Paper Info
Title
Theoretical Analysis and Experimental Validation of a Simplified Fractional Order Controller for a Magnetic Levitation System.
Abstract
Fractional order (FO) controllers are among the emerging solutions for increasing closed-loop performance and robustness. However, they have been applied mostly to stable processes. When applied to unstable systems, the tuning technique uses the well-known frequency-domain procedures or complex genetic algorithms. This brief proposes a special type of an FO controller, as well as a novel tuning procedure, which is simple and does not involve any optimization routines. The controller parameters may be determined directly using overshoot requirements and the study of the stability of FO systems. The tuning procedure is given for the general case of a class of unstable systems with pole multiplicity. The advantage of the proposed FO controller consists in the simplicity of the tuning approach. The case study considered in this brief consists in a magnetic levitation system. The experimental results provided show that the designed controller can indeed stabilize the magnetic levitation system, as well as provide robustness to modeling uncertainties and supplementary loading conditions. For comparison purposes, a simple PID controller is also designed to point out the advantages of using the proposed FO controller.
Year
DOI
Venue
2016
10.1109/TCST.2015.2446496
IEEE Trans. Contr. Sys. Techn.
Keywords
Field
DocType
Magnetic levitation,Tuning,Stability analysis,Closed loop systems,Robustness,Transfer functions,Permanent magnets
Control theory,PID controller,Nonlinear control,Control theory,Overshoot (signal),Robustness (computer science),Control engineering,Magnetic levitation,Fractional calculus,Mathematics,Sliding mode control
Journal
Volume
Issue
ISSN
24
2
1063-6536
Citations 
PageRank 
References 
6
0.59
13
Authors
4
Name
Order
Citations
PageRank
Silviu Folea1399.60
Cristina I. Muresan22613.57
Robin De Keyser336056.35
Clara M. Ionescu435162.42