AEGIS (Mechanic Falls, ME) Shaft Grounding Rings have been made standard equipment on the Baldor-Reliance Food Safe line of motors. The addition of the internal shaft grounding ring provides increased motor reliability and stops early bearing failure from EDM. The Baldor Food Safe line consists of 25 models with horsepower ratings from ½ HP up to 10 HP. They are ideal for food processing, high pressure washdown, sanitary washdown, outdoor or caustic environment applications. AEGIS Shaft Grounding Rings have been integrated into these motors to mitigate the effects of bearing currents caused by variable frequency drives (VFDs). When VFDs are used to control AC motors, voltage is induced on the motor shaft. This voltage builds up until it is strong enough to discharge by arcing through the bearings, causing frosting, pitting, fusion craters, and fluting. Over time, this bearing current causes premature bearing failure.
AEGIS Shaft Grounding Rings protect motors by channeling VFD-induced bearing current safely to ground. Continuous circumferential rows of conductive microfibers, embedded securely in the ring’s patented AEGIS FiberLock channel, completely surround the motor shaft and provide millions of discharge points for harmful shaft voltage. This unique design creates the path of least resistance that effectively diverts current away from the bearings to ground. The microfibers themselves are specially engineered for exceptional conductivity and flexibility to minimize wear and prevent breakage.