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 Flywheel Energy Storage System (FESS)
Post: #1

need any seminars given on this topic.
Post: #2
haiii sir i want know more abt flywheel battery for doing my seminars.
Post: #3
Flywheel Energy Storage
The kinetic energy stored in a solid disk or cylinder shaped flywheel is proportional to its speed and diameter according to equation (1)
Ek = Ã‚Â½ Iw2 (1)
where Ek is the kinetic energy, I is the moment of inertia around its center of mass, and w is the angular velocity, and equation (2)

I = Ã‚Â½ r2m (2)

where r is the radius of the flywheel and m is the mass.1

Upon examination of the above equations it is obvious that two situations are possible: Build a colossal flywheel that spins slow enough to not throw itself apart or build a small Herculean flywheel that can be spun extremely fast. It is easy and rather amusing to envision large wheels attached to buildings being spun by wind and water with birds changing their pirch as the slow megalithic wooden wheelsâ„¢ spokes fall in and out of parallel or even larger wheels rolling down inclined tracks attached to movable motors only to be drug back up the incline by sturdy bulls. What is harder to envision are flywheels no bigger than a coin or compact disc contained in near 100% vacuum chambers being spun at thousands or revolutions per minute on magnetic bearings. While several problems are associated with either option, the latter shall be examined.

The easiest method of increasing the kinetic energy in the flywheel is to increase the angular velocity. Due to the increase of radial and hoop stresses (depending on design) associated with increasing angular velocity lighter stronger monofilament materials are desired. Currently several flywheel materials are used, none of which have a tensile strength greater than 2 GPa2. However a special type of glass, that is 50 times stronger posses an even larger tensile strength and lends itself as a flywheel material.

http://www.gmic.org/News/Amoroso-Flywhee...torage.doc
http://www.osti.gov/bridge/servlets/purl/918509-Cud1it/
Post: #4
[attachment=3845]
FLY WHEEL ENERGY STORAGE

SUBMITTED BY

BASIC FUNDAMENTAL

The rotational energy or angular kinetic energy is the kinetic energy due to the rotation of an object and is part of its total kinetic energy. Looking at rotational energy separately in an object's centre of mass frame, one gets the following dependence on the object's moment of inertia:
Kinetic Energy = 1/2*Iw2
I Is the moment of inertia.
Ãâ€° is the angular speed

HISTORY OF FLY WHEEL ENERGY STORAGE

FLY WHEEL IS BASICALLY COME FROM POTTERâ„¢S WHEEL.POTTERYâ„¢S WHEEL IS USED FROM MANY YEAR.

heavy wheel attached to a rotating shaft so as to smooth out delivery of power from a motor to a machine. The inertia of the flywheel opposes and moderates fluctuations in the speed of the engine and stores the excess energy for intermittent use.
FLY WHEEL USED BUS IN 1940 IN Yverdon-les-Bains (Switzerland)

HYBRID VEHICLE
LATEST TECNOLOGY

MAIN COMPONENT

ROTOR
MAGNETIC BEARINGS
VACUUM CHAMBER
MOTOR WINDING
WORKING
ROTOR ROTOR ROTATE AT 20000 TO 50000rpm
CARBON FIBER
MAGNETIC BEARINGS
APLLICATION

Transportation
Uninterruptible power supply
Laboratories
Pulse power
Motor sports
Frequency regulation

TRANSPORTATION

U.P.S.FOR GRID
MOTOR SPORTS
read http://www.seminarprojects.org/t-flywheel-batteries for some related good topic Flywheel Batteries
Post: #5

