Magnet motor in Argentina

[hartiberlin]

These plastic strips magnets is like a big rubber band.
They have a constant Northpole at the one side and
a constant southpole at the other side.
There are some, that are about 2 to 5 mm thick,
10 mm wide and maybe he gut out 10 cm long to lay around his rotor.
So if he just has
cut an enough long band ( 10 cm maybe ) out of it and layed it into
the rotor it would be like a ring which you can see on his photo.

[Jdo300]

Hi Stefan,

Ok I see what you're talking about now, I have some of that strip stuff too. But if the rotor is one constant north pole magnet, then how is the rotor going to turn? there has to be some break in it somewhere to give the magnets somewhere to want to go. Otherwise it wouldn't care if there was a break in the outer ring of magnets because the pole of the rotor would be symmetrical on all sides. Am I missing something here

God Bless,
Jason O

[Omnibus]

Jason, I?ve been trying for some time to set up an experiment similar to that shown in the sketch. The biggest problem so far is finding a radially magnetized toroid with good homogeneous doughnut-shape field. I have axially magnetized toroids which are the usual type. They don?t do the job. A company agreed to make a radially magnetized one for about $2000 which I still don?t find justified before I?ve tried simpler (and less expensive) ways.

So far I?ve tried magnetized plastic strips just like the ones Stefan describes, bent in a circle. The problem with these strips is that their magnetic field is too weak. Also, it doesn?t appear that the field they create is homogeneous. I?ll get my teslameter in a day or two (unfortunately I don?t have with me now) to see what?s with the field. It appears that overall the field created by this strip, made into a circle, has poles. The rotor turns and sticks at a certain position.

This puzzled me. The doughnut shaped field should be axially symmetric and it appears that some unsuspected overlapping of fields had occurred which creates ?superpoles?. I don?t understand that. More likely, that problem appears due to inhomogeneities in the strip.

A similar situation is observed with a polygon made of 11 RadioShack magnets. The field is much stronger now but again appears non-homogeneous (in addition to that caused by the polygon). It appears that the individual magnets differ in strength quite a bit which may be the cause of the problem. Hope to be able to find better matching magnets when I get the teslameter.

With this 11 magnet setup the rotor again (as with the plastic strip) turns and stops, stuck at those newly created poles. When I hold this 11-magnet stator above the rotor I?m able to make the rotor turn by slight motions of the hand (which some suspect, I think unjustifiably, Snyder does in his video). This, of course, isn?t what we want.

It?s interesting to model this and I appreciate your effort. It, of course, puzzles me too that the model shows a good amount of force but little to no torque. What is the basis of this modeling? Is it based on finite element method or has some other underlying method? Could it be that for some reason that particular shape (toroid) couldn?t be modeled properly?

[Feb2006]

http://web.archive.org/web/20050319053449/http://club.telepolis.com/LICYTA/DESCRIPCIONDEFUNCIONAMIENTO.htm

[_GonZo_]

After reading in some other forums in spanish and looking at his pictures I have now more clear how it works "if it works"

Hi Gonzo,
could you please scan the spanish forums, if Torbay has already posted somewhere a video
of his motor ?
That would really help, if we could locate the video clip.
Many thanks.
Regards, Stefan.

Aparently there was a video on the web some time ago with the motor turning, but it is not there.
The video has been criticiase because it only shows the motor turning over grass and they asked him to lift it and show the bottom part of it.

I am going to check again to see if there is something new or I can get a copy of it.