A separately excited DC motor has the following data P=32kW (rated power); Va=220V (rated voltage); Ia=171A...
A separately excited DC motor has the following data
P=32kW (rated power); Va=220V (rated voltage); Ia=171A (rated curent); n=1000 rpm (rated speed); Ra = 0.096 ohm
a.Calculate the armature voltage to reduce the speed to 900 rpm, assuming the load torque is kept constant?
b.Calculate the resistance should be added to armature circuit to reduce the speed to 800 rpm, assuming the load torque is kept constant?
c.Calculate the reduction of magnetic flux to reach the speed of 1100 rpm, assuming the load torque is kept constant?
d.Calculate the armature voltage to reduce the speed to 900 rpm, assuming the load torque is 90% rated torque?
e.Calculate the resistance should be added to armature circuit to reduce the speed to 800 rpm, assuming the load torque is 90% rated torque?
f.Calculate the reduction of magnetic flux to reach the speed of 1100 rpm, assuming the load torque is 90% rated torque?
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