A 120-V, 60-Hz, capacitor-run, two-pole, single-phase induction motor has the following parameters: Lmain = 47.2 mH Rmain = 0.38?, Laux = 102 mH Raux = 1.78?, Lr = 2.35?H R r = 17.2??, Lmain, r = 0.342 mH Laux, r = 0.530 mH. You may assume that the motor has 48 W of core loss and 23 W of rotational losses. The motor windings are connected with the polarity shown in Figure with a 40?F run capacitor.

a. Calculate the motor starting torque. With the motor operating at a speed of 3490 r/min, calculate

b. The main and auxiliary-winding currents,

c. The total line current and the motor power factor,

d. The output power and

e. The electrical input power and the efficiency.

Transcribed Image Text:

Main Vyaain winding ell Auxiliary winding aus