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A 208-V, Y-connected synchronous motor is drawing 40 A at unity power factor from a 208-V power system. The field current flowing under these conditions is 3 A. Its synchronous reactance is 0.7 ohms. Assume a linear open-circuit characteristic. (a) Find the torque angle 8. (b) How much field current would be required to make the motor operate at 0.9 PF leading? (c) What is the new torque angle?

A 208-V, Y-connected synchronous motor is drawing 40 A at unity power factor from a 208-V power system. The field current flowing under these conditions is 3 A. Its synchronous reactance is 0.7 ohms. Assume a linear open-circuit characteristic. (a) Find the torque angle 8. (b) How much field current would be required to make the motor operate at 0.9 PF leading? (c) What is the new torque angle?

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 208-V, Y-connected synchronous motor is drawing 40 A at unity power factor from a 208-V power system. The field current flowing under these conditions is 3 A. Its synchronous reactance is 0.7 ohms. Assume a linear open-circuit characteristic. (a) Find the torque angle d. (b) How much field current would be required to make the motor operate at 0.9 PF leading? (c) What is the new torque angle? Reminder: 208 V is terminal voltage. Hints: (1) Since the power supplied by the motor is constant, the quantity (IA cose). which is directly proportional to power, must be constant. (2) The internal generated voltage EA is assumed to be directly proportional to the field current.
Transcribed Image Text:A 208-V, Y-connected synchronous motor is drawing 40 A at unity power factor from a 208-V power system. The field current flowing under these conditions is 3 A. Its synchronous reactance is 0.7 ohms. Assume a linear open-circuit characteristic. (a) Find the torque angle d. (b) How much field current would be required to make the motor operate at 0.9 PF leading? (c) What is the new torque angle? Reminder: 208 V is terminal voltage. Hints: (1) Since the power supplied by the motor is constant, the quantity (IA cose). which is directly proportional to power, must be constant. (2) The internal generated voltage EA is assumed to be directly proportional to the field current.
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