Marathon Motors (Wausau, WI) introduced totally enclosed air-over (TEAO) cooling tower motors with Bearing Current Protection (BCP) using AEGIS® Shaft Grounding Rings. The NEMA Premium Severe-Duty motors feature BlueChip® cast iron construction for rigidity and reduced vibration. With internal and external epoxy paint, sealed bearings, T-drains in both end-shields for effective drainage, drive-end bearing isolators with shaft slingers, and fully gasketed conduit boxes (with lead separators), they are IP56-rated and built to withstand the harsh environments of cooling towers.
The motors have MAX GUARD® Class F insulation, and the AEGIS® rings channel VFD-induced shaft currents away from motor bearings and safely to ground, protecting bearings from electrical damage including EDM pitting, frosting, fluting, and premature failure. Suitable for angle mounting, the motors are available in models from 3-250 HP. They are suited for fans and blowers, pumps, compressors, condensers, and evaporators, as well as a variety of severe-duty processing applications.
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