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 N, 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, IA = 120 A and n= 1103 r/min, while supplying a constant torque load. Determine the speed of this motor be if VA is reduced to 200 V.
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 N, 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, IA = 120 A and n= 1103 r/min, while supplying a constant torque load. Determine the speed of this motor be if VA is reduced to 200 V.
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Transcribed Image Text: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.
(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, IĄ = 120 A and n= 1103 r/min, while supplying a constant
torque load. Determine the speed of this motor be if Va is reduced to 200 V.
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