13-02-2016, 03:18 PM
PART – A
1. What is a stepper motor?
2. What are the main features of stepper motor which are responsible for its wide spread use?
3. Name the different types of stepper motor. (Nov/Dec-08) (Nov/Dec-09) (april/may-10)
4. Define the term step angle. (april/may-07) (april/may-08) (April/May-13) (Nov/Dec-13)
5. Define slewing. (Nov/Dec-09)
6. What is a slewing rate?
7. Define Resolution.
8. What are the different modes of excitation in a stepper motor? (april/may-12)
9. What is meant by full-step operation?
10. What is meant by half-step configuration?
11. What is meant by micro stepping in stepper motor?
12. What is a multi-stack VR stepper motor?
13. What is synchronism in stepper motor?
14. What is variable reluctance stepper motor?
15. What is Permanent Magnet Stepper Motor?
16. What is Hybrid Stepper Motor? (Nov/Dec-07) (Nov/Dec-11)
17. What is meant by micro stepping in stepper motor?
18. What are the advantages and disadvantages of VR Stepper motor?
19. What are the advantages and disadvantages of PM Stepper motor?
20. What are the advantages and disadvantages of Hybrid Stepper motor?
21. What are the different types of drive circuits for stepper motor?
22. Name the various modes of excitation in stepping motor.
23. Draw the typical static characteristics of a stepper motor.
24. What is meant by power driving circuit?
25. What is logic sequencer?
26. What is lead angle?
27. Mention the application of stepper motor.
28. Distinguish between VR, PM, and hybrid stepper motor.
29. Define holding and detente torque. (april/may-07) (Nov/Dec-07) (Nov/Dec-08) (april/may-11)
30. Define torque constant. (Nov/Dec-12)
31. Draw the typical dynamic characteristics of a stepper motor.
32. Differentiate pull-in torque from pull-out torque.
33. Differentiate pull-in rate from pull-out rate.
34. What do you mean by slewing range? (april/may-09)
35. What do you mean by mid-frequency resonance in stepper motor?
36. Draw the block diagram of the drive system of a stepper motor. (Nov/Dec-11)
37. What is a logic sequencer?
38. What is meant by power drive circuit in stepper motor?
39. What is the use of current suppression circuit?
40. What are the different types of current suppression circuit?
41. Draw any two drive-circuits for stepper motor.
42. How is step of permanent magnet stepper motor controlled?
43. What are the disadvantages of stepper motor? (april/may-09)
44. What is the step angle of a 4 phase stepper motor with 12 stator teeth and 3 rotor teeth? (april/may-10) (april/may-11)
45. Write down the equation for step angle of stepper motor. (Nov/Dec-10)
46. Draw the equivalent circuit of a winding in stepper motor. (Nov/Dec-10)
47. Compare single stack and multi-stack configuration in stepping motors. (april/may-12) (april/may-
48. Calculate the stepping angle for a 3 phase, 24 pole permanent magnet stepper motor.
49. What is the function of drive circuit in stepping motor? (April/May-13)
50. Write the principle of operation of stepping motors. (april/may-14)
PART – B
1. Describe the operation of a variable reluctance type stepper motor. What is meant by micro stepping also explain? (april/may-07) (april/may-08) (Nov/Dec-08) (Nov/Dec-09) (Nov/Dec-12)
2. Explain the working of a hybrid stepper motor? (april/may-07) (april/may-08) (Nov/Dec-08)
3. Draw and explain the torque pulse rate characteristics of stepper motor. (april/may-07)
4. Explain the construction and principle of operation of VR stepping motor in detail. & also explain the operation for half step mode. (Nov/Dec-07)
5. Write short notes about the drive circuits of stepping motors. (6) (Nov/Dec-07)(april/may-09)
6. Explain the principle of operation and constructional features of hybrid motors in detail.
7. Explain torque versus stepping rate characteristics of a stepper motor. Also explain about slew range and ramping.(10)
8. What is step angle? Calculate the stepping angle for a 3 phase 24-pole permanent magnet type steppper motor.(6) (april/may-08) (april/may-09) (april/may-11) (Nov/Dec-13)
9. Explain the operation of stepper motor. (april/may-09)
10. Draw & explain the dynamic characteristics of stepper motor. (april/may-09) (april/may-10)
11. What is stepping angle? A VR stepper motor has 8 poles in the stator and they have five teeth in each pole. If the rotor has 50 teeth, calculate the step angle and resolution. (Nov/Dec-09)
12. Explain the construction and various modes of excitation of PM stepper motor. (april/may-10)
13. Explain the mechanism of torque production in VR stepper motors. (april/may-10) (Nov/Dec-13)
14. With a neat sketch, explain the different types of Logic sequencers for a stepper motor.
15. Discuss the principle of operations of permanent magnet stepper motor with torque Vs angle characteristics.
16. Discuss dual voltage driver circuit for two phase on drive of a four phase stepper motor and explain the nature of current build up in dual voltage drive. (Nov/Dec-11) . (april/may-12)
17. A single stack, 3 phase variable reluctance motor has a step angle of 15˚. Find the number of stator and rotor poles.
18. What is the motor torque Tm required to accelerate an initial load of 2×10-4 kg-m2 from 500 Hz to 1500 Hz in 50ms. The frictional torque is 0.03 Nm and step angle is 1.18˚.(Nov/Dec-12)
19. Write a detailed technical note on the bipolar drives for stepper motors. ˚.(Nov/Dec-12)
20. With a neat block diagram explain microprocessor control of stepping motor. (april/may-13)
21. Explain the working of single and multi-stack configured stepping motors. (april/may-13)
22. Explain the modes of excitation & characteristics of Stepper motor in detail(april/may-14)