[GreenKeys] Need motor for 50Hz supply (or DC)

[scottjohnson1 at cox.net]

The problem is not the motor, but the generator.  Not exactly falling out of
trees!
I have a 10 HP 60 Hz Motor driving a 5kVA 50 Hz generator, 320 lbs.  Free to
anyone that would be willing to pick it up!


Scott V. Johnson, President 
Sunburst Engineering LLC
5111 E. Sharon Dr.
Scottsdale , AZ 85254
(480) 550-2358
Scottjohnson1 at cox.net

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net>
On Behalf Of Jones, Douglas W via GreenKeys
Sent: Thursday, September 3, 2026 3:12 PM
To: greenkeys at mailman.qth.net; John Lawson <john at tubetestingpros.com>;
Jones, Douglas W <douglas-w-jones at uiowa.edu>
Subject: Re: [GreenKeys] Need motor for 50Hz supply (or DC)

I'm surprised nobody has mentioned motor-generator sets in this thread.
That's odd, because MG sets were used all over the place in RTTY work back
in the vacuum-tube era to get plate voltage from automotive sources.  As a
kid, I had a WWII surplus MG set that I used to play with.

For the case in point, a motor rated to run on Ausralian line current
driving a generator designed to produce US line current would solve the
problem.

A cheaper solution would be to get an inverter designed to produce 120V 60
Hz from, say, 12V, and then power this with a 12V supply derived from the
local 50Hz mains.  Far simpler than a VFD, and inverters with enough power
to run a TTY are pretty common.  Just make sure it's one that advertises
"true sinusoidal output", because cheap inverters that output a square wave
are lousy for running induction motors.

           Doug Jones
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