Question

A 25 hp, 500 V, 1200 rpm separately excited DC motor is controlled by a three-phase full converter. The field current is also controlled by a three-phase full converter. The AC input to the armature and field converters is three-phase, Y-connected, 208 V-60 Hz. The armature resistance is Ra = 0.1 ohms, the field circuit resistance is Rf = 140 ohms, and the motor voltage constant is Kv = 1.1 V/A rad-1. Electrical, viscous friction, and no-load losses are negligible. The armature and field currents are continuous and ripple-free. The field circuit converter is set to the maximum field current, the developed torque is Td = 120 N-m, and the delay angle of the armature converter is 0 degrees. The input power factor would be equal to: a. 0.61 lagging b. 0.78 lagging c. 0.95 lagging d. 0.95 leading

          A 25 hp, 500 V, 1200 rpm separately excited DC motor is controlled by a three-phase full converter. The field current is also controlled by a three-phase full converter. The AC input to the armature and field converters is three-phase, Y-connected, 208 V-60 Hz. The armature resistance is Ra = 0.1 ohms, the field circuit resistance is Rf = 140 ohms, and the motor voltage constant is Kv = 1.1 V/A rad-1. Electrical, viscous friction, and no-load losses are negligible. The armature and field currents are continuous and ripple-free. The field circuit converter is set to the maximum field current, the developed torque is Td = 120 N-m, and the delay angle of the armature converter is 0 degrees. The input power factor would be equal to:
a. 0.61 lagging
b. 0.78 lagging
c. 0.95 lagging
d. 0.95 leading

a 25 hp 500 v 1200 rpm separately excited dc motor is controlled by a three phase full converter the field current is also controlled by a three phase full converter the ac input to armature 05937

Added by Tom-S D.

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