Browsing: stray current

This guide explores how generator insulated bearings protect against magnetic asymmetry and grid harmonics, detailing the critical role of NDE insulation and shaft grounding in preventing catastrophic electrical failure.

This technical guide explores the mechanics of EDM bearing damage (electrical erosion) caused by stray shaft voltages in VFD applications. It outlines critical symptoms such as fluting and pitting, while offering proven prevention strategies like insulated bearings and shaft grounding rings.

This guide defines electrical fluting as a patterned bearing defect caused by repeated VFD-induced discharge events. It details the formation of the “washboard” pattern on raceways, identification through vibration and noise, and mitigation strategies such as grounding rings and insulated bearings.

This guide defines stray current in motors and explains its link to VFD operation and shaft voltage buildup. It details the resulting damage—such as electrical pitting and fluting—and provides actionable mitigation strategies, including shaft grounding rings and hybrid ceramic bearings, to extend motor reliability.

This complete guide explains the definition, materials (such as Aluminum Oxide), and structure of a bearing insulation layer. It details how these layers block harmful electrical currents to prevent EDM damage and extend motor life in industrial applications.

This guide explains how VFD-induced currents cause pump bearing and mechanical seal failures, and why selecting insulated (coated or hybrid) bearings is essential for protecting pumping systems.

This guide explains how to differentiate between electrical erosion (EDM) and mechanical fatigue in bearings by analyzing microscopic pitting patterns, auditory signs, and failure locations to ensure the correct maintenance solution is applied.

This comprehensive guide explains the origins of motor shaft voltage in VFD applications, outlines methods for accurate measurement using oscilloscopes, and compares mitigation strategies like grounding rings and insulated bearings to prevent failure.