The Proceedings of the Dynamics & Design Conference
Online ISSN : 2424-2993
2006
Session ID : 324
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324 Evaluation method for stability margin of rotor-active magnetic bearing system
Yoichi KANEMITSUXiao-Bing YOUNGShinya KIJIMOTOKoochi MATSUDA
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Abstract
In this paper, a phase margin, a gain margin, a sensitivity function, a maximum singular value of sensitivity function matrix and a damping ratio are taken up as indices which evaluate the stability margin of a rotor levitated by active magnetic bearings. The definition of the stability margin in this research is how far away the gain margin, the phase margin and the reciprocal number of the sensitivity function are from the critical point (-1, j0) in a polar plot. The stability margin distance is proposed to unify above-mentioned indices. We have estimated stability of a rotor-AMB system by these five indices and investigated relations among the indices.
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© 2006 The Japan Society of Mechanical Engineers
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