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Forum Index : Windmills : advice on wind turbine project

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Brad

Newbie

Joined: 22/02/2012
Location: United States
Posts: 2
Posted: 04:35am 23 Feb 2012
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I am wanting to start on my first wind turbine, i have found tons of opinions on which motors to use, the 30v and 40v Ametek seems to be choice, but pricey. Ive also read tht the higher the volts the better so if higher volts are better then how do the Ametek motors do so well? I have seen that treadmill motors are great too.I have a few 24v 1500 rpm motor that i came across, hooked a drill to them an they lit a 12v light bulb but dont know at what rpm. will they work at all? Anyone that can point me in the right direction i would appreciate it! Working on a tight budget as this is my first one. thanks!Edited by Brad 2012-02-24
 
bvan1941
Newbie

Joined: 06/05/2010
Location: United States
Posts: 24
Posted: 05:39am 23 Feb 2012
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Brad,
Welcome aboard, were glad to have you!!
If you will spend some time reading some posts here you will learn enough to ask for good advice for all the things required for your project. "Eddie" has just asked for the same advice and we went through some ways he can move forward without being disappointed and frustrated with his efforts.
We all will help you just take some time to read what other new people have already asked. Your at the beginning of a great and an addictive hobby that will give you great satisfaction !!!

Not all Ametec motors do well. There are great other motors that will run circles around Ametecs (good Ametecs are scarce and expensive, now). Answering your next question is kind of easy (if I do this correctly)
lighting a small 12 volt light bulb only takes a very small amount of power. To light a 12 volt headlight say on your car takes hundeds more amounts of power.
example take that same motor and drill and try to light up an old 12v headlight !!

"Electrical power" is measured in watts: 12volts (x) 1 amp of current = 12 watts of
power(like in your small 12v lightbulb experiment)

In the example of the 12v headlight would be something like this: 12v(x) 10 amps of current from your car battery = 120 watts of power !!
I hope this gives you an idea of what you are trying to accomplish here.

Best advice, take some time and read articles from this forum before you try doing too much---at first !!
Do come back and stay, we will help you succeed.
Bill

Bill
 
Brad

Newbie

Joined: 22/02/2012
Location: United States
Posts: 2
Posted: 03:31am 24 Feb 2012
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Bill thanks for the advice! Over the past few weeks ive read alot from different sites, and i am still wondering if this 24v 1500 rpm motor will work for a first project, and if so what size blades? Im guessing from what ive read about 24 in. or so? If this motor is a waste of time then what kind of things should i be looking to pull one from? A good friend runs a salvage/recycling business so theres alot for me to pick from...if i know what to look for. thanks again!!
 
daveames
Newbie

Joined: 19/09/2009
Location: United States
Posts: 30
Posted: 08:12am 04 Mar 2012
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Hi Brad,

Welcome to a fun hobby!

Any progress with figuring out a good starting point? ..With your reading you may have realised that the 24v 1500rpm dc motor may not be the best choice for a direct drive first attempt at putting something together. (12 volt system?)

You are in better shape than most here in that you have access to some salvage motors!

I'd head over to your friends place with a volt meter and a pair of vice grips and spin a few of the scrap PMDC motors up...it's easy to count off 60 and 120 rpms by hand..might look for one that gives us 6-7 VDC at 120 rpm as a starting point.

If the motors have spec tags on them look for a ~90VDC at 1750RPM (seems like a common one) maybe 1/2 to 1 HP rating for a decent 4-5' dia mill.

Another good tip I've seen is to connect your proposed DC motor up to a battery or better yet a running automobile battery and see how fast the shaft spins...that's the speed we need to reach to start charging when used as a generator.

Fun stuff!
cheers, dave
KB1MZF
 
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