Shaft Voltage from VFDs Damages Bearings
Motor with No Bearing Protection
Variable frequency drives (VFDs) on AC and DC motors create harmful electrical voltages on the motor shaft. If these voltages build up high enough, they will discharge through the motor's bearings, causing fusion craters, severe pitting, and fluting. Excessive bearing noise and eventually bearing failure is the result.
AEGIS® Shaft Grounding Ring
Motor with AEGIS® Bearing Protection
The AEGIS® Shaft Grounding Ring prevents electrical bearing damage by creating a path of least resistance. Current from the shaft travels harmlessly through the ring, instead of arcing through the bearings. The AEGIS® Ring's conductive microfibers™ provide the most reliable and long-lived current diversion of any shaft grounding system.
For more information, download or request a print copy of the AEGIS® Bearing Protection Handbook of best practices for bearing protection.
Or see the other bearing protection practices below.
Case Study-Container Port Cranes – Pacific Container Terminal adds the AEGIS® PRO Series Grounding Rings to their cranes