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What is a flywheel energy storage system?

Flywheel energy storage systems (FESSs) store mechanical energy in a rotating flywheel that convert into electrical energy by means of an electrical machine and vice versa the electrical machine which drives the flywheel transforms the electrical energy into mechanical energy. Fig. 1 shows a diagram for the components that form a modern FESS.

What are the characteristics of different flywheel materials?

Characteristics for different flywheel materials . In order to obtain high specific energy, flywheel materials must be light, with low ρ, and have high tensile strength allowing high spinning speeds, such as modern composite materials. Metals are heavy and do not allow reaching high spinning speeds.

What determines the maximum spinning speed of a flywheel?

Flywheel material The maximum spinning speed ω is determined by the capacity of the material to withstand the centrifugal forces affecting the flywheel, that is, the material tensile strength . Centrifugal forces are proportional to the mass, the radius and the squared spinning speed.

How much does a flywheel weigh?

In a flywheel made of steel ( ρ =7800 kg/m3 ) and disk-shaped ( ri =0), the required radius to obtain I =338 kg m 2 corresponds to ro =0.620 m. These calculations have been done for a proportion between disk thickness and radius of 0.3 so that the planar stress condition is maintained . The resulting weight of the flywheel is 1.76 Tm.