pls send more details for fess...........
Post: #6
Presented by
MANOHAR KALAHAL

[attachment=11774]
Flywheel energy storage system
Working principle

 Electric energy produced by solar ,wind, and hydro is directly connected to flywheel.
 Flywheels are rotating wheels used to store kinetic energy.
 It works by accelerating a rotor to a very high speed and maintaining the energy in the system as inertial energy.
 The flywheel then delivers rotational energy to power an electric generator.
 The sum of the kinetic energy of the individual mass elements that comprise the flywheel equals the energy stored.
 The kinetic energy of a flywheel is given by
Ek is the kinetic energy
ω is the velocity of disc
The moment of inertia is defined as
 Where M is the mass,
 k is the inertial constant
Why Flywheel Storage???
Commonly using energy storage system is electrochemical batteries such as
 nickel hydrogen
Electrochemical batteries having lot of disadvantages such as
 Low efficiency
 Heavy weight
 Environmental hazards
FLYWHEEL ENERGY STORAGE (FES)
Compare to that of electro-chemical batteries these FES are very useful and advantageous one
FES having
 High efficiency
 High depth of discharge
 Long life
 Almost three times that of batteries
 Quick charging
COMPONENTS OF FLYWHEEL SYSTEM
 Rotor:
- First generation flywheel energy storage systems use a large steel flywheel rotating on mechanical bearings.
-Newer systems use carbon fiber composite rotors that have a higher tensile strength than steel but are an order of magnitude less heavy.
 Bearings:
The upper bearing of the unit is a combination magnetic bearing, providing suspension axially as well as radically.
The lower magnetic bearing suspends the shaft in the radial direction only.
At each end of the shaft there is also a touchdown bearing. This provides a back up bearing system should the magnetic bearings fail during testing.
` Magnetic bearings are sometimes used instead of mechanical bearings, to reduce friction.
Motor/generator
 The motor/generator unit is located at the lower end of the shaft.
 It consists of a two-pole rotor piece with surface mounted samarium cobalt magnets and a carbon fiber retaining wrap.
 On the stator side, there are three phase sinusoidally distributed windings in twelve slots.
 A water jacket around the stator provides cooling.
FLYWHEEL CONTROL
There are three modes of operation for the flywheel in a spacecraft power system
 1) Charge
 2) Charge reduction
 3) Discharge
Charge
In charge mode, the solar array produces enough current to charge the flywheel at its set point and to provide the required load current. The solar array electronics regulate the DC bus voltage during charge mode
Charge reduction
In charge reduction mode, the solar array continues to provide load current but it cannot provide enough current to charge the flywheel at its set point. When this occurs, the DC bus voltage regulation function is transferred to the flywheel system.
Discharge
In discharge mode, the flywheel system provides the entire load current and regulates the DC bus voltage.
HOW CONTROL SYSTEM WORKS
AEROSPACE FLYWHEEL CHALLANGES

 Short-term energy storage .
 Any mechanical bearing with contact between the stationary and rotating parts will have enough loss to render the system uneconomical one .
 solution to the problem is to use a non-contact active magnetic bearing that employs conventional electromagnets.
 A reasonable magnetic bearing consumes a few watts for each kilogram of flywheel weight.
 Superconducting magnetic bearings, have losses of 10-2 to 10-3 watts per kg for a 2,000 rpm rotor.
 Flywheel its self consumes the energy and dissipated as heat.
 Flywheels are not affected by temperature changes.
 Quick charging with in 15 min.
 High efficiency.
 High depth of discharge.
 Long life.
 simple measurement of the rotation speed is possible to know the exact amount of energy stored.
 No limit of energy storage
 Flywheels are also less potentially damaging to the environment.
 short term energy storage.
 Flywheel energy storage systems using mechanical bearings can lose 20% to 50% of their energy in 2 hours.
 They have complex designs.
 “Flywheel explosion” takes place when tensile strength of a flywheel is exceeded
APPLICATIONS
 Energy storage - replacement for batteries for spacecraft in low earth orbit.
 Power peaking for aircraft/spacecraft secondary power.
 In the 1950s flywheel-powered buses, known as gyro buses, were used in, Switzerland.
 It is hoped that flywheel systems can replace conventional chemical batteries for mobile applications, such as for electric vehicles.
CONCLUSION
This paper concludes that
The batteries that are used in the space craft, have a very limited life span (of the order of 36 months only). Hence the flywheel system is to replace batteries on future spacecraft.
As the flywheel system is a life long technology.
Post: #7
to get information about the topic Fly wheel energy storage system full report ,ppt and related topic refer the link bellow

http://www.seminarprojects.org/t-flywhee...ystem-fess

http://www.seminarprojects.org/t-flywhee...ess?page=2

http://www.seminarprojects.org/t-flywhee...age--13758

http://www.seminarprojects.org/t-flywhee...gy-storage
Post: #8
Flywheel Energy Storage System (FESS)

INTRODUCTION
Flywheel energy storage systems store kinetic energy (i.e. energy produced by motion) by constantly spinning a compact rotor in a low-friction environment. When short-term back-up power is required (i.e. when utility power fluctuates or is lost), the rotor's inertia allows it to continue spinning and the resulting kinetic energy is converted to electricity.
Active Power's CleanSource® Flywheel Technology, as shown below, integrates the function of a motor, flywheel rotor and generator into a single integrated system. The motor, which uses electric current from the utility grid to provide energy to rotate the flywheel, spins constantly to maintain a ready source of kinetic energy. The generator then converts the kinetic energy of the flywheel into electricity. This integration of functionality reduces the cost and increases product efficiency.

Flywheels store energy very efficiently (high turn-around efficiency) and have the potential for very high specific power compared with batteries. Flywheels have very high output potential and relatively long life. Flywheels are relatively unaffected by ambient temperature extremes.

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 and 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.
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