Anna University Chennai 2007-7th Sem B.E Electrical and Electronics Engineering ./B.Tech , /E ,ester,,EE 1001 – SPECIAL ELECTRICAL MACHINES - Question Paper

B.E./B.Tech DEGREE EXAMINATION, MAY/JUNE 2007
Seventh semester
(Regulation 2004)
Electrical and Electronics Engineering
EE 1001 – SPECIAL ELECTRICAL MACHINES
(Common to B.E.(Part Time) 6th Semester regulation 2005)
Time : 3 Hours Maximum: 100 marks
ans all ques.
PART A –(10x2=20)

1. What is the main advantage of synchronous reluctance motor?
2. List the application of synchronous reluctance motor.
3. Define the term step angle.
4. What is meant by detent torque?
5. What is the significance of closed loop control in switched reluctance motor?
6. List out the advantages of switched reluctance motor.
7. What are the kinds of materials used in PMDC motors?
8. State a few important applications of PMDC motor?
9. How a permanent magnet synchronous motor is stated?
10. What are the advantages of permanent magnet synchronous motor?

PART B – (5x16 = 80 marks)

11.(a) define the construction working and uses of a reluctance motor. (16)
(OR)
(b) Draw and discuss a typical torque speed characteristics of a reluctance motor. Compare a reluctance motor with an equivalent induction motor. (16)

12. (a) define the operation of a variable reluctance kind stepper motor. What is meant by micro stepping also explain? (16)
(OR)
(b) (i) discuss the working of a hybrid stepper motor. (8)
(ii) Draw and discuss the torque pulse rate characteristics of stepper motor. (8)

13.(a) With neat diagram, discuss the construction and working of switched reluctance motor. (16)
(OR)
(b) (i) With neat diagram, discuss the importance of closed loop control in SR motor. (10)
(ii) Compare SR motor with VR stepper motor. (6)

14.(a) define the construction of a permanent magnet dc motor. elaborate the advantages and disadvantages of PMDC motors compared with conventional shunt dc motors? (16)
(OR)
(b) (i) discuss the speed torque characteristics of PMDC motor. (8)
(ii) Write a note on power controllers used in PMDC motor. (8)
15. (a) discuss the construction and performance of permanent magnet synchronous motor with neat diagram. (16)
(OR)
(b) Clearly discuss the microprocessor based control of PMSM. (16)

Earning:   Approval pending.