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Different Turns per Phase


By ghurd, Section Wind
Posted on Fri Dec 16th, 2005 at 06:04:08 PM MST
Splitting the difference between Delta and Star?

Exactly like a standard 3 phase.

But for example, 30 (A), 20(B) and 10(C) turns per phase, and a 12V system.
The `standard' stator for this stator would need 20 turns per phase.

First phases A and B would cut in,
Then phases A and C,
Then phases B and C.

The following are somewhere between questions and statements.

  1. Phase A could be small wire, B medium wire, and C large wire, thus balancing some of the resistance losses, while maintaining an even air gap.
  2. The higher cut in phases would have a much lower resistance value, increasing efficiency at higher RPM.
  3. Would get some power from lower wind speeds than normal, while getting a little more from higher wind speeds than normal... with a low speed machine.
  4. The violent switching between star and delta would be eliminated.
  5. Complex variable pitch blade or variable air gap assemblies would be at least less productive than a standard wired stator, percentage of gain speaking.
  6. Untwisted blades could operate more efficiently given their characteristics.
I pulled the numbers per phase out of thin air.

The guys who know how the fancy software works could probably say one way or the other in 2 seconds.

Another Old idea I can't discount quite yet.
Thoughts?
G-

Different Turns per Phase | 4 comments (4 topical, 0 editorial)

Re: Different Turns per Phase (3.00 / 0) (#1)
by Flux on Fri Dec 16th, 2005 at 11:14:55 AM MST
(User Info)

It worked after a fashion in the Air 303.

Has some of the disadvantage of single phase, high resistance winding becomes lossy in high wind and sometimes burns out.

Not something I would choose to do for a large machine, but may be worthwhile for a small one.

Not sure it is worth having 3 different windings, 2 identical and one with more turns would probably work as well.

Flux



Re: Different Turns per Phase (3.00 / 0) (#3)
by ghurd on Sun Dec 18th, 2005 at 11:36:40 AM MST
(User Info)

Air 303... didn't figure it was done commercially.

If I ever get a winding to burn out, that will be my biggest little success. LOL.
G-

[ Parent ]



Re: Different Turns per Phase (3.00 / 0) (#2)
by zubbly on Fri Dec 16th, 2005 at 12:32:49 PM MST
(User Info) www.zubbly.com

hello Ghurd!

just to add to the thought, having an unbalanced winding will also likely cause quite a bit of vibration, as well as the other problems Flux mentioned. i could be wrong, but don't think so.

a possible solution. connect your genny in delta and leave it there. pick a cut in speed which would suit the delta mode.

we have discussed quite a few times this concept on the irc chat.
one of our members there is "ibedonc" who builds a lovely voltage booster.

it basically takes your lower than cut in voltage and raises it so that you charge your battery. when the rpm becomes great enough in the genny to charge on its own, it electronically switches over to direct from genny. the voltage booster can be adjusted for whatever parameter you wish to keep it operating.

this would give you all the benefit of low wind speed charging plus the higher output of the delta connection.

join us sometime on the irc chat. everyone is welcome.

zubbly




Re: Different Turns per Phase (3.00 / 0) (#4)
by ghurd on Sun Dec 18th, 2005 at 11:53:45 AM MST
(User Info)

Vibration... I was more thinking along the lines of smaller machines. For something that would often be done single phase.

I will try irc chat when things slow down. I can't type fast or coherent enough for real time, and there is not much uninterupted computer time here.

BTW. Would you have interest in rewinding a motor like ugly20 and WideOpenSpaces in my files? 1 or 2 phase 6 pole.
It is 'small'.
G-

[ Parent ]



Different Turns per Phase | 4 comments (4 topical, 0 editorial)
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