Abstract
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.
摘要
目的
传统干式电机在高速工况下存在动密封磨损和油液泄露等问题。1. 本文通过电机湿式化提出一种湿式三相高速磁阻电机泵的新结构以去除动密封。2. 简化电机泵结构并提高集成度,以通过油液的循环流动改善电机散热问题。3. 集中研究电机湿式化后所引起的搅拌损失问题,为后续湿式电机搅油阻力矩的减阻优化提供一种较好的计算方法。
创新点
1. 提出一种新型湿式三相高速磁阻电机泵,并通过O型密封圈来构成湿式耐高压结构,避免了高速工况下的动密封磨损、油液泄露和发热严重等问题;2. 通过理论分析,推导出湿式电机搅油阻力矩的解析模型;3. 基于计算流体力学(CFD)建立湿式电机搅油的仿真模型,并对其运行过程中所受到的阻力矩和内部流场状态进行分析;4. 设计制造实验样机,搭建湿式电机搅油的实验台架,并测试不同转速和温度下的搅油阻力矩。
方法
1. 通过理论分析,建立湿式电机搅油阻力矩的解析模型(公式(26));2. 通过仿真模拟,对电机运行过程中内部流场状态(图9和10)与其受到的流体阻力矩(图11和12)进行分析,验证解析模型的有效性(图13和14);3. 通过湿式电机搅油样机和实验台架(图15和16)测试不同转速和温度下的搅油阻力矩,验证解析模型和仿真模拟的有效性(图19和20)。
结论
1. 湿式三相高速磁阻电机泵的新结构能够去除传统动密封,使其无需克服动密封摩擦力;这大大简化了电机泵的结构,提高了集成度,使其可通过油液的循环流动改善电机散热问题。2. 电机搅油阻力矩与内部流场参数之间存在映射关系,因此可通过建立解析模型实现关联表征;通过CFD对湿式电机搅油进行仿真模拟,能够验证解析模型的有效性,为电机流场求解提供一种较好的方法。3. 实验结果验证了解析模型和仿真模拟的有效性;三者的搅油阻力矩在不同转速、不同温度下的曲线趋势吻合良好,为后续湿式电机搅油阻力矩的减阻优化提供了一种较好的计算方法。4. 在高速运转过程中,电机的侧面搅油阻力矩占总搅油阻力矩的比重很大,所以如何优化电机结构参数以减小其侧面搅油阻力矩是该湿式电机能否得以成功应用的关键所在。
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References
Cai XZ, 2018. Analysis on the research status of motor pump at home and abroad. Hydraulics Pneumatics & Seals, 38(9): 1–3 (in Chinese). https://doi.org/10.3969/10.3969/j.issn.1008-0813.2018.09.001
Chao Q, Zhang JH, Xu B, 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. https://doi.org/10.3969/10.1115/1.4041582
Claar LM, Hodges RC, 1998. Integrated Electric Motor Driven in Line Hydraulic Pump. US Patent 5708311.
Fu YL, Yang JY, Zhu DM, 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). https://doi.org/10.3969/10.13700/j.bh.1001-5965.2016.0605
Gao DR, Liu JH, Wen MS, 2010. Analysis of internal flow field of a new axial piston hydraulic motor pump. Journal of Yanshan University, 34(6):483–492 (in Chinese). https://doi.org/10.3969/10.3969/j.issn.1007-791X.2010.06.002
Ge YW, Zhu WL, Liu JH, et al., 2021. Refined modeling and characteristic analysis of electro-hydrostatic actuator. Journal of Mechanical Engineering, 57(24):66–73 (in Chinese). https://doi.org/10.3969/10.3901/JME.2021.24.066
Huang Y, Ding C, Wang HY, 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. https://doi.org/10.3969/10.1080/19942060.2020.1763468
Jensen KJ, Ebbesen MK, Hansen MR, 2021. Novel concept for electro-hydrostatic actuators for motion control of hydraulic manipulators. Energies, 14(20):6566. https://doi.org/10.3969/10.3390/en14206566
Ji H, Li ZF, Wang ZR, 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). https://doi.org/10.3969/10.3969/j.issn.1000-1298.2010.11.009
Ji H, Zhang JM, Wang JL, et al., 2014. Charging effect of portplate centrifugal pump in electric motor-pump. Journal of Mechanical Engineering, 50(10): 177–182 (in Chinese). https://doi.org/10.3969/10.3901/JME.2014.10.177
Jiao ZX, Li ZH, Shang YX, 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. https://doi.org/10.3969/10.1109/TIE.2021.3084179
Jin DC, Ruan J, Li S, 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. https://doi.org/10.3969/10.1631/jzus.A1800085
Jin ZH, Zhao LY, Zhao XL, 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). https://doi.org/10.3969/10.3969/j.issn.1673-095X.2021.03.008
Kittisares S, Hirota Y, Nabae H, et al., 2022. Alternating pressure control system for hydraulic robots. Mechatronics, 85: 102822. https://doi.org/10.3969/10.1016/j.mechatronics.2022.102822
Lee YN, Minkowycz WJ, 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. https://doi.org/10.3969/10.1016/0017-9310(89)90218-4
Lei ZF, Qin LJ, Wu XD, et al., 2021. Research on fault diagnosis method of electro-hydrostatic actuator. Shock and Vibration, 2021:6688420. https://doi.org/10.3969/10.1155/2021/6688420
Li WF, Liu HF, Gong X, 2016. Engineering Fluid Mechanics. 2nd Edition. East China University of Science and Technology Press, Shanghai, China, p.96–97 (in Chinese).
