Browsing: EDM damage

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 the mechanism of VFD-induced electrical stress on motor bearings and details how insulated bearings prevent failures like EDM and fluting. It provides actionable advice on selecting the right insulation technology based on motor size, application, and drive frequency to ensure long-term reliability.