Contact Us

Electro Static
Technology
An ITW Company
31 Winterbrook Road
Mechanic Falls, ME 04256

United States:
Toll Free: 866.738.1857
Phone: 207-998-5140
Fax: 207.998.5143

Contacts:

Adam Willwerth
Sales/Marketing Manager
207.998.5140
sales@est-aegis.com

John Goodwin
Aegis Sales
sales@est-aegis.com

John Shepherd
Midwest Reg. Sales Mgr.
513.417.1161
jshepherd@est-static.com

Joanne Audet
Marketing Specialist
sales@est-aegis.com

Preventing VFD/AC Drive Induced Electrical Damage to AC Motor Bearings

The use of variable-frequency drives (VFDs) to control AC motors has increased dramatically in recent years. In addition to their low operating cost and high performance, they save energy. Today, the challenge facing system designers and engineers is to minimize damage to AC motors from shaft current. From its first minute of operation, a VFD induces destructive voltages that build up on the motor shaft until they find discharge paths to the frame (ground). In most cases, the motor bearings present the path of least resistance. Once voltage is sufficient to overcome the resistance of the oil film layer in the bearing, shaft current discharges, causing electrical discharge machining (EDM) pits and fusion craters in the race wall and ball bearings. This phenomenon continues until the bearings become so severely pitted that fluting, excessive noise, and failure occur.

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