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Actuators 2017, 6(2), 13; doi:10.3390/act6020013

A System Identification Technique Using Bias Current Perturbation for the Determination of the Magnetic Axes of an Active Magnetic Bearing

1
Joseph F. Ware, Jr. Advanced Engineering Lab, College of Engineering, Virginia Tech, Blacksburg, VA 24061, USA
2
Department of Engineering, James Madison University, Harrisonburg, VA 22807, USA
3
Department of Mechanical Engineering, Virginia Tech, Blacksburg, VA 24061, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Delbert Tesar
Received: 14 December 2016 / Revised: 8 February 2017 / Accepted: 2 March 2017 / Published: 28 March 2017
(This article belongs to the Special Issue Active Magnetic Bearing Actuators)
View Full-Text   |   Download PDF [2570 KB, uploaded 28 March 2017]   |  

Abstract

Inherent in every Active Magnetic Bearing (AMB) are differences between the expected geometric axes and the actual magnetic axes due to a combination of discrepancies, including physical variation from manufacturing tolerances and misalignment from mechanical assembly, fringing and leakage effects, as well as variations in magnetic material properties within a single AMB. A method is presented here for locating the magnetic axes of an AMB that will facilitate the accurate characterization of the bearing air gaps for potential improvement in field tuning, performance analyses and certain shaft force measurement techniques. This paper presents an extension of the application of the bias current perturbation method for the determination of the magnetic center to the determination of magnetic axes for the further development of accurate current-based force measurement techniques. View Full-Text
Keywords: magnetic bearing reaction; output current set point; error vector; empirical transformation equation; system identification magnetic bearing reaction; output current set point; error vector; empirical transformation equation; system identification
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Spangler, D.; Prins, R.; Kasarda, M. A System Identification Technique Using Bias Current Perturbation for the Determination of the Magnetic Axes of an Active Magnetic Bearing. Actuators 2017, 6, 13.

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