Drogi przepływu prądów łożyskowych w układach napędowych dużej mocy zasilanych napięciem sieciowym

Bearing currents are very widespread phenomenon in electric machines. In most cases their value is small; due to this fact they do not produce visible effects and they are out of sight for technical service. However, when, due to various reasons, bearing currents reach significant values, they cause very serious damages of bearings. Intensity of damages of bearings depends on bearing current intensity and its duration, rotational speed and on type of used grease. The paper also describes the methods for bearing currents elimination in high power drives.