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Chuck Yung EASA Technical Support Specialist
Have you ever wondered how a lightning rod works? That small rod atop a large building extends less than a yard (meter) above the building. Yet the lightning is attracted to that sacrificial rod rather than to the building. If you have not wondered about lightning rods, I'll bet you are curious about what lightning rods could possibly have to do with electric motors.
The common denominator between electrical windings and lightning rods is geometry. Lightning strikes the lightning rod because the voltage stresses are higher between the pointed rod and the cloud than between that same cloud and the building. The pointed shape raises the potential voltage stress at the end of the lightning rod. For the same reason, we often see winding failures affected by the geometry of a coil, a connection, or a sharp corner within a stator frame.
When the subject of voltage stress comes up, many people assume that the voltage stress does not exceed the line voltage of the winding. Our early assumptions were that voltage stresses followed a linear pattern and could simply be calculated by the relationship of circuits, coils and turns per coil.
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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 2024 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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