| Citation: | LIU Qiang, LI Pengyang, XU Guangyao, et al. Optimal design for magnetic circuit in giant magnetostrictive ultrasonic transducer[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(8): 1639-1645. doi: 10.13700/j.bh.1001-5965.2018.0737(in Chinese)
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In order to improve the magnetic circuit environment and minimize the heating of the giant magnetostrictive ultrasonic transducer, the magnetic path gap was taken as the research object, and the relationships between the magnetic path gap and the magnetic field strength of the giant magnetostrictive material (GMM) rod were analyzed by Maxwell finite element software. The impedance and amplitude of the ultrasonic transducer and the temperature of the GMM rod were measured by experiments. Experimental results show that the magnetic field strength and magnetic field uniformity of the GMM rod decrease with the increase of the magnetic path gap. As the slot width of the magnetically permeable cylinder increases, the resonant frequency of the ultrasonic transducer is basically the same, the temperature of the GMM rod is reduced; When the slot width of the magnetic cylinder is about 6 mm, the magnetic field uniformity of the GMM rod is the highest and the mechanical quality factor is the largest, which is of great significance for the optimal design of the giant magnetostrictive ultrasonic transducer.
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