ASSIGNMENT 1. Why does the rotor rotate? Discuss the re

ASSIGNMENT 1. Why does the rotor rotate? Discuss the reasons in your explanation. 2. A 3-phase 460V 4-pole Y-connected induction motor has below parameters: Rs = 1.5ohm Rr = 0.75ohm Xs = 1.5ohm Xr = 2.25ohm and Xm = 65ohm. The no-load loss Pno-load is negligible. The load torque is proportional to the speed squared is 45Nm at 1740rpm. If the motor speed is 1550rpmdetermine : a) Load torque tL b) The rotor current IR c) Stator supply voltage Va d) Motor input current Ii e) Motor input power Pi f) The slip for maximum current sa g) Maximum rotor current Ir(max) h) Speed at maximum rotor current ?a i) Torque at maximum current t a 3. A 440V 3-phase 50Hz 4 pole Y-connected induction motor has a full load speed of 1425 rpm. The rotor has an impedance of (0.4+j4) ohm and rotor/stator turn ratio of 0.8. Calculate : a) Full load torque b) Rotor current and full load rotor Cu loss c) Power output if windage and friction losses amount to 500W d) Maximum torque and the speed at which it occurs e) Starting current and starting torque
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