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

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