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Usual & Unusual Service Conditions for Motors and Generators

  • September 2020
  • Number of views: 146
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Tom Bishop. P.E.
EASA Senior Technical Support Specialist

What are the normal conditions for which a motor is designed? This is a question that does not often come up except when there is an issue with a motor application.   

The NEMA MG1 motor and generator standards provide details on this subject by defining usual and unusual service conditions. The IEC 60034-1 standard, “Rotating Electrical Machines, Part 1 Ratings and Performance,” also addresses some application conditions in clause 6, though not to the extent given in MG1. Our focus here will be on MG1 since it provides greater detail than IEC 60034-1.

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