Method and system for reducing bearing fluting in electromechanical machine
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United States of America Patent
Stats
-
Jul 4, 2006
Grant Date -
May 8, 2003
app pub date -
Jun 19, 2002
filing date -
Nov 6, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
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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