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Sensors 2016, 16(10), 1650; doi:10.3390/s16101650

A Steel Wire Stress Measuring Sensor Based on the Static Magnetization by Permanent Magnets

School of Mechanical Science & Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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Received: 25 July 2016 / Accepted: 30 September 2016 / Published: 6 October 2016
(This article belongs to the Section Physical Sensors)
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Abstract

A new stress measuring sensor is proposed to evaluate the axial stress in steel wires. Without using excitation and induction coils, the sensor mainly consists of a static magnetization unit made of permanent magnets and a magnetic field measurement unit containing Hall element arrays. Firstly, the principle is illustrated in detail. Under the excitation of the magnetization unit, a spatially varying magnetized region in the steel wire is utilized as the measurement region. Radial and axial magnetic flux densities at different lift-offs in this region are measured by the measurement unit to calculate the differential permeability curve and magnetization curve. Feature parameters extracted from the curves are used to evaluate the axial stress. Secondly, the special stress sensor for Φ5 and Φ7 steel wires is developed accordingly. At last, the performance of the sensor is tested experimentally. Experimental results show that the sensor can measure the magnetization curve accurately with the error in the range of ±6%. Furthermore, the obtained differential permeability at working points 1200 A/m and 10000 A/m change almost linearly with the stress in steel wires, the goodness of linear fits are all higher than 0.987. Thus, the proposed steel wire stress measuring sensor is feasible. View Full-Text
Keywords: stress evaluation; steel wire; static magnetization; permanent magnet; Hall element arrays stress evaluation; steel wire; static magnetization; permanent magnet; Hall element arrays
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Deng, D.; Wu, X.; Zuo, S. A Steel Wire Stress Measuring Sensor Based on the Static Magnetization by Permanent Magnets. Sensors 2016, 16, 1650.

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