A DC shunt motor draws a total current of 100 A and supplied with 500 V. The rated motor speed is 1200 rpm and produce initial torque of 50 N-m. The shunt field resistance is 50 2 and connected to the armature resistance of 0.25 N. The total iron, friction and windage losses of the motor is 2 kW. (i) With proper label, sketch an equivalent circuit of the DC motor. (ii) Calculate the armature current. (iii) Calculate the difference of motor efficiency if the motor operates at no-load and full-load. At which condition the motor efficiency is the highest? Justify your answer.
A DC shunt motor draws a total current of 100 A and supplied with 500 V. The rated motor speed is 1200 rpm and produce initial torque of 50 N-m. The shunt field resistance is 50 2 and connected to the armature resistance of 0.25 N. The total iron, friction and windage losses of the motor is 2 kW. (i) With proper label, sketch an equivalent circuit of the DC motor. (ii) Calculate the armature current. (iii) Calculate the difference of motor efficiency if the motor operates at no-load and full-load. At which condition the motor efficiency is the highest? Justify your answer.
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Transcribed Image Text:(b)
A DC shunt motor draws a total current of 100 A and supplied with 500 V. The rated
motor speed is 1200 rpm and produce initial torque of 50 N-m. The shunt field resistance
is 50 2 and connected to the armature resistance of 0.25 Q. The total iron, friction and
windage losses of the motor is 2 kW.
(i)
With proper label, sketch an equivalent circuit of the DC motor.
(ii)
Calculate the armature current.
(iii)
Calculate the difference of motor efficiency if the motor operates at no-load and
full-load. At which condition the motor efficiency is the highest? Justify your
answer.
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