A 480-V, 60 Hz, six-pole synchronous motor draws 80 A from the line at unity power factor and full load.
Assuming that the motor is lossless, answer the following questions:
(a) What is the output torque of this motor? Express the answer both in newton-meters and in pound- feet.
(b) What must be done to change the power factor to 0.8 leading? Explain your answer, using phasor diagrams.
(c) What will the magnitude of the line current be if the power factor is adjusted to 0.8 leading?