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neilbuster
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Joined: 09/11/2011
Location: Denmark
Posts: 2

Posted: 01:39pm 09 Nov 2011

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Hi!
I have this project:
http://www.scribd.com/doc/67055355/Battery-Charging-Wind-Tur bine
And my question is:
What can I use for the safety mechanism? I want to use a simple spring furling system but I am having some troubles with the calculation.

VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 11:34pm 09 Nov 2011

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Hi Neil

Furling is a a black art and it involves a lot of cut and try.

Starting point, generator offset on pivot 3 to 5 percent

Tail pivot hing 5 degrees lay back and 8 degrees side angle.

A lot depends on the type of blade you use.

All the best

Bob

Foolin Around

yahoo2

Guru

Joined: 05/04/2011
Location: Australia
Posts: 1166

Posted: 01:45am 10 Nov 2011

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Hi niel,

have a look on fieldlines.com there is a topic in the wind section, started by chrisolson called wind turbine transmission, you will probably have to go back to May or june to find it. He has some excellent photos that show the angles you will need to work with to make a spring furler work smoothly and predictably.

You may need to credit him as a source in your paper, there are very few others that have openly published their spring furling transmission turbines.

I had a quick peek at the project brief, the choice of a bosch car alternator as a power source is very disappointing.
there are a number of glaring design flaws.
it can not be bootstrapped it needs to consume power to excite the field windings.
alternator troubleshooting
Despite the tidy graphs supplied the chances that it will fully charge a deep cycle battery without some modification are slim the voltages are not high enough.( I can show you how to solder a diode across the voltage detection earth wire to increase this if you like)
the likelihood that a turbine with no electronic braking will survive in a 55 m/s wind are slim, even fully furled a decent set of blades will run away and explode

hurricane PMA
You could explore the options and point out why something like this would be more suitable in the "real world" edit : although I find the lack of DC current vs RPM data for charging 12,24 and 48 volt banks on their website disturbing

cheers

Edited by yahoo2 2011-11-11

I'm confused, no wait... maybe I'm not...

MacGyver

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Joined: 12/05/2009
Location: United States
Posts: 1329

Posted: 09:39am 11 Nov 2011

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neilbuster

Start here. Once you've ascimilated all this, maybe it'll make more sense and save you some time as you modify what you've already started.

Nothing difficult is ever easy!
Perhaps better stated in the words of Morgan Freeman,
"Where there is no struggle, there is no progress!"
Copeville, Texas

neilbuster
Newbie

Joined: 09/11/2011
Location: Denmark
Posts: 2

Posted: 11:43am 14 Nov 2011

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thanks for your useful answers, appreciated.

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