the Otherpower.com Discussion Board || Comments Low amperage output

Front Page - [Homebrewed Electricity-- (wind) (solar) (hydro) (steam) (controls) (storage) (mechanical)] - Classifieds - Site News
Everything - Newbies - [Remote Living-- (housing) (heat) (light) (water)] - Rants & Opinion - Diaries - Our Products

Low amperage output | 11 comments (11 topical, editorial)

Re: Low amperage output (3.00 / 0) (#9)
by Flux on Sun May 18th, 2008 at 12:51:33 PM MST
(User Info)

Yes this does help. Some single phase motors have identical start and run windings and are usually used for reversing capacitor run work.

As you had identical resistance on the start and run windings I assumed that most likely this was what you had. It seems just chance that your resistances are equal in this case and you have a start winding with few turns and wound with very thin wire, possibly capacitor start but just as likely resistance split phase start.

In reality the start winding is virtually useless to you and will contribute very little, the thing is never going to even approximate to a 2 phase machine. Single phase things don't do very well anyway but even so I think you are stalling with the main winding. By adding the start winding in series you are doing little more than adding 5 ohms as a form of line resistance and it is bringing you a bit more out of stall.

Without rewinding to a true 2 phase or 3 phase you will not get any great improvement but I still think it will go better at 36v.

Flux

[ Parent ]

Re: Low amperage output (3.00 / 0) (#10)
by modernmarvelinspired on Sun May 18th, 2008 at 04:58:55 PM MST
(User Info)

Hey Flux, I never did truly seperate the 4 coils that make up the main winding. Today I went ahead and took it down, dug inside of it and seperatated all the leads that the 4 coils have. The best configuration I've come up with so far is two coils paralled, two coils in series. Then took the two coils in series and put them in series with the two that are paralled.

This brings the cut in speed down to about 190 rpms. At 370 rpm now I get 60vac, instead of 42vac. I'm sure this will limit my amperage a little, but it truly seems like I made this better.

By the way the coils were poorly sodered, so I re-sodered them, which i'm sure will help more amps to come through. I think I read somewhere that some cheaper induction motors the splices from the leads to the coils is sometimes not that great.

I'm going to make a set of 8 foot blades, according to hugh's plans and see how it does. I'll definately try to let you guys know. I think his plans for 8 foot rotor is around 7 or 8, which they should do just fine

I dont think i'm gonna use the start winding at all, it doesn't really seem to do well by itself. Like you said.

Thankyou for your time
MMinspired

[ Parent ]

Re: Low amperage output (3.00 / 0) (#11)
by Flux on Mon May 19th, 2008 at 01:01:56 AM MST
(User Info)

A few things don't tie up. You should cut in at 24v with single phase when the peak ac equals the dc. Conduction will be small at the start and increase with speed. You should start to see output at 20v ac. If you get 60v ac at 370 rpm this implies a cut in of 370/3 which is nearer 123 than 190 rpm.

This is incredibly slow for a 5ft prop. I am not sure why you are getting best results with such a low cut in speed unless your prop is much lower tsr than you think. Certainly you are more in the speed range of the 8ft prop and whatever happens the large prop will have far more power. I am not sure that such a tiny alternator is going to hold down an 8ft prop so you will need to make every attempt to make it furl as early as possible. In low winds you will be way ahead but you will need to watch it in high winds.

Flux

[ Parent ]

Low amperage output | 11 comments (11 topical, 0 editorial)

Menu

· create account
· How to use the board
· FAQs
· search the board
· Google search the board
· Old Otherpower Board

Login

Make a new account

Username:

Password:

You must be a registered user to post here. It's easy and free, and the link is on the upper right side of your page.
All trademarks and copyrights on this page are owned by their respective companies. Postings are owned by the poster, but may be deleted or moved at the ADMIN's sole discretion. The Rest © 2003 Forcefield.
You can Email the board ADMIN here. PLEASE include the username you signed up with!