A 1100-V, 50-Hz, 4 pole delta-connected induction motor has a star-connected slip- ring rotor with a...

 

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A 1100-V, 50-Hz, 4 pole delta-connected induction motor has a star-connected slip- ring rotor with a phase turns ratio of 3.8:1. The rotor resistance and standstill leakage reactance are 0.012 2 and 0.25 92 per phase respectively. Neglecting stator impedance and magnetising current, calculate the following: Rotor current and power factor at start with slip-rings shorted i) ii) iii) iv) Starting torque (8 marks) Running torque (5 marks) Rotor current and power factor at 4% slip with slip-rings shorted (7 marks) (3 marks) A 1100-V, 50-Hz, 4 pole delta-connected induction motor has a star-connected slip- ring rotor with a phase turns ratio of 3.8:1. The rotor resistance and standstill leakage reactance are 0.012 2 and 0.25 92 per phase respectively. Neglecting stator impedance and magnetising current, calculate the following: Rotor current and power factor at start with slip-rings shorted i) ii) iii) iv) Starting torque (8 marks) Running torque (5 marks) Rotor current and power factor at 4% slip with slip-rings shorted (7 marks) (3 marks)

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To solve this problem we need to use the given information about the induction motor and the sliprin... View the full answer