A 200 hp, 230 V, 500 rpm separately excited dc motor is controlled by a chopper. The chopper is connected to a bridge-diode rectifier supplied from a 230 V, 3 phase, 60 Hz ac main.
The motor chopper details are as follows:
Ra= .04 O, La=.0015 H, Kb=4.172 V/rad/sec, fc= 2kHz
The motor is running at 300 rpm with 55 % duty cycle in the chopper. Determine the average current by the method of averaging and the electromagnetic torque produced in the motor.