Research on the Electromechanical Conversion Efficiency for Giant Magnetostrictive Ultrasonic Machining System

doi:10.3901/JME.2017.19.052

Abstract

Abstract: In order to improve the efficiency and capability of ultrasonic machining system, the design method of Giant magnetostrictive ultrasonic machining systems (GMUMS) is presented and the influence of magnetic material for the closed magnetic circuit on the vibration performance is studied. Three kinds of magnetic materials, including silicon steel, ferrite and magnetic powder core, are applied and the equivalent circuit is proposed. Based on impedance analysis method, the impedance circle is plotted to determine the resonant frequency and electromechanical conversion coefficient so that the rule of magnetic material properties and electromechanical conversion coefficient can be put forward. To verify the impedance analysis results, the relation of amplitude-current sensitivity and excitation frequency under four excitation voltage levels is established and the optimization selection method of the magnetic material for different power-capability ultrasonic system is proposed. The results reveal that a low-power GMUMS can generate a higher electromechanical conversion coefficient by using high permeability ferrite material, while the magnetic powder core with higher saturation magnetic flux density is well-suited for high-power GMUMS due to the influence of both the permeability and saturation magnetic flux density on the vibration performance. It is useful in choosing magnetic materials for the GMUMS with different levels of power.

Key words: electromechanical conversion coefficient, giant magnetostrictive material, magnetic circuit optimization, ultrasonic vibration system

CLC Number:

TG663

CAI Wanchong, ZHANG Jianfu, YU Dingwen, WU Zhijun, FENG Pingfa. Research on the Electromechanical Conversion Efficiency for Giant Magnetostrictive Ultrasonic Machining System[J]. Journal of Mechanical Engineering, 2017, 53(19): 52-58.

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