April 2017 Electro Static Technology

Protect Cooling Tower Motors from VFD-Induced Bearing Damage with AEGIS® Shaft Grounding Rings

Download AEGIS® Bearing Protection

Handbook

Cooling towers are hostile environments... so hostile that standard motors cannot survive them for very long.

Cooling tower motors are specially designed and sealed to protect them against the high temperatures and humidity common in these environments.

But while these motors are protected against external threats, many are still susceptible to internal threats.

To match cooling tower capacity to changing loads, many cooling tower motors are now controlled by variable frequency drives (VFDs or inverters). And although VFDs provide exceptional control of motor speed and generate significant energy savings, they also induce damaging voltages on the shafts of the motors they control... voltages that discharge through bearings, destroying them in as little as 3 months!

To be truly equipped to survive cooling tower duty, these motors need protection against VFD induced bearing damage as well environmental conditions. Fortunately, a growing number of motor manufacturers now offer cooling tower motors with AEGIS® Bearing Protection Rings factory installed inside the motor. In addition to protecting the motor from VFD-induced bearing damage, internal installation protects the AEGIS® Ring from the extreme temperatures and humidity prevailing in cooling towers.

Marathon TEAO Cooling Tower Motors with BCP (Bearing Current Protection) are specially designed for VFD-operation in severe cooling tower environments. They are available off-the-shelf in 3 - 250 HP ratings with AEGIS® Bearing Protection Rings installed internally. These IP 56-rated motors have all cast iron construction and Class F insulation, meet or exceed NEMA premium efficiencies, and come with sealed bearings and T-drains in both end shields for effective drainage. They are also fitted with a drive end bearing isolator with shaft slinger and a fully gasketed conduit box, and are suitable for angle mounting. They are F1/F2 capable, and come with a 3-year warranty.

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Internal installation of AEGIS® Rings (above) protects the rings from extreme temperatures and humidity.

View Webpages for Manufacturers

Offering Motors with AEGIS® Rings

Factory Installed

Protecting VFD-Driven Motorsfrom Bearing Damage

Download Marathon TEAO Cooling Tower

Motors Brochure

Download LEESON® TEAO Cooling Tower

Motors Brochure

For more information on Marathon Cooling Tower Motors, click here.

LEESON® also offers a line of off-the-shelf cooling tower motors with AEGIS® Rings factory installed. These TEAO motors have full protection from harsh environments and feature cast iron construction with severe-duty treatment of all internal parts. Designed for shaft up mounting, they are available in 10:1 constant and variable torque models from 3 - 250 HP. LEESON® cooling tower motors are made in the USA and come with a 2-year warranty.

For more information on LEESON® Cooling Tower Motors, click here.

All of these motors are ideal for a full range of cooling tower applications including fans, blowers, and pumps and can be used in packaged and field-erected systems. Their air-over design makes them well-suited to applications involving small, tight spaces.

So don’t use just any motor in cooling towers. Insist on motors that are designed and built to survive these brutal environments. And make sure they are equipped with AEGIS® Bearing Protection Rings!

Marathon Cooling Tower Motor with BCP.

LEESON® Cooling Tower Motor.

Congratulations to This Year’s AEGIS® Distributor of the Year Winners

AEGIS® recently announced its 2016 Distributor of the Year winners.

Bartlett Bearing Company once again earned the highest honor, AEGIS® Distributor of the Year. In other categories: John R. Willis Inc. was recognized as HVAC Distributor of the Year, Midpoint Bearing won Best Regional Motor Repair Shop Distributor, and Xview Asia took the award for International Distributor of the Year.

Please join us in congratulating these winners and all of our AEGIS® Distributors for a job well done.

Electro Static Technology31 Winterbrook RoadMechanic Falls, ME 04256

www.est-aegis.comToll-Free: 1-866-738-1857

TEL: (207) 998-5140FAX: (207) 998-5143