Anna University Chennai 2007-7th Sem B.E Electrical and Electronics Engineering ./B.Tech , / ,ester,(Regulation 2004),,EE 1001 – SPECIAL ELECTRICAL MACHINES,(Common to .(Part Time) Sixth Semester reg

B.E./B.Tech DEGREE EXAMINATION, NOV/DEC 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 a vernier motor?
2. Write down any 2 properties of synchronous reluctance motor.
3. What is holding torque in stepping motor?
4. What is hybrid motor/
5. List out any 4 applications of switched reluctance motor.
6. What are the kind of power controllers used for switched reluctance motor?
7. What are the kinds of permanent magnet DC motor?
8. What is permanent magnet DC commutator motor?
9. List out the difference ranging from the PMBLDC motor and PM synchronous motor.
10. What is meant by slot less motor?

PART B – (5x16 = 80 marks)

11.(a) (i) discuss the principle of operation and constructional features of synchronous reluctance motor. (9)
(ii) discuss the working of vernier motor with neat diagram. (7)
(OR)
(b) (i) discuss the circle diagram and torque speed characteristics of synchronous reluctance motors. (9)
(ii) discuss the synchronous reluctance of PM synchronous reluctance motors. (7)

12.(a) discuss the construction and principle of operation of VR stepping motor in detail. (16)
(OR)
(b) (i) Write short notes about the drive circuits of stepping motors? (6)
(ii) discuss the principle of operation and constructional features of hybrid motors in detail. (10)

13. (a) (i) Draw and discuss the characteristics of SR motor in detail. (10)
(ii) discuss the shaft position sensing of SR motor. (6)
(OR)
(b) (i) discuss the constructional features of SR motor I detail. (9)
(ii) discuss the role of computers in the control of SR moor. (7)





14. (a) (i) Derive the torque and EMF equations of the permanent magnet brushless DC motor. (10)
(ii) discuss the principle of operation of PMBLDC motor. (6)

(OR)
(b) discuss the modes of operation of power controllers for PMBL DC motor with a neat diagram. (16)

15.(a) (i) discuss the principle of operation of permanent magnet synchronous motors. (6)
(ii) Derive the EMF and Torque equations of PMSM. (10)
(OR)
(b) discuss the microprocessor based control of PMSM with neat block diagram and list out the advantages. (16)

Earning:   Approval pending.