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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)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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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.
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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