On Mon, 3 Jul 2017 18:34:15 -0700 (PDT), Phil Allison
wrote:
Scott Dorsey wrote:
------------------------
** Many things about it scream scam - but ....
https://www.kickstarter.com/projects.../posts/1898322
Only 12W consumption so it must use permanent magnets.
Yes. It uses permanent magnets whose field falls off with the 4th power
of the distance so the resistance increases dramatically with deflection.
Which is good, at least in terms of the spring side of the mass-spring system.
The problem with this implementation is that it doesn't have enough mass, so
once you set it moving it bounces back and forth pretty severely at the
system's resonant frequency.
** Adding mas to the platter would only make the bouncing worse.
The problem is lack of damping.
How the heck do you damp something that floats ?
There is plenty of magnetic field there. All you need is some copper
or aluminium to generate eddy currents.
d
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