Re: Phase adjustment on Teletype motor?

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

Original poster: FutureT-at-aol-dot-com 

In a message dated 2/23/04 1:16:16 PM Eastern Standard Time, 
tesla-at-pupman-dot-com writes:

John,

One of the rotary gaps at my website uses a 1/20HP Teletype motor
with cap below the frame.  I used about a 50uF cap if I remember
correctly, which is a little larger than it should be.  I get about a
10V resonant rise across the motor.  This is the rotary which has
a G10 rotor with two spinning copper electrodes.  You may need
to click through some of my webpages to find it.  You can observe
your rotor under fluorescent light to see if the phase is shifting.

   <http://hometown.aol-dot-com/futuret/page3.html>http://hometown.aol-dot-com/futuret/page3.html

Cheers,
John


>Hello,
>
>Has anyone used the old 1/20 hp Teletype motors, the ones with a start
>capacitor mounted on the bottom of the motor frame, with John F's phase
>controller?  I read in the archives that some of these motors didn't
>require a capacitor in the phase circuit, just a variac.  How true is
>this?  If anyone has built this circuit with this particular motor, please
>let me know what value, if any, you are running.  I did order some 370 volt
>run caps, both 65 and 25uF, so hopefully I can mix and match and get a
>working value.  I have been running just the NST across the rotary gap, and
>playing with the rotary variac trying to get the electrodes to fire, but no
>luck yet.  Seems to me that I should be able to adjust the phase of the
>SRSG to get the rotary to fire with just the NST, to let me know that my
>phase is changing.  Info appreciated.
>
>Thanks,
>John Richardson
>