A 500 V dc shunt motor has an armature resistance of Ra = 0.25 2 and field circuit resistance of R 240 . The motor drives a mechanical load, which requires a torque proportional to speed. When the motor-load system is connected to a 500 V supply, it takes 100 A and rotates at 1100 rpm. The speed is to be reduced to 900 rpm by inserting a resistance in series with the armature The field current is kept the same. Determine the value of the added series resistance.
A 500 V dc shunt motor has an armature resistance of Ra = 0.25 2 and field circuit resistance of R 240 . The motor drives a mechanical load, which requires a torque proportional to speed. When the motor-load system is connected to a 500 V supply, it takes 100 A and rotates at 1100 rpm. The speed is to be reduced to 900 rpm by inserting a resistance in series with the armature The field current is kept the same. Determine the value of the added series resistance.
Introductory Circuit Analysis (13th Edition)
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Transcribed Image Text:A 500 V dc shunt motor has an armature resistance of Ra = 0.25 2 and field circuit resistance
of R 240 . The motor drives a mechanical load, which requires a torque proportional
to speed. When the motor-load system is connected to a 500 V supply, it takes 100 A and rotates
at 1100 rpm.
The speed is to be reduced to 900 rpm by inserting a resistance in series with the armature
The field current is kept the same.
Determine the value of the added series resistance.
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