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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2021-04-01
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| Series: | Sensors |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1424-8220/21/9/3095 |
| _version_ | 1797535842049196032 |
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| author | Tong Feng Wenlu Chen Jinji Qiu Shuanghui Hao |
| author_facet | Tong Feng Wenlu Chen Jinji Qiu Shuanghui Hao |
| author_sort | Tong Feng |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-03-10T11:51:03Z |
| format | Article |
| id | doaj.art-5e096d02d8a340c7b09f9f78973bfe4c |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T11:51:03Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-5e096d02d8a340c7b09f9f78973bfe4c2023-11-21T17:43:37ZengMDPI AGSensors1424-82202021-04-01219309510.3390/s21093095A New Kind of Absolute Magnetic EncoderTong Feng0Wenlu Chen1Jinji Qiu2Shuanghui Hao3School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, ChinaTo 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.https://www.mdpi.com/1424-8220/21/9/3095absolute angular displacement sensorHall-effect sensorcombined magnetic encodermulti-pole alnico magnet |
| spellingShingle | Tong Feng Wenlu Chen Jinji Qiu Shuanghui Hao A New Kind of Absolute Magnetic Encoder Sensors absolute angular displacement sensor Hall-effect sensor combined magnetic encoder multi-pole alnico magnet |
| 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 | absolute angular displacement sensor Hall-effect sensor combined magnetic encoder multi-pole alnico magnet |
| url | https://www.mdpi.com/1424-8220/21/9/3095 |
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