Characteristics of a bearingless induction motor

Author

Chiba, A. ; Power, D.T. ; Rahman, M.A.

Author_Institution

Dept. of Electr. Eng., Sci. Univ. of Tokyo, Chiba, Japan

Volume

27

Issue

6

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

5199

Lastpage

5201

Abstract

A bearingless induction motor with additional windings in the stator slots is proposed. Additional two-pole windings were wound with the conventional four-pole windings to produce radial magnetic forces. These forces, which control the position of the rotor shaft, are produced when magnetic fluxes from the two-pole windings cause an imbalance in the revolving magnetic field of the four-pole windings. Inductance functions were measured to derive the machine inductance matrix expression, and from this matrix the radial force and current relationships were found. Control circuits were designed and fabricated for a test machine. This test machine was successfully driven by the control circuits. A bearingless induction motor was successfully operated at speeds up to 6000 r/min

Keywords

inductance; induction motors; additional windings; bearingless induction motor; control circuits; machine inductance matrix; radial magnetic forces; stator slots; test machine; two-pole windings; winding current; Circuit testing; Force control; Force measurement; Induction motors; Magnetic field measurement; Magnetic forces; Rotors; Shafts; Stator windings; Wounds;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.278786

Filename

278786