System modeling and robust control of an AMB spindle: part I modeling and validation for robust control View Full Text


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Article Info

DATE

2003-12

AUTHORS

Hyeong-Joon Ahn, Dong-Chul Han

ABSTRACT

This paper discusses details of modeling and robust control of an AMB (active magnetic bearing) spindle, and part I presents a modeling and validation process of the AMB spindle. There are many components in AMB spindle : electromagnetic actuator, sensor, rotor, power amplifier and digital controller. If each component is carefully modeled and evaluated, the components have tight structured uncertainty bounds and achievable performance of the system increases. However, since some unknown dynamics may exist and the augmented plant could show some discrepancy with the real plant, the validation of the augmented plant is needed through measuring overall frequency responses of the actual plant. In addition, it is necessary to combine several components and identify them with a reduced order model. First, all components of the AMB spindle are carefully modeled and identified based on experimental data, which also render valuable information in quantifying structured uncertainties. Since sensors, power amplifiers and discretization dynamics can be considered as time delay components, such dynamics are combined and identified with a reduced order. Then, frequency responses of the open-loop plant are measured through closed-loop experiments to validate the augmented plant. The whole modeling process gives an accurate nominal model of a low order for the robust control design. More... »

PAGES

1844-1854

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02982423

DOI

http://dx.doi.org/10.1007/bf02982423

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1012516609


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