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Training Film 20: Testing Three-Phase, AC Motors 600 Volts or Less

Publication date: 
June 1987
Type of media: 
Recording duration: 
24 minutes

Outlines the basic steps and procedures commonly used for testing three-phase, AC motors rated 600 volts or less, including preliminary insulation resistance, continuity and no-load tests, as well as the single-phase test for rotors. Also explains how to test components once the motor has been disassembled; these procedures include surge-comparison, polarization index, growler and DC high-potential tests, as well as the “loop” test for stator cores. Additionally, examines performance of final insulation resistance, no-load, vibration and dynamometer tests of repaired or rewound motors.

AC motors
Motor testing