Permanent magnet motor

[ayeaye]

Now another stable position on the picture below. This time the other end of the pencil was only 20 mm on the cigarette pack. But this time the pencil had some extra weight of lead on it. It seems though that there is a small stable spot between these magnets. But if so, it's very small, and going slightly out of it, makes the end of the pencil to fall to some of the magnets.

That's all the experiment i can do with this arrangement i think. Who can think about some other ways, would be welcome to experiment some more.

[guest1289]

What your'e trying to build,   and modify to get around  "Earnshaws Theorem"  is called   'Mendocino' bearing or motor or system .

I know you can't waste more time building that,  since it's outside of your usual field  'electronics' .

(  I assume you look at the  youtube videos of this bearing  )

(  Sorry that I can't build anything,  there's nothing I can do to change that  )

However,  I have sent you some  important  further information in a message

[ayeaye]

Thank you for Mendocino, no, i didn't know that before, but it is slightly different. The Mendocino bearing is made so that lengthwise there is a push only to one direction, and the end of the pencil goes against some glass or something, and rotates on that. I suggested that it can be stable also lengthwise, but couldn't completely prove it, as the possible stable spot seems to be very small.

The Nikolayev trailer hitch is another possibility of course, when the rotor hangs from it or something. This is really a stable system for magnetic bearing, and can be used. The only problem, it needs a very big ring magnet, or maybe it can be a disc magnet, but it has to be big, so it easily interferes with any magnet motor there can be on the rotor.

[ayeaye]

But Mendocino bearings, they can be used in magnet motors, when the problem is not completely solved. They have a kind of one pin bearing (a needle against the surface), yes. But the force to that bearing is very small. It is much smaller than all the weight of the rotor were on the bearing, the force is very small, it is just to keep the rotor lengthwise in balance.

Enough for a practical solution, i think. I didn't want to solve any theoretical problems, but as i didn't know about the Mendocino bearings, i had to figure it out. And in the process i happened to find that there may be some way how such bearings may be completely in balance, that is completely in the air, with no physical contact.

[guest1289]

I have sent you another message about this bearing, and connected things,  you'll see in the message