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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Published in | Turbomachinery international Vol. 48; no. 1; p. 27 |
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Main Authors | , |
Format | Magazine Article |
Language | English |
Published |
Norwalk
MultiMedia Healthcare Inc
01.01.2007
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Subjects | |
Online Access | Get full text |
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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). |
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ISSN: | 0149-4147 |