New Shaft Grounding Ring Handbook

A new 36-page, color handbook — the AEGIS® Shaft Grounding Ring Motor Repair Handbook — describes best practices for protecting motor bearings from electrical damage.

Shaft Grounding Ring HandbookwbAvailable from Electro Static Technology, manufacturer of AEGIS® shaft grounding rings, 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 at

“Users of VFD-driven motors have every right to expect uptime and reliability,” notes Adam Willwerth, EST’s sales and marketing manager. “A repair shop that fixes a motor’s bearing problem properly only has to do it once, and is therefore more likely to earn customer loyalty. Better yet, a shop that offers value-added services such as inspection, vibration analysis, thermography, and shaft-voltage testing can show a customer how the right preventive measures can head off future damage. Personnel who know what they are doing can now protect any motor’s bearings from electrical arcing — whether on a brand new motor prior to its installation or on a motor already in service.”

AEGIS® Bearing Protection Rings channel VFD-induced bearing currents safely to ground. Continuous circumferential rows of conductive microfibers embedded securely in the ring’s patented AEGIS® 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. AEGIS® rings are the only long-term shaft grounding technology proven effective in hundreds of thousands of VFD/motor applications worldwide.

For a copy of the new handbook, visit For more information, contact: Adam Willwerth, Sales and Marketing Manager, Electro Static Technology, 31 Winterbrook Road, Mechanic Falls, ME 04256, Toll-Free: 1-866-738-1857, TEL: (207) 998-5140, FAX: (207) 998-5143,