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Mathematical Problems in Engineering
Volume 2014, Article ID 570161, 10 pages
Review Article

Overview of Bearingless Induction Motors

1Automotive Engineering Research Institute, Jiangsu University, Zhenjiang 212013, China
2School of Electrical and Information Engineering, Jiangsu University, Zhenjiang 212013, China

Received 21 September 2013; Accepted 5 February 2014; Published 9 March 2014

Academic Editor: Ivo Doležel

Copyright © 2014 Xiaodong Sun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Bearingless induction motors combining functions of both torque generation and noncontact magnetic suspension together have attracted more and more attention in the past decades due to their definite advantages of compactness, simple structure, less maintenance, no wear particles, high rotational speed, and so forth. This paper overviews the key technologies of the bearingless induction motors, with emphasis on motor topologies, mathematical models, and control strategies. Particularly, in the control issues, the vector control, independent control, direct torque control, nonlinear decoupling control, sensorless control, and so forth are investigated. In addition, several possible development trends of the bearingless induction motors are also discussed.