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Afghan designed permanent magnet alternator
By cslarson, Section Wind Posted on Thu Aug 14th, 2008 at 11:53:00 AM MST
submitted on behalf of an afghan colleague

Hello all,
This post is on behalf of an afghan colleague (Daud) here in Kabul. He has designed and built this alternator in his own time with his own resources, for operation with a 4-meter diameter rotor. I believe it has 16 coils and 20 poles and that he is planning 16 phases. Small bolts were set into the resin of the stator and anchor it to the other half of the wheel rim.

I commented to him that I thought the offset from the tower axis was too small. I'm sure he would be happy if I passed along any comments that you had.
Thanks,
Carl

Afghan designed permanent magnet alternator | 8 comments (8 topical, 0 editorial)

Re: Afghan designed permanent magnet alternator (3.00 / 0) (#1)
by blueyonder (windwoodgood at yahoo dot co dot uk) on Thu Aug 14th, 2008 at 06:22:25 AM MST
(User Info)

hi carl thanks for posting.
the pics are great. just looking at the stator its impressive.
i have never seen anything like this and made from old car bits aswell.

i know afghan is a dry country. but this looks like a good turbine to
work on hydro .

as to the offset i am not sure. i am only learning myself. i am just fallowing
plans from others. but getting great ideas all the time from others.

tell daud i am saving the pics to my pc.
i wish him luck and thank you again. john.
its a ill wind that dos no good

Re: Afghan designed permanent magnet alternator (3.00 / 0) (#2)
by oztules (oztules__at__bigpond.com) on Thu Aug 14th, 2008 at 06:42:13 AM MST
(User Info) http://www.anotherpower.com/gallery/Oztules-toys

Damn fine effort. Inspirational, and has done what I have pondered but put in the too hard basket.

It is probably a hard way to make a dual magnet machine, but it is a way all the same.

........oztules
Flinders Island Australia

Re: Afghan designed permanent magnet alternator (3.00 / 0) (#3)
by Flux on Thu Aug 14th, 2008 at 07:01:55 AM MST
(User Info)

From the pictures I can't see how the magnetic circuit is done. Certainly it looks as though there is no iron closing the circuit of the inner magnets.

May also be true of the outer magnets, I am not sure if that is a steel band or just non iron reinforcing.

To be effective the outer magnets need to be on the inside of a steel drum and the inner ones need to be on the outside of a similar drum.

Otherwise it looks good. Much more challenging than axial construction but every bit as good in other respects.

The 20 magnet 16 coil is a strange combination but with enough rectifiers it will work.

Flux

Re: Afghan designed permanent magnet alternator (3.00 / 0) (#6)
by cslarson on Thu Aug 14th, 2008 at 11:40:51 AM MST
(User Info)

thanks for the response.
the outer ring of magnets are on the inside of a band of steel from a pipe. the pipe was originally something like 15mm thick and he had it machined down (to 6 or so i think). i think that piece of steel set him back $60. the inner ring of magnets are attached to the rim of the wheel covering about 70% of their face. so i believe there is magnetic circuit but i would not really know if it was enough or to what degree it might hamper the performance.
the plates for the axial construction were going to cost about $100 each. i would say that cost was the main motivator for taking this approach, though he also saw what i had done with the induction motor conversion and thought it was less efficient because the coils are faced by magnets on only one side. he said it took him 2 months to make this. i have yet to hear him say how much he would want for one though i am interested.

[ Parent ]

Re: Afghan designed permanent magnet alternator (3.00 / 0) (#7)
by Flux on Thu Aug 14th, 2008 at 02:09:27 PM MST
(User Info)

The 6mm steel on the outer magnets will be ok. The inner circuit is far from good but much better than nothing. I think it should work OK.

Flux

[ Parent ]

Re: Afghan designed permanent magnet alternator (3.00 / 0) (#8)
by vawtman (vawtman(at)charter(dot)net) on Thu Aug 14th, 2008 at 04:36:04 PM MST
(User Info)

Hi Carl
Did he run a test coil before building the stator?
Are the mags the standard 1x2's N?
How are the blades hooked up?
Do the stator bolts(steel) enter the mag feild?
Why the 20/16 arrangement?
What diameter is the inner rotor?

Anywho very nice and sorta what i'm building.Just hope mine is has pretty :v)

Mark

[ Parent ]

Re: Afghan designed permanent magnet alternator (3.00 / 0) (#4)
by RUFUS (RFRUFUS@AOL.COM) on Thu Aug 14th, 2008 at 07:04:14 AM MST
(User Info)

And another exciting episode of
Thinking outside the box
real nice work Daud
Rufus

Re: Afghan designed permanent magnet alternator (3.00 / 0) (#5)
by electrondady1 on Thu Aug 14th, 2008 at 08:53:55 AM MST
(User Info)

as flux pointed, out more steel could be applied to the back of the inner rotor.

casting that stator must have been a challenge.
but it looks as though it turned out right.
i was puzzeled by the method of attachment for the inner and outer rotor
but i realized they would work as cooling fans. clever.
congratulations daud !

[ Parent ]

Afghan designed permanent magnet alternator | 8 comments (8 topical, 0 editorial)

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