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Analysis of flow field in the motor-reducer assembly with oil cooling under real driving conditions

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Abstract

The oil flow field in the motor-reducer assembly was investigated under real driving conditions to estimate the cooling performance and oil circulation. The flat, uphill, downhill, right-turn, and left-turn conditions were selected as driving conditions. First, to estimate cooling performance, the oil coverage on coil and churning phenomenon were analyzed. The downhill condition had the strongest effect of churning phenomenon, and the average temperature under this condition was 121.5 °C. Furthermore, to estimate oil circulation, oil transport between the motor and the reducer was analyzed. Under the left-turn condition, an insufficient amount of oil reached the outlet, and the flow rate of the oil pump was limited to 8.1 LPM at the oil temperature of 50 °C under the 10 LPM condition. This study provides important information about the oil flow field in the motor-reducer assembly under real driving conditions to improve cooling performance and oil circulation of EVs.

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References

  1. M. Yildirim, M. Polat and H. Kurum, A survey on comparison of electric motor types and drives used for electric vehicles, 16th International Power Electronics and Motion Control Conference and Exposition, Antalya (2014) 218–223.

  2. J. de Santiago, H. Bernhoff, B. Ekergård, S. Eriksson, S. Ferhatovic, R. Waters and M. Leijon, Electrical motor drivelines in commercial all-electric vehicles: a review, IEEE Trans. Veh. Technol., 61(2) (2012) 475–484.

    Article  Google Scholar 

  3. C. C. Chan, An overview of electric vehicle technology, Proceedings of the IEEE, 81(9) (1993) 1202–1213.

    Article  Google Scholar 

  4. C. Rhebergen, B. Bilgin, A. Emadi, E. Rowan and J. Lo, Enhancement of electric motor thermal management through axial cooling methods: a materials approach, 2015 IEEE Energy Conversion Congress and Exposition, Montreal (2015) 5682–5688.

  5. C. Li, Z. Guan, J. Li, B. Zhao and X. Ding, Optimal design of cooling system for water cooling motor used for mini electric vehicle, 2017 20th International Conference on Electrical Machines and Systems, Sydney (2017) 1–4.

  6. H. Chuan, R. Burke and Z. Wu, A comparative study on different cooling topologies for axial flux permanent magnet machine, 2019 IEEE Vehicle Power and Propulsion Conference, Hanoi (2019) 1–6.

  7. H. Z. de La Parra, F. Magnussen and S. Bosga, Challenges for electric machines and power electronics in automotive applications, International Conference on Ecological Vehicles and Renewable Energies, Monaco (2009).

  8. J. D. Widmer, R. Martin and B. C. Mecrow, Optimization of an 80-kW segmental rotor switched reluctance machine for automotive traction, IEEE Trans. Ind. Appl., 51(4) (2015) 2990–2999.

    Article  Google Scholar 

  9. W. Cai, X. Wu, M. Zhou, Y. Liang and Y. Wang, Review and development of electric motor systems and electric powertrains for new energy vehicles, Automotive Innovation, 4 (2021) 3–22.

    Article  Google Scholar 

  10. T. Ha and D. K. Kim, Study of injection method for maximizing oil-cooling performance of electric vehicle motor with hairpin winding, Energies, 14(3) (2021) 747.

    Article  Google Scholar 

  11. L. Ye, F. Tao, S. Wei, L. Qi and W. Xuhui, Experimental research on the oil cooling of the end winding of the motor, 2016 IEEE Energy Conversion Congress and Exposition, Milwaukee (2016) 1–4.

  12. Z. Liu, T. Winter and M. Schier, Comparison of thermal performance between direct coil cooling and water jacket cooling for electric traction motor based on lumped parameter thermal network and experimentation, 28th International Electric Vehicle Symposium and Exhibition 2015, Goyoang (2015).

  13. P. O. Gronwald and T. A. Kern, Traction motor cooling sys-tems: a literature review and comparative study, IEEE Transactions on Transportation Electrification, 7(4) (2021) 2892–2913.

    Article  Google Scholar 

  14. M. H. Park and S. C. Kim, Thermal characteristics and effects of oil spray cooling on in-wheel motors in electric vehicles, Appl. Therm. Eng., 152 (2019) 582–593.

