1) A 6 pole, 240V, 3 phase, wye-connected 60 Hz, 15 hp induction motor has the following per-phase equivalent circuit parameters (in ohms) referred to the stator:
R1= 0.2, R2= 0.15, X1= 0.6, X2= 0.3, Xm= 20. The total friction, windage, and core loss is constant at 350 W, independent of load. Under a certain load condition (at the rated voltage and frequency) the slip is 0.03. Calculate:
(a)The input current magnitude
(b) the power factor
(c) the speed in rpm
(d) the output power delievered to the load
2) Usingthe same motor as problem 1, determine the following under starting conditions if ws=0 at 60Hz. Assume the windage, friction, and core loss are all zero.
(a)The line voltage (magnitude) required to limit the starting current(input) to 60A
(b)Find the starting toque(Nm) for this case.