Magnet rotating device


 For long time many people has tried to harness potential energy of the gravitational field of the Earth, with no result. Why?. Simple, because, after the potential energy is "captured" from a falling object, it is obvious the object must be moved in its initial position in order to use this object for obtaining the same energy the first time has been obtained. But for this action it is necessary the same amount of energy (not considering frictions) as those gained from the object. Hydroelectric generators are an example of harnessing potential energy of gravitational field of the Earth. They are using potential energy of the water, only the water it is placed in its initial position by the Sun.

 Of course, the object can be moved in its initial position without spending energy, if it is shielded against gravitational field of the Earth. Unfortunately, there are no possibilities to shield gravitational field.

Fig. 1


 But, there is a field that can be shielded - magnetic field. Using a simple piece of ferromagnetic material, the interaction between two magnets can be canceled.

 This is, of course, a comparison for only to have a better picture of the idea. The magnetic and gravitational forces and fields are completely different in all other aspects except that are both fields and forces respectively and supports no further comparison.

 Let see now what's happened in this case. If two magnets are approaching each other (fig.2), repulsing force appear, having same magnitude as the force that act on magnets when they are move away from each other (fig. 3).

Fig. 2

Fig. 3


 So, if we place a piece of ferromagnetic material between two magnets, when they are approaching to each other, the interaction between them will be repealed, the force, and so the energy needed to get closer the two magnets will be zero (regarding, of course, direct interaction between magnets and regardless of magnet-shield interactions) (see fig. 4).

Fig. 4


 Of course, there is interaction between magnets and ferromagnetic shield, in which interaction result input or output of energy.

 Let see in detail what are the inputs and outputs in this case, in other words, the forces that act over the moving parts, and resulting force of all this forces.

 Let consider the initial situation (fig. 5  Position1). The magnet M1 is approaching magnet M2, and the magnet shield MS is approaching magnet M2 also. First, there is an attraction between MS and M2 (force F1), and then an attraction of the same magnitude between M1 and MS (force F2, Position 2), F1=F2, because the two magnets are identical and MS is enough thick to allow the fields of the two magnets to cross trough (to shield the magnetic fields), so, there is no interaction between magnetic fields. After the two magnets are aligned, the magnet shield MS is pulled-out (Position 3), the two forces acting over him are F3 (equal to F1) and F4 (equal to F2). So, the forces acting in one direction are F1, F2 and F5 (F5 - being the interaction force between the two magnets, when MS is not present between them), and the forces acting in opposite direction are F3 and F4. The resultant force will be:

F1+ F2 + F5 - (F3 + F4) = (F1 - F3) + (F2 - F4) + F5 = F5 ≠ 0


Fig. 5


 The resultant force on MS is zero. To see more clearly why, let analyze interaction between MS and two static magnets (fig. 6).

 When MS is approaching to magnets (Position 1), F1 and F2 accelerate MS because they acting on moving direction of MS. When MS changes direction (Position 3), same forces F1 and F2 decelerate MS, so the overall action on MS in one cycle is null.

 If the magnets have a certain configuration then this is true no mater if they are static or they are moving.

Fig. 6

 So, all we need to do is to realize a device that will accumulate the energy of interactions in one direction and release this energy when opposing forces (opposing to moving direction) appears.

 In the next animation you can see how can look like this kind of device.


 The main parts of this device are (see the pictures below):


Stator of the device, with 4 magnets

 Magnet shield and a sprocket wheel on shaft

The rotor with sprocket wheel

Flywheel and a sprocket wheel on shaft

 The magnet shield will shield the magnets of the stator and rotor while same magnetic poles are approaching to each other or opposite magnetic poles are moving away from each other, and will let the magnets to freely interact when opposite poles are approaching each other or same poles are moving away from each other, as shown in the pictures below. The magnet shield is rotating counterclockwise and the rotor, clockwise. Also, are shown the forces acting between the rotor and stator magnets.

 Resultant force acting between magnet shield and magnets (rotor's and stator's), is obviously zero, as shown above (fig. 5).

Position 1 - initial

Position 2 - start rotation



Position 3

Position 4

90 degree rotation (clockwise for rotor, counterclockwise for magnet shield)

180 degree rotation
Position 5
270 degree rotation

 The purpose of the flywheel is to store the energy gained in direction of movement and to return this energy to the moving parts (magnet shield and rotor) when opposite forces (to the moving direction) are acting over the moving parts. For that, the flywheel must have a higher spin, so the sprocket wheel on the shaft with flywheel will be smaller then other two sprocket wheels.

 The sprocket wheel of the rotor and the sprocket wheel on the shaft with magnet shield must be identical in order to synchronize the spin of the rotor and magnet shield. The rotor freely spins on magnet shield's shaft.


  • Of course, this is a simplified approach of the processes that occur with the magnets and shield interactions. In fact these interactions are much more complex, complexity given by the disturbations of the magnetic field lines, which phenomenon is not tackled in here because of need for simplicity for better understanding.

  • Also the use of notion  'interaction force'  above, is for simplifying purposes only. Much appropriate would be using the term 'energy' instead of 'force', but this would require a detailed and complex approach.

  • Shielding is not the best term for describing the interaction between magnets and ferromagnetic disk. As you know, a ferromagnetic material became magnet with opposite pole facing to the magnetic field that traverse it. So the appropriate term for magnet-disk interaction is 'guiding' or 'switching' instead of 'shielding'.

        Anyway, the overall results of the processes developed in the device are these presented above.


 Supposing the useful energy gained in the magnets and shield interactions is to be very small but existing, few issues must be carefully approached in order to maximize useful energy and so the chances for building a workable device:


 Now let's take a closer look what's happen when this device runs, to see what is the best configuration for magnets and shield in order to obtain maximum efficiency meaning maximum useful force with minimum friction.

 As you can see, the maximum useful force in the above configuration is in the point were one whole rotor magnet is shielded and the other one freely interact with two stator magnets, as shown above in any of position 1, 3, 4 or 5.

 Of course, different versions of this device are possible.

 Here is one of the most simple  and interesting one:



 Why it doesn't work?

 Well, first of all

  1. the friction is to high. As you can see the device stops after few seconds of spinning. Even if the device would not work, it should spin for a very long time after the initial impulse, because of flywheels and big central wheel. It doesn't because of to high frictions.

  2. the flywheels are under dimensioned. They are way to small to store all energy in the device.

  3. the magnet shield is an iron plate, so the eddy currents are significant, impeding the rotation.

  4. useful interaction between magnets is to low due to high distance between them when they are not shielded.

  5. the stroke of the magnets is way to big, so part of the magnets ride is just a loose of energy in friction, because the interaction between magnets is significant only when magnets are at a small distance to each other. When distance increase over a certain value, friction overcome the useful interaction so in this part of the stroke there will be only energy losses with no useful work done.




 You may find why I think this device could work by visiting this page:



29-05-2008 T. Augustinov

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