Affiliations: School of Electrical Engineering and Automation, Hefei University of Technology, Hefei, Anhui, China
Correspondence:
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Corresponding author: Xiaohua Bao, School of Electrical Engineering and Automation, Hefei University of Technology, Hefei 230009, Anhui, China. Tel.: +86 055162905883; Fax: +86 055162904435; E-mail: sukz@ustc.edu
Abstract: Air-gap eccentricity is commonly occurred in large
induction motors, especially submersible motors. Based on this failure, a
more accurate curved eccentricity model is established and current analysis
of the faulty machine is conducted in this paper. To carry out calculation,
winding function method is proposed aiming at calculation of the inductance
matrix in the multi-loop model and theoretical derivation is also presented.
A curved eccentricity model is set up by simulating the deflection of the
shaft and such model is applied to prototype (1200 kW submersible motor). By
analyzing harmonic characteristics in line current, the result proves
feasibility of current monitoring on curved eccentricity.
Keywords: Curved eccentricity, winding function method, induction motor, current analysis
