Author:
T.-J. Yeh
Affiliation:
National Tsing Hua University, Taiwan
Keyword(s):
Magnetic Bearing, Permanent Magnet, LTR Control.
Related
Ontology
Subjects/Areas/Topics:
Engineering Applications
;
Informatics in Control, Automation and Robotics
;
Intelligent Control Systems and Optimization
;
Real-Time Systems Control
;
Robotics and Automation
;
Signal Processing, Sensors, Systems Modeling and Control
Abstract:
In this paper, a semi-active magnetic bearing system which incorporates both the active and passive magnetic
bearings is proposed for rotating machine applications. Particularly, the design, analysis, and control issues of
the semi-active system are investigated by using an axial fan as the platform. In the proposed system, while
the rotor is levitated axially by the active bearing, its radial and tilting stabilities are guaranteed by the passive
bearings. By carefully designing the radial and tilting stiffnesses of the passive bearings and the controller
of the active bearing, the system can be successfully operated to the rated speed of 4000rpm. Because the
semi-active magnetic system is frictionless and consumes insignificant power in levitation, its total power
consumption is 14.7% less than the conventional fan in which mechanical ball bearings are used.