TheBackShed.com

Forum Index : Windmills : staggered groups of windings

Author

Message

brucedownunder2
Guru

Joined: 14/09/2005
Location: Australia
Posts: 1548

Posted: 11:18pm 12 Apr 2009

Copy link to clipboard

Print this post

Hi,, I think it was some time back ,,, but did anyone have success with the idea of staggered groups of windings for different cut-in voltages and outputs.

If so , could you share the results with us ,please.

Thanks
Bruce

Bushboy

Gizmo

Admin Group

Joined: 05/06/2004
Location: Australia
Posts: 5123

Posted: 12:17am 13 Apr 2009

Copy link to clipboard

Print this post

Hey Bruce

Yeah that was me. Full thread here http://www.thebackshed.com/windmill/forum1/forum_posts.asp?T ID=749&KW=staggered

It seams to work fine, cut in speed is about 40RPM, in light winds its making a 1 to 2 amps for most of the day. The tail did furl too early, at around 16 amps.

I'm using it now on the new extruded blades, so far its working good though only seen 5 amps to date, really missing out on all the wind lately, even the Southern Cross is struggling to pump any water. Very tempted to fire up the chain saw and cut down a few tree's, but I want to sell the place later this year so need it looking its best.

If you have a spare stator I would recommend you try it.

Glenn

The best time to plant a tree was twenty years ago, the second best time is right now.
JAQ

brucedownunder2
Guru

Joined: 14/09/2005
Location: Australia
Posts: 1548

Posted: 02:05am 13 Apr 2009

Copy link to clipboard

Print this post

Thanks Glenn,,

I'm re-wiring a 60 at present,,cold and wet ,,so good to do these things .

I will certainly follow your instructions and re-wire a 80 ,and maybe a 100 .

Have you found a good wind block yet,,,?
Thanks
Bruce

Bushboy

KarlJ

Guru

Joined: 19/05/2008
Location: Australia
Posts: 1178

Posted: 08:38am 09 Nov 2009

Copy link to clipboard

Print this post

OK here's an interesting one.

If you were to re-wire 1/2 for star and half for delta
would you still need a separate set of rectifiers for the two halves....

The advantages of dual stator with only one stator.....

Karl

Luck favours the well prepared

GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 12:54pm 09 Nov 2009

Copy link to clipboard

Print this post

Yes. 2 sets of rectifiers are needed as the delta windings would effectively short the star windings, if connected together.

Gordon.

become more energy aware

KarlJ

Guru

Joined: 19/05/2008
Location: Australia
Posts: 1178

Posted: 02:00am 10 Nov 2009

Copy link to clipboard

Print this post

Sounds like a winner
-outside the box a little -I like it!

80 series 1x7c + 1x7c delta.

are the 680uf 450V back to back caps on each set
still going to work or have I now over capped?

Karl

Luck favours the well prepared

GWatPE

Senior Member

Joined: 01/09/2006
Location: Australia
Posts: 2127

Posted: 11:02am 10 Nov 2009

Copy link to clipboard

Print this post

I would wire the mill, both windings in delta. Makes better use of the wire to give a lower alternator winding resistance. Cap voltage multipliers take care of the cutin rpm and the low end wind loading while maintaining high performance at the top end with the lowest coil resistance when the current is max.

Gordon.

become more energy aware

KarlJ

Guru

Joined: 19/05/2008
Location: Australia
Posts: 1178

Posted: 12:00pm 14 Nov 2009

Copy link to clipboard

Print this post

I knew that was coming......

delta 1.7times the cutin, voltage doubler 1/2 the cutin, already ahead so delta is a wise decision.

What sort of cutin would you expect?
ie windspeed with 2.5m blades and single stator.

Luck favours the well prepared

Print this page

To reply to this topic, you need to log in.