Preprint Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 14 March 2017 / Approved: 15 March 2017 / Online: 15 March 2017 (07:57:38 CET)

How to cite: Spangler Jr., 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. Preprints 2017, 2017030096 (doi: 10.20944/preprints201703.0096.v1). Spangler Jr., 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. Preprints 2017, 2017030096 (doi: 10.20944/preprints201703.0096.v1).

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 [4] to the determination of magnetic axes for the further development of accurate current-based force measurement techniques [1].

Subject Areas

magnetic bearing reaction; output current set point; error vector; empirical transformation equation; system identification

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