A 1100-V, 50-Hz delta-connected induction motor has a star-connected slip-ring rotor with a phase transformation ratio
Posted: Tue Apr 12, 2022 10:12 am
A 1100-V, 50-Hz delta-connected induction motor has a star-connected slip-ring rotor with a
phase transformation ratio of 3.8. The rotor resistance and standstill leakage reactance are
0.012 ohm and 0.25 ohm per phase respectively. Neglecting stator impedance and
magnetising current determine:
1.1 The rotor current at start with slip-ring shorted (6)
1.2 The rotor power factor at start with slip-rings shorted (3)
1.3 The rotor current at 4% slip with slip-rings shorted (8)
1.4 The rotor power factor at 4% slip with slip-rings shorted (3)
phase transformation ratio of 3.8. The rotor resistance and standstill leakage reactance are
0.012 ohm and 0.25 ohm per phase respectively. Neglecting stator impedance and
magnetising current determine:
1.1 The rotor current at start with slip-ring shorted (6)
1.2 The rotor power factor at start with slip-rings shorted (3)
1.3 The rotor current at 4% slip with slip-rings shorted (8)
1.4 The rotor power factor at 4% slip with slip-rings shorted (3)