Browsing: dielectric test

This technical article defines bearing dielectric strength, distinguishing it from breakdown voltage, and analyzes the performance differences between plasma-sprayed coatings and hybrid ceramic balls. It also explores critical testing standards like ASTM D149 and environmental factors like humidity that degrade insulation performance in VFD applications.

This article analyzes the physics behind bearing insulation breakdown voltage, detailing seven critical variables—from ceramic coating thickness and porosity to environmental humidity and PWM stress—that determine the safety and reliability of VFD motors.

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 comprehensive guide defines electrical erosion in bearings, explaining how VFD-induced currents cause pitting and fluting. It outlines practical inspection methods and details prevention strategies—such as shaft grounding and ceramic insulation—to protect industrial motors.

This guide details the feasibility of performing an insulated bearing replacement on standard motors. It outlines critical compatibility checks—including dimensions, clearance (C3/C4), and electrical testing—while providing best practices for installation to ensure protection against electrical discharge machining (EDM).