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A 220-V Y-connected synchronous motor is drawing 50 A at unity power factor from a 220-V power system. The field current flowing under these conditions is 2.7 A. Its synchronous reactance is 1.4 ohms. Assume a linear open-circuit characteristic. (a) Find phase voltage and induced emf for these conditions. (b) Find the torque angle. (c) What is the maximum power that the machine can handle under these conditions? (d) How much armature current would be required to make the motor operate at 0.80 PF leading?

A 220-V Y-connected synchronous motor is drawing 50 A at unity power factor from a 220-V power system. The field current flowing under these conditions is 2.7 A. Its synchronous reactance is 1.4 ohms. Assume a linear open-circuit characteristic. (a) Find phase voltage and induced emf for these conditions. (b) Find the torque angle. (c) What is the maximum power that the machine can handle under these conditions? (d) How much armature current would be required to make the motor operate at 0.80 PF leading?

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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A 220-V Y-connected synchronous motor is drawing 50 A at unity power factor from a 220-V power system. The field current flowing under these conditions is 2.7 A. Its synchronous reactance is 1.4 ohms. Assume a linear open-circuit characteristic. (a) Find phase voltage and induced emf for these conditions. (b) Find the torque angle. (c) What is the maximum power that the machine can handle under these conditions? (d) How much armature current would be required to make the motor operate at 0.80 PF leading?
Transcribed Image Text:A 220-V Y-connected synchronous motor is drawing 50 A at unity power factor from a 220-V power system. The field current flowing under these conditions is 2.7 A. Its synchronous reactance is 1.4 ohms. Assume a linear open-circuit characteristic. (a) Find phase voltage and induced emf for these conditions. (b) Find the torque angle. (c) What is the maximum power that the machine can handle under these conditions? (d) How much armature current would be required to make the motor operate at 0.80 PF leading?
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