Q3:A: The nameplate rating of a shunt motor is 150 hp, 600 volts, 205 amp, 1,700 rpm. The resistance of the shunt field circuit is 240 ohms, and the total armature circuit resistance is 0.15 ohm. The motor has a commutating winding, and armature reaction is neglected. (a) Calculate the full-load efficiency of the motor and the speed regulation. (b) Calculate the efficiency and the delivered torque when the motor draws half-load current from the line. (c) If the motor is to deliver full-load torque at 1,200 rpm, what value of resistance must be added to the armature circuit ?

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ISBN:9780133923605
Author:Robert L. Boylestad
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Q3:A: The nameplate rating of a shunt motor is 150 hp, 600
volts, 205 amp, 1,700 rpm. The resistance of the shunt field circuit is
240 ohms, and the total armature circuit resistance is 0.15 ohm. The
motor has a commutating winding, and armature reaction is
neglected. (a) Calculate the full-load efficiency of the motor and
the speed regulation. (b) Calculate the efficiency and the delivered
torque when the motor draws half-load current from the line. (c) If
the motor is to deliver full-load torque at 1,200 rpm, what value of
resistance must be added to the armature circuit ?
Transcribed Image Text:Q3:A: The nameplate rating of a shunt motor is 150 hp, 600 volts, 205 amp, 1,700 rpm. The resistance of the shunt field circuit is 240 ohms, and the total armature circuit resistance is 0.15 ohm. The motor has a commutating winding, and armature reaction is neglected. (a) Calculate the full-load efficiency of the motor and the speed regulation. (b) Calculate the efficiency and the delivered torque when the motor draws half-load current from the line. (c) If the motor is to deliver full-load torque at 1,200 rpm, what value of resistance must be added to the armature circuit ?
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