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New Grounding Coupling Prevents Shaft Current from Damaging AC Motor...

February 2, 2005 -- The revolutionary new Aegis Shaft Grounding Coupling (SGC) from Electro Static Technology prevents electrical damage to bearings of AC motors by safely passing harmful shaft current to ground. Extremely effective yet low-cost, the Aegis coupling provides an ultra-low impedance path from shaft to frame, allowing current induced by variable frequency drives (VFDs) to pass to ground without damaging motor bearings or the bearing race.



When variable frequency drives are used with AC motors, current is induced along the motor shaft. When it overcomes the resistance of the grease, this current discharges through the motor bearings causing frosting, pitting, fluting, and fusion craters which can lead to premature motor failure. With its patent-pending Electron Transport Technology, the Aegis coupling solves this problem by providing a "virtual short" between the shaft and motor frame that keeps shaft current and voltage from building up in the first place. Easily installed and maintenance free, the Aegis coupling is a reliable, low-cost alternative to less effective mitigation schemes such as brushes.



In addition to eliminating damaging shaft current, the Aegis SGC provides cleanroom-quality bearing isolation with a dustproof seal that also protects against water spray. Developed initially for 5 to 15 HP NEMA motors (the largest installed base of motor/drive applications), the Aegis SGC is ideal for HVAC, cleanroom, petrochemical, manufacturing, transportation, and other applications where VFDs are used. Additional sizes will be available in the immediate future.



Electro Static Technology is a global leader in the elimination and/or mitigation of induced electrical charges. Other products include FLX-P flexible peel-and-stick passive static eliminators for printers, copiers, and other imaging devices. Electro Static Technology is a division of Illinois Tool Works (ITW), a $10 billion multinational conglomerate operating in 44 countries.



For more information, contact: Adam Willwerth, Sales and Marketing Manager, Electro Static Technology, 31 Winterbrook Road, Mechanic Falls, ME 04256, Toll-Free: 1-866-738-1857, TEL: (207) 998-3493, FAX: (207) 998-5143, e-mail protected from spam bots, www.est-aegis.com.

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