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Tiny Rotors
By Tritium, Section Wind Posted on Sat Oct 03, 2009 at 05:19:10 PM MST
20 Pole Alternator

Here is a start of a new toy project I am working on.

It will be a 20 Pole 15 coil 3 phase axial flux machine.
Shooting for a 12V system. Wire from old degaussing coils about 26ga or
I have a spool of 32ga if the bigger wire won't fit. I figure a gap of .15" as
the magnets are .06" thick.
I am planning to use an old spinning reel for the drive section with
blades attached instead of the crank. Thinking 18" swept area.
Hey Ben (gotwind) are you seeing this? :)
Thurmond

Tiny Rotors | 6 comments (6 topical)

Re: Tiny Rotors (3.00 / 0) (#1)
by gotwind2 on Sun Oct 04, 2009 at 06:50:38 AM MST

Hi Thurmond.
I can't see how you can get 15 coils in there?.

Board member frefdx made me a 6 coil stator, dual rotor and that must have been a challenge, full story here.
http://www.fieldlines.com/story/2009/8/1/145251/4544

It's fun trying these small in size projects, but as flux always tells me, efficiency goes way down at such a scale.

The best one I made was this 2 pole design, 10 watts at a push
http://www.gotwind.org/diy/12-inch-mini-turbine.htm

Good luck.

www.gotwind.org

Re: Tiny Rotors (3.00 / 0) (#2)
by frepdx on Sun Oct 04, 2009 at 10:26:40 AM MST

that looks like a fun project.

What are you planning to use for blades?

Re: Tiny Rotors (3.00 / 0) (#3)
by Tritium on Sun Oct 04, 2009 at 02:47:43 PM MST

One of the board members (richhagen) has some small blades I plan to use when I receive them.

Story with the blades is here:

http://www.fieldlines.com/story/2009/4/29/165453/336

Once again its a toy and it will be a challenge to get 15 coils in the space available.

Thurmond

[ Parent ]

Re: Tiny Rotors (3.00 / 0) (#4)
by Tritium on Wed Oct 07, 2009 at 08:41:55 PM MST

Nobody noticed my big mistake. Look at the left rotor in the picture. Yep, 21 instead of 20 magnets.

Since this will be very low power I am thinking of trying to "print" a stator (etched printed circuit board). It might be more fun than winding and wiring 15 tiny coils and potting them.

Thurmond

Re: Tiny Rotors (3.00 / 0) (#5)
by ghurd on Thu Oct 08, 2009 at 04:59:03 AM MST

Wow thats small!
What size are those magnets?
G-
Ghurd.info

Re: Tiny Rotors (3.00 / 0) (#6)
by Tritium on Thu Oct 08, 2009 at 07:32:49 AM MST

Magnets are .06" thick and .19" diameter N45 grade.

Thurmond

Tiny Rotors | 6 comments (6 topical)

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