In an electric environment, electrolytic corrosion from stray currents threatens bearing performance. NTN’s coated angular contact ball and cylindrical roller bearings, the MEGAOHM Series, insulate the bearings from electric current. A special ceramic coating applied to the outer surface and side faces of the outer ring prevents current from passing though the bearing. The design…

Electrical pitting and erosion, failure modes common in the wind-energy industry, occur in bearings on generators in wind turbines. The failure modes are caused by stray current passing through the bearing. The current arcs from one surface to another to find a ground. So as current goes through the bearing outer ring, it arcs from…