Main Article Content
Abstract
This study presents a flywheel-assisted regenerative braking system (FARBS) designed to improve energy recovery and voltage stability in electric vehicles (EVs). Conventional regenerative braking systems (RBS) suffer from short energy retention durations and voltage fluctuations, limiting their efficiency. The proposed system incorporates a spherical shell flywheel (120 mm radius, 20 mm thickness, 3 kg mass) directly into the braking mechanism to prolong energy recovery and optimise braking efficiency. Experimental results demonstrate a 439% increase in energy recovery duration, extending from 1.15 seconds (2000 RPM) to 6.2 seconds (4500 RPM). Voltage retention improves significantly, increasing from 10.3V to 19.2V, ensuring sustained voltage delivery. Kinetic energy storage attains 580 J at 4500 RPM, exhibiting a 23.4% increase over 2000 RPM. The flywheel system quadruples power output longevity, sustaining 6.40 W for 6.2 seconds at 4500 RPM, compared to 2.2 seconds without the flywheel. Energy recovery efficiency peaks at 16 J at 4500 RPM, an improvement of 275% in comparison to the baseline 4 J. Optimisation analysis confirms that increasing flywheel mass (1 kg to 3 kg) improves energy recovery by 194%, while a spherical shell flywheel improves energy recovery, achieving 327 J. This is twice as much as that of a solid disk (162 J). Carbon fibre outperforms steel, boosting energy recovery by 94%, while increasing the thickness from 10 mm to 20 mm, and resulting in a 200% efficiency gain. These findings underline the superiority of flywheel-assisted energy recovery, paving the way for high-efficiency braking solutions in EVs, public transportation and railway networks.
Keywords
Article Details

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
References
- M. Amer, J. Masri, A. Dababat, U. Sajjad, and K. Hamid, “Electric vehicles: Battery technologies, charging standards, AI communications, challenges, and future directions,” Energy Conversion and Management: X, vol. 24, 2024, doi: 10.1016/j.ecmx.2024.100751.
 - G. G. Njema, R. B. O. Ouma, and J. K. Kibet, “A review on the recent advances in battery development and energy storage technologiese,” Journal of Renewable Energy, vol. 2024, 2024, doi: 10.1155/2024/2329261.
 - M. E. Amiryar and K. R. Pullen, “A review of flywheel energy storage system technologies and their applications,” Applied Sciences, vol. 7, no. 3, 2017, doi: 10.3390/app7030286.
 - C. F. Kusuma et al., “Energy Management System of Electric Bus Equipped with Regenerative Braking and Range Extender,” International Journal of Automotive Technology, vol. 22, no. 6, pp. 1651–1664, 2021, doi: 10.1007/s12239-021-0142-z.
 - C. Yang, T. Sun, W. Wang, Y. Li, Y. Zhang, and M. Zha, “Regenerative braking system development and perspectives for electric vehicles: An overview,” Renewable and Sustainable Energy Reviews, vol. 198, no. March, p. 114389, 2024, doi: 10.1016/j.rser.2024.114389.
 - Z. Zheng, D. Cai, O. Bamisile, and Q. Huang, “Optimization strategy for braking energy recovery of electric vehicles based on flywheel/battery hybrid energy storage system,” Journal of Energy Storage, vol. 103, no. PB, p. 114447, 2024, doi: 10.1016/j.est.2024.114447.
 - W. Wang, Y. Li, M. Shi, and Y. Song, “Optimization and control of battery-flywheel compound energy storage system during an electric vehicle braking,” Energy, vol. 226, p. 120404, 2021, doi: 10.1016/j.energy.2021.120404.
 - K. Erhan and E. Özdemir, “Prototype production and comparative analysis of high-speed flywheel energy storage systems during regenerative braking in hybrid and electric vehicles,” Journal of Energy Storage, vol. 43, no. September, 2021, doi: 10.1016/j.est.2021.103237.
