This technical analysis explores electrical pitting in VFD-driven motor bearings, explaining how shaft voltage creates microscopic erosion that can progress to catastrophic failure. It details methods for distinguishing electrical discharge damage from mechanical wear and outlines proven prevention strategies, such as shaft grounding rings and insulated bearings, to ensure long-term reliability.

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 technical guide defines bearing fluting and its connection to VFD-induced electrical currents. It explains how to distinguish the shiny “washboard” pattern from mechanical false brinelling and details prevention strategies, including shaft grounding rings and insulated bearings, to stop premature motor failure.