Abstract
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.
Highlights
The first concept electric car was exhibited in the 1830s, and commercial electric cars came out at the end of the 19th century [1]
The technical field of electric vehicles has been greatly expanded in the past decades, and great progress has been made in tackling the key issues such as batteries, electric motor drives, automotive technology and system integration [12–16]
This paper provides a detailed review of the key research progresses on the electrical bearing failures
Summary
The first concept electric car was exhibited in the 1830s, and commercial electric cars came out at the end of the 19th century [1]. Http://friction.tsinghuajournals.com∣www.Springer.com/journal/40544 | Friction failures in bearings will gradually emerge with the popularity of electric vehicles in the near future. Under these circumstances, in order to ensure the long-term stability of the bearings in electric vehicles, it is of great industrial and scientific significance to deepen and update the influences of an electric environment on the bearing-lubrication system. Brief comments on the current research progress will be given and a future prospect of failure researches in an electrical environment will be proposed
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