Re: Synchronous rotary gaps.
From: Robert W. Stephens[SMTP:rwstephens-at-headwaters-dot-com]
Reply To: rwstephens-at-headwaters-dot-com
Sent: Saturday, September 13, 1997 8:31 PM
To: Tesla List
Subject: Re: Synchronous rotary gaps.
> From: Edward V. Phillips[SMTP:ed-at-alumni.caltech.edu]
> Sent: Friday, September 12, 1997 3:11 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Synchronous rotary gaps.
> Most teletype machines used synchronous motors powerful
> enough to run a fairly large gap, certainly in the 7 to 10 inch
> diameter range. Since these are now totally obselete, it should
> be possible to find large quantities of these motors dirt cheap.
I have a teletype motor rated at 3600 RPM, 120 vac with a 3/8th's inch shaft
size. It has a shielded cover on the opposite end of the motor to
the output shaft which contains a centrifugal switch. The switch
setting is adjustable + and - by a screwdriver adjustment. There are
a series of holes designed to be illuminated with a strobe light for
speed adjustment. I believe
this type of motor to be fairly speed synchronous but in no way phase
synchronous which is of paramount importance in the TC application.
I was also disappointed to discover that the motor lacked sufficient
torque to maintain 3600 RPM on a rotary break wheel even smaller than you
Perhaps the teletype motors you refer to are a different animal than