# What prevents this magnetic perpetual motion device from working? [closed]

Two days ago, I thought of this device, which may seem to rotate indefinitely(in all 3 directions). I have two questions.

1. Is this perpetual motion machine already known? If it is, could you please give some references?
2. What is the exact mechanism that makes it stop? By this, I mean an explanation, not simply "because it would break energy conservation". Of course energy conservation is true, and of course cannot rotate indefinitely. But for any known (presumed) perpetuum mobile, there was an explanation, usually based on showing that the force generating the motion is balanced by another force.

I made a model in COMSOL of my device(first picture shows a view from the right side of the device, while the second shows it from above).

The device consists of a big magnet, a sphere and an insulator of magnetic field. The idea is to block the magnetic field around half of the sphere, so that only the other part of the sphere will be pulled. Everything is built with Armco iron.

The sphere is with radius 2 meters, and the information, which the program provides about the forces on the sphere are:

Axial torque (N*m) = -0.08622111144594605

Electromagnetic force, x component (N) = -1.069911296291055

Electromagnetic force, y component (N) = -1063.7242803838271

Electromagnetic force, z component (N) = -166.95389061849949

Torque, x component (N*m) = -17.99053531174359

Torque, y component (N*m) = 5.067797194981982

Torque, z component (N*m) = -0.08622111144594605

I would like to make some observations.

• I don't consider an enough explanation simply to refer to the energy conservation. I am interested in an explanation showing exactly how the magnetic forces making it rotate, are balanced.
• If the forces are balanced, only then friction will make it slow down and stop. I don't think that we can explain only by referring to friction, which in principle can be made as small as needed. There has to be a balance of forces.
• Why spending time trying to understand or explain something that admittedly can't work? Well, even though perpetual motion machines cannot actually work, I think they may be interesting as puzzles.

## closed as off-topic by Carl Witthoft, ACuriousMind♦, CuriousOne, Kyle Kanos, John RennieMar 28 '16 at 15:15

This question appears to be off-topic. The users who voted to close gave this specific reason:

• "We deal with mainstream physics here. Questions about the general correctness of unpublished personal theories are off topic, although specific questions evaluating new theories in the context of established science are usually allowed. For more information, see Is non mainstream physics appropriate for this site?." – Carl Witthoft, CuriousOne, Kyle Kanos, John Rennie
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## locked by dmckee♦Apr 2 '16 at 2:19

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• I cannot understand your devise, you have to label the figure. What is the mu metal, what is the sphere that turns, what is the magnet where is the axis . If energy is taken from the field, demagnetisation will be a problem. – anna v Mar 27 '16 at 15:30
• "theoretically..." is not true, nor is it a representation of how magnetic materials actually behave. And just where are you going to get a perfect vacuum? – Carl Witthoft Mar 27 '16 at 15:41
• I don't have the slightest idea what I am looking at. Please describe this machine in detail with a suitable drawing. Where is the extra energy supposed to come out? – CuriousOne Mar 28 '16 at 9:26
• If you want it deleted, press the flag button and use the custom flag for the moderator. Tell them you would like it deleted. Do not deface the post. – tpg2114 Apr 1 '16 at 22:30