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Wrong Motor | 56 comments (56 topical, editorial)

Re: Wrong Motor (3.00 / 0) (#6)
by CmeBREW (smke833f@hotmail.com) on Mon Aug 25th, 2008 at 07:50:40 AM MST
(User Info)

What is the rpm of the motor? If it is 6700rpm , then it is no good as a mill generator. It would take over 600rpm to reach the 12 volt cut-in with a 4' diameter prop. What is the diameter of your prop and type of blades?

Re: Wrong Motor (3.00 / 0) (#9)
by adaml on Mon Aug 25th, 2008 at 12:31:54 PM MST
(User Info)

I very obviously have a great deal to learn, lol, thank you all for your input. The motor is rated at 95-130 VDC, 0-6750 rpm which I got the net, hence wondering if it is not the best one for the job. The wind here is not clean but I intend to set it up to test properly in a large open field next door away from all buildings, trees etc. However, I had hoped to see more than max 3v when only connected to my multimeter.

[ Parent ]

Re: Wrong Motor (3.00 / 0) (#12)
by kurt on Mon Aug 25th, 2008 at 01:36:51 PM MST
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you would have to spin that motor approximately 625 rpm or so to get 12v out of it that is way to fast for a windmill always look for a low rpm motor when looking at motors the crazy fast ones don't put out anything at a speed you can spin them with a prop. to get a general idea how fast you are going to have to spin a motor to get the cut in voltage you want divide the max rpm on the nameplate by the max voltage on the nameplate then multiply that number by your cut in voltage. usually 12 for small systems. that will give you a ballpark idea if the motor will work or not. 4' props like to cut in about 300-350 rpm the larger the prop the slower the cut in needs to be

http://www.reresource.org/

IRC
[ Parent ]

Re: Wrong Motor (3.00 / 0) (#13)
by adaml on Mon Aug 25th, 2008 at 02:15:12 PM MST
(User Info)

Thanks Kurt,

Hmmmm, should have done a bit more in-depth research before rushing to purchase a motor, just trusted the description given on the web site! My blades are 36" length each, three of and I do not think that they will ever realistically spin to 625rpm. This size seemed larger than others had made having done a trawl of others websites.
Is there a golden rule or some basic figures to look for when chosing a motor? Think I might have to go back to the drawing board regarding the motor and call that lesson learnt. I have heard of Ametek motors but again they seem to come in all shapes and sizes so am a bit ignorant of which sort is best suited.

[ Parent ]

Re: Wrong Motor (3.00 / 0) (#15)
by Norm (peppysue@suite224.net) on Mon Aug 25th, 2008 at 06:44:00 PM MST
(User Info)

An Ametek motor is perhaps your best bet for
beginning...Here is a very good link....
http://www.tlgwindpower.com/ametek.htm
and get a load of that TLG 500 watt generator !
Nice huh?
BTW...looks like you're handy enough to make
your own Alternator ...have you ever considered
making your own from an old 20" window box fan?
makes about 50 watts uses much smaller blades
half the size of your blades....most difficult
is grinding 4 flats on the armature and gluing
4 neo magnets onto it.
Ghurd posted in his diary awhile back....

( :>) Norm
[ Parent ]

Wrong Motor | 56 comments (56 topical, 0 editorial)

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