Design and Testing of a Flywheel Battery for a Transit Bus

Hayes, Richard; Kajs, J.P.; Thompson, Richard C.; Beno, J.H.

doi:10.4271/1999-01-1159

Cited by 42 publications

(19 citation statements)

References 2 publications

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“…Tensile strengths in Eq. (2) are calculated from the products of V fr and fiber strength (S f ) along with a safety factor of 0.75.…”

Section: Failure Criteriamentioning

confidence: 99%

“…Compared with a chemical battery such as a lithium ion battery, flywheels present various benefits such as light weight, high power density, long life, and low environmental impact. Consequently, research and development of flywheels as batteries has continued for applications not only in fields related to electrical power, but also in satellites and vehicles [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Optimization of flywheel rotor made of three-dimensional composites

Hiroshima

Hatta

Koyama

et al. 2015

Composite Structures

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“…Tensile strengths in Eq. (2) are calculated from the products of V fr and fiber strength (S f ) along with a safety factor of 0.75.…”

Section: Failure Criteriamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimization of flywheel rotor made of three-dimensional composites

Hiroshima

Hatta

Koyama

et al. 2015

Composite Structures

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“…In the 1990s, at the University of Austin, Texas, a bus was equipped with a modern flywheel. This flywheel could store 2 kWh and was rated for 150 kW of continuous power [41,42]. They reported a flywheel for pulsed loads in a military vehicle in 2001 [43].…”

Section: Busesmentioning

confidence: 99%

Flywheel Energy Storage for Automotive Applications

et al. 2015

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A review of flywheel energy storage technology was made, with a special focus on the progress in automotive applications. We found that there are at least 26 university research groups and 27 companies contributing to flywheel technology development. Flywheels are seen to excel in high-power applications, placing them closer in functionality to supercapacitors than to batteries. Examples of flywheels optimized for vehicular applications were found with a specific power of 5.5 kW/kg and a specific energy of 3.5 Wh/kg. Another flywheel system had 3.15 kW/kg and 6.4 Wh/kg, which can be compared to a state-of-the-art supercapacitor vehicular system with 1.7 kW/kg and 2.3 Wh/kg, respectively. Flywheel energy storage is reaching maturity, with 500 flywheel power buffer systems being deployed for London buses (resulting in fuel savings of over 20%), 400 flywheels in operation for grid frequency regulation and many hundreds more installed for uninterruptible power supply (UPS) applications. The industry estimates the mass-production cost of a specific consumer-car flywheel system to be 2000 USD. For regular cars, this system has been shown to save 35% fuel in the U.S. Federal Test Procedure (FTP) drive cycle.

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“…Flywheel-power assisted cars (2), (3) (mostly mechanical, or with mechanical bearings) have been developed since long time ago and in ongoing researchs in effort to make flywheel systems smaller, lighter, cheaper and have greater capacity. Proposed flywheel systems would eliminate the disadvantages of existing battery systems such as low power density, long charge times, heavy weight, short lifetimes, and lead pollution (4) .…”

Section: Journal Of System Design and Dynamicsmentioning

confidence: 99%

A Study on AMB Flywheel Powered Electric Vehicle

Rachmanto

Nonami

Kuriyama

et al. 2009

JSDD

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This paper describes a novel concept and configuration of Electric Vehicle powered by flywheel with Active Magnetic Bearing suspended by gimbal mechanism to the vehicle body. The entire system consists of AMB Flywheel Energy Storage including energy charger/discharger module, mechanical 2-DOF gimbal, steer-by-wire module, and autonomous driving module as the supervising controller. This paper shows the results of outdoor field experiments such as the feasibility test of steer-by-wire system, the implementation of input shaping to reduce vibration and gyroscopic effects, simple adaptive control method for flywheel attitude control, and the efficiency measurement of the energy conversion system.

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Design and Testing of a Flywheel Battery for a Transit Bus

Cited by 42 publications

References 2 publications

Optimization of flywheel rotor made of three-dimensional composites

Optimization of flywheel rotor made of three-dimensional composites

Flywheel Energy Storage for Automotive Applications

A Study on AMB Flywheel Powered Electric Vehicle

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