4. A 380-V, 60 Hz, 150-hp 0.8-PF-lagging six-pole Y-connected synchronous motor has a synchronous reactance of 1.1 2 and

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4 A 380 V 60 Hz 150 Hp 0 8 Pf Lagging Six Pole Y Connected Synchronous Motor Has A Synchronous Reactance Of 1 1 2 And 1 (98.19 KiB) Viewed 36 times

4. A 380-V, 60 Hz, 150-hp 0.8-PF-lagging six-pole Y-connected synchronous motor has a synchronous reactance of 1.1 2 and negligible armature resistance. Ignore its friction, windage, and core losses. (a) If this motor is initially supplying 150-hp at 0.8 PF lagging, what are the magnitudes and angles of excitation voltage and stator current? Draw the phasor diagram for this condition. (9%) (b) Determine the maximum torque that the motor can deliver. (6%) (c) If the field excitation current is now increased by 15% (without changing the prime mover power), find the stator current, and power factor. (6%)