When variable frequency drives (VFDs) are used to control AC motors, currents are induced on the motor shaft. These currents build up until they are strong enough to discharge through the bearings, causing frosting, pitting, fusion craters, and fluting. Over time, these discharges can lead to bearing failure and motor failure. The AEGIS SGR provides an alternate path to ground for these shaft currents, preventing bearing damage and extending motor life.

The patent-pending AEGIS SGR Conductive MicroFiber Brush is easily installed by sliding the ring over either end of the motor shaft and locking it in place with simple screw-on mounting brackets. Because no machining is required, the SGR can be installed in minutes — even in the field.

Unlike conventional shaft grounding brushes, which wear out quickly and lose their effectiveness, the AEGIS SGR’s conductive microfibers work with virtually no friction and no wear and last for the life of the motor. There are no RPM limitations on the operation of the motor.

The SGR is available in standard sizes to fit NEMA AC motors ranging from 1 to 1500 HP with shaft diameters from 0.311” to 6.020” (8 mm to 153 mm). Larger sizes are available for shafts with diameters greater than 6”.


• Shaft diameters: 0.311" to 6.02" (8mm to 153mm) • SGR for larger shaft sizes available • Ships with 4 mounting brackets, screws and washers.
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