Estimation of the number of rotor slots and rotor speed in induction motors using current, flux or vibration signature analysis
Date
2008
Authors
Supangat, R.
Ertugrul, N.
Soong, W.
Gray, D.
Hansen, C.
Grieger, J.
Editors
Advisors
Journal Title
Journal ISSN
Volume Title
Type:
Journal article
Citation
Australian Journal of Electrical and Electronics Engineering, 2008; 4(3):259-268
Statement of Responsibility
Supangat Randy; Ertugrul Nesimi; Soong Wen L; Gray Douglas A; Hansen Colin and Grieger Jason
Conference Name
Abstract
Effective condition monitoring of induction motors requires knowledge of the number of rotor slots and the rotor speed. These were primarily obtained in the literature by multiple measurements and using design knowledge of the motor under test. Furthermore, the earlier studies have mainly concentrated on stator current analysis. This paper investigates the use of the stator current, axial flux and vibration signals in order to provide accurate rotor speed and rotor slot number estimation by utilising the eccentricity harmonics, slip frequency, rotor frequency and rotor slot passing frequency. The proposed methods are examined using an extensive series of measurements on a 2.2 kW squirrel-cage and a 5 kW wound-rotor induction motor over a wide range of loading conditions.