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Problems with Preexisting Hydro | 14 comments (14 topical, editorial)

Re: Problems with Preexisting Hydro (3.00 / 0) (#6)
by Flux on Mon Apr 14th, 2008 at 12:57:52 AM MST
(User Info)

Can't add a lot to what Dustin has covered.

I just want to confirm that you are using a rheostat not an internal regulator ( if that alternator is normally fitted with one). You need to strike a compromise between wasted field current and turbine speed.

Also we know that you have a 24v stator but we don't know if you have a 12v or 24v field. I suspect that with your line drop you would get enough field with the 24v rotor and have to waste less in a rheo and mismatched field winding.

The 24v stator running on 12v will not be very efficient. If you had means of measuring turbine speed I would be tempted to suggest that you try to get the speed up enough to try it at 24v ( not going to work if you have a 12v field without an electronic field regulator).

Flux

[ Parent ]

Re: Problems with Preexisting Hydro (3.00 / 0) (#8)
by dbcollen on Mon Apr 14th, 2008 at 10:27:40 AM MST
(User Info)

There is no way to increase the rpm without gaining more head, or getting a smaller diameter runner. He is running the hydro at 12 volts, so the 12v rotor is fine. Switching to the 24v stator is just like winding an axial for lower cut in. There will be more I^2r losses in the stator windings, but it should be far offset by the lowering of the field current at his low output. there is also the possibility of using an Mx-60 to find the max power point, but there is the problem of huge inductive surges with the wound field when the mx60 unloads the turbine. Those surges don't happen with a PM alt, the voltage just doubles as the rpm doubles. (pelton runners typically have their max power when the cups are at 50% of jet velocity)

Dustin
Mad River Wind and Hydro
[ Parent ]

Problems with Preexisting Hydro | 14 comments (14 topical, 0 editorial)

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