Method and system for reducing bearing fluting in...

Electrical generator or motor structure – Dynamoelectric – Rotary

Reexamination Certificate

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C482S051000, C198S952000

Reexamination Certificate

active

07071589

ABSTRACT:
A non-conductive insulating ring (210) is inserted between a motor bell (130) and a motor bearing (135) that supports a motor shaft (110). Stray currents that normally discharge thorough the motor shaft and the motor bearing to the motor bell are prevented due to the non-conductive nature of the insulating ring. Additionally, the motor shaft is grounded to provide a low-impedance alternative path to stray shaft currents. When a fast-switching frequency converter is used to drive the motor shaft, additional arrangements such as a common mode choke, reduction of the switching frequency of the converter, and reduction of the turn-of/off rate of a semiconductor device used in the converter, may be provided to further reduce the stray currents flowing thorough the motor bearings.

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The Boyanton Paper: “Bearing Damage Due to Electrical Discharge” by Hugh Boyanton, Vice President of Shaft Grounding Systems, Inc. (Printed from http://www.teleport.com/˜sgsi/paper1.html (26 pp.).
Busse, D. et al.; (Allen Bradley Drives Division, Mequon, WI); “Bearing Currents and Their Relationship to PWM Drives,” IEEE IECON Conference, Orlando, FL Nov. 1995.

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