A 3-phase, 6-pole, 50-Hz, 500 kVA , 6600 V, star-connected synchronous motor has a synchronous impedance of j80 ohms per phase.
1. A 3-phase, 6-pole, 50-Hz, 500 kVA , 6600 V, star-connected synchronous motor has a synchronous impedance of j80 ohms per phase. For unity power factor :
(i) Determine the mechanical torque neglecting all machine losses
(ii) If this torque can be assumed constant, what would be the motor back emf and load angle for (a) 0.9 power factor lag and (b) 0.9 power factor lead?
(iii) How will the maximum torque be affected in both cases?
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A 3-phase, 6-pole, 50-Hz, 500 kVA , 6600 V, star-connected synchronous motor has a synchronous impedance of j80 ohms per phase.
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