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Chuck Yung EASA Technical Support Specialist
The procedure for core loss testing of stators is well-defined, but there is not as much information available for special cases like rotors, armatures or high-frequency motors. While the same basic principles apply as for stator testing, frequency is the variable that affects how we should interpret the results.
First, a mini-review is in order. Core losses are comprised of hysteresis and eddy-current losses. Hysteresis losses depend on the grade of steel used and are proportional to the frequency.
Eddy-current losses the edge of each lamination occur at the edge of and vary as the square of the each lamination. frequency. That squared relationship and the fact that they are controlled by the inter-laminar insulation make them critical to the motor’s efficiency. As long as the inter-laminar insulation is viable, these losses are controlled. Shorting of the laminations, whether caused by a rotor drag or from insulation breakdown from excessive burnout temperatures, increases the eddy-current losses. Higher losses result in increased heat and higher magnetizing current.
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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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