A new 36-page, color handbook  — the AEGIS® Shaft Grounding Ring Motor Repair Handbook — describes best practices for protecting motor bearings from electrical damage. The book explains how to diagnose electrical bearing damage caused by variable frequency drives (VFDs), also known as inverters. It then goes on to explain in detail best practices for preventing such damage to motors of various sizes and horsepower ratings. Ideal for plant maintenance personnel as well as motor repair shops, the handbook is available in PDF format  for downloading free of charge. Bearing Protection Rings channel VFD-induced bearing currents safely to ground. Continuous circumferential rows of conductive microfibers embedded securely in the ring’s patented FiberLock™ channel completely surround the motor shaft and provide millions of discharge points for harmful shaft currents. This unique design creates the path of least resistance that effectively diverts these currents away from bearings to ground. The microfibers themselves are specially engineered for exceptional conductivity and flexibility to minimize wear and prevent breakage. The rings are the only long-term shaft grounding technology proven effective in hundreds of thousands of VFD/motor applications worldwide.
Electro Static Technology www.est-aegis.com/bearing 
The handbook explains how to diagnose electrical bearing damage caused by variable frequency drives (VFDs), also known as inverters. Ideal for plant maintenance personnel as well as motor repair shops.