NDLI: A New Method for Stator Core Repair Reduces Core Losses and Repair Time

Content Provider	IEEE Xplore Digital Library
Author	Yung, C.
Copyright Year	2006
Description	Author affiliation: Electr. Apparatus Service Assoc., Inc., St. Louis, MO (Yung, C.)
Abstract	The steel laminations used in the stator core of electric motors and generators are electrically insulated from one another to reduce eddy-current losses. When a bearing failure results in friction between the rotor and stator, or a ground fault occurs, laminations are often fused together. Since traditional methods of core repair are labor-intensive, even moderate core damage may preclude economical repair in the few percent of motor failures with significant core damage. There is a new process that can restore the coreplate without dismantling the core, saving labor and eliminating the chance of unsatisfactory restack results. This chemical conversion process simultaneously etches interlaminar shorts and forms a durable coreplate with excellent electrical insulation. The potential benefits to industry, in terms of labor saved and reduced mean time to repair, are substantial. The cost to restack the stator core of a 5,000 kW machine can exceed $30,000 US, and require two weeks time. This new process can restore the core in less than one day
Starting Page	1
Ending Page	10
File Size	9647054
Page Count	10
File Format	PDF
ISBN	1424405580
ISSN	00903507
DOI	10.1109/PCICON.2006.359698
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-11
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stator cores Core loss Lamination Dielectrics and electrical insulation Steel Electric motors Friction Rotors Chemical processes Etching Core test Coreplate
Content Type	Text
Resource Type	Article
Subject	Fuel Technology Energy Engineering and Power Technology

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