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Small axial genny
By Peppyy, Section Diaries Posted on Fri May 13, 2005 at 11:28:12 PM MST
A learning experience before the big one.

I have the mags, 1x1/2 round n48s.
I have the wire, #16.
What the heck can I use to hold the magnets? I remembered reading about someone using saw blades and as luck would have it I dug some up. (Literally, while diging a hole for the tower.

I know they are really rusty but it's what you got for the moment. I learned not to forget the magnet in your left hand when moving one with your right.

Pretty crude test rig but it seems to do the trick.

9 Coils of #16 wire, 55 turns. Now I need to review my 3 phase theory and figure out which gives better voltage. Y=amps, Delta=volts?

Small axial genny | 6 comments (6 topical)

Re: Small axial genny (3.00 / 0) (#1)
by DanB on Sat May 14, 2005 at 08:03:23 AM MST

'Y' will get you higher voltage and higher resistance so less current ('amps')
Delta is the opposite but may be a bit less efficient overall.
Better to find out exactly how to wind your coils to get the desired results in Star 'Y'

Re: Small axial genny (3.00 / 0) (#2)
by ghurd on Sat May 14, 2005 at 08:34:27 PM MST

Hey Pep!

Glue. Zubbly now likes some kind of Loctite. Epoxy is good too. Somebody is using a construction adhesive.
JB Weld crawled all over the magnets for me, with a round mag rotor and flat mags in a conversion. Hell of a mess for hours.
I will never try JB again for mags!
Ed uses it, at least for flat to flat surfaces, and says 'just a little.'
Maybe I used too much, but it sucked all the glue from the rotor and covered the mags.

How are the bearings done in the test setup?
Looks like the sawblade and wood arm are solid.
G-
Ghurd.info

Re: Small axial genny (3.00 / 0) (#3)
by Jessum Dumguy on Sun May 15, 2005 at 05:13:29 AM MST

Bearings?
What Bearings?
He Don't Need No Stinking Bearings. :-)

I Think thats what he ment When he said " PRETTY CRUDE ",
Looks like the blades just free spin on the threaded Rod/Bolt.

.
Chaos reigns within. Reflect, repent or reboot. Order shall return.
[ Parent ]

Re: Small axial genny (3.00 / 0) (#4)
by richhagen on Mon May 16, 2005 at 08:24:43 PM MST

That looks pretty similar to my saw blade attempt. Even down to the magic marker lines on the rusty blades. If you can find bearings with a center hole to match the threaded rod, then you can rig it with a bearing pretty easily. With your setup you can rig a bearing by drawing its circumfrence centered on the saw blade and on a washer with a hole in the center larger than the nuts that you are using on your threaded rod axle. Mark and drill 4 small bolt holes at 90 degree angles on the washer and the saw blade so that the entire circumfirence of the bolt is just outside of the circle for the bearing. Do the same thing for the washer. slide the 4 small bolts through the holes in the saw blade. The bearing should fit snuggly between them. then slide the washer over the top and fasten the nuts on the 4 small bolts with lock washers. Now if everything lined up properly, you can slide the whole contraption over the threaded rod, and secure its position on the rod by placing a nut, locking washer, and another nut on each side of the saw blades position and snugging it up. The nuts should tighten against the inside ring of the bearing and the center holes in the saw blade and the washer have to be large enough to spin freely around the nut, but small enough to catch the metal outer ring of the bearing. Rich
'A Joule saved is a Joule made'

Re: Small axial genny (3.00 / 0) (#5)
by Peppyy on Tue May 17, 2005 at 05:05:49 AM MST

In the test setup there is a pile of washers on the threaded rod. Turn the crank, (Chunk of wood) and read the meter. I think the air gap was clost to 1/4".

I am thinking it might be worth it to put a few bucks into it and buy a piece of steel to replacer the rusty blades, or maybe grab a strut of a geo metro or something. If I go with the threaded rod as the shaft I think I will pick up a couple pillow blocks with set screws 5.95 ea. on e-bay, $12 with shipping. http://tinyurl.com/ch452

Oops, those are the 1" but it's about the same for the 1/2" or 5/8".

I am not sure I will ever get 12v out of this without going to a dual rotor setup or higher rpm? For that I think I want at least 3/16" plate for the mags. I am still in awe of these little buggers. At 1" by 1/2" thick you can stick one on each side of your hand and they will stay. I can just imagine 24 of them pulling at the same time.
Pep

Re: Small axial genny (3.00 / 0) (#6)
by hiker on Wed May 18, 2005 at 10:52:55 PM MST

heres my 12" dual rotor before self destruct...........

WILD IN ALASKA
[ Parent ]

Small axial genny | 6 comments (6 topical)

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