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30-01-2009, 04:06 PM

A recent innovation in electrical energy storage is the use of flywheel energy storage, also called flywheel power storage. A typical system consists of a massive flywheel disc suspended by magnetic bearings inside a vacuum chamber to reduce friction, connected to a combination electric motor/electric generator. The wheels are generally made of high-tensile-strength fibers (such as carbon fibers) embedded in epoxy resins, or some other high-strength composite material. The system stores power by driving the motor to increase the speed of the spinning flywheel. The system provides power by using the momentum of the flywheel to power the generator
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24-09-2010, 11:37 AM

To know more about FLYWHEEL ENERGY STORAGE please follw the link:

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13-06-2011, 07:43 PM

need full report and slides
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15-02-2012, 12:32 PM

to get information about the topic Fly wheel energy storage system full report ,ppt and related topic refer the link bellow
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23-06-2012, 11:29 AM


.doc   Flywheel.doc (Size: 8.11 MB / Downloads: 40)


A flywheel is an inertial energy-storage device. It absorbs mechanical
energy and serves as a reservoir, storing energy during the period when the supply of energy is more than the requirement and releases it during the period when the requirement of energy is more than the supply.

Flywheels-Function need and Operation

The main function of a fly wheel is to smoothen out variations in the
speed of a shaft caused by torque fluctuations. If the source of the
driving torque or load torque is fluctuating in nature, then a flywheel is
usually called for. Many machines have load patterns that cause the
torque time function to vary over the cycle.

Internal combustion

engines with one or two cylinders are a typical example. Piston compressors, punch presses, rock crushers etc. are the other systems
that have fly wheel.
Flywheel absorbs mechanical energy by increasing its angular velocity and delivers the stored energy by decreasing its velocity.

Design Approach

There are two stages to the design of a flywheel . First, the amount of energy required for the desired degree of smoothening must be found and the (mass) moment of inertia needed to absorb that energy determined.
Then flywheel geometry must be defined that cater the required moment of inertia in a reasonably sized package and is safe against failure at the designed speeds of operation.

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24-06-2012, 02:09 PM

Is this an electrical seminar and presentation topic under ieee?[/i]
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25-06-2012, 11:21 AM

to get information about the topic Fly wheel energy storage system full report ,ppt and related topic refer the link bellow
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08-05-2013, 02:47 PM

Flywheel Energy Storage

.pdf   Flywheel Energy.pdf (Size: 1.1 MB / Downloads: 21)

Executive Summary

Flywheels have been around for thousands of years. The earliest application is likely the potter’s wheel. Perhaps the most common application in more recent times has been in internal combustion engines. A flywheel is a simple form of mechanical (kinetic) energy storage. Energy is stored by causing a disk or rotor to spin on its axis. Stored energy is proportional to the flywheel’s mass and the square of its rotational speed. Advances in power electronics, magnetic bearings, and flywheel materials coupled with innovative integration of components have resulted in direct current (DC) flywheel cantly increasing battery life. A flywheel could also be used alone for applications where longer-term backup capability is not required or economically justified. Variations In general, flywheels can be classified as low speed or high speed. The former operate at revolutions per minute (rpm) measured in thousands, while the latter operate at rpm measured in the tens of thousands. As noted above, doubling the rpm quadruples the stored energy, all else equal, so increasing rpm significantly increases the energy density of a flywheel. Operating at higher rpm necessitates fundamental differences in design approach. While low-speed flywheels are usually made from steel, high-speed flywheels are typically made from carbon or carbon and fiberglass composite materials that will withstand the higher stresses associated with higher rpm. Higher rpm also creates greater concern with friction losses from bearings and air drag. High-speed flywheels universally employ magnetic bear-ings and vacuum enclosures to reduce or eliminate the two sources of friction. Magnetic bearings allow the flywheel to levitate, essentially eliminating frictional losses associated with conventional bearings. While some low-speed flywheels use only conventional mechanical bearings, most flywheels use a combination of the two bearing types.

Where to Apply

DC flywheel energy storage systems are
generally more reliable than batteries,
so applicability is mostly an issue of
cost-effectiveness. Batteries will usually
have a lower first cost than flywheels,
but suffer from a significantly shorter
equipment life and higher annual operation
and maintenance expenses.

What to Avoid

UPS batteries are sized to provide
backup power for periods measured
in minutes. The period ranges from
about 5 minutes up to around 1 hour,
but is commonly about 15 minutes. A
period of 15 minutes, more or less, is
generally presumed adequate to allow
an orderly shutdown of equipment


Flywheels appear poised to replace or
supplement batteries as a backup power
supply in UPS systems. Six companies
currently offer DC flywheel energy
storage products. Another half dozen
or so are developing products they
expect to bring to market within the
next few years. Still others offer products
where the flywheel is an integral
part of the UPS system rather than
being a direct substitute for batteries.

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