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Re: Synchronous motor
In a message dated 00-02-21 05:16:45 EST, you write:
<< 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
> synchronous motor would be?
Phil,
All the teletype motors I've seen are the correct type for sync rotary
use.
> 2) Does this motor require a start capacitor and if so how can I
> calculate the value?
At least some of the teletype motors do require a cap. Some require
a rather large cap. I don't know how to calc it. You could just try
various caps and see what works. You may need as much as 80uF
I think (or larger).
3) The motor has three wires in addition the case ground and I'm not
about the hookup.
Some Teletypes need a relay that disconnects the cap after the motor
comes up to speed. The cap is just for starting. These starting only
caps tend to be the larger ones. You could use manual switches instead
of the "relay" switch to start it....but it's not as convenient. Perhaps some
teletypes have a start switch inside the motor....I don't know.
Generally the red wire gets hooked to the cap. I forget the other colors
offhand. Maybe someone else will report the colors.
Nice motor find,
Cheers,
John Freau
> Any help would be appreciated, especially pointers to internet resources
> for finding info of this sort in the future.
> Thanks,
> Phil Heslin
>>