Sensing Mechanism of a Rotary Magnetic Encoder Based on Time Grating

This paper presents a sensing mechanism of a rotary magnetic encoder based on the time grating approach. The relationship between spatial displacement and time standard is built by the orthogonal alternating magnetic field in the rotational motion. Time pulses serve as measurement standard and are c...

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Bibliographic Details
Published inIEEE sensors journal Vol. 18; no. 9; pp. 3677 - 3683
Main Authors Wang, Shuxian, Wu, Zhiyi, Peng, Donglin, Chen, Sheng, Zhang, Zhun, Liu, Shiyou
Format Journal Article
LanguageEnglish
Published IEEE 01.05.2018
Subjects
Magnetic encoder
Magnetic field measurement
Magnetic fields
magnetic ring
Magnetic sensors
Magnetic tunneling
Shafts
time grating
tunnel magnetoresistance
Tunneling magnetoresistance
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Summary:This paper presents a sensing mechanism of a rotary magnetic encoder based on the time grating approach. The relationship between spatial displacement and time standard is built by the orthogonal alternating magnetic field in the rotational motion. Time pulses serve as measurement standard and are counted to measure the angular displacement. Therefore, this displacement detection method is called time grating. The alternating magnetic field is generated using the magnetic ring rotating with the shaft. Pairs of tunnel magneto resistance sensors are separated by 90° electrically angles to induce the alternating magnetic field and output orthogonal voltage signals. The travelling wave would be generated by signal processing, which has the phase shift with the rotating shaft. Thus, the rotation angle is measured by counting the time pluses corresponding to the phase difference. A rotary magnetic encoder has been fabricated to evaluate the proposed method. Experimental results indicate that the measurement has high resolution and stability.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2018.2810874