A 400 V, 50 Hz, 6-pole, 940 rpm, star connected induction motor has the following parameters: stator and rotor resistanc

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A 400 V 50 Hz 6 Pole 940 Rpm Star Connected Induction Motor Has The Following Parameters Stator And Rotor Resistanc 1 (48.81 KiB) Viewed 31 times

A 400 V, 50 Hz, 6-pole, 940 rpm, star connected induction motor has the following parameters: stator and rotor resistances are 1.25 each, and stator and rotor leakage reactance are 2 each (magnetising reactance can be neglected). The motor is controlled by simultaneous stator voltage and frequency variation. Voltage boost is not used and the motor is controlled using V/f = constant law. The motor is supplied from a three-phase voltage source inverter b) For the same 25 Hz operating frequency, calculate ratio of the starting current at this frequency with respect to the starting current at rated frequency [5 marks] Starting current ratio is: Number