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Mathematical Problems in Engineering
Volume 2013, Article ID 836058, 17 pages
http://dx.doi.org/10.1155/2013/836058
Research Article

Design and Mathematical Analysis of a Novel Reluctance Force-Type Hybrid Magnetic Bearing for Flywheel with Gimballing Capability

School of Instrument Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China

Received 13 March 2013; Revised 22 April 2013; Accepted 22 April 2013

Academic Editor: Igor Andrianov

Copyright © 2013 Chun'e Wang and Jiqiang Tang. 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.

Abstract

Magnetically suspended flywheel (MSFW) with gimballing capability fulfills requirements of precision and maneuvers for space applications. A novel reluctance force-type hybrid magnetic bearing (RFHMB) is presented based on analysis of demerits of Lorentz force-type magnetic bearing and common RFHMB. It features that radial and axial magnetic bearing units are integrated into a compact assembly with four separate biased permanent magnets and two conical stators; four radial poles with shoes and rotor made of iron-based amorphousness can reduce eddy loss. Equivalent magnetic circuits of permanent magnets and their control currents are presented. Simulation results indicate flux density fluctuates from 0.272 T to 0.41 T; rotor tilting does not affect the suspension force when rotor only tilts around -axis or -axis. When rotor drifts in , , or direction and tilts around -axis or -axis simultaneously, force in corresponding directions slightly increases with tilting angle’s enlargement, but the maximum change does not exceed 14%. Additional tilting torque mainly determined by uniformity of flux density in conical air gaps is 0.05 Nm which is far smaller than 11 Nm in common RFHMB; magnetic suspension force is effectively decoupled among , , and directions; results prove that MSFW with gimballing capability theoretically meets maneuvering requirement of spacecraft.