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speo
Junior Member
Canada
113 Posts |
Posted - 08/02/2008 : 14:56:24
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Sure, no problem, it's already public, anybody can use it, right?
If he wants to publish the data, I think it would be nice to mention www.gotwind.org as the source of info.
Speo
www.windpulse.com |
Edited by - speo on 08/02/2008 14:57:13 |
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litespeed
Starting Member
USA
42 Posts |
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gotwind
Forum Admin
United Kingdom
936 Posts |
Posted - 08/02/2008 : 22:09:46
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Seb.
You can attach photos here also, Please resize them to 640 pixels width - usually 480 height for a standard photo.
It just makes it a bit easier and saves some bandwidth for dial up users - Cheers.
The Futures Green - Getwind of it. |
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litespeed
Starting Member
USA
42 Posts |
 Posted - 11/02/2008 : 20:54:01
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quote:
Originally posted by speo
AJ,
You are welcome.
If you have access to a surplus store, check for an Indiana 24vdc (rated 24v@375), if you like its bench test numbers published in this thread: http://gotwind.forumco.com/topic~TOPIC_ID~337.asp
If you have a digital multimeter, can you check (and let us know) the winding resistence of your motors?
Thanks,
Speo
www.windpulse.com
Speo,
I was in a surplus store again today. I found 3 Ametek 40VDC, 1 Ametek 38VDC, 1 Ametek 20VDC and I was looking at this big Indiana General again. No Indiana General 24's. But they did have 2 of the 36's.
The larger Indiana General says it is rated at 60VDC at 1390 RPM's and 11.2 amps. The housing is 4" in diameter and about 9" long. It is a little harder to turn than the Ametek 50's but not by much. Do you think it is worth picking up? Or any of the other ones for that matter?
AJ
Sebastian, FL
Wind gen. in progress |
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speo
Junior Member
Canada
113 Posts |
Posted - 11/02/2008 : 21:47:40
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AJ,
You said you already have a 40 and a 38. Test them and if you are happy with them...get other similar ones.
Ametek 20 and 40 needs higher RPM. At least the ones I tested. I know there are two versions of 40, none of them as good as the 30s in terms of voltage/RPM.
I tested one Indiana 36/1125, which was close in terms of voltage to the high RPM Ametek, but better in Amps.
If you play with the "labeled" numbers for the Indiana 60, you'll see that in terms of voltage is close to the Ametek 30, sligthly better than the low RPM version. In terms of Amps, I think this Indiana 60 is much better than Ametek 30. Do you know what the winding resistence is for Indiana 60? I think this one is the most interesting one, if the numbers from the labels are close to the generator "mode" numbers and if the winding resistence is lower than Ametek 30's.
Speo
www.windpulse.com |
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litespeed
Starting Member
USA
42 Posts |
Posted - 12/02/2008 : 15:45:49
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Speo,
I tested both of the 50's last night. I was not really sure what I was doing. I put the meter on the lowest setting on the Ohm's side (200).
Initially I was getting 6.4 to 7.0 out of both of them. So I ran them on a 12 volt battery for a couple minutes (like you said). Tried it again and was getting between .7 and 1.2 on the meter. Does this sound right.
I'll be up near that store again tomorrow. I'll pick up the 60 and test it as well. I can probably get it for $10 or $20.
AJ
Sebastian, FL
Wind gen. in progress |
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speo
Junior Member
Canada
113 Posts |
Posted - 12/02/2008 : 18:24:27
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AJ,
I got 1 ohm for mine after running it for few minutes, to make sure the brushes and comutator cleans up a little bit. Your reading is fine.
$10, $20 is really cheap, you're really lucky.
Keep us posted.
Speo
www.windpulse.com |
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litespeed
Starting Member
USA
42 Posts |
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speo
Junior Member
Canada
113 Posts |
Posted - 19/02/2008 : 02:24:48
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AJ,
Good find - this motor.
Everything looks good, but I don't like the motor mounting. It doesn't look strong enough.
Did you find a way to measure the RPM when hooked to a battery? That willl be interesting to find out.
Keep us posted with any numbers.
Speo
www.windpulse.com |
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litespeed
Starting Member
USA
42 Posts |
Posted - 19/02/2008 : 20:29:51
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Ok... Here are some more #'s. I ran both the Ametek 50 and the Indiana 60 for a few minutes @ 14 volts. After the run I checked the resistance again. I am getting a solid 1.0 on the Ametek and .7 to .9 (.9 most of the time) on the Indiana. I managed to do some RPM counting (difficult to do). It looks like the Ametek is turning 320 to 340 RPM's @ 14 volts and the Indiana is turning 240 to 260 RPM's @ 14 volts.
Only problem is that the Indiana does not spin as easily as the Ametek. I'm betting that the prop will be difficult on that one.
I have ordered one of those laser tachometers to get a better reading. I could get some use out of it, so it is worth the investment. I'll post the accurate readings when I get the tach.
I wonder what it would cost to ship one of those controllers that ghurd and fungus have been messing with to the U.S.? Pretty neat little device.
AJ
What's that noise!? Uh Oh!...
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speo
Junior Member
Canada
113 Posts |
Posted - 20/02/2008 : 16:40:33
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AJ,
Don't worry about Indiana being more difficult to turn than Ametek. My Indiana was also hard to turn, but when attached a 4' rotor, it started to turn in very low winds.
Ghurd is in US, so, it will be cheap - $3 maybe?
speo
www.windpulse.com |
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litespeed
Starting Member
USA
42 Posts |
Posted - 01/03/2008 : 15:31:56
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quote:
Originally posted by speo
AJ,
Everything looks good, but I don't like the motor mounting. It doesn't look strong enough.
Speo,
What part of this thing do you think is not strong enough? I don't want to fly it, if it is dangerous. I damn sure don't want to hurt myself or someone else.
Here is the breakdown:
The square tubing is thick walled steel 5' long, the "half pipe" is 4" thick walled stainless steel 6" long, bolts and washers are all 3/8" grade 8, motor casing is 4" sch. 40 PVC, the clamps are 4.5" aircraft T-bolts and the tail is 3/8 marine grade plywood. I used to be a jet engine mechanic so I used clamps that are similar to securing Bleed lines from the turbine (minus the V grove). Those will be safety wired as well.
Thanks again for all your help!
AJ
What's that noise!? Uh Oh!...
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Another Crazy Newbie!
