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Tyler Voss Membership & Communications Specialist+1 314 993 2220tvoss@easa.com
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Mike Howell, PE EASA Technical Support Specialist
The phase balance test is briefly described in section 4.2.8 of ANSI/EASA AR100-2020. Other names for this test include open stator impedance test, ball test, small rotor test and dummy rotor test. The phase balance test is used in some form by many service centers both as a troubleshooting test and a quality control check before winding treatment. The typical approach is to apply a reduced and balanced three-phase voltage to the stator winding terminals with the rotor removed and then to evaluate the resulting current balance and magnitude. Acceptance criteria differ, but it is a reasonable expectation that the current should be balanced within 10% of the average 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.
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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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