Rotor point compliance minimization via μ-synthesis

Roger L. Fittro, Carl R. Knospe, L. Scott Stephens

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


Many practical problems in magnetic bearing control concern essentially the minimization of the compliance of the rotor at a particular point, often not a bearing or sensor location. Experimental results are presented which demonstrate that controller design problems of this type can be tackled via μ-synthesis. The problem of minimizing the peak compliance at the midspan of a rotor test rig is examined. A significant improvement in performance is obtained by a multivariable μ controller over a benchmark optimal decentralized PD controller. Interestingly, the μ controller obtained is unstable. Therefore, the rotor is first levitated with a PD controller and then the multivariable algorithm is implemented. Careful attention is given to developing an accurate system model, especially the transfer function of the magnetic actuators with solid stators.

Original languageEnglish
Pages (from-to)1319-1323
Number of pages5
JournalProceedings of the American Control Conference
StatePublished - 1997
EventProceedings of the 1997 American Control Conference. Part 3 (of 6) - Albuquerque, NM, USA
Duration: Jun 4 1997Jun 6 1997

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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