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. current , voltage andpower are measured at the MOTOR addition to these TESTS , the DC resistance of the stator winding should bemeasured in order to determine the complete equivalent TestThe slip of the INDUCTION MOTOR at no-load is very low.

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 starting direct on full voltage (b.) the starting torque (c.) the full-load slip (d.) the full-load current (e.) the ratio of starting current to full-load ...

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  Direct, Current, Motor

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