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.

中文翻译：

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电动汽车的电气轴承故障

在现代电气设备中，尤其是电动汽车中，逆变器控制系统会导致复杂的轴电压和轴承电流。在电动机中，许多零件都有电气故障问题，其中轴承是最敏感和最易损坏的组件。近年来，电动汽车中经常发生轴承电气故障，而轴承电气故障已成为一个关键问题，从更广泛的意义上讲，它限制了基于全电动机的动力系统的寿命。这篇综述的目的是对在以电动汽车为代表的电气环境中暴露的机械系统中的轴承过早失效提供全面的概述。讨论了轴承工作的电气环境，包括不同的组件以及轴电压和轴承电流的起源，以及包括各种形貌损坏和润滑故障在内的典型电气轴承故障模式。归纳和分析了电压/电流对摩擦/润滑性能的基本影响机理，并提出了相应的对策。最后，将对当前研究中的关键技术缺陷进行简要介绍，并对前沿方向的未来展望进行讨论。归纳和分析了电压/电流对摩擦/润滑性能的基本影响机理，并提出了相应的对策。最后，将对当前研究中的关键技术缺陷进行简要介绍，并对前沿方向的未来展望进行讨论。归纳和分析了电压/电流对摩擦/润滑性能的基本影响机理，并提出了相应的对策。最后，将对当前研究中的关键技术缺陷进行简要介绍，并对前沿方向的未来展望进行讨论。