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Author Topic: Self-sustaining DC Motor, using old 5 1/4" Floppy Drive Magnet  (Read 21372 times)


Offline pomodoro

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Re: Self-sustaining DC Motor, using old 5 1/4" Floppy Drive Magnet
« Reply #31 on: March 12, 2015, 07:13:17 AM »
Interesting, I saw that it was of a strange design, but did not know that it was.  Unfortunately that's the only small  motor I have around for now. it cost a fair bit too! . Staples do stick to the outside, so there is a bit of a field coming out.

One thing that this thread reminds me of is that of dangling two button neo magnets with thread far enough to interact but not to stick to each other.  (See Pic)
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you can make one rotate to and fro ,slightly, about the axis of the string an the other will copy, but the oscillations can keep going for more than half an hour.
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 A magnet by itself will dampen very quickly. 
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Obviously some kind of energy storage, but the duration is impressive.

Offline MagnaProp

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Re: Self-sustaining DC Motor, using old 5 1/4" Floppy Drive Magnet
« Reply #32 on: March 14, 2015, 04:19:58 AM »
Thanks sm0ky2 for the further info on your motor.
That's an interesting experiment  pomodoro. I'll have to give it a try.

I just tried the experiment and got no beneficial results. I only tried the unshielded side of the magnet so far facing the motor. My magnet is not balanced perfectly on the shaft so that may be adversely affecting it. Got the noticeable help from the flywheel effect but nothing substantial.  I used a smaller 3.5" Hard/floppy disk magnet. I used a TRAXXAS brushed motor #4578 from HobbyPeople hobby store.

Not saying there is no effect if someone figures out how to do this experiment like you did. I once tried to replicate a PMH that I saw on the internet work from a 9v battery but mine wouldn't work from a 9v battery. It only worked if a used a car battery which can supply many more amps so don't take the results of my replication as proving this doesn't work.

Hope someone can find the right combination. Attached are some pictues, yes I know they are bad quality, of the magnet I used. There is weak magnetism on the shielded side but no noticeable field lines show up. Only some field lines around the edge show up. The shielded side is noticeably much weaker than the unshielded side as expected.


Offline MagnaProp

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Re: Self-sustaining DC Motor, using old 5 1/4" Floppy Drive Magnet
« Reply #33 on: March 15, 2015, 12:58:22 AM »
Few more images. I only used three double A batteries for power for maybe I didn't spin it up fast enough? It Took about 4 seconds to get up to speed.