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On-line Access: 2024-03-13

Received: 2023-01-30

Revision Accepted: 2023-06-08

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Journal of Zhejiang University SCIENCE A 2024 Vol.25 No.3 P.251-267


Churning loss characteristics of a wet three-phase high-speed reluctance motor

Author(s):  Zhenzhou ZHANG, Mingzhu DAI, Chenchen ZHANG, Yi CHEN, Bin MENG

Affiliation(s):  College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310023, China

Corresponding email(s):   bin_meng@zjut.edu.cn

Key Words:  Motor pump, Wet motor, Churning loss, Analytical model, Computational fluid dynamics (CFD)

Zhenzhou ZHANG, Mingzhu DAI, Chenchen ZHANG, Yi CHEN, Bin MENG. Churning loss characteristics of a wet three-phase high-speed reluctance motor[J]. Journal of Zhejiang University Science A, 2024, 25(3): 251-267.

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author="Zhenzhou ZHANG, Mingzhu DAI, Chenchen ZHANG, Yi CHEN, Bin MENG",
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publisher="Zhejiang University Press & Springer",

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%T Churning loss characteristics of a wet three-phase high-speed reluctance motor
%A Zhenzhou ZHANG
%A Mingzhu DAI
%A Chenchen ZHANG
%J Journal of Zhejiang University SCIENCE A
%V 25
%N 3
%P 251-267
%@ 1673-565X
%D 2024
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A2300053

T1 - Churning loss characteristics of a wet three-phase high-speed reluctance motor
A1 - Zhenzhou ZHANG
A1 - Mingzhu DAI
A1 - Chenchen ZHANG
A1 - Yi CHEN
A1 - Bin MENG
J0 - Journal of Zhejiang University Science A
VL - 25
IS - 3
SP - 251
EP - 267
%@ 1673-565X
Y1 - 2024
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A2300053

With the increasing requirements of electro-hydrostatic actuators (EHAs) for power, volume, and pressure, there is a growing tendency in the industry to combine the motor and pump to form a so-called ‘motor pump’ to improve the integration. In this paper, a novel structure for a wet three-phase high-speed reluctance motor pump is proposed, which can further improve integration by removing the dynamic seal on the pump shaft, thereby avoiding the problems of dynamic seal wear and oil leakage and improving heat dissipation under high-speed working conditions. However, after the motor is wetted, the churning loss caused by immersion of the rotor in the oil causes additional fluid resistance torque. Based on fundamental fluid mechanics, an analytical model of the churning torque of a wet motor was established. To verify the accuracy of the analytical model, a simulation model of churning loss was established based on computational fluid dynamics (CFD), and the churning torque and flow field state were analyzed. Finally, an experimental prototype was designed and manufactured, and a test bench for churning loss was built. The oil churning torque was measured at different speeds and temperatures. The results from the analytical, simulation, and experimental models agreed well. The experimental results validated the analytical model and CFD simulation. This research provides a practical method for calculating the churning loss and serves as guidance for future optimization of churning loss reduction.




Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article


[1]CaiXZ, 2018. Analysis on the research status of motor pump at home and abroad. Hydraulics Pneumatics & Seals, 38(9):1-3 (in Chinese).

[2]ChaoQ, ZhangJH, XuB, et al., 2019. A review of high-speed electro-hydrostatic actuator pumps in aerospace applications: challenges and solutions. Journal of Mechanical Design, 141(5):050801.

[3]ClaarLM, HodgesRC, 1998. Integrated Electric Motor Driven in Line Hydraulic Pump. US Patent 5708311.

[4]FuYL, YangJY, ZhuDM, 2017. Finite element analysis of flow field and temperature field of electro-hydraulic pump by Fluent. Journal of Beijing University of Aeronautics and Astronautics, 43(8):1647-1653 (in Chinese).

[5]GaoDR, LiuJH, WenMS, 2010. Analysis of internal flow field of a new axial piston hydraulic motor pump. Journal of Yanshan University, 34(6):483-492 (in Chinese).

[6]GeYW, ZhuWL, LiuJH, et al., 2021. Refined modeling and characteristic analysis of electro-hydrostatic actuator. Journal of Mechanical Engineering, 57(24):66-73 (in Chinese).

[7]HuangY, DingC, WangHY, et al., 2020. Numerical and experimental study on the churning losses of 2D high-speed piston pumps. Engineering Applications of Computational Fluid Mechanics, 14(1):764-777.

[8]JensenKJ, EbbesenMK, HansenMR, 2021. Novel concept for electro-hydrostatic actuators for motion control of hydraulic manipulators. Energies, 14(20):6566.

[9]JiH, LiZF, WangZR, et al., 2010. Performance test of the prototype of electric motor pump. Transactions of the Chinese Society for Agricultural Machinery, 41(11):48-51 (in Chinese).

[10]JiH, ZhangJM, WangJL, et al., 2014. Charging effect of port-plate centrifugal pump in electric motor-pump. Journal of Mechanical Engineering, 50(10):177-182 (in Chinese).

