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Overunity Machines Forum



Magnet motor in Argentina

Started by Jdo300, March 19, 2006, 12:46:30 AM

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Omnibus

#425
April 06, 2006, 09:43:42 AM
silverdragonrs, I agree with you that tao?s explanation is very convincing and one of the best. As for concave surface, it is a surface curved inward ? imagine the inner surface of a glass. One would think that stator magnets with concave front surfaces would be the best in such construction because put together will best approximate an inner circle which will be equally outstanding everywhere from the outer surface of the magnetic rotor. Not so, turns out. tao?s and Stefan?s simulations using FEMM showed that flat facing surfaces of the stator magnets would provide more torque. 2tiger gave an explanation but I still think it?s puzzling.

Omnibus

#426
April 06, 2006, 09:48:17 AM
tjanzer, do you think at high rpms the lifting by the repulsive force would be reliable enough to ensure proper lifting? Synchronized lifting at just the same height is crucial for the functioning of the device. Otherwise, it would be great ? I never liked the spring idea. Would rather see it with small wheels and a ramp. Too many additional details, though.

dutchy1966

#427
April 06, 2006, 09:50:15 AM
Quote from: tao on April 06, 2006, 07:46:56 AM

Also, with the kind of torque we have seen in the FEMM modeling it is very hard to believe that this motor wouldn't work. .

Tao

Tao,

It seems from my femm calculations that you even get A LOT more torque when you lift more stator magnets ahead of the rotor. Can you please verify this with your femm models.
If I modify HartiBerlin models I get torques up to about 14 N/m instead of around 5 N/m!! The simulation lifted about 4 of the 8 magnets AHEAD of the rotor.
Femm model is attached....

thanx!

Dutchy1966

tjanzer

#428
April 06, 2006, 09:56:15 AM
Omnibus,

I just think you might need springs to help with the work to overcome the repulsive forces. I really don't like them either but at this point it sort of makes sense. Until my model is finished, I won't know if they are required. I am just looking into the drag of the motor and I think most of it naturally comes from the lifting and lowering of the stator magnets. Whatever could be used to reduce this drag will help performance.

TJ

tjanzer

#429
April 06, 2006, 10:05:02 AM
Omnibus,

Also, to answer your first question. At higher RPM the repulsive force may not be enough to complete the task. This is why I am using a track for the stator magnets. It is the same as using two top plates as in Tao's drawings and have the stator mags ride inside.

TJ
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