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Tyler Voss Membership & Communications Specialist+1 314 993 2220tvoss@easa.com
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Jim Bryan EASA Technical Support Specialist (retired)
There are many misconceptions about Service Factor (SF) in the industry. Some feel it is meant for temporary excursions into overload conditions; others consider it to be an allowance for permanent overload. The truth is that it is neither. As defined in the EASA Technical Manual and NEMA MG1, the definition of service factor is:
"A multiplier which, when applied to rated power, indicates a permissible power loading that may be carried under the conditions specified for the service factor."
The NEMA MG1-2011 theory of SF says that a motor is thermally capable of overload to that point within the insulation class at normal service conditions.
Since any increase in load increases the current, this overload will increase the operating temperature of the motor. For every increase of 10ºC, the motor winding expected life is reduced by one-half. It does not matter what the source of that increase in temperature is; overload, poor ventilation, low voltage or high ambient temperature are just a few.
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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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