HVAC Case Studies

Installation of AEGIS^® SGR™ Bearing Protection Ring at Time Life Building (PDF)
Root cause of VFD induced bearing’s failure: Electrical voltages are induced onto the shaft of the motor through parasitic capacitive coupling between the stator and rotor. The high frequency voltage changes in the pulse width modulation (PWM) drives cause electrical discharge machining (EDM) when the currents arc through the dielectric oil film in the bearing. These bearing current discharges result in pitting and fluting of the bearing race and catastrophic bearing failure.[read more ]

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Motor Shaft Grounding Boosts Reliability of HVAC/R Systems
The new AEGIS^® SGR™ Conductive MicroFiber™ Shaft Grounding Brush from Electro Static Technology improves the reliability of HVAC/R systems by dramatically extending motor life. By protecting bearings from electrical damage for the life of the motor, the AEGIS^® SGR prevents bearing noise and costly motor repairs and downtime. It is ideal for OEM motor and fan manufacturers, repair shops, HVAC service contractors, and in-house maintenance departments and can be easily installed as part of a preventive maintenance program. Detailed technical information is available at www.est-aegis.com. [read more]