[Milsurplus] powering selsyns

[J. Forster]

You can run a 400 Hz Synchro or Selsyn (or motors or transformer) from 60
Hz, but at reduced voltage  = 60/400  0r 15% of it's rated 400 Hz voltage
indefinitely. You just won't get much torque or output voltage.

If it uses a phasing capacitor, the value should be increased by a factor
of 400/60 or roughly 6.6 times.

Motors will run about 60/400 times as fast....  a concern if they are
driving fans.

Best,

-John

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> It seemed to be pretty common  with hams in the 50's to stick an ac
> capacitor is series with the selsyn motor windings and run it off
> 110VAC. Calculate the reactance required to limit the current to arrive
> at the value. It worked intermittently at 60 Hz. with no problem.
>
> Ralph
> VE3BBM
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