Thane Heins Perepiteia.

[RunningBare]

Hi:

blindsangamon is correct.  This is a common phenomenon regards "generators", but one often not commonly known about if you are not working with AC motors and generators all the time.  So the professor at MIT may not have this practical engineering savvy to identify the issues at first glance.

DMBoss

Now while I admit that I do not hang on the words of scientists/professors.

http://www.thestar.com/Business/article/300042

Contacted by phone a few hours after the test, Zahn is genuinely stumped ? and surprised. He said the magnet shouldn't cause acceleration. "It's an unusual phenomena I wouldn't have predicted in advance. But I saw it. It's real. Now I'm just trying to figure it out."

There's no talk of perpetual motion. No whisper of broken scientific laws or free energy. Zahn would never go there ? at least not yet. But he does see the potential for making electric motors more efficient, and this itself is no small feat.
 

Resume for Markus Kahn http://lees.mit.edu/lees/old_files/full/faculty/Zahn/Zahnbiography%208-05.pdf
Maybe the effect is not commonly known as you put it, but surely this guy would have spotted it?
And hes not exactly a n00b to magnetics.
http://lees.mit.edu/lees/old_files/full/projects/ferrof00.html

[magnetoelastic]

EMdevices sez:
>The MAGTROL  brakes are not HYSTERISIS activated. I'm surprised they claim that.   
>
>Hysterisis comes about by cycling the operating point of a ferromagntic material back and forth along the H->B  curve.   This requires AC, and these brakes use DC (just follow the flux path, they even say it's dc, the >small poles all have the same polarity, so it's not like an alternator rotor with alternating N S poles).

It is indeed a hysteresis brake.  Hysteresis works at DC, too, unlike an eddy current brake.  A hysteresis brake can exhibit full torque at zero RPM.

[sterlinga]

Here's our coverage: http://peswiki.com/index.php/Directory:Perepiteia_Generator_by_Potential_Difference_Inc

[Schpankme]

This is really a great story, told repeatedly over the last 20 plus years.

"Neo magnet runs the risk that increased flux can drive the housing and armature laminations into saturation, increasing iron losses and limiting the potential gain in efficiency. To work around this problem, the relative radial thicknesses of the magnet and the steel housing should be adjusted for maximum air-gap flux density. The lamination spoke width should increase and the inner lamination spokes should be converted to a solid rotor hub. Maximum efficiency can easily rise another 5 to 10% by optimizing the magnet, housing, and armature lamination dimensions"

The higher the remanence (B_R) of a magnet, the better it can reduce current draw in a dc motor. The product of a magnet's operating flux density (B) and its magnetizing force (H) is a direct measure of its energy density. The maximum, (BH)_max, is commonly used as a figure of merit for a permanent-magnet material.

Remanence is the magnetization left behind in a medium after an external magnetic field is removed. It is denoted in equations as M_R. In engineering applications it is often assumed that the magnetization M is synonymous with the flux density B, hence the remanence is denoted as B_R.

The remanence magnitude can be taken from a hysteresis loop at the intersections of the loop with the vertical magnetization axis.

- Schpankme

[EMdevices]

thanks magnetoelastic,Ã,  I think you might have set me straight.Ã,  I read a bit more, and sure enough they have eddy current brakes which are separate from the hysterisis type, which work independent of RPM.Ã,  Ã,  I guess I learned something new today.

EM