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Test results for my first conversion
By Tropical son, Section Homebrewed Electricity Posted on Thu Feb 23, 2006 at 02:31:48 AM MST
Is the rated amps for a motor important ?

Hi guys , a few months ago (10/10/2005) i posted a story about my first induction motor conversion.I recently did some open voltstests and here are the tests results. I do not have any electrical knowledge and i am new to the wind power field ,so please bear with me if any of my comments or questions seem stupid.I have been reading the forums for a while now and i know that some of you guys are a vast wealth of information and knowledge. i just hope that i can absorb some of it( i am a BIT slow ). I live in a condo in the city so puting a wind turbine in the air is out of the question for me right now .So i have listed this conversion for sale on ebay.l From looking at the test results , suppose i were to connect this motor to a 12v or 48v battery bank - what sort of voltage and AMPS would I see when it's connected and at what speed? And what size of blades would be recommended ? or do i have to test it under load before any conclusions can be made ?
I am planning on doing another conversion using a six pole 3 phase motor .Would the rated amps of the motor make a difference ? Would a higher or lower rated numbers of amps have any bearing on the output after conversion ?
Any comment , explanations or criticisms would be appreciated !! Thanks in advance .
Kenny.

Test results for my first conversion | 3 comments (3 topical)

Re: Test results for my first conversion (3.00 / 0) (#1)
by Ungrounded Lightning Rod on Wed Feb 22, 2006 at 08:41:26 PM MST

Yes, you have to test it under load - or measure its resistance (which is difficult at that low a value) - to understand how it will behave.

You'll notice that voltage and speed are directly proportional. (Do the ratios of the samples you took and you'll find them agreeing within 1%, which is essentially roundoff error.) From that you can compute cutin speed. But with no clue about internal resistance you can't figure out how much current you'll deliver into your load, how much shaft speed will rise above the cutoff speed clamping with increased wind speed and generation, and thus how much prop you'll need and what its design criteria will be.

With respect to the motor's rated current (before conversion), that's also the max current you'll want to pull from it as a genny (except for bursts on the order of a couple seconds or less in the moments before furling). The main limit on your capacity comes from the motor's ability to dissipate heat, and the heat comes almost entirely from the I-squared-R losses from the current in the motor windings. Since heating climbs with the square of the current, the better cooling the motor experiences in a windmill application doen't buy you much extra current before burnup.

Re: Test results for my first conversion (3.00 / 0) (#2)
by asheets on Thu Feb 23, 2006 at 10:35:08 AM MST

what is the ebay auction number?

Oh, and do you have a link to the post that describes the original conversion? Did you rewind it and stuff?
_____________________________

Alan Sheets

Re: Test results for my first conversion (3.00 / 0) (#3)
by richhagen on Thu Feb 23, 2006 at 05:28:39 PM MST

Here is his auction:
http://cgi.ebay.com/HOME-BREWED-WIND-TURBINE-GENERATOR_W0QQitemZ6037347049QQcategoryZ121837QQrdZ1QQc mdZViewItem

I saw it a few days back and recognized the seller Tropical_Son from his previous posts here. Rich Hagen
'A Joule saved is a Joule made'

Test results for my first conversion | 3 comments (3 topical)

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