4 May
2021
4 May
'21
5:01 p.m.
On May 4, 2021, at 7:53 PM, Carlos E Murillo-Sanchez
via cctalk <cctalk at classiccmp.org> wrote:
Donald via cctalk wrote:
Polyphase would be complex, adding more generator windings, wires, and power transformer
windings. The usual approach instead is to increase the frequency, which is easy to do.
400 Hz is a standard frequency for applications where transformer weight is a concern, so
it's found in airplanes among other things.
paul
In the deep recesses of my mind I seem to
remember something about S/360
machines using a motor generator.
If I am right was this to create a stable power source at a certain
frequency or voltage?
Those systems predate my experience by roughly 25-30 years.
But once you go through the trouble of adding such a thing as a motor-generator, then you
can make the generator a poly-phase device (say, 12-phase) and get a much lower ripple in
a full-wave polyphase rectifier; you can also easily control the output voltage by acting
on the generator's rotor field current. This sort of equipment is used for industrial
processes requiring DC at thousands of amps; the polyphase setup makes it possible to
leave out the output filter capacitors.