Question

d) Find the voltage regulation and officiency tof all the cases in part part (c) above. (e) above. 2. (25) A three-phase, 12 HP, 220 V, 60 Hz, Y connected induction motor is running at 1728 rpm while delivering rated torque. The induction motor has the following equivalent circuit model parameters: R1-0.1 Ω, X1-040 R2-0.16Ω, X2 1Ω, and XM Ignore core losses. 20 Ω Find: (Hint: Reasonable engineering approximations are encouraged.) a) The shaft torque. b) The motor efficiency. Hint: What are the input and output powers? c) Mechanical losses, Pmech Pwf+ Pmisc d) The rotor speed in rpm at pullout torque. e) The pullout torque. h) The starting current and torque.

Answer 1

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