FM Concepts posts working video 4/7/2009

[wattsup]

Look.

[deseret]

It needs to be Independently Verified or be Mylowed!

[magnetman12003]

If what I am seeing is true then it looks like all 16 rotor magnets have to be installed one by one with the glue drying before installing the next magnet.  Fighting repelling forces all the way.  How much room for error is anyones guess.

  If the device doesnt work out then the magnets will haver to be broken out of the rotor cement to save them???

The rotor might be able to turn if correctly constructed but it also will bounce up and down.

Essentially it becomes a "rotor floater" or a huge bouncing self spinning  magnetic bearing.    Any comments?? 

[DMBoss]

If what I am seeing is true then it looks like all 16 rotor magnets have to be installed one by one with the glue drying before installing the next magnet.  Fighting repelling forces all the way.  How much room for error is anyones guess.

  If the device doesnt work out then the magnets will haver to be broken out of the rotor cement to save them???

The rotor might be able to turn if correctly constructed but it also will bounce up and down.

Essentially it becomes a "rotor floater" or a huge bouncing self spinning  magnetic bearing.    Any comments??

Yes installing magnets is always tricky.  But why would you need to break them out?  Such small magnets are less than a dollar each, or even if they are a dollar or two each, breaking or chipping them to save a few bucks - is that worth it?

No it won't bounce up and down!  Proper 3D magnetic simulations of his geometry reveals the upwards force from the stators on the rotor, does indeed vary from one stator to the other, depending on which part of the rotor's "ramp" is at that stator.

But the rotor itself is close to 300 grams, if the disc is stainless and the magnet mass.  the upwards force at these gaps is about 1-2 Newtons, and a Newton is 102 grams.  So no the rotor won't "lift off".

However this WILL reduce the bearing friction as weight is reduced on the bearing contact surfaces!

And I will say this, small changes in geometry, will be extremely sensitive to whether a replication will work or not - the net or average torque is extremely small - amounting to about 10 milliwatts of shaft power to maintain around 100 rpm with a good bearing and this mass.

So get just one aspect of the magnetic geometry wrong, and you will miss the working envelope.

Unfortunately many imperfections of this chap's machine are going to be very tedious to replicate.  Such as his rotor disc appears not to be true or round, and the bearing appears to be pressed into it's bore on the disc at a slight off axis angle. 

And the chamfer on the disc is of a varying width, indicating his lathe did not hold the part square and true!

And various of the vertical magnets are not - vertical as you pointed out about one that appears to have cracked in half inside the rotor.

He gouged out the holes for the angled magnets in the rotor disc by side loading a drill bit into a perpendicular hole - and that is VERY imprecise.

Also the mass distribution of the rotating assembly is unbalanced, from gravity's point of view, and from the moment of inertia of the gyroscopic effects of the varying side force applied by the stators to the "gyro".

This is not as "simple" as it appears to replicate!

DMBoss

[ramset]

DMBOSS

""This is not as "simple" as it appears to replicate!""

In a way that is good news [been tried a million times before phrase comes to mind]

Chet