Specifying magnetic bearings

The rotor, the bearings, sensors and power electronics constitute a dynamic system with properties that can be set by designing a controller with the required closed-loop stability and robustness. For instance, for the turboexpander in the Figure, applying the ISO standard would mean that a five-by-...

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Bibliographic Details
Published inTurbomachinery international Vol. 48; no. 1; p. 27
Main Authors Philipp, Richard, René Larsonneur
Format Magazine Article
LanguageEnglish
Published Norwalk MultiMedia Healthcare Inc 01.01.2007
Subjects
Bearings
Changes
Controllers
Design
Differential equations
Fourier transforms
Frequencies
ISO standards
Mathematical models
Matrix
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Summary:The rotor, the bearings, sensors and power electronics constitute a dynamic system with properties that can be set by designing a controller with the required closed-loop stability and robustness. For instance, for the turboexpander in the Figure, applying the ISO standard would mean that a five-by-five sensitivity function matrix involving all control axes of a magnetic bearing system should be measured. The measurement can be done by injecting suitable test signals into the feedback path (red signal in Figure), measuring the corresponding system response (green), and finally computing the transfer function (blue) between test and response signals through a Fast Fourier Transform (FFT).
ISSN:0149-4147