This energy is used to set the flywheel in motion. The flywheel is often located in a vacuum environment and mounted on magnetic. . Flywheel energy storage (FES) works by spinning a rotor (flywheel) and maintaining the energy in the system as rotational energy. When energy is extracted from the system, the flywheel's rotational speed is reduced as a consequence of the principle of conservation of energy; adding energy to the. . S technology originates from aerospace technology. The fundamental principle behind an FES system is rooted in basic physics – specifically, the concept of rotational energy.
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