a. A 4-pole, 50 Hz, 440 V, 85 kW, 3-phase star-connected synchronous motor has resistance and synchronous reactance per phase of 0.05 ohm and 0.5 ohms respectively. Assume the efficiency of the synchronous motor is 92.5 percent and a full load power factor of 0.8 leading. Compute for the, armature current, back emf per phase, total copper loss, mechanical power developed, and torque. b. A three-phase, delta-connected synchronous motor has an excitation of 425 volts. The resistance and synchronous reactance per phase is 0.4 ohms and 5 ohms respectively. The induced emf is 530 volts. Calculate power output, line current, power factor; and efficiency for maximum power output if the friction and iron losses are constant at 1200 watts. Please show HANDWRITTEN solutions.
a. A 4-pole, 50 Hz, 440 V, 85 kW, 3-phase star-connected synchronous motor has resistance and synchronous reactance per phase of 0.05 ohm and 0.5 ohms respectively. Assume the efficiency of the synchronous motor is 92.5 percent and a full load power factor of 0.8 leading. Compute for the, armature current, back emf per phase, total copper loss,
b. A three-phase, delta-connected synchronous motor has an excitation of 425 volts. The resistance and synchronous reactance per phase is 0.4 ohms and 5 ohms respectively. The induced emf is 530 volts. Calculate power output, line current, power factor; and efficiency for maximum power output if the friction and iron losses are constant at 1200 watts.
Please show HANDWRITTEN solutions.
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