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Forum Index : Windmills : Motor condirations for small turbine

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Turgorunner
Newbie

Joined: 06/01/2008
Location: Canada
Posts: 1

Posted: 02:02am 06 Jan 2008

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Could someone help me determine if I have made a good choice for a motor?
I purchased the following in hopes of ultimately getting 12+ volts of battery charging juice from a project turbine:
Permanent Magnet motor w/ brushes
HP 2-1/2 at 130 VDC int.
1-1/2 at 95 VDC cont.
95-130 VDC
18.5 Amps
0-6750 RPM
Rotation reversible

Am I correct in thinking that I can get 12volts out of this if spun at a slower than max rpm as listed?
THANKS FOR YOUR HELP!!!

PS: Now that I have no water on property but lots of wind, I am selling micro hydro stuff! 4" turgorunner/base, several different alt./motors, nozzles, bases ,etc.

KiwiJohn
Guru

Joined: 01/12/2005
Location: New Zealand
Posts: 691

Posted: 10:19pm 06 Jan 2008

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Now answers yet? I will offer what I can.

Yes, I expect you can get 12 volts out of this motor at quite low RPM but I could not hazard a guess at what the numbers might be.

I would suggest connecting it to a 12V battery via a blocking diode then turn the motor/generator and see what happens. It is a big motor so be careful that it does not nip any fingers etc!

If you turn it one way you wont feel anything much but if you turn it the other you should (according to my imagination!) feel a sudden increase in effort when you get up to a bit of speed. That would be the 12V charging cut in speed. Maybe this simple test will give you a feel for what you have.

A simpler test would be to connect a 12V light bulb, something like a car indicator might be suitable, and try turning the motor/generator by hand but that wont give us as much information as the battery and diode test. An even easier test is just short the leads and see if it is hard to turn, hard to turn is good!

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