DocumentCode :
3566484
Title :
Position error compensation in quadrature analog magnetic encoders through an iterative optimization algorithm
Author :
Lara, Jorge ; Chandra, Ambrish
Author_Institution :
Ecole de Technol. Super., Univ. of Quebec, Montréal, QC, Canada
fYear :
2014
Firstpage :
3043
Lastpage :
3048
Abstract :
This paper analyses the position error compensation in quadrature analog magnetic encoders through the iterative linear search optimization algorithm of "steepest descent". In current literature, the sine/cosine signals from the encoder are compensated considering only the gain mismatch, the DC offset components and the non-orthogonality. Nevertheless, the magnetic field distortion due to the non-homogeneity of the magnet and the distortion of the signals due to the mechanical misalignment between the rotation axis of the motor shaft, the magnet center and the chip sensor are generally neglected. In this work, all of these factors are taken into account. The results show that a higher order approximation for modeling the harmonic distortion contained in the encoder signals leads to a slight biasing in the convergence of the compensating parameters. However, the unconstrained and multivariate optimization algorithm of steepest descent fairly minimizes the error from the objective function F(xn) allowing achieve a compensation efficiency of up to 66%, thus increasing the overall accuracy of this kind of magnetic encoders and improving the performance of any application where they provide rotary position feedback.
Keywords :
compensation; encoding; harmonic distortion; iterative methods; optimisation; position measurement; shafts; DC offset components; chip sensor; gain mismatch; harmonic distortion; iterative linear search optimization algorithm; magnet center; magnetic field distortion; mechanical misalignment; motor shaft; position error compensation; quadrature analog magnetic encoders; rotation axis; Algorithm design and analysis; Approximation methods; Convergence; Harmonic analysis; Harmonic distortion; Linear programming; Optimization; harmonic distortion; iterative optimization algorithm; optimal convergence; position error compensation; quadrature analog encoders;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Electronics Society, IECON 2014 - 40th Annual Conference of the IEEE
Type :
conf
DOI :
10.1109/IECON.2014.7048943
Filename :
7048943
Link To Document :
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