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What is a flywheel?

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Flywheel plates and drums

Flywheel plates and drums

© Cummins
Definition:

A flywheel is a heavy shaft-mounted rotating disc that absorbs and stores twisting or spinning motion and then releases it as rotational kinetic energy to provide motion to a stationary, or nearly stationary object.

Flybrids (a variation of regular electromechanical hybrids) use a flywheel instead of a battery to store regenerative braking energy. This stored energy is used to initially propel (or assist the vehicle’s internal combustion engine) for powering and maintaining motion of the vehicle.

Also Known As: flywheel storage device

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