Dream about magnet motor - sketch included

[broli]

That said I had a dream once of a gerotary style magnet motor, but it is an impossible design, which work if it was possible to make. Isn't that irritating? You finally design a working magnet motor but it is impossible to make it.
http://www.youtube.com/watch?v=LDRorMyxdO0&list=TLRctGafDgs-4
Vidar

Coincidently my current research has led me to a similar concept, although it's not wise to speak before one has nothing to show. A 3d printer helps a lot with these kind of things .

[Low-Q]

Coincidently my current research has led me to a similar concept, although it's not wise to speak before one has nothing to show. A 3d printer helps a lot with these kind of things .

The structure of the design isn't impossible, but keeping the magnetic orentation the same in the outer magnet as it rotates.

The simulation in FEMM prooved that the torque in both rotors was the same if the outer rotor was a permanent magnet. The inner rotor spins 20% faster due to gear ratio so the energy in that is 20% more than the outer rotor. However, in order to keep the magnetic orientation of the outer magnet it needs to be made of iron and magnetized externally. If I do that in FEMM it will not longer work.

Vidar.

[broli]

The structure of the design isn't impossible, but keeping the magnetic orentation the same in the outer magnet as it rotates.

The simulation in FEMM prooved that the torque in both rotors was the same if the outer rotor was a permanent magnet. The inner rotor spins 20% faster due to gear ratio so the energy in that is 20% more than the outer rotor. However, in order to keep the magnetic orientation of the outer magnet it needs to be made of iron and magnetized externally. If I do that in FEMM it will not longer work.

Vidar.

The main problem in your design is having the inner permanent magnet rotor so close to the the outer iron rotor, the field of this magnet will overpower any external field wanting the iron magnetized as shown in the video. You just need to cleverly alter the design. A possible hint: the inner permanent magnet must be much weaker than the external permanent magnet magnetizing the iron.

[Low-Q]

I have simulated with many different magnets strengths. It does not help.


The reason it doesn't work is that an iron ring will guide the external magnetism along the iron shape instead of having the magnetic polarization straight as inside a permanent magnet. So the iron ring acts more like a magnetic shield for the inner magnet instead of applying the inner magnet with attraction and repulsion.


Vidar

[broli]

The reason it doesn't work is that an iron ring will guide the external magnetism along the iron shape instead of having the magnetic polarization straight as inside a permanent magnet. So the iron ring acts more like a magnetic shield for the inner magnet instead of applying the inner magnet with attraction and repulsion.
Vidar

This is true but this is due to lack of proper design. When you use magnets on both sides the field will follow a near straight path through the iron. See below simulation where an iron piece is sandwiched between magnets.