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6-2. A 480-V, 60 Hz 400-hp, 0.8-PF-leading, six-pole, A-connected synchronous motor has a synchronous reactance of 1.1 N and negligible armature resistance. Ignore its friction, windage, and core losses for the purposes of this problem. (a) If this motor is initially supplying 400 hp at 0.8 PF lagging, what are the mag- nitudes and angles of Е and I? (b) How much torque is this motor producing? What is the torque angle 8? How near is this value to the maximum possible induced torque of the motor for this field current setting? (c) If EA is increased by 15 percent, what is the new magnitude of the armature current? What is the motor's new power factor? (d) Calculate and plot the motor's V curve for this load condition.

6-2. A 480-V, 60 Hz 400-hp, 0.8-PF-leading, six-pole, A-connected synchronous motor has a synchronous reactance of 1.1 N and negligible armature resistance. Ignore its friction, windage, and core losses for the purposes of this problem. (a) If this motor is initially supplying 400 hp at 0.8 PF lagging, what are the mag- nitudes and angles of Е and I? (b) How much torque is this motor producing? What is the torque angle 8? How near is this value to the maximum possible induced torque of the motor for this field current setting? (c) If EA is increased by 15 percent, what is the new magnitude of the armature current? What is the motor's new power factor? (d) Calculate and plot the motor's V curve for this load condition.

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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6–2. A 480-V, 60 Hz 400-hp, 0.8-PF-leading, six-pole, A-connected synchronous motor has a synchronous reactance of 1.1 № and negligible armature resistance. Ignore its friction, windage, and core losses for the purposes of this problem. (a) If this motor is initially supplying 400 hp at 0.8 PF lagging, what are the mag- nitudes and angles of EA and IA? (b) How much torque is this motor producing? What is the torque angle 8? How near is this value to the maximum possible induced torque of the motor for this field current setting? (c) If EÂ is increased by 15 percent, what is the new magnitude of the armature current? What is the motor's new power factor? (d) Calculate and plot the motor's V curve for this load condition.
Transcribed Image Text:6–2. A 480-V, 60 Hz 400-hp, 0.8-PF-leading, six-pole, A-connected synchronous motor has a synchronous reactance of 1.1 № and negligible armature resistance. Ignore its friction, windage, and core losses for the purposes of this problem. (a) If this motor is initially supplying 400 hp at 0.8 PF lagging, what are the mag- nitudes and angles of EA and IA? (b) How much torque is this motor producing? What is the torque angle 8? How near is this value to the maximum possible induced torque of the motor for this field current setting? (c) If EÂ is increased by 15 percent, what is the new magnitude of the armature current? What is the motor's new power factor? (d) Calculate and plot the motor's V curve for this load condition.
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