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A big PMG?


By hvirtane, Section Wind
Posted on Wed Feb 02, 2005 at 02:43:42 PM MST
Some time ago there was a discussion about Hugh's new big generator

Hello,

I remember that some time ago we discussed
Hugh Piggott's new big 'Nirvana' generator.

Now I cannot find that discussion here,
neither at Hugh's own web pages.

Who can help us with this?

We are planning here in India
to make a generator of about 5 kW.

- Hannu
 

A big PMG? | 3 comments (3 topical)

Re: A big PMG? (3.00 / 0) (#1)
by whiskey on Wed Feb 02, 2005 at 10:54:43 AM MST

There are plenty mills shown on this board with around 1Kw output. Take one of those, double the diameter of the magnetic rotor and get 4x the output. This is assuming you make no other changes to the alternator.

Blades will be your biggest problem, I made a 4Kw down wind mill two years and that was a tough mill to match blades. Of all the attributes of mill building, blades have never been subject to much new design, taking aircraft profiles are scaling them for wind usage is simply incorrect. Start with low reynolds numbers, and then design. Blades that stall in higher wind speeds on dual rotor mills demonstrates this perfectly.

Most home brew mills shown in here, have pretty efficient alternators. But blades leaves em all down and mitigates our gain from good alternator design. Albeit at a magentic higher € cost, but worth it.

A word to the wise though, machines over 2Kw get very angry and are spectular when they let go. Build it 'well' and build it with good engineering practise, hose clamps, duct tape and cheap (or worse no) bearings will bite you!....and its a waste of good magnets :]

 



Re: A big PMG? (3.00 / 0) (#2)
by wind pirate on Thu Feb 03, 2005 at 09:37:13 AM MST

I have been following this project as well.

http://homepages.enterprise.net/hugh0piggott/nirvana/



Re: A big PMG? (3.00 / 0) (#3)
by hvirtane on Sat Feb 05, 2005 at 08:33:37 AM MST

Hello,

thank you for your info.
I also finally found this web site
by searching here at this discussion list.

I'm trying to make my friend here in
India convinced that we should build
a quite similar prototype.

Hannu

[ Parent ]



A big PMG? | 3 comments (3 topical)
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