The causes and consequences of phase unbalance in single-sided linear induction motors

Author

Adamiak, K. ; Ananthasivam, Krishnamoorthy ; Dawson, Graham E. ; Eastham, Anthony R. ; Gieras, Jacek F.

Author_Institution

Dept. of Electr. Eng., Queen´´s Univ., Kingston, Ont., Canada

Volume

24

Issue

6

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

3223

Lastpage

3233

Abstract

Unbalance in the phase currents of a single-sided linear induction motor (LIM) under balanced voltage operation is due to asymmetry of the primary windings and to the longitudinal end effect. Two methods of evaluating phase unbalance are presented. The first is analytical and is based on an equivalent circuit model. The second approach is numerical and uses the finite-element method. Computational results are validated by comparison with test results on a large-scale single-sided LIM. It is shown that phase unbalance produces a reduction in both thrust and normal forces, but this effect is likely to be significant only for high-speed LIMs

Keywords

equivalent circuits; induction motors; machine windings; asymmetry; balanced voltage operation; equivalent circuit model; finite-element method; longitudinal end effect; phase currents; phase unbalance; primary windings; single-sided linear induction motors; thrust; Degradation; Electromagnetic analysis; Equivalent circuits; Finite element methods; Impedance; Induction motors; Machine windings; Magnetic analysis; Transportation; Voltage;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.92381

Filename

92381