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A New Kind of Absolute Magnetic Encoder

To fulfill the requirement of fields such as robotics, aviation, and special machining, motors with quill shafts or outer rotors have been used. For these special motors, the photoelectric encoder’s volume is normally too big and easy to be polluted by oil or dust; magnetic encoder normally has poor...

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Detalles Bibliográficos
Autores principales: Feng, Tong, Chen, Wenlu, Qiu, Jinji, Hao, Shuanghui
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8125040/
https://www.ncbi.nlm.nih.gov/pubmed/33946761
http://dx.doi.org/10.3390/s21093095
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author Feng, Tong
Chen, Wenlu
Qiu, Jinji
Hao, Shuanghui
author_facet Feng, Tong
Chen, Wenlu
Qiu, Jinji
Hao, Shuanghui
author_sort Feng, Tong
collection PubMed
description To fulfill the requirement of fields such as robotics, aviation, and special machining, motors with quill shafts or outer rotors have been used. For these special motors, the photoelectric encoder’s volume is normally too big and easy to be polluted by oil or dust; magnetic encoder normally has poor accuracy, and alnico piece may not provide enough magnetic field coverage area. The aim of this essay is to find a new structure of magnetic encoder to improve the precision and magnetic field coverage area. By using two multi-pole alnico rings with a different number of pole pairs to provide a magnetic field, the coverage area could be improved. The position differences between two alnicos pole positions are used to calculate absolute angle value, so the accuracy of the encoder could be absolute and no less than that of a combined magnetic encoder with the same number of pole pairs. A special algorithm is proposed for decoding. This new kind of magnetic encoder could be used on special motors with quill shafts or outer rotors. Its volume and weight are less than the photoelectric encoder and have better performance on antipollution. The alnico ring is easy to modify to suit the structure of the motor.
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spelling pubmed-81250402021-05-17 A New Kind of Absolute Magnetic Encoder Feng, Tong Chen, Wenlu Qiu, Jinji Hao, Shuanghui Sensors (Basel) Communication To fulfill the requirement of fields such as robotics, aviation, and special machining, motors with quill shafts or outer rotors have been used. For these special motors, the photoelectric encoder’s volume is normally too big and easy to be polluted by oil or dust; magnetic encoder normally has poor accuracy, and alnico piece may not provide enough magnetic field coverage area. The aim of this essay is to find a new structure of magnetic encoder to improve the precision and magnetic field coverage area. By using two multi-pole alnico rings with a different number of pole pairs to provide a magnetic field, the coverage area could be improved. The position differences between two alnicos pole positions are used to calculate absolute angle value, so the accuracy of the encoder could be absolute and no less than that of a combined magnetic encoder with the same number of pole pairs. A special algorithm is proposed for decoding. This new kind of magnetic encoder could be used on special motors with quill shafts or outer rotors. Its volume and weight are less than the photoelectric encoder and have better performance on antipollution. The alnico ring is easy to modify to suit the structure of the motor. MDPI 2021-04-29 /pmc/articles/PMC8125040/ /pubmed/33946761 http://dx.doi.org/10.3390/s21093095 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Communication
Feng, Tong
Chen, Wenlu
Qiu, Jinji
Hao, Shuanghui
A New Kind of Absolute Magnetic Encoder
title A New Kind of Absolute Magnetic Encoder
title_full A New Kind of Absolute Magnetic Encoder
title_fullStr A New Kind of Absolute Magnetic Encoder
title_full_unstemmed A New Kind of Absolute Magnetic Encoder
title_short A New Kind of Absolute Magnetic Encoder
title_sort new kind of absolute magnetic encoder
topic Communication
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8125040/
https://www.ncbi.nlm.nih.gov/pubmed/33946761
http://dx.doi.org/10.3390/s21093095
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