10. Two identical 5 kW, 220 V, 24 A dc shunt machines are to be used as the gene- rator and motor in a Ward-Leonard system. The armature resistance of each machine is 0.5 ohm and the magnetization curve for each machine at 1500 rpm is given below: Field current, A Induced emf, V 0.2 80 0.4 0.6 0.8 1.0 1.2 1.4 160 210 228 237 243 247 The generator is driven at a constant speed of 1500 rpm. (a) Determine the maximum and minimum values of the generator field current required to give the motor a speed range of 100 rpm to 1500 rpm at full load armature current of 24 A, with the motor field current held constant at 0.6 A. (b) Determine the maximum motor speed obtainable at full load armature current if the motor field current is reduced to 0.10 A and generator field current is not allowed to exceed 1.2.A.
10. Two identical 5 kW, 220 V, 24 A dc shunt machines are to be used as the gene- rator and motor in a Ward-Leonard system. The armature resistance of each machine is 0.5 ohm and the magnetization curve for each machine at 1500 rpm is given below: Field current, A Induced emf, V 0.2 80 0.4 0.6 0.8 1.0 1.2 1.4 160 210 228 237 243 247 The generator is driven at a constant speed of 1500 rpm. (a) Determine the maximum and minimum values of the generator field current required to give the motor a speed range of 100 rpm to 1500 rpm at full load armature current of 24 A, with the motor field current held constant at 0.6 A. (b) Determine the maximum motor speed obtainable at full load armature current if the motor field current is reduced to 0.10 A and generator field current is not allowed to exceed 1.2.A.
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Transcribed Image Text:10. Two identical 5 kW, 220 V, 24 A dc shunt machines are to be used as the gene-
rator and motor in a Ward-Leonard system. The armature resistance of each
machine is 0.5 ohm and the magnetization curve for each machine at 1500 rpm
is given below:
Field current, A
Induced emf, V
0.2
80
0.4
0.6
0.8
1.0
1.2
1.4
160 210
228
237
243 247
The generator is driven at a constant speed of 1500 rpm.
(a) Determine the maximum and minimum values of the generator field current
required to give the motor a speed range of 100 rpm to 1500 rpm at full load
armature current of 24 A, with the motor field current held constant at 0.6 A.
(b) Determine the maximum motor speed obtainable at full load armature current
if the motor field current is reduced to 0.10 A and generator field current is
not allowed to exceed 1.2.A.
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