Flywheel energy storage (FES) utilizes a spinning rotor to store energy as rotational energy, offering high efficiency and reliability. Applications range from public transport to rail electrification and energy storage systems, though current flywheel technology faces challenges such as low specific energy and high costs. Despite safety concerns and being less mature compared to chemical batteries, FES provides advantages like high power output and long lifespan.

1. FLYWHEEL AS A ENERGY
STORAGE DEVICE
By:Avinash Sengar
Enroll. No.- 383/10
DEPARTMENT OF ELECTRICAL
ENGINEERING

2. INTRODUCTION
 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.

3. BASIC DIAGRAM

4. MAIN COMPONENTS
• 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
mechanical bearings.
• The efficiency in the chamber is enhanced by the
creation of a rough vacuum.

5. APPLICATIONS

6. Flywheel in battery powered
bus- FLYBUS

10. Other Applications
 In 2013 Volvo announced a flywheel system
fitted to the rear axle of its S60 sedan.
 Wind Turbines.
 Rail vehicles.
 Rail electrification.
 Uninterrupted power supplies.
 Pulse power.
 Amusement rides.
 Pulse power

11. Grid energy storage
Beacon Power opened a 20 MW, (5 MWh
over 15 min) flywheel energy storage
plant in Stephentown, New York in 2011.

12. Merits of FES unit

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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
without degrading
 The storage capacity is independent of temperature
fluctuations.
 Much higher energy storage efficiencies.
 High power output.

13. 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
uncontrolled manner.
• Flywheels are a less mature technology than
chemical batteries, and the current cost is too
high to make them competitive in the market.

14. References
http://en.wikipedia.org/wiki/Flywheel_energ
y_storage
http://www.beaconpower.com/products/ab
out-flywheels.asp
http://news.nationalgeographic.com/news/
energy/2011/2/110223-electric-gridflywheels-compressed-air/