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6-1. What is the difference bet ween a synchronous motor and a synchronous generator? 6-2. What is the speed regulation of a synchronous motor? 6-3. When would a synchronous motor be used even though its constant-speed charac- teristic was not needed?

6-1. What is the difference bet ween a synchronous motor and a synchronous generator? 6-2. What is the speed regulation of a synchronous motor? 6-3. When would a synchronous motor be used even though its constant-speed charac- teristic was not needed?

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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synchronous motor
QUESTIONS 6-1. What is the difference between a synchronous motor and a synchronous generator? 6-2. What is the speed regulation of a synchronous motor? 6-3. When would a synchronous motor be used even though its constant-speed charac- teristic was not needed? 6-4. Why can't a synchronous motor start by itself? 6-5. What techniques are available to start a synchronous motor? 6-6. What are amortisseur windings? Why is the torque produced by them unidirectional at starting, while the torque produced by the main field winding alternates direction? 6-7. What is a synchronous capacitor? Why would one be used? 6-8. Explain, using phasor diagrams, what happens to a synchronous motor as its field current is varied. Derive a synchronous motor V curve from the phasor diagram. 6-9. Is a synchronous motor's field circuit in more danger of overheating when it is op- erating at a leading or at a lagging power factor? Explain, using phasor diagrams. 6–10. A synchronous motor is operating at a fixed real load, and its field current is in- creased. If the armature current falls, was the motor initially operating at a lagging or a leading power factor? 6-11. Why must the voltage applied to a synchronous motor be derated for operation at frequencies lower than the rated value?
Transcribed Image Text:QUESTIONS 6-1. What is the difference between a synchronous motor and a synchronous generator? 6-2. What is the speed regulation of a synchronous motor? 6-3. When would a synchronous motor be used even though its constant-speed charac- teristic was not needed? 6-4. Why can't a synchronous motor start by itself? 6-5. What techniques are available to start a synchronous motor? 6-6. What are amortisseur windings? Why is the torque produced by them unidirectional at starting, while the torque produced by the main field winding alternates direction? 6-7. What is a synchronous capacitor? Why would one be used? 6-8. Explain, using phasor diagrams, what happens to a synchronous motor as its field current is varied. Derive a synchronous motor V curve from the phasor diagram. 6-9. Is a synchronous motor's field circuit in more danger of overheating when it is op- erating at a leading or at a lagging power factor? Explain, using phasor diagrams. 6–10. A synchronous motor is operating at a fixed real load, and its field current is in- creased. If the armature current falls, was the motor initially operating at a lagging or a leading power factor? 6-11. Why must the voltage applied to a synchronous motor be derated for operation at frequencies lower than the rated value?
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