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A radial design | 14 comments (14 topical, editorial)
Re: A radial design (3.00 / 0) (#9)
by oztules (oztules__at__bigpond.com) on Fri Feb 29th, 2008 at 04:25:37 AM MST
(User Info) http://www.anotherpower.com/gallery/Oztules-toys

Yes Glenn, I had a bit of a fiddle with these in a stronger guise here as well. Possibly the only solid one built so far I think. Dennis has it now.


Link is here if you want to ponder this style of construction. It may help to make an outer drum as Flux was alluding too.
The draw back with these particular ones was the high impedance output 15ohms in  star . A transformer or PWM would be required for these particular stators
http://www.otherpower.com/images/scimages/5171/seely.html

Have fun with it I did.

........oztules
Flinders Island Australia
[ Parent ]



Re: A radial design (3.00 / 0) (#10)
by Flux on Fri Feb 29th, 2008 at 06:06:30 AM MST
(User Info)

Yes this is the way to do it, the magnets don't fly off and you have a closed magnetic circuit with the iron core, a far cry from the open flux idea proposed with all the problems of keeping magnets on the outside of a cylinder rather than inside.

I have built several of these using neos, the biggest does about 1.5kW at 400 rpm, starts in about 3 mph wind with 10ft blades and is about 70% efficient at 1kW. It is matched to low winds with a boost converter and starts charging about 6 mph.

Not something that I would attempt without a lathe but if you are lucky you might find all the bits to do it without machining. I used the outside of a motor core for the laminated core. Adopting the wound wire idea would give you more scope to match the dimensions to a vehicle brake drum.

Hugh Piggott originally used this type of construction but I think the constructors had difficulty finding motor cores to suit the brake drums. He moved away to the axial design as it is easier to build with little facilities.

For those who can machine things then the radial has far more going for it than the axial construction but with a lot of facilities I would steer clear of radials. That includes motor conversions, very difficult without a lathe.

That Seeley thing is the correct concept, but it looks so bad mechanically that I suspect to would be better to start from scratch. The concept is much better than the F & P, nothing about which inspires me, but if they are cheap they must be tempting to someone.

Flux

[ Parent ]



Re: A radial design (3.00 / 0) (#11)
by Flux on Fri Feb 29th, 2008 at 06:09:40 AM MST
(User Info)

That should have said  " without a lot of facilities I would steer clear of radials"

Flux

[ Parent ]



Re: A radial design (3.00 / 0) (#12)
by Lumberjack on Fri Feb 29th, 2008 at 04:58:02 PM MST
(User Info)

engineering brushes would also be a problem for most.....

[ Parent ]


Re: A radial design (3.00 / 0) (#13)
by oztules (oztules__at__bigpond.com) on Fri Feb 29th, 2008 at 05:13:19 PM MST
(User Info) http://www.anotherpower.com/gallery/Oztules-toys

these are brushless alternators... if thats what you are referring to.
Flinders Island Australia
[ Parent ]


Re: A radial design (3.00 / 0) (#14)
by gizmo on Fri Feb 29th, 2008 at 07:33:52 PM MST
(User Info) http://www.thebackshed.com

The concept is much better than the F & P, nothing about which inspires me

OK, I'll bite. Why dont you like th F&P.

[ Parent ]



A radial design | 14 comments (14 topical, 0 editorial)

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