Sources and Characteristics of Unbalanced Magnetic Pull in Three-Phase Cage Induction Motors With Axial-Varying Rotor Eccentricity

Author

Dorrell, David G.

Author_Institution

Univ. of Technol. Sydney, Sydney, NSW, Australia

Volume

47

Issue

1

fYear

2011

Firstpage

12

Lastpage

24

Abstract

This paper puts forward a model for assessing unbalanced magnetic pull (UMP) due to rotor eccentricity in cage induction motors that takes into account the axial variation in the eccentricity. It is tested using ten- and four-pole machines with experimental results validating the model. This paper assesses the effects of rotor differential flux, saturation, bar number, and variable-frequency operation on the UMP and highlights the key points for the generation of UMP in cage induction motors. Both dynamic and static eccentricities are studied.

Keywords

induction motors; magnetic flux; rotors; axial-varying rotor eccentricity; bar number; four-pole machines; rotor differential flux; saturation; ten-pole machines; three-phase cage induction motors; unbalanced magnetic pull; variable-frequency operation; Air gaps; Harmonic analysis; Niobium; Rotors; Stator windings; Windings; Induction motor; rotor eccentricity; unbalanced magnetic pull (UMP);

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/TIA.2010.2090845

Filename

5620970