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A 50 hp, 250 V, 1200 r/min DC Shunt Motor with an armature resistance of 0.08 Q. Its field circuit has a total resistance (Radj + R) of 100 Q, which produces no-load speed of 1200 r/min. (i) (b) Calculate the motor speeds when the input current at 100A, 200A and 300A.

A 50 hp, 250 V, 1200 r/min DC Shunt Motor with an armature resistance of 0.08 Q. Its field circuit has a total resistance (Radj + R) of 100 Q, which produces no-load speed of 1200 r/min. (i) (b) Calculate the motor speeds when the input current at 100A, 200A and 300A.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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A 50 hp, 250 V, 1200 r/min DC Shunt Motor with an armature resistance of 0.08 N. Its field circuit has a total resistance (Radj + R) of 100 Q, which produces no-load speed of 1200 r/min. (i) (b) Calculate the motor speeds when the input current at 100A, 200A and 300A. (ii) Using the result obtained from Q3(b)(i) plot the torque-speed curve of the motor. (iii) The motor in Q3(b) is now connected separately excited. The motor is initially running VA = 250 V, I = 120 A and n= 1103 r/min, while supplying a constant torque load. Determine the speed of this motor be if V is reduced to 200 V.
Transcribed Image Text:A 50 hp, 250 V, 1200 r/min DC Shunt Motor with an armature resistance of 0.08 N. Its field circuit has a total resistance (Radj + R) of 100 Q, which produces no-load speed of 1200 r/min. (i) (b) Calculate the motor speeds when the input current at 100A, 200A and 300A. (ii) Using the result obtained from Q3(b)(i) plot the torque-speed curve of the motor. (iii) The motor in Q3(b) is now connected separately excited. The motor is initially running VA = 250 V, I = 120 A and n= 1103 r/min, while supplying a constant torque load. Determine the speed of this motor be if V is reduced to 200 V.
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