    Article  Google Scholar 

  15. K. Farsane, P. Desevaux and P. K. Panday, Experimental study of the cooling of a closed type electric motor, Applied Thermal Engineering, 20(14) (2000) 1321–1334.

    Article  Google Scholar 

  16. E. Gundabattini, A. Mystkowski, A. Idzkowski, R. Raja Singh and D. G. Solomon, Thermal mapping of a high-speed electric motor used for traction applications and analysis of various cooling methods-a review, Energies, 14(5) (2021) 1472.

    Article  Google Scholar 

  17. T. Ha, N. G. Han, M. S. Kim, K. H. Rho and D. K. Kim, Experimental study on behavior of coolants, particularly the oil-cooling method, in electric vehicle motors using hairpin winding, Energies, 14(4) (2021) 956.

    Article  Google Scholar 

  18. T. Ha, Y. Kang, N. S. Kim, S. H. Park, S. H. Lee, D. K. Kim and H. S. Ryou, Cooling effect of oil cooling method on electric vehicle motors with hairpin winding, Journal of Mechanical Science and Technology, 35(1) (2021) 407–415.

    Article  Google Scholar 

  19. D. Tanguy, S. Harmand, J. Pellé and R. Yu, Erratum: experimental study of oil cooling systems for electric motors, Appl Therm Eng., 71(1) (2014) 607.

    Article  Google Scholar 

  20. P. Ponomarev, M. Polikarpova and J. Pyrhönen, Thermal modeling of directly-oil-cooled permanent magnet synchronous machine, 2012 20th International Conference on Electrical Machines, Marseille (2012) 1882–1887.

  21. Z. Huang, S. Nategh, V. Lassila, M. Alaküla and J. Yuan, Direct oil cooling of traction motors in hybrid drives, 2012 IEEE International Electric Vehicle Conference, Greenville (2012) 1–8.

  22. Prometech Software, ParticleWorks Theory Manual, Prometech Software Co., Ltd., Tokyo (2018) 3–9.

    Google Scholar 

Download references

Acknowledgments

This research was supported by the Chung-Ang University Graduate Research Scholarship in 2022. This work was supported by the National Fir Agency and the Korea Institute of Energy Technology Evaluation and Planning (KETEP) (No. 20008021). This work was supported by a Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korean government [MOTIE; grant number 20212050100010].

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Authors and Affiliations

  1. School of Mechanical Engineering, Chung-Ang University, Seoul, 06974, Korea

    Nyeongu Han, Ryanghoon Kim, Haelee Lee, Taeyoung Beom, Youngkyo Kim & Dongkyu Kim

  2. School of Computer Science and Engineering, Chung-Ang University, Seoul, 06974, Korea

    Dongkyu Kim

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  1. Nyeongu Han
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  2. Ryanghoon Kim
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  3. Haelee Lee
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  5. Youngkyo Kim
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Correspondence to Dongkyu Kim.

Additional information

Nyeongu Han obtained his B.S. and M.S. in Mechanical Engineering from Chung-Ang University, Seoul, South Korea. His research interests include thermodynamics, cooling of electric vehicle motors and lithium-ion battery.

Ryanghoon Kim obtained his B.S. and M.S. in Mechanical Engineering from Chung-Ang University, Seoul, South Korea. His research interests include thermodynamics and battery thermal runaway.

Haelee Lee obtained her B.S. and M.S. in Mechanical Engineering from Chung-Ang University, Seoul, South Korea. Her research interests include cooling of electric vehicle motors and fuel cell.

Taeyoung Beom obtained his B.S. in Mechanical Engineering from Chung-Ang University, Seoul, South Korea. His research interests include thermodynamics and cooling rotor of the electric vehicle motors.

Youngkyo Kim obtained his B.S. in Mechanical Engineering from Chung-Ang University, Seoul, South Korea. His research interests include thermodynamics and cooling rotor of the electric vehicle motors.

Dongkyu Kim is a Professor of Mechanical Engineering, Chung-Ang University, Seoul, Korea. His research interests include thermodynamics and polymer electrolyte membrane fuel cell, and fuel cell vehicles.

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Han, N., Kim, R., Lee, H. et al. Analysis of flow field in the motor-reducer assembly with oil cooling under real driving conditions. J Mech Sci Technol 37, 1539–1550 (2023). https://doi.org/10.1007/s12206-023-0239-6

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  • DOI: https://doi.org/10.1007/s12206-023-0239-6

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