Problems #4

1. What are the advantages of the speed sensorless control? Briefly discuss different types of speed sensorless control scheme for the induction motor drive.

2. Discuss with the help of block diagram the basic philosophy of Model Reference Adaptive System (MRAS). How MRAS may be applied to estimate the speed of the induction motor drive? Explain the Popov’s criteria. Discuss a MRAS-based speed sensorless control scheme.

References:

1. Y.P.landau, “Adaptive Control: The Model Reference Approach,” Marcel Dekker, New York, 1979.

2. P. Vas, “Sensorless Vector and Direct Torque Control,” Oxford University Press, Oxford, 1998.

3. J.Holtz, “Sensorles Position Control of Induction Motors-An Emerging Technology,” IEEE Trans. on Industrial Electronics, Vol.45, No.6, pp. 840-852, Dec. 1998.