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The synchronous machine in Problem 4 is operated as a synchronous motor from the 30, 208 V, 60 Hz power supply. The field excitation is adjusted so that the power factor is unity when the machine draws 3 kW from the supply. (a) Find the excitation voltage and the power angle. Draw the phasor diagram for this condition. (b) If the field excitation is held constant and the shaft load is slowly increased, determine the maximum torque (i.e., pull-out torque) that the motor can deliver.

The synchronous machine in Problem 4 is operated as a synchronous motor from the 30, 208 V, 60 Hz power supply. The field excitation is adjusted so that the power factor is unity when the machine draws 3 kW from the supply. (a) Find the excitation voltage and the power angle. Draw the phasor diagram for this condition. (b) If the field excitation is held constant and the shaft load is slowly increased, determine the maximum torque (i.e., pull-out torque) that the motor can deliver.

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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The synchronous machine in Problem 4 is operated as a synchronous motor from the 30, 208 V, 60 Hz power supply. The field excitation is adjusted so that the power factor is unity when the machine draws 3 kW from the supply. (a) Find the excitation voltage and the power angle. Draw the phasor diagram for this condition. (b) If the field excitation is held constant and the shaft load is slowly increased, determine the maximum torque (i.e., pull-out torque) that the motor can deliver.
Transcribed Image Text:The synchronous machine in Problem 4 is operated as a synchronous motor from the 30, 208 V, 60 Hz power supply. The field excitation is adjusted so that the power factor is unity when the machine draws 3 kW from the supply. (a) Find the excitation voltage and the power angle. Draw the phasor diagram for this condition. (b) If the field excitation is held constant and the shaft load is slowly increased, determine the maximum torque (i.e., pull-out torque) that the motor can deliver.
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