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The speed of a 20-hp, 300-V, 1800-rpm separately excited dc motor is controlled by a three-phase full-converter drive. The field current is also controlled by a three-phase full converter and is set to the maximum possible value. The ac input is a three-phase, Y-connected, 208-V, 60-Hz supply. The armature resistance is Ra = 0.25 0, the field resistance is R = 245 0, and the motor voltage constant is K, = 1.2 VIA rad/s. The armature and field currents can be assumed to be continuous and ripple free. The viscous friction is negligible. . Show that when the motor rotates above its rated speed, the torque, T, is reduced but the developed power, Pa, is maintained. The calculation must clearly show the rated power and torque, torque and power at speed above the rated speed, and the comparison between them.

The speed of a 20-hp, 300-V, 1800-rpm separately excited dc motor is controlled by a three-phase full-converter drive. The field current is also controlled by a three-phase full converter and is set to the maximum possible value. The ac input is a three-phase, Y-connected, 208-V, 60-Hz supply. The armature resistance is Ra = 0.25 0, the field resistance is R = 245 0, and the motor voltage constant is K, = 1.2 VIA rad/s. The armature and field currents can be assumed to be continuous and ripple free. The viscous friction is negligible. . Show that when the motor rotates above its rated speed, the torque, T, is reduced but the developed power, Pa, is maintained. The calculation must clearly show the rated power and torque, torque and power at speed above the rated speed, and the comparison between them.

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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Hi, i dont mind receiving handwritten answer. Just doing homework, thanks in advance.

The speed of a 20-hp, 300-V, 1800-rpm separately excited dc motor is controlled by a three-phase full-converter drive. The field current is also controlled by a three-phase full converter and is set to the maximum possible value. The ac input is a three-phase, Y-connected, 208-V, 60-Hz supply. The armature resistance is Ra = 0.25 0, the field resistance is R; = 245 Q, and the motor voltage constant is Ky = 1.2 VIA rad/s. The armature and field currents can be assumed to be continuous and ripple free. The viscous friction is negligible. Show that when the motor rotates above its rated speed, the torque, r, is reduced but the developed power, Pa, is maintained. The calculation must clearly show the rated power and torque, torque and power at speed above the rated speed, and the comparison between them.
Transcribed Image Text:The speed of a 20-hp, 300-V, 1800-rpm separately excited dc motor is controlled by a three-phase full-converter drive. The field current is also controlled by a three-phase full converter and is set to the maximum possible value. The ac input is a three-phase, Y-connected, 208-V, 60-Hz supply. The armature resistance is Ra = 0.25 0, the field resistance is R; = 245 Q, and the motor voltage constant is Ky = 1.2 VIA rad/s. The armature and field currents can be assumed to be continuous and ripple free. The viscous friction is negligible. Show that when the motor rotates above its rated speed, the torque, r, is reduced but the developed power, Pa, is maintained. The calculation must clearly show the rated power and torque, torque and power at speed above the rated speed, and the comparison between them.
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