 - A. T. Hamada and M. F. Orhan, “An overview of regenerative braking systems,” Journal of Energy Storage, vol. 52, no. PC, p. 105033, 2022, doi: 10.1016/j.est.2022.105033.
 - A. Fayad, H. Ibrahim, A. Ilinca, S. S. Karganroudi, and M. Issa, “Energy recovering using regenerative braking in diesel–electric passenger trains: Economical and technical analysis of fuel savings and ghg emission reductions,” Energies, vol. 15, no. 1, 2022, doi: 10.3390/en15010037.
 - L. I. Yanji, C. Ying, and L. I. Yiyang, “Design of regenerative braking and power quality harnessed synthetically system in traction substation based on flywheel energy storage,” Energy Storage Science and Technology, vol. 11, no. 12, 2022, doi: 10.19799/j.cnki.2095-4239.2022.0158.
 - H. Li, J. Chu, and S. Sun, “Development of a Flywheel Hybrid Power System in Vehicles without the Electric Drive Device Rated Capacity Limit,” World Electric Vehicle Journal, vol. 13, no. 2, p. 27, Jan. 2022, doi: 10.3390/wevj13020027.
 - A. P. Budijono, I. N. Sutantra, and A. S. Pramono, “Development of Flywheel Regenerative Capture System to Improve Electric Vehicle Energy Captured System,” in 2019 International Conference on Information and Communications Technology (ICOIACT), 2019, pp. 845–850. doi: 10.1109/ICOIACT46704.2019.8938552.
 - J. Jackiewicz, “A Flywheel-Based Regenerative Braking System for Railway Vehicles,” Acta Mechanica et Automatica, vol. 17, pp. 52–59, Jan. 2023, doi: 10.2478/ama-2023-0006.
 - C. Qiu and G. Wang, “New evaluation methodology of regenerative braking contribution to energy efficiency improvement of electric vehicles,” Energy Conversion and Management, vol. 119, pp. 389–398, Jul. 2016, doi: 10.1016/j.enconman.2016.04.044.
 - K. Itani, A. De Bernardinis, Z. Khatir, and A. Jammal, “Comparative analysis of two hybrid energy storage systems used in a two front wheel driven electric vehicle during extreme start-up and regenerative braking operations,” Energy Conversion and Management, vol. 144, pp. 69–87, 2017, doi: 10.1016/j.enconman.2017.04.036.
 - P. Sun, C. Zhang, B. Jin, Q. Wang, and H. Geng, “Timetable optimization for maximization of regenerative braking energy utilization in traction network of urban rail transit,” Computers & Industrial Engineering, vol. 183, p. 109448, 2023, doi: 10.1016/j.cie.2023.109448.
 - E. M. Szumska, “Regenerative Braking Systems in Electric Vehicles: A Comprehensive Review of Design, Control Strategies, and Efficiency Challenges,” Energies, vol. 18, no. 10, p. 2422, May 2025, doi: 10.3390/en18102422.
 - J. Hou, Z. Song, H. Hofmann, and J. Sun, “Adaptive model predictive control for hybrid energy storage energy management in all-electric ship microgrids,” Energy Conversion and Management, vol. 198, p. 111929, 2019, doi: 10.1016/j.enconman.2019.111929.
 - Y. Wang, Z. Wang, Y. Lv, and Y. Liu, “Strength Analysis of Carbon Fiber Composite Flywheel Energy Storage Rotor Based on Progressive Damage Failure,” Shock and Vibration, vol. 2024, no. 1, p. 5587542, 2024, doi: 10.1155/vib/5587542.
 - X. Dai, X. Ma, D. Hu, J. Duan, and H. Chen, “An overview of the R&D of flywheel energy storage technologies in China,” Energies, vol. 17, no. 22, p. 5531, 2024, doi: 10.3390/en17225531.
