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Check out activepower. They've been in the flywheel biz for awhile for data center power.

But they've been struggling for a viable business last 10yrs.

Area required and noise are big issues.



Dumb question: couldn’t a vacuum chamber and magnetic bearings overcome those issues?


Active Power's UPS systems do use magnetic bearings:

  Immediately after the output is transferred from bypass to
  the power stage, the flywheel field is excited which also
  provides magnetic lift to unload the flywheel bearings.
Source: http://www.activepower.com/en-US/documents/3801/wp108-operat...




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