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RE: Synchronous motor
Hi Phil:
I also am using a TTY 3600RPM sync motor in my sync RSG (still under
construction). You can see pictures at:
http://people.ne.mediaone-dot-net/lau/tesla/sync_gap.htm and see if it's the
same motor as yours.
Beyond the HP rating, this motor is the right kind for sync RSG
applications. I mention the HP rating as I continue to have problems
spinning up the heavy 3/8" disk and pipe electrodes pictured on my web site,
I'm now seeing better results with a .09" G10 disk and acorn nuts.
The motor does require a starting capacitor, mine came with a unit labeled
88-108 uF, 120VAC. It also requires a starting relay that connects the
starting cap to the starting winding via the 120VAC wire during startup. I
know this is somewhat vague and I'm not going to attempt an ASCII art
representation, let me know if you're still interested and I'll email you a
GIF schematic.
The color code of the four wires exiting the motor are:
Green - Chassis ground
Red - Start winding (connect to 120VAC through starting cap at startup)
Blue - Run winding (120VAC)
Yellow - Common (neutral)
Regards, Gary Lau
Waltham, MA USA
>Original Poster: "Phillip Heslin" <pheslin-at-home-dot-com>
>
>Coilers,
>
> I have found an old Teletype motor I would like to use in a
>synchronous RSG and I have a couple of questions. The specs are:
>1/12 hp, 3600 rpm, 60Hz, 115V single phase, time rating - continous.
>
>My questions are:
>1) Is this motor synchronous in the same sense that a salient pole
>sychronous motor would be?
>2) Does this motor require a start capacitor and if so how can I
>calculate the value?
>3) The motor has three wires in addition the case ground and I'm not
>about the hookup.
>
>Any help would be appreciated, especially pointers to internet resources
>for finding info of this sort in the future.
>
>
> Thanks,
>
> Phil Heslin