Transcription of INDUCTION MOTOR TESTS
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INDUCTION MOTOR TESTS
INDUCTION MOTOR TESTS (No-Load Test, Blocked Rotor Test)The equivalent circuit parameters for an INDUCTION MOTOR can bedetermined using specific TESTS on the MOTOR , just as was done for TestBalanced voltages are applied to the stator terminalsat the rated frequency with the rotor uncoupled fromany mechanical load. Current, voltage and powerare measured at the MOTOR input. The losses in theno-load test are those due to core losses, windinglosses, windage and Rotor TestThe rotor is blocked to prevent rotation andbalanced voltages are applied to the statorterminals at a frequency of 25 percent of therated frequency at a voltage where the ratedcurrent is achieved.
Example (Induction machine performance characteristics) A three-phase, 460 V, 1740 rpm, 60 Hz, four-pole, wound-rotor induction motor has the following equivalent circuit parameters: Rw1 = 0.25S Rw2N = 0.2S Xl1 = Xl2N = 0.5S Xm1 = 30S The rotational losses are 1700W. Determine (a.) the starting current when
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