Working Magnetic Motor on you tube??

[vipond50]

Here's a simple analysis (by using FEMM) of the torque of the rotor covering 45 degrees of the motion (then it repeats itself because of the symmetry).

When the fulcrum of the rotor and of the stator are connected with a line, and one of the magnets on the rotor is perpendicular to this line, the stator position shows a difference of about 25 degrees in respect of that line (as in the third Alsetalokin video). This fact is included in the simulation (visible here: http://www.metacafe.com/watch/1060658/oc_mpmm_magnetic_simulation/).

The simulation data and graph are included in the attached Excel document, and they show a total positive torque (it should be 0 if there were no self-rotation!). 

Sorry for any mistake I did! 

Verry interesting! I wonder if it would be possible to do this with an 18" rotor with all 13 stators in place, using gearwise rotation at the same rotation ratio. And could you post the FEMM/lua scripts as well?

Yes Oc that sim would be interesting to see the net gain of all 13 Stat's or can we assume the 220 ? is multiplied by 13 for the total net.

Best Regards
Bill

[MeggerMan]

Hi Niente,

I would simply say that in this configuration the rotor receives a push from the combined magnetic field of rotor and stator.

Very impressive lua script, very compact and to the point!

So group 1 (rotor) is rotated 45 Deg. and group 2 (stator) is rotated 180 Deg., the stator is rotated about the point x=105, y=0.
My laptop takes 4minutes 17 secs for 10 steps so 450 will take about 3 hrs 13 mins.
The total extra torque is 222 but this is the gain from 450 steps, so the average gain is about 0.5N per step - I presume the unit is Newtons?
I think I am right in saying that 0.5N is the equivalent hanging 25gram weight on a piece of string pulling on the circumference of the rotor and the same for the stator?
So the torque on the stator is very small compared to the rotor because of its relatively small diameter, therefore the bearings on the stator are so very very important.

The depth of simulation is 1 inch, which is a bit deep, maybe we should re-run with a depth of say 0.25 to  0.35 inches(to allow for the deeper stator magnet) and see what the total comes out as.
Also the scale is a bit odd, the rotor is massive 6.5 feet in diameter and the stator ring is 10" across (broken fingers, ribs, legs spring to mind), which may explain the peak torque of 1000N (100Kg push/pull).

[edit] Just started a re-run in mm instead of inches, seems about right size wise, but the torque is 1400 times less, so that 222 becomes 0.16 and that gives an average gain on each step of 0.00035 N, so thats 0.035 of a gram push/pull on the rotor/stator. Have you tried different start angles for the stator?
Maybe we can push the gain up a bit.[/edit]

Regards
Rob

[evil-doer]

Here's a simple analysis (by using FEMM) of the torque of the rotor covering 45 degrees of the motion (then it repeats itself because of the symmetry).

the first and last frames do not match up at all. the waves are completely different. could you make one that does 90 degrees for a full rotation of the stator?

[MeggerMan]

Here's a simple analysis (by using FEMM) of the torque of the rotor covering 45 degrees of the motion (then it repeats itself because of the symmetry).

the first and last frames do not match up at all. the waves are completely different. could you make one that does 90 degrees for a full rotation of the stator?

Hi Evil,
What graph are you looking at, first and last points are almost spot on the same....

Anyway what you can do is just run this script (set the properties to mm first) and wait.....for about 7 hours :

for i=0,900,1 do
   mi_selectgroup(1)
   mi_moverotate(0,0,-0.1)
   mi_selectgroup(2)
   mi_moverotate(105,0,-0.4)
   mi_analyze(0)
   mi_loadsolution()
   mo_hidemesh()
   mo_showdensityplot(0,0,1,0,"mag")
   mo_showcontourplot(40,-0.1,0.2)
   nome = "ocmpmm"..i..".bmp"
   mo_savemetafile(nome)
   mo_groupselectblock(1)
   mo_seteditmode("area")
   forza = mo_blockintegral(22)
   c=appendto("ocmpmm.txt")
   write(c,forza)
   write(c,"\n")
   flush(c)
end

Regards
Rob

[niente]

Hi,
if you don't care about making a movie of the simulation, you can avoid to save screenshots  .
Here's a simplified (and faster) script:

for i=0,900,1 do
   mi_selectgroup(1)
   mi_moverotate(0,0,-0.1)
   mi_selectgroup(2)
   mi_moverotate(105,0,-0.4)
   mi_analyze(0)
   mi_loadsolution()
   mo_groupselectblock(1)
   mo_seteditmode("area")
   force = mo_blockintegral(22)
   c=appendto("ocmpmm.txt")
   write(c,force)
   write(c,"\n")
   flush(c)
end

Now I'm working on a more precise model and simulation, and maybe I'll add all the 13 stators...