 - A. G. Olabi, T. Wilberforce, M. A. Abdelkareem, and M. Ramadan, “Critical Review of Flywheel Energy Storage System,” Energies, vol. 14, no. 8, p. 2159, Apr. 2021, doi: 10.3390/en14082159.
 - D. W. Wang, M. X. Liu, W. J. Qian, X. Wu, Q. Ma, and Z. Q. Wu, “Parametrical Investigation of Piezoelectric Energy Harvesting via Friction‐Induced Vibration,” Shock and Vibration, vol. 2020, no. 1, p. 6190215, 2020, doi: 10.1155/2020/6190215.
 - A. Yildiz and M. A. Özel, “A Comparative Study of Energy Consumption and Recovery of Autonomous Fuel-Cell Hydrogen–Electric Vehicles Using Different Powertrains Based on Regenerative Braking and Electronic Stability Control System,” Applied Sciences, vol. 11, no. 6, p. 2515, Mar. 2021, doi: 10.3390/app11062515.
 - O. Aydogmus, G. Boztas, and R. Celikel, “Design and analysis of a flywheel energy storage system fed by matrix converter as a dynamic voltage restorer,” Energy, vol. 238, p. 121687, 2022, doi: 10.1016/j.energy.2021.121687.
 - F. Jiang et al., “A comprehensive review of energy storage technology development and application for pure electric vehicles,” Journal of Energy Storage, vol. 86, p. 111159, May 2024, doi: 10.1016/j.est.2024.111159.
 - M. Senyuk et al., “Fast Algorithms for Estimating the Disturbance Inception Time in Power Systems Based on Time Series of Instantaneous Values of Current and Voltage with a High Sampling Rate,” Mathematics, vol. 10, no. 21, p. 3949, Oct. 2022, doi: 10.3390/math10213949.
 - L. Jin, Y. He, C.-K. Zhang, X.-C. Shangguan, L. Jiang, and M. Wu, “Robust Delay-Dependent Load Frequency Control of Wind Power System Based on a Novel Reconstructed Model,” IEEE transactions on cybernetics, vol. PP, Feb. 2021, doi: 10.1109/TCYB.2021.3051160.
 - C. Lee, C. Tryfonidis, and M. Ong, “Power Performance and Response Analysis of a Semi-submersible Wind Turbine Combined Flap Type and Torus Wave Energy Converters,” Journal of Offshore Mechanics and Arctic Engineering, vol. 145, pp. 1–33, Dec. 2022, doi: 10.1115/1.4056520.
 - A. J. Hutchinson and D. T. Gladwin, “Capacity factor enhancement for an export limited wind generation site utilising a novel Flywheel Energy Storage strategy,” Journal of Energy Storage, vol. 68, p. 107832, 2023, doi: 10.1016/j.est.2023.107832.
 - I. Župan, V. Šunde, Ž. Ban, and B. Novoselnik, “Regenerative Braking Energy Flow Control Algorithm for Power Grid Voltage Stabilization in Mobile Energy Storage Systems,” Energies, vol. 18, no. 2, p. 410, 2025, doi: 10.3390/en18020410.
 - M. Sriram and A. Bhattacharya, “Analysis and optimization of triple tube phase change material based energy storage system,” Journal of Energy Storage, vol. 36, p. 102350, 2021, doi: 10.1016/j.est.2021.102350.
 - A. Recalde, R. Cajo, W. Velasquez, and M. S. Alvarez-Alvarado, “Machine Learning and Optimization in Energy Management Systems for Plug-In Hybrid Electric Vehicles: A Comprehensive Review,” Energies, vol. 17, no. 13, p. 3059, Jun. 2024, doi: 10.3390/en17133059.
 - S. Sagaria, M. van der Kam, and T. Boström, “Vehicle-to-grid impact on battery degradation and estimation of V2G economic compensation,” Applied Energy, vol. 377, p. 124546, Jan. 2025, doi: 10.1016/j.apenergy.2024.124546.
 
