NDLI: Potentials for reducing the power requirement of magnetic suspension systems by implementing a linear quadratic gaussian controller

Content Provider	IEEE Xplore Digital Library
Author	Schuhmann, T. Hofmann, W. Fleischer, E.
Copyright Year	2007
Description	Author affiliation: Chemnitz Univ. of Technol., Chemnitz (Schuhmann, T.; Hofmann, W.; Fleischer, E.)
Abstract	Magnetic bearings provide an energy-saving and resource-sparing possibility for supporting rotors running at high speed. This paper studies the potential of reducing the energy demand of magnetic levitation systems. Practical investigations show that this is obtainable by combining an optimal state estimator with an optimal state space controller. This configuration is known as Linear Quadratic Gaussian (LQG) regulator. In a sequential way, all the steps required for implementing this control strategy are depicted, starting with describing and modelling of the system which is a fully magnetically levitated blower in this case. Subsequently, the realization of the system state estimator is delineated. Both hints for carrying out the discretization of the continuous time model and a simple approach for choosing the variance matrices of the estimator are given. Special attention is paid to the design of the state feedback controller. The influence of the weighting matrix elements on the controller performance is investigated as well as an integrative extension of the regulator which ensures good reference response behaviour. Finally, measurements concerning the energy consumption of the levitation system are presented. The results show that both in static and dynamic case the implementation of the LQG regulator yields reduced control energy effort, compared to a system controlled by a conventional PID controller. It is noteworthy that, simultaneously to the enhancement of energy efficiency, implementing the LQG controller improves the dynamic properties of the levitation system, e.g. transient time and overshoot.
Starting Page	1
Ending Page	10
File Size	734602
Page Count	10
File Format	PDF
ISBN	9789275815108
DOI	10.1109/EPE.2007.4417236
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-09-02
Publisher Place	Denmark
Access Restriction	Subscribed
Rights Holder	EPE Association
Subject Keyword	State feedback Energy consumption Regulators estimation technique magnetic bearings Energy measurement Control systems Continuous time systems optimal control State-space methods Efficiency Optimal control mechatronics State estimation Magnetic levitation
Content Type	Text
Resource Type	Article

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