Energy Storage for Fuel Cell & Hybrid Electric Buses: Flywheel Project

The objective of this project is to design and develop a compact, lightweight and reliable energy storage for hybrid electric and fuel cell transit buses. This effort is designed to improve the flywheel motor generator's (FMG) robustness and ruggedness, as a first step in the transition of this promising power management technology from stationary to mobile/transportation applications. WestStart will partner with AFS Trinity Power Corporation to execute the design and engineering work under this program. AFS Trinity is in the business of developing and manufacturing Flywheel Power Systems for power management applications. That is, applications where the characteristic ride through time is in the range of a few to several tens of seconds. The power output of the system is high, while the energy storage is modest. These systems are in contrast to lead-acid batteries where the characteristic discharge time is several minutes or more, and where for short discharge only a very small fraction of the total available stored energy is available. The M3AM Flywheel Power System (presently in the pre-production stage of development) delivers 0.42 kWh over 15 seconds, at a power of 100kW, with active magnetic bearings. The goal of the proposed work is to implement and demonstrate design features of the FMG to improve robustness and ruggedness. Under this contract, test articles will be designed, fabricated and tested. Work will start with the M3 class rotor under FY 2002 funding to advance the state of the art in the areas of dynamic variations in system response, touchdown bearing performance, and low loss systems.

  • Supplemental Notes:
    • This is a Congressionally Directed Project.


  • English


  • Status: Active
  • Funding: $980000.00
  • Contract Numbers:


  • Sponsor Organizations:

    Federal Transit Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Hsiung, Shang

  • Performing Organizations:


    2181 East Foothill Boulevard
    Pasadena, CA  United States  91107
  • Principal Investigators:

    Boesel, Joe

  • Start Date: 20020800
  • Expected Completion Date: 0
  • Actual Completion Date: 20031200
  • Source Data: RiP Project 8728

Subject/Index Terms

Filing Info

  • Accession Number: 01459023
  • Record Type: Research project
  • Source Agency: Federal Transit Administration
  • Contract Numbers: FTA-CA-26-7033
  • Files: RIP, USDOT
  • Created Date: Jan 3 2013 12:55PM