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Electro Static Technology: Motor Shaft Grounding Ring

July 30, 2007
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The Aegis SGR™ Conductive MicroFiber™ shaft grounding ring protects bearings from electrical damage, thereby extending motor life and preventing bearing noise, downtime, and motor repairs/replacements. According to the manufacturer, the shaft grinding ring is ideal for predictive and preventive maintenance programs on variable-frequency drive (VFD)-controlled ac motors and large dc motors. When used to control the speed of an ac motor, a VFD induces currents on the motor shaft that discharge through bearings. This causes fusion craters on bearing race walls. In time it can lead to noise, vibration, bearing failure, and catastrophic motor failure. The Aegis SGR prevents bearing damage by channeling shaft currents to ground. Conductive microfibers inside the SGR provide the path of least resistance, allowing these shaft currents to discharge safely to the motor frame.

Electro Static Technology, 31 Winterbrook Rd., Mechanic Falls, ME 04256; 866-738-1857 or 207-998-5140; 207-998-5143 (fax); sales@est-aegis.com; www.est-aegis.com

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