EEC 309 ELECTRICAL MACHINES 2 Examen 2024

Extrait du sujet

1. The power input to a 500 V, 50 Hz, 6 pole, 3 phase induction motor running at 975 rev/min is 40 kW. The stator losses are 1 kW and friction and winding losses total 2 kW. Calculate: the slip, rotor copper losses, shaft power, and efficiency. (5 × 4) marks

2. A 3 phase, 100 hp, 60 Hz 480 V, four pole, wye connected cylindrical rotor synchronous motor has an armature resistance of 0.15 Ω and a synchronous reactance of 2 Ω per phase respectively. Determine the following a) The internal generated voltage (10 marks) b) The torque angle δ (1 mark) c) The maximum torque (4 marks)