Vibration Control for a Rotor Supported by Oil-Film Bearings Using a Bearingless Motor

Rotors of large turbomachinery are usually supported by oil-film bearings, because an oil-film bearing has a simple structure, high load capacity, and large damping. However, an oil-film bearing induces self-excited vibration at high rotational speeds. Therefore, a suppression method for the self-ex...

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Bibliographic Details
Published in:IEEE/ASME transactions on mechatronics 2019-06, Vol.24 (3), p.1368-1375
Main Authors: Tsunoda, Wataru, Chiba, Akira, Shinshi, Tadahiko
Format: Article
Language:English
Subjects:
Bearing
Bearingless motor (BELM)
Bearings
Brushless DC motors
Configuration management
Control systems design
Damping capacity
Force
High speed
Motor rotors
oil-film bearing
Permanent magnet motors
Production planning
Rotation
Rotors
self-excited vibration
Suspension systems
Synchronous motors
Turbomachinery
Vibration control
vibration of rotating body
Vibrations
Windings
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Summary:Rotors of large turbomachinery are usually supported by oil-film bearings, because an oil-film bearing has a simple structure, high load capacity, and large damping. However, an oil-film bearing induces self-excited vibration at high rotational speeds. Therefore, a suppression method for the self-excited vibration is needed. This study proposes the application of a bearingless motor (BELM) for a rotor supported by oil-film bearings. To realize the proposed rotor system, an experimental rotor, supported by the oil-film bearings and equipped with a BELM, is designed and fabricated. This study illustrates the winding configuration and the controller design of the BELM for a stable suspension system. The test rotor with the oil-film bearings and the BELM exhibited stable rotation at rotational speeds higher than the onset speed of the self-excited vibration. Furthermore, the radial force required to suppress the self-excited vibration is discussed. Because it is desirable for the radial force of the BELM to be small in the actual machine, we realized a stable and high-speed rotation with a small radial force. Thus, we demonstrate the feasibility of a compact, stable, and high-speed rotor-oil-film bearing system.
ISSN:1083-4435
1941-014X
DOI:10.1109/TMECH.2019.2908929