Browsing: electrical discharge

This article demystifies the science of electrical discharge machining (EDM) in VFD motors, explaining how bearings act as capacitors and how insulation effectively blocks the destructive bearing electrical arcing that leads to raceway fluting and 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 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 technical guide analyzes how high-frequency SiC/GaN drives create destructive shaft voltages through high dV/dt and capacitive coupling, and why hybrid ceramic bearings are required over standard coatings to prevent failure.

This technical guide explains the destructive physics of “microwelding” caused by electrical arcing in bearings, detailing how VFDs and improper grounding melt raceways and how to prevent this damage.

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.