Notes

Write a note in this area. It'For ages flywheels have used to achieve smooth operation of machines. The early models consisting of
only a stone wheel attached to an axel. Nowadays flywheels are more complex constructions where
energy is stored mechanically and transferred to and from the flywheel by an integrated motor/generator.
The stone wheel has been replaced by a steel or composite rotor and magnetic bearings have been
introduced.
A flywheel stores energy in a rotating mass. Depending on the inertia and the speed of the rotating mass,
a given amount of kinetic energy is stored as the form of rotational energy. One of the uses of the
flywheel is inside a vacuum containment to eliminate friction-loss from the air and suspended by bearings
for a stabile operation. Kinetic energy is transferred in and out of the flywheel with an electrical machine
that can function either as a motor or generator depending on the load angle (phase angle). When acting
as motor, electric energy supplied to the stator winding is converted to torque and applied to the rotor,
causing it to spin faster and gain kinetic energy. In generator mode kinetic energy stored in the rotor
applies a torque, which is converted to electric energy. Fig. 1 shows the basic layout of a flywheel energy
storage system. Apart from the flywheel, Additional power electronics is required to control the power
input and power output, speed, frequency and etc
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