μ synthesis applied to the compliance minimization of an active magnetic bearing HSM spindle's thrust axis

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

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Many practical problems in magnetic bearing control concern essentially the minimization (maximization) of the dynamic compliance (stiffness) of the rotor. In this paper, the problem of minimizing the peak compliance of a high speed machining (HSM) spindle's thrust axis is examined. Experimental results are presented which demonstrate that μ synthesis provides an excellent tool for tackling this problem. Both complex μ and mixed μ synthesis are used to design controllers. The performance of the μ controllers is compared to that of an optimized PID controller. Under μ control, the dynamic stiffness of the system was increased by more than a factor of two over that obtained with the optimal PID controller. Careful attention was given to developing an accurate system model and uncertainty description, especially related to the transfer function of the magnetic actuators with solid stators and thrust disk.

Original languageEnglish
Pages (from-to)19-51
Number of pages33
JournalMachining Science and Technology
Volume7
Issue number1
DOIs
StatePublished - 2003

Bibliographical note

Funding Information:
This work was supported by Cincinnati Milacron, Inc. The authors would like to thank Dr. Stephen Fedigan for assistance with the digital controller.

Keywords

  • Bearing
  • Controls
  • High speed machining
  • Magnetics
  • Spindle

ASJC Scopus subject areas

  • Materials Science (all)
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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