Featured Shaft Grounding Articles

Protecting AC Motors from Destructive Shaft Currents, NASA Tech Briefs Feb 2008 (PDF File)
Due to the high-speed switching frequencies used in PWM inverters, all variable frequency drives induce shaft current in AC Motor.

Engineered Systems White Paper Download
Electro Static Technology’s White Paper focuses on mitigating the variable frequency drive- (VFD-) induced shaft currents that can be extremely damaging to motor bearings, and a new technology that employs a circumferential ring of conductive micro fibers to discharge harmful currents and provide a low-cost solution to the problem.

Dealing with Shaft and Bearing Currents Presented by Tom Bishop, Technical Support Specialist, Electrical Apparatus Service Association.

This comprehensive paper addresses key issues relates to shaft and bearing currents in electric motors and generators... Topics include recognizing symptoms, methods of testing, and various solutions to mitigating bearing and shaft currents and new technology introductions such as the AEGIS Shaft Grounding Ring. The complete 53 page "Select Presentations" CD-ROM includes the 14 page paper as well as copies of the 39 slides. Order through EASA (PDF file).

Application of Static Charge Dissipation to Mitigate Electric Discharge Bearing Currents by H. William Oh
IEEE Paper-Application of Static Charge Dissipation to Mitigate Electric Discharge Bearing Currents, May 2007,. Presented by Dr. Annette Muetze and H. William Oh, M.E. This paper focuses on a new mitigation technique where any voltage build-up across the bearing is discharged via static charge dissipation through the AEGIS Shaft Grounding Ring.

Purdue Nanotechnology Labs Employ AEGIS Bearing Protection Ring for shaft grounding to ensure a constant flow of clean air.

New Shaft Grounding Brush Extends Life of AC and DC Motors By John R. Hall
Of The NEWS Staff