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RPM switch? | 17 comments (17 topical, editorial)

Re: RPM switch? (3.00 / 0) (#14)
by vawtman (vawtman(at)charter(dot)net) on Sun Sep 21st, 2008 at 12:19:48 PM MST
(User Info)

Hi Todd
Whats your final conclusion on turbine size to gear up the alt?You may find that the turbine will need to be way oversized(cost more)than if you spent the money on a proper alt.Maybe just build a hawt from plans,

My 54pl will be less than 500 bucks.
Wind power cost more but fun.

Mark

[ Parent ]

Re: RPM switch? (3.00 / 0) (#15)
by Todd a on Sun Sep 21st, 2008 at 06:18:34 PM MST
(User Info)

I need some specs to really try this out. I have found some pulleys and belts that might work for gearing and I have found some switches, but I am unsure of what RPMs they work for. They are also mechanical switches, but they are made for speed controllers in motors, so it might work fine. If I use a 10:1 pulley and belt set-up and this switch (assuming I can get one in my RPM range) and a 62amp GM alternator, then I am looking at a pretty nice generator for under $150 for these parts.

I did find some specs on an alternator on outputs at different RPMs and it looks like they are made for about 1500rpm at about 40% and hit about 80% of rated at 2500rpm. They do not hit max rated until about 3000 or more. So if I can get a VAWT (hybrid) that can do 150-300MPH. If the turbine is strong enough to turn this alternator at those speeds with a 10:1 gearing then I might see 14-15v and 25amps at 150RPM, which is hopefully around 12-15mph winds (that is my goal). This is about 350w. At 18-20mph I am hoping on around 250rpm and about 50amps. This would be 700w. At say 23-25mph I am hoping on 300rpm and about 60amps. That is a nice 900amps. I could likely get a good VAWT for about to go with this for say $350 and that is with me doing only final assembly basically. I have several family members looking at making these if they work.

[ Parent ]

RPM switch? | 17 comments (17 topical, 0 editorial)

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