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Forum Index : Windmills : ebay

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DaViD

Senior Member

Joined: 14/01/2009
Location: United States
Posts: 120

Posted: 03:31pm 22 Jan 2009

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I have been looking around on Ebay and have seen a lot of servo motors. Is there any one motor that is really suited for wind power or is it just a matter of what i want to build?

If your not living on the edge your taking up to much space!

Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5119

Posted: 12:31pm 23 Jan 2009

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Hi David

Its depends on the operating voltage and how many $ they want for it.

The higher the voltage the better, a servo that runs at 100 volts or more would be fine. The bigger ( higher watt or amp rating ) the better to, again depending on price.

Servos come as either DC or AC. Either will work, but AC is better if you can get it. DC means brushes, and these will wear out. AC types are usually 3 phase, good.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
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luckeydog

Newbie

Joined: 04/02/2007
Location: United States
Posts: 1

Posted: 06:52am 26 Jan 2009

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Hey David

I am new here but not new to wind power. so this will be my first post on this Website.

Glen is correct higher voltage is better, But also important is the rated RPM

so high voltage low rpm and high amp rating is good.

For example

A 110 volt motor rated at 3500 rpm
is better than
a 110 volt motor rated at say 4600 rpm

3500/110 =31.81 this means 31 rpm per volt so achieve say 12.5 volts you would need to spin your motor at 397 rpm

so this example motor would not be a good motor to use as a direct drive.

A good motor for a small turbine say 120 watts
would be something like this

50 vdc at 900 rpm
12 amp

900/50=18 one volt per. 18rpm
18* 12.5=225 rpm a reasonable rpm for a 6 foot turbine

I hope this makes scene.

I hope i did all my math correct.

Luckeydog

wind gens are so much funner to watch than solar panels

http://www.coloradowindpower.com

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