Question: (a) A 250 V (phase), 10 kVA, 3-phase, 50 Hz, 1000 rev/min, star-connected synchronous machine has a synchronous reactance of 500. Stator resistance and

(a) A 250 V (phase), 10 kVA, 3-phase, 50 Hz, 1000 rev/min,

(a) A 250 V (phase), 10 kVA, 3-phase, 50 Hz, 1000 rev/min, star-connected synchronous machine has a synchronous reactance of 500. Stator resistance and rotational losses are both negligible. A field (rotor) current of 5 A is required to produce the rated stator voltage on open circuit. Saturation may be ignored. The machine is used as a motor connected to a 50 Hz, 440 V supply. For a mechanical output power of 10 kW, find the field current necessary to give an input power factor of unity. (b) Find the maximum torque that the motor can supply with the field current value from (a).

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