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Sensors 2018, 18(7), 2281;

Lagging-Domain Model for Compensation of Hysteresis of xMR Sensors in Positioning Applications

RLS Merilna tehnika d.o.o., Pod vrbami 2, 1218 Komenda, Slovenia
Laboratory for Bioelectromagnetics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, 1000 Ljubljana, Slovenia
Author to whom correspondence should be addressed.
Received: 1 June 2018 / Revised: 29 June 2018 / Accepted: 12 July 2018 / Published: 14 July 2018
(This article belongs to the Special Issue Magnetic Sensors)
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The hysteresis of magnetoresistive sensors remains a considerable cause of inaccuracy of positioning applications. The phenomena itself has been well studied and described by different physical and phenomenological models. Various biasing techniques have been proposed. However, the increased fabrication and computational price they require is undesirable. In this paper, a computational algorithm for the compensation of hysteresis of linear and rotary encoders is proposed. A lagging-domain model based on play operators is presented for prediction of hysteresis. The outlined procedure for the calibration of parameters allows the use of the algorithm for various types of encoders without knowing their exact material properties. The method was tested on different anisotropic magnetoresistive and tunneling magnetoresistive sensors. Results show that the impact of hysteresis was reduced by up to 90% without a significant increase of computational time or production costs. View Full-Text
Keywords: hysteresis; magnetoresistive sensors; compensation; play operator hysteresis; magnetoresistive sensors; compensation; play operator

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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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Domajnko, D.; Križaj, D. Lagging-Domain Model for Compensation of Hysteresis of xMR Sensors in Positioning Applications. Sensors 2018, 18, 2281.

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