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Severe-duty cooling tower motors with bearing current protection

18th September 2015

Posted By Paul Boughton


Marathon Motors recently introduced a new line of totally-enclosed air-over (TEAO) cooling tower motors with BCP – Bearing Current Protection using AEGIS Shaft Grounding Rings.

These NEMA Premium Severe-Duty motors feature BlueChip quality 100% cast iron construction for rigidity and reduced vibration.

With internal and external epoxy paint, sealed bearings, T-drains in both endshields 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.

Designed for 10:1 VT or 20:1 CT operation with a variable frequency drive, motors have MAX GUARD Class F insulation and are equipped with AEGIS Bearing Protection Rings installed internally.

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.

Internal installation of the rings protects them from the extreme temperatures and moisture found in cooling tower applications and other severe environments.

Suitable for angle mounting, the motors are available in models from 3-250 HP.  They meet or exceed NEMA Premium efficiencies; are UL Recognised, CSA Certified, and F1/F2 capable; and come with a  three-year warranty.  They are ideal for use in cooling tower fans and blowers, pumps, compressors, condensers, and evaporators, as well as a variety of severe-duty processing applications.









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