A flywheel is a heavy rotating disk used as a storage device for angular momentum, which is a form of kinetic energy. They come as an alternative energy storage device. Flywheels resist changes in their rotational speed, which helps steady the rotation of the shaft when an uneven torque is exerted on it by its power source such as a piston-based, (reciprocating) engine, or when the load placed on it is intermittent (such as a piston-based pump). Flywheels can also be used by small motors to store up energy over a long period of time and then release it over a shorter period of time, temporarily magnifying its power output for that brief period. Recently, flywheels have become the subject of extensive research as power storage devices; see flywheel energy storage.
A momentum wheel is a type of flywheel useful in satellite pointing operations, in which the flywheels are used to point the satellite's instruments in the correct directions without the use of thrusters.
The kinetic energy stored in a rotating flywheel is
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Funding Press Release - Announces addition of World Flywheel Consortium, Inc. (WFC) to its portfolio demonstration unit with 0.5 kWh of energy and 40 kW of power. Contact info.
ASPES Engineering AG - Graphic comparisons of power, rotor speed, and energy. Bibliography includes English and German titles.
Meta Description: [ ASPES Engineering AG, Switzerland: The page devoted to flywheels and other high speed rotors, ASPES Engineering AG, Switzerland: The page devoted to flywheels and other high speed rotors ]
Beacon Power - Makes 2 and 6 kilowatt-hour flywheel (kinetic-electric) energy storage units.
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Composite Flywheel Design - Project Update - Reviews work done by the Genetic Algorithms Research and Application Group (the GARAGe) on the design of composite material flywheels
EV World: Flywheels Offer New Spin on Energy Storage - Flywheels Offer New Spin on Energy Storage - Columnist writes that electric storage will be affordable. Column has links to 4 companies. (June 29,2002)
Meta Description: [ Flywheel energy storage units like this Beaconpower 250kW model offers far greater reliability than chemical batteries, but cost significantly more at the moment. ]
FAQ: Kinetic Energy Storage - ASPES Engineering AG site with technical information and theory on flywheels and design. Photos of failures.
Meta Description: [ ASPES Engineering AG, FAQ kinetic energy storage, ASPES Engineering AG, FAQ kinetic energy storage ]
Flywheel energy storage - Wikipedia - article includes equation for kinetic energy
Flywheel Energy Systems, Inc. - Private corporation to bring flywheel technology to the marketplace Rotors, testing, and systems.
Meta Description: [ Flywheel Energy Systems Inc.
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Flywheel Systems - Technical article and information on flywheels for energy storage and to improve power quality. Links to a maker.
Flywheel Theory - Basics of flywheel energy storage, with links to many other sites.
Flywheels - Technical paper and information on exotic bearings for flywheels.
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Flywheels - Voltage Ride-Through Technology. Index page to 31 slides. Link to pdf version at bottom.
Flywheels channel at Power Design 365 - articles, product information and vendors
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Hybrid Electric Vehicle Program - HEV Flywheel Safety - Safety concerns associated with flywheel technology.
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Kinetic Power Cell Technology vs. Battery UPS - compares Caterpillar flywheel unit to battery UPS. 15s x 300kVA. 14 sq ft.
Liebert FS Advanced Flywheel Energy Storage System - Emerson Network Power announcement of new product.
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Motor Generator - Brushless DC Motor - on motor types for high speed flywheel energy storage.
Meta Description: [ Thoughts on motor types for high speed flywheel energy storage. ]
Pentadyne Selected as ``Most Promising Company'' - at Energy Venture Fair V. Flywheel maker lauded.
Meta Description: [ CHATSWORTH, Calif.--(BUSINESS WIRE)--Nov. 22, 2004--Pentadyne Power Corporation, a manufacturer of advanced flywheel power systems, was recently named the most ]
PO: Aerospace Flywheel Development - wants 5x specific energy (Whr/lb), and 2x life, for spacecraft. Applications, accomplishments, events, development, details, business opportunities, images, papers/presentations, and resources/links.
PO: Highlights and Accomplishments - NASA Glenn Research Center, Power Propulsion Office news. Page shows 3 items on flywheel development. Pictures and contacts.
Regenerative Power and Motion: A Low-Loss Flywheel Battery - technology and applications of stationary model.
Meta Description: [ Describes technology and applications of stationary on-site flywheel battery with zero idling losses developed by RPM. ]
Tribology Systems, Inc. - Solid-lubricated bearing technology. Operational speeds can range up to 500,000 RPM, with temperatures up to 1000 F. Links to flywheel battery information.
Meta Description: [ Tribology Systems, Inc. is a recognized leader in solid-lubricated bearing technology. Their unique bearing design significantly reduces lubricant stress, allowing complete freedom of ball or roller motions in the bearing for long maintenance-free life. Operational speeds can range up to 500,000 ... ]
Urenco Power Technologies - Kinetic Energy Storage - Information about kinetic energy storage systems for transportation applications.
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