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Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
As some of you may know I am working on a wind generator. I currently have a 23g wire stator and a 20g wire stator.
Here are some current pictures for my testing harness <a href="http://www.mindchallenger.com/wind"> here </a> <BR><BR>
I have a question. If I can spin the rotor as fast as I want before the stator wire melts from overheating, is there a limitation to how much power a fixed wire-diameter stator can generate? Or, will it continue to yield more power with a faster changing magnetic field? I am guessing that the RI^2 loss is a factor, but I do not know how much.
Registered Member #190
Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567
Yes. I did mean a matched load for a Star three-phase generator.
Also, if I measure the resistance of one phase (output to the neutral of the Star configuration) will doubling this equal the stator resistance. If I know this, how do I determine the proper load for matching?
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
I am not an expert in wind power so treat my information with caution!
The primary limitation will be the power that you can take from the wind, there is an optimum loading for maximum power for a given swept-area and wind speed, optimizing this will be your primary concern I believe.
Electrically, the open-circuit voltage will be proportional to rotational speed. I do not think that the maximum power transfer criterion of electrical source impedance = load impedance will be used, this would result in half of the wind power being dissipated in the generator!
The EFFECTIVE source impedance of the generator will be determined mainly by the wind/rotor blades/generator combination, with the alternator electrical resistance being almost negligible! The only consideration for the winding resistance will be I^2.R heating of the windings. For reliability use about 2.5 amps per square millimeter of wire (up to 10 A/mm2 if the alternator is WELL ventilated)
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Do generators have a limit
