Justa Lurker wrote:
>> Not necessarily ... the resulting waveform would be quite fine
>> ... imagine a 25 Hz motor on one side turning a shaft connected to a
>> 60 Hz alternator.
> That is how it works. I remember doing some computer work for a
> company that developed aircraft electronics. In the back room with
> the ups and such were a couple of motor-generators that produced 400hz
> power, which is used in large jets. This was routed to the test
> benches and such.
> They have been used as online ups for a long time, usually with a
> flywheel to store the energy. Very low maintenance devices, that have
> been around for ages.
Sure, for enough 400Hz power for aircraft electronics. I also remember dynamotors for land mobile transmitters. But it doesn't sound viable for a power generating dam, especially when you could have the equipment by just replacing the original turbine driven generator.