Electronic Design, Test and Applications, IEEE International Workshop on (2002)
Christchurch, New Zealand
Jan. 29, 2002 to Jan. 31, 2002
William Phipps , Eastern Institute of Technology
Ibrahim Al-Bahadly , Massey University
This paper describes a method o sensorless speed estimation that is low cost and easy to implement. It uses two different algorithms,and so compensates or the weaknesses of the individual algorithms producing a robust low lost application. A method is investigated that uses the rotor slot harmonics to estimate the speed o the motor above 300rpm. At lower speeds the rotor slot harmonic method becomes unreliable,due to the difficulty in detecting the harmonics at lower speeds. A slip detection method,using an empirical ormula is to be used during the speed "blind spot ",providing speed estimation and so increasing the dynamic range of the system as a whole.
I. Al-Bahadly and W. Phipps, "Sensorless Speed Control in Induction Motor Drives," Electronic Design, Test and Applications, IEEE International Workshop on(DELTA), Christchurch, New Zealand, 2002, pp. 480.