The technology uses the inertia of a spinning wheel. Electrical energy is transformed into kinetic energy related to the rotation of the wheel : E = Kmr2ω2,
where   K is a constant,
            m is the weight of the wheel,
            r is the radius of the wheel,
            ω is the angular velocity.



Then SEVIL's technology allows to maintain the energy stored up on a very long duration, and later return it as electricity.

The end user doesn't have to think about it : the storage unit is just another electrical device, simply assuming its mission : to store up and return electricity.

Typical flywheel cycle :


  » charging : the motor inside the flywheel is fed electrically and transforms this energy into motion, accelerating the wheel,
  grid

motor / generator

flywheel


»
freewheel phase : the unit is not electrically fed anymore; the wheel keeps spinning frictionless and the energy stored up is conserved,
  grid

motor/generator

flywheel


»
discharging : the flywheel decelerates, and the generator now transforms motion into electricity.
  grid

motor/generator

flywheel



The cycle is reversible, and the unit can be charged and discharged totally or partially, in a period of time that can be set.


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Electricity storage by levitated flywheels