RK05 spindle pulleys - trade 50Hz vs 60Hz?

[Jon Elson]

On 07/26/2018 10:26 AM, Tony Duell via cctalk wrote:
> 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).
>
Yes, a dynamotor has ONE armature with a commutator on each 
end. There is one set of field poles for the whole unit, 
too.  The low-voltage input and high-voltage output windings 
are laid in the same slots in the armature.

Jon