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Reluctance Machine for a Hollow Cylinder Flywheel

Author

Listed:
  • Magnus Hedlund

    (Division for Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden)

  • Tobias Kamf

    (Division for Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden)

  • Juan De Santiago

    (Division for Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden)

  • Johan Abrahamsson

    (Division for Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden)

  • Hans Bernhoff

    (Division for Electricity, Uppsala University, Lägerhyddsvägen 1, 75237 Uppsala, Sweden)

Abstract

A hollow cylinder flywheel rotor with a novel outer rotor switched reluctance machine (SRM) mounted on the interior rim is presented, with measurements, numerical analysis and analytical models. Practical experiences from the construction process are also discussed. The flywheel rotor does not have a shaft and spokes and is predicted to store 181 Wh / kg at ultimate tensile strength (UTS) according to simulations. The novel SRM is an axial flux machine, chosen due to its robustness and tolerance for high strain. The computed maximum tip speed of the motor at UTS is 1050 m / s . A small-scale proof-of-concept electric machine prototype has been constructed, and the machine inductance has been estimated from measurements of voltage and current and compared against results from analytical models and finite element analysis (FEA). The prototype measurements were used to simulate operation during maximal speed for a comparison towards other high-speed electric machines, in terms of tip speed and power. The mechanical design of the flywheel was performed with an analytical formulation assuming planar stress in concentric shells of orthotropic (unidirectionally circumferentially wound) carbon composites. The analytical approach was verified with 3D FEA in terms of stress and strain.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:3:p:316-:d:92379
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    References listed on IDEAS

    as
    1. 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.
    2. Björn Nykvist & Måns Nilsson, 2015. "Rapidly falling costs of battery packs for electric vehicles," Nature Climate Change, Nature, vol. 5(4), pages 329-332, April.
    3. 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.
    4. 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.
    Full references (including those not matched with items on IDEAS)

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    Cited by:

    1. Hina Usman & Junaid Ikram & Khurram Saleem Alimgeer & Muhammad Yousuf & Syed Sabir Hussain Bukhari & Jong-Suk Ro, 2021. "Analysis and Optimization of Axial Flux Permanent Magnet Machine for Cogging Torque Reduction," Mathematics, MDPI, vol. 9(15), pages 1-14, July.
    2. Roberto Rocca & Savvas Papadopoulos & Mohamed Rashed & George Prassinos & Fabio Giulii Capponi & Michael Galea, 2020. "Design Trade-Offs and Feasibility Assessment of a Novel One-Body, Laminated-Rotor Flywheel Switched Reluctance Machine," Energies, MDPI, vol. 13(22), pages 1-19, November.

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