FLYWHEEL AS A ENERGY
Enroll. No.- 383/10
DEPARTMENT OF ELECTRICAL
Flywheel energy storage (FES) works by
accelerating a rotor (flywheel)to a very high
speed and maintaining the energy in the
system as rotational energy.
During extraction, principle of conservation
of energy is being followed.
It is designed in which the flywheel device
saves and release energy when necessary.
• FES stores energy by constantly spinning a
compact rotor in a low-friction environment.
• Rotors made of high strength carbon fiber
filaments, and spinning at speeds from 20,000 to
over 50,000 rpm.
• Magnetic bearings are sometimes used instead of
• The efficiency in the chamber is enhanced by the
creation of a rough vacuum.
In 2013 Volvo announced a flywheel system
fitted to the rear axle of its S60 sedan.
Uninterrupted power supplies.
Grid energy storage
Beacon Power opened a 20 MW, (5 MWh
over 15 min) flywheel energy storage
plant in Stephentown, New York in 2011.
Merits of FES unit
Highly efficient, Non-polluting.
Reliable, Long life.
Easily and inexpensively maintained, and safe.
Much higher charging and discharging rate.
Able to cyclic discharged to zero energy
The storage capacity is independent of temperature
Much higher energy storage efficiencies.
High power output.
Demerits of FES unit
• Current flywheels have low specific energy. There
are safety concerns associated with flywheels due
to their high speed rotor and the possibility of it
breaking loose & releasing all of it's energy in an
• Flywheels are a less mature technology than
chemical batteries, and the current cost is too
high to make them competitive in the market.