26 Jul
2018
26 Jul
'18
9:05 a.m.
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:
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
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).