A 480 V, four-pole, 60 Hz, Y-connected induction motor has a stator inductive reactance of 4 ? and stator resistance of 0.2 ?. The rotor inductive reactance and resistance referred to the stator are 4 ? and 0.2 ?, respectively. The magnetizing reactance is 150 ? in the linear region and 50 ? in the saturation region. The motor is driving a constant-torque load of 120 Nm and is driven by a CSI. The frequency of the CSI is adjustable. Calculate the frequency of the CSI for the needed speed (900 rpm) without exceeding the ratings of the motor, and compute the starting torque.
What will be an ideal response?
Assuming the rated power factor is 0.7 and ignoring the stator losses, the rated
current is:
If the current is limited to the rated value, we can assume that the machine is
operating in the linear region of the magnetizing curve. If the needed speed is 900
rpm, then the frequency of the CSI is:
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