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EASA Technical Support Specialist
Did you ever wonder if the preheating instructions from solvent varnish and solventless resin (hereafter we’ll use the term “resin” when it applies to both) manufacturers were really all that important? The short answer is, yes, they are. Here we’ll expand on some of the reasons that preheating is a key step in the winding process.
One of the first benefits of preheating is that it drives out moisture that may have settled on surfaces, or been absorbed by insulation material. A little known aspect of preheating is that it relieves the mechanical stress cracks, termed “crazing,” on the magnet wire insulation coating that occur during coil winding and insertion. Epoxy B-stage materials can be set by preheating, provided the preheating time and temperature meet the epoxy’s curing requirements. Random windings typically don’t use many B-stage materials; however, many of the lacing products for endturns are thermosetting. Form coil windings often have B-stage surge ropes, and some felt packings used for endturn coil bracing are B-stage epoxy loaded.
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This 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.
This booklet covers topics such as:
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The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.
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Recommended Practice for the Repair of Rotating Electrical Apparatus
This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.
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Revised May 2021
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.
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