A 300 V, dc separately excited motor drives a conveyor belt (constant torque). The armature resistance of the motor is 1 ?. When the conveyor belt is loaded at 150 Nm, the motor speed is 800 rpm. The field constant K? of the motor is always greater than 2 Vs. The motor is controlled by a full-wave, ac/dc converter, where the voltage on the ac side is 480 V (rms). At 150 Nm, the triggering angle is adjusted so that the speed of the motor is 400 rpm. The armature current of the motor is continuous. Calculate the triggering angle and the average terminal voltage of the motor.
What will be an ideal response?
Assume that subscript 1 denotes the case when n = 800 rpm, and subscript 2
denotes the case when n = 400 rpm.
Because the motor is controlled by adjusting the triggering angle and it is a
separately excited motor drives, K? is a constant.
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