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On the Efficiency of a Two-Power-Level Flywheel-Based All-Electric Driveline

Author

Listed:
  • Johan Abrahamsson

    (Division for Electricity, Department of Engineering Sciences, Uppsala University, Uppsala 75105, Sweden)

  • Janaína Gonçalves De Oliveira

    (Division for Electricity, Department of Engineering Sciences, Uppsala University, Uppsala 75105, Sweden)

  • Juan De Santiago

    (Division for Electricity, Department of Engineering Sciences, Uppsala University, Uppsala 75105, Sweden)

  • Johan Lundin

    (Division for Electricity, Department of Engineering Sciences, Uppsala University, Uppsala 75105, Sweden)

  • Hans Bernhoff

    (Division for Electricity, Department of Engineering Sciences, Uppsala University, Uppsala 75105, Sweden)

Abstract

This paper presents experimental results on an innovative electric driveline employing a kinetic energy storage device as energy buffer. A conceptual division of losses in the system was created, separating the complete system into three parts according to their function. This conceptualization of the system yielded a meaningful definition of the concept of efficiency. Additionally, a thorough theoretical framework for the prediction of losses associated with energy storage and transfer in the system was developed. A large number of spin-down tests at varying pressure levels were performed. A separation of the measured data into the different physical processes responsible for power loss was achieved from the corresponding dependence on rotational velocity. This comparison yielded an estimate of the perpendicular resistivity of the stranded copper conductor of 2.5 × 10 −8 ± 3.5 × 10 −9 . Further, power and energy were measured system-wide during operation, and an analysis of the losses was performed. The analytical solution was able to reproduce the measured distribution of losses in the system to an accuracy of 4.7% (95% CI). It was found that the losses attributed to the function of kinetic energy storage in the system amounted to between 45% and 65%, depending on usage.

Suggested Citation

  • Johan Abrahamsson & Janaína Gonçalves De Oliveira & Juan De Santiago & Johan Lundin & Hans Bernhoff, 2012. "On the Efficiency of a Two-Power-Level Flywheel-Based All-Electric Driveline," Energies, MDPI, vol. 5(8), pages 1-24, August.
    • Handle: RePEc:gam:jeners:v:5:y:2012:i:8:p:2794-2817:d:19186
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    References listed on IDEAS

    as
    1. Bolund, Björn & Bernhoff, Hans & Leijon, Mats, 2007. "Flywheel energy and power storage systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 11(2), pages 235-258, February.
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    Cited by:

    1. Magnus Hedlund & Tobias Kamf & Juan De Santiago & Johan Abrahamsson & Hans Bernhoff, 2017. "Reluctance Machine for a Hollow Cylinder Flywheel," Energies, MDPI, vol. 10(3), pages 1-18, March.
    2. Magnus Hedlund & Johan Lundin & Juan De Santiago & Johan Abrahamsson & Hans Bernhoff, 2015. "Flywheel Energy Storage for Automotive Applications," Energies, MDPI, vol. 8(10), pages 1-28, September.

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