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9. A variable-speed drive system uses a d.c. motor which is supplied from a variable voltage source. The torque and power profiles are shown in Fig, 11.7. The drive speed is varied from 0 to 1750 rpm (base-speed) by varying the terminal voltage (from 0 to 600V) with the field current maintained constant, (a) Determine the motor armature current if the torque is held constant at 250 Nm up to the base-speed. (b) The speed beyond the base-speed is obtained by field weakening while the armature voltage is held constant at 600 V. Determine the torque available at a speed of 2500 rpm if the armature current is held constant at the value obtained in part (a). Neglect all losses. [Ans: (a) 76.35 A, (b) 175 Nm]

9. A variable-speed drive system uses a d.c. motor which is supplied from a variable voltage source. The torque and power profiles are shown in Fig, 11.7. The drive speed is varied from 0 to 1750 rpm (base-speed) by varying the terminal voltage (from 0 to 600V) with the field current maintained constant, (a) Determine the motor armature current if the torque is held constant at 250 Nm up to the base-speed. (b) The speed beyond the base-speed is obtained by field weakening while the armature voltage is held constant at 600 V. Determine the torque available at a speed of 2500 rpm if the armature current is held constant at the value obtained in part (a). Neglect all losses. [Ans: (a) 76.35 A, (b) 175 Nm]

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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9. A variable-speed drive system uses a d.c. motor which is supplied from a variable voltage source. The torque and power profiles are shown in Fig, 11.7. The drive speed is varied from 0 to 1750 rpm (base-speed) by varying the terminal voltage (from 0 to 600V) with the field current maintained constant, (a) Determine the motor armature current if the torque is held constant at 250 Nm up to the base-speed. (b) The speed beyond the base-speed is obtained by field weakening while the armature voltage is held constant at 600 V. Determine the torque available at a speed of 2500 rpm if the armature current is held constant at the value obtained in part (a). Neglect all losses. [Ans: (a) 76.35 A, (b) 175 Nm]
Transcribed Image Text:9. A variable-speed drive system uses a d.c. motor which is supplied from a variable voltage source. The torque and power profiles are shown in Fig, 11.7. The drive speed is varied from 0 to 1750 rpm (base-speed) by varying the terminal voltage (from 0 to 600V) with the field current maintained constant, (a) Determine the motor armature current if the torque is held constant at 250 Nm up to the base-speed. (b) The speed beyond the base-speed is obtained by field weakening while the armature voltage is held constant at 600 V. Determine the torque available at a speed of 2500 rpm if the armature current is held constant at the value obtained in part (a). Neglect all losses. [Ans: (a) 76.35 A, (b) 175 Nm]
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