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November 29, 2009

Mtg: Recent Problems Experienced with Motors and Generator Stator Windings

by @ 7:41 pm. Filed under ALL, Electrical/Power

THURSDAY December 3, 2009
OEB Industry Applications Chapter
Speaker: Greg Stone, Dielectrics Engineer, Iris Power
Time: No-host social at 5:30 PM; Presentation at 6:15 PM; Dinner at 7:15 PM; Presentation continues at 8:00 PM
Cost: $20 for IEEE members; $25 for non-members
Place: Marie Callender’s Restaurant – The Garden Room; 2090 Diamond Blvd, Concord
RSVP: by December 2, by email to Gregg Boltz,, (925) 210-2571

In many respects, large motors and generators in utility and petrochemical plants have become a commodity product with intense competition amongst manufacturers from around the world to secure orders.? This has resulted in intense pressure on machine designers to reduce manufacturing costs.? Some of the methods employed to accomplish this include:
– Reducing the copper cross section
– Reducing the insulation thickness
– Reducing the amount of steel core material.
Each of these methods tends to increase the operating temperature of the stator winding as well as put additional stress on the electrical insulation.? Many design innovations have been successfully implemented.? However, there is both anecdotal and statistical data that indicates that there are more problems with stator windings made in the past 10 years, as compared to machines made before then.
This presentation will outline some of the problems recently seen, including rapid thermal aging, deterioration of the stress relief coatings and end-winding partial discharge problems.? The paper will concentrate on 60 Hz machines, but some examples from modern variable speed drive motors will be also given.? Some ideas for mitigation of risk of experiencing these problems will be suggested.

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