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| Study on Piezomagnetic Effect of Galfenol Alloy and Force Sensor |
| Li Yunkai1,2, Wang Bowen1,2, Zhang Bing1,2 |
1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300130 China;
2. Key Laboratory of Electromagnetic Field and Electrical Apparatus Reliability of Hebei Province Hebei University of Technology Tianjin 300130 China |
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Abstract Based on the nonlinear piezomagnetic equation, the piezomagnetic effect of flake Galfenol alloy was analyzed by COMSOL finite element simulation platform. According to the simulation results, the variation of dynamic piezomagnetic coefficient of Galfenol alloy under different bias magnetic fields and stress was studied. According to the characteristics of cantilever beam, a novel magnetostrictive force sensor was designed and fabricated by using Galfenol alloy. Based on the electromagnetism theory and piezomagnetic effect, the measurement model of force sensor was established. The experimental platform of magnetostrictive force sensor was built, and the influence of bias magnetic field and force on output characteristics was experimentally studied. The simulation and experimental results show that when the bias magnetic field is 4.5 kA/m, the piezomagnetic coefficient reaches the maximum value of 17.5 T/GPa. The measuring range of the sensor is 0~4 N, and it possesses a high sensitivity in the range of 0~2 N. The sensor has the advantages of simple structure and high sensitivity, and can meet the requirement of accurate force perception.
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Received: 24 May 2018
Published: 20 September 2019
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2019, Vol. 34 
