RK05 spindle pulleys - trade 50Hz vs 60Hz?

[Tony Duell]

On Thu, Jul 26, 2018 at 4:14 PM, Chuck Guzis via cctalk
<cctalk at classiccmp.org> wrote:

> Such MG setups were very common in industry before modern
> semiconductors.  When I had a summer job showing movies at a drive-in
> theater (a long time ago), the supply for the carbon-arc lamps was a
> 40hp motor powered by 3-phase 60Hz, driving a DC generator.  In WWII
> radio equipment, MGs in a unitzed form called "dynamotors" were used to
> supply the high-voltage anode voltage for the tubes.  Electroplating
> shops similarly used large DC generator setups to supply plating current.

I believe if you want to be pedantic that a motor-generator set is a motor
(with an armature/rotor and a field/stator) mechanically coupled to a
generator (with its own armature/rotor and field/stator) whereas a
dynamotor has a common field/stator (and possibly both armature
windings have to be wound on the same core).

-tony