Example : A 250 V, D.C shunt motor has a shunt field resistance of 250 an armature resistance of 0.25 Q. It runs at 1500 r.p.m, drawing an armature cu of 20 A. If a resistance of 250 Q is inserted in series with the field, the load to remaining the same and ( T á ØI,). Find out the new speed and armature curr N2 Ep2 Ø, N, 02 Since we have shunt motor, it means that the flux is directly proportional to

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Author:Robert L. Boylestad
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Example : A 250 V, D.C shunt motor has a shunt field resistance of 250 Q and
armature resistance of 0.25 Q. It runs at 1500 r.p.m,
drawing an armature cur
of 20 A. If a resistance of 250 Q is inserted in series with the field, the load tore
remaining the same and (T á Ø1,). Find out the new speed and armature curren
N2
Since we have shunt motor, it means that the flux is directly proportional to fi
current.
N 2
E b2
E bl
Load torque remain the same
N1
I 12
T, =T,
T, á 0,1
and T,á 0,12
Transcribed Image Text:Example : A 250 V, D.C shunt motor has a shunt field resistance of 250 Q and armature resistance of 0.25 Q. It runs at 1500 r.p.m, drawing an armature cur of 20 A. If a resistance of 250 Q is inserted in series with the field, the load tore remaining the same and (T á Ø1,). Find out the new speed and armature curren N2 Since we have shunt motor, it means that the flux is directly proportional to fi current. N 2 E b2 E bl Load torque remain the same N1 I 12 T, =T, T, á 0,1 and T,á 0,12
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