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Flywheel energy storage system with a permanent magnet bearing and a pair of hybrid ceramic ball bearings

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Abstract

A flywheel energy storage system (FESS) with a permanent magnet bearing (PMB) and a pair of hybrid ceramic ball bearings is developed. A flexibility design is established for the flywheel rotor system. The PMB is located at the top of the flywheel to apply axial attraction force on the flywheel rotor, reduce the load on the bottom rolling bearing, and decrease the friction power loss. The magnetic force of the PMB is analyzed through finite element method, and the force with the air gap of the PMB is verified experimentally. A squeeze film damper (SFD) is introduced to support the bottom rolling bearing, suppress lateral vibration, and enhance the stability of the flywheel rotor system. A dynamic model of FESS is established through transfer matrix method, Jones-Harris rolling bearing theory, and a finite length bearing dynamic model for SFD, which is verified by measuring the amplitude-frequency response. The effect of SFD radial clearance and unbalanced mass distribution on the dynamics of FESS is discussed. A spin-down test for the FESS prototype is conducted in a moderate vacuum. Results show that the hybrid bearing and flexibility design for the rotor system allow for the use of a small rolling bearing to reduce the power loss of FESS caused by friction. The developed FESS is simple in structure, stable without active control, low in cost, and convenient in maintenance.

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Authors and Affiliations

  1. School of Mechanical Engineering, Southeast University, Nanjing, 211189, China

    Shuyun Jiang, Hongchang Wang & Shaobo Wen

Authors
  1. Shuyun Jiang
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  2. Hongchang Wang
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  3. Shaobo Wen
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Corresponding author

Correspondence to Shuyun Jiang.

Additional information

Recommended by Associate Editor Sung Hoon Ahn

Shuyun Jiang received his Ph.D. in Mechanical Engineering from Harbin Institute of Technology in 1997. He is currently a professor in the School of Mechanical Engineering, Southeast University. His research interests include flywheel energy storage, motorized spindle, rotor dynamics, and bearing technology.

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Jiang, S., Wang, H. & Wen, S. Flywheel energy storage system with a permanent magnet bearing and a pair of hybrid ceramic ball bearings. J Mech Sci Technol 28, 5043–5053 (2014). https://doi.org/10.1007/s12206-014-1125-z

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  • DOI: https://doi.org/10.1007/s12206-014-1125-z

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