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)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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
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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