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Design of a Low-Loss, Low-Cost Rolling Element Bearing System for a 5 kWh/100 kW Flywheel Energy Storage System

Author

Listed:
  • Peter Haidl

    (Myonic Gmbh, 88299 Leutkirch im Allgäu, Germany)

  • Armin Buchroithner

    (Institute of Electrical Measurement and Sensor Systems, Graz University of Technology, 8010 Graz, Austria)

Abstract

The bearings of a flywheel energy storage system (FESS) are critical machine elements, as they determine several important properties such as self-discharge, service life, maintenance intervals and most importantly cost. This paper describes the design of a low-cost, low-loss bearing system for a 5 kWh/100 kW FESS based on analytical, numerical and experimental methods. The special operating conditions of the FESS rotor (e.g., high rotational speeds, high rotor mass, vacuum) do not allow isolated consideration of the bearings alone, but require a systematic approach, taking into account aspects of rotor dynamics, thermal management, bearing loads and lubrication. The proposed design incorporates measures to mitigate both axial and radial bearing loads, by deploying resilient bearing seats and a lifting magnet for rotor weight compensation. As a consequence of minimized external loading, bearing kinematics also need to be considered during the design process. A generally valid, well-structured guideline for the design of such low-loss rolling bearing systems is presented and applied to the 5 kWh/100 kW FESS use case.

Suggested Citation

  • Peter Haidl & Armin Buchroithner, 2021. "Design of a Low-Loss, Low-Cost Rolling Element Bearing System for a 5 kWh/100 kW Flywheel Energy Storage System," Energies, MDPI, vol. 14(21), pages 1-28, November.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7195-:d:670371
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    References listed on IDEAS

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    1. Bernd Thormann & Thomas Kienberger, 2020. "Evaluation of Grid Capacities for Integrating Future E-Mobility and Heat Pumps into Low-Voltage Grids," Energies, MDPI, vol. 13(19), pages 1-30, September.
    2. Peter Haidl & Armin Buchroithner & Bernhard Schweighofer & Michael Bader & Hannes Wegleiter, 2019. "Lifetime Analysis of Energy Storage Systems for Sustainable Transportation," Sustainability, MDPI, vol. 11(23), pages 1-21, November.
    3. Abdul Ghani Olabi & Tabbi Wilberforce & Mohammad Ali Abdelkareem & Mohamad Ramadan, 2021. "Critical Review of Flywheel Energy Storage System," Energies, MDPI, vol. 14(8), pages 1-33, April.
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    1. Si-Woo Song & Won-Ho Kim & Ju Lee & Dong-Hoon Jung, 2023. "A Study on Weight Reduction and High Performance in Separated Magnetic Bearings," Energies, MDPI, vol. 16(7), pages 1-13, March.
    2. Hongjin Hu & Haoze Wang & Kun Liu & Jingbo Wei & Xiangjie Shen, 2022. "A Simplified Space Vector Pulse Width Modulation Algorithm of a High-Speed Permanent Magnet Synchronous Machine Drive for a Flywheel Energy Storage System," Energies, MDPI, vol. 15(11), pages 1-21, June.

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