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Off-Center Error Correction of AMR Yokeless Current Transducer
Joint Authors
Source
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-10-17
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Abstract EN
We present a method of calibration and error correction of the AMR yokeless current transducer consisting of a circular array of eight anisotropic magnetoresistors (AMR) with one feedback compensation loop.
The main sources of errors are the nonidentical parameters of AMR sensors and off-center position of the measured current.
It is well known that AMR sensors from the same batch have 2% spread of the sensitivity; we found that the variation of the factor of the internal compensation coil is the same.
We developed a novel calibration process using the readings of individual residual uncompensated voltages of the AMRs.
The position of the current inside the measurement hole is estimated from the individual voltages considering the influence of external DC magnetic field such as the Earth’s field.
During the calibration phase, the sensor outputs are measured for several positions of the current conductor inside the measuring hole.
As a result of calibration the lookup table of error corrections is calculated and stored in the memory, and then these values are used for the correction during the measurement of the unknown current.
This procedure reduces the off-center error from 0.4% to 0.06%.
American Psychological Association (APA)
Mlejnek, Pavel& Ripka, Pavel. 2017. Off-Center Error Correction of AMR Yokeless Current Transducer. Journal of Sensors،Vol. 2017, no. 2017, pp.1-7.
https://search.emarefa.net/detail/BIM-1187131
Modern Language Association (MLA)
Mlejnek, Pavel& Ripka, Pavel. Off-Center Error Correction of AMR Yokeless Current Transducer. Journal of Sensors No. 2017 (2017), pp.1-7.
https://search.emarefa.net/detail/BIM-1187131
American Medical Association (AMA)
Mlejnek, Pavel& Ripka, Pavel. Off-Center Error Correction of AMR Yokeless Current Transducer. Journal of Sensors. 2017. Vol. 2017, no. 2017, pp.1-7.
https://search.emarefa.net/detail/BIM-1187131
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1187131