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Design Trade-Offs and Feasibility Assessment of a Novel One-Body, Laminated-Rotor Flywheel Switched Reluctance Machine

Author

Listed:
  • Roberto Rocca

    (Electrical Systems Department, Fundación CIRCE (Centro de Investigación de Recursos y Consumos Energéticos — Research Centre for Energy Resources and Consumption), 50018 Zaragoza, Spain
    Department of Astronautical, Electrical and Energy Engineering (DIAEE), Sapienza University of Rome, 00184 Rome, Italy)

  • Savvas Papadopoulos

    (School of Engineering and Built Environment (SEBE), Edinburgh Napier University, Edinburgh EH10 5DT, UK)

  • Mohamed Rashed

    (Power Electronics, Machines and Control Group (PEMC), The University of Nottingham, Nottingham NG7 2RD, UK)

  • George Prassinos

    (Power Electronics, Machines and Control Group (PEMC), The University of Nottingham, Nottingham NG7 2RD, UK)

  • Fabio Giulii Capponi

    (Department of Astronautical, Electrical and Energy Engineering (DIAEE), Sapienza University of Rome, 00184 Rome, Italy)

  • Michael Galea

    (Key Laboratory of More Electric Aircraft Technology of Zhejiang Province, The University of Nottingham, Ningbo 315100, China)

Abstract

In a bid to respond to the challenges being faced in the installation of flywheel-based electric energy storage systems (EESSs) in customer-side facilities, namely high safety, high energy/power densities and low cost, research work towards the development of a novel, one-body, laminated-rotor flywheel, based on a switched reluctance machine (OBOLAR-Fly SR machine) is presented, where the laminated rotor provides both the energy storage and motor/generator functions. The one-body architecture improves compactness and robustness. Besides, the rotor’s laminated body ensures inherently high safety. From the design perspective, the rotor’s dual purpose causes the traditional electrical machines design aspects, such as power development, cooling, losses, torque ripple, etc., to clash with the typical requirements of a flywheel, namely in-vacuum operation and moment of inertia. This results in six main trade-offs to be addressed during the design process: rotor material, speed ratio, number of drive phases, split ratio, optimal vacuum level, and controller hysteresis band. A 60 kW, 2.2 kWh OBOLAR-Fly SR system is developed with a twofold objective: (1) provide an in-depth description of the six bespoke design trade-offs and give some useful guidelines to tackle them; (2) prove the OBOLAR-Fly concept and compare the prototype’s performance with the current state of the art flywheels. Preliminary experimental results prove the viability of the OBOLAR idea and show its competitiveness in terms of efficiency and power density. On the other hand, a gap in energy density to be filled in future research works is highlighted.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:22:p:5857-:d:442509
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    References listed on IDEAS

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    1. Mauro Andriollo & Roberto Benato & Andrea Tortella, 2020. "Design and Modeling of an Integrated Flywheel Magnetic Suspension for Kinetic Energy Storage Systems," Energies, MDPI, vol. 13(4), pages 1-22, February.
    2. 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.
    3. Elhoussin Elbouchikhi & Yassine Amirat & Gilles Feld & Mohamed Benbouzid & Zhibin Zhou, 2020. "A Lab-scale Flywheel Energy Storage System: Control Strategy and Domestic Applications," Energies, MDPI, vol. 13(3), pages 1-23, February.
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    5. Arani, A.A. Khodadoost & Karami, H. & Gharehpetian, G.B. & Hejazi, M.S.A., 2017. "Review of Flywheel Energy Storage Systems structures and applications in power systems and microgrids," Renewable and Sustainable Energy Reviews, Elsevier, vol. 69(C), pages 9-18.
    6. Zhiying Zhu & Jin Zhu & Hailang Zhu & Xi Zhu & Yajie Yu, 2020. "Optimization Design of an Axial Split-Phase Bearingless Flywheel Machine with Magnetic Sleeve and Pole-Shoe Tooth by RSM and DE Algorithm," Energies, MDPI, vol. 13(5), pages 1-18, March.
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    Cited by:

    1. Jonathan Velasco Costa & Paulo J. C. Branco, 2022. "Sensorless Switched Reluctance Machine and Speed Control: A Study to Remove the Position Encoder at High Speed of Operation," Energies, MDPI, vol. 15(5), pages 1-14, February.

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