A simple DC motor will act as a generator when driven, although a generator/alternator would probably be better. It depends on how much power you are wanting to generate.
Rotational speed depend on the number of pole of AC generator and desired power frequency output. In water turbine a speed governer is used to mentain desired rpm.
Hi,
it depends of your water volumen/minute & continuity!
Assumed you have long time flowing continuity: I dont believe that you can have an exact rpm (or AC frequency) if you dont have an electrical inverter.
If its to connect to your "grid" you must have the system frequency & an aproved equipment...
K.
Hi Kabiru,
Tnx_yes, these is my "per definition" knowledge too.
@Brian,
For a variable propeller geometry I can not see some real chance_maybe for professional/bigger systems?
In my opinion is the only way by variant damping & /or water volume to use a "Archimedes snail"...
K.
I don't agree. Bicycle dynamos are always (PM excited) AC generators, other dynamos, possibly depends on. Do you know a reason,
why a bicycle dynamo should generate DC?
A DC generator is used for wind mill and generate power to charge a battery using charge controler, then what will stop the dc generator from doing the same job. see this link. www.mdpub.com/Wind_Turbine/
index.html