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Sensorless speed measurement of induction motors using an adaptive frequency-tracking algorithm

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3 Author(s)
McNamara, D.M. ; Dept. of Electr. & Comput. Eng., Clarkson Univ., Potsdam, NY ; Enayati, B. ; Ziarani, A.K.

Sensorless speed estimation is of importance to a variety of industrial applications where speed information is required. Standard shaft-mounted speed transducers are the commonplace solution to speed estimation. However, they add complexity to a motor and wear with time. This paper presents a novel technique of determining speed from eccentricity harmonics within the stator current. The presented technique provides a computationally efficient, real-time sensorless speed measurement method based on a frequency-tracking signal processing algorithm. The proposed technique is shown to be advantageous in that it is capable of providing precise real-time speed estimation through changes in mechanical load and source frequency changes. The developed technique is suitable for all adjustable drives including direct torque control (DTC) drives.

Published in:

Industrial Electronics, 2008. IECON 2008. 34th Annual Conference of IEEE

Date of Conference:

10-13 Nov. 2008