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Rewind | 12 comments (12 topical, editorial)

Re: Rewind (3.00 / 0) (#4)
by Ungrounded Lightning Rod on Mon Aug 4th, 2008 at 03:01:41 PM MST
(User Info)

Yes there is a simple way to work it out, presuming you want the same WATTAGE from the genny at any given RPM. Your boost in voltage is accompanied by a drop in current.

You rewind every coil with 350/240 times as many turns, using wire with a cross section of about 240/350 times the cross section of the original.

Unfortunately, changing by one wire gauge produces a cross-section ratio of about 1.26. So going one gauge thinner leaves you too thick and you might have trouble cramming all the turns in, while going two gauges leaves you too thin and you have excess resistance. Your ratio is right "in the crack between the piano keys". If you can manage it, go with the larger option.

Re: Rewind (3.00 / 0) (#7)
by Seedler on Mon Aug 4th, 2008 at 04:28:27 PM MST
(User Info)

So does this mean the coils should have 1.46 times the turns as the originals to get the higher voltage. For example if the original coils have 100 turns the new coils should have 146 turns. Is this rite?

Does increasing the voltage effect the short circuit braking properties of the turbine or will that all stay the same?

I dont know much about the whole resistance issue. Does using smaller wire mean the turbine will have less output through heat loss? Will overheating be an issue?

I was talking to a local motor rewind shop that said they could rewind it, but I wasn't convinced they knew what I was talking about. I would rather be able to tell them what needed to be done, like how many turns to use and what wire size, than rely on them doing what they thought was best.

Thanks for everyones input.

Dee.

[ Parent ]

Re: Rewind (3.00 / 0) (#8)
by vawtman (vawtman(at)charter(dot)net) on Mon Aug 4th, 2008 at 04:48:30 PM MST
(User Info)

Hi dee
Awhile back you posted a link for me where you bought it but, all i saw was a pretty girl and travel destinations.

Can you post a pic of the innards?

How many poles is it?

How many turns of what size wire?

Sorry if i missed something.

Mark

[ Parent ]

Re: Rewind (3.00 / 0) (#9)
by Seedler on Tue Aug 5th, 2008 at 06:37:07 AM MST
(User Info)

Vawtman, Sorry about the link not working. Try these two. Both company names were on my turbines boxes, and the guy I delt with seemed to have email addresses with both companys. I'm guessing they are partner companys.

http://www.windgenerators.cn/index.asp

http://www.windgenerator.cn/

Web addresses are almost identical except for the s.

I'm sorry but I dont have any pics.

I havent got it down yet but from what I can remember the rotor had 2 pair of about 8 x 2" by 4" magnets going around its diamater.

I couldn't tell you wire size. And I have no idea how to tell the windings of each coil.

Would it work ok if I just went one size smaller of wire for the coils, and then just fitted as many turns in as I could? I'm aiming for 350v but would be happy with anywhere between 330 and 350

Dee.

[ Parent ]

Rewind | 12 comments (12 topical, 0 editorial)

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