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Rotors spin each other.
By Jerry, Section Mechanical Posted on Fri Apr 11th, 2008 at 05:12:34 AM MST
1 ft. apart.

I had finished up these two rotors. I got them ready for a picture shoot.
I spun one to put its best side forward. When I did that the other 1 one ft away began to wiggel.
I move them to about 10" apart I could make the other spin slowly. It 8" apart they would spin in equal time and rpm now mater how fast they were spun.
It goes to show the aluminum sides aand stainless steel 6-32 screws were not slowing the magnetic flux down much.

JK TAS Jerry

Rotors spin each other. | 4 comments (4 topical, 0 editorial)

Re: Rotors spin each other. (3.00 / 0) (#1)
by fcfcfc on Fri Apr 11th, 2008 at 04:25:26 AM MST
(User Info)

Hi: I don't know if I would necessarily draw that conclusion for a whole bunch of reasons. I don't know where exactly you used your non Ferris metals, but generally the uses of such will be realized as negative if they are stationary in relation to the magnetic fields allowing the generation of eddie currents. As part of the rotors it will just reduce field strength depending on where they are used.

Re: Rotors spin each other. (3.00 / 0) (#3)
by richhagen (richhagen (a t) Juno.com) on Fri Apr 11th, 2008 at 05:31:30 PM MST
(User Info)

Jerry posted a couple of photos of the buildup of these in a post just prior to this one here: http://www.fieldlines.com/story/2008/4/11/5436/80877

Since the aluminum is spinning with the magnets there would be no flux change in them from the magnets. Magnetic fields generated by the current in the coils in a real alternator might have some effect, but they are on the ends of the magnets. I suspect that the screws might affect the pattern of the magnetic fields a bit, but I am not sure exactly how based upon the positions.

I would note that I can wire a couple of stepper motors together and the second will spin when the first one is spun, but they are not that efficient of generators. Still, Jerry's rotors there look pretty good to me as 4 pole rotors. I like Warrior's use of the steel outer shoe with multiple smaller magnets too. Rich
'A Joule saved is a Joule made'
[ Parent ]

Re: Rotors spin each other. (3.00 / 0) (#2)
by Warrior on Fri Apr 11th, 2008 at 05:56:14 AM MST
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Hi Jerry,

Nice work! I've held my magnets in place with steel shoes on top and a screw going through the shoe and threaded to a square armature. I tried both with bronze & steel screws.

I compared the output and it only made about half a volt less with the steel screws as compared to the non magnetic material.

This was more an experiment; the final armature looks much nicer :)
Warrior__ "Why can't Murphy's Law be used to my advantage??"

Re: Rotors spin each other. (3.00 / 0) (#4)
by Jerry on Fri Apr 11th, 2008 at 10:27:05 PM MST
(User Info) http://www.dplusv.com/Photo-03.html

I type with one finger. Last night aftera 1/2 hr of typeing and picture posting, I hit the post button and the puter said post failed.

I got to tell ya, thats real anoying for a one fingered guy.

Rich is right. The aluminum discs rotate with the magnets as do the stainless steel screws.

I had problems with the magnets poping loose with epoxy and no mechanical berier.

This aproch will keep the magnets inplace. I"m also trying LOARD Fuser metal bonding adhesive. This is the stuff that auto makers and body shops use to glue metal pannels together.

This stuff is a 2 part mixer and has very small glass beads, gose on gray and dryes green. I think it will be very strong.

At first mix its fairly runny. I'm going to try it casting coil stators.

JK TAS Jerry

Airheads Page

[ Parent ]

Rotors spin each other. | 4 comments (4 topical, 0 editorial)

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