Analysis of flow field in the motor-reducer assembly with oil cooling under real driving conditions
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 o...
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| Published in | Journal of mechanical science and technology Vol. 37; no. 3; pp. 1539 - 1550 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Seoul
Korean Society of Mechanical Engineers
01.03.2023
Springer Nature B.V 대한기계학회 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 1738-494X 1976-3824 |
| DOI | 10.1007/s12206-023-0239-6 |
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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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| AbstractList | 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. KCI Citation Count: 0 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. |
| Author | Kim, Ryanghoon Kim, Youngkyo Lee, Haelee Beom, Taeyoung Kim, Dongkyu Han, Nyeongu |
| Author_xml | – sequence: 1 givenname: Nyeongu surname: Han fullname: Han, Nyeongu organization: School of Mechanical Engineering, Chung-Ang University – sequence: 2 givenname: Ryanghoon surname: Kim fullname: Kim, Ryanghoon organization: School of Mechanical Engineering, Chung-Ang University – sequence: 3 givenname: Haelee surname: Lee fullname: Lee, Haelee organization: School of Mechanical Engineering, Chung-Ang University – sequence: 4 givenname: Taeyoung surname: Beom fullname: Beom, Taeyoung organization: School of Mechanical Engineering, Chung-Ang University – sequence: 5 givenname: Youngkyo surname: Kim fullname: Kim, Youngkyo organization: School of Mechanical Engineering, Chung-Ang University – sequence: 6 givenname: Dongkyu surname: Kim fullname: Kim, Dongkyu email: dkyukim@cau.ac.kr organization: School of Mechanical Engineering, Chung-Ang University, School of Computer Science and Engineering, Chung-Ang University |
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| Keywords | Electric vehicles Thermal management Oil cooling Churning phenomenon Cooling performance Flow field |
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| References_xml | – reference: 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). – reference: GundabattiniEMystkowskiAIdzkowskiARaja SinghRSolomonD GThermal mapping of a high-speed electric motor used for traction applications and analysis of various cooling methods-a reviewEnergies2021145147210.3390/en14051472 – reference: 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. – reference: GronwaldP OKernT ATraction motor cooling sys-tems: a literature review and comparative studyIEEE Transactions on Transportation Electrification2021742892291310.1109/TTE.2021.3075844 – reference: 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). – reference: ParkM HKimS CThermal characteristics and effects of oil spray cooling on in-wheel motors in electric vehiclesAppl. Therm. Eng.201915258259310.1016/j.applthermaleng.2019.02.119 – reference: 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. – reference: 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. – reference: ChanC CAn overview of electric vehicle technologyProceedings of the IEEE19938191202121310.1109/5.237530 – reference: WidmerJ DMartinRMecrowB COptimization of an 80-kW segmental rotor switched reluctance machine for automotive tractionIEEE Trans. Ind. Appl.20155142990299910.1109/TIA.2015.2405051 – reference: FarsaneKDesevauxPPandayP KExperimental study of the cooling of a closed type electric motorApplied Thermal Engineering200020141321133410.1016/S1359-4311(99)00094-0 – reference: de SantiagoJBernhoffHEkergårdBErikssonSFerhatovicSWatersRLeijonMElectrical motor drivelines in commercial all-electric vehicles: a reviewIEEE Trans. Veh. Technol.201261247548410.1109/TVT.2011.2177873 – reference: 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. – reference: 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. – reference: 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. – reference: 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. – reference: HaTKangYKimN SParkS HLeeS HKimD KRyouH SCooling effect of oil cooling method on electric vehicle motors with hairpin windingJournal of Mechanical Science and Technology202135140741510.1007/s12206-020-1240-y – reference: HaTHanN GKimM SRhoK HKimD KExperimental study on behavior of coolants, particularly the oil-cooling method, in electric vehicle motors using hairpin windingEnergies202114495610.3390/en14040956 – reference: TanguyDHarmandSPelléJYuRErratum: experimental study of oil cooling systems for electric motorsAppl Therm Eng.201471160710.1016/j.applthermaleng.2014.05.021 – reference: HaTKimD KStudy of injection method for maximizing oil-cooling performance of electric vehicle motor with hairpin windingEnergies202114374710.3390/en14030747 – reference: Prometech SoftwareParticleWorks Theory Manual2018TokyoPrometech Software Co., Ltd.39 – reference: CaiWWuXZhouMLiangYWangYReview and development of electric motor systems and electric powertrains for new energy vehiclesAutomotive Innovation2021432210.1007/s42154-021-00139-z – ident: 239_CR11 doi: 10.1109/ECCE.2016.7855097 – ident: 239_CR1 doi: 10.1109/EPEPEMC.2014.6980715 – volume: 71 start-page: 607 issue: 1 year: 2014 ident: 239_CR19 publication-title: Appl Therm Eng. doi: 10.1016/j.applthermaleng.2014.05.021 – volume: 35 start-page: 407 issue: 1 year: 2021 ident: 239_CR18 publication-title: Journal of Mechanical Science and Technology doi: 10.1007/s12206-020-1240-y – ident: 239_CR4 doi: 10.1109/ECCE.2015.7310458 – start-page: 3 volume-title: ParticleWorks Theory Manual year: 2018 ident: 239_CR22 – volume: 61 start-page: 475 issue: 2 year: 2012 ident: 239_CR2 publication-title: IEEE Trans. Veh. Technol. doi: 10.1109/TVT.2011.2177873 – volume: 81 start-page: 1202 issue: 9 year: 1993 ident: 239_CR3 publication-title: Proceedings of the IEEE doi: 10.1109/5.237530 – ident: 239_CR20 doi: 10.1109/ICElMach.2012.6350138 – ident: 239_CR12 – volume: 51 start-page: 2990 issue: 4 year: 2015 ident: 239_CR8 publication-title: IEEE Trans. Ind. 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Eng. doi: 10.1016/j.applthermaleng.2019.02.119 – ident: 239_CR6 doi: 10.1109/VPPC46532.2019.8952185 – ident: 239_CR5 doi: 10.1109/ICEMS.2017.8056319 – volume: 14 start-page: 1472 issue: 5 year: 2021 ident: 239_CR16 publication-title: Energies doi: 10.3390/en14051472 – ident: 239_CR21 doi: 10.1109/IEVC.2012.6183163 |
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| Title | Analysis of flow field in the motor-reducer assembly with oil cooling under real driving conditions |
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