[11]JiaoZX, LiZH, ShangYX, et al., 2022. Active load sensitive electro-hydrostatic actuator on more electric aircraft: concept, design, and control. IEEE Transactions on Industrial Electronics, 69(5):5030-5040.

[12]JinDC, RuanJ, LiS, et al., 2019. Modelling and validation of a roller-cam rail mechanism used in a 2D piston pump. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 20(3):201-217.

[13]JinZH, ZhaoLY, ZhaoXL, 2021. Research on characteristics of oil immersed motor for deep water servo application. Journal of Tianjin University of Technology, 37(3):40-44 (in Chinese).

[14]KittisaresS, HirotaY, NabaeH, et al., 2022. Alternating pressure control system for hydraulic robots. Mechatronics, 85:102822.

[15]LeeYN, MinkowyczWJ, 1989. Heat transfer characteristics of the annulus of two coaxial cylinders with one cylinder rotating. International Journal of Heat & Mass Transfer, 32(4):711-722.

[16]LeiZF, QinLJ, WuXD, et al., 2021. Research on fault diagnosis method of electro-hydrostatic actuator. Shock and Vibration, 2021:6688420.

[17]LiWF, LiuHF, GongX, 2016. Engineering Fluid Mechanics. 2nd Edition. East China University of Science and Technology Press, Shanghai, China, p.96-97 (in Chinese).

[18]LiYP, JiaoZX, YuT, et al., 2020. Viscous loss analysis of the flooded electro-hydrostatic actuator motor under laminar and turbulent flow states. Processes, 8(8):975.

[19]LiZF, ShaoYB, FuYL, et al., 2014. Oil gap loss and mechanical efficiency of axial piston electro-hydraulic pump. Journal of Beijing University of Aeronautics and Astronautics, 40(6):769-774 (in Chinese).

[20]LiuJ, 2021. Analysis of Cavitating Jet Characteristics of Axial Piston Pump Considering Viscosity Temperature Characteristics. MS Thesis, Taiyuan University of Technology, Taiyuan, China (in Chinese).

[21]Nouri-BorujerdiA, NakhchiME, 2017. Heat transfer enhancement in annular flow with outer grooved cylinder and rotating inner cylinder: review and experiments. Applied Thermal Engineering, 120:257-268.

[22]SAUERBIBUS, 1999. Electrical Motor with Integrated Axial Piston Pump Series J-RP Rotor Pump. https://www.sauerbibus.de/fileadmin/editors/countries/sab/Downloads/J-RP_007_0605.pdf

[23]SongBC, LeeDY, ParkSY, et al., 2019. Design and performance of nonlinear control for an electro-hydraulic actuator considering a wearable robot. Processes, 7(6):389.

[24]TaylorGI, 1923. VIII. Stability of a viscous liquid contained between two rotating cylinders. Philosophical Transactions of the Royal Society of London. Series A, Containing Papers of a Mathematical or Physical Character, 223(605-615):289-343.

[25]WangH, CaoC, GuoJ, et al., 2022. Design and friction loss study of full-ocean depth oil-filled direct current motor. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 23(8):587-598.

[26]WangY, GuoSR, DongHK, 2020. Modeling and control of a novel electro-hydrostatic actuator with adaptive pump displacement. Chinese Journal of Aeronautics, 33(1):365-371.

[27]WuY, XiWJ, ZhangCL, et al., 2022. Thermohydrodynamic lubrication analysis of micro gas bearing with journal misalignment. Journal of Aerospace Power, 37(9):‍1979-1991 (in Chinese).

[28]ZhangCC, RuanJ, XingT, et al., 2021. Research on the volumetric efficiency of a novel stacked roller 2D piston pump. Machines, 9(7):128.

[29]ZhangDJ, GaoDR, WangYJ, et al., 2008. Numerical calculation and analysis of electro-magnetic field of axial piston hydraulic motor pump based on ANSYS. Journal of Mechanical Engineering, 44(12):69-74 (in Chinese).

[30]ZhangY, 2020. Research on the Operating Characteristics and Structure Influence of the Rotary Energy Recovery Device. MS Thesis, Jiangsu University, Zhenjiang, China (in Chinese).

[31]ZhangYY, 2022. Thermal-Hydraulic Modeling and Structure Optimization of Oil-Immersed Motor Pump. MS Thesis, Yanshan University, Qinhuangdao, China (in Chinese).

[32]ZhuBH, QianPC, JiZQ, 2018. Research on the flow distribution characteristics and variable principle of the double-swashplate hydraulic axial piston electric motor pump with port valves. Journal of Mechanical Engineering, 54(20):220-234 (in Chinese).

[33]ZhuT, XieHB, YangHY, 2022. Design and tracking control of an electro-hydrostatic actuator for a disc cutter replacement manipulator. Automation in Construction, 142:104480.

[34]ZhuYC, XiaoQH, GaoMX, et al., 2018. Flow characteristics analysis of a two-phase suspension between rotating porous cylinders with radial and axial flows. Thermal Science, 22(4):1857-1864.

[35]ZouGW, HeZ, GuX, 2013. Viscous Fluid Dynamics. National Defense Industry Press, Beijing, China, p.215-219 (in Chinese).

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