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| 1 | Electrical bearing failures in electric vehicles显示文摘In modern electric equipment,especially electric vehicles,inverter control systems can lead to complex shaft voltages and bearing currents.Within an electric motor,many parts have electrical failure problems,and among which bearings are the most sensitive and vulnerable components.In recent years,electrical failures in bearing have been frequently reported in electric vehicles,and the electrical failure of bearings has become a key issue that restricts the lifetime of all‐electric motor‐based power systems in a broader sense.The purpose of this review is to provide a comprehensive overview of the bearing premature failure in the mechanical systems exposed in an electrical environment represented by electric vehicles.The electrical environments in which bearing works including the different components and the origins of the shaft voltages and bearing currents,as well as the typical modes of electrical bearing failure including various topographical damages and lubrication failures,have been discussed.The fundamental influence mechanisms of voltage/current on the friction/lubrication properties have been summarized and analyzed,and corresponding countermeasures have been proposed.Finally,a brief introduction to the key technical flaws in the current researches will be made and the future outlook of frontier directions will be discussed. | Feng HE Guoxin XIE Jianbin LUO | 2020 | Friction2020，8，1： | 8 |
| 2 | Tribological Properties of Lubricating Oils with Triethanolamine Borate under Electromagnetic Field显示文摘Tribological properties of 150SN mineral oil and lubricating oils containing triethanolamine borate(TBE)with and without electromagnetic field impact were evaluated on a modified four-ball tribo-tester.The characteristics of the worn surfaces were studied by scanning electronic microscopy(SEM),energy dispersive spectrometry(EDS)and X-ray photoelectron spectroscopy(XPS).Moreover,the tribological mechanisms are discussed from the viewpoint of physical effect and chemical effect.The results indicated that the friction coefficients and wear scar diameters(WSDs)lubricated by 150SN mineral oil under electromagnetic field were higher than those without electromagnetism impact.The WSDs of steel balls lubricated by TBE-doped oils under electromagnetic field were smaller than those obtained from non-electromagnetic field,but the friction coefficients were higher than those under non-electromagnetic field.A protective coating consists of wear particles could be formed on the frictional surface due to the physical effect of electromagnetic field on wear debris.The electromagnetic field could facilitate the interaction of elemental boron and nitrogen in TBE with metal interfaces,and contributes to forming tribo-chemical reaction film to reduce friction and wear. | Wang Xin Fang Jianhua Jiang Zeqi Gu Kecheng Liu Ping | 2019 | China Petroleum Processing & Petrochemical Technology2019，21，3： | 2 |
| 3 | 外加直流电场对DLC/PAO固液复合润滑体系摩擦学行为的影响显示文摘本文中利用球-盘式载流摩擦试验机研究了DLC/PAO固液复合润滑体系在外加直流电场中的摩擦学行为,考察摩擦副滑动速度、加载电压以及回路电流的影响,结果表明:外加直流电场对复合润滑体系摩擦磨损行为的影响与摩擦副的滑动速度密切相关,这源于不同润滑状态时DLC薄膜的电气损伤行为以及薄膜的结构、成分变化.根据润滑状态和外加电压的不同,DLC薄膜的电气损伤可以表现为线状隆起或烧蚀坑,其中线状隆起型损伤源于载流摩擦界面的焦耳热,烧蚀坑损伤则源于摩擦对偶之间的拉弧放电及PAO油膜的击穿.Raman光谱显示电气损伤区DLC薄膜发生显著的石墨化转变,且石墨化程度取决于回路电流的大小.外加电场条件下DLC薄膜的石墨化转变虽然在一定条件下可使复合润滑体系的摩擦系数降低,但削弱了DLC薄膜的抗磨性能,使薄膜的磨损表现为电气损伤和机械磨损的耦合. | 丁奇 汤金柱 张松伟 李昊坤 胡丽天 | 2017 | 摩擦学学报2017，37，6： | 1 |
| 4 | 含轴电流损伤的球轴承动力学建模及特性分析显示文摘以风力发电机球轴承为研究对象,提出了凹坑形式的轴电流损伤模型,分析该损伤对轴承动力学特性的影响规律.利用半正弦和分段激励函数建立了一个含长度、宽度和深度的损伤模型,用于描述轴电流的不同损伤程度;建立了含轴电流损伤的轴承动力学模型,来研究损伤凹坑的大小和形状及外载荷对轴承的振动特性影响;通过轴承的接触分析,研究了轴电流损伤程度对轴承载荷分布的影响;将仿真结果和实验对比,验证了模型的正确性.研究结果表明:所提出的模型可以准确地描述由凹坑形式的轴电流损伤导致的冲击激励与周期性变化现象;随着轴电流损伤程度的增大,轴承的振动响应和接触力变大,系统趋于不稳定. | 李小彭 曲兴超 李柏涛 苏晶 | 2023 | 东北大学学报(自然科学版)2023，44，10： | 0 |
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