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Chuck Yung EASA Technical Support Specialist
A good friend recently reminded me of a tip that can save you a lot of trouble when repairing motors with an aluminum frame: Never hot-dip a stator with an aluminum frame.
In the bake oven, the aluminum frame expands faster than the encased steel stator core. The core is loose inside the aluminum frame and, if dipped hot, varnish seeps into the gap and cures.
That destroys the concentricity between the stator bore and the bracket fits. The critical airgap between the stator bore and rotor becomes eccentric, and the rotor might even drag on the stator bore. Even if it does not rub, the eccentric airgap is likely to cause electrical noise when the motor runs.
That reminded me of other valuable tips worth sharing. So that is what this article is about: Tips to help you do your job faster with less effort and to avoid mistakes; and a few that you could classify as opportunities to improve a customer’s motors.
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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 September 2022 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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