Li YP, Jiao ZX, Yu T, et al., 2020. Viscous loss analysis of the flooded electro-hydrostatic actuator motor under laminar and turbulent flow states. Processes, 8(8):975. https://doi.org/10.3969/10.3390/pr8080975
Li ZF, Shao YB, Fu YL, 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). https://doi.org/10.3969/10.13700/j.bh.1001-5965.2013.0438
Liu J, 2021. Analysis of Cavitating Jet Characteristics of Axial Piston Pump Considering Viscosity Temperature Characteristics. MS Thesis, Taiyuan University of Technology, Taiyuan, China (in Chinese). https://doi.org/10.3969/10.27352/d.cnki.gylgu.2021.000756
Nouri-Borujerdi A, Nakhchi ME, 2017. Heat transfer enhancement in annular flow with outer grooved cylinder and rotating inner cylinder: review and experiments. Applied Thermal Engineering, 120:257–268. https://doi.org/10.3969/10.1016/j.applthermaleng.2017.03.095
SAUER BIBUS, 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
Song BC, Lee DY, Park SY, et al., 2019. Design and performance of nonlinear control for an electro-hydraulic actuator considering a wearable robot. Processes, 7(6):389. https://doi.org/10.3969/10.3390/pr7060389
Taylor GI, 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. https://doi.org/10.3969/10.1098/rsta.1923.0008
Wang H, Cao C, Guo J, 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. https://doi.org/10.3969/10.1631/JZUS.A2100375
Wang Y, Guo SR, Dong HK, 2020. Modeling and control of a novel electro-hydrostatic actuator with adaptive pump displacement. Chinese Journal of Aeronautics, 33(1):365–371. https://doi.org/10.3969/10.1016/j.cja.2018.05.020
Wu Y, Xi WJ, Zhang CL, et al., 2022. Thermohydrodynamic lubrication analysis of micro gas bearing with journal misalignment. Journal of Aerospace Power, 37(9):1979–1991 (in Chinese). https://doi.org/10.3969/10.13224/j.cnki.jasp.20210209
Zhang CC, Ruan J, Xing T, et al., 2021. Research on the volumetric efficiency of a novel stacked roller 2D piston pump. Machines, 9(7):128. https://doi.org/10.3969/10.3390/machines9070128
Zhang DJ, Gao DR, Wang YJ, 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). https://doi.org/10.3969/10.3901/JME.2008.12.069
Zhang Y, 2020. Research on the Operating Characteristics and Structure Influence of the Rotary Energy Recovery Device. MS Thesis, Jiangsu University, Zhenjiang, China (in Chinese). https://doi.org/10.3969/10.27170/d.cnki.gjsuu.2020.001417
Zhang YY, 2022. Thermal-Hydraulic Modeling and Structure Optimization of Oil-Immersed Motor Pump. MS Thesis, Yanshan University, Qinhuangdao, China (in Chinese). https://doi.org/10.3969/10.27440/d.cnki.gysdu.2022.001234
Zhu BH, Qian PC, Ji ZQ, 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). https://doi.org/10.3969/10.3901/JME.2018.20.220
Zhu T, Xie HB, Yang HY, 2022. Design and tracking control of an electro-hydrostatic actuator for a disc cutter replacement manipulator. Automation in Construction, 142:104480. https://doi.org/10.3969/10.1016/j.autcon.2022.104480
Zhu YC, Xiao QH, Gao MX, 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. https://doi.org/10.3969/10.2298/TSCI1804857Z
Zou GW, He Z, Gu X, 2013. Viscous Fluid Dynamics. National Defense Industry Press, Beijing, China, p. 215–219 (in Chinese).
Acknowledgments
This work is supported by the National Key R&D Program of China (No. 2019YFB2005202).
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Bin MENG designed the research. Zhenzhou ZHANG and Mingzhu DAI processed the corresponding data. Zhenzhou ZHANG wrote the first draft of the manuscript. Chenchen ZHANG and Yi CHEN helped to organize the manuscript. Bin MENG revised and edited the final version.
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Zhenzhou ZHANG, Mingzhu DAI, Chenchen ZHANG, Yi CHEN, and Bin MENG declare that they have no conflict of interest.
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Zhang, Z., Dai, M., Zhang, C. et al. Churning loss characteristics of a wet three-phase high-speed reluctance motor. J. Zhejiang Univ. Sci. A 25, 251–267 (2024). https://doi.org/10.1631/jzus.A2300053
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DOI: https://doi.org/10.1631/jzus.A2300053