.