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6-1. What are slip and slip speed in an induction motor? 6-2. How does an induction motor develop torque? 6-3. Why is it impossible for an induction motor to operate at synchronous speed?

6-1. What are slip and slip speed in an induction motor? 6-2. How does an induction motor develop torque? 6-3. Why is it impossible for an induction motor to operate at synchronous speed?

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter35: Harmonics 916
Section: Chapter Questions
Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...
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QUESTIONS 6-1. What are slip and slip speed in an induction motor? 6-2. How does an induction motor develop torque? 6-3. Why is it impossible for an induction motor to operate at synchronous speed? 6-4. Sketch and explain the shape of a typical induction motor torque-specd characteris- tic curve. 6-5. What equivalent circuit element has the most direct control over the speed at which the pullout torque occurs? 6-6. What is a deep-bar cage rotor? Why is it used? What NEMA design class(es) can be built with it? 6-7. What is a double-cage cage rotor? Why is it used? What NEMA design class(es) can be built with it? 6-8. Describe the characteristics and uses of wound-rotor induction motors and of each NEMA design class of cage motors. 6-9. Why is the efficiency of an induction motor (wound-rotor or cage) so poor at high slips? 6-10. Name and describe four means of controlling the speed of induction motors. 6-11. Why is it necessary to reduce the voltage applied to an induction motor as electrical frequency is reduced? 6-12. Why is terminal voltage speed control limited in operating range? 6-13. What are starting code factors? What do they say about the starting current of an in- duction motor? 6-14. How does a resistive starter circuit for an induction motor work? 6-15. What information is learned in a locked-rotor test? 6-16. What information is learned in a no-load test? 6-17. What actions are taken to improve the efficiency of modern high-efficiency induc- tion motors? 6-18. What controls the terminal voltage of an induction generator operating alone? 6-19. For what applications are induction generators typically used? 6-20. How can a wound-rotor induction motor be used as a frequency changer? 6-21. How do different voltage-frequency patterns affect the torque-speed characteristics of an induction motor? 6-22. Describe the major features of the solid-state induction motor drive featured in Sec- tion 6.10. 6-23. Two 480-V, 100-hp induction motors are manufactured. One is designed for 50-Hz operation, and one is designed for 60-Hz operation, but they are otherwise similar. Which of these machines is larger?
Transcribed Image Text:QUESTIONS 6-1. What are slip and slip speed in an induction motor? 6-2. How does an induction motor develop torque? 6-3. Why is it impossible for an induction motor to operate at synchronous speed? 6-4. Sketch and explain the shape of a typical induction motor torque-specd characteris- tic curve. 6-5. What equivalent circuit element has the most direct control over the speed at which the pullout torque occurs? 6-6. What is a deep-bar cage rotor? Why is it used? What NEMA design class(es) can be built with it? 6-7. What is a double-cage cage rotor? Why is it used? What NEMA design class(es) can be built with it? 6-8. Describe the characteristics and uses of wound-rotor induction motors and of each NEMA design class of cage motors. 6-9. Why is the efficiency of an induction motor (wound-rotor or cage) so poor at high slips? 6-10. Name and describe four means of controlling the speed of induction motors. 6-11. Why is it necessary to reduce the voltage applied to an induction motor as electrical frequency is reduced? 6-12. Why is terminal voltage speed control limited in operating range? 6-13. What are starting code factors? What do they say about the starting current of an in- duction motor? 6-14. How does a resistive starter circuit for an induction motor work? 6-15. What information is learned in a locked-rotor test? 6-16. What information is learned in a no-load test? 6-17. What actions are taken to improve the efficiency of modern high-efficiency induc- tion motors? 6-18. What controls the terminal voltage of an induction generator operating alone? 6-19. For what applications are induction generators typically used? 6-20. How can a wound-rotor induction motor be used as a frequency changer? 6-21. How do different voltage-frequency patterns affect the torque-speed characteristics of an induction motor? 6-22. Describe the major features of the solid-state induction motor drive featured in Sec- tion 6.10. 6-23. Two 480-V, 100-hp induction motors are manufactured. One is designed for 50-Hz operation, and one is designed for 60-Hz operation, but they are otherwise similar. Which of these machines is larger?
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