How is the energy stored in a flywheel?
It is stored by means of a rotating mass; hence the energy stored in a flywheel is derived by the following formula: k – Depends on the shape of the rotating mass M – Mass of the flywheel ω – Angular velocity A first consideration can be made by observing that the energy is proportional to the square of the angular velocity. This is the reason why the technology trend line is to have a flywheel where energy is stored by having higher speed (RPM) values. This allows for lower weight, smaller footprint and allows for using full magnetic levitation of the flywheel mass.
