Morgan Carbon News http://www.morgancarbon.com News & Articles About Morgan Carbon a Global Business Unit of Morgan Crucible plc en Tue, 03 Apr 2007 09:54:08 +0100 http://blogs.law.harvard.edu/tech/rss Jack@sterling-econsultancy.co.uk Jack@sterling-econsultancy.co.uk Engineering 1440 RSSeditor v0.9.54 (http://www.rss-info.com) Success for Morgan-Rekofa http://www.morgancrucible.com/cgi-bin/morgan_news/morgan_news.cgi?database=Morgan Carbon.db&command=viewone&op=t&id=11&rnd=56.113567178184 Morgan Carbon Commutators - Troubles and their Causes http://www.morgancarbon.com/technicalsupport/commutatorstrouble.htm Morgan Carbon Morgan Carbon provides online support with answers to seven common problems with commutator maintenance.

BLACKENING OR BURNING OF COMMUTATOR
The primary cause is abnormally high current resulting in sparking.
BURNING OF FLEXIBLES
The primary cause is persistent unequal current distribution between brushes.
COPPER PICKING
May result either from imperfect contact between commutator and brush, or from abnormal current.
CHATTERING/VIBRATION (or excessive noise)
CHIPPING
CORROSION OF FLEXIBLES BY GAS
FLATS (low bar or bars on commutator)

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The use of variable-speed drives with AC motors induces electrical currents on the motor shaft. Once they exceed the resistance of the bearing lubricant, these currents discharge to ground (typically the motor housing), causing fusion craters in the bearings. Over time, these craters increase in size and number, resulting in frosting, pitting, fluting, and eventually bearing failure. This type of premature bearing failure can cost thousands of dollars in increased maintenance and lost production.

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