An air-gap-flux-oriented vector controller for stable operation of bearingless induction motors

Author

Suzuki, Takahiro ; Chiba, Akira ; Rahman, M. Azizur ; Fukao, Tadashi

Author_Institution

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

Volume

36

Issue

4

fYear

2000

Firstpage

1069

Lastpage

1076

Abstract

A bearingless induction machine has combined characteristics of an induction motor and magnetic bearings. It is known that the magnetic suspension of the rotor becomes unstable at overload operation, particularly in transient conditions. A novel air-gap-flux-oriented vector control scheme has been proposed to operate the bearingless induction motor during the high torque acceleration period. It has been found that there is an optimal flux orientation for complete decoupling in radial force generation. Test results in a laboratory bearingless induction motor validates the performance efficacy of proposed controller at overload conditions

Keywords

control system synthesis; induction motors; machine testing; machine theory; machine vector control; machine windings; magnetic bearings; stability; air-gap-flux-oriented vector controller; bearingless induction motors; control design; control performance efficacy; high torque acceleration period; magnetic bearings; optimal flux orientation; overload operation; radial force generation; rotor magnetic suspension stability; stable operation; transient conditions; Acceleration; Costs; Force control; Induction generators; Induction motors; Inverters; Machine vector control; Magnetic fields; Magnetic levitation; Rotors;

fLanguage

English

Journal_Title

Industry Applications, IEEE Transactions on

Publisher

ieee

ISSN

0093-9994

Type

jour

DOI

10.1109/28.855962

Filename

855962