Test rig for induction motor quasi-static electromechanical characteristic determination

The paper presents a test rig for the determination of the quasi-static electromechanical characteristics of induction motors supplied with sinusoidal voltages. The paper describes in detail the test rig, the used instrumentation, and the characterization tests that can be performed on it. The motor under test is driven by another speed-controlled motor needing a particular attention from the control point of view. The `on-line´ nature of the proposed measurement technique is made possible both by the high dynamic of the electric drive, and the high sampling rate, precision, and accurate synchronization features of the used data-recorder and acquisition system. Examples of quasi-static electromechanical characteristics obtained with the proposed test rig are reported for a 1.5 kW three-phase induction motor and a 0.75 kW permanent-split capacitor-run single phase induction motor.