Magnet motor idea - again.

[Low-Q]

I have played with the sliding magnets idea. Sliding magnets from attraction to repulsion mode between arrays of magnets - inside the neutreal position. It does not work. The attraction and repulsion is OK, and the neutral position is OK, but when I try to slide the moving magnet from attraction to repulsion mode, the moving magnet oppose to swap side.


So I have changed the setup a bit - in theory. I did an experiment in FEMM, but again FEMM is pretty much useless to determind forces others than X and Y directions. However, the Y forces might be interesting in this setup to possibly determine the Z axis force in the experiment below.
You see the cross section of two opposite conical ring magnets. One stationary and one moving (A+B). The A+B magnet is a ring that is magnetized through diameter. Well, you see the polarity of all of them.


The arrows shows the forces between the magnets. At that particular position there is as much X force as Y force. The Y force interests me. That is the force which is repelling the magnet away.


There are two pictures, where picture two where the A+B magnet has turned 180 degrees - in repel mode. Not sure if you guys see this, so I have made a 3D drawing of the idea.

[Pirate88179]

OK. I'm not sure how you picture the "clamp together". Do you mean clamped together as the bar I have drawn in reply #3?


The fields between the moving and the stationary magnets are vertically aligned (South and north up or down), so it should not weaken the magnets the same way as when the field is opposing eachother directly south towards south for example....


I'll wait to see what Bill meant about this. Thanks for the input.



Vidar

Vidar:

Sorry for the delay in my reply.  Powercat pm'd me a while ago and I just now read and replied to his message.  I did not read all the way through this topic yet so, you may be past this....but just in case....

A few years ago I too two ferrite disk magnets and glued them (superglue) with like poles together.  (I do not remember if it was NN or SS)  Instantly, to my great disappointment, the two together acted like a single thicker magnet with one pole on each end.

My thought process was that it took work to bring them together and, the glue was constantly doing work keeping them together so, something cool might be observed.  I still have them stuck to my fridge and they still only have one pole on each end of the stack.  I hope this helps in some way.  I considered my experiment a failure but, I did learn something.

By the way, to cut the ferrite magnets you do need diamond tooling and, very important, a lot of coolant.  The coolant could be just water but you need to keep it cool to protect the diamond blade, AND, if you locally heat any part of the magnet above the Currie temperature....guess what?  No more magnet.  Just a hunk of ferrite.  It could be remagnetized but, that might cost more than getting new ones.

Best of luck to you on your new design here.  One never knows for sure unless you try.

Bill

[Low-Q]

Hi Pirate,


Maybe a tile cutter can do the job? Anyways I have a diamond cutter I can use too. The biggest problem is the shape.
To be honest, and realistic, I think I never can make such shapes to test the idea.


Vidar

[lumen]

Vidar,

The concept of the diametric cylinder rotating between two ring magnets could work. You just need to think of it in reverse, the important part is the part inside/ between the ring magnets. The part outside is used only for balance to allow rotation.

The main problem with the original concept is that the cylinder outside the ring magnets caused more rotational force than the part inside the ring magnets. Change this to always operate inside the ring magnets and rotate when enough has moved outside to balance the rotation.

Sorry I don't have time to do a sketch right now so I will try to get something in a few weeks weeks if you don't understand.