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 Power of Nature
 Wind Power
 new motor just came my way
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olddawgsrule
Advanced Member


USA
1434 Posts

Posted - September 01 2013 :  13:17:29  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
A friend dropped off an old treadmill this am for me to scrap for whatever I can get out of it.

The motor is a DC permanent magnet motor
But...

I want to know if I'm analyzing this correctly..



130vdc at 7099rpm
Tells me 55rpm to produce a volt
Which tells me 820rpm to get into 15v's

I suspect I can do the same with the amperage (?)
17.2a at 7099rpm
Which tells me 413rpm per amp

Which tells me this would turn into a <30watt generator at 800+rpm..
(15v x 1.9a = 28.5watts)

I use 250rpm as a base for evaluating a possible unit to build a wind turbine with.

Curious how you guys about this.
And if I can legitimately break the amperage down the same way?

Personally, don't see this one as a good candidate..
Probably going up to Maine, to my cousin, who has 3 of these powered from his stream.. He may now have a fourth.




Old in age, not in mind, so
'Teach me something new'!

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49er
Administrator



USA
4426 Posts

Posted - September 02 2013 :  11:50:03  Show Profile Send 49er a Private Message  Reply with Quote
Hi ODR

When I first got my small wind gens they were 200 watts and I did see at times more than 8 to 10 amps which is around 120 watts so I don't think your numbers are right. Meaning if you use it as a wind gen you will do better than that.

Doug
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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - September 02 2013 :  14:42:19  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
Here's a screen shot of the spreadsheet


I'm pretty secure on the voltage side of this.

It's the amperage breakdown I'm not soo..

The spreadsheet is the beginning of a program I hope to use with friends (like you guys) later.

Next would be to add in average wind speed to calculate possible catch of wind.
Then would be resistance of the generator.

That should tell us how many blades to compensate and produce what we hope.

All I'm after here, is to get a program running that tells me with basic information if the motor I have is worth what I need to do to make it happen.
Or just go find another motor...

First step still remains...
Can I evaluate amperage as I have voltage vs RPM??
I'm believing I can...



Old in age, not in mind, so
'Teach me something new'!

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ron_o
Moderator



United Kingdom
1052 Posts

Posted - September 03 2013 :  15:56:38  Show Profile Send ron_o a Private Message  Reply with Quote
Hi ODR

That's a nice motor you have there

The values given on the motor plate are really only applicable to when it is being run as a motor.

Best thing to do is actually drive this motor at a given rpm and measure the actual output voltage

ron
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olddawgsrule
Advanced Member



USA
1434 Posts

Posted - September 03 2013 :  19:03:16  Show Profile  Visit olddawgsrule's Homepage Send olddawgsrule a Private Message  Reply with Quote
quote:
Originally posted by ron_o

Hi ODR

That's a nice motor you have there

The values given on the motor plate are really only applicable to when it is being run as a motor.

Best thing to do is actually drive this motor at a given rpm and measure the actual output voltage

ron



And that's exactly what I did.
Reason I feel pretty good on the rpm/voltage side of this.
I will test again at different speeds to confirm.

Next I'm going to test amperage accordingly.
At certian rpm, what amperage does it produce..

Looking now at what I'll use to test amperage..


Old in age, not in mind, so
'Teach me something new'!

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