DC series motor, having an the armature resistance of 0.1 ohm and field resistance of 0.05 ohm, takes 80A at 250V and 650 rpm. 1-If the iron and frictional loss are 100 W, calculate the developed torque and efficiency. 2-If an external resistance of 1 ohm is inserted in series with motor; calculate the new steady state armature current and the speed. Assume the torque is proportional to the square of speed.

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DC series motor, having an the armature resistance of 0.1 ohm and field

resistance of 0.05 ohm, takes 80A at 250V and 650 rpm.

1-If the iron and frictional loss are 100 W, calculate the developed torque and

efficiency.

2-If an external resistance of 1 ohm is inserted in series with motor; calculate the

new steady state armature current and the speed. Assume the torque is

proportional to the square of speed.

 

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