A 230 V DC shunt motor has a full-load efficiency of 89.9%. Rated (full) load is 40 hp. Motor losses, expressed as a percentage of output power are as follows: rotational losses - 3.7%; armature copper loss - 3.9%; and, field copper loss - 2.5%. Stray load losses can be neglected. At full load, the motor speed is 1150 rpm. Neatly sketch an equivalent circuit for the DC shunt motor, and determine: the field current; the armature current at full load; the armature current at half load; the armature current at no load; and, the shaft torque at full load. 18 a. نه ن ن م نه b. C. d.
A 230 V DC shunt motor has a full-load efficiency of 89.9%. Rated (full) load is 40 hp. Motor losses, expressed as a percentage of output power are as follows: rotational losses - 3.7%; armature copper loss - 3.9%; and, field copper loss - 2.5%. Stray load losses can be neglected. At full load, the motor speed is 1150 rpm. Neatly sketch an equivalent circuit for the DC shunt motor, and determine: the field current; the armature current at full load; the armature current at half load; the armature current at no load; and, the shaft torque at full load. 18 a. نه ن ن م نه b. C. d.
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Transcribed Image Text:A 230 V DC shunt motor has a full-load efficiency of 89.9%. Rated (full) load is 40 hp.
Motor losses, expressed as a percentage of output power are as follows: rotational losses -
3.7%; armature copper loss - 3.9%; and, field copper loss - 2.5%. Stray load losses can be
neglected. At full load, the motor speed is 1150 rpm. Neatly sketch an equivalent circuit
for the DC shunt motor, and determine:
the field current;
the armature current at full load;
the armature current at half load;
the armature current at no load; and,
the shaft torque at full load.
18
نه ن ن م نے
a.
b.
C.
d.
e.
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