VFD Induced Shaft Voltages
Damage Bearings

Motor with No
Bearing Protection

Variable frequency drives (VFD) on AC and DC motors induce harmful electrical voltages on the motor shaft. Once these voltages exceed the resistance of the bearing lubricant, they discharge through the motor's bearings causing fusion craters, severe pitting, fluting damage. Excessive bearing noise and eventually bearing failure is the result. Current diversion in the form of the patented AEGIS® shaft grounding is needed to make these motors sustainable.


Electrical Bearing Damage Protection

Motor with AEGIS®
Bearing Protection Ring

The AEGIS® SGR Bearing Protection Ring prevents electrical bearing fluting damage by safely diverting harmful shaft voltages and bearing currents to ground. Using proprietary Electron Transport Technology™, the conductive microfibers™ inside the AEGIS® SGR provide the most reliable current diversion technology for shaft grounding with a "path of least resistance" to dramatically extend motor life.

Download our Handbook...

Best Practices and Service Portfolio for Motor Repair and Service Providers

(available in several languages)

The Handbook Contains:

  • Introduction-New Motor Repair Standards for Inverters
  • About VFD Induced Shaft Voltages & Bearing Currents
  • Bearing Frosting & Fluting
  • Cutting and Inspecting a Bearing
  • Shaft Grounding Best Practices
  • AEGIS® Shaft Grounding Technology

31 Winterbrook Road Mechanic Falls, ME 04256
Phone: 207-998-5140   Toll Free: 1-866-738-1857  Fax: 207-998-5143

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