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Variable permanent magnet 2

centrifugally compressed magnetic medium
 
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The magnets are set in a block of stiff rubber. There is rubber between each magnet. I imagine the magnets have to be placed or forced in the right orientation.

As the motor or generator starts the centrifugal force doesn't effect the rubber and the magnets have initial field lines. As the motor or generator winds up to greater speeds, the rubber compresses and the magnets become closer together and the field lines change giving a greater magnetic field density.

Bollocks or sense?

wjt, May 15 2015

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       I guess you could use a centrifuge and rubber to adjust the relative position of magnets. There are quite a few easier ways to do this such as screw, gears, etc.   

       I guess if you're sensing or controlling the speed of an engine or something, maybe there would be some use for this.
scad mientist, May 15 2015
  

       Obviously not even a speck of silver in the lining.
wjt, May 19 2015
  

       Once the rubber is compressed, won't the magnets keep it that way, unless it's so stiff there's hardly any compression from reasonable forces?
notexactly, May 31 2015
  

       I was thinking about huge motor/generators that have to overcome a large startup resistance. The loss of gap for these machines, because they would be run to end of life, is not a problem.   

       [notexactly] There would be a balance point there, but maybe, a pneumatic/hydraulic port is needed to help expand the rubber on shutdown.
wjt, May 31 2015
  
      
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