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low RPM rumble | 14 comments (14 topical, editorial)

Re: low RPM rumble (3.00 / 0) (#2)
by TheCasualTraveler (a.miklos@yahoo.com) on Tue Apr 22nd, 2008 at 05:57:43 PM MST
(User Info) http://thecasualtraveler.com/wind.htm

The machine is 3 phase. 12 pole, 9 coil, second disc with no mags. Sounds like my suspicions are right. Will more phases make for less vibration possibility?
Andy

Re: low RPM rumble (3.00 / 0) (#3)
by wooferhound (tim((NoSpamAt))wooferhound.com) on Tue Apr 22nd, 2008 at 06:15:33 PM MST
(User Info) http://wooferhound.com

Yes
but I don't think you can ever get away from the vibration / sound completely.
That is why it's not recommended that wind generators be mounted to buildings and especially don't mount them to the place you sleep or there will be no more sleep.

W o o f -={(

[ Parent ]

Re: low RPM rumble (3.00 / 0) (#5)
by ghurd on Tue Apr 22nd, 2008 at 06:29:14 PM MST
(User Info)

The 3 phase to DC output still has ripples, but a lot less ripple than single phase because single phase goes to 0V.

My bet is the ripple between 0.75A and 2A is when the peaks of the ripples are above battery voltage, but the voltage valleys are not above battery voltage.

More phases would help, but I don't know if it would completely go away, without too much money and probably a loss of efficiency.
G-

[ Parent ]

Re: low RPM rumble (3.00 / 0) (#6)
by DamonHD (d@hd.org) on Wed Apr 23rd, 2008 at 01:14:38 AM MST
(User Info) http://www.earth.org.uk/

I wonder if you could decouple the genny from the battery in some way, such as with a big power capacitor or a small in-line inductor or even something a little more elaborate such as an MPPT tracker.

That might take the sting out of the 'edges' as you move into (and out of) conduction and thus dampen the vibration.

Just thinking out loud and almost certainly rubbish...

Rgds

Damon

[ Parent ]

Re: low RPM rumble (3.00 / 0) (#8)
by Capt Slog (Capt.Slog(at this)gmail.com) on Wed Apr 23rd, 2008 at 03:22:46 AM MST
(User Info)

Yup Ghurd, I hear those ripples. I have a homemade ammeter in my set-up, it's mounted on the wall in the shed above my batteries. The coil in this is a few turns of thick copper wire, and the whole thing buzzes when the needle moves and I'm making power, and the plate the thing is built on acts as a sounding board for it.

Personally, I love the sound, but I can guess that it must be worrying to hear it come it from the turbine.

.
"Slowly changing the world, one watt at a time!"
[ Parent ]

low RPM rumble | 14 comments (14 topical, 0 editorial)

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