Compute the required value of external series resistance, Electrical Engineering

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A 200-V dc shunt motor has a field resistance of 200  and an armature resistance of 0.5 . On no load, the machine operates with full field flux at a speed of 1000 r/min with an armature current of 4 A. Neglect magnetic saturation and armature reaction.

(a) If the motor drives a load requiring a torque of 100 N · m, find the armature current and speed of the motor.

(b) If the motor is required to develop 10 hp at 1200 r/min, compute the required value of external series resistance in the field